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[libpng17] Updated manual page about png_get_palette_max() API.

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Glenn Randers-Pehrson
2013-02-08 09:24:35 -06:00
parent b5a7565908
commit e860f77393
4 changed files with 14 additions and 18 deletions
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libpng.3
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@@ -5087,12 +5087,16 @@ any invalid pixels are decoded as opaque black by the decoder and written
as-is by the encoder.
Retrieving the maximum palette index found was added at libpng-1.5.15.
This statement must appear after png_read_png() or png_read_image().
This statement must appear after png_read_png() or png_read_image() while
reading, and after png_write_png() or png_write_image() while writing.
int max_palette = png_get_palette_max(png_ptr, info_ptr);
This will return the maximum palette index found, or "-1" if the palette
was not checked, or "0" if no palette was found.
This will return the maximum palette index found in the image, or "-1" if
the palette was not checked, or "0" if no palette was found. Note that this
does not account for any palette index used by ancillary chunks such as the
bKGD chunk; you must check those separately to determine the maximum
palette index actually used.
A. Changes that affect users of libpng