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LibGfx: Speed up fill_path() with per scanline clipping & fast fills

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This improves fill_path() performance by adding an API to the painter
that allows painting an entire scanline rather than just a pixel.
With this paths can be clipped a scanline at a time rather than each
pixel, removing a fair amount of checks.

Along with optimized clipping, this can now use a fast_u32_fill() to
paint all but the subpixels of a scanline if a solid color with no
alpha channel is used (which is quite common in SVGs).

This reduces scrolling around on svg.html from 21% in set_pixel() and
19% in fill_path() to just 7.8% in fill_path (with set_pixel()
eliminated). Now fill_path() is far from the slowest code when
scrolling the page.
This commit is contained in:
MacDue 2023-03-08 20:49:00 +01:00 • committed by Linus Groh
parent be958a14cf
commit b1a72d66f6
4 changed files with 81 additions and 23 deletions
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3
Userland/Libraries/LibGfx/Painter.cpp
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@ -2393,8 +2393,7 @@ void Painter::stroke_path(Path const& path, Color color, int thickness)
void Painter::fill_path(Path const& path, Color color, WindingRule winding_rule)
{
VERIFY(scale() == 1); // FIXME: Add scaling support.
Detail::fill_path<Detail::FillPathMode::PlaceOnIntGrid>(
*this, path, [=](IntPoint) { return color; }, winding_rule);
Detail::fill_path<Detail::FillPathMode::PlaceOnIntGrid>(*this, path, color, winding_rule);
}
void Painter::fill_path(Path const& path, PaintStyle const& paint_style, Painter::WindingRule rule)