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Set C palette to be empty by default#7289

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hugovk merged 3 commits into
python-pillow:mainfrom
radarhere:undefined_palette
Oct 5, 2023
Merged

Set C palette to be empty by default#7289
hugovk merged 3 commits into
python-pillow:mainfrom
radarhere:undefined_palette

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@radarhere

@radarhere radarhere commented Jul 16, 2023

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Resolves #7288

The image in the issue has indexes that occur outside of the palette. This PR ensures that they are black.

@radarhere radarhere mentioned this pull request Jul 16, 2023
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@Yay295

Yay295 commented Jul 17, 2023

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This seems inefficient. ImagingPaletteNew already uses calloc to get its data, but then initializes it. It would be faster to just not initialize it in the first place. ImagingPaletteNew isn't used in very many places, so I think the cleaner solution would be to change ImagingPaletteNew to not initialize its values, and create a new function ImagingPaletteNewRamp that first calls ImagingPaletteNew and then initializes the data as ImagingPaletteNew does currently. There's another already existing function ImagingPaletteNewBrowser that does essentially that, but with different starting values.

https://github.com/python-pillow/Pillow/blob/b9451540973ca7915b0ce68e6bbacbed665caec2/src/libImaging/Palette.c#L23C1-L95

@radarhere

radarhere commented Jul 17, 2023

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Ok, I've pushed a new commit to set the palette to be empty by default.

This is now a C sequel to 4d36fee

@radarhere radarhere changed the title Set undefined palette values to black Set C palette to be empty by default Jul 17, 2023
Yay295
Yay295 reviewed Jul 17, 2023
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Comment thread src/libImaging/Palette.c Outdated
@@ -40,10 +40,8 @@ ImagingPaletteNew(const char *mode) {
palette->mode[IMAGING_MODE_LENGTH - 1] = 0;

/* Initialize to ramp */

@Yay295 Yay295 Jul 17, 2023

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This comment is now outdated.

@radarhere radarhere Jul 17, 2023

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Ok, I've pushed a commit to remove it.

@hugovk hugovk merged commit 5f04b3d into python-pillow:main Oct 5, 2023
@radarhere radarhere deleted the undefined_palette branch October 5, 2023 21:26
This was referenced Nov 15, 2023
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Incorrect transparency after converting indexed image to RGB

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@radarhere @Yay295 @hugovk