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System/Utilities/TrueType: Add TrueType font support via stb_truetype.h

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Alec Murphy 2025-04-04 18:20:36 -04:00
parent 172b4ce7a3
commit 356c16580c
5 changed files with 5212 additions and 1 deletions
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4
System/MakeSystem.HC
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@ -28,6 +28,10 @@ WinToTop(adam_task);
#include "Utilities/Image";
load_elf("M:/build/bin/image");
// stb_truetype library
#include "Utilities/TrueType";
load_elf("M:/build/bin/truetype");
// Jakt support files
#include "Jakt/OS";
#include "Jakt/IOPort";

50
System/Utilities/TrueType.HC Normal file
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@ -0,0 +1,50 @@
class stbtt__buf {
U8* data;
I32 cursor;
I32 size;
};
class stbtt_fontinfo {
U8* userdata;
U8* data; // pointer to .ttf file
I32 fontstart; // offset of start of font
I32 numGlyphs; // number of glyphs, needed for range checking
I32 loca, head, glyf, hhea, hmtx, kern, gpos, svg; // table locations as offset from start of .ttf
I32 index_map; // a cmap mapping for our chosen character encoding
I32 indexToLocFormat; // format needed to map from glyph index to glyph
stbtt__buf cff; // cff font data
stbtt__buf charstrings; // the charstring index
stbtt__buf gsubrs; // global charstring subroutines index
stbtt__buf subrs; // private charstring subroutines index
stbtt__buf fontdicts; // array of font dicts
stbtt__buf fdselect; // map from glyph to fontdict
};
I32 @stbtt_InitFont(stbtt_fontinfo* info, U8* data, I32 offset)
{
U64 reg RDI rdi = info;
U64 reg RSI rsi = data;
U64 reg RDX rdx = offset;
no_warn rdi, rsi, rdx;
asm {
MOV RAX, STBTT_INITFONT
CALL RAX
}
}
U8* @stbtt_RenderText(stbtt_fontinfo* info, I32 b_w, I32 b_h, I32 l_h, U8* word)
{
U64 reg RDI rdi = info;
U64 reg RSI rsi = b_w;
U64 reg RDX rdx = b_h;
U64 reg RCX rcx = l_h;
U64 reg R8 r8 = word;
no_warn rdi, rsi, rdx, rcx, r8;
asm {
MOV RAX, STBTT_RENDERTEXT
CALL RAX
}
}
"truetype ";