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LibGfx: Clip path rasterizer scanlines sooner

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This moves the clipping from per-pixel/draw command to a step before
the main drawing/plotting loop.
This commit is contained in:
MacDue 2024-01-06 13:45:45 +00:00 • committed by Andreas Kling
parent b1adabdac4
commit e2152a5b3d
2 changed files with 77 additions and 37 deletions
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31
Userland/Libraries/LibGfx/EdgeFlagPathRasterizer.h
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@ -163,6 +163,13 @@ private:
struct EdgeExtent {
int min_x;
int max_x;
template<typename T>
void memset_extent(T* data, int value)
{
if (min_x <= max_x)
memset(data + min_x, value, (max_x - min_x + 1) * sizeof(T));
}
};
void fill_internal(Painter&, Path const&, auto color_or_function, Painter::WindingRule, FloatPoint offset);
@ -171,19 +178,33 @@ private:
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);
void write_pixel(BitmapFormat format, ARGB32* scanline_ptr, int scanline, int offset, SampleType sample, auto& color_or_function);
void fast_fill_solid_color_span(ARGB32* scanline_ptr, 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);
auto accumulate_scanline(EdgeExtent, auto, Callback);
auto accumulate_even_odd_scanline(EdgeExtent, auto, auto sample_callback);
auto accumulate_non_zero_scanline(EdgeExtent, auto, auto sample_callback);
struct WindingCounts {
// NOTE: This only allows up to 256 winding levels. Increase this if required (i.e. to an i16).
i8 counts[SamplesPerPixel];
};
struct NonZeroAcc {
SampleType sample;
WindingCounts winding;
};
template<Painter::WindingRule WindingRule>
constexpr auto initial_acc() const
{
if constexpr (WindingRule == Painter::WindingRule::EvenOdd)
return SampleType {};
else
return NonZeroAcc {};
}
IntSize m_size;
IntPoint m_blit_origin;
IntRect m_clip;