mirror of
https://github.com/nothings/stb
synced 2025-01-18 20:29:20 +03:00
rework GPOS support for old non-declare-anywhere C
This commit is contained in:
Sean Barrett
parent
6d59a4913f
commit
0c11c4f1b6
@ -29,6 +29,7 @@
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// Simon Glass
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// github:IntellectualKitty
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// Imanol Celaya
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// Daniel Ribeiro Maciel
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//
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// Bug/warning reports/fixes:
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// "Zer" on mollyrocket Fabian "ryg" Giesen
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@ -48,7 +49,7 @@
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//
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// VERSION HISTORY
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//
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// 1.19 (2018-xx-xx) STBTT_fmod
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// 1.19 (2018-02-11) GPOS kerning, STBTT_fmod
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// 1.18 (2018-01-29) add missing function
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// 1.17 (2017-07-23) make more arguments const; doc fix
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// 1.16 (2017-07-12) SDF support
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@ -413,7 +414,8 @@ int main(int arg, char **argv)
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//// INTEGRATION WITH YOUR CODEBASE
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////
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//// The following sections allow you to supply alternate definitions
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//// of C library functions used by stb_truetype.
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//// of C library functions used by stb_truetype, e.g. if you don't
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//// link with the C runtime library.
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#ifdef STB_TRUETYPE_IMPLEMENTATION
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// #define your own (u)stbtt_int8/16/32 before including to override this
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@ -429,7 +431,7 @@ int main(int arg, char **argv)
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typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
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typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];
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// #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
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// e.g. #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
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#ifndef STBTT_ifloor
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#include <math.h>
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#define STBTT_ifloor(x) ((int) floor(x))
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@ -2305,9 +2307,10 @@ static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyp
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stbtt_int32 l=0, r=glyphCount-1, m;
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int straw, needle=glyph;
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while (l <= r) {
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m = (l + r) >> 1;
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stbtt_uint8 *glyphArray = coverageTable + 4;
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stbtt_uint16 glyphID = ttUSHORT(glyphArray + 2 * m);
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stbtt_uint16 glyphID;
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m = (l + r) >> 1;
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glyphID = ttUSHORT(glyphArray + 2 * m);
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straw = glyphID;
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if (needle < straw)
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r = m - 1;
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@ -2327,8 +2330,9 @@ static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyp
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stbtt_int32 l=0, r=rangeCount-1, m;
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int strawStart, strawEnd, needle=glyph;
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while (l <= r) {
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stbtt_uint8 *rangeRecord;
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m = (l + r) >> 1;
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stbtt_uint8 *rangeRecord = rangeArray + 6 * m;
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rangeRecord = rangeArray + 6 * m;
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strawStart = ttUSHORT(rangeRecord);
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strawEnd = ttUSHORT(rangeRecord + 2);
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if (needle < strawStart)
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@ -2344,7 +2348,7 @@ static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyp
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default: {
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// There are no other cases.
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STBTT_assert(false);
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STBTT_assert(0);
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} break;
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}
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@ -2375,8 +2379,9 @@ static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
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stbtt_int32 l=0, r=classRangeCount-1, m;
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int strawStart, strawEnd, needle=glyph;
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while (l <= r) {
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stbtt_uint8 *classRangeRecord;
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m = (l + r) >> 1;
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stbtt_uint8 *classRangeRecord = classRangeRecords + 6 * m;
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classRangeRecord = classRangeRecords + 6 * m;
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strawStart = ttUSHORT(classRangeRecord);
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strawEnd = ttUSHORT(classRangeRecord + 2);
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if (needle < strawStart)
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@ -2392,7 +2397,7 @@ static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
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default: {
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// There are no other cases.
