void SVGTextLayoutAttributesBuilder::collectTextPositioningElements(RenderBoxModelObject& start, bool& lastCharacterWasSpace)
{
ASSERT(!is<RenderSVGText>(start) || m_textPositions.isEmpty());
for (RenderObject* child = start.firstChild(); child; child = child->nextSibling()) {
if (is<RenderSVGInlineText>(*child)) {
processRenderSVGInlineText(downcast<RenderSVGInlineText>(*child), m_textLength, lastCharacterWasSpace);
continue;
}
if (!is<RenderSVGInline>(*child))
continue;
RenderSVGInline& inlineChild = downcast<RenderSVGInline>(*child);
SVGTextPositioningElement* element = SVGTextPositioningElement::elementFromRenderer(inlineChild);
unsigned atPosition = m_textPositions.size();
if (element)
m_textPositions.append(TextPosition(element, m_textLength));
collectTextPositioningElements(inlineChild, lastCharacterWasSpace);
if (!element)
continue;
// Update text position, after we're back from recursion.
TextPosition& position = m_textPositions[atPosition];
ASSERT(!position.length);
position.length = m_textLength - position.start;
}
}
void SVGTextLayoutAttributesBuilder::collectTextPositioningElements(RenderObject* start, bool& lastCharacterWasSpace)
{
ASSERT(!start->isSVGText() || m_textPositions.isEmpty());
for (RenderObject* child = start->firstChildSlow(); child; child = child->nextSibling()) {
if (child->isSVGInlineText()) {
processRenderSVGInlineText(*toRenderSVGInlineText(child), m_textLength, lastCharacterWasSpace);
continue;
}
if (!child->isSVGInline())
continue;
SVGTextPositioningElement* element = SVGTextPositioningElement::elementFromRenderer(child);
unsigned atPosition = m_textPositions.size();
if (element)
m_textPositions.append(TextPosition(element, m_textLength));
collectTextPositioningElements(child, lastCharacterWasSpace);
if (!element)
continue;
// Update text position, after we're back from recursion.
TextPosition& position = m_textPositions[atPosition];
ASSERT(!position.length);
position.length = m_textLength - position.start;
}
}
bool SVGTextLayoutAttributesBuilder::buildLayoutAttributesForForSubtree(RenderSVGText& textRoot)
{
m_characterDataMap.clear();
if (m_textPositions.isEmpty()) {
m_textLength = 0;
bool lastCharacterWasSpace = true;
collectTextPositioningElements(textRoot, lastCharacterWasSpace);
}
if (!m_textLength)
return false;
buildCharacterDataMap(textRoot);
m_metricsBuilder.buildMetricsAndLayoutAttributes(textRoot, nullptr, m_characterDataMap);
return true;
}
void SVGTextLayoutAttributesBuilder::buildLayoutAttributesForTextRenderer(RenderSVGInlineText& text)
{
auto* textRoot = RenderSVGText::locateRenderSVGTextAncestor(text);
if (!textRoot)
return;
if (m_textPositions.isEmpty()) {
m_characterDataMap.clear();
m_textLength = 0;
bool lastCharacterWasSpace = true;
collectTextPositioningElements(*textRoot, lastCharacterWasSpace);
if (!m_textLength)
return;
buildCharacterDataMap(*textRoot);
}
m_metricsBuilder.buildMetricsAndLayoutAttributes(*textRoot, &text, m_characterDataMap);
}
void SVGTextLayoutAttributesBuilder::buildLayoutAttributesForTextSubtree(RenderSVGText* textRoot)
{
ASSERT(textRoot);
// We always clear our current attribute as we don't want to keep any stale ones that could survive DOM modification.
Vector<SVGTextLayoutAttributes>& allAttributes = textRoot->layoutAttributes();
allAttributes.clear();
// Build list of x/y/dx/dy/rotate values for each subtree element that may define these values (tspan/textPath etc).
unsigned atCharacter = 0;
UChar lastCharacter = '\0';
collectTextPositioningElements(textRoot, atCharacter, lastCharacter);
if (!atCharacter)
return;
// Collect x/y/dx/dy/rotate values for each character, stored in the m_positioningLists.xValues()/etc. lists.
buildLayoutAttributesForAllCharacters(textRoot, atCharacter);
// Propagate layout attributes to each RenderSVGInlineText object, and the whole list to the RenderSVGText root.
atCharacter = 0;
lastCharacter = '\0';
propagateLayoutAttributes(textRoot, allAttributes, atCharacter, lastCharacter);
}
