Path RenderSVGTextPath::layoutPath() const
{
Element* targetElement = SVGURIReference::targetElementFromIRIString(textPathElement().href(), document());
if (!targetElement || !targetElement->hasTagName(SVGNames::pathTag))
return Path();
SVGPathElement* pathElement = toSVGPathElement(targetElement);
Path pathData;
updatePathFromGraphicsElement(pathElement, pathData);
// Spec: The transform attribute on the referenced 'path' element represents a
// supplemental transformation relative to the current user coordinate system for
// the current 'text' element, including any adjustments to the current user coordinate
// system due to a possible transform attribute on the current 'text' element.
// http://www.w3.org/TR/SVG/text.html#TextPathElement
pathData.transform(pathElement->animatedLocalTransform());
return pathData;
}
void SkSVGDevice::drawTextOnPath(const SkDraw&, const void* text, size_t len, const SkPath& path,
const SkMatrix* matrix, const SkPaint& paint) {
SkString pathID = fResourceBucket->addPath();
{
AutoElement defs("defs", fWriter);
AutoElement pathElement("path", fWriter);
pathElement.addAttribute("id", pathID);
pathElement.addPathAttributes(path);
}
{
AutoElement textElement("text", fWriter);
textElement.addTextAttributes(paint);
if (matrix && !matrix->isIdentity()) {
textElement.addAttribute("transform", svg_transform(*matrix));
}
{
AutoElement textPathElement("textPath", fWriter);
textPathElement.addAttribute("xlink:href", SkStringPrintf("#%s", pathID.c_str()));
if (paint.getTextAlign() != SkPaint::kLeft_Align) {
SkASSERT(paint.getTextAlign() == SkPaint::kCenter_Align ||
paint.getTextAlign() == SkPaint::kRight_Align);
textPathElement.addAttribute("startOffset",
paint.getTextAlign() == SkPaint::kCenter_Align ? "50%" : "100%");
}
SVGTextBuilder builder(text, len, paint, SkPoint::Make(0, 0), 0);
textPathElement.addText(builder.text());
}
}
}
bool RenderSVGTextPath::stretchMethod() const
{
return textPathElement().method() == SVGTextPathMethodStretch;
}
bool RenderSVGTextPath::exactAlignment() const
{
return textPathElement().spacing() == SVGTextPathSpacingExact;
}
float RenderSVGTextPath::startOffset() const
{
return textPathElement().startOffset().valueAsPercentage();
}
