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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.h
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@ -18,10 +18,15 @@ public:
void draw_path(Gfx::Path&);
RefPtr<Gfx::Bitmap> accumulate();
void translate(Gfx::FloatPoint delta) { m_translation.translate_by(delta); }
Gfx::FloatPoint translation() const { return m_translation; }
private:
void draw_line(Gfx::FloatPoint, Gfx::FloatPoint);
Gfx::IntSize m_size;
Gfx::FloatPoint m_translation;
Vector<float> m_data;
};