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体验新版 GitCode,发现更多精彩内容 >>
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8b1d835e
编写于
4月 08, 2015
作者:
T
Tim Kelsey
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
Adding memory and assert defines to stb_image_write
上级
bdef693b
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
57 addition
and
30 deletion
+57
-30
stb_image_write.h
stb_image_write.h
+57
-30
未找到文件。
stb_image_write.h
浏览文件 @
8b1d835e
/* stb_image_write - v0.9
7
- public domain - http://nothings.org/stb/stb_image_write.h
/* stb_image_write - v0.9
8
- public domain - http://nothings.org/stb/stb_image_write.h
writes out PNG/BMP/TGA images to C stdio - Sean Barrett 2010
no warranty implied; use at your own risk
...
...
@@ -9,6 +9,10 @@
in the file that you want to have the implementation.
You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free
You can optionally define STBI_MEMMOVE and STBI_MEMCPY if the default semantics of
memmove and memcpy would be incompatible with your choice of malloc et al.
Will probably not work correctly with strict-aliasing optimizations.
...
...
@@ -32,7 +36,7 @@ USAGE:
int stbi_write_hdr(char const *filename, int w, int h, int comp, const void *data);
Each function returns 0 on failure and non-0 on success.
The functions create an image file defined by the parameters. The image
is a rectangle of pixels stored from left-to-right, top-to-bottom.
Each pixel contains 'comp' channels of data stored interleaved with 8-bits
...
...
@@ -45,7 +49,7 @@ USAGE:
PNG creates output files with the same number of components as the input.
The BMP format expands Y to RGB in the file format and does not
output alpha.
PNG supports writing rectangles of data even when the bytes storing rows of
data are not consecutive in memory (e.g. sub-rectangles of a larger image),
by supplying the stride between the beginning of adjacent rows. The other
...
...
@@ -67,6 +71,8 @@ CREDITS:
Jean-Sebastien Guay
Bugfixes:
Chribba@github
STBI_MALLOC etc:
callidus@github
*/
#ifndef INCLUDE_STB_IMAGE_WRITE_H
...
...
@@ -93,9 +99,29 @@ extern int stbi_write_hdr(char const *filename, int w, int h, int comp, const fl
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#if defined(STBI_MALLOC) && defined(STBI_FREE) && defined(STBI_REALLOC)
// ok
#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC)
// ok
#else
#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC."
#endif
#ifndef STBI_MALLOC
#define STBI_MALLOC(sz) malloc(sz)
#define STBI_REALLOC(p,sz) realloc(p,sz)
#define STBI_FREE(p) free(p)
#define STBI_MEMMOVE(a,b,sz) memmove(a,b,sz)
#define STBI_MEMCPY(a,b,sz) memcpy(a,b,sz)
#endif
#ifndef STBI_ASSERT
#include <assert.h>
#define STBI_ASSERT(x) assert(x)
#endif
typedef
unsigned
int
stbiw_uint32
;
typedef
int
stb_image_write_test
[
sizeof
(
stbiw_uint32
)
==
4
?
1
:
-
1
];
...
...
@@ -113,7 +139,7 @@ static void writefv(FILE *f, const char *fmt, va_list v)
b
[
2
]
=
(
unsigned
char
)(
x
>>
16
);
b
[
3
]
=
(
unsigned
char
)(
x
>>
24
);
fwrite
(
b
,
4
,
1
,
f
);
break
;
}
default:
assert
(
0
);
STBI_ASSERT
(
0
);
return
;
}
}
...
...
@@ -135,7 +161,7 @@ static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp,
if
(
y
<=
0
)
return
;
if
(
vdir
<
0
)
if
(
vdir
<
0
)
j_end
=
-
1
,
j
=
y
-
1
;
else
j_end
=
y
,
j
=
0
;
...
...
@@ -232,7 +258,7 @@ void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear)
void
stbiw__write_run_data
(
FILE
*
f
,
int
length
,
unsigned
char
databyte
)
{
unsigned
char
lengthbyte
=
(
unsigned
char
)
(
length
+
128
);
assert
(
length
+
128
<=
255
);
STBI_ASSERT
(
length
+
128
<=
255
);
fwrite
(
&
lengthbyte
,
1
,
1
,
f
);
fwrite
(
&
databyte
,
1
,
1
,
f
);
}
...
...
@@ -240,7 +266,7 @@ void stbiw__write_run_data(FILE *f, int length, unsigned char databyte)
void
stbiw__write_dump_data
(
FILE
*
f
,
int
length
,
unsigned
char
*
data
)
{
unsigned
char
lengthbyte
=
(
unsigned
char
)(
length
&
0xff
);
assert
(
length
<=
128
);
// inconsistent with spec but consistent with official code
STBI_ASSERT
(
length
<=
128
);
// inconsistent with spec but consistent with official code
fwrite
(
&
lengthbyte
,
1
,
1
,
f
);
fwrite
(
data
,
length
,
1
,
f
);
}
...
