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LibGfx: Speed up filling solid colors in path rasterizer

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For solid color fills (with alpha = 255), the rasterizer now tracks
spans of solid colors within a scanline and fills the entire span with
a single call to fast_u32_fill().

This gave up to a 1.5x speedup drawing the Ghostscript Tiger within
SerenityOS.
This commit is contained in:
MacDue 2024-01-02 20:37:15 +00:00 • committed by Andreas Kling
parent 2fa488cfa9
commit 096bdb142b
2 changed files with 106 additions and 34 deletions
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11
Userland/Libraries/LibGfx/EdgeFlagPathRasterizer.h
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@ -167,10 +167,17 @@ private:
void fill_internal(Painter&, Path const&, auto color_or_function, Painter::WindingRule, FloatPoint offset);
Detail::Edge* plot_edges_for_scanline(int scanline, auto plot_edge, EdgeExtent&, Detail::Edge* active_edges = nullptr);
void accumulate_even_odd_scanline(Painter&, int scanline, EdgeExtent, auto& color_or_function);
void accumulate_non_zero_scanline(Painter&, int scanline, EdgeExtent, auto& color_or_function);
template<Painter::WindingRule>
void write_scanline(Painter&, int scanline, EdgeExtent, auto& color_or_function);
Color scanline_color(int scanline, int offset, u8 alpha, auto& color_or_function);
void write_pixel(Painter&, int scanline, int offset, SampleType sample, auto& color_or_function);
void fast_fill_solid_color_span(Painter&, int scanline, int start, int end, Color color);
template<Painter::WindingRule, typename Callback>
void accumulate_scanline(EdgeExtent, Callback);
void accumulate_even_odd_scanline(EdgeExtent, auto sample_callback);
void accumulate_non_zero_scanline(EdgeExtent, auto sample_callback);
struct WindingCounts {
// NOTE: This only allows up to 256 winding levels. Increase this if required (i.e. to an i16).