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text: support type 4 cmaps, old Microsoft fonts

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This commit is contained in:
K Lange 2021-07-14 21:46:40 +09:00
parent e154c0d5a1
commit f47284ce7e
1 changed files with 48 additions and 17 deletions
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65
lib/text.c
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@ -82,6 +82,8 @@ struct TT_Font {
float scale;
float emSize;
int cmap_type;
};
@ -365,17 +367,46 @@ off_t tt_get_glyph_offset(struct TT_Font * font, unsigned int glyph) {
}
int tt_glyph_for_codepoint(struct TT_Font * font, unsigned int codepoint) {
/* Get group count */
tt_seek(font, font->cmap_start + 8);
uint32_t ngroups = tt_read_32(font);
if (font->cmap_type == 12) {
/* Get group count */
tt_seek(font, font->cmap_start + 4 + 8);
uint32_t ngroups = tt_read_32(font);
for (unsigned int i = 0; i < ngroups; ++i) {
uint32_t start = tt_read_32(font);
uint32_t end = tt_read_32(font);
uint32_t ind = tt_read_32(font);
for (unsigned int i = 0; i < ngroups; ++i) {
uint32_t start = tt_read_32(font);
uint32_t end = tt_read_32(font);
uint32_t ind = tt_read_32(font);
if (codepoint >= start && codepoint <= end) {
return ind + (codepoint - start);
if (codepoint >= start && codepoint <= end) {
return ind + (codepoint - start);
}
}
} else if (font->cmap_type == 4) {
if (codepoint > 0xFFFF) return 0;
tt_seek(font, font->cmap_start + 6);
uint16_t segCount = tt_read_16(font) / 2;
for (int i = 0; i < segCount; ++i) {
tt_seek(font, font->cmap_start + 12 + 2 * i);
uint16_t endCode = tt_read_16(font);
if (endCode >= codepoint) {
tt_seek(font, font->cmap_start + 12 + 2 * segCount + 2 + 2 * i);
uint16_t startCode = tt_read_16(font);
if (startCode > codepoint) {
return 0;
}
tt_seek(font, font->cmap_start + 12 + 4 * segCount + 2 + 2 * i);
int16_t idDelta = tt_read_16(font);
tt_seek(font, font->cmap_start + 12 + 6 * segCount + 2 + 2 * i);
uint16_t idRangeOffset = tt_read_16(font);
if (idRangeOffset == 0) {
return idDelta + codepoint;
} else {
tt_seek(font, font->cmap_start + 12 + 6 * segCount + 2 + 2 * i + idRangeOffset + (codepoint - startCode) * 2);
return tt_read_16(font);
}
}
}
}
@ -723,33 +754,33 @@ static int tt_font_load(struct TT_Font * font) {
uint16_t type = tt_read_16(font);
uint32_t offset = tt_read_32(font);
if (platform == 3 && type == 10) {
if ((platform == 3 || platform == 0) && type == 10) {
best = offset;
bestScore = 4;
} else if (platform == 0 && type == 4) {
best = offset;
bestScore = 4;
} else if (platform == 0 && type == 3 && bestScore < 2) {
} else if (((platform == 0 && type == 3) || (platform == 3 && type == 1)) && bestScore < 2) {
best = offset;
bestScore = 2;
}
}
if (!best || bestScore != 4) {
fprintf(stderr, "tt: TODO: unsupported cmap\n");
if (!best) {
fprintf(stderr, "tt: TODO: unsupported cmap (best = %#x bestScore = %d)\n", best, bestScore);
goto _fail_free;
}
/* What type is this */
tt_seek(font, font->cmap_ptr.offset + best);
uint16_t cmap_type = tt_read_16(font);
if (cmap_type != 12) {
fprintf(stderr, "tt: TODO: unsupported cmap indexing\n");
font->cmap_type = tt_read_16(font);
if (font->cmap_type != 12 && font->cmap_type != 4) {
fprintf(stderr, "tt: TODO: unsupported cmap indexing %d\n", font->cmap_type);
goto _fail_free;
}
font->cmap_start = font->cmap_ptr.offset + best + 4;
font->cmap_start = font->cmap_ptr.offset + best;
return 1;