size_t IFont::getStringWidth(const std::string & data) const
{
size_t width = 0;
for(size_t i=0; i<data.size(); i += getCharacterSize(data[i]))
{
width += getGlyphWidth(data.data() + i);
}
return width;
}
void
XeTeXFontInst::getGlyphSidebearings(GlyphID gid, float* lsb, float* rsb)
{
float width = getGlyphWidth(gid);
GlyphBBox bbox;
getGlyphBounds(gid, &bbox);
if (lsb)
*lsb = bbox.xMin;
if (rsb)
*rsb = width - bbox.xMax;
}
float
XeTeXFontInst::getGlyphItalCorr(GlyphID gid)
{
float rval = 0.0;
float width = getGlyphWidth(gid);
GlyphBBox bbox;
getGlyphBounds(gid, &bbox);
if (bbox.xMax > width)
rval = bbox.xMax - width;
return rval;
}
float getKerning (HDC dc, const int glyph1, const int glyph2)
{
KerningPair kp;
kp.glyph1 = glyph1;
kp.glyph2 = glyph2;
int index = kerningPairs.indexOf (kp);
if (index < 0)
{
kp.glyph2 = -1;
index = kerningPairs.indexOf (kp);
if (index < 0)
{
kp.glyph2 = -1;
kp.kerning = getGlyphWidth (dc, kp.glyph1) / (float) tm.tmHeight;
kerningPairs.add (kp);
return kp.kerning;
}
}
return kerningPairs.getReference (index).kerning;
}
void createKerningPairs (HDC dc, const float height)
{
HeapBlock<KERNINGPAIR> rawKerning;
const DWORD numKPs = GetKerningPairs (dc, 0, 0);
rawKerning.calloc (numKPs);
GetKerningPairs (dc, numKPs, rawKerning);
kerningPairs.ensureStorageAllocated ((int) numKPs);
for (DWORD i = 0; i < numKPs; ++i)
{
KerningPair kp;
kp.glyph1 = getGlyphForChar (dc, rawKerning[i].wFirst);
kp.glyph2 = getGlyphForChar (dc, rawKerning[i].wSecond);
const int standardWidth = getGlyphWidth (dc, kp.glyph1);
kp.kerning = (standardWidth + rawKerning[i].iKernAmount) / height;
kerningPairs.add (kp);
kp.glyph2 = -1; // add another entry for the standard width version..
kp.kerning = standardWidth / height;
kerningPairs.add (kp);
}
}
