C++ (Cpp) nsCSSValue::GetLengthTwips Examples

Example #1

File: nsMathMLFrame.cpp Project: rn10950/RetroZilla

/* static */ nscoord
nsMathMLFrame::CalcLength(nsPresContext*   aPresContext,
                          nsStyleContext*   aStyleContext,
                          const nsCSSValue& aCSSValue)
{
  NS_ASSERTION(aCSSValue.IsLengthUnit(), "not a length unit");

  if (aCSSValue.IsFixedLengthUnit()) {
    return aCSSValue.GetLengthTwips();
  }

  nsCSSUnit unit = aCSSValue.GetUnit();

  if (eCSSUnit_Pixel == unit) {
    return NSFloatPixelsToTwips(aCSSValue.GetFloatValue(),
                                aPresContext->ScaledPixelsToTwips());
  }
  else if (eCSSUnit_EM == unit) {
    const nsStyleFont* font = aStyleContext->GetStyleFont();
    return NSToCoordRound(aCSSValue.GetFloatValue() * (float)font->mFont.size);
  }
  else if (eCSSUnit_XHeight == unit) {
    nscoord xHeight;
    const nsStyleFont* font = aStyleContext->GetStyleFont();
    nsCOMPtr<nsIFontMetrics> fm = aPresContext->GetMetricsFor(font->mFont);
    fm->GetXHeight(xHeight);
    return NSToCoordRound(aCSSValue.GetFloatValue() * (float)xHeight);
  }

  return 0;
}