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rework GPOS support for old non-declare-anywhere C

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Sean Barrett
Sean Barrett committed Feb 11, 2018
1 parent 6d59a49 commit 0c11c4f1b607cc4e189be8cc59337aba4e7bb4a4
Showing with 58 additions and 35 deletions.
  1. +58 −35 stb_truetype.h
@@ -29,6 +29,7 @@
// Simon Glass
// github:IntellectualKitty
// Imanol Celaya
// Daniel Ribeiro Maciel
//
// Bug/warning reports/fixes:
// "Zer" on mollyrocket Fabian "ryg" Giesen
@@ -48,7 +49,7 @@
//
// VERSION HISTORY
//
// 1.19 (2018-xx-xx) STBTT_fmod
// 1.19 (2018-02-11) GPOS kerning, STBTT_fmod
// 1.18 (2018-01-29) add missing function
// 1.17 (2017-07-23) make more arguments const; doc fix
// 1.16 (2017-07-12) SDF support
@@ -413,7 +414,8 @@ int main(int arg, char **argv)
//// INTEGRATION WITH YOUR CODEBASE
////
//// The following sections allow you to supply alternate definitions
//// of C library functions used by stb_truetype.
//// of C library functions used by stb_truetype, e.g. if you don't
//// link with the C runtime library.
#ifdef STB_TRUETYPE_IMPLEMENTATION
// #define your own (u)stbtt_int8/16/32 before including to override this
@@ -429,7 +431,7 @@ int main(int arg, char **argv)
typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];
// #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
// e.g. #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
#ifndef STBTT_ifloor
#include <math.h>
#define STBTT_ifloor(x) ((int) floor(x))
@@ -2305,9 +2307,10 @@ static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyp
stbtt_int32 l=0, r=glyphCount-1, m;
int straw, needle=glyph;
while (l <= r) {
m = (l + r) >> 1;
stbtt_uint8 *glyphArray = coverageTable + 4;
stbtt_uint16 glyphID = ttUSHORT(glyphArray + 2 * m);
stbtt_uint16 glyphID;
m = (l + r) >> 1;
glyphID = ttUSHORT(glyphArray + 2 * m);
straw = glyphID;
if (needle < straw)
r = m - 1;
@@ -2327,8 +2330,9 @@ static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyp
stbtt_int32 l=0, r=rangeCount-1, m;
int strawStart, strawEnd, needle=glyph;
while (l <= r) {
stbtt_uint8 *rangeRecord;
m = (l + r) >> 1;
stbtt_uint8 *rangeRecord = rangeArray + 6 * m;
rangeRecord = rangeArray + 6 * m;
strawStart = ttUSHORT(rangeRecord);
strawEnd = ttUSHORT(rangeRecord + 2);
if (needle < strawStart)
@@ -2344,7 +2348,7 @@ static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyp
default: {
// There are no other cases.
STBTT_assert(false);
STBTT_assert(0);
} break;
}
@@ -2375,8 +2379,9 @@ static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
stbtt_int32 l=0, r=classRangeCount-1, m;
int strawStart, strawEnd, needle=glyph;
while (l <= r) {
stbtt_uint8 *classRangeRecord;
m = (l + r) >> 1;
stbtt_uint8 *classRangeRecord = classRangeRecords + 6 * m;
classRangeRecord = classRangeRecords + 6 * m;
strawStart = ttUSHORT(classRangeRecord);
strawEnd = ttUSHORT(classRangeRecord + 2);
if (needle < strawStart)
@@ -2392,7 +2397,7 @@ static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
default: {
// There are no other cases.
