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LibGfx: Improve glyph rendering speed for vector fonts

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The glyph bitmap is a grayscale image that is multiplied with the
requested color provided to `Gfx::Painter::draw_glyph()` to get the
final glyph bitmap that can be blitted.

Using `Gfx::Color::multiply()` is unnecessary however: by simply taking
the destination color and copying over the glyph bitmap's alpha value,
we can prevent four multiplications and divisions per pixel.

In an artifical benchmark I wrote, this improved glyph rendering
performance by ~9%.
This commit is contained in:
Jelle Raaijmakers 2023-05-31 22:01:43 +02:00 committed by Andreas Kling
parent 8a40b49b8b
commit 5339b54b5d
Notes: sideshowbarker 2024-07-17 20:58:35 +09:00 
Author: https://github.com/gmta
Commit: https://github.com/SerenityOS/serenity/commit/5339b54b5d
Pull-request: https://github.com/SerenityOS/serenity/pull/19189
1 changed files with 1 additions and 1 deletions
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2
Userland/Libraries/LibGfx/Painter.cpp
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@ -1432,7 +1432,7 @@ FLATTEN void Painter::draw_glyph(FloatPoint point, u32 code_point, Font const& f
draw_scaled_bitmap(rect.to_rounded<int>(), *glyph.bitmap(), glyph.bitmap()->rect(), 1.0f, ScalingMode::BilinearBlend);
} else {
blit_filtered(glyph_position.blit_position, *glyph.bitmap(), glyph.bitmap()->rect(), [color](Color pixel) -> Color {
return pixel.multiply(color);
return color.with_alpha(pixel.alpha());
});
}
}