float ITextService.MeasureBlankLineHeight(RequestFont font)
{
Typeface typeface = ResolveTypeface(font);
return((int)(Math.Round(typeface.CalculateMaxLineClipHeight() *
typeface.CalculateScaleToPixelFromPointSize(font.SizeInPoints))));
}
//
public void CalculateUserCharGlyphAdvancePos(ref TextBufferSpan textBufferSpan,
ILineSegmentList lineSegs,
RequestFont font,
int[] outputUserInputCharAdvance, out int outputTotalW, out int lineHeight)
{
//layout
//from font
//resolve for typeface
//
Typeface typeface = ResolveTypeface(font);
_txtServices.SetCurrentFont(typeface, font.SizeInPoints);
MyLineSegmentList mylineSegs = (MyLineSegmentList)lineSegs;
float scale = typeface.CalculateScaleToPixelFromPointSize(font.SizeInPoints);
outputTotalW = 0;
int j = mylineSegs.Count;
int pos = 0; //start at 0
_reusableTextBuffer.SetRawCharBuffer(textBufferSpan.GetRawCharBuffer());
for (int i = 0; i < j; ++i)
{
//get each segment
MyLineSegment lineSeg = (MyLineSegment)mylineSegs.GetSegment(i);
//each line seg may has different script lang
_txtServices.CurrentScriptLang = lineSeg.scriptLang;
//
//CACHING ...., reduce number of GSUB/GPOS
//
//we cache used line segment for a while
//we ask for caching context for a specific typeface and font size
#if DEBUG
if (lineSeg.Length > _reusableTextBuffer.Len)
{
}
#endif
GlyphPlanSequence seq = _txtServices.GetUnscaledGlyphPlanSequence(_reusableTextBuffer,
lineSeg.StartAt,
lineSeg.Length);
int seqLen = seq.Count;
for (int s = 0; s < seqLen; ++s)
{
UnscaledGlyphPlan glyphPlan = seq[s];
double actualAdvX = glyphPlan.AdvanceX;
outputTotalW +=
outputUserInputCharAdvance[pos + glyphPlan.input_cp_offset] +=
(int)Math.Round(actualAdvX * scale);
}
pos += lineSeg.Length;
}
//
lineHeight = (int)Math.Round(typeface.CalculateMaxLineClipHeight() * scale);
_reusableTextBuffer.SetRawCharBuffer(null);
}
