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Third Party Libpng

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Third Party Libpng
提交 520a764c 编写于 作者: G Glenn Randers-Pehrson
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Imported from libpng-1.0.6.tar

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ANNOUNCE
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Libpng 1.0.5s - February 18, 2000
Libpng 1.0.6 - March 21, 2000
This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.
This is a public release of libpng, intended for use in production codes.
Changes since the last public release (1.0.5):
version libpng-1.0.5a October 23, 1999
Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)
Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)
Further optimization and bugfix of pngvcrd.c
Revised pngset.c so that it does not allocate or free memory in the user's
text_ptr structure. Instead, it makes its own copy.
Created separate write_end_info_struct in pngtest.c for a more severe test.
Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
version libpng-1.0.5b November 23, 1999
Created separate write_end_info_struct in pngtest.c for a more severe test.
Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and
PNG_FLAG_WROTE_tIME from flags to mode.
Added png_write_info_before_PLTE() function.
Fixed some typecasting in contrib/gregbook/*.c
Updated scripts/makevms.com and added makevms.com to contrib/gregbook
and contrib/pngminus (Martin Zinser)
version libpng-1.0.5c November 26, 1999
Updated scripts/makevms.com (Martin Zinser)
Moved png_get_header_version from png.h to png.c, to accomodate ansi2knr.
Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
accomodate making DLL's: Moved usr_png_ver from global variable to function
png_get_header_ver() in png.c. Moved png_sig to png_sig_bytes in png.c and
eliminated use of png_sig in pngwutil.c. Moved the various png_CHNK arrays
into pngtypes.h. Eliminated use of global png_pass arrays. Declared the
into local arrays. Eliminated use of global png_pass arrays. Declared the
png_CHNK and png_pass arrays to be "const". Made the global arrays
available to applications (although none are used in libpng itself) when
PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.
Removed some extraneous "-I" from contrib/pngminus/makefile.std
available to applications when PNG_NO_GLOBAL_ARRAYS is not defined or
when PNG_USE_GLOBAL_ARRAYS is defined. Made available to applications a
macro "PNG_USE_LOCAL_ARRAYS".
Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3
version libpng-1.0.5d November 29, 1999
Add type cast (png_const_charp) two places in png.c
Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
to applications a macro "PNG_USE_LOCAL_ARRAYS".
#ifdef out all the new declarations when PNG_USE_GLOBAL_ARRAYS is defined.
Added PNG_EXPORT_VAR macro to accommodate making DLL's.
version libpng-1.0.5e November 30, 1999
Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
structure; refactored the inflate/deflate support to make adding new chunks
with trailing compressed parts easier in the future, and added new functions
png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
NOTE: Applications that write text chunks MUST define png_text->lang. Before
calling png_set_text(). It must be set to NULL if you want to write tEXt or
zTXt chunks. If you want your application to be able to run with older
versions of libpng, use
#ifdef PNG_iTXt_SUPPORTED
png_text[i].lang = NULL;
#endif
Refactored the inflate/deflate support to make adding new chunks with
trailing compressed parts easier in the future (Eric S. Raymond).
Added iCCP, iTXt, sCAL, and sPLT support; added "lang", "lang_key", and
itxt_length" members to the png_text structure (Eric S. Raymond, Glenn R-P)
Changed png_get_oFFs() and png_set_oFFs() to use signed rather than unsigned
offsets (Eric S. Raymond).
Combined PNG_READ_cHNK_SUPPORTED and PNG_WRITE_cHNK_SUPPORTED macros into
PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED
macros, leaving the separate macros also available.
Removed comments on #endifs at the end of many short, non-nested #if-blocks.
version libpng-1.0.5f December 6, 1999
Changed makefile.solaris to issue a warning about potential problems when
the ucb "ld" is in the path ahead of the ccs "ld".
Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.
Added sCAL chunk support (Eric S. Raymond).
version libpng-1.0.5g December 7, 1999
Fixed "png_free_spallettes" typo in png.h
Added code to handle new chunks in pngpread.c
Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
Added "translated_key" to png_text structure and png_write_iTXt().
Added code in pngwrite.c to work around a newly discovered zlib bug.
version libpng-1.0.5h December 10, 1999
NOTE: regarding the note for version 1.0.5e, the following must also
be included in your code:
png_text[i].translated_key = NULL;
Unknown chunk handling is now supported.
Unknown chunk handling is now supported (Eric S. Raymond).
Option to eliminate all floating point support was added. Some new
fixed-point functions such as png_set_gAMA_fixed() were added.
version libpng-1.0.5i December 13, 1999
Added some type casts to silence compiler warnings.
Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
Removed leading blanks from a #define in pngvcrd.c
Added some parameters to the new png_set_keep_unknown_chunks() function,
and relocated it in pngset.c
Added a test for up->location != 0 in the first instance of writing
unknown chunks in pngwrite.c
Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
prevent recursion.
Added png_free_hIST() function.
Various patches to fix bugs in the sCAL and integer cHRM processing,
and to add some convenience macros for use with sCAL.
version libpng-1.0.5j December 21, 1999
Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
around buggy compilers.
Added new type "png_fixed_point" for integers that hold float*100000 values
Restored backward compatibility of tEXt/zTXt chunk processing:
Added members "lang_key" and "itxt_length" to png_text struct. Set
text_length=0 when "text" contains iTXt data. Use the "compression"
member to distinguish among tEXt/zTXt/iTXt types. Restored the first
four members of png_text to the same order as v.1.0.5d. The "Note" above,
about backward incompatibility of libpng-1.0.5e, no longer applies.
Added PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.
Fixed png_read|write_iTXt() to read|write parameters in the right order.
and to write the iTXt chunk after IDAT if it appears in the end_ptr.
Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
Reversed the order of trying to write floating-point and fixed-point gAMA.
version libpng-1.0.5k December 27, 1999
Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
Added png_handle_as_unknown()
Added png_free_chunk_list() function and chunk_list and num_chunk_list members
of png_ptr.
Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
Added chunk_list and num_chunk_list members of png_ptr.
Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
version libpng-1.0.5l January 1, 2000
Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
for setting a callback function to handle unknown chunks and for
retrieving the associated user pointer (Glenn).
version 1.0.5m [January 7, 2000]
Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
version 1.0.5n [January 9, 2000]
Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
own memory for info_ptr->palette. This makes it safe for the calling
application to free its copy of the palette any time after it calls
png_set_PLTE().
version 1.0.5o [January 20, 2000]
Cosmetic changes only (removed some trailing blanks and TABs)
version 1.0.5p [January 31, 2000]
Added png_free_data() function.
Added high-level functions png_read_png() and png_write_png() (ESR).
Renamed pngdll.mak to makefile.bd32
Cosmetic changes in pngtest.c
version 1.0.5q [February 5, 2000]
Relocated the makefile.solaris warning about PATH problems.
Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
Revised makefile.gcmmx
Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros
version 1.0.5r [February 7, 2000]
Removed superfluous prototype for png_get_itxt from png.h
Fixed a bug in pngrtran.c that improperly expanded the background color.
Return *num_text=0 from png_get_text() when appropriate, and fix documentation
of png_get_text() in libpng.txt/libpng.3.
version 1.0.5s [February 18, 2000]
Added "png_jmpbuf()" macro to pngconf.h, to help people migrate to the
new error handler that's planned for the next libpng release, and changed
example.c, pngtest.c, and contrib programs to use this macro.
Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() and
"png_jmpbuf()" macros to pngconf.h, to help people migrate to the new error
handler that's planned for the next libpng release, and changed example.c,
pngtest.c, and contrib programs to use this macro.
Revised some of the DLL-export macros in pngconf.h (Greg Roelofs)
Fixed a bug in png_read_png() that caused it to fail to expand some images
that it should have expanded.
Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions
in pngget.c
Changed the allocation of palette, history, and trans arrays back to
the version 1.0.5 method (linking instead of copying) which restores
backward compatibility with version 1.0.5. Added some remarks about
that in example.c
Updated makefile.linux and makefile.gccmmx to make directories conditionally.
Made cosmetic changes to pngasmrd.h
Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
Modified png_read_png() to allocate info_ptr->row_pointers only if it
hasn't already been allocated.
Increased precision of rgb_to_gray calculations from 8 to 15 bits and
added png_set_rgb_to_gray_fixed() function.
Added makefile.bc32 (32-bit Borland C++, C mode)
Updated references to the zlib home page, which has moved to freesoftware.com.
Corrected bugs in documentation regarding png_read_row() and png_write_row().
Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
Added makefile.sggcc (SGI IRIX with gcc)
Send comments/corrections/commendations to
png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
......
CHANGES
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......@@ -628,9 +628,35 @@ version 1.0.5s [February 18, 2000]
Changed the allocation of palette, history, and trans arrays back to
the version 1.0.5 method (linking instead of copying) which restores
backward compatibility with version 1.0.5. Added some remarks about
that in example.c. Added "free_me" member to info_ptr and png_ptr.
that in example.c. Added "free_me" member to info_ptr and png_ptr
and added png_free_data() function.
Updated makefile.linux and makefile.gccmmx to make directories conditionally.
Made cosmetic changes to pngasmrd.h
Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
Modified png_read_png() to allocate info_ptr->row_pointers only if it
hasn't already been allocated.
version 1.0.5t [March 4, 2000]
Changed png_jmp_env() migration aiding macro to png_jmpbuf().
Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c
Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when
PNG_FLAG_HAVE_CHUNK_HEADER was moved into png_ptr->mode in version 1.0.5b
Files in contrib/gregbook were revised to use png_jmpbuf() and to select
a 24-bit visual if one is available, and to allow abbreviated options.
Files in contrib/pngminus were revised to use the png_jmpbuf() macro.
Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s
version 1.0.5u [March 5, 2000]
Simplified the code that detects old png.h in png.c and pngtest.c
Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)
Increased precision of rgb_to_gray calculations from 8 to 15 bits and
added png_set_rgb_to_gray_fixed() function.
Added makefile.bc32 (32-bit Borland C++, C mode)
version 1.0.5v [March 11, 2000]
Added some parentheses to the png_jmpbuf macro definition.
Updated references to the zlib home page, which has moved to freesoftware.com.
Corrected bugs in documentation regarding png_read_row() and png_write_row().
Updated documentation of png_rgb_to_gray calculations in libpng.3/libpng.txt.
Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
version 1.0.6 [March 21, 2000]
Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
Added makefile.sggcc (SGI IRIX with gcc)
INSTALL
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Installing libpng version 1.0.5s - February 18, 2000
Installing libpng version 1.0.6 - March 21, 2000
Before installing libpng, you must first install zlib. zlib
can usually be found wherever you got libpng. zlib can be
......@@ -10,7 +10,7 @@ zlib.h and zconf.h include files that correspond to the
version of zlib that's installed.
You can rename the directories that you downloaded (they
might be called "libpng-1.0.5s" or "lpng103" and "zlib-1.1.3"
might be called "libpng-1.0.6" or "lpng106" and "zlib-1.1.3"
or "zlib113") so that you have directories called "zlib" and "libpng".
Your directory structure should look like this:
......@@ -40,25 +40,27 @@ If the line endings in the files look funny, you may wish to get the other
distribution of libpng. It is available in both tar.gz (UNIX style line
endings) and zip (DOS style line endings) formats.
First enter the zlib directory and follow the instructions
in zlib/README. Then come back here and choose the
appropriate makefile.sys in the scripts directory.
First enter the zlib directory and follow the instructions in zlib/README.
Then come back here and choose the appropriate makefile.sys in the scripts
directory.
The files that are presently available in the scripts directory
include
descrip.mms => VMS makefile for MMS or MMK
makefile.std => Generic UNIX makefile
makefile.std => Generic UNIX makefile (cc, creates static libpng.a)
makefile.linux => Linux/ELF makefile (gcc, creates libpng.so.2.1.0.6)
makefile.gcmmx => Linux/ELF makefile (gcc, creates libpng.so.2.1.0.6,
uses assembler code tuned for Intel MMX platform)
makefile.gcc => Generic makefile (gcc, creates static libpng.a)
makefile.knr => Archaic UNIX Makefile that converts files with
ansi2knr (Requires ansi2knr.c from
ftp://ftp.cs.wisc.edu/ghost)
makefile.dec => DEC Alpha UNIX makefile
makefile.hpux => HPUX (10.20 and 11.00) makefile
makefile.sgi => Silicon Graphics IRIX makefile
makefile.ibmvac3 => IBM VisualAge/C++ version 3.x for Win32 and OS/2 (static)
makefile.sgi => Silicon Graphics IRIX makefile (cc, creates static lib)
makefile.sggcc => Silicon Graphics (gcc, creates libpng.so.2.1.0.6)
makefile.sunos => Sun makefile
makefile.solaris => Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.5s)
makefile.linux => Linux/ELF makefile (gcc, creates libpng.so.2.1.0.5s)
makefile.gcmmx => Linux/ELF makefile (gcc, creates libpng.so.2.1.0.5s,
uses assembler code tuned for Intel MMX platform)
makefile.solaris => Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.6)
makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc
makefile.mips => MIPS makefile
makefile.acorn => Acorn makefile
......@@ -67,10 +69,10 @@ include
(Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)
makefile.atari => Atari makefile
makefile.beos => BEOS makefile for X86
makefile.borland => Borland makefile (uses bcc)
makefile.bor => Borland makefile (uses bcc)
makefile.bc32 => 32-bit Borland C++ (all modules compiled in C mode)
makefile.bd32 => To make a png32bd.dll with Borland C++ 4.5
makefile.turboc3 => Turbo C 3.0 makefile
build.bat => MS-DOS batch file for Borland compiler
makefile.tc3 => Turbo C 3.0 makefile
makefile.dj2 => DJGPP 2 makefile
makefile.msc => Microsoft C makefile
makefile.vcawin32 => makefile for Microsoft Visual C++ 5.0 and later (uses
......@@ -81,6 +83,7 @@ include
pngos2.def => OS/2 module definition file used by makefile.os2
makefile.watcom => Watcom 10a+ Makefile, 32-bit flat memory model
makevms.com => VMS build script
descrip.mms => VMS makefile for MMS or MMK
pngdef.pas => Defines for a png32bd.dll with Borland C++ 4.5
SCOPTIONS.ppc => Used with smakefile.ppc
......
KNOWNBUG
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Known bugs and suggested enhancements in libpng-1.0.5
Known bugs and suggested enhancements in libpng-1.0.6
1. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
......@@ -41,43 +41,3 @@ Known bugs and suggested enhancements in libpng-1.0.5
Much of this was completed in libpng-1.0.5h, but gamma compensation
is not yet done in fixed-point arithmetic.
4. October 1999 -- BUG
pngvcrd.c is failing for interlaced PNGs that have empty passes.
STATUS: A check for "width != 0" is required in several places.
Fixed in libpng-1.0.5a/1.1.0
5. October 1999 -- BUG
Under MSVC++6.0 with debugging enabled, heap corruption was detected
while destroying the png_write_ptr.
STATUS: This was fixed by modifying png_set_text (in pngset.c) to
refrain from writing into the user's text_ptr. With this fix, however,
pngwrite.c, while destroying the info_ptr, was failing to free the
text->key strings. Fix for the latter problem is to duplicate code
from png.c.
Fixed in libpng-1.0.5a/1.1.0
6. December 1999 -- new BUG
The png_text structure was modified in libpng-1.0.5e in a manner that
is not backward compatible (the lang member was added, and the
translated_key member was added to libpng-1.0.5g)
STATUS: Fixed in libpng-1.0.5j/1.1.0
7. December 1999 -- BUG
The new pnggccrd.c has syntax errors when compiled with gcc.
STATUS: Under investigation.
8. February 2000 -- BUG
When an RGBA file is expanded, only 24 or 48 bits per pixel are reserved
in rowbytes.
STATUS: Fixed in libpng-1.0.5s
LICENSE
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......@@ -5,7 +5,7 @@ Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
Copyright (c) 1996, 1997 Andreas Dilger
(libpng versions 0.90, December 1996, through 0.96, May 1997)
Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
(libpng versions 0.97, January 1998, through 1.0.5s, February 18, 2000)
(libpng versions 0.97, January 1998, through 1.0.6, March 21, 2000)
For the purposes of this copyright and license, "Contributing Authors"
is defined as the following set of individuals:
......@@ -68,4 +68,4 @@ certification mark of the Open Source Initiative.
Glenn Randers-Pehrson
randeg@alum.rpi.edu
February 18, 2000
March 21, 2000
README
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README for libpng 1.0.5s - February 18, 2000 (shared library 2.1)
README for libpng 1.0.6 - March 21, 2000 (shared library 2.1)
See the note about version numbers near the top of png.h
See INSTALL for instructions on how to install libpng.
