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Add function to get the number of fonts in a TrueType file

This commit is contained in:
IntellectualKitty 2016-12-04 17:06:17 -07:00 committed by GitHub
parent 996ccf2159
commit 75a8fd9d41
1 changed files with 29 additions and 1 deletions
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30
stb_truetype.h
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@ -95,7 +95,8 @@
// //
// "Load" a font file from a memory buffer (you have to keep the buffer loaded) // "Load" a font file from a memory buffer (you have to keep the buffer loaded)
// stbtt_InitFont() // stbtt_InitFont()
// stbtt_GetFontOffsetForIndex() -- use for TTC font collections // stbtt_GetFontOffsetForIndex() -- indexing for TTC font collections
// stbtt_GetNumberOfFonts() -- number of fonts for TTC font collections
// //
// Render a unicode codepoint to a bitmap // Render a unicode codepoint to a bitmap
// stbtt_GetCodepointBitmap() -- allocates and returns a bitmap // stbtt_GetCodepointBitmap() -- allocates and returns a bitmap
@ -629,6 +630,12 @@ STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
// return '0' for index 0, and -1 for all other indices. You can just skip // return '0' for index 0, and -1 for all other indices. You can just skip
// this step if you know it's that kind of font. // this step if you know it's that kind of font.
STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data);
// This function will determine the number of fonts in a font file. TrueType
// collection (.ttc) files may contain multiple fonts, while TrueType font
// (.ttf) files only contain one font. The number of fonts can be used for
// indexing with the previous function where the index is between zero and one
// less than the total fonts. If an error occurs, -1 is returned.
// The following structure is defined publically so you can declare one on // The following structure is defined publically so you can declare one on
// the stack or as a global or etc, but you should treat it as opaque. // the stack or as a global or etc, but you should treat it as opaque.
@ -1014,6 +1021,22 @@ static int stbtt_GetFontOffsetForIndex_internal(unsigned char *font_collection,
return -1; return -1;
} }
static int stbtt_GetNumberOfFonts_internal(unsigned char *font_collection)
{
// if it's just a font, there's only one valid font
if (stbtt__isfont(font_collection))
return 1;
// check if it's a TTC
if (stbtt_tag(font_collection, "ttcf")) {
// version 1?
if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
return ttLONG(font_collection+8);
}
}
return -1;
}
static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, int fontstart) static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, int fontstart)
{ {
stbtt_uint32 cmap, t; stbtt_uint32 cmap, t;
@ -3214,6 +3237,11 @@ STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index)
return stbtt_GetFontOffsetForIndex_internal((unsigned char *) data, index); return stbtt_GetFontOffsetForIndex_internal((unsigned char *) data, index);
} }
STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data)
{
return stbtt_GetNumberOfFonts_internal((unsigned char *) data);
}
STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset) STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset)
{ {
return stbtt_InitFont_internal(info, (unsigned char *) data, offset); return stbtt_InitFont_internal(info, (unsigned char *) data, offset);