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Export animated GIFs with dispose background frames

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Closes GH-14 where flashing text in Mix mode would not flash to the
transparent background.

The bundled QtGifImage does not expose a way to change the DisposalMode in
giflib and thus it is fixed at 0 or DISPOSAL_UNSPECIFIED. This is a quick and
dirty change to fix it to 2 or DISPOSAL_BACKGROUND for our needs.

A proper fix would be to fork QtGifImage and add a more accessible API call
to choose the DisposalMode value.
This commit is contained in:
Gavin MacGregor
2025-12-01 22:09:49 +00:00
parent dbbeea9d30
commit fcca93e5a5
1 changed files with 1 additions and 1 deletions
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2
3rdparty/QtGifImage/include/gifimage/qgifimage.cpp vendored
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@@ -306,7 +306,7 @@ bool QGifImagePrivate::save(QIODevice *device) const {
} }
GraphicsControlBlock gcbBlock; GraphicsControlBlock gcbBlock;
gcbBlock.DisposalMode = 0; gcbBlock.DisposalMode = 2;
gcbBlock.UserInputFlag = false; gcbBlock.UserInputFlag = false;
gcbBlock.TransparentColor = getFrameTransparentColorIndex(frameInfo); gcbBlock.TransparentColor = getFrameTransparentColorIndex(frameInfo);