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Add functions to extract SVG glyphs from font.

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The fucntions are:
stbtt_GetCodepointSVG - provides a pointer to the SVG data in the supplied argument, and returns the length of this data
stbtt_GetGlyphSVG - As above but takes the glyph index instead of the codepoint
Note that the returned data may be deflate compressed.
This commit is contained in:
Chris Young 2019-04-09 15:40:04 +01:00
parent 2c2908f505
commit 0a1016331c
1 changed files with 52 additions and 1 deletions
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53
stb_truetype.h
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@ -702,7 +702,7 @@ struct stbtt_fontinfo
int numGlyphs; // number of glyphs, needed for range checking
int loca,head,glyf,hhea,hmtx,kern,gpos; // table locations as offset from start of .ttf
int loca,head,glyf,hhea,hmtx,kern,gpos,svg; // table locations as offset from start of .ttf
int index_map; // a cmap mapping for our chosen character encoding
int indexToLocFormat; // format needed to map from glyph index to glyph
@ -829,6 +829,11 @@ STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, s
STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
// frees the data allocated above
STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg);
STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg);
// fills svg with the font's SVG data.
// returns data size or 0 if SVG not found.
//////////////////////////////////////////////////////////////////////////////
//
// BITMAP RENDERING
@ -1409,6 +1414,14 @@ static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, in
else
info->numGlyphs = 0xffff;
t = stbtt__find_table(data, fontstart, "SVG ");
if (t) {
stbtt_uint32 offset = ttULONG(data + t + 2);
info->svg = t + offset;
} else {
info->svg = 0;
}
// find a cmap encoding table we understand *now* to avoid searching
// later. (todo: could make this installable)
// the same regardless of glyph.
@ -2602,6 +2615,44 @@ STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
STBTT_free(v, info->userdata);
}
STBTT_DEF stbtt_uint8 *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl)
{
stbtt_uint8 *data = info->data;
stbtt_uint8 *svg_doc_list = data + info->svg;
int numEntries = ttUSHORT(svg_doc_list);
stbtt_uint8 *svg_docs = svg_doc_list + 2;
for(int i=0; i<numEntries; i++) {
stbtt_uint8 *svg_doc = svg_docs + (12 * i);
printf("%lx - %lx - %lx %lx\n", ttUSHORT(svg_doc), ttUSHORT(svg_doc + 2), ttULONG(svg_doc + 4), ttULONG(svg_doc + 8));
if((gl >= ttUSHORT(svg_doc)) && (gl <= ttUSHORT(svg_doc + 2)))
return svg_doc;
}
return 0;
}
STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg)
{
stbtt_uint8 *data = info->data;
stbtt_uint8 *svg_doc;
if(info->svg == 0)
return 0;
if(svg_doc = stbtt_FindSVGDoc(info, gl)) {
*svg = (void *)data + info->svg + ttULONG(svg_doc + 4);
return ttULONG(svg_doc + 8);
} else {
return 0;
}
}
STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg)
{
return stbtt_GetGlyphSVG(info, stbtt_FindGlyphIndex(info, unicode_codepoint), svg);
}
//////////////////////////////////////////////////////////////////////////////
//
// antialiasing software rasterizer