......@@ -129,22 +129,26 @@ gladly listen. Even if your suggestion is not used for version
Files in this distribution:
ANNOUNCE => Announcement of this version, with recent changes
CHANGES => Description of changes between libpng versions
KNOWNBUG => List of known bugs and deficiencies
LICENSE => License to use and redistribute libpng
README => This file
TODO => Things not implemented in the current library
build.bat => MS-DOS batch file for Borland compiler
descrip.mms => VMS project file
Y2KINFO => Statement of Y2K compliance
example.c => Example code for using libpng functions
libpng.3 => manual page for libpng
libpng.3 => manual page for libpng (includes libpng.txt)
libpng.txt => Description of libpng and its functions
libpngpf.3 => manual page for libpng's private functions
png.5 => manual page for the PNG format
png.c => Basic interface functions common to library
png.h => Library function and interface declarations
pngconf.h => System specific library configuration
pngasmrd.h => Header file for assembler-coded functions
pngerror.c => Error/warning message I/O functions
pngget.c => Functions for retrieving info from struct
pngmem.c => Memory handling functions
pngnow.png => PNG logo
pngpread.c => Progressive reading functions
pngread.c => Read data/helper high-level functions
pngrio.c => Lowest-level data read I/O functions
......@@ -166,21 +170,24 @@ Files in this distribution:
pngsuite => Test images
scripts => Directory containing scripts for building libpng:
descrip.mms => VMS makefile for MMS or MMK
makefile.std => Generic UNIX makefile
makefile.std => Generic UNIX makefile (cc, creates static libpng.a)
makefile.linux => Linux/ELF makefile
(gcc, creates libpng.so.2.1.0.6)
makefile.gcmmx => Linux/ELF makefile (gcc, creates
libpng.so.2.1.0.6, uses assembler code
tuned for Intel MMX platform)
makefile.gcc => Generic makefile (gcc, creates static libpng.a)
makefile.knr => Archaic UNIX Makefile that converts files with
ansi2knr (Requires ansi2knr.c from
ftp://ftp.cs.wisc.edu/ghost)
makefile.dec => DEC Alpha UNIX makefile
makefile.hpux => HPUX (10.20 and 11.00) makefile
makefile.sgi => Silicon Graphics IRIX makefile
makefile.ibmvac3 => IBM VisualAge/C++ ver 3.x for Win32, OS/2 (static)
makefile.sgi => Silicon Graphics IRIX (cc, creates static lib)
makefile.sggcc => Silicon Graphics (gcc, creates libpng.so.2.1.0.6)
makefile.sunos => Sun makefile
makefile.solaris => Solaris 2.X makefile
(gcc, creates libpng.so.2.1.0.5s)
makefile.linux => Linux/ELF makefile
(gcc, creates libpng.so.2.1.0.5s)
makefile.gcmmx => Linux/ELF makefile (gcc, creates
libpng.so.2.1.0.5s, uses assembler code
tuned for Intel MMX platform)
(gcc, creates libpng.so.2.1.0.6)
makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc
makefile.mips => MIPS makefile
makefile.acorn => Acorn makefile
......@@ -190,10 +197,10 @@ Files in this distribution:
scripts/SCOPTIONS.ppc)
makefile.atari => Atari makefile
makefile.beos => BEOS makefile for X86
makefile.borland => Borland makefile (uses bcc)
makefile.bor => Borland makefile (uses bcc)
makefile.bc32 => 32-bit Borland C++ (all modules compiled in C mode)
makefile.bd32 => To make a png32bd.dll with Borland C++ 4.5
makefile.turboc3 => Turbo C 3.0 makefile
build.bat => MS-DOS batch file for Borland compiler
makefile.tc3 => Turbo C 3.0 makefile
makefile.dj2 => DJGPP 2 makefile
makefile.msc => Microsoft C makefile
makefile.vcawin32 => makefile for Microsoft Visual C++ 5.0 and
......
Y2KINFO
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Y2K compliance in libpng:
=========================
February 18, 2000
March 21, 2000
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.71 and
upward through 1.0.5s are Y2K compliant. It is my belief that earlier
upward through 1.0.6 are Y2K compliant. It is my belief that earlier
versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer
......
configure 0 → 100755
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echo "
There is no \"configure\" script for Libpng-1.0.6. Instead, please
copy the appropriate makefile for your system from the \"scripts\"
directory. Read the INSTALL file for more details.
"
contrib/gregbook/LICENSE 0 → 100644
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---------------------------------------------------------------------------
Copyright (c) 1998-2000 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above copyright
notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
notice, disclaimer, and this list of conditions in the documenta-
tion and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates.
---------------------------------------------------------------------------
contrib/gregbook/makefile.unx → contrib/gregbook/Makefile.unx
浏览文件 @ 520a764c
# Sample makefile for rpng-x / rpng2-x / wpng using gcc and make.
# Greg Roelofs
# Last modified: 16 February 1999
# Last modified: 28 February 2000
#
# The programs built by this makefile are described in the book,
# "PNG: The Definitive Guide," by Greg Roelofs (O'Reilly and
......@@ -9,11 +9,12 @@
#
# Invoke this makefile from a shell prompt in the usual way; for example:
#
# make -f makefile.unx
# make -f Makefile.unx
#
# This makefile assumes libpng and zlib have already been built or downloaded
# and are both installed in /usr/local/{include,lib} (as indicated by the
# PNGPATH and ZPATH macros below). Edit as appropriate.
# PNG* and Z* macros below). Edit as appropriate--choose only ONE each of
# the PNGINC, PNGLIB, ZINC and ZLIB lines.
#
# This makefile builds statically linked executables (against libpng and zlib,
# that is), but that can be changed by uncommenting the appropriate PNGLIB and
......@@ -22,30 +23,38 @@
# macros --------------------------------------------------------------------
PNGPATH = /usr/local
PNGINC = -I$(PNGPATH)/include
#PNGLIB = -L$(PNGPATH)/lib -lpng
PNGLIB = $(PNGPATH)/lib/libpng.a
ZPATH = /usr/local
ZINC = -I$(ZPATH)/include
#ZLIB = -L$(ZPATH)/lib -lz
ZLIB = $(ZPATH)/lib/libz.a
#XPATH = /usr/X11
XPATH = /usr/X11R6
XINC = -I$(XPATH)/include
XLIB = -L$(XPATH)/lib -lX11
PNGINC = -I/usr/local/include
#PNGLIB = -L/usr/local/lib -lpng # dynamically linked against libpng
PNGLIB = /usr/local/lib/libpng.a # statically linked against libpng
# or:
#PNGINC = -I../..
#PNGLIB = -L../.. -lpng
#PNGLIB = ../../libpng.a
ZINC = -I/usr/local/include
#ZLIB = -L/usr/local/lib -lz # dynamically linked against zlib
ZLIB = /usr/local/lib/libz.a # statically linked against zlib
#ZINC = -I../zlib
#ZLIB = -L../zlib -lz
#ZLIB = ../../../zlib/libz.a
#XINC = -I/usr/include/X11 # old-style, stock X distributions
#XLIB = -L/usr/lib/X11 -lX11
#XINC = -I/usr/openwin/include/X11 # Sun workstations (OpenWindows)
#XLIB = -L/usr/openwin/lib -lX11
XINC = -I/usr/X11R6/include # new X distributions (XFree86, etc.)
XLIB = -L/usr/X11R6/lib -lX11
INCS = $(PNGINC) $(ZINC) $(XINC)
RLIBS = $(PNGLIB) $(ZLIB) $(XLIB) -lm
WLIBS = $(PNGLIB) $(ZLIB) -lm
WLIBS = $(PNGLIB) $(ZLIB)
CC = gcc
LD = gcc
RM = rm -f
CFLAGS = -O -Wall $(INCS)
# [note that -Wall is a gcc-specific compilation flag ("all warnings on")]
# [note that -Wall is a gcc-specific compilation flag ("most warnings on")]
# [-ansi, -pedantic and -W can also be used]
LDFLAGS =
O = .o
E =
......
contrib/gregbook/makefile.w32 → contrib/gregbook/Makefile.w32
浏览文件 @ 520a764c
......@@ -10,14 +10,14 @@
# Invoke this makefile from a DOS prompt window via:
#
# %devstudio%\vc\bin\vcvars32.bat
# nmake -nologo -f makefile.w32
# nmake -nologo -f Makefile.w32
#
# where %devstudio% is the installation directory for MSVC / DevStudio. If
# you get "environment out of space" errors, create a desktop shortcut with
# "c:\windows\command.com /e:4096" as the program command line and set the
# working directory to this directory. Then double-click to open the new
# DOS-prompt window with a bigger environment and retry the commands above.
#
#
# This makefile assumes libpng and zlib have already been built or downloaded
# and are in subdirectories at the same level as the current subdirectory
# (as indicated by the PNGPATH and ZPATH macros below). Edit as appropriate.
......@@ -32,12 +32,12 @@
# macros --------------------------------------------------------------------
PNGPATH = ../libpng
PNGPATH = ../..
PNGINC = -I$(PNGPATH)
#PNGLIB = $(PNGPATH)/pngdll.lib
PNGLIB = $(PNGPATH)/libpng.lib
ZPATH = ../zlib
ZPATH = ../../../zlib
ZINC = -I$(ZPATH)
#ZLIB = $(ZPATH)/zlibdll.lib
ZLIB = $(ZPATH)/zlibstat.lib
......
contrib/gregbook/README
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PNG: The Definitive Guide: Source Code
===========================
PNG: The Definitive Guide
===========================
Chapters 13, 14 and 15 of PNG: The Definitive Guide discuss three
Source Code
Chapters 13, 14 and 15 of "PNG: The Definitive Guide" discuss three free,
cross-platform demo programs that show how to use the libpng reference
library: rpng, rpng2 and wpng. rpng and rpng2 are viewers; the first is a
very simple example that that shows how a standard file-viewer might use
libpng, while the second is designed to process streaming data and shows how
a web browser might be written. wpng is a simple command-line program that
reads binary PPM files (the ``raw'' RGB subset of NetPBM) and converts them
to PNG.
The source code for all three demo programs currently compiles only under
Unix and 32-bit Windows. It has been tested with gcc 2.7.2.3 under Linux and
Solaris and with Microsoft Visual C++ 5.0 under Windows 95. Brief
instructions for compiling the programs are included at the top of the
makefiles; makefile.unx is the Unix version, and makefile.w32 is (you
guessed it!) the version for 32-bit Windows. libpng and zlib are required.
----------------------------------------------------------------------------
License
The source code to the demo programs may be used and distributed freely
(even if you didn't buy the book--but feel free to do so at any time),
subject to the terms of the following BSD-like license:
Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
Permission is granted to anyone to use this software for any
purpose, including commercial applications, and to alter it and
redistribute it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above
copyright notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above
copyright notice, disclaimer, and this list of conditions in
the documentation and/or other materials provided with the
distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive
Guide," published by O'Reilly and Associates.
----------------------------------------------------------
http://www.cdrom.com/pub/png/book/sources.html
library: rpng, rpng2 and wpng. rpng and rpng2 are viewers; the first is
a very simple example that that shows how a standard file-viewer might use
libpng, while the second is designed to process streaming data and shows
how a web browser might be written. wpng is a simple command-line program
that reads binary PGM and PPM files (the ``raw'' grayscale and RGB subsets
of PBMPLUS/NetPBM) and converts them to PNG.
The source code for all three demo programs currently compiles under
Unix, OpenVMS, and 32-bit Windows. (Special thanks to Martin Zinser,
zinser@decus.de, for making the necessary changes for OpenVMS and for
providing an appropriate build script.) Build instructions can be
found below.
Files:
README this file
README.w32 additional Windows-specific information
LICENSE terms of distribution and reuse (BSD-like)
Makefile.unx Unix makefile
Makefile.w32 Windows (MSVC) makefile
makevms.com OpenVMS build script
rpng-win.c Windows front end for the basic viewer
rpng-x.c X Window System (Unix, OpenVMS) front end
readpng.c generic back end for the basic viewer
readpng.h header file for the basic viewer
rpng2-win.c Windows front end for the progressive viewer
rpng2-x.c X front end for the progressive viewer
readpng2.c generic back end for the progressive viewer
readpng2.h header file for the progressive viewer
wpng.c generic (text) front end for the converter
writepng.c generic back end for the converter
writepng.h header file for the converter
toucan.png transparent PNG for testing (by Stefan Schneider)
Note that the programs are designed to be functional, but their primary
purpose is to demonstrate how to use libpng to add PNG support to other
programs. As such, their user interfaces are crude and definitely not
intended for everyday use.
Please see http://www.cdrom.com/pub/png/pngbook.html for further infor-
mation and links to the latest version of the source code, and Chapters
13-15 of the book for detailed discussion of the three programs.
Greg Roelofs
19 March 2000
BUILD INSTRUCTIONS
- Prerequisites:
- zlib ftp://ftp.cdrom.com/pub/infozip/zlib/zlib.html
- libpng http://www.cdrom.com/pub/png/pngcode.html
- pngbook http://www.cdrom.com/pub/png/book/sources.html
The pngbook demo programs are explicitly designed to demonstrate proper
coding techniques for using the libpng reference library. As a result,
you need to download and build both zlib (on which libpng depends) and
libpng. A common build setup is to place the zlib, libpng and pngbook
subdirectory trees ("folders") in the same parent directory. Then the
libpng build can refer to files in ../zlib (or ..\zlib or [-.zlib]),
and similarly for the pngbook build.
Note that all three packages are designed to be built from a command
line by default; those who wish to use a graphical or other integrated
development environments are on their own.
- Unix:
Unpack the latest pngbook sources (which should correspond to this
README file) into a directory and change into that directory.
Copy Makefile.unx to Makefile and edit the PNG* and Z* variables
appropriately (possibly also the X* variables if necessary).
make
There is no "install" target, so copy the three executables somewhere
in your path or run them from the current directory. All three will
print a basic usage screen when run without any command-line arguments;
see the book for more details.
- Windows:
Unpack the latest pngbook sources (which should correspond to this
README file) into a folder, open a "DOS shell" or "command prompt"
or equivalent command-line window, and cd into the folder where you
unpacked the source code.
For MSVC, set up the necessary environment variables by invoking
%devstudio%\vc\bin\vcvars32.bat
where where %devstudio% is the installation directory for MSVC /
DevStudio. If you get "environment out of space" errors under 95/98,
create a desktop shortcut with "c:\windows\command.com /e:4096" as
the program command line and set the working directory to the pngbook
directory. Then double-click to open the new DOS-prompt window with
a bigger environment and retry the commands above.
Copy Makefile.w32 to Makefile and edit the PNGPATH and ZPATH variables
appropriately (possibly also the "INC" and "LIB" variables if needed).
Note that the names of the dynamic and static libpng and zlib libraries
used in the makefile may change in later releases of the libraries.
Also note that, as of libpng version 1.0.5, MSVC DLL builds do not work.
This makefile therefore builds statically linked executables, but if
the DLL problems ever get fixed, uncommenting the appropriate PNGLIB
and ZLIB lines will build dynamically linked executables instead.
Do the build by typing
nmake
The result should be three executables: rpng-win.exe, rpng2-win.exe,
and wpng.exe. Copy them somewhere in your PATH or run them from the
current folder. Unlike the Unix versions, the two windowed programs
(rpng and rpng2) do not display a usage screen when invoked without
command-line arguments; see README.w32 for brief help or the book for
details. Note that the programs use the Unix-style "-" character to
specify options, instead of the more common DOS/Windows "/" character.
- OpenVMS:
Unpack the pngbook sources into a subdirectory and change into that
subdirectory.
Edit makevms.com appropriately, specifically the zpath and pngpath
variables.
@makevms
To run the programs, they probably first need to be set up as "foreign
symbols," with "disk" and "dir" set appropriately:
$ rpng == "$disk:[dir]rpng-x.exe"
$ rpng2 == "$disk:[dir]rpng2-x.exe"
$ wpng == "$disk:[dir]wpng.exe"
All three will print a basic usage screen when run without any command-
line arguments; see the book for more details. Note that the options
style is Unix-like, i.e., preceded by "-" rather than "/".
RUNNING THE PROGRAMS: (VERY) BRIEF INTRO
rpng is a simple PNG viewer that can display transparent PNGs with a
specified background color; for example,
rpng -bgcolor #ff0000 toucan.png
would display the image with a red background. rpng2 is a progressive
viewer that simulates a web browser in some respects; it can display
images against either a background color or a dynamically generated
background image. For example:
rpng2 -bgpat 16 toucan.png
wpng is a purely command-line image converter from binary PBMPLUS/NetPBM
format (.pgm or .ppm) to PNG; for example,
wpng -time < toucan.ppm > toucan.png
would convert the specified PPM file (using redirection) to PNG, auto-
matically setting the PNG modification-time chunk.
All options can be abbreviated to the shortest unique value; for example,
"-bgc" for -bgcolor (versus "-bgp" for -bgpat), or "-g" for -gamma.
contrib/gregbook/README.w32 0 → 100644
浏览文件 @ 520a764c
See the main README file for basic instructions on compiling and running
the programs. See http://www.cdrom.com/pub/png/pngbook.html for further
information and links to the source code, and Chapters 13-15 of the book
for detailed discussion of the three programs.
Since the two viewers, rpng and rpng2, are both designed to write infor-
mation to the console (i.e., a DOS-window command line) while displaying
the image in a graphical window--and since I haven't yet figured out how
to do that under Windows--here are the usage screens for the two programs:
rpng-win 1.02 of 19 March 2000: Simple PNG Viewer for Windows
Compiled with libpng 1.0.5; using libpng 1.0.5.
Compiled with zlib 1.1.3; using zlib 1.1.3.
Usage: rpng-win [-gamma exp] [-bgcolor bg] file.png
exp transfer-function exponent (``gamma'') of the display
system in floating-point format (e.g., ``2.2''); equal
to the product of the lookup-table exponent (varies)
and the CRT exponent (usually 2.2); must be positive
bg desired background color in 7-character hex RGB format
(e.g., ``#ff7f00'' for orange: same as HTML colors);
used with transparent images
Press Q, Esc or mouse button 1 after image is displayed to quit.
rpng2-win 1.04 of 19 March 2000: Progressive PNG Viewer for Windows
Compiled with libpng 1.0.5; using libpng 1.0.5.
Compiled with zlib 1.1.3; using zlib 1.1.3.
Usage: rpng2-win [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing] file.png
exp transfer-function exponent (``gamma'') of the display
system in floating-point format (e.g., ``2.2''); equal
to the product of the lookup-table exponent (varies)
and the CRT exponent (usually 2.2); must be positive
bg desired background color in 7-character hex RGB format
(e.g., ``#ff7f00'' for orange: same as HTML colors);
used with transparent images; overrides -bgpat
pat desired background pattern number (1-16); used with
transparent images; overrides -bgcolor
-timing enables delay for every block read, to simulate modem
download of image (~36 Kbps)
Press Q, Esc or mouse button 1 after image is displayed to quit.
The usage screen for the third (non-windowed) program, wpng, can be seen
simply by invoking it without any parameters (``wpng'').
Greg Roelofs
19 March 2000
contrib/gregbook/makevms.com
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$!------------------------------------------------------------------------------
$! make Contrib programs of libpng under OpenVMS
$! make "PNG: The Definitive Guide" demo programs (for X) under OpenVMS
$!
$! Script created by Martin Zinser for libpng; modified by Greg Roelofs
$! for standalone pngbook source distribution.
$!
$! Look for the compiler used
$!
$ zlibsrc = "[---.zlib]"
$ ccopt="/include=(''zlibsrc',[--])"
$! Set locations where zlib and libpng sources live.
$!
