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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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4
Userland/Libraries/LibGfx/Font/BitmapFont.h
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@ -52,6 +52,10 @@ public:
void set_slope(u8 slope) { m_slope = slope; }
Glyph glyph(u32 code_point) const override;
Glyph glyph(u32 code_point, GlyphSubpixelOffset) const override { return glyph(code_point); }
float glyph_left_bearing(u32) const override { return 0; }
Glyph raw_glyph(u32 code_point) const;
bool contains_glyph(u32 code_point) const override;
bool contains_raw_glyph(u32 code_point) const { return m_glyph_widths[code_point] > 0; }