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Fix semi-transparent text on Linux with subpixel anti-aliasing

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The newly optimized rgbBlend function wasn't updated to handle
SourceOver compositing when dealing with semi-transparent text color.

The extra composition isn't SIMD optimized but short-cut for all opaque
colors.

Fixes: QTBUG-80982
Change-Id: I88c1e60fd5e80a8c7f9e6b0e7de8248c7c00ebc2
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
This commit is contained in:
Allan Sandfeld Jensen 2019-12-27 18:01:49 +01:00
parent 56674dca36
commit 2c3eaa7b87
1 changed files with 5 additions and 1 deletions
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6
src/gui/painting/qdrawhelper.cpp
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@ -6048,7 +6048,11 @@ static inline void alphargbblend_argb32(quint32 *dst, uint coverage, const QRgba
// Give up and do a naive gray alphablend. Needed to deal with ARGB32 and invalid ARGB32_premultiplied, see QTBUG-60571
blend_pixel(*dst, src, qRgbAvg(coverage));
} else if (!colorProfile) {
*dst = rgbBlend(*dst, src, coverage);
// First do naive blend with text-color
QRgb s = *dst;
blend_pixel(s, src);
// Then a naive blend with glyph shape
*dst = rgbBlend(*dst, s, coverage);
} else if (srcLinear.isOpaque()) {
rgbBlendPixel(dst, coverage, srcLinear, colorProfile);
} else {