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stb_truetype: Support reading OS/2 vertical metrics 

...as present in MS TrueType files. Since this table is optional,
the new stbtt_GetFontVMetricsOS2 has a return value and can fail.
This is a replacement for pull request #463.

Fixes #463.
This commit is contained in:
Fabian Giesen 2017-07-22 19:24:41 -07:00
parent 49c7f1b397
commit 30c7c6b583
1 changed files with 19 additions and 0 deletions
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19
stb_truetype.h
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@ -27,6 +27,7 @@
// Ryan Gordon
// Simon Glass
// github:IntellectualKitty
// Imanol Celaya
//
// Bug/warning reports/fixes:
// "Zer" on mollyrocket
@ -112,6 +113,7 @@
// Character advance/positioning
// stbtt_GetCodepointHMetrics()
// stbtt_GetFontVMetrics()
// stbtt_GetFontVMetricsOS2()
// stbtt_GetCodepointKernAdvance()
//
// Starting with version 1.06, the rasterizer was replaced with a new,
@ -729,6 +731,12 @@ STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, in
// these are expressed in unscaled coordinates, so you must multiply by
// the scale factor for a given size
STBTT_DEF int stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap);
// analogous to GetFontVMetrics, but returns the "typographic" values from the OS/2
// table (specific to MS/Windows TTF files).
//
// Returns 1 on success (table present), 0 on failure.
STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1);
// the bounding box around all possible characters
@ -2278,6 +2286,17 @@ STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, in
if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8);
}
STBTT_DEF int stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap)
{
int tab = stbtt__find_table(info->data, info->fontstart, "OS/2");
if (!tab)
return 0;
if (typoAscent ) *typoAscent = ttSHORT(info->data+tab + 68);
if (typoDescent) *typoDescent = ttSHORT(info->data+tab + 70);
if (typoLineGap) *typoLineGap = ttSHORT(info->data+tab + 72);
return 1;
}
STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1)
{
*x0 = ttSHORT(info->data + info->head + 36);