$ zpath = "[-.zlib]"
$ pngpath = "[-.libpng]"
$!
$! USE THESE INSTEAD if building from libpng's [.contrib.gregbook] directory:
$! zpath = "[---.zlib]"
$! pngpath = "[--]"
$!
$! Look for the compiler used.
$!
$ ccopt="/include=(''zpath',''pngpath')"
$ if f$getsyi("HW_MODEL").ge.1024
$ then
$ ccopt = "/prefix=all"+ccopt
......@@ -29,13 +40,16 @@ $ comp = "__decc__=1"
$ endif
$ endif
$ open/write lopt lib.opt
$ write lopt "[--]libpng.olb/lib"
$ write lopt "''zlibsrc'libz.olb/lib"
$ write lopt "''pngpath'libpng.olb/lib"
$ write lopt "''zpath'libz.olb/lib"
$ close lopt
$ open/write xopt x11.opt
$ write xopt "sys$library:decw$xlibshr.exe/share"
$ close xopt
$ write sys$output "Compiling PNG contrib programs ..."
$!
$! Build 'em.
$!
$ write sys$output "Compiling PNG book programs ..."
$ CALL MAKE readpng.OBJ "cc ''CCOPT' readpng" -
readpng.c readpng.h
$ CALL MAKE readpng2.OBJ "cc ''CCOPT' readpng2" -
......
contrib/gregbook/readpng.c
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......@@ -4,7 +4,7 @@
---------------------------------------------------------------------------
Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
Copyright (c) 1998-2000 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
......@@ -32,8 +32,13 @@
#include <stdio.h>
#include <stdlib.h>
#include "png.h" /* libpng header; includes zlib.h */
#include "readpng.h" /* typedefs, common macros, public prototypes */
#include "png.h" /* libpng header; includes zlib.h */
#include "readpng.h" /* typedefs, common macros, public prototypes */
/* future versions of libpng will provide this macro: */
#ifndef png_jmpbuf
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#endif
static png_structp png_ptr = NULL;
......@@ -44,7 +49,7 @@ int bit_depth, color_type;
uch *image_data = NULL;
void readpng_version_info()
void readpng_version_info(void)
{
fprintf(stderr, " Compiled with libpng %s; using libpng %s.\n",
PNG_LIBPNG_VER_STRING, png_libpng_ver);
......@@ -55,7 +60,7 @@ void readpng_version_info()
/* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
int readpng_init(FILE *infile, long *pWidth, long *pHeight)
int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
{
uch sig[8];
......@@ -89,7 +94,7 @@ int readpng_init(FILE *infile, long *pWidth, long *pHeight)
/* setjmp() must be called in every function that calls a PNG-reading
* libpng function */
if (setjmp(png_jmp_env(png_ptr))) {
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return 2;
}
......@@ -130,7 +135,7 @@ int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
/* setjmp() must be called in every function that calls a PNG-reading
* libpng function */
if (setjmp(png_jmp_env(png_ptr))) {
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return 2;
}
......@@ -184,7 +189,7 @@ uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
/* setjmp() must be called in every function that calls a PNG-reading
* libpng function */
if (setjmp(png_jmp_env(png_ptr))) {
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
......
contrib/gregbook/readpng.h
浏览文件 @ 520a764c
......@@ -4,7 +4,7 @@
---------------------------------------------------------------------------
Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
Copyright (c) 1998-2000 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
......@@ -54,7 +54,7 @@ typedef unsigned long ulg;
void readpng_version_info(void);
int readpng_init(FILE *infile, long *pWidth, long *pHeight);
int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);
int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);
......
contrib/gregbook/readpng2.c
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......@@ -4,7 +4,7 @@
---------------------------------------------------------------------------
Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
Copyright (c) 1998-2000 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
......@@ -30,10 +30,10 @@
---------------------------------------------------------------------------*/
#include <stdlib.h> /* for exit() prototype */
#include <stdlib.h> /* for exit() prototype */
#include "png.h" /* libpng header; includes zlib.h and setjmp.h */
#include "readpng2.h" /* typedefs, common macros, public prototypes */
#include "png.h" /* libpng header; includes zlib.h and setjmp.h */
#include "readpng2.h" /* typedefs, common macros, public prototypes */
/* local prototypes */
......@@ -47,7 +47,7 @@ static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);
void readpng2_version_info()
void readpng2_version_info(void)
{
fprintf(stderr, " Compiled with libpng %s; using libpng %s.\n",
PNG_LIBPNG_VER_STRING, png_libpng_ver);
......@@ -70,7 +70,7 @@ int readpng2_check_sig(uch *sig, int num)
int readpng2_init(mainprog_info *mainprog_ptr)
{
png_structp png_ptr; /* note: temporary variables! */
png_structp png_ptr; /* note: temporary variables! */
png_infop info_ptr;
......@@ -98,7 +98,7 @@ int readpng2_init(mainprog_info *mainprog_ptr)
* but compatible error handlers must either use longjmp() themselves
* (as in this program) or exit immediately, so here we are: */
if (setjmp(png_jmp_env(mainprog_ptr))) {
if (setjmp(mainprog_ptr->jmpbuf)) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return 2;
}
......@@ -136,7 +136,7 @@ int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length)
/* setjmp() must be called in every function that calls a PNG-reading
* libpng function */
if (setjmp(png_jmp_env(mainprog_ptr))) {
if (setjmp(mainprog_ptr->jmpbuf)) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
mainprog_ptr->png_ptr = NULL;
mainprog_ptr->info_ptr = NULL;
......@@ -176,7 +176,7 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
mainprog_ptr = png_get_progressive_ptr(png_ptr);
if (mainprog_ptr == NULL) { /* we be hosed */
if (mainprog_ptr == NULL) { /* we be hosed */
fprintf(stderr,
"readpng2 error: main struct not recoverable in info_callback.\n");
fflush(stderr);
......@@ -283,7 +283,7 @@ static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
png_read_update_info(png_ptr, info_ptr);
mainprog_ptr->rowbytes = png_get_rowbytes(png_ptr, info_ptr);
mainprog_ptr->rowbytes = (int)png_get_rowbytes(png_ptr, info_ptr);
mainprog_ptr->channels = png_get_channels(png_ptr, info_ptr);
......@@ -323,6 +323,11 @@ static void readpng2_row_callback(png_structp png_ptr, png_bytep new_row,
mainprog_ptr = png_get_progressive_ptr(png_ptr);
/* save the pass number for optional use by the front end */
mainprog_ptr->pass = pass;
/* have libpng either combine the new row data with the existing row data
* from previous passes (if interlaced) or else just copy the new row
* into the main program's image buffer */
......@@ -408,7 +413,7 @@ static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg)
fflush(stderr);
mainprog_ptr = png_get_error_ptr(png_ptr);
if (mainprog_ptr == NULL) { /* we are completely hosed now */
if (mainprog_ptr == NULL) { /* we are completely hosed now */
fprintf(stderr,
"readpng2 severe error: jmpbuf not recoverable; terminating.\n");
fflush(stderr);
......
contrib/gregbook/readpng2.h
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......@@ -4,7 +4,7 @@
---------------------------------------------------------------------------
Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
Copyright (c) 1998-2000 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
......@@ -61,7 +61,8 @@ typedef struct _mainprog_info {
uch *image_data;
uch **row_pointers;
jmp_buf jmpbuf;
int passes; /* not used */
int passes; /* not used */
int pass;
int rowbytes;
int channels;
int need_bgcolor;
......
contrib/gregbook/rpng-win.c
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......@@ -16,7 +16,16 @@
---------------------------------------------------------------------------
Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
Changelog:
- 1.00: initial public release
- 1.01: modified to allow abbreviated options; fixed long/ulong mis-
match; switched to png_jmpbuf() macro
- 1.02: added extra set of parentheses to png_jmpbuf() macro; fixed
command-line parsing bug
---------------------------------------------------------------------------
Copyright (c) 1998-2000 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
......@@ -43,7 +52,7 @@
#define PROGNAME "rpng-win"
#define LONGNAME "Simple PNG Viewer for Windows"
#define VERSION "1.0 of 20 February 1999"
#define VERSION "1.02 of 19 March 2000"
#include <stdio.h>
#include <stdlib.h>
......@@ -53,7 +62,7 @@
/* #define DEBUG : this enables the Trace() macros */
#include "readpng.h" /* typedefs, common macros, readpng prototypes */
#include "readpng.h" /* typedefs, common macros, readpng prototypes */
/* could just include png.h, but this macro is the only thing we need
......@@ -61,10 +70,10 @@
* only happen with alpha (which could easily be avoided with
* "ush acopy = (alpha);") */
#define alpha_composite(composite, fg, alpha, bg) { \
ush temp = ((ush)(fg)*(ush)(alpha) + \
(ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
(composite) = (uch)((temp + (temp >> 8)) >> 8); \
#define alpha_composite(composite, fg, alpha, bg) { \
ush temp = ((ush)(fg)*(ush)(alpha) + \
(ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
(composite) = (uch)((temp + (temp >> 8)) >> 8); \
}
......@@ -78,7 +87,7 @@ LRESULT CALLBACK rpng_win_wndproc(HWND, UINT, WPARAM, LPARAM);
static char titlebar[1024], *window_name = titlebar;
static char *progname = PROGNAME;
static char *appname = LONGNAME;
static char *icon_name = PROGNAME; /* GRR: not (yet) used */
static char *icon_name = PROGNAME; /* GRR: not (yet) used */
static char *filename;
static FILE *infile;
......@@ -104,15 +113,15 @@ static HWND global_hwnd;
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
{
char *args[1024]; /* arbitrary limit, but should suffice */
char *args[1024]; /* arbitrary limit, but should suffice */
char *p, *q, **argv = args;
int argc = 0;
int rc, alen, flen;
int error = 0;
int have_bg = FALSE;
double LUT_exponent; /* just the lookup table */
double CRT_exponent = 2.2; /* just the monitor */
double default_display_exponent; /* whole display system */
double LUT_exponent; /* just the lookup table */
double CRT_exponent = 2.2; /* just the monitor */
double default_display_exponent; /* whole display system */
MSG msg;
......@@ -199,20 +208,24 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
/* Now parse the command line for options and the PNG filename. */
while (*++argv && !error) {
if (!strcmp(*argv, "-gamma")) {
if (!strncmp(*argv, "-gamma", 2)) {
if (!*++argv)
++error;
display_exponent = atof(*argv);
if (display_exponent <= 0.0)
++error;
} else if (!strcmp(*argv, "-bgcolor")) {
else {
display_exponent = atof(*argv);
if (display_exponent <= 0.0)
++error;
}
} else if (!strncmp(*argv, "-bgcolor", 2)) {
if (!*++argv)
++error;
bgstr = *argv;
if (strlen(bgstr) != 7 || bgstr[0] != '#')
++error;
else
have_bg = TRUE;
else {
bgstr = *argv;
if (strlen(bgstr) != 7 || bgstr[0] != '#')
++error;
else
have_bg = TRUE;
}
} else {
if (**argv != '-') {
filename = *argv;
......@@ -255,6 +268,9 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
fclose(infile);
}
/* usage screen */
if (error) {
fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname);
readpng_version_info();
......@@ -265,7 +281,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
"\t\t to the product of the lookup-table exponent (varies)\n"
"\t\t and the CRT exponent (usually 2.2); must be positive\n"
" bg \tdesired background color in 7-character hex RGB format\n"
"\t\t (e.g., ``#ff7f00'' for orange: same as HTML colors);\n"
"\t\t (e.g., ``#ff7700'' for orange: same as HTML colors);\n"
"\t\t used with transparent images\n"
"\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
"\n", PROGNAME, default_display_exponent);
......@@ -336,6 +352,10 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
/* wait for the user to tell us when to quit */
printf(
"Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n");
fflush(stdout);
while (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
......@@ -371,7 +391,7 @@ static int rpng_win_create_window(HINSTANCE hInst, int showmode)
if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +
wimage_rowbytes*image_height)))
{
return 4; /* fail */
return 4; /* fail */
}
/*---------------------------------------------------------------------------
......@@ -477,7 +497,7 @@ static int rpng_win_display_image()
g = *src++;
b = *src++;
*dest++ = b;
*dest++ = g; /* note reverse order */
*dest++ = g; /* note reverse order */
*dest++ = r;
}
} else /* if (image_channels == 4) */ {
......@@ -582,15 +602,15 @@ LRESULT CALLBACK rpng_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)
/* wait for the user to tell us when to quit */
case WM_CHAR:
switch (wP) { /* only need one, so ignore repeat count */
switch (wP) { /* only need one, so ignore repeat count */
case 'q':
case 'Q':
case 0x1B: /* Esc key */
case 0x1B: /* Esc key */
PostQuitMessage(0);
}
return 0;
case WM_LBUTTONDOWN: /* another way of quitting */
case WM_LBUTTONDOWN: /* another way of quitting */
case WM_DESTROY:
PostQuitMessage(0);
return 0;
......
contrib/gregbook/rpng-x.c
浏览文件 @ 520a764c
此差异已折叠。
contrib/gregbook/rpng2-win.c
浏览文件 @ 520a764c
......@@ -22,10 +22,13 @@
Changelog:
- 1.01: initial public release
- 1.02: fixed cut-and-paste error in usage screen (oops...)
