Allow GIFs missing both Global and Local Colormaps to still decode #494
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Ensure that a GIF without any Global or Local color tables is still decoded by libgd. GIF89a spec indicates conforming image files need not have Global or Local color tables at all. Spec recommends creating custom color map in that situation, and that at least Black+White as first two entries, to ensure B&W images are decoded. Some commonly used single-pixel GIFs found around the web are undecoded by libgd otherwise. Test case has been included. References: https://www.w3.org/Graphics/GIF/spec-gif89a.txt http://probablyprogramming.com/2009/03/15/the-tiniest-gif-ever
cmb69
reviewed
Jan 29, 2019
cmb69
approved these changes
Jan 29, 2019
Consistent use of LIST(APPEND over SET(
In some distros (Fedora/Centos), finding "freetype" would fail. This asks pkg-config for some help. Recycled the pkg-config example that was in "FindFontConfig.h"
vapier
reviewed
Feb 9, 2019
This reverts commit 8b569e7. Fixes will be sent to the upstream project (cmake).
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Ensure that a GIF without any Global or Local color tables is still
decoded by libgd.
GIF89a spec indicates conforming image files need not have
Global or Local color tables at all.
Spec recommends creating custom color map in that situation, and
that at least Black+White as first two entries, to ensure B&W images
are decoded.
Some commonly used single-pixel GIFs found around the web are
undecoded by libgd otherwise. Test case has been included.
References:
https://www.w3.org/Graphics/GIF/spec-gif89a.txt
http://probablyprogramming.com/2009/03/15/the-tiniest-gif-ever