STBTT_assert(false);
STBTT_assert(0);
} break;
}
@@ -2404,18 +2409,24 @@ static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
{
stbtt_uint16 lookupListOffset;
stbtt_uint8 *lookupList;
stbtt_uint16 lookupCount;
stbtt_uint8 *data;
stbtt_int32 i;
if (!info->gpos) return 0;
stbtt_uint8 *data = info->data + info->gpos;
data = info->data + info->gpos;
if (ttUSHORT(data+0) != 1) return 0; // Major version 1
if (ttUSHORT(data+2) != 0) return 0; // Minor version 0
stbtt_uint16 lookupListOffset = ttUSHORT(data+8);
stbtt_uint8 *lookupList = data + lookupListOffset;
lookupListOffset = ttUSHORT(data+8);
lookupList = data + lookupListOffset;
lookupCount = ttUSHORT(lookupList);
stbtt_uint16 lookupCount = ttUSHORT(lookupList);
for (stbtt_int32 i=0; i<lookupCount; ++i) {
for (i=0; i<lookupCount; ++i) {
stbtt_uint16 lookupOffset = ttUSHORT(lookupList + 2 + 2 * i);
stbtt_uint8 *lookupTable = lookupList + lookupOffset;
@@ -2424,7 +2435,8 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
stbtt_uint8 *subTableOffsets = lookupTable + 6;
switch(lookupType) {
case 2: { // Pair Adjustment Positioning Subtable
for (stbtt_int32 sti=0; sti<subTableCount; sti++) {
stbtt_int32 sti;
for (sti=0; sti<subTableCount; sti++) {
stbtt_uint16 subtableOffset = ttUSHORT(subTableOffsets + 2 * sti);
stbtt_uint8 *table = lookupTable + subtableOffset;
stbtt_uint16 posFormat = ttUSHORT(table);
@@ -2434,30 +2446,35 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
switch (posFormat) {
case 1: {
stbtt_int32 l, r, m;
int straw, needle;
stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
stbtt_int32 valueRecordPairSizeInBytes = 2;
stbtt_uint16 pairSetCount = ttUSHORT(table + 8);
stbtt_uint16 pairPosOffset = ttUSHORT(table + 10 + 2 * coverageIndex);
stbtt_uint8 *pairValueTable = table + pairPosOffset;
stbtt_uint16 pairValueCount = ttUSHORT(pairValueTable);
stbtt_uint8 *pairValueArray = pairValueTable + 2;
// TODO: Support more formats.
STBTT_GPOS_TODO_assert(valueFormat1 == 4);
if (valueFormat1 != 4) return 0;
STBTT_GPOS_TODO_assert(valueFormat2 == 0);
if (valueFormat2 != 0) return 0;
stbtt_int32 valueRecordPairSizeInBytes = 2;
stbtt_uint16 pairSetCount = ttUSHORT(table + 8);
STBTT_assert(coverageIndex < pairSetCount);
stbtt_uint16 pairPosOffset = ttUSHORT(table + 10 + 2 * coverageIndex);
stbtt_uint8 *pairValueTable = table + pairPosOffset;
stbtt_uint16 pairValueCount = ttUSHORT(pairValueTable);
stbtt_uint8 *pairValueArray = pairValueTable + 2;
needle=glyph2;
r=pairValueCount-1;
l=0;
// Binary search.
stbtt_int32 l=0, r=pairValueCount-1, m;
int straw, needle=glyph2;
while (l <= r) {
stbtt_uint16 secondGlyph;
stbtt_uint8 *pairValue;
m = (l + r) >> 1;
stbtt_uint8 *pairValue = pairValueArray + (2 + valueRecordPairSizeInBytes) * m;
stbtt_uint16 secondGlyph = ttUSHORT(pairValue);
pairValue = pairValueArray + (2 + valueRecordPairSizeInBytes) * m;
secondGlyph = ttUSHORT(pairValue);
straw = secondGlyph;
if (needle < straw)
r = m - 1;
@@ -2473,11 +2490,6 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
case 2: {
stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
// TODO: Support more formats.
STBTT_GPOS_TODO_assert(valueFormat1 == 4);
if (valueFormat1 != 4) return 0;
STBTT_GPOS_TODO_assert(valueFormat2 == 0);
if (valueFormat2 != 0) return 0;
stbtt_uint16 classDef1Offset = ttUSHORT(table + 8);
stbtt_uint16 classDef2Offset = ttUSHORT(table + 10);
@@ -2489,6 +2501,12 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
STBTT_assert(glyph1class < class1Count);
STBTT_assert(glyph2class < class2Count);
// TODO: Support more formats.
STBTT_GPOS_TODO_assert(valueFormat1 == 4);
if (valueFormat1 != 4) return 0;
STBTT_GPOS_TODO_assert(valueFormat2 == 0);
if (valueFormat2 != 0) return 0;
if (glyph1class >= 0 && glyph1class < class1Count && glyph2class >= 0 && glyph2class < class2Count) {
stbtt_uint8 *class1Records = table + 16;
stbtt_uint8 *class2Records = class1Records + 2 * (glyph1class * class2Count);
@@ -2499,15 +2517,17 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
default: {
// There are no other cases.
STBTT_assert(false);
} break;
STBTT_assert(0);
break;
};
}
}
} break;
break;
};
default: {
default:
// TODO: Implement other stuff.
} break;
break;
}
}
@@ -4735,6 +4755,9 @@ STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const
// FULL VERSION HISTORY
//
// 1.19 (2018-02-11) OpenType GPOS kerning (horizontal only), STBTT_fmod
// 1.18 (2018-01-29) add missing function
// 1.17 (2017-07-23) make more arguments const; doc fix
// 1.16 (2017-07-12) SDF support
// 1.15 (2017-03-03) make more arguments const
// 1.14 (2017-01-16) num-fonts-in-TTC function

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