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src/truetype: Add stbtt_GetFontNameDefault

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Alec Murphy 2025-04-05 09:18:31 -04:00
parent 9658412570
commit 7969bf0993
1 changed files with 51 additions and 0 deletions
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51
src/truetype/stb_truetype.h vendored
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@ -1041,6 +1041,12 @@ STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *l
// http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html
// http://www.microsoft.com/typography/otspec/name.htm
STBTT_DEF const char *stbtt_GetFontNameDefault(const stbtt_fontinfo *font, int *length);
// return the default english full name of the font as utf-8
STBTT_DEF const char* stbtt__ConvertUTF16BEtoUTF8(const char* wideSrc, stbtt_int32 srcLen, stbtt_int32* newLen);
// performs a basic conversion of a big endian utf-16 string to a utf-8 string
enum { // platformID
STBTT_PLATFORM_ID_UNICODE =0,
STBTT_PLATFORM_ID_MAC =1,
@ -4842,6 +4848,51 @@ STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *l
return NULL;
}
STBTT_DEF const char* stbtt__ConvertUTF16BEtoUTF8(const char* wideSrc, stbtt_int32 srcLen, stbtt_int32* newLen)
{
char* convStr = (char*) STBTT_malloc(srcLen / 2, NULL);
stbtt_int32 i=0;
while (srcLen) {
stbtt_uint16 ch = wideSrc[0]*256 + wideSrc[1];
if (ch < 0x80) convStr[i++] = ch;
wideSrc += 2;
srcLen -= 2;
}
*newLen = i;
return convStr;
}
// Returns the english full name of the font as UTF-8
STBTT_DEF const char *stbtt_GetFontNameDefault(const stbtt_fontinfo *font, int *length)
{
stbtt_int32 i,count,stringOffset;
stbtt_uint8 *fc = font->data;
stbtt_uint32 offset = font->fontstart;
stbtt_uint32 nm = stbtt__find_table(fc, offset, "name");
if (!nm) return NULL;
count = ttUSHORT(fc+nm+2);
stringOffset = nm + ttUSHORT(fc+nm+4);
for (i=0; i < count; ++i) {
stbtt_uint32 loc = nm + 6 + 12 * i;
if (ttUSHORT(fc+loc+6) != 4) continue;
stbtt_uint16 platformId = ttUSHORT(fc+loc+0);
stbtt_uint16 encodingId = ttUSHORT(fc+loc+2);
stbtt_uint16 languageId = ttUSHORT(fc+loc+4);
if (!(platformId == STBTT_PLATFORM_ID_MAC && languageId == STBTT_MAC_LANG_ENGLISH) && !(platformId == STBTT_PLATFORM_ID_MICROSOFT && languageId == STBTT_MS_LANG_ENGLISH))
continue;
*length = ttUSHORT(fc+loc+8);
const char* str = (const char *) (fc+stringOffset+ttUSHORT(fc+loc+10));
if (platformId == STBTT_PLATFORM_ID_UNICODE || (platformId == STBTT_PLATFORM_ID_MICROSOFT && (encodingId == 1 || encodingId == 10)))
return stbtt__ConvertUTF16BEtoUTF8(str, *length, length);
else
return str;
}
return NULL;
}
static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name, stbtt_int32 nlen, stbtt_int32 target_id, stbtt_int32 next_id)
{
stbtt_int32 i;