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Initial (WIP) Harfbuzz text shaping integration.

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This a significant refactor / rewrite of much of the love.graphics Font code.
Text positioning is now split into TextShaper classes in the love.font module. This isn't exposed to users yet.
BMFonts and ImageFonts use the same text shaping as before (in the new TextShaper API). Fonts loaded via FreeType now use Harfbuzz for text shaping.

The new code isn't at feature-parity with the old code yet. Harfbuzz-based text shaping enables kerning support in more fonts, character combining into ligature glyphs, and directions other than left-to-right (this isn't supported in love yet).
This commit is contained in:
Sasha Szpakowski
2022-12-26 19:06:08 -04:00
parent 9086afb718
commit 7a0f6621e7
27 changed files with 1490 additions and 626 deletions
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src/modules/font/BMFontRasterizer.h
+9 -3
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@@ -47,11 +47,14 @@ public:
// Implements Rasterizer.
int getLineHeight() const override;
GlyphData *getGlyphData(uint32 glyph) const override;
int getGlyphSpacing(uint32 glyph) const override;
int getGlyphIndex(uint32 glyph) const override;
GlyphData *getGlyphDataForIndex(int index) const override;
int getGlyphCount() const override;
bool hasGlyph(uint32 glyph) const override;
float getKerning(uint32 leftglyph, uint32 rightglyph) const override;
DataType getDataType() const override;
TextShaper *newTextShaper() override;
static bool accepts(love::filesystem::FileData *fontdef);
@@ -63,6 +66,7 @@ private:
int y;
int page;
GlyphMetrics metrics;
uint32 glyph;
};
void parseConfig(const std::string &config);
@@ -72,8 +76,10 @@ private:
// Image pages, indexed by their page id.
std::unordered_map<int, StrongRef<image::ImageData>> images;
// Glyph characters, indexed by their glyph id.
std::unordered_map<uint32, BMFontCharacter> characters;
std::vector<BMFontCharacter> characters;
// Glyph character indices, indexed by their glyph id.
std::unordered_map<uint32, int> characterIndices;
// Kerning information, indexed by two (packed) characters.
std::unordered_map<uint64, int> kerning;