- 1.03: modified to allow abbreviated options
- 1.04: removed bogus extra argument from usage fprintf() [Glenn R-P?];
fixed command-line parsing bug
---------------------------------------------------------------------------
Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
Copyright (c) 1998-2000 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
......@@ -52,14 +55,14 @@
#define PROGNAME "rpng2-win"
#define LONGNAME "Progressive PNG Viewer for Windows"
#define VERSION "1.02 of 22 September 1999"
#define VERSION "1.04 of 19 March 2000"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h> /* for jmpbuf declaration in readpng2.h */
#include <setjmp.h> /* for jmpbuf declaration in readpng2.h */
#include <time.h>
#include <math.h> /* only for PvdM background code */
#include <math.h> /* only for PvdM background code */
#include <windows.h>
/* all for PvdM background code: */
......@@ -80,9 +83,9 @@
#define rgb2_max bg_bsat
#define rgb2_min bg_brot
/* #define DEBUG */ /* this enables the Trace() macros */
/* #define DEBUG */ /* this enables the Trace() macros */
#include "readpng2.h" /* typedefs, common macros, readpng2 prototypes */
#include "readpng2.h" /* typedefs, common macros, readpng2 prototypes */
/* could just include png.h, but this macro is the only thing we need
......@@ -90,18 +93,18 @@
* only happen with alpha (which could easily be avoided with
* "ush acopy = (alpha);") */
#define alpha_composite(composite, fg, alpha, bg) { \
ush temp = ((ush)(fg)*(ush)(alpha) + \
(ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
(composite) = (uch)((temp + (temp >> 8)) >> 8); \
#define alpha_composite(composite, fg, alpha, bg) { \
ush temp = ((ush)(fg)*(ush)(alpha) + \
(ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
(composite) = (uch)((temp + (temp >> 8)) >> 8); \
}
#define INBUFSIZE 4096 /* with pseudo-timing on (1 sec delay/block), this
* block size corresponds roughly to a download
* speed 10% faster than theoretical 33.6K maximum
* (assuming 8 data bits, 1 stop bit and no other
* overhead) */
#define INBUFSIZE 4096 /* with pseudo-timing on (1 sec delay/block), this
* block size corresponds roughly to a download
* speed 10% faster than theoretical 33.6K maximum
* (assuming 8 data bits, 1 stop bit and no other
* overhead) */
/* local prototypes */
static void rpng2_win_init(void);
......@@ -116,7 +119,7 @@ LRESULT CALLBACK rpng2_win_wndproc(HWND, UINT, WPARAM, LPARAM);
static char titlebar[1024], *window_name = titlebar;
static char *progname = PROGNAME;
static char *appname = LONGNAME;
static char *icon_name = PROGNAME; /* GRR: not (yet) used */
static char *icon_name = PROGNAME; /* GRR: not (yet) used */
static char *filename;
static FILE *infile;
......@@ -125,7 +128,7 @@ static mainprog_info rpng2_info;
static uch inbuf[INBUFSIZE];
static int incount;
static int pat = 6; /* must be less than num_bgpat */
static int pat = 6; /* must be less than num_bgpat */
static int bg_image = 0;
static int bgscale = 16;
static ulg bg_rowbytes;
......@@ -134,22 +137,22 @@ static uch *bg_data;
static struct rgb_color {
uch r, g, b;
} rgb[] = {
{ 0, 0, 0}, /* 0: black */
{255, 255, 255}, /* 1: white */
{173, 132, 57}, /* 2: tan */
{ 64, 132, 0}, /* 3: medium green */
{189, 117, 1}, /* 4: gold */
{253, 249, 1}, /* 5: yellow */
{ 0, 0, 255}, /* 6: blue */
{ 0, 0, 120}, /* 7: medium blue */
{255, 0, 255}, /* 8: magenta */
{ 64, 0, 64}, /* 9: dark magenta */
{255, 0, 0}, /* 10: red */
{ 64, 0, 0}, /* 11: dark red */
{255, 127, 0}, /* 12: orange */
{192, 96, 0}, /* 13: darker orange */
{ 24, 60, 0}, /* 14: dark green-yellow */
{ 85, 125, 200} /* 15: ice blue */
{ 0, 0, 0}, /* 0: black */
{255, 255, 255}, /* 1: white */
{173, 132, 57}, /* 2: tan */
{ 64, 132, 0}, /* 3: medium green */
{189, 117, 1}, /* 4: gold */
{253, 249, 1}, /* 5: yellow */
{ 0, 0, 255}, /* 6: blue */
{ 0, 0, 120}, /* 7: medium blue */
{255, 0, 255}, /* 8: magenta */
{ 64, 0, 64}, /* 9: dark magenta */
{255, 0, 0}, /* 10: red */
{ 64, 0, 0}, /* 11: dark red */
{255, 127, 0}, /* 12: orange */
{192, 96, 0}, /* 13: darker orange */
{ 24, 60, 0}, /* 14: dark green-yellow */
{ 85, 125, 200} /* 15: ice blue */
};
/* not used for now, but should be for error-checking:
static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
......@@ -174,25 +177,25 @@ static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
*/
static struct background_pattern {
ush type;
int rgb1_max, rgb1_min; /* or bg_freq, bg_gray */
int rgb2_max, rgb2_min; /* or bg_bsat, bg_brot (both scaled by 10)*/
int rgb1_max, rgb1_min; /* or bg_freq, bg_gray */
int rgb2_max, rgb2_min; /* or bg_bsat, bg_brot (both scaled by 10)*/
} bg[] = {
{0+8, 2,0, 1,15}, /* checkered: tan/black vs. white/ice blue */
{0+24, 2,0, 1,0}, /* checkered: tan/black vs. white/black */
{0+8, 4,5, 0,2}, /* checkered: gold/yellow vs. black/tan */
{0+8, 4,5, 0,6}, /* checkered: gold/yellow vs. black/blue */
{0, 7,0, 8,9}, /* checkered: deep blue/black vs. magenta */
{0+8, 13,0, 5,14}, /* checkered: orange/black vs. yellow */
{0+8, 12,0, 10,11}, /* checkered: orange/black vs. red */
{1, 7,0, 8,0}, /* diamonds: deep blue/black vs. magenta */
{1, 12,0, 11,0}, /* diamonds: orange vs. dark red */
{1, 10,0, 7,0}, /* diamonds: red vs. medium blue */
{1, 4,0, 5,0}, /* diamonds: gold vs. yellow */
{1, 3,0, 0,0}, /* diamonds: medium green vs. black */
{2, 16, 100, 20, 0}, /* radial: ~hard radial color-beams */
{2, 18, 100, 10, 2}, /* radial: soft, curved radial color-beams */
{2, 16, 256, 100, 250}, /* radial: very tight spiral */
{2, 10000, 256, 11, 0} /* radial: dipole-moire' (almost fractal) */
{0+8, 2,0, 1,15}, /* checkered: tan/black vs. white/ice blue */
{0+24, 2,0, 1,0}, /* checkered: tan/black vs. white/black */
{0+8, 4,5, 0,2}, /* checkered: gold/yellow vs. black/tan */
{0+8, 4,5, 0,6}, /* checkered: gold/yellow vs. black/blue */
{0, 7,0, 8,9}, /* checkered: deep blue/black vs. magenta */
{0+8, 13,0, 5,14}, /* checkered: orange/black vs. yellow */
{0+8, 12,0, 10,11}, /* checkered: orange/black vs. red */
{1, 7,0, 8,0}, /* diamonds: deep blue/black vs. magenta */
{1, 12,0, 11,0}, /* diamonds: orange vs. dark red */
{1, 10,0, 7,0}, /* diamonds: red vs. medium blue */
{1, 4,0, 5,0}, /* diamonds: gold vs. yellow */
{1, 3,0, 0,0}, /* diamonds: medium green vs. black */
{2, 16, 100, 20, 0}, /* radial: ~hard radial color-beams */
{2, 18, 100, 10, 2}, /* radial: soft, curved radial color-beams */
{2, 16, 256, 100, 250}, /* radial: very tight spiral */
{2, 10000, 256, 11, 0} /* radial: dipole-moire' (almost fractal) */
};
static int num_bgpat = sizeof(bg) / sizeof(struct background_pattern);
......@@ -212,16 +215,17 @@ static int global_showmode;
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
{
char *args[1024]; /* arbitrary limit, but should suffice */
char *p, *q, *bgstr = NULL, **argv = args;
char *args[1024]; /* arbitrary limit, but should suffice */
char **argv = args;
char *p, *q, *bgstr = NULL;
int argc = 0;
int rc, alen, flen;
int error = 0;
int timing = FALSE;
int have_bg = FALSE;
double LUT_exponent; /* just the lookup table */
double CRT_exponent = 2.2; /* just the monitor */
double default_display_exponent; /* whole display system */
double LUT_exponent; /* just the lookup table */
double CRT_exponent = 2.2; /* just the monitor */
double default_display_exponent; /* whole display system */
MSG msg;
......@@ -316,33 +320,39 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
/* Now parse the command line for options and the PNG filename. */
while (*++argv && !error) {
if (!strcmp(*argv, "-gamma")) {
if (!strncmp(*argv, "-gamma", 2)) {
if (!*++argv)
++error;
rpng2_info.display_exponent = atof(*argv);
if (rpng2_info.display_exponent <= 0.0)
++error;
} else if (!strcmp(*argv, "-bgcolor")) {
else {
rpng2_info.display_exponent = atof(*argv);
if (rpng2_info.display_exponent <= 0.0)
++error;
}
} else if (!strncmp(*argv, "-bgcolor", 4)) {
if (!*++argv)
++error;
bgstr = *argv;
if (strlen(bgstr) != 7 || bgstr[0] != '#')
++error;
else {
have_bg = TRUE;
bg_image = FALSE;
bgstr = *argv;
if (strlen(bgstr) != 7 || bgstr[0] != '#')
++error;
else {
have_bg = TRUE;
bg_image = FALSE;
}
}
} else if (!strcmp(*argv, "-bgpat")) {
} else if (!strncmp(*argv, "-bgpat", 4)) {
if (!*++argv)
++error;
pat = atoi(*argv) - 1;
if (pat < 0 || pat >= num_bgpat)
++error;
else {
bg_image = TRUE;
have_bg = FALSE;
pat = atoi(*argv) - 1;
if (pat < 0 || pat >= num_bgpat)
++error;
else {
bg_image = TRUE;
have_bg = FALSE;
}
}
} else if (!strcmp(*argv, "-timing")) {
} else if (!strncmp(*argv, "-timing", 2)) {
timing = TRUE;
} else {
if (**argv != '-') {
......@@ -387,6 +397,9 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
fclose(infile);
}
/* usage screen */
if (error) {
fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname);
readpng2_version_info();
......@@ -398,14 +411,14 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
"\t\t to the product of the lookup-table exponent (varies)\n"
"\t\t and the CRT exponent (usually 2.2); must be positive\n"
" bg \tdesired background color in 7-character hex RGB format\n"
"\t\t (e.g., ``#ff7f00'' for orange: same as HTML colors);\n"
"\t\t (e.g., ``#ff7700'' for orange: same as HTML colors);\n"
"\t\t used with transparent images; overrides -bgpat\n"
" pat \tdesired background pattern number (1-%d); used with\n"
"\t\t transparent images; overrides -bgcolor\n"
" -timing\tenables delay for every block read, to simulate modem\n"
"\t\t download of image (~36 Kbps)\n"
"\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
"\n", PROGNAME, " ", default_display_exponent, num_bgpat);
"\n", PROGNAME, default_display_exponent, num_bgpat);
exit(1);
}
......@@ -560,7 +573,7 @@ static int rpng2_win_create_window()
if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +
wimage_rowbytes*rpng2_info.height)))
{
return 4; /* fail */
return 4; /* fail */
}
/*---------------------------------------------------------------------------
......@@ -655,7 +668,7 @@ static int rpng2_win_create_window()
TextOut(hdc, ((x < 0)? 0 : x), ((y < 0)? 0 : y), msg, len);
ReleaseDC(global_hwnd, hdc);
rpng2_win_load_bg_image(); /* resets bg_image if fails */
rpng2_win_load_bg_image(); /* resets bg_image if fails */
}
if (!bg_image) {
......@@ -753,7 +766,7 @@ static int rpng2_win_load_bg_image()
even_odd = even_odd_vert ^ even_odd_horiz;
invert_column =
(even_odd_horiz && (bg[pat].type & 0x10));
if (even_odd == 0) { /* gradient #1 */
if (even_odd == 0) { /* gradient #1 */
if (invert_column) {
*dest++ = r1_inv;
*dest++ = g1_inv;
......@@ -763,16 +776,16 @@ static int rpng2_win_load_bg_image()
*dest++ = g1;
*dest++ = b1;
}
} else { /* gradient #2 */
} else { /* gradient #2 */
if ((invert_column && invert_gradient2) ||
(!invert_column && !invert_gradient2))
{
*dest++ = r2; /* not inverted or */
*dest++ = g2; /* doubly inverted */
*dest++ = r2; /* not inverted or */
*dest++ = g2; /* doubly inverted */
*dest++ = b2;
} else {
*dest++ = r2_inv;
*dest++ = g2_inv; /* singly inverted */
*dest++ = g2_inv; /* singly inverted */
*dest++ = b2_inv;
}
}
......@@ -908,7 +921,7 @@ static int rpng2_win_load_bg_image()
g1 = *src++;
b1 = *src++;
*dest++ = b1;
*dest++ = g1; /* note reverse order */
*dest++ = g1; /* note reverse order */
*dest++ = r1;
}
}
......@@ -962,7 +975,7 @@ static void rpng2_win_display_row(ulg row)
g = *src++;
b = *src++;
*dest++ = b;
*dest++ = g; /* note reverse order */
*dest++ = g; /* note reverse order */
*dest++ = r;
}
} else /* if (rpng2_info.channels == 4) */ {
......@@ -1028,7 +1041,9 @@ static void rpng2_win_finish_display()
* that the image is done */
rpng2_info.done = TRUE;
printf("Done. Press Q, Esc or mouse button 1 to quit.\n");
printf(
"Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n");
fflush(stdout);
}
......@@ -1084,15 +1099,15 @@ LRESULT CALLBACK rpng2_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)
/* wait for the user to tell us when to quit */
case WM_CHAR:
switch (wP) { /* only need one, so ignore repeat count */
switch (wP) { /* only need one, so ignore repeat count */
case 'q':
case 'Q':
case 0x1B: /* Esc key */
case 0x1B: /* Esc key */
PostQuitMessage(0);
}
return 0;
case WM_LBUTTONDOWN: /* another way of quitting */
case WM_LBUTTONDOWN: /* another way of quitting */
case WM_DESTROY:
PostQuitMessage(0);
return 0;
......
contrib/gregbook/rpng2-x.c
浏览文件 @ 520a764c
此差异已折叠。
contrib/gregbook/wpng.c
浏览文件 @ 520a764c
......@@ -19,7 +19,15 @@
---------------------------------------------------------------------------
Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
Changelog:
- 1.01: initial public release
- 1.02: modified to allow abbreviated options
- 1.03: removed extraneous character from usage screen; fixed bug in
command-line parsing
---------------------------------------------------------------------------
Copyright (c) 1998-2000 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
......@@ -45,7 +53,7 @@
---------------------------------------------------------------------------*/
#define PROGNAME "wpng"
#define VERSION "1.01 of 31 March 1999"
#define VERSION "1.03 of 19 March 2000"
#define APPNAME "Simple PGM/PPM/PAM to PNG Converter"
#if defined(__MSDOS__) || defined(__OS2__)
......@@ -57,27 +65,27 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h> /* for jmpbuf declaration in writepng.h */
#include <setjmp.h> /* for jmpbuf declaration in writepng.h */
#include <time.h>
#ifdef DOS_OS2_W32
# include <io.h> /* for isatty(), setmode() prototypes */
# include <fcntl.h> /* O_BINARY for fdopen() without text translation */
# include <io.h> /* for isatty(), setmode() prototypes */
# include <fcntl.h> /* O_BINARY for fdopen() without text translation */
# ifdef __EMX__
# ifndef getch
# define getch() _read_kbd(0, 1, 0) /* need getche() */
# define getch() _read_kbd(0, 1, 0) /* need getche() */
# endif
# else /* !__EMX__ */
# ifdef __GO32__
# include <pc.h>
# define getch() getkey() /* GRR: need getche() */
# define getch() getkey() /* GRR: need getche() */
# else
# include <conio.h> /* for getche() console input */
# include <conio.h> /* for getche() console input */
# endif
# endif /* ?__EMX__ */
# define FGETS(buf,len,stream) dos_kbd_gets(buf,len)
#else
# include <unistd.h> /* for isatty() prototype */
# include <unistd.h> /* for isatty() prototype */
# define FGETS fgets
#endif
......@@ -87,7 +95,7 @@
text that includes control characters discouraged by the PNG spec; text
that includes an escape character (27) must be re-entered regardless */
#include "writepng.h" /* typedefs, common macros, writepng prototypes */
#include "writepng.h" /* typedefs, common macros, writepng prototypes */
......@@ -112,7 +120,7 @@ int main(int argc, char **argv)
FILE *keybd;
#endif
#ifdef sgi
FILE *tmpfile; /* or we could just use keybd, since no overlap */
FILE *tmpfile; /* or we could just use keybd, since no overlap */
char tmpline[80];
#endif
char *inname = NULL, outname[256];
......@@ -204,36 +212,40 @@ int main(int argc, char **argv)
/* Now parse the command line for options and the PNM filename. */
while (*++argv && !error) {
if (!strcmp(*argv, "-interlaced")) {
if (!strncmp(*argv, "-i", 2)) {
wpng_info.interlaced = TRUE;
} else if (!strcmp(*argv, "-time")) {
} else if (!strncmp(*argv, "-time", 3)) {
wpng_info.modtime = time(NULL);
wpng_info.have_time = TRUE;
} else if (!strcmp(*argv, "-text")) {
} else if (!strncmp(*argv, "-text", 3)) {
text = TRUE;
} else if (!strcmp(*argv, "-gamma")) {
} else if (!strncmp(*argv, "-gamma", 2)) {
if (!*++argv)
++error;
wpng_info.gamma = atof(*argv);
if (wpng_info.gamma <= 0.0)
++error;
else if (wpng_info.gamma > 1.01)
fprintf(stderr, PROGNAME
" warning: file gammas are usually less than 1.0\n");
} else if (!strcmp(*argv, "-bgcolor")) {
else {
wpng_info.gamma = atof(*argv);
if (wpng_info.gamma <= 0.0)
++error;
else if (wpng_info.gamma > 1.01)
fprintf(stderr, PROGNAME
" warning: file gammas are usually less than 1.0\n");
}
} else if (!strncmp(*argv, "-bgcolor", 4)) {
if (!*++argv)
++error;
bgstr = *argv;
if (strlen(bgstr) != 7 || bgstr[0] != '#')
++error;
else {
unsigned r, g, b; /* this approach quiets compiler warnings */
sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
wpng_info.bg_red = (uch)r;
wpng_info.bg_green = (uch)g;
wpng_info.bg_blue = (uch)b;
wpng_info.have_bg = TRUE;
bgstr = *argv;
if (strlen(bgstr) != 7 || bgstr[0] != '#')
++error;
else {
unsigned r, g, b; /* this way quiets compiler warnings */
sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
wpng_info.bg_red = (uch)r;
wpng_info.bg_green = (uch)g;
wpng_info.bg_blue = (uch)b;
wpng_info.have_bg = TRUE;
}
}
} else {
if (**argv != '-') {
......@@ -362,7 +374,7 @@ int main(int argc, char **argv)
"\t\t (where LUT = lookup-table exponent and CRT = CRT exponent;\n"
"\t\t first varies, second is usually 2.2, all are positive)\n"
" bg \tdesired background color for alpha-channel images, in\n"
"\t\t 7-character hex RGB format (e.g., ``#ff7f00'' for orange:\n"
"\t\t 7-character hex RGB format (e.g., ``#ff7700'' for orange:\n"
"\t\t same as HTML colors)\n"
" -text\tprompt interactively for text info (tEXt chunks)\n"
" -time\tinclude a tIME chunk (last modification time)\n"
......@@ -419,7 +431,7 @@ int main(int argc, char **argv)
wpng_info.have_text &= ~TEXT_TITLE;
valid = FALSE;
#else
if (p[result] == 27) { /* escape character */
if (p[result] == 27) { /* escape character */
wpng_info.have_text &= ~TEXT_TITLE;
valid = FALSE;
}
......@@ -449,7 +461,7 @@ int main(int argc, char **argv)
wpng_info.have_text &= ~TEXT_AUTHOR;
valid = FALSE;
#else
if (p[result] == 27) { /* escape character */
if (p[result] == 27) { /* escape character */
wpng_info.have_text &= ~TEXT_AUTHOR;
valid = FALSE;
}
......@@ -489,7 +501,7 @@ int main(int argc, char **argv)
wpng_info.have_text &= ~TEXT_DESC;
valid = FALSE;
#else
if (p[result] == 27) { /* escape character */
if (p[result] == 27) { /* escape character */
wpng_info.have_text &= ~TEXT_DESC;
valid = FALSE;
}
......@@ -519,7 +531,7 @@ int main(int argc, char **argv)
wpng_info.have_text &= ~TEXT_COPY;
valid = FALSE;
#else
if (p[result] == 27) { /* escape character */
if (p[result] == 27) { /* escape character */
wpng_info.have_text &= ~TEXT_COPY;
valid = FALSE;
}
......@@ -549,7 +561,7 @@ int main(int argc, char **argv)
wpng_info.have_text &= ~TEXT_EMAIL;
valid = FALSE;
#else
if (p[result] == 27) { /* escape character */
if (p[result] == 27) { /* escape character */
wpng_info.have_text &= ~TEXT_EMAIL;
valid = FALSE;
}
......@@ -579,7 +591,7 @@ int main(int argc, char **argv)
wpng_info.have_text &= ~TEXT_URL;
valid = FALSE;
#else
if (p[result] == 27) { /* escape character */
if (p[result] == 27) { /* escape character */
wpng_info.have_text &= ~TEXT_URL;
valid = FALSE;
}
......@@ -755,7 +767,7 @@ static int wpng_isvalid_latin1(uch *p, int len)
static void wpng_cleanup()
static void wpng_cleanup(void)
{
if (wpng_info.outfile) {
fclose(wpng_info.outfile);
......@@ -791,11 +803,11 @@ static char *dos_kbd_gets(char *buf, int len)
buf[count++] = ch = getche();
} while (ch != '\r' && count < len-1);
buf[count--] = '\0'; /* terminate string */
if (buf[count] == '\r') /* Enter key makes CR, so change to newline */
buf[count--] = '\0'; /* terminate string */
if (buf[count] == '\r') /* Enter key makes CR, so change to newline */
buf[count] = '\n';
fprintf(stderr, "\n"); /* Enter key does *not* cause a newline */
fprintf(stderr, "\n"); /* Enter key does *not* cause a newline */
fflush(stderr);
return buf;
......
