int
get_ot_math_ital_corr(int f, int g)
{
int rval = 0;
if (fontarea[f] == OTGR_FONT_FLAG) {
XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]);
const char* table = font->getMathTable();
if (table == NULL)
return rval;
uint16_t offset = SWAP(((const MathTableHeader*)table)->mathGlyphInfo);
if (offset == 0)
return rval;
const MathGlyphInfo* glyphInfo = (const MathGlyphInfo*)(table + offset);
offset = SWAP(glyphInfo->mathItalicsCorrectionInfo);
if (offset == 0)
return rval;
const MathItalicsCorrectionInfo* italCorrInfo = (const MathItalicsCorrectionInfo*)(((const char*)glyphInfo) + offset);
offset = SWAP(italCorrInfo->coverage);
if (offset == 0)
return rval;
const Coverage* coverage = (const Coverage*)(((const char*)italCorrInfo) + offset);
int32_t index = getCoverage(coverage, g);
if (index >= 0 && index < SWAP(italCorrInfo->italicsCorrectionCount))
rval = D2Fix(font->unitsToPoints(SWAP(italCorrInfo->italicsCorrection[index].value)));
}
return rval;
}
int
ot_part_full_advance(int f, const GlyphAssembly* a, int i)
{
int rval = 0;
if (fontarea[f] == OTGR_FONT_FLAG) {
XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]);
rval = D2Fix(font->unitsToPoints(SWAP(a->partRecords[i].fullAdvance)));
}
return rval;
}
int
get_ot_math_constant(int f, int n)
{
int rval = 0;
if (fontarea[f] == OTGR_FONT_FLAG) {
XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]);
rval = getMathConstant(font, (mathConstantIndex)n);
/* scale according to font size, except the ones that are percentages */
if (n > scriptScriptPercentScaleDown && n < radicalDegreeBottomRaisePercent)
rval = D2Fix(font->unitsToPoints(rval));
}
return rval;
}
int
get_ot_math_kern(int f, int g, int sf, int sg, int cmd, int shift)
{
int rval = 0;
if (fontarea[f] == OTGR_FONT_FLAG) {
XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]);
int kern = 0, skern = 0;
float corr_height_top = 0.0, corr_height_bot = 0.0;
shift = Fix2D(shift);
if (cmd == sup_cmd) { // superscript
corr_height_top = font->pointsToUnits(glyph_height(f, g));
corr_height_bot = -font->pointsToUnits(glyph_depth(sf, sg) + shift);
kern = getMathKernAt(f, g, topRight, corr_height_top);
skern = getMathKernAt(sf, sg, bottomLeft, corr_height_top);
rval = kern + skern;
kern = getMathKernAt(f, g, topRight, corr_height_bot);
skern = getMathKernAt(sf, sg, bottomLeft, corr_height_bot);
if ((kern + skern) < rval)
rval = kern + skern;
} else if (cmd == sub_cmd) { // subscript
corr_height_top = font->pointsToUnits(glyph_height(sf, sg) - shift);
corr_height_bot = -font->pointsToUnits(glyph_depth(f, g));
kern = getMathKernAt(f, g, bottomRight, corr_height_top);
skern = getMathKernAt(sf, sg, topLeft, corr_height_top);
rval = kern + skern;
kern = getMathKernAt(f, g, bottomRight, corr_height_bot);
skern = getMathKernAt(sf, sg, topLeft, corr_height_bot);
if ((kern + skern) < rval)
rval = kern + skern;
} else {
assert(0); // we should not reach here
}
rval = D2Fix(font->unitsToPoints(rval));
}
return rval;
}
int
ot_min_connector_overlap(int f)
{
int rval = 0;
if (fontarea[f] == OTGR_FONT_FLAG) {
XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]);
const char* table = font->getMathTable();
if (table == NULL)
return rval;
uint16_t offset = SWAP(((const MathTableHeader*)table)->mathVariants);
if (offset == 0)
return rval;
const MathVariants* variants = (const MathVariants*)(table + offset);
rval = D2Fix(font->unitsToPoints(SWAP(variants->minConnectorOverlap)));
}
return rval;
}
int
get_ot_math_variant(int f, int g, int v, integer* adv, int horiz)
{
int rval = g;
*adv = -1;
if (fontarea[f] == OTGR_FONT_FLAG) {
XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]);
const char* table = font->getMathTable();
if (table == NULL)
return rval;
uint16_t offset = SWAP(((const MathTableHeader*)table)->mathVariants);
if (offset == 0)
return rval;
const MathVariants* variants = (const MathVariants*)(table + offset);
offset = horiz ? SWAP(variants->horizGlyphCoverage) : SWAP(variants->vertGlyphCoverage);
if (offset == 0)
return rval;
const Coverage* coverage = (const Coverage*)(((const char*)variants) + offset);
int32_t index = getCoverage(coverage, g);
if (index >= 0) {
if (horiz)
index += SWAP(variants->vertGlyphCount);
const MathGlyphConstruction* construction = (const MathGlyphConstruction*)(((const char*)variants)
+ SWAP(variants->vertGlyphConstruction[index]));
if (v < SWAP(construction->variantCount)) {
rval = SWAP(construction->mathGlyphVariantRecord[v].variantGlyph);
*adv = D2Fix(font->unitsToPoints(SWAP(construction->mathGlyphVariantRecord[v].advanceMeasurement)));
}
}
}
return rval;
}
int
get_ot_math_accent_pos(int f, int g)
{
int rval = 0x7fffffffUL;
if (fontarea[f] == OTGR_FONT_FLAG) {
XeTeXFontInst* font = (XeTeXFontInst*)getFont((XeTeXLayoutEngine)fontlayoutengine[f]);
const char* table = font->getMathTable();
if (table == NULL)
return rval;
uint16_t offset = SWAP(((const MathTableHeader*)table)->mathGlyphInfo);
if (offset == 0)
return rval;
const MathGlyphInfo* glyphInfo = (const MathGlyphInfo*)(table + offset);
offset = SWAP(glyphInfo->mathTopAccentAttachment);
if (offset == 0)
return rval;
const MathTopAccentAttachment* accentAttachment = (const MathTopAccentAttachment*)(((const char*)glyphInfo) + offset);
offset = SWAP(accentAttachment->coverage);
if (offset == 0)
return rval;
const Coverage* coverage = (const Coverage*)(((const char*)accentAttachment) + offset);
int32_t index = getCoverage(coverage, g);
if (index >= 0 && index < SWAP(accentAttachment->topAccentAttachmentCount)) {
rval = (int16_t)SWAP(accentAttachment->topAccentAttachment[index].value);
rval = D2Fix(font->unitsToPoints(rval));
}
}
return rval;
}
Fixed
getSlant(XeTeXFont font)
{
float italAngle = ((XeTeXFontInst*)font)->getItalicAngle();
return D2Fix(tan(-italAngle * M_PI / 180.0));
}
