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[devel] Added high-level PNG_TRANSFORM_GRAY_TO_RGB transform.

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Glenn Randers-Pehrson
2009-06-29 17:30:00 -05:00
parent 6878eb6899
commit 99708d560f
7 changed files with 37 additions and 8 deletions
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libpng.3
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@@ -1256,6 +1256,8 @@ you want to do are limited to the following set:
PNG_TRANSFORM_INVERT_ALPHA Change alpha from opacity
to transparency
PNG_TRANSFORM_SWAP_ENDIAN Byte-swap 16-bit samples
PNG_TRANSFORM_GRAY_TO_RGB Expand grayscale samples
to RGB (or GA to RGBA)
(This excludes setting a background color, doing gamma transformation,
dithering, and setting filler.) If this is the case, simply do this:
@@ -3837,13 +3839,18 @@ The png_calloc() function was added.
We removed the trailing '.' from the warning and error messages.
We added PNG_TRANSFORM_GRAY_TO_RGB to the available high-level
input transforms.
.SH X. Detecting libpng
The png_get_io_ptr() function has been present since libpng-0.88, has never
changed, and is unaffected by conditional compilation macros. It is the
best choice for use in configure scripts for detecting the presence of any
libpng version since 0.88.
libpng version since 0.88. In an autoconf "configure.in" you could use
AC_CHECK_LIB(png, png_get_io_ptr, ...
.SH XI. Source code repository