found (performance report by PoChun Chang)

Reverted previous attempt to allow gAMA and sRGB non-support with the
simplified API.

png_set of the transform function, but that doesn't matter unless the
transform function changes the rowbuf size, and that is only valid if
transform_info is called.

Folded some long lines.

in pngrtran.c (Domani Hannes).

png_memset(), png_memcpy(), and png_memcmp() macros.

a consistent style for (sizeof type) and (sizeof (array))

(only update the value when it actually increases, move test for whether
the check is wanted out of the function.

load iCCP

benign errors; also added --strict to pngstest - not enabled
yet because a warning is produced.

checks. The code now does a png_error if an attempt is made to do the
row initialization twice; this is an application error and it has
serious consequences because the transform data in png_struct is
changed by each call.

This turns on PNG_FLAG_DETECT_UNINITIALIZED to detect app code that
fails to call one of the 'start' routines (not enabled in libpng-1.5
because it is technically an API change, since it did normally work
before.)  It also makes duplicate calls to png_read_start_row (an
internal function called at the start of the image read) benign, as
they were before changes to use png_inflate_claim. Somehow webkit is
causing this to happen; this is probably a mis-feature in the zlib
changes so this commit is only a work-round.

Relocated palette-index checking function from pngrutil.c to pngtrans.c

code.

(work in progress, the latter isn't finished).

compiler issues slightly different warnings from those issued by the
current vesions of GCC. This eliminates those warnings by
adding/removing casts and small code rewrites.

This is an initial version for review; the documentation has not yet been
updated.

those uses of png_memcpy that were doing a simple assignment to assignments
(all those cases where the thing being copied is a non-array C L-value.)
Added some error checking to png_set_*() routines and removed the
reference to the non-exported function png_memcpy() from example.c. Fixed
the Visual C 64-bit build - it requires jmp_buf to be aligned, but it had
become misaligned.

Added new "png_structrp" typedef. Because of the
way libpng works both png_info and png_struct are always accessed via a
single pointer.  This means adding C99 'restrict' to the pointer gives
the compiler some opportunity to optimize the code.  This change allows that.