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LibGfx: Implement new antialiased filled path rasterizer

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This is an implementation of the scanline edge-flag algorithm for
antialiased path filling described here:
https://mlab.taik.fi/~kkallio/antialiasing/EdgeFlagAA.pdf

The initial implementation does not try to implement every possible
optimization in favour of keeping things simple. However, it does
support:

   - Both evenodd and nonzero fill rules
   - Applying paint styles/gradients
   - A range of samples per pixel (8, 16, 32)
   - Very nice antialiasing :^)

This replaces the previous path filling code, that only really applied
antialiasing in the x-axis.

There's some very nice improvements around the web with this change,
especially for small icons. Strokes are still a bit wonky, as they don't
yet use this rasterizer, but I think it should be possible to convert
them to do so.
This commit is contained in:
MacDue 2023-05-31 19:02:00 +01:00 • committed by Andreas Kling
parent e4adaa2d20
commit 48fa8f97d3
6 changed files with 536 additions and 324 deletions
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13
Userland/Libraries/LibGfx/AntiAliasingPainter.cpp
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@ -207,19 +207,6 @@ void AntiAliasingPainter::draw_line(FloatPoint actual_from, FloatPoint actual_to
draw_anti_aliased_line<FixmeEnableHacksForBetterPathPainting::No>(actual_from, actual_to, color, thickness, style, alternate_color, line_length_mode);
}
// FIXME: In the fill_paths() m_transform.translation() throws away any other transforms
// this currently does not matter -- but may in future.
void AntiAliasingPainter::fill_path(Path const& path, Color color, Painter::WindingRule rule)
{
m_underlying_painter.antialiased_fill_path(path, color, rule, m_transform.translation());
}
void AntiAliasingPainter::fill_path(Path const& path, PaintStyle const& paint_style, Painter::WindingRule rule)
{
m_underlying_painter.antialiased_fill_path(path, paint_style, rule, m_transform.translation());
}
void AntiAliasingPainter::stroke_path(Path const& path, Color color, float thickness)
{
FloatPoint cursor;