contrib/gregbook/writepng.c
浏览文件 @ 520a764c
......@@ -4,7 +4,7 @@
---------------------------------------------------------------------------
Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
Copyright (c) 1998-2000 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
......@@ -30,10 +30,10 @@
---------------------------------------------------------------------------*/
#include <stdlib.h> /* for exit() prototype */
#include <stdlib.h> /* for exit() prototype */
#include "png.h" /* libpng header; includes zlib.h and setjmp.h */
#include "writepng.h" /* typedefs, common macros, public prototypes */
#include "png.h" /* libpng header; includes zlib.h and setjmp.h */
#include "writepng.h" /* typedefs, common macros, public prototypes */
/* local prototype */
......@@ -42,7 +42,7 @@ static void writepng_error_handler(png_structp png_ptr, png_const_charp msg);
void writepng_version_info()
void writepng_version_info(void)
{
fprintf(stderr, " Compiled with libpng %s; using libpng %s.\n",
PNG_LIBPNG_VER_STRING, png_libpng_ver);
......@@ -82,7 +82,7 @@ int writepng_init(mainprog_info *mainprog_ptr)
* but compatible error handlers must either use longjmp() themselves
* (as in this program) or exit immediately, so here we go: */
if (setjmp(png_jmp_env(mainprog_ptr))) {
if (setjmp(mainprog_ptr->jmpbuf)) {
png_destroy_write_struct(&png_ptr, &info_ptr);
return 2;
}
......@@ -239,7 +239,7 @@ int writepng_encode_image(mainprog_info *mainprog_ptr)
/* as always, setjmp() must be called in every function that calls a
* PNG-writing libpng function */
if (setjmp(png_jmp_env(mainprog_ptr))) {
if (setjmp(mainprog_ptr->jmpbuf)) {
png_destroy_write_struct(&png_ptr, &info_ptr);
mainprog_ptr->png_ptr = NULL;
mainprog_ptr->info_ptr = NULL;
......@@ -277,7 +277,7 @@ int writepng_encode_row(mainprog_info *mainprog_ptr) /* NON-interlaced only! */
/* as always, setjmp() must be called in every function that calls a
* PNG-writing libpng function */
if (setjmp(png_jmp_env(mainprog_ptr))) {
if (setjmp(mainprog_ptr->jmpbuf)) {
png_destroy_write_struct(&png_ptr, &info_ptr);
mainprog_ptr->png_ptr = NULL;
mainprog_ptr->info_ptr = NULL;
......@@ -307,7 +307,7 @@ int writepng_encode_finish(mainprog_info *mainprog_ptr) /* NON-interlaced! */
/* as always, setjmp() must be called in every function that calls a
* PNG-writing libpng function */
if (setjmp(png_jmp_env(mainprog_ptr))) {
if (setjmp(mainprog_ptr->jmpbuf)) {
png_destroy_write_struct(&png_ptr, &info_ptr);
mainprog_ptr->png_ptr = NULL;
mainprog_ptr->info_ptr = NULL;
......
contrib/gregbook/writepng.h
浏览文件 @ 520a764c
......@@ -4,7 +4,7 @@
---------------------------------------------------------------------------
Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
Copyright (c) 1998-2000 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
......
contrib/pngminus/png2pnm.c
浏览文件 @ 520a764c
......@@ -42,6 +42,11 @@
#include "png.h"
/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
#ifndef png_jmpbuf
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#endif
/* function prototypes */
int main (int argc, char *argv[]);
......@@ -223,7 +228,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
return FALSE; /* out of memory */
}
if (setjmp (png_jmp_env(png_ptr)))
if (setjmp (png_jmpbuf(png_ptr)))
{
png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
return FALSE;
......
contrib/pngminus/pnm2png.c
浏览文件 @ 520a764c
......@@ -40,6 +40,11 @@
#include "png.h"
/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
#ifndef png_jmpbuf
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#endif
/* function prototypes */
int main (int argc, char *argv[]);
......@@ -386,7 +391,7 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
}
/* setjmp() must be called in every function that calls a PNG-reading libpng function */
if (setjmp (png_jmp_env(png_ptr)))
if (setjmp (png_jmpbuf(png_ptr)))
{
png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
return FALSE;
......
example.c
浏览文件 @ 520a764c
......@@ -6,17 +6,28 @@
/* This is an example of how to use libpng to read and write PNG files.
* The file libpng.txt is much more verbose then this. If you have not
* read it, do so first. This was designed to be a starting point of an
* implementation. This is not officially part of libpng, and therefore
* does not require a copyright notice.
* implementation. This is not officially part of libpng, is hereby placed
* in the public domain, and therefore does not require a copyright notice.
*
* This file does not currently compile, because it is missing certain
* parts, like allocating memory to hold an image. You will have to
* supply these parts to get it to compile. For an example of a minimal
* working PNG reader/writer, see pngtest.c, included in this distribution.
* working PNG reader/writer, see pngtest.c, included in this distribution;
* see also the programs in the contrib directory.
*/
#include "png.h"
/* The png_jmpbuf() macro, used in error handling, became available in
* libpng version 1.0.6. If you want to be able to run your code with older
* versions of libpng, you must define the macro yourself (but only if it
* is not already defined by libpng!).
*/
#ifndef png_jmpbuf
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#endif
/* Check to see if a file is a PNG file using png_sig_cmp(). png_sig_cmp()
* returns zero if the image is a PNG and nonzero if it isn't a PNG.
*
......@@ -111,7 +122,8 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
* the normal method of doing things with libpng). REQUIRED unless you
* set up your own error handlers in the png_create_read_struct() earlier.
*/
if (setjmp(png_jmp_env(png_ptr)))
if (setjmp(png_jmpbuf(png_ptr)))
{
/* Free all of the memory associated with the png_ptr and info_ptr */
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
......@@ -231,7 +243,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
screen_gamma = 1.7 or 1.0; /* A good guess for Mac systems */
}
/* Tell libpng to handle the gamma conversion for you. The second call
/* Tell libpng to handle the gamma conversion for you. The final call
* is a good guess for PC generated images, but it should be configurable
* by the user at run time by the user. It is strongly suggested that
* your application support gamma correction.
......@@ -240,7 +252,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
int intent;
if (png_get_sRGB(png_ptr, info_ptr, &intent))
png_set_sRGB(png_ptr, info_ptr, intent);
png_set_gamma(png_ptr, screen_gamma, 0.45455);
else
{
double image_gamma;
......@@ -405,7 +417,7 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
return ERROR;
}
if (setjmp(png_jmp_env((*png_ptr))))
if (setjmp(png_jmpbuf((*png_ptr))))
{
png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
return ERROR;
......@@ -433,7 +445,7 @@ int
process_data(png_structp *png_ptr, png_infop *info_ptr,
png_bytep buffer, png_uint_32 length)
{
if (setjmp(png_jmp_env((*png_ptr))))
if (setjmp(png_jmpbuf((*png_ptr))))
{
/* Free the png_ptr and info_ptr memory on error */
png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
......@@ -549,7 +561,7 @@ void write_png(char *file_name /* , ... other image information ... */)
/* Set error handling. REQUIRED if you aren't supplying your own
* error handling functions in the png_create_write_struct() call.
*/
if (setjmp(png_ptr->jmpbuf))
if (setjmp(png_jmpbuf(png_ptr)))
{
/* If we get here, we had a problem reading the file */
fclose(fp);
......@@ -632,7 +644,7 @@ void write_png(char *file_name /* , ... other image information ... */)
png_set_text(png_ptr, info_ptr, text_ptr, 3);
/* other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs, */
/* note that if sRGB is present the cHRM chunk must be ignored
/* note that if sRGB is present the gAMA and cHRM chunks must be ignored
* on read and must be written in accordance with the sRGB profile */
/* Write the file header information. REQUIRED */
......
libpng.3
浏览文件 @ 520a764c
.TH LIBPNG 3 "February 18, 2000"
.TH LIBPNG 3 "March 21, 2000"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5s
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.6
.SH SYNOPSIS
\fI\fB
......@@ -538,7 +538,11 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5s
\fI\fB
\fBvoid png_set_rgb_to_gray (png_structp \fP\fIpng_ptr\fP\fB, int \fIerror_action\fP\fB);\fP
\fBvoid png_set_rgb_to_gray (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIerror_action\fP\fB, double \fP\fIred\fP\fB, double \fIgreen\fP\fB);\fP
\fI\fB
\fBvoid png_set_rgb_to_gray_fixed (png_structp \fP\fIpng_ptr\fP\fB, int error_action png_fixed_point \fP\fIred\fP\fB, png_fixed_point \fIgreen\fP\fB);\fP
\fI\fB
......@@ -709,7 +713,7 @@ Following is a copy of the libpng.txt file that accompanies libpng.
.SH LIBPNG.TXT
libpng.txt - A description on how to use and modify libpng
libpng version 1.0.5s - February 18, 2000
libpng version 1.0.6 - March 21, 2000
Updated and distributed by Glenn Randers-Pehrson
<randeg@alum.rpi.edu>
Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
......@@ -746,7 +750,9 @@ Libpng was written as a companion to the PNG specification, as a way
of reducing the amount of time and effort it takes to support the PNG
file format in application programs.
The PNG-1.2 specification is available at <http://www.cdrom.com/png>.
The PNG-1.2 specification is available at <http://www.cdrom.com/pub/png>
(will be moving to <http://www.libpng.org>)
and at <ftp://ftp.uu.net/graphics/png/documents/>.
The PNG-1.0 specification is available
as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> and as a
......@@ -756,7 +762,9 @@ documents at <ftp://ftp.uu.net/graphics/png/documents/>.
Other information
about PNG, and the latest version of libpng, can be found at the PNG home
page, <http://www.cdrom.com/pub/png/>.
page, <http://www.cdrom.com/pub/png/> (will be moving to
<http://www.libpng.org>)
and at <ftp://ftp.uu.net/graphics/png/>.
Most users will not have to modify the library significantly; advanced
users may want to modify it more. All attempts were made to make it as
......@@ -774,7 +782,7 @@ majority of the needs of its users.
Libpng uses zlib for its compression and decompression of PNG files.
Further information about zlib, and the latest version of zlib, can
be found at the zlib home page, <http://www.cdrom.com/pub/infozip/zlib/>.
be found at the zlib home page, <ftp://ftp.freesoftware.com/pub/infozip/zlib/>.
The zlib compression utility is a general purpose utility that is
useful for more than PNG files, and can be used without libpng.
See the documentation delivered with zlib for more details.
......@@ -899,9 +907,9 @@ handling and memory alloc/free functions.
When libpng encounters an error, it expects to longjmp back
to your routine. Therefore, you will need to call setjmp and pass
your png_jmp_env(png_ptr). If you read the file from different
your png_jmpbuf(png_ptr). If you read the file from different
routines, you will need to update the jmpbuf field every time you enter
a new routine that will call a png_ function.
a new routine that will call a png_*() function.
See your documentation of setjmp/longjmp for your compiler for more
information on setjmp/longjmp. See the discussion on libpng error
......@@ -910,7 +918,7 @@ on the libpng error handling. If an error occurs, and libpng longjmp's
back to your setjmp, you will want to call png_destroy_read_struct() to
free any memory.
if (setjmp(png_jmp_env(png_ptr)))
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr,
&end_info);
......@@ -990,38 +998,6 @@ To inform libpng about your function, use
png_set_read_status_fn(png_ptr, read_row_callback);
Finally, you can write your own transformation function if none of
the existing ones meets your needs. This is done by setting a callback
with
png_set_read_user_transform_fn(png_ptr,
read_transform_fn);
You must supply the function
void read_transform_fn(png_ptr ptr, row_info_ptr
row_info, png_bytep data)
See pngtest.c for a working example. Your function will be called
after all of the other transformations have been processed.
You can also set up a pointer to a user structure for use by your
callback function, and you can inform libpng that your transform
function will change the number of channels or bit depth with the
function
png_set_user_transform_info(png_ptr, user_ptr,
user_depth, user_channels);
The user's application, not libpng, is responsible for allocating and
freeing any memory required for the user structure.
You can retrieve the pointer via the function
png_get_user_transform_ptr(). For example:
voidp read_user_transform_ptr =
png_get_user_transform_ptr(png_ptr);
.SS Unknown-chunk handling
Now you get to set the way the library processes unknown chunks in the
......@@ -1093,24 +1069,6 @@ call to png_read_info().
This will process all chunks up to but not including the image data.
There is one transformation you may need to set up before doing
png_read_info(), however. In PNG files, the alpha channel in an image
is the level of opacity. If you need the alpha channel in an image to
be the level of transparency instead of opacity, you can invert the
alpha channel (or the tRNS chunk data) after it's read, so that 0 is
fully opaque and 255 (in 8-bit or paletted images) or 65535 (in 16-bit
images) is fully transparent, with
png_set_invert_alpha(png_ptr);
This must appear before png_write_info() instead of later with the
other transformations because in the case of paletted images the tRNS
chunk data has to be inverted before the tRNS chunk is written.
If your image is not a paletted image, the tRNS data (which in such cases
represents a single color to be rendered as transparent) won't need to
be changed, and you can safely do this transformation after your
png_read_info() call.
.SS Querying the info structure
Functions are used to get the information from the info_ptr once it
......@@ -1437,6 +1395,15 @@ it with the background, so that's what you should probably do):
if (color_type & PNG_COLOR_MASK_ALPHA)
png_set_strip_alpha(png_ptr);
In PNG files, the alpha channel in an image
is the level of opacity. If you need the alpha channel in an image to
be the level of transparency instead of opacity, you can invert the
alpha channel (or the tRNS chunk data) after it's read, so that 0 is
fully opaque and 255 (in 8-bit or paletted images) or 65535 (in 16-bit
images) is fully transparent, with
png_set_invert_alpha(png_ptr);
PNG files pack pixels of bit depths 1, 2, and 4 into bytes as small as
they can, resulting in, for example, 8 pixels per byte for 1 bit
files. This code expands to 1 pixel per byte without changing the
......@@ -1490,14 +1457,12 @@ RGB. This code will do that conversion:
png_set_gray_to_rgb(png_ptr);
Conversely, you can convert an RGB or RGBA image to grayscale or grayscale
with alpha. This is intended for conversion of images that really are
gray (red == green == blue), so the function simply strips out the red
and blue channels, leaving the green channel in the gray position.
with alpha.
if (color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA)
png_set_rgb_to_gray(png_ptr, error_action,
double red_weight, double green_weight);
png_set_rgb_to_gray_fixed(png_ptr, error_action,
int red_weight, int green_weight);
error_action = 1: silently do the conversion
error_action = 2: issue a warning if the original
......@@ -1508,10 +1473,10 @@ and blue channels, leaving the green channel in the gray position.
image has any pixel where
red != green or red != blue
red_weight: weight of red component
(NULL -> default 54/256)
green_weight: weight of green component
(NULL -> default 183/256)
red_weight: weight of red component times 100000
green_weight: weight of green component times 100000
If either weight is negative, default
weights (21268, 71514) are used.
If you have set error_action = 1 or 2, you can
later check whether the image really was gray, after processing
......@@ -1521,13 +1486,13 @@ It will return a png_byte that is zero if the image was gray or
will be silently converted to grayscale, using the green channel
data, regardless of the error_action setting.
With 0.0<=red_weight+green_weight<=1.0,
With red_weight+green_weight<=100000,
the normalized graylevel is computed:
int rw = red_weight * 256;
int gw = green_weight * 256;
int bw = 256 - (rw + gw);
gray = (rw*red + gw*green + bw*blue)/256;
int rw = red_weight * 65536;
int gw = green_weight * 65536;
int bw = 65536 - (rw + gw);
gray = (rw*red + gw*green + bw*blue)/65536;
The default values approximate those recommended in the Charles
Poynton's Color FAQ, <http://www.inforamp.net/~poynton/>
......@@ -1537,11 +1502,11 @@ Copyright (c) 1998-01-04 Charles Poynton poynton@inforamp.net
Libpng approximates this with
Y = 0.211 * R + 0.715 * G + 0.074 * B
Y = 0.21268 * R + 0.7151 * G + 0.07217 * B
which can be expressed with integers as
Y = (54 * R + 183 * G + 19 * B)/256
Y = (6969 * R + 23434 * G + 2365 * B)/32768
The calculation is done in a linear colorspace, if the image gamma
is known.
......@@ -1672,6 +1637,38 @@ need to change the order the pixels are packed into bytes, you can use:
if (bit_depth < 8)
png_set_packswap(png_ptr);
Finally, you can write your own transformation function if none of
the existing ones meets your needs. This is done by setting a callback
with
png_set_read_user_transform_fn(png_ptr,
read_transform_fn);
You must supply the function
void read_transform_fn(png_ptr ptr, row_info_ptr
row_info, png_bytep data)
See pngtest.c for a working example. Your function will be called
after all of the other transformations have been processed.
You can also set up a pointer to a user structure for use by your
callback function, and you can inform libpng that your transform
function will change the number of channels or bit depth with the
function
png_set_user_transform_info(png_ptr, user_ptr,
user_depth, user_channels);
The user's application, not libpng, is responsible for allocating and
freeing any memory required for the user structure.
You can retrieve the pointer via the function
png_get_user_transform_ptr(). For example:
voidp read_user_transform_ptr =
png_get_user_transform_ptr(png_ptr);
The last thing to handle is interlacing; this is covered in detail below,
but you must call the function here if you want libpng to handle expansion
of the interlaced image.
......@@ -1726,10 +1723,10 @@ interlace_type == PNG_INTERLACE_NONE), this is simple:
where row_pointers is the same as in the png_read_image() call.