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STBTT_assert(false);
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STBTT_assert(0);
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} break;
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}
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@ -2404,18 +2409,24 @@ static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
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static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
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{
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stbtt_uint16 lookupListOffset;
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stbtt_uint8 *lookupList;
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stbtt_uint16 lookupCount;
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stbtt_uint8 *data;
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stbtt_int32 i;
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if (!info->gpos) return 0;
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stbtt_uint8 *data = info->data + info->gpos;
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data = info->data + info->gpos;
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if (ttUSHORT(data+0) != 1) return 0; // Major version 1
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if (ttUSHORT(data+2) != 0) return 0; // Minor version 0
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stbtt_uint16 lookupListOffset = ttUSHORT(data+8);
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stbtt_uint8 *lookupList = data + lookupListOffset;
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lookupListOffset = ttUSHORT(data+8);
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lookupList = data + lookupListOffset;
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lookupCount = ttUSHORT(lookupList);
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stbtt_uint16 lookupCount = ttUSHORT(lookupList);
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for (stbtt_int32 i=0; i<lookupCount; ++i) {
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for (i=0; i<lookupCount; ++i) {
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stbtt_uint16 lookupOffset = ttUSHORT(lookupList + 2 + 2 * i);
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stbtt_uint8 *lookupTable = lookupList + lookupOffset;
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@ -2424,7 +2435,8 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
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stbtt_uint8 *subTableOffsets = lookupTable + 6;
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switch(lookupType) {
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case 2: { // Pair Adjustment Positioning Subtable
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for (stbtt_int32 sti=0; sti<subTableCount; sti++) {
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stbtt_int32 sti;
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for (sti=0; sti<subTableCount; sti++) {
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stbtt_uint16 subtableOffset = ttUSHORT(subTableOffsets + 2 * sti);
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stbtt_uint8 *table = lookupTable + subtableOffset;
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stbtt_uint16 posFormat = ttUSHORT(table);
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@ -2434,30 +2446,35 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
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switch (posFormat) {
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case 1: {
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stbtt_int32 l, r, m;
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int straw, needle;
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stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
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stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
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stbtt_int32 valueRecordPairSizeInBytes = 2;
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stbtt_uint16 pairSetCount = ttUSHORT(table + 8);
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stbtt_uint16 pairPosOffset = ttUSHORT(table + 10 + 2 * coverageIndex);
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stbtt_uint8 *pairValueTable = table + pairPosOffset;
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stbtt_uint16 pairValueCount = ttUSHORT(pairValueTable);
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stbtt_uint8 *pairValueArray = pairValueTable + 2;
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// TODO: Support more formats.
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STBTT_GPOS_TODO_assert(valueFormat1 == 4);
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if (valueFormat1 != 4) return 0;
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STBTT_GPOS_TODO_assert(valueFormat2 == 0);
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if (valueFormat2 != 0) return 0;
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stbtt_int32 valueRecordPairSizeInBytes = 2;
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stbtt_uint16 pairSetCount = ttUSHORT(table + 8);
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STBTT_assert(coverageIndex < pairSetCount);
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stbtt_uint16 pairPosOffset = ttUSHORT(table + 10 + 2 * coverageIndex);
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stbtt_uint8 *pairValueTable = table + pairPosOffset;
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stbtt_uint16 pairValueCount = ttUSHORT(pairValueTable);
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stbtt_uint8 *pairValueArray = pairValueTable + 2;
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needle=glyph2;
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r=pairValueCount-1;
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l=0;
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// Binary search.
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stbtt_int32 l=0, r=pairValueCount-1, m;
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int straw, needle=glyph2;
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while (l <= r) {
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stbtt_uint16 secondGlyph;
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stbtt_uint8 *pairValue;
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m = (l + r) >> 1;
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stbtt_uint8 *pairValue = pairValueArray + (2 + valueRecordPairSizeInBytes) * m;
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stbtt_uint16 secondGlyph = ttUSHORT(pairValue);
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pairValue = pairValueArray + (2 + valueRecordPairSizeInBytes) * m;
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secondGlyph = ttUSHORT(pairValue);
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straw = secondGlyph;
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if (needle < straw)
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r = m - 1;
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@ -2473,11 +2490,6 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
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case 2: {
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stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
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stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
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// TODO: Support more formats.
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STBTT_GPOS_TODO_assert(valueFormat1 == 4);
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if (valueFormat1 != 4) return 0;
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STBTT_GPOS_TODO_assert(valueFormat2 == 0);
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if (valueFormat2 != 0) return 0;
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stbtt_uint16 classDef1Offset = ttUSHORT(table + 8);
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stbtt_uint16 classDef2Offset = ttUSHORT(table + 10);
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@ -2489,6 +2501,12 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
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STBTT_assert(glyph1class < class1Count);
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STBTT_assert(glyph2class < class2Count);
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// TODO: Support more formats.
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STBTT_GPOS_TODO_assert(valueFormat1 == 4);
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if (valueFormat1 != 4) return 0;
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STBTT_GPOS_TODO_assert(valueFormat2 == 0);
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if (valueFormat2 != 0) return 0;
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if (glyph1class >= 0 && glyph1class < class1Count && glyph2class >= 0 && glyph2class < class2Count) {
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stbtt_uint8 *class1Records = table + 16;
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stbtt_uint8 *class2Records = class1Records + 2 * (glyph1class * class2Count);
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@ -2499,15 +2517,17 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
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default: {
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// There are no other cases.
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STBTT_assert(false);
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} break;
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STBTT_assert(0);
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break;
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};
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}
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}
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} break;
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break;
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};
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default: {
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default:
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// TODO: Implement other stuff.
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} break;
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break;
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}
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}
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@ -4735,6 +4755,9 @@ STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const
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// FULL VERSION HISTORY
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//
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// 1.19 (2018-02-11) OpenType GPOS kerning (horizontal only), STBTT_fmod
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// 1.18 (2018-01-29) add missing function
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// 1.17 (2017-07-23) make more arguments const; doc fix
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// 1.16 (2017-07-12) SDF support
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// 1.15 (2017-03-03) make more arguments const
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// 1.14 (2017-01-16) num-fonts-in-TTC function
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