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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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2
Userland/Libraries/LibGfx/Font/WOFF/Font.h
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@ -26,7 +26,7 @@ public:
virtual Gfx::ScaledFontMetrics metrics(float x_scale, float y_scale) const override { return m_input_font->metrics(x_scale, y_scale); }
virtual Gfx::ScaledGlyphMetrics glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const override { return m_input_font->glyph_metrics(glyph_id, x_scale, y_scale); }
virtual float glyphs_horizontal_kerning(u32 left_glyph_id, u32 right_glyph_id, float x_scale) const override { return m_input_font->glyphs_horizontal_kerning(left_glyph_id, right_glyph_id, x_scale); }
virtual RefPtr<Gfx::Bitmap> rasterize_glyph(u32 glyph_id, float x_scale, float y_scale) const override { return m_input_font->rasterize_glyph(glyph_id, x_scale, y_scale); }
virtual RefPtr<Gfx::Bitmap> rasterize_glyph(u32 glyph_id, float x_scale, float y_scale, Gfx::GlyphSubpixelOffset subpixel_offset) const override { return m_input_font->rasterize_glyph(glyph_id, x_scale, y_scale, subpixel_offset); }
virtual u32 glyph_count() const override { return m_input_font->glyph_count(); }
virtual u16 units_per_em() const override { return m_input_font->units_per_em(); }
virtual u32 glyph_id_for_code_point(u32 code_point) const override { return m_input_font->glyph_id_for_code_point(code_point); }