...
@@ -321,7 +347,7 @@ void stbiw__write_hdr_scanline(FILE *f, int width, int comp, unsigned char *scra
if
(
r
+
2
<
width
)
{
// same test as what we break out of in search loop, so only true if we break'd
// find next byte after run
while
(
r
<
width
&&
comp
[
r
]
==
comp
[
x
])
++
r
;
++
r
;
// output run up to r
while
(
x
<
r
)
{
int
len
=
r
-
x
;
...
...
@@ -343,12 +369,12 @@ int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *da
f
=
fopen
(
filename
,
"wb"
);
if
(
f
)
{
/* Each component is stored separately. Allocate scratch space for full output scanline. */
unsigned
char
*
scratch
=
(
unsigned
char
*
)
malloc
(
x
*
4
);
unsigned
char
*
scratch
=
(
unsigned
char
*
)
STBI_MALLOC
(
x
*
4
);
fprintf
(
f
,
"#?RADIANCE
\n
# Written by stb_image_write.h
\n
FORMAT=32-bit_rle_rgbe
\n
"
);
fprintf
(
f
,
"EXPOSURE= 1.0000000000000
\n\n
-Y %d +X %d
\n
"
,
y
,
x
);
for
(
i
=
0
;
i
<
y
;
i
++
)
stbiw__write_hdr_scanline
(
f
,
x
,
comp
,
scratch
,
data
+
comp
*
i
*
x
);
free
(
scratch
);
STBI_FREE
(
scratch
);
fclose
(
f
);
}
return
f
!=
NULL
;
...
...
@@ -368,13 +394,13 @@ int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *da
#define stbiw__sbpush(a, v) (stbiw__sbmaybegrow(a,1), (a)[stbiw__sbn(a)++] = (v))
#define stbiw__sbcount(a) ((a) ? stbiw__sbn(a) : 0)
#define stbiw__sbfree(a) ((a) ?
free
(stbiw__sbraw(a)),0 : 0)
#define stbiw__sbfree(a) ((a) ?
STBI_FREE
(stbiw__sbraw(a)),0 : 0)
static
void
*
stbiw__sbgrowf
(
void
**
arr
,
int
increment
,
int
itemsize
)
{
int
m
=
*
arr
?
2
*
stbiw__sbm
(
*
arr
)
+
increment
:
increment
+
1
;
void
*
p
=
realloc
(
*
arr
?
stbiw__sbraw
(
*
arr
)
:
0
,
itemsize
*
m
+
sizeof
(
int
)
*
2
);
assert
(
p
);
void
*
p
=
STBI_REALLOC
(
*
arr
?
stbiw__sbraw
(
*
arr
)
:
0
,
itemsize
*
m
+
sizeof
(
int
)
*
2
);
STBI_ASSERT
(
p
);
if
(
p
)
{
if
(
!*
arr
)
((
int
*
)
p
)[
1
]
=
0
;
*
arr
=
(
void
*
)
((
int
*
)
p
+
2
);
...
...
@@ -459,7 +485,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
i
=
0
;
while
(
i
<
data_len
-
3
)
{
// hash next 3 bytes of data to be compressed
// hash next 3 bytes of data to be compressed
int
h
=
stbiw__zhash
(
data
+
i
)
&
(
stbiw__ZHASH
-
1
),
best
=
3
;
unsigned
char
*
bestloc
=
0
;
unsigned
char
**
hlist
=
hash_table
[
h
];
...
...
@@ -472,7 +498,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
}
// when hash table entry is too long, delete half the entries
if
(
hash_table
[
h
]
&&
stbiw__sbn
(
hash_table
[
h
])
==
2
*
quality
)
{
memcpy
(
hash_table
[
h
],
hash_table
[
h
]
+
quality
,
sizeof
(
hash_table
[
h
][
0
])
*
quality
);
STBI_MEMCPY
(
hash_table
[
h
],
hash_table
[
h
]
+
quality
,
sizeof
(
hash_table
[
h
][
0
])
*
quality
);
stbiw__sbn
(
hash_table
[
h
])
=
quality
;
}
stbiw__sbpush
(
hash_table
[
h
],
data
+
i
);
...
...
@@ -495,7 +521,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
if
(
bestloc
)
{
int
d
=
(
int
)
(
data
+
i
-
bestloc
);
// distance back
assert
(
d
<=
32767
&&
best
<=
258
);
STBI_ASSERT
(
d
<=
32767
&&
best
<=
258
);
for
(
j
=
0
;
best
>
lengthc
[
j
+
1
]
-
1
;
++
j
);
stbiw__zlib_huff
(
j
+
257
);
if
(
lengtheb
[
j
])
stbiw__zlib_add
(
best
-
lengthc
[
j
],
lengtheb
[
j
]);
...
...
