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LibGfx: Add ability to request glyphs at subpixel offsets to fonts

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This adds the option to pass a subpixel offset when fetching a glyph
from a font, this offset is currently snapped to thirds of a pixel
(i.e. 0, 0.33, 0.66). This is then used when rasterizing the glyph,
which is then cached like usual.

Note that when using subpixel offsets you're trading a bit of space
for accuracy. With the current third of a pixel offsets you can end
up with up to 9 bitmaps per glyph.
This commit is contained in:
MacDue 2023-01-02 20:10:00 +01:00 • committed by Andreas Kling
parent a1726b1ba5
commit ada48a1daf
14 changed files with 121 additions and 21 deletions
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5
Userland/Libraries/LibGfx/Font/PathRasterizer.cpp
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@ -19,9 +19,8 @@ PathRasterizer::PathRasterizer(Gfx::IntSize size)
void PathRasterizer::draw_path(Gfx::Path& path)
{
for (auto& line : path.split_lines()) {
draw_line(line.from, line.to);
}
for (auto& line : path.split_lines())
draw_line(line.from.translated(translation()), line.to.translated(translation()));
}
RefPtr<Gfx::Bitmap> PathRasterizer::accumulate()