FloatRect strokeBoundingBox(const Path& path, RenderStyle* style, const RenderObject* object)
{
// the bbox might grow if the path is stroked.
// and CGPathGetBoundingBox doesn't support that, so we'll have
// to make an alternative call...
// FIXME: since this is mainly used to decide what to repaint,
// perhaps it would be sufficient to just outset the fill bbox by
// the stroke width - that should be way cheaper and simpler than
// what we do here.
CGPathRef cgPath = path.platformPath();
CGContextRef context = scratchContext();
CGContextSaveGState(context);
CGContextBeginPath(context);
CGContextAddPath(context, cgPath);
GraphicsContext gc(context);
applyStrokeStyleToContext(&gc, style, object);
CGContextReplacePathWithStrokedPath(context);
if (CGContextIsPathEmpty(context)) {
// CGContextReplacePathWithStrokedPath seems to fail to create a path sometimes, this is not well understood.
// returning here prevents CG from logging to the console from CGContextGetPathBoundingBox
CGContextRestoreGState(context);
return FloatRect();
}
CGRect box = CGContextGetPathBoundingBox(context);
CGContextRestoreGState(context);
return FloatRect(box);
}
FloatRect Path::strokeBoundingRect(StrokeStyleApplier* applier) const
{
CGContextRef context = scratchContext();
CGContextSaveGState(context);
CGContextBeginPath(context);
CGContextAddPath(context, platformPath());
if (applier) {
GraphicsContext graphicsContext(context);
applier->strokeStyle(&graphicsContext);
}
CGContextReplacePathWithStrokedPath(context);
CGRect box = CGContextIsPathEmpty(context) ? CGRectZero : CGContextGetPathBoundingBox(context);
CGContextRestoreGState(context);
return box;
}