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Displayio: improved accuracy of ColorConverter when converting rgb555 (and bgr555) col… #10076

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Merged
merged 1 commit into from
Feb 18, 2025
Merged

Displayio: improved accuracy of ColorConverter when converting rgb555 (and bgr555) col… #10076

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18 changes: 12 additions & 6 deletions shared-module/displayio/ColorConverter.c
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Original file line number Diff line number Diff line change
Expand Up @@ -197,9 +197,12 @@ uint32_t displayio_colorconverter_convert_pixel(displayio_colorspace_t colorspac
pixel = __builtin_bswap16(pixel);
MP_FALLTHROUGH;
case DISPLAYIO_COLORSPACE_RGB555: {
uint32_t r8 = (pixel >> 10) << 3;
uint32_t g8 = ((pixel >> 5) << 3) & 0xff;
uint32_t b8 = (pixel << 3) & 0xff;
uint32_t r8 = (pixel >> 10) & 0x1f;
uint32_t g8 = (pixel >> 5) & 0x1f;
uint32_t b8 = pixel & 0x1f;
r8 = (r8 << 3) | ((r8 >> 2) & 0b111);
g8 = (g8 << 3) | ((g8 >> 2) & 0b111);
b8 = (b8 << 3) | ((b8 >> 2) & 0b111);
pixel = (r8 << 16) | (g8 << 8) | b8;
}
break;
Expand All @@ -219,9 +222,12 @@ uint32_t displayio_colorconverter_convert_pixel(displayio_colorspace_t colorspac
pixel = __builtin_bswap16(pixel);
MP_FALLTHROUGH;
case DISPLAYIO_COLORSPACE_BGR555: {
uint32_t b8 = (pixel >> 10) << 3;
uint32_t g8 = ((pixel >> 5) << 3) & 0xff;
uint32_t r8 = (pixel << 3) & 0xff;
uint32_t b8 = (pixel >> 10) & 0x1f;
uint32_t g8 = (pixel >> 5) & 0x1f;
uint32_t r8 = pixel & 0x1f;
r8 = (r8 << 3) | ((r8 >> 2) & 0b111);
g8 = (g8 << 3) | ((g8 >> 2) & 0b111);
b8 = (b8 << 3) | ((b8 >> 2) & 0b111);
pixel = (r8 << 16) | (g8 << 8) | b8;
}
break;
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