71 lines
3.0 KiB
Markdown
71 lines
3.0 KiB
Markdown
# kb
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[Single-header](https://github.com/nothings/stb/blob/master/docs/stb_howto.txt) permissively-licensed libraries for C/C++.
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## Libraries
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- [kb\_text\_shape.h](./kb_text_shape.h): Unicode text segmentation and OpenType shaping
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## kb_text_shape.h
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[kb\_text\_shape.h](./kb_text_shape.h) provides:
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- ICU-like text segmentation (i.e. breaking Unicode text by direction, line, script, word and grapheme).
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- Harfbuzz-like text shaping for OpenType fonts, which means it is capable of handling complex script layout and ligatures, among other things.
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- Font coverage checking: know if a font can display a given string.
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It does **not** handle rasterization. It does **not** handle paragraph layout. It does **not** handle selection and loading of system fonts. It will only help you know which glyphs to display where on a single, infinitely-long line, using the fonts you have provided!
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(See https://www.newroadoldway.com/text1.html for an explanation of the different steps of text processing.)
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For an in-depth usage example, check out [refpad](https://github.com/JimmyLefevre/refpad).
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```c
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// Yours to provide:
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void DrawGlyph(kbts_u16 GlyphId, kbts_s32 GlyphOffsetX, kbts_s32 GlyphOffsetY, kbts_s32 GlyphAdvanceX, kbts_s32 GlyphAdvanceY,
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kbts_direction ParagraphDirection, kbts_direction RunDirection, kbts_script Script, kbts_font *Font);
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void NextLine(void);
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void *CreateRenderFont(const char *FontPath);
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void HandleText(kbts_shape_context *Context, const char *Text, kbts_language Language)
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{
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kbts_ShapeBegin(Context, KBTS_DIRECTION_DONT_KNOW, Language);
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kbts_ShapeUtf8(Context, Text, (int)strlen(Text), KBTS_USER_ID_GENERATION_MODE_CODEPOINT_INDEX);
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kbts_ShapeEnd(Context);
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kbts_run Run;
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while(kbts_ShapeRun(Context, &Run))
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{
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if(Run.Flags & KBTS_BREAK_FLAG_LINE_HARD)
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{
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NextLine();
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}
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kbts_glyph *Glyph;
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while(kbts_GlyphIteratorNext(&Run.Glyphs, &Glyph))
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{
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DrawGlyph(Glyph->Id, Glyph->OffsetX, Glyph->OffsetY, Glyph->AdvanceX, Glyph->AdvanceY,
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Run.ParagraphDirection, Run.Direction, Run.Script, Run.Font);
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}
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}
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}
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void Example(void)
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{
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kbts_shape_context *Context = kbts_CreateShapeContext(0, 0);
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kbts_font *FontA = kbts_ShapePushFontFromFile(Context, "NotoSansMyanmar-Regular.ttf", 0);
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kbts_font *FontB = kbts_ShapePushFontFromFile(Context, "NotoSansArabic-Regular.ttf", 0);
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FontA->UserData = CreateRenderFont("NotoSansMyanmar-Regular.ttf");
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FontB->UserData = CreateRenderFont("NotoSansArabic-Regular.ttf");
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HandleText(Context, (const char *)u8"یکအမည်မရှိیک", KBTS_LANGUAGE_ARABIC);
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}
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```
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