static inline void calculateGlyphBoundaries(const QueryData* queryData, const SVGTextFragment& fragment, int startPosition, FloatRect& extent)
{
float scalingFactor = queryData->textLayoutObject->scalingFactor();
ASSERT(scalingFactor);
FloatPoint glyphPosition = calculateGlyphPositionWithoutTransform(queryData, fragment, startPosition);
glyphPosition.move(0, -queryData->textLayoutObject->scaledFont().fontMetrics().floatAscent() / scalingFactor);
extent.setLocation(glyphPosition);
// Use the SVGTextMetrics computed by SVGTextMetricsBuilder (which spends
// time attempting to compute more correct glyph bounds already, handling
// cursive scripts to some degree.)
const Vector<SVGTextMetrics>& textMetricsValues = queryData->textLayoutObject->layoutAttributes()->textMetricsValues();
const SVGTextMetrics& metrics = findMetricsForCharacter(textMetricsValues, fragment, startPosition);
// TODO(fs): Negative glyph extents seems kind of weird to have, but
// presently it can occur in some cases (like Arabic.)
FloatSize glyphSize(std::max<float>(metrics.width(), 0), std::max<float>(metrics.height(), 0));
extent.setSize(glyphSize);
// If RTL, adjust the starting point to align with the LHS of the glyph bounding box.
if (!queryData->textBox->isLeftToRightDirection()) {
if (queryData->isVerticalText)
extent.move(0, -glyphSize.height());
else
extent.move(-glyphSize.width(), 0);
}
AffineTransform fragmentTransform;
fragment.buildFragmentTransform(fragmentTransform, SVGTextFragment::TransformIgnoringTextLength);
extent = fragmentTransform.mapRect(extent);
}
static FloatPoint calculateGlyphPosition(const QueryData* queryData, const SVGTextFragment& fragment, int offsetInFragment)
{
FloatPoint glyphPosition = calculateGlyphPositionWithoutTransform(queryData, fragment, offsetInFragment);
if (fragment.isTransformed()) {
AffineTransform fragmentTransform = fragment.buildFragmentTransform(SVGTextFragment::TransformIgnoringTextLength);
glyphPosition = fragmentTransform.mapPoint(glyphPosition);
}
return glyphPosition;
}
