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LibGfx: Multiply alpha channels for vector fonts, when necessary

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When the background color has an alpha < 255, we can't copy over the
pixel alpha.
This commit is contained in:
Andi Gallo 2023-06-01 07:04:39 +00:00 • committed by Andreas Kling
parent 966058d693
commit 62c7fcd836
1 changed files with 4 additions and 0 deletions
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4
Userland/Libraries/LibGfx/Painter.cpp
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@ -1430,6 +1430,10 @@ FLATTEN void Painter::draw_glyph(FloatPoint point, u32 code_point, Font const& f
FloatRect rect(point.x(), point.y(), scaled_width, scaled_height);
draw_scaled_bitmap(rect.to_rounded<int>(), *glyph.bitmap(), glyph.bitmap()->rect(), 1.0f, ScalingMode::BilinearBlend);
} else if (color.alpha() != 255) {
blit_filtered(glyph_position.blit_position, *glyph.bitmap(), glyph.bitmap()->rect(), [color](Color pixel) -> Color {
return pixel.multiply(color);
});
} else {
blit_filtered(glyph_position.blit_position, *glyph.bitmap(), glyph.bitmap()->rect(), [color](Color pixel) -> Color {
return color.with_alpha(pixel.alpha());