If you are doing this just one row at a time, you can do this with
row_pointers:
a single row_pointer instead of an array of row_pointers:
png_bytep row_pointers = row;
png_read_row(png_ptr, &row_pointers, NULL);
png_bytep row_pointer = row;
png_read_row(png_ptr, row_pointers, NULL);
If the file is interlaced (info_ptr->interlace_type != 0), things get
somewhat harder. The only current (PNG Specification version 1.2)
......@@ -1880,7 +1877,7 @@ png_infop info_ptr;
return -1;
}
if (setjmp(png_jmp_env(png_ptr)))
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr,
(png_infopp)NULL);
......@@ -1914,7 +1911,7 @@ png_infop info_ptr;
int
process_data(png_bytep buffer, png_uint_32 length)
{
if (setjmp(png_jmp_env(png_ptr)))
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr,
(png_infopp)NULL);
......@@ -2069,15 +2066,15 @@ png_create_write_struct_2() instead of png_create_read_struct():
After you have these structures, you will need to set up the
error handling. When libpng encounters an error, it expects to
longjmp() back to your routine. Therefore, you will need to call
setjmp() and pass the png_jmp_env(png_ptr). If you
setjmp() and pass the png_jmpbuf(png_ptr). If you
write the file from different routines, you will need to update
the png_jmp_env(png_ptr) every time you enter a new routine that will
call a png_ function. See your documentation of setjmp/longjmp
the png_jmpbuf(png_ptr) every time you enter a new routine that will
call a png_*() function. See your documentation of setjmp/longjmp
for your compiler for more information on setjmp/longjmp. See
the discussion on libpng error handling in the Customizing Libpng
section below for more information on the libpng error handling.
if (setjmp(png_jmp_env(png_ptr)))
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
......@@ -2512,14 +2509,15 @@ make sure to only enable a transformation if it will be valid for the
data. For example, don't swap red and blue on grayscale data.
PNG files store RGB pixels packed into 3 or 6 bytes. This code tells
the library to expand the input data to 4 or 8 bytes per pixel
(or expand 1 or 2-byte grayscale data to 2 or 4 bytes per pixel).
the library to trip input data that has 4 or 8 bytes per pixel down
to 3 or 6 bytes (or strip 2 or 4-byte grayscale+filler data to 1 or 2
bytes per pixel).
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
where the 0 is the value that will be put in the 4th byte, and the
location is either PNG_FILLER_BEFORE or PNG_FILLER_AFTER, depending
upon whether the filler byte is stored XRGB or RGBX.
where the 0 is unused, and the location is either PNG_FILLER_BEFORE or
PNG_FILLER_AFTER, depending upon whether the filler byte in the is stored
XRGB or RGBX.
PNG files pack pixels of bit depths 1, 2, and 4 into bytes as small as
they can, resulting in, for example, 8 pixels per byte for 1 bit files.
......@@ -2636,7 +2634,7 @@ that do not use flushing.
.SS Writing the image data
That's it for the transformations. Now you can write the image data.
The simplest way to do this is in one function call. If have the
The simplest way to do this is in one function call. If you have the
whole image in memory, you can just call png_write_image() and libpng
will write the image. You will need to pass in an array of pointers to
each row. This function automatically handles interlacing, so you don't
......@@ -2661,11 +2659,11 @@ this is simple:
row_pointers is the same as in the png_write_image() call.
If you are just writing one row at a time, you can do this with
row_pointers:
a single row_pointer instead of an array of row_pointers:
png_bytep row_pointer = row;
png_write_row(png_ptr, &row_pointer);
png_write_row(png_ptr, row_pointer);
When the file is interlaced, things can get a good deal more
complicated. The only currently (as of January 2000 -- PNG Specification
......@@ -3115,13 +3113,13 @@ the old method.
.SH VII. Y2K Compliance in libpng
February 18, 2000
March 21, 2000
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.71 and
upward through 1.0.5s are Y2K compliant. It is my belief that earlier
upward through 1.0.6 are Y2K compliant. It is my belief that earlier
versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that
......@@ -3218,7 +3216,7 @@ or at
.br
ftp://ftp.uu.net/pub/archiving/zip/zlib
.br
http://www.cdrom.com/pub/infozip/zlib
ftp://ftp.freesoftware.com/pub/infozip/zlib
.LP
.IR PNG specification: RFC 2083
......@@ -3247,7 +3245,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
Libpng version 1.0.5s - February 18, 2000:
Libpng version 1.0.6 - March 21, 2000:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (randeg@alum.rpi.edu).
......@@ -3262,7 +3260,7 @@ Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
Copyright (c) 1996, 1997 Andreas Dilger
(libpng versions 0.90, December 1996, through 0.96, May 1997)
Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
(libpng versions 0.97, January 1998, through 1.0.5s, February 18, 2000)
(libpng versions 0.97, January 1998, through 1.0.6, March 21, 2000)
For the purposes of this copyright and license, "Contributing Authors"
is defined as the following set of individuals:
......
libpng.txt
浏览文件 @ 520a764c
libpng.txt - A description on how to use and modify libpng
libpng version 1.0.5s - February 18, 2000
libpng version 1.0.6 - March 21, 2000
Updated and distributed by Glenn Randers-Pehrson
<randeg@alum.rpi.edu>
Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
......@@ -37,7 +37,9 @@ Libpng was written as a companion to the PNG specification, as a way
of reducing the amount of time and effort it takes to support the PNG
file format in application programs.
The PNG-1.2 specification is available at <http://www.cdrom.com/png>.
The PNG-1.2 specification is available at <http://www.cdrom.com/pub/png>
(will be moving to <http://www.libpng.org>)
and at <ftp://ftp.uu.net/graphics/png/documents/>.
The PNG-1.0 specification is available
as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> and as a
......@@ -47,7 +49,9 @@ documents at <ftp://ftp.uu.net/graphics/png/documents/>.
Other information
about PNG, and the latest version of libpng, can be found at the PNG home
page, <http://www.cdrom.com/pub/png/>.
page, <http://www.cdrom.com/pub/png/> (will be moving to
<http://www.libpng.org>)
and at <ftp://ftp.uu.net/graphics/png/>.
Most users will not have to modify the library significantly; advanced
users may want to modify it more. All attempts were made to make it as
......@@ -65,7 +69,7 @@ majority of the needs of its users.
Libpng uses zlib for its compression and decompression of PNG files.
Further information about zlib, and the latest version of zlib, can
be found at the zlib home page, <http://www.cdrom.com/pub/infozip/zlib/>.
be found at the zlib home page, <ftp://ftp.freesoftware.com/pub/infozip/zlib/>.
The zlib compression utility is a general purpose utility that is
useful for more than PNG files, and can be used without libpng.
See the documentation delivered with zlib for more details.
......@@ -190,9 +194,9 @@ handling and memory alloc/free functions.
When libpng encounters an error, it expects to longjmp back
to your routine. Therefore, you will need to call setjmp and pass
your png_jmp_env(png_ptr). If you read the file from different
your png_jmpbuf(png_ptr). If you read the file from different
routines, you will need to update the jmpbuf field every time you enter
a new routine that will call a png_ function.
a new routine that will call a png_*() function.
See your documentation of setjmp/longjmp for your compiler for more
information on setjmp/longjmp. See the discussion on libpng error
......@@ -201,7 +205,7 @@ on the libpng error handling. If an error occurs, and libpng longjmp's
back to your setjmp, you will want to call png_destroy_read_struct() to
free any memory.
if (setjmp(png_jmp_env(png_ptr)))
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr,
&end_info);
......@@ -281,38 +285,6 @@ To inform libpng about your function, use
png_set_read_status_fn(png_ptr, read_row_callback);
Finally, you can write your own transformation function if none of
the existing ones meets your needs. This is done by setting a callback
with
png_set_read_user_transform_fn(png_ptr,
read_transform_fn);
You must supply the function
void read_transform_fn(png_ptr ptr, row_info_ptr
row_info, png_bytep data)
See pngtest.c for a working example. Your function will be called
after all of the other transformations have been processed.
You can also set up a pointer to a user structure for use by your
callback function, and you can inform libpng that your transform
function will change the number of channels or bit depth with the
function
png_set_user_transform_info(png_ptr, user_ptr,
user_depth, user_channels);
The user's application, not libpng, is responsible for allocating and
freeing any memory required for the user structure.
You can retrieve the pointer via the function
png_get_user_transform_ptr(). For example:
voidp read_user_transform_ptr =
png_get_user_transform_ptr(png_ptr);
Unknown-chunk handling
Now you get to set the way the library processes unknown chunks in the
......@@ -384,24 +356,6 @@ call to png_read_info().
This will process all chunks up to but not including the image data.
There is one transformation you may need to set up before doing
png_read_info(), however. In PNG files, the alpha channel in an image
is the level of opacity. If you need the alpha channel in an image to
be the level of transparency instead of opacity, you can invert the
alpha channel (or the tRNS chunk data) after it's read, so that 0 is
fully opaque and 255 (in 8-bit or paletted images) or 65535 (in 16-bit
images) is fully transparent, with
png_set_invert_alpha(png_ptr);
This must appear before png_write_info() instead of later with the
other transformations because in the case of paletted images the tRNS
chunk data has to be inverted before the tRNS chunk is written.
If your image is not a paletted image, the tRNS data (which in such cases
represents a single color to be rendered as transparent) won't need to
be changed, and you can safely do this transformation after your
png_read_info() call.
Querying the info structure
Functions are used to get the information from the info_ptr once it
......@@ -728,6 +682,15 @@ it with the background, so that's what you should probably do):
if (color_type & PNG_COLOR_MASK_ALPHA)
png_set_strip_alpha(png_ptr);
In PNG files, the alpha channel in an image
is the level of opacity. If you need the alpha channel in an image to
be the level of transparency instead of opacity, you can invert the
alpha channel (or the tRNS chunk data) after it's read, so that 0 is
fully opaque and 255 (in 8-bit or paletted images) or 65535 (in 16-bit
images) is fully transparent, with
png_set_invert_alpha(png_ptr);
PNG files pack pixels of bit depths 1, 2, and 4 into bytes as small as
they can, resulting in, for example, 8 pixels per byte for 1 bit
files. This code expands to 1 pixel per byte without changing the
......@@ -781,14 +744,12 @@ RGB. This code will do that conversion:
png_set_gray_to_rgb(png_ptr);
Conversely, you can convert an RGB or RGBA image to grayscale or grayscale
with alpha. This is intended for conversion of images that really are
gray (red == green == blue), so the function simply strips out the red
and blue channels, leaving the green channel in the gray position.
with alpha.
if (color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA)
png_set_rgb_to_gray(png_ptr, error_action,
double red_weight, double green_weight);
png_set_rgb_to_gray_fixed(png_ptr, error_action,
int red_weight, int green_weight);
error_action = 1: silently do the conversion
error_action = 2: issue a warning if the original
......@@ -799,10 +760,10 @@ and blue channels, leaving the green channel in the gray position.
image has any pixel where
red != green or red != blue
red_weight: weight of red component
(NULL -> default 54/256)
green_weight: weight of green component
(NULL -> default 183/256)
red_weight: weight of red component times 100000
green_weight: weight of green component times 100000
If either weight is negative, default
weights (21268, 71514) are used.
If you have set error_action = 1 or 2, you can
later check whether the image really was gray, after processing
......@@ -812,13 +773,13 @@ It will return a png_byte that is zero if the image was gray or
will be silently converted to grayscale, using the green channel
data, regardless of the error_action setting.
With 0.0<=red_weight+green_weight<=1.0,
With red_weight+green_weight<=100000,
the normalized graylevel is computed:
int rw = red_weight * 256;
int gw = green_weight * 256;
int bw = 256 - (rw + gw);
gray = (rw*red + gw*green + bw*blue)/256;
int rw = red_weight * 65536;
int gw = green_weight * 65536;
int bw = 65536 - (rw + gw);
gray = (rw*red + gw*green + bw*blue)/65536;
The default values approximate those recommended in the Charles
Poynton's Color FAQ, <http://www.inforamp.net/~poynton/>
......@@ -828,11 +789,11 @@ Copyright (c) 1998-01-04 Charles Poynton poynton@inforamp.net
Libpng approximates this with
Y = 0.211 * R + 0.715 * G + 0.074 * B
Y = 0.21268 * R + 0.7151 * G + 0.07217 * B
which can be expressed with integers as
Y = (54 * R + 183 * G + 19 * B)/256
Y = (6969 * R + 23434 * G + 2365 * B)/32768
The calculation is done in a linear colorspace, if the image gamma
is known.
......@@ -963,6 +924,38 @@ need to change the order the pixels are packed into bytes, you can use:
if (bit_depth < 8)
png_set_packswap(png_ptr);
Finally, you can write your own transformation function if none of
the existing ones meets your needs. This is done by setting a callback
with
png_set_read_user_transform_fn(png_ptr,
read_transform_fn);
You must supply the function
void read_transform_fn(png_ptr ptr, row_info_ptr
row_info, png_bytep data)
See pngtest.c for a working example. Your function will be called
after all of the other transformations have been processed.
You can also set up a pointer to a user structure for use by your
callback function, and you can inform libpng that your transform
function will change the number of channels or bit depth with the
function
png_set_user_transform_info(png_ptr, user_ptr,
user_depth, user_channels);
The user's application, not libpng, is responsible for allocating and
freeing any memory required for the user structure.
You can retrieve the pointer via the function
png_get_user_transform_ptr(). For example:
voidp read_user_transform_ptr =
png_get_user_transform_ptr(png_ptr);
The last thing to handle is interlacing; this is covered in detail below,
but you must call the function here if you want libpng to handle expansion
of the interlaced image.
......@@ -1017,10 +1010,10 @@ interlace_type == PNG_INTERLACE_NONE), this is simple:
where row_pointers is the same as in the png_read_image() call.
If you are doing this just one row at a time, you can do this with
row_pointers:
a single row_pointer instead of an array of row_pointers:
png_bytep row_pointers = row;
png_read_row(png_ptr, &row_pointers, NULL);
png_bytep row_pointer = row;
png_read_row(png_ptr, row_pointers, NULL);
If the file is interlaced (info_ptr->interlace_type != 0), things get
somewhat harder. The only current (PNG Specification version 1.2)
......@@ -1171,7 +1164,7 @@ png_infop info_ptr;
return -1;
}
if (setjmp(png_jmp_env(png_ptr)))
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr,
(png_infopp)NULL);
......@@ -1205,7 +1198,7 @@ png_infop info_ptr;
int
process_data(png_bytep buffer, png_uint_32 length)
{
if (setjmp(png_jmp_env(png_ptr)))
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr,
(png_infopp)NULL);
......@@ -1360,15 +1353,15 @@ png_create_write_struct_2() instead of png_create_read_struct():
After you have these structures, you will need to set up the
error handling. When libpng encounters an error, it expects to
longjmp() back to your routine. Therefore, you will need to call
setjmp() and pass the png_jmp_env(png_ptr). If you
setjmp() and pass the png_jmpbuf(png_ptr). If you
write the file from different routines, you will need to update
the png_jmp_env(png_ptr) every time you enter a new routine that will
call a png_ function. See your documentation of setjmp/longjmp
the png_jmpbuf(png_ptr) every time you enter a new routine that will
call a png_*() function. See your documentation of setjmp/longjmp
for your compiler for more information on setjmp/longjmp. See
the discussion on libpng error handling in the Customizing Libpng
section below for more information on the libpng error handling.
if (setjmp(png_jmp_env(png_ptr)))
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(fp);
......@@ -1803,14 +1796,15 @@ make sure to only enable a transformation if it will be valid for the
data. For example, don't swap red and blue on grayscale data.
PNG files store RGB pixels packed into 3 or 6 bytes. This code tells
the library to expand the input data to 4 or 8 bytes per pixel
(or expand 1 or 2-byte grayscale data to 2 or 4 bytes per pixel).
the library to trip input data that has 4 or 8 bytes per pixel down
to 3 or 6 bytes (or strip 2 or 4-byte grayscale+filler data to 1 or 2
bytes per pixel).
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
where the 0 is the value that will be put in the 4th byte, and the
location is either PNG_FILLER_BEFORE or PNG_FILLER_AFTER, depending
upon whether the filler byte is stored XRGB or RGBX.
where the 0 is unused, and the location is either PNG_FILLER_BEFORE or
PNG_FILLER_AFTER, depending upon whether the filler byte in the is stored
XRGB or RGBX.
PNG files pack pixels of bit depths 1, 2, and 4 into bytes as small as
they can, resulting in, for example, 8 pixels per byte for 1 bit files.
......@@ -1927,7 +1921,7 @@ that do not use flushing.
Writing the image data
That's it for the transformations. Now you can write the image data.
The simplest way to do this is in one function call. If have the
The simplest way to do this is in one function call. If you have the
whole image in memory, you can just call png_write_image() and libpng
will write the image. You will need to pass in an array of pointers to
each row. This function automatically handles interlacing, so you don't
......@@ -1952,11 +1946,11 @@ this is simple:
row_pointers is the same as in the png_write_image() call.
If you are just writing one row at a time, you can do this with
row_pointers:
a single row_pointer instead of an array of row_pointers:
png_bytep row_pointer = row;
png_write_row(png_ptr, &row_pointer);
png_write_row(png_ptr, row_pointer);
When the file is interlaced, things can get a good deal more
complicated. The only currently (as of January 2000 -- PNG Specification
......@@ -2406,13 +2400,13 @@ the old method.
VII. Y2K Compliance in libpng
February 18, 2000
March 21, 2000
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.71 and
upward through 1.0.5s are Y2K compliant. It is my belief that earlier
upward through 1.0.6 are Y2K compliant. It is my belief that earlier
versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that
......
libpngpf.3
浏览文件 @ 520a764c
.TH LIBPNGPF 3 February 18, 2000
.TH LIBPNGPF 3 March 21, 2000
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5s
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.6
(private functions)
.SH SYNOPSIS
\fB#include <png.h>\fP
......
png.5
浏览文件 @ 520a764c
.TH PNG 5 "February 18, 2000"
.TH PNG 5 "March 21, 2000"
.SH NAME
png \- Portable Network Graphics (PNG) format
.SH DESCRIPTION
......@@ -23,7 +23,9 @@ platforms.
PNG 1.2 specification, July 1999:
.IP
.br
http://www.cdrom.com/pub/png
http://www.cdrom.com/pub/png (moving to http://www.libpng.org)
.br
or ftp://ftp.uu.net/graphics/png/documents
.LP
PNG 1.0 specification, October 1996:
.IP
......
png.c
浏览文件 @ 520a764c
/* png.c - location for general purpose libpng functions
*
* libpng version 1.0.5s - February 18, 2000
* libpng version 1.0.6 - March 21, 2000
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
......@@ -13,13 +13,15 @@
#include <assert.h>
#include "png.h"
/* Generate a compiler error if there is an old png.h in the search path. */
typedef version_1_0_6 Your_png_h_is_not_version_1_0_6;
/* Version information for C files. This had better match the version
* string defined in png.h.
*/
* string defined in png.h. */
#ifdef PNG_USE_GLOBAL_ARRAYS
/* png_libpng_ver was changed to a function in version 1.0.5c */
char png_libpng_ver[12] = "1.0.5s";
char png_libpng_ver[12] = "1.0.6";
/* png_sig was changed to a function in version 1.0.5c */
/* Place to hold the signature string for a PNG file. */
......@@ -543,7 +545,7 @@ png_charp
png_get_copyright(png_structp png_ptr)
{
if (png_ptr != NULL || png_ptr == NULL) /* silence compiler warning */
return ("\n libpng version 1.0.5s - February 18, 2000\n\
return ("\n libpng version 1.0.6 - March 21, 2000\n\
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n\
Copyright (c) 1996, 1997 Andreas Dilger\n\
Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson\n");
......@@ -561,8 +563,8 @@ png_get_libpng_ver(png_structp png_ptr)
{
/* Version of *.c files used when building libpng */
if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
return("1.0.5s");
return("1.0.5s");
return("1.0.6");
return("1.0.6");
}
png_charp
......@@ -583,15 +585,6 @@ png_get_header_version(png_structp png_ptr)
return(PNG_HEADER_VERSION_STRING);
}
/* Generate a compiler error if there is an old png.h in the search path. */
void
png_check_version
(version_1_0_5s png_h_is_not_version_1_0_5s)
{
if(png_h_is_not_version_1_0_5s == NULL)
return;
}
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
int
png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
......
png.h
浏览文件 @ 520a764c
/* png.h - header file for PNG reference library
*
* libpng version 1.0.5s - February 18, 2000
* libpng version 1.0.6 - March 21, 2000
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
......@@ -9,63 +9,9 @@
* Authors and maintainers:
* libpng versions 0.71, May 1995, through 0.89c, May 1996: Guy Schalnat
* libpng versions 0.90, December 1996, through 0.96, May 1997: Andreas Dilger
* libpng versions 0.97, January 1998, through 1.0.5s - February 18, 2000: Glenn
* libpng versions 0.97, January 1998, through 1.0.6 - March 21, 2000: Glenn
* See also "Contributing Authors", below.
*
* Y2K compliance in libpng:
* =========================
*
* February 18, 2000
*
* Since the PNG Development group is an ad-hoc body, we can't make
* an official declaration.
*
* This is your unofficial assurance that libpng from version 0.71 and
* upward through 1.0.5s are Y2K compliant. It is my belief that earlier
* versions were also Y2K compliant.
*
* Libpng only has three year fields. One is a 2-byte unsigned integer
* that will hold years up to 65535. The other two hold the date in text
* format, and will hold years up to 9999.
*
* The integer is
* "png_uint_16 year" in png_time_struct.
*
* The strings are
* "png_charp time_buffer" in png_struct and
* "near_time_buffer", which is a local character string in png.c.
*
* There are seven time-related functions:
* png.c: png_convert_to_rfc_1123() in png.c
* (formerly png_convert_to_rfc_1152() in error)
* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
* png_convert_from_time_t() in pngwrite.c
* png_get_tIME() in pngget.c
* png_handle_tIME() in pngrutil.c, called in pngread.c
* png_set_tIME() in pngset.c
* png_write_tIME() in pngwutil.c, called in pngwrite.c
*
* All handle dates properly in a Y2K environment. The
* png_convert_from_time_t() function calls gmtime() to convert from system
* clock time, which returns (year - 1900), which we properly convert to
* the full 4-digit year. There is a possibility that applications using
* libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
* function, or that they are incorrectly passing only a 2-digit year
* instead of "year - 1900" into the png_convert_from_struct_tm() function,
* but this is not under our control. The libpng documentation has always
* stated that it works with 4-digit years, and the APIs have been
* documented as such.
*
* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
* integer to hold the year, and can hold years as large as 65535.
*
* zlib, upon which libpng depends, is also Y2K compliant. It contains
* no date-related code.
*
* Glenn Randers-Pehrson
* libpng maintainer
* PNG Development Group
*
* Note about libpng version numbers:
*
* Due to various miscommunications, unforeseen code incompatibilities
......@@ -99,7 +45,8 @@
* 1.0.5 1.0.5 10005 2.1.0.5
* 1.0.5a-d 1.0.5a-d 10006 2.1.0.5a-d
* 1.0.5e-r 1.0.5e-r 10100 2.1.0.5e-r (not compatible)
* 1.0.5s 1.0.5s 10006 2.1.0.5s (compatible)
* 1.0.5s-v 1.0.5s-v 10006 2.1.0.5s-w (compatible)
* 1.0.6 1.0.6 10006 2.1.0.6
* 1.3.0 1.3.0 10300 3.1.3.0
*
* Henceforth the source version will match the shared-library minor
......@@ -124,7 +71,7 @@
* Copyright (c) 1996, 1997 Andreas Dilger
* (libpng versions 0.90, December 1996, through 0.96, May 1997)
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
* (libpng versions 0.97, January 1998, through 1.0.5s, February 18, 2000)
* (libpng versions 0.97, January 1998, through 1.0.6, March 21, 2000)
*
* For the purposes of this copyright and license, "Contributing Authors"
* is defined as the following set of individuals:
......@@ -157,16 +104,13 @@
* source code, or portions hereof, for any purpose, without fee, subject
* to the following restrictions:
*
* 1. The origin of this source code must not be
* misrepresented.
* 1. The origin of this source code must not be misrepresented.
*
* 2. Altered versions must be plainly marked as such
* and must not be misrepresented as being the
* original source.
* 2. Altered versions must be plainly marked as such and must not
* be misrepresented as being the original source.
*
* 3. This Copyright notice may not be removed or
* altered from any source or altered source
* distribution.
* 3. This Copyright notice may not be removed or altered from any
* source or altered source distribution.
*
* The Contributing Authors and Group 42, Inc. specifically permit, without
* fee, and encourage the use of this source code as a component to
......@@ -198,6 +142,62 @@
* Thanks to Frank J. T. Wojcik for helping with the documentation.
*/
/*
* Y2K compliance in libpng:
* =========================
*
* March 21, 2000
*
* Since the PNG Development group is an ad-hoc body, we can't make
* an official declaration.
*
* This is your unofficial assurance that libpng from version 0.71 and
* upward through 1.0.6 are Y2K compliant. It is my belief that earlier
* versions were also Y2K compliant.
*
* Libpng only has three year fields. One is a 2-byte unsigned integer
* that will hold years up to 65535. The other two hold the date in text
* format, and will hold years up to 9999.
*
* The integer is
* "png_uint_16 year" in png_time_struct.
*
* The strings are
* "png_charp time_buffer" in png_struct and
* "near_time_buffer", which is a local character string in png.c.
*
* There are seven time-related functions:
* png.c: png_convert_to_rfc_1123() in png.c
* (formerly png_convert_to_rfc_1152() in error)
* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
* png_convert_from_time_t() in pngwrite.c
* png_get_tIME() in pngget.c
* png_handle_tIME() in pngrutil.c, called in pngread.c
* png_set_tIME() in pngset.c
* png_write_tIME() in pngwutil.c, called in pngwrite.c
*
* All handle dates properly in a Y2K environment. The
* png_convert_from_time_t() function calls gmtime() to convert from system
* clock time, which returns (year - 1900), which we properly convert to
* the full 4-digit year. There is a possibility that applications using
* libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
* function, or that they are incorrectly passing only a 2-digit year
* instead of "year - 1900" into the png_convert_from_struct_tm() function,
* but this is not under our control. The libpng documentation has always
* stated that it works with 4-digit years, and the APIs have been
* documented as such.
*
* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
* integer to hold the year, and can hold years as large as 65535.
*
* zlib, upon which libpng depends, is also Y2K compliant. It contains
* no date-related code.
*
* Glenn Randers-Pehrson
* libpng maintainer
* PNG Development Group
*/
#ifndef _PNG_H
#define _PNG_H
......@@ -230,7 +230,7 @@ extern "C" {
*/
/* Version information for png.h - this should match the version in png.c */
#define PNG_LIBPNG_VER_STRING "1.0.5s"
#define PNG_LIBPNG_VER_STRING "1.0.6"
/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
* We must not include leading zeros.
......@@ -310,26 +310,26 @@ typedef png_color_8 FAR * FAR * png_color_8pp;
* The following two structures are used for the in-core representation
* of sPLT chunks.
*/
typedef struct png_spalette_entry_struct
typedef struct png_sPLT_entry_struct
{
png_uint_16 red;
png_uint_16 green;
png_uint_16 blue;
png_uint_16 alpha;
png_uint_16 frequency;
} png_spalette_entry;
typedef png_spalette_entry FAR * png_spalette_entryp;
typedef png_spalette_entry FAR * FAR * png_spalette_entrypp;
} png_sPLT_entry;
typedef png_sPLT_entry FAR * png_sPLT_entryp;
typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
typedef struct png_spalette_struct
typedef struct png_sPLT_struct
{
png_charp name; /* palette name */
png_byte depth; /* depth of palette samples */
png_spalette_entryp entries; /* palette entries */
png_sPLT_entryp entries; /* palette entries */
png_int_32 nentries; /* number of palette entries */
} png_spalette;
typedef png_spalette FAR * png_spalette_p;
typedef png_spalette FAR * FAR * png_spalette_pp;
} png_sPLT_t;
typedef png_sPLT_t FAR * png_sPLT_tp;
typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
#ifdef PNG_TEXT_SUPPORTED
/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
......@@ -635,7 +635,7 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
#if defined(PNG_sPLT_SUPPORTED)
/* data on sPLT chunks (there may be more than one). */
png_spalette_p splt_palettes;
png_sPLT_tp splt_palettes;
png_uint_32 splt_palettes_num;
#endif
......@@ -1039,9 +1039,9 @@ struct png_struct_def
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
png_byte rgb_to_gray_status;
png_byte rgb_to_gray_red_coeff;
png_byte rgb_to_gray_green_coeff;
png_byte rgb_to_gray_blue_coeff;
png_uint_16 rgb_to_gray_red_coeff;
png_uint_16 rgb_to_gray_green_coeff;
png_uint_16 rgb_to_gray_blue_coeff;
#endif
#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
......@@ -1056,9 +1056,9 @@ struct png_struct_def
};
/* This prevents a compiler error in png_get_copyright() in png.c if png.c
and png.h are both at * version 1.0.5s
and png.h are both at * version 1.0.6
*/
typedef png_structp version_1_0_5s;
typedef png_structp version_1_0_6;
typedef png_struct FAR * FAR * png_structpp;
......@@ -1179,6 +1179,8 @@ extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
int error_action, double red, double green ));
#endif
extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
int error_action, png_fixed_point red, png_fixed_point green ));
extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
png_ptr));
#endif
......@@ -1887,12 +1889,12 @@ extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
#if defined(PNG_READ_sPLT_SUPPORTED)
extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_spalette_pp entries));
png_infop info_ptr, png_sPLT_tpp entries));
#endif
#if defined(PNG_sPLT_SUPPORTED)
extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_spalette_p entries, int nentries));
png_infop info_ptr, png_sPLT_tp entries, int nentries));
#endif
#if defined(PNG_TEXT_SUPPORTED)
......@@ -2029,7 +2031,7 @@ extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)
extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
#define PNG_HEADER_VERSION_STRING \
" libpng version 1.0.5s - February 18, 2000 (header)\n"
" libpng version 1.0.6 - March 21, 2000 (header)\n"
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
/* With these routines we avoid an integer divide, which will be slower on
......@@ -2083,7 +2085,6 @@ extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
/* Various modes of operation. Note that after an init, mode is set to
* zero automatically when the structure is created.
*/
#define PNG_BEFORE_IHDR 0x00
#define PNG_HAVE_IHDR 0x01
#define PNG_HAVE_PLTE 0x02
#define PNG_HAVE_IDAT 0x04
......@@ -2404,7 +2405,7 @@ PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
#if defined(PNG_WRITE_sPLT_SUPPORTED)
PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
png_spalette_p palette));
png_sPLT_tp palette));
#endif
#if defined(PNG_WRITE_tRNS_SUPPORTED)
......
pngasmrd.h
浏览文件 @ 520a764c
/* pngasmrd.h - assembler version of utilities to read a PNG file
*
* libpng 1.0.5s - February 18, 2000
* libpng 1.0.6 - March 21, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1999, 2000 Glenn Randers-Pehrson
*
......
pngconf.h
浏览文件 @ 520a764c
/* pngconf.h - machine configurable file for libpng
*
* libpng 1.0.5s - February 18, 2000
* libpng 1.0.6 - March 21, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
......@@ -441,9 +441,14 @@
* but might be required for some pre-1.0.5c applications.
*/
#ifdef PNG_NO_GLOBAL_ARRAYS
#define PNG_USE_LOCAL_ARRAYS
# define PNG_USE_LOCAL_ARRAYS
#else
#define PNG_USE_GLOBAL_ARRAYS
# if defined(__GNUC__) && defined(WIN32)
# define PNG_NO_GLOBAL_ARRAYS
# define PNG_USE_LOCAL_ARRAYS
# else
# define PNG_USE_GLOBAL_ARRAYS
# endif
#endif
/* These are currently experimental features, define them if you want */
......@@ -913,7 +918,10 @@ typedef z_stream FAR * png_zstreamp;
#endif
#ifdef PNG_SETJMP_SUPPORTED
# define png_jmp_env(png_ptr) png_ptr->jmpbuf
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#else
# define png_jmpbuf(png_ptr) \
(LIBPNG_WAS_COMPILED_WITH__PNG_SETJMP_NOT_SUPPORTED)
#endif
#if defined(USE_FAR_KEYWORD) /* memory model independent fns */
......
pngerror.c
浏览文件 @ 520a764c
/* pngerror.c - stub functions for i/o and memory allocation
*
* libpng 1.0.5s - February 18, 2000
* libpng 1.0.6 - March 21, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
......
pnggccrd.c
浏览文件 @ 520a764c
......@@ -6,7 +6,7 @@
* and http://www.intel.com/drg/pentiumII/appnotes/923/923.htm
* for Intel's performance analysis of the MMX vs. non-MMX code.
*
* libpng 1.0.5s - February 18, 2000
* libpng 1.0.6 - March 21, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998, Intel Corporation
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
......@@ -25,14 +25,15 @@
* is required to assemble the newer MMX instructions such as movq.
* For djgpp, see
*
* ftp://ftp.cdrom.com/pub/simtelnet/gnu/djgpp/v2gnu/bnu281b.zip
* ftp://ftp.simtel.net/pub/simtelnet/gnu/djgpp/v2gnu/bnu281b.zip
*
* (or a later version in the same directory). For Linux, check your
* distribution's web site(s) or try these links:
*
* http://rufus.w3.org/linux/RPM/binutils.html
* http://www.debian.org/Packages/stable/devel/binutils.html
* ftp://ftp.cdrom.com/pub/linux/slackware/slakware/d1/binutils.tgz
* ftp://ftp.slackware.com/pub/linux/slackware/slackware/slakware/d1/
* binutils.tgz
*
* For other platforms, see the main GNU site:
*
......@@ -40,85 +41,92 @@
*
* Version 2.5.2l.15 is definitely too old...
*/
#if 0
// GRR NOTES
//
// 19991006:
// - fixed sign error in post-MMX cleanup code (16- & 32-bit cases)
//
// 19991007:
// - additional optimizations (possible or definite):
// x [DONE] write MMX code for 64-bit case (pixel_bytes == 8) [not tested]
// - write MMX code for 48-bit case (pixel_bytes == 6)
// - figure out what's up with 24-bit case (pixel_bytes == 3):
// why subtract 8 from width_mmx in the pass 4/5 case?
// (only width_mmx case)
// x [DONE] replace pixel_bytes within each block with the true
// constant value (or are compilers smart enough to do that?)
// - rewrite all MMX interlacing code so it's aligned with
// the *beginning* of the row buffer, not the end. This
// would not only allow one to eliminate half of the memory
// writes for odd passes (i.e., pass == odd), it may also
// eliminate some unaligned-data-access exceptions (assuming
// there's a penalty for not aligning 64-bit accesses on
// 64-bit boundaries). The only catch is that the "leftover"
// pixel(s) at the end of the row would have to be saved,
// but there are enough unused MMX registers in every case,
// so this is not a problem. A further benefit is that the
// post-MMX cleanup code (C code) in at least some of the
// cases could be done within the assembler block.
// x [DONE] the "v3 v2 v1 v0 v7 v6 v5 v4" comments are confusing,
// inconsistent, and don't match the MMX Programmer's Reference
// Manual conventions anyway. They should be changed to
// "b7 b6 b5 b4 b3 b2 b1 b0," where b0 indicates the byte that
// was lowest in memory (e.g., corresponding to a left pixel)
// and b7 is the byte that was highest (e.g., a right pixel).
//
// 19991016:
// - Brennan's Guide notwithstanding, gcc under Linux does *not*
// want globals prefixed by underscores when referencing them--
// i.e., if the variable is const4, then refer to it as const4,
// not _const4. This seems to be a djgpp-specific requirement.
// Also, such variables apparently *must* be declared outside
// of functions; neither static nor automatic variables work if
// defined within the scope of a single function, but both
// static and truly global (multi-module) variables work fine.
//
// 19991023:
// - fixed png_combine_row() non-MMX replication bug (odd passes only?)
// - switched from string-concatenation-with-macros to cleaner method of
// renaming global variables for djgpp--i.e., always use prefixes in
// inlined assembler code (== strings) and conditionally rename the
// variables, not the other way around. Hence _const4, _mask8_0, etc.
//
// 19991024:
// - fixed mmxsupport()/png_do_interlace() first-row bug
// This one was severely weird: even though mmxsupport() doesn't touch
// ebx (where "row" pointer was stored), it nevertheless managed to zero
// the register (even in static/non-fPIC code--see below), which in turn
// caused png_do_interlace() to return prematurely on the first row of
// interlaced images (i.e., without expanding the interlaced pixels).
// Inspection of the generated assembly code didn't turn up any clues,
// although it did point at a minor optimization (i.e., get rid of
// mmx_supported_local variable and just use eax). Possibly the CPUID
// instruction is more destructive than it looks? (Not yet checked.)
// - "info gcc" was next to useless, so compared fPIC and non-fPIC assembly
// listings... Apparently register spillage has to do with ebx, since
// it's used to index the global offset table. Commenting it out of the
// input-reg lists in png_combine_row() eliminated compiler barfage, so
// ifdef'd with __PIC__ macro: if defined, use a global for unmask
//
// 19991107:
// - verified CPUID clobberage: 12-char string constant ("GenuineIntel",
// "AuthenticAMD", etc.) placed in EBX:ECX:EDX. Still need to polish.
//
// 19991120:
// - made "diff" variable (now "_dif") global to simplify conversion of
// filtering routines (running out of regs, sigh). "diff" is still used
// in interlacing routines, however.
// - fixed up both versions of mmxsupport() (ORIG_THAT_USED_TO_CLOBBER_EBX
// macro determines which is used); original not yet tested.
#endif
/*
* GRR NOTES
* =========
*
* 19991006:
* - fixed sign error in post-MMX cleanup code (16- & 32-bit cases)
*
* 19991007:
* - additional optimizations (possible or definite):
* x [DONE] write MMX code for 64-bit case (pixel_bytes == 8) [not tested]
* - write MMX code for 48-bit case (pixel_bytes == 6)
* - figure out what's up with 24-bit case (pixel_bytes == 3):
* why subtract 8 from width_mmx in the pass 4/5 case?
* (only width_mmx case)
* x [DONE] replace pixel_bytes within each block with the true
* constant value (or are compilers smart enough to do that?)
* - rewrite all MMX interlacing code so it's aligned with
* the *beginning* of the row buffer, not the end. This
* would not only allow one to eliminate half of the memory
* writes for odd passes (i.e., pass == odd), it may also
* eliminate some unaligned-data-access exceptions (assuming
* there's a penalty for not aligning 64-bit accesses on
* 64-bit boundaries). The only catch is that the "leftover"
* pixel(s) at the end of the row would have to be saved,
* but there are enough unused MMX registers in every case,
* so this is not a problem. A further benefit is that the
* post-MMX cleanup code (C code) in at least some of the
* cases could be done within the assembler block.
* x [DONE] the "v3 v2 v1 v0 v7 v6 v5 v4" comments are confusing,
* inconsistent, and don't match the MMX Programmer's Reference
* Manual conventions anyway. They should be changed to
* "b7 b6 b5 b4 b3 b2 b1 b0," where b0 indicates the byte that
* was lowest in memory (e.g., corresponding to a left pixel)
* and b7 is the byte that was highest (e.g., a right pixel).
*
* 19991016:
* - Brennan's Guide notwithstanding, gcc under Linux does *not*
* want globals prefixed by underscores when referencing them--
* i.e., if the variable is const4, then refer to it as const4,
* not _const4. This seems to be a djgpp-specific requirement.
* Also, such variables apparently *must* be declared outside
* of functions; neither static nor automatic variables work if
* defined within the scope of a single function, but both
* static and truly global (multi-module) variables work fine.
*
* 19991023:
* - fixed png_combine_row() non-MMX replication bug (odd passes only?)
* - switched from string-concatenation-with-macros to cleaner method of
* renaming global variables for djgpp--i.e., always use prefixes in
* inlined assembler code (== strings) and conditionally rename the
* variables, not the other way around. Hence _const4, _mask8_0, etc.
*
* 19991024:
* - fixed mmxsupport()/png_do_interlace() first-row bug
* This one was severely weird: even though mmxsupport() doesn't touch
* ebx (where "row" pointer was stored), it nevertheless managed to zero
* the register (even in static/non-fPIC code--see below), which in turn
* caused png_do_interlace() to return prematurely on the first row of
* interlaced images (i.e., without expanding the interlaced pixels).
* Inspection of the generated assembly code didn't turn up any clues,
* although it did point at a minor optimization (i.e., get rid of
* mmx_supported_local variable and just use eax). Possibly the CPUID
* instruction is more destructive than it looks? (Not yet checked.)
* - "info gcc" was next to useless, so compared fPIC and non-fPIC assembly
* listings... Apparently register spillage has to do with ebx, since
* it's used to index the global offset table. Commenting it out of the
* input-reg lists in png_combine_row() eliminated compiler barfage, so
* ifdef'd with __PIC__ macro: if defined, use a global for unmask
*
* 19991107:
* - verified CPUID clobberage: 12-char string constant ("GenuineIntel",
* "AuthenticAMD", etc.) placed in EBX:ECX:EDX. Still need to polish.
*
* 19991120:
* - made "diff" variable (now "_dif") global to simplify conversion of
* filtering routines (running out of regs, sigh). "diff" is still used
* in interlacing routines, however.
* - fixed up both versions of mmxsupport() (ORIG_THAT_USED_TO_CLOBBER_EBX
* macro determines which is used); original not yet tested.
*
* 20000319:
* - fixed a register-name typo in png_do_read_interlace(), default (MMX) case,
* pass == 4 or 5, that caused visible corruption of interlaced images
*/
#define PNG_INTERNAL
#include "png.h"
......@@ -1524,17 +1532,20 @@ fflush(stderr);
width -= width_mmx; // 8 or 9 pix, 24 or 27 bytes
if (width_mmx)
{
// png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
// sptr points at last pixel in pre-expanded row
// dp points at last pixel position in expanded row
__asm__ (
"subl $3, %%esi \n\t"
"subl $9, %%edi \n\t"
// (png_pass_inc[pass] - 1)*pixel_bytes
// (png_pass_inc[pass] + 1)*pixel_bytes
".loop3_pass4: \n\t"
"movq (%%esi), %%mm0 \n\t" // x x 5 4 3 2 1 0
"movq %%mm0, %%mm1 \n\t" // x x 5 4 3 2 1 0
"movq %%mm0, %%mm2 \n\t" // x x 5 4 3 2 1 0
"psllq $24, %%mm0 \n\t" // 4 3 2 1 0 z z z
"pand _const4, %%mm0 \n\t" // z z z z z 2 1 0
"pand _const4, %%mm1 \n\t" // z z z z z 2 1 0
"psrlq $24, %%mm2 \n\t" // z z z x x 5 4 3
"por %%mm1, %%mm0 \n\t" // 4 3 2 1 0 2 1 0
"movq %%mm2, %%mm3 \n\t" // z z z x x 5 4 3
......
pngget.c
浏览文件 @ 520a764c
/* pngget.c - retrieval of values from info struct
*
* libpng 1.0.5s - February 18, 2000
* libpng 1.0.6 - March 21, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
......@@ -489,7 +489,7 @@ png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
#if defined(PNG_READ_sPLT_SUPPORTED)
png_uint_32
png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
png_spalette_pp spalettes)
png_sPLT_tpp spalettes)
{
if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
*spalettes = info_ptr->splt_palettes;
......
pngmem.c
浏览文件 @ 520a764c
/* pngmem.c - stub functions for memory allocation
*
* libpng 1.0.5s - February 18, 2000
* libpng 1.0.6 - March 21, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
......
pngpread.c
浏览文件 @ 520a764c
/* pngpread.c - read a png file in push mode
*
* libpng 1.0.5s - February 18, 2000
* libpng 1.0.6 - March 21, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
......@@ -952,7 +952,7 @@ png_read_push_finish_row(png_structp png_ptr)
void
png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
{
png_error(png_ptr, "Out of place tEXt");
/* to quiet some compiler warnings */
......@@ -1040,7 +1040,7 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
void
png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
{
png_error(png_ptr, "Out of place zTXt");
/* to quiet some compiler warnings */
......@@ -1221,7 +1221,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
void
png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
{
png_error(png_ptr, "Out of place iTXt");
/* to quiet some compiler warnings */
......@@ -1268,7 +1268,7 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
{
png_textp text_ptr;
png_charp key;
int comp_flag = 0;
int comp_flag;
png_charp lang;
png_charp lang_key;
png_charp text;
......
pngread.c
浏览文件 @ 520a764c
/* pngread.c - read a PNG file
*
* libpng 1.0.5s - February 18, 2000
* libpng 1.0.6 - March 21, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
......@@ -641,7 +641,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
* not called png_set_interlace_handling(), the display_row buffer will
* be ignored, so pass NULL to it.
*
* [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.5s.
* [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.6.
*/
void
......@@ -690,7 +690,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
* only call this function once. If you desire to have an image for
* each pass of a interlaced image, use png_read_rows() instead.
*
* [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.5s.
* [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.6.
*/
void
png_read_image(png_structp png_ptr, png_bytepp image)
......@@ -1113,9 +1113,6 @@ void png_read_png(png_structp png_ptr, png_infop info_ptr,
{
int row;
if(transforms == 0 || params == (voidp)NULL)
/* quiet compiler warnings */ ;
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
/* invert the alpha channel from opacity to transparency */
if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
......@@ -1237,5 +1234,9 @@ void png_read_png(png_structp png_ptr, png_infop info_ptr,
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end(png_ptr, info_ptr);
if(transforms == 0 || params == (voidp)NULL)
/* quiet compiler warnings */ return;
}
#endif
pngrio.c
浏览文件 @ 520a764c
/* pngrio.c - functions for data input
*
* libpng 1.0.5s - February 18, 2000
* libpng 1.0.6 - March 21, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
......
pngrtran.c
浏览文件 @ 520a764c
/* pngrtran.c - transforms the data in a row for PNG readers
*
* libpng 1.0.5s - February 18, 2000
* libpng 1.0.6 - March 21, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
......@@ -582,14 +582,25 @@ png_set_gray_to_rgb(png_structp png_ptr)
}
#endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) && \
defined(PNG_FLOATING_POINT_SUPPORTED)
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
#if defined(PNG_FLOATING_POINT_SUPPORTED)
/* Convert a RGB image to a grayscale of the same width. This allows us,
* for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image.
*/
void
png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red,
double green)
double green)
{
int red_fixed = (int)((float)red*100000.0 + 0.5);
int green_fixed = (int)((float)green*100000.0 + 0.5);
png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed);
}
#endif
void
png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action,
png_fixed_point red, png_fixed_point green)
{
png_debug(1, "in png_set_rgb_to_gray\n");
switch(error_action)
......@@ -610,22 +621,26 @@ png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red,
}
#endif
{
png_byte red_byte = (png_byte)((float)red*255.0 + 0.5);
png_byte green_byte = (png_byte)((float)green*255.0 + 0.5);
if(red < 0.0 || green < 0.0)
png_uint_16 red_int, green_int;
if(red > 0 && green > 0)
{
red_byte = 54;
green_byte = 183;
red_int = 6968; /* .212671 * 32768 + .5 */
green_int = 23434; /* .715160 * 32768 + .5 */
}
else if(red_byte + green_byte > 255)
else if(red + green < 100000L)
{
red_int = (png_uint_16)(((png_uint_32)red*32768L)/100000L);
green_int = (png_uint_16)(((png_uint_32)green*32768L)/100000L);
}
else
{
png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients");
red_byte = 54;
green_byte = 183;
red_int = 6968;
green_int = 23434;
}
png_ptr->rgb_to_gray_red_coeff = red_byte;
png_ptr->rgb_to_gray_green_coeff = green_byte;
png_ptr->rgb_to_gray_blue_coeff = (png_byte)(255-red_byte-green_byte);
png_ptr->rgb_to_gray_red_coeff = red_int;
png_ptr->rgb_to_gray_green_coeff = green_int;
png_ptr->rgb_to_gray_blue_coeff = (png_uint_16)(32768-red_int-green_int);
}
}
#endif
......@@ -2021,11 +2036,11 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
*
* We approximate this with
*
* Y = 0.211 * R + 0.715 * G + 0.074 * B
* Y = 0.21268 * R + 0.7151 * G + 0.07217 * B
*
* which can be expressed with integers as
*
* Y = (54 * R + 183 * G + 19 * B)/256
* Y = (6969 * R + 23434 * G + 2365 * B)/32768
*
* The calculation is to be done in a linear colorspace.
*
......@@ -2047,9 +2062,9 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
#endif
(row_info->color_type & PNG_COLOR_MASK_COLOR))
{
png_byte rc = png_ptr->rgb_to_gray_red_coeff;
png_byte gc = png_ptr->rgb_to_gray_green_coeff;
png_byte bc = png_ptr->rgb_to_gray_blue_coeff;
png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff;
png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff;
png_uint_32 bc = png_ptr->rgb_to_gray_blue_coeff;
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
{
......@@ -2070,7 +2085,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
{
rgb_error |= 1;
*(dp++) = png_ptr->gamma_from_1[
(rc*red+gc*green+bc*blue)>>8];
(rc*red+gc*green+bc*blue)>>15];
}
else
*(dp++) = *(sp-1);
......@@ -2089,7 +2104,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
if(red != green || red != blue)
{
rgb_error |= 1;
*(dp++) = (png_byte)((rc*red+gc*green+bc*blue)>>8);
*(dp++) = (png_byte)((rc*red+gc*green+bc*blue)>>15);
}
else
*(dp++) = *(sp-1);
......@@ -2124,7 +2139,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >>
png_ptr->gamma_shift][blue>>8];
png_uint_16 gray16 = (png_uint_16)((rc*red_1 + gc*green_1
+ bc*blue_1)>>8);
+ bc*blue_1)>>15);
w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
png_ptr->gamma_shift][gray16 >> 8];
rgb_error |= 1;
......@@ -2149,7 +2164,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
if(red != green || red != blue)
rgb_error |= 1;
gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>8);
gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
*(dp++) = (png_byte)((gray16>>8) & 0xff);
*(dp++) = (png_byte)(gray16 & 0xff);
}
......@@ -2173,7 +2188,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
if(red != green || red != blue)
rgb_error |= 1;
*(dp++) = png_ptr->gamma_from_1
[(rc*red + gc*green + bc*blue)>>8];
[(rc*red + gc*green + bc*blue)>>15];
*(dp++) = *(sp++); /* alpha */
}
}
......@@ -2221,7 +2236,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >>
png_ptr->gamma_shift][blue>>8];
png_uint_16 gray16 = (png_uint_16)((rc * red_1
+ gc * green_1 + bc * blue_1)>>8);
+ gc * green_1 + bc * blue_1)>>15);
w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
png_ptr->gamma_shift][gray16 >> 8];
rgb_error |= 1;
......@@ -2246,7 +2261,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
blue = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2;
if(red != green || red != blue)
rgb_error |= 1;
gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>8);
gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
*(dp++) = (png_byte)((gray16>>8) & 0xff);
*(dp++) = (png_byte)(gray16 & 0xff);
*(dp++) = *(sp++); /* alpha */
......
pngrutil.c
浏览文件 @ 520a764c
/* pngrutil.c - utilities to read a PNG file
*
* libpng 1.0.5s - February 18, 2000
* libpng 1.0.6 - March 21, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
......@@ -147,7 +147,7 @@ png_charp png_decompress_chunk(png_structp png_ptr, int comp_type,
{
static char msg[] = "Error decoding compressed text";
png_charp text = NULL;
png_size_t text_size = (chunklength - prefix_size);
png_size_t text_size;
if (comp_type == PNG_TEXT_COMPRESSION_zTXt)
{
......@@ -161,9 +161,7 @@ png_charp png_decompress_chunk(png_structp png_ptr, int comp_type,
while (png_ptr->zstream.avail_in)
{
int ret;
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
int ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
if (ret != Z_OK && ret != Z_STREAM_END)
{
if (png_ptr->zstream.msg != NULL)
......@@ -262,7 +260,7 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_debug(1, "in png_handle_IHDR\n");
if (png_ptr->mode != PNG_BEFORE_IHDR)
if (png_ptr->mode & PNG_HAVE_IHDR)
png_error(png_ptr, "Out of place IHDR");
/* check the length */
......@@ -968,7 +966,7 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_bytep chunkdata;
png_bytep entry_start;
png_spalette new_palette;
png_sPLT_t new_palette;
int data_length, entry_size, i;
png_uint_32 skip = 0;
png_size_t slength;
......@@ -1028,12 +1026,12 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
}
new_palette.nentries = data_length / entry_size;
new_palette.entries = (png_spalette_entryp)png_malloc(
png_ptr, new_palette.nentries * sizeof(png_spalette_entry));
new_palette.entries = (png_sPLT_entryp)png_malloc(
png_ptr, new_palette.nentries * sizeof(png_sPLT_entry));
for (i = 0; i < new_palette.nentries; i++)
{
png_spalette_entryp pp = new_palette.entries + i;
png_sPLT_entryp pp = new_palette.entries + i;
if (new_palette.depth == 8)
{
......@@ -1090,7 +1088,7 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Missing PLTE before tRNS");
}
else if (length > png_ptr->num_palette)
else if (length > (png_uint_32)png_ptr->num_palette)
{
png_warning(png_ptr, "Incorrect tRNS chunk length");
png_crc_finish(png_ptr, length);
......@@ -1510,7 +1508,7 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_charp buffer, ep;
#ifdef PNG_FLOATING_POINT_SUPPORTED
double width=0., height=0.;
double width, height;
png_charp vp;
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
......@@ -1723,7 +1721,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_textp text_ptr;
png_charp chunkdata;
png_charp text;
int comp_type = PNG_TEXT_COMPRESSION_NONE;
int comp_type;
png_size_t slength, prefix_len;
png_debug(1, "in png_handle_zTXt\n");
......@@ -1798,7 +1796,7 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_textp text_ptr;
png_charp chunkdata;
png_charp key, lang, text, lang_key;
int comp_flag = PNG_TEXT_COMPRESSION_NONE;
int comp_flag;
int comp_type = 0;
png_size_t slength, prefix_len;
......
pngset.c
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pngtest.c
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pngtrans.c
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pngwutil.c
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make -fmakefile.bor -B -DMODEL=m %1 %2 %3 libpng >buildm.out
make -fmakefile.bor -B -DMODEL=l %1 %2 %3 libpng >buildl.out
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