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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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Userland/Libraries/LibGfx/CMakeLists.txt
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@ -16,6 +16,7 @@ set(SOURCES
Filters/StackBlurFilter.cpp
Font/BitmapFont.cpp
Font/Emoji.cpp
Font/Font.cpp
Font/FontDatabase.cpp
Font/OpenType/Cmap.cpp
Font/OpenType/Font.cpp