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[devel] Freeze build-time only configuration in the build.

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In all prior versions of libpng most configuration options
    controlled by compiler #defines had to be repeated by the
    application code that used libpng.  This patch changes this
    so that compilation options that can only be changed at build
    time are frozen in the build.  Options that are compiler
    dependent (and those that are system dependent) are evaluated
    each time - pngconf.h holds these.  Options that can be changed
    per-file in the application are in png.h.  Frozen options are
    in the new installed header file pnglconf.h
This commit is contained in:
Glenn Randers-Pehrson
2010-04-16 22:12:51 -05:00
parent 3cd7cffd0c
commit 862cb20ea6
18 changed files with 1459 additions and 1088 deletions
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libpng.3
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@@ -1957,7 +1957,7 @@ recommended that PNG viewers support gamma correction.
If you need to reduce an RGB file to a paletted file, or if a paletted
file has more entries then will fit on your screen, png_set_quantize()
will do that. Note that this is a simple match dither that merely
will do that. Note that this is a simple match quantization that merely
finds the closest color available. This should work fairly well with
optimized palettes, and fairly badly with linear color cubes. If you
pass a palette that is larger then maximum_colors, the file will