@@ -536,7 +562,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
}
*
out_len
=
stbiw__sbn
(
out
);
// make returned pointer freeable
memmove
(
stbiw__sbraw
(
out
),
out
,
*
out_len
);
STBI_MEMMOVE
(
stbiw__sbraw
(
out
),
out
,
*
out_len
);
return
(
unsigned
char
*
)
stbiw__sbraw
(
out
);
}
...
...
@@ -583,8 +609,8 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in
if
(
stride_bytes
==
0
)
stride_bytes
=
x
*
n
;
filt
=
(
unsigned
char
*
)
malloc
((
x
*
n
+
1
)
*
y
);
if
(
!
filt
)
return
0
;
line_buffer
=
(
signed
char
*
)
malloc
(
x
*
n
);
if
(
!
line_buffer
)
{
free
(
filt
);
return
0
;
}
filt
=
(
unsigned
char
*
)
STBI_MALLOC
((
x
*
n
+
1
)
*
y
);
if
(
!
filt
)
return
0
;
line_buffer
=
(
signed
char
*
)
STBI_MALLOC
(
x
*
n
);
if
(
!
line_buffer
)
{
STBI_FREE
(
filt
);
return
0
;
}
for
(
j
=
0
;
j
<
y
;
++
j
)
{
static
int
mapping
[]
=
{
0
,
1
,
2
,
3
,
4
};
static
int
firstmap
[]
=
{
0
,
1
,
0
,
5
,
6
};
...
...
@@ -623,20 +649,20 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in
}
// when we get here, best contains the filter type, and line_buffer contains the data
filt
[
j
*
(
x
*
n
+
1
)]
=
(
unsigned
char
)
best
;
memcpy
(
filt
+
j
*
(
x
*
n
+
1
)
+
1
,
line_buffer
,
x
*
n
);
STBI_MEMCPY
(
filt
+
j
*
(
x
*
n
+
1
)
+
1
,
line_buffer
,
x
*
n
);
}
free
(
line_buffer
);
STBI_FREE
(
line_buffer
);
zlib
=
stbi_zlib_compress
(
filt
,
y
*
(
x
*
n
+
1
),
&
zlen
,
8
);
// increase 8 to get smaller but use more memory
free
(
filt
);
STBI_FREE
(
filt
);
if
(
!
zlib
)
return
0
;
// each tag requires 12 bytes of overhead
out
=
(
unsigned
char
*
)
malloc
(
8
+
12
+
13
+
12
+
zlen
+
12
);
out
=
(
unsigned
char
*
)
STBI_MALLOC
(
8
+
12
+
13
+
12
+
zlen
+
12
);
if
(
!
out
)
return
0
;
*
out_len
=
8
+
12
+
13
+
12
+
zlen
+
12
;
o
=
out
;
memcpy
(
o
,
sig
,
8
);
o
+=
8
;
STBI_MEMCPY
(
o
,
sig
,
8
);
o
+=
8
;
stbiw__wp32
(
o
,
13
);
// header length
stbiw__wptag
(
o
,
"IHDR"
);
stbiw__wp32
(
o
,
x
);
...
...
@@ -650,14 +676,14 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in
stbiw__wp32
(
o
,
zlen
);
stbiw__wptag
(
o
,
"IDAT"
);
memcpy
(
o
,
zlib
,
zlen
);
o
+=
zlen
;
free
(
zlib
);
STBI_MEMCPY
(
o
,
zlib
,
zlen
);
o
+=
zlen
;
STBI_FREE
(
zlib
);
stbiw__wpcrc
(
&
o
,
zlen
);
stbiw__wp32
(
o
,
0
);
stbiw__wptag
(
o
,
"IEND"
);
stbiw__wpcrc
(
&
o
,
0
);
assert
(
o
==
out
+
*
out_len
);
STBI_ASSERT
(
o
==
out
+
*
out_len
);
return
out
;
}
...
...
@@ -669,16 +695,17 @@ int stbi_write_png(char const *filename, int x, int y, int comp, const void *dat
unsigned
char
*
png
=
stbi_write_png_to_mem
((
unsigned
char
*
)
data
,
stride_bytes
,
x
,
y
,
comp
,
&
len
);
if
(
!
png
)
return
0
;
f
=
fopen
(
filename
,
"wb"
);
if
(
!
f
)
{
free
(
png
);
return
0
;
}
if
(
!
f
)
{
STBI_FREE
(
png
);
return
0
;
}
fwrite
(
png
,
1
,
len
,
f
);
fclose
(
f
);
free
(
png
);
STBI_FREE
(
png
);
return
1
;
}
#endif // STB_IMAGE_WRITE_IMPLEMENTATION
/* Revision history
0.98 (2015-04-08)
added STBI_MALLOC, STBI_ASSERT etc
0.97 (2015-01-18)
fixed HDR asserts, rewrote HDR rle logic
0.96 (2015-01-17)
...
...
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