void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const
{
#if PLATFORM(CHROMIUM)
if (preferHarfBuzz(this)) {
GlyphBuffer glyphBuffer;
HarfBuzzShaper shaper(this, run);
shaper.setDrawRange(from, to);
if (shaper.shape(&glyphBuffer)) {
drawGlyphBuffer(context, run, glyphBuffer, point);
return;
}
}
#endif
// This glyph buffer holds our glyphs + advances + font data for each glyph.
GlyphBuffer glyphBuffer;
float startX = point.x() + getGlyphsAndAdvancesForComplexText(run, from, to, glyphBuffer);
// We couldn't generate any glyphs for the run. Give up.
if (glyphBuffer.isEmpty())
return;
// Draw the glyph buffer now at the starting point returned in startX.
FloatPoint startPoint(startX, point.y());
drawGlyphBuffer(context, run, glyphBuffer, startPoint);
}
int Font::offsetForPositionForComplexText(const TextRun& run, float x, bool includePartialGlyphs) const
{
if (preferHarfBuzz(this)) {
HarfBuzzShaper shaper(this, run);
if (shaper.shape())
return shaper.offsetForPosition(x);
}
ComplexTextController controller(this, run);
return controller.offsetForPosition(x, includePartialGlyphs);
}
float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
{
if (preferHarfBuzz(this)) {
HarfBuzzShaper shaper(this, run);
if (shaper.shape())
return shaper.totalWidth();
}
ComplexTextController controller(this, run, true, fallbackFonts);
if (glyphOverflow) {
glyphOverflow->top = max<int>(glyphOverflow->top, ceilf(-controller.minGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().ascent()));
glyphOverflow->bottom = max<int>(glyphOverflow->bottom, ceilf(controller.maxGlyphBoundingBoxY()) - (glyphOverflow->computeBounds ? 0 : fontMetrics().descent()));
glyphOverflow->left = max<int>(0, ceilf(-controller.minGlyphBoundingBoxX()));
glyphOverflow->right = max<int>(0, ceilf(controller.maxGlyphBoundingBoxX() - controller.totalWidth()));
}
return controller.totalWidth();
}
FloatRect Font::selectionRectForComplexText(const TextRun& run, const FloatPoint& point, int h,
int from, int to) const
{
if (preferHarfBuzz(this)) {
HarfBuzzShaper shaper(this, run);
if (shaper.shape())
return shaper.selectionRect(point, h, from, to);
}
ComplexTextController controller(this, run);
controller.advance(from);
float beforeWidth = controller.runWidthSoFar();
controller.advance(to);
float afterWidth = controller.runWidthSoFar();
// Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning
if (run.rtl()) {
float totalWidth = controller.totalWidth();
return FloatRect(floorf(point.x() + totalWidth - afterWidth), point.y(), roundf(point.x() + totalWidth - beforeWidth) - floorf(point.x() + totalWidth - afterWidth), h);
}
return FloatRect(floorf(point.x() + beforeWidth), point.y(), roundf(point.x() + afterWidth) - floorf(point.x() + beforeWidth), h);
}