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[rtextures] Fix GetPixelColor() reading the wrong bits for R5G5B5A1 blue (#6113)

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R5G5B5A1 packs blue in bits 5..1 and alpha in bit 0, which is what
SetPixelColor(), ImageFormat(), LoadImageColors() and GetImageColor()
all do. GetPixelColor() masked bits 4..0 instead, so the decoded blue
was the low four bits of blue shifted up with the alpha bit pulled in
as its LSB.

Packing r == g == b and decoding it back gave (164, 164, 74) for
r=g=b=20; 31 of the 32 possible grey values decoded with unequal
channels. ImageDrawImage() blends through GetPixelColor(), so drawing
onto an R5G5B5A1 image was affected too.

Co-authored-by: Dylan Pulver <dylanpulver@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Dylan Pulver
2026-09-02 10:42:19 +03:00
committed by GitHub
parent 656d42c4da
commit 237c1f85dd
1 changed files with 1 additions and 1 deletions
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src/rtextures.c
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@@ -5333,7 +5333,7 @@ Color GetPixelColor(const void *srcPtr, int format)
{
color.r = (unsigned char)((((unsigned short *)srcPtr)[0] >> 11)*255/31);
color.g = (unsigned char)(((((unsigned short *)srcPtr)[0] >> 6) & 0b0000000000011111)*255/31);
color.b = (unsigned char)((((unsigned short *)srcPtr)[0] & 0b0000000000011111)*255/31);
color.b = (unsigned char)(((((unsigned short *)srcPtr)[0] >> 1) & 0b0000000000011111)*255/31);
color.a = (((unsigned short *)srcPtr)[0] & 0b0000000000000001)? 255 : 0;
} break;