static inline void removeFromCacheAndInvalidateDependencies(RenderElement& renderer, bool needsLayout)
{
if (auto* resources = SVGResourcesCache::cachedResourcesForRenderer(renderer)) {
if (RenderSVGResourceFilter* filter = resources->filter())
filter->removeClientFromCache(renderer);
if (RenderSVGResourceMasker* masker = resources->masker())
masker->removeClientFromCache(renderer);
if (RenderSVGResourceClipper* clipper = resources->clipper())
clipper->removeClientFromCache(renderer);
}
if (!renderer.element() || !renderer.element()->isSVGElement())
return;
HashSet<SVGElement*>* dependencies = renderer.document().accessSVGExtensions().setOfElementsReferencingTarget(downcast<SVGElement>(renderer.element()));
if (!dependencies)
return;
// We allow cycles in SVGDocumentExtensions reference sets in order to avoid expensive
// reference graph adjustments on changes, so we need to break possible cycles here.
static NeverDestroyed<HashSet<SVGElement*>> invalidatingDependencies;
for (auto* element : *dependencies) {
if (auto* renderer = element->renderer()) {
if (UNLIKELY(!invalidatingDependencies.get().add(element).isNewEntry)) {
// Reference cycle: we are in process of invalidating this dependant.
continue;
}
RenderSVGResource::markForLayoutAndParentResourceInvalidation(*renderer, needsLayout);
invalidatingDependencies.get().remove(element);
}
}
}
void SVGRenderSupport::applyStrokeStyleToContext(GraphicsContext* context, const RenderStyle& style, const RenderElement& renderer)
{
ASSERT(context);
ASSERT(renderer.element());
ASSERT(renderer.element()->isSVGElement());
const SVGRenderStyle& svgStyle = style.svgStyle();
SVGLengthContext lengthContext(toSVGElement(renderer.element()));
context->setStrokeThickness(svgStyle.strokeWidth().value(lengthContext));
context->setLineCap(svgStyle.capStyle());
context->setLineJoin(svgStyle.joinStyle());
if (svgStyle.joinStyle() == MiterJoin)
context->setMiterLimit(svgStyle.strokeMiterLimit());
const Vector<SVGLength>& dashes = svgStyle.strokeDashArray();
if (dashes.isEmpty())
context->setStrokeStyle(SolidStroke);
else {
DashArray dashArray;
dashArray.reserveInitialCapacity(dashes.size());
for (unsigned i = 0, size = dashes.size(); i < size; ++i)
dashArray.uncheckedAppend(dashes[i].value(lengthContext));
context->setLineDash(dashArray, svgStyle.strokeDashOffset().value(lengthContext));
}
}
static bool shouldCreateRenderer(const Element& element, const RenderElement& parentRenderer)
{
if (!parentRenderer.canHaveChildren() && !(element.isPseudoElement() && parentRenderer.canHaveGeneratedChildren()))
return false;
if (parentRenderer.element() && !parentRenderer.element()->childShouldCreateRenderer(element))
return false;
return true;
}
void SVGRenderSupport::styleChanged(RenderElement& renderer, const RenderStyle* oldStyle)
{
auto parent = renderer.parent();
SVGRenderSupport::setRendererHasSVGShadow(renderer, (parent && SVGRenderSupport::rendererHasSVGShadow(*parent)) || renderer.style().svgStyle().shadow());
#if ENABLE(CSS_COMPOSITING)
if (renderer.element() && renderer.element()->isSVGElement() && (!oldStyle || renderer.style().hasBlendMode() != oldStyle->hasBlendMode()))
SVGRenderSupport::updateMaskedAncestorShouldIsolateBlending(renderer);
#else
UNUSED_PARAM(oldStyle);
#endif
}
bool AnimationControllerPrivate::clear(RenderElement& renderer)
{
LOG(Animations, "AnimationControllerPrivate %p clear: %p", this, &renderer);
ASSERT(renderer.isCSSAnimating());
ASSERT(m_compositeAnimations.contains(&renderer));
Element* element = renderer.element();
m_eventsToDispatch.removeAllMatching([element] (const EventToDispatch& info) {
return info.element == element;
});
m_elementChangesToDispatch.removeAllMatching([element](auto& currentElement) {
return currentElement.ptr() == element;
});
// Return false if we didn't do anything OR we are suspended (so we don't try to
// do a setNeedsStyleRecalc() when suspended).
RefPtr<CompositeAnimation> animation = m_compositeAnimations.take(&renderer);
ASSERT(animation);
renderer.setIsCSSAnimating(false);
animation->clearRenderer();
return animation->isSuspended();
}
bool AnimationController::updateAnimations(RenderElement& renderer, const RenderStyle& newStyle, std::unique_ptr<RenderStyle>& animatedStyle)
{
auto* oldStyle = renderer.hasInitializedStyle() ? &renderer.style() : nullptr;
if ((!oldStyle || (!oldStyle->animations() && !oldStyle->transitions())) && (!newStyle.animations() && !newStyle.transitions()))
return false;
if (renderer.document().pageCacheState() != Document::NotInPageCache)
return false;
// Don't run transitions when printing.
if (renderer.view().printing())
return false;
// Fetch our current set of implicit animations from a hashtable. We then compare them
// against the animations in the style and make sure we're in sync. If destination values
// have changed, we reset the animation. We then do a blend to get new values and we return
// a new style.
// We don't support anonymous pseudo elements like :first-line or :first-letter.
ASSERT(renderer.element());
CompositeAnimation& rendererAnimations = m_data->ensureCompositeAnimation(renderer);
bool animationStateChanged = rendererAnimations.animate(renderer, oldStyle, newStyle, animatedStyle);
if (renderer.parent() || newStyle.animations() || (oldStyle && oldStyle->animations())) {
m_data->updateAnimationTimerForRenderer(renderer);
#if ENABLE(REQUEST_ANIMATION_FRAME)
renderer.view().frameView().scheduleAnimation();
#endif
}
return animationStateChanged;
}
void SVGRenderSupport::updateMaskedAncestorShouldIsolateBlending(const RenderElement& renderer)
{
ASSERT(renderer.element());
ASSERT(renderer.element()->isSVGElement());
bool maskedAncestorShouldIsolateBlending = renderer.style().hasBlendMode();
for (auto* ancestor = renderer.element()->parentElement(); ancestor && ancestor->isSVGElement(); ancestor = ancestor->parentElement()) {
if (!toSVGElement(ancestor)->isSVGGraphicsElement() || !isolatesBlending(*ancestor->computedStyle()))
continue;
if (ancestor->computedStyle()->svgStyle().hasMasker())
toSVGGraphicsElement(ancestor)->setShouldIsolateBlending(maskedAncestorShouldIsolateBlending);
return;
}
}
static bool planCounter(RenderElement& renderer, const AtomicString& identifier, bool& isReset, int& value)
{
// We must have a generating node or else we cannot have a counter.
Element* generatingElement = renderer.generatingElement();
if (!generatingElement)
return false;
const RenderStyle& style = renderer.style();
switch (style.styleType()) {
case NOPSEUDO:
// Sometimes elements have more then one renderer. Only the first one gets the counter
// LayoutTests/http/tests/css/counter-crash.html
if (generatingElement->renderer() != &renderer)
return false;
break;
case BEFORE:
case AFTER:
break;
default:
return false; // Counters are forbidden from all other pseudo elements.
}
const CounterDirectives directives = style.getCounterDirectives(identifier);
if (directives.isDefined()) {
value = directives.combinedValue();
isReset = directives.isReset();
return true;
}
if (identifier == "list-item") {
if (is<RenderListItem>(renderer)) {
if (downcast<RenderListItem>(renderer).hasExplicitValue()) {
value = downcast<RenderListItem>(renderer).explicitValue();
isReset = true;
return true;
}
value = 1;
isReset = false;
return true;
}
if (Element* element = renderer.element()) {
if (is<HTMLOListElement>(*element)) {
value = downcast<HTMLOListElement>(*element).start();
isReset = true;
return true;
}
if (element->hasTagName(ulTag) || element->hasTagName(menuTag) || element->hasTagName(dirTag)) {
value = 0;
isReset = true;
return true;
}
}
}
return false;
}
std::unique_ptr<RenderStyle> RenderNamedFlowFragment::computeStyleInRegion(RenderElement& renderer, const RenderStyle& parentStyle) const
{
ASSERT(!renderer.isAnonymous());
// FIXME: Region styling fails for pseudo-elements because the renderers don't have a node.
auto renderObjectRegionStyle = renderer.element()->styleResolver().styleForElement(*renderer.element(), &parentStyle, MatchAllRules, this).renderStyle;
return renderObjectRegionStyle;
}
void AnimationController::cancelAnimations(RenderElement& renderer)
{
if (!renderer.isCSSAnimating())
return;
if (!m_data->clear(renderer))
return;
Element* element = renderer.element();
ASSERT(!element || !element->document().inPageCache());
if (element)
element->setNeedsStyleRecalc(SyntheticStyleChange);
}
void SVGResourcesCache::clientStyleChanged(RenderElement& renderer, StyleDifference diff, const RenderStyle& newStyle)
{
if (diff == StyleDifferenceEqual || !renderer.parent())
return;
// In this case the proper SVGFE*Element will decide whether the modified CSS properties require a relayout or repaint.
if (renderer.isSVGResourceFilterPrimitive() && (diff == StyleDifferenceRepaint || diff == StyleDifferenceRepaintIfTextOrBorderOrOutline))
return;
// Dynamic changes of CSS properties like 'clip-path' may require us to recompute the associated resources for a renderer.
// FIXME: Avoid passing in a useless StyleDifference, but instead compare oldStyle/newStyle to see which resources changed
// to be able to selectively rebuild individual resources, instead of all of them.
if (rendererCanHaveResources(renderer)) {
SVGResourcesCache* cache = resourcesCacheFromRenderObject(renderer);
cache->removeResourcesFromRenderer(renderer);
cache->addResourcesFromRenderer(renderer, newStyle);
}
RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, false);
if (renderer.element() && !renderer.element()->isSVGElement())
renderer.element()->setNeedsStyleRecalc(SyntheticStyleChange);
}
void AnimationController::cancelAnimations(RenderElement& renderer)
{
if (!renderer.isCSSAnimating())
return;
if (!m_data->clear(renderer))
return;
Element* element = renderer.element();
if (!element || element->document().renderTreeBeingDestroyed())
return;
ASSERT(element->document().pageCacheState() == Document::NotInPageCache);
element->invalidateStyleAndLayerComposition();
}
void RenderNamedFlowThread::addFlowChild(RenderElement& newChild)
{
// The child list is used to sort the flow thread's children render objects
// based on their corresponding nodes DOM order. The list is needed to avoid searching the whole DOM.
if (newChild.isAnonymous())
return;
auto* beforeChild = nextRendererForElement(*newChild.element());
if (beforeChild)
m_flowThreadChildList.insertBefore(beforeChild, &newChild);
else
m_flowThreadChildList.add(&newChild);
}
void FEImage::platformApplySoftware()
{
RenderElement* renderer = referencedRenderer();
if (!m_image && !renderer)
return;
ImageBuffer* resultImage = createImageBufferResult();
if (!resultImage)
return;
SVGFilter* svgFilter = toSVGFilter(filter());
FloatRect destRect = svgFilter->absoluteTransform().mapRect(filterPrimitiveSubregion());
FloatRect srcRect;
if (renderer)
srcRect = svgFilter->absoluteTransform().mapRect(renderer->repaintRectInLocalCoordinates());
else {
srcRect = FloatRect(FloatPoint(), m_image->size());
m_preserveAspectRatio.transformRect(destRect, srcRect);
}
IntPoint paintLocation = absolutePaintRect().location();
destRect.move(-paintLocation.x(), -paintLocation.y());
// FEImage results are always in ColorSpaceDeviceRGB
setResultColorSpace(ColorSpaceDeviceRGB);
if (renderer) {
const AffineTransform& absoluteTransform = svgFilter->absoluteTransform();
resultImage->context()->concatCTM(absoluteTransform);
SVGElement* contextNode = toSVGElement(renderer->element());
if (contextNode->hasRelativeLengths()) {
SVGLengthContext lengthContext(contextNode);
FloatSize viewportSize;
// If we're referencing an element with percentage units, eg. <rect with="30%"> those values were resolved against the viewport.
// Build up a transformation that maps from the viewport space to the filter primitive subregion.
if (lengthContext.determineViewport(viewportSize))
resultImage->context()->concatCTM(makeMapBetweenRects(FloatRect(FloatPoint(), viewportSize), destRect));
}
AffineTransform contentTransformation;
SVGRenderingContext::renderSubtreeToImageBuffer(resultImage, *renderer, contentTransformation);
return;
}
resultImage->context()->drawImage(m_image.get(), ColorSpaceDeviceRGB, destRect, srcRect);
}
void RenderCounter::rendererSubtreeAttached(RenderElement& renderer)
{
if (!renderer.view().hasRenderCounters())
return;
Element* element = renderer.element();
if (element && !element->isPseudoElement())
element = element->parentElement();
else
element = renderer.generatingElement();
if (element && !element->renderer())
return; // No need to update if the parent is not attached yet
for (RenderObject* descendant = &renderer; descendant; descendant = descendant->nextInPreOrder(&renderer)) {
if (is<RenderElement>(*descendant))
updateCounters(downcast<RenderElement>(*descendant));
}
}
PassRef<RenderStyle> AnimationController::updateAnimations(RenderElement& renderer, PassRef<RenderStyle> newStyle)
{
// Don't do anything if we're in the cache
if (renderer.document().inPageCache())
return newStyle;
RenderStyle* oldStyle = renderer.hasInitializedStyle() ? &renderer.style() : nullptr;
if ((!oldStyle || (!oldStyle->animations() && !oldStyle->transitions())) && (!newStyle.get().animations() && !newStyle.get().transitions()))
return newStyle;
// Don't run transitions when printing.
if (renderer.view().printing())
return newStyle;
// Fetch our current set of implicit animations from a hashtable. We then compare them
// against the animations in the style and make sure we're in sync. If destination values
// have changed, we reset the animation. We then do a blend to get new values and we return
// a new style.
// We don't support anonymous pseudo elements like :first-line or :first-letter.
ASSERT(renderer.element());
Ref<RenderStyle> newStyleBeforeAnimation(std::move(newStyle));
CompositeAnimation& rendererAnimations = m_data->ensureCompositeAnimation(&renderer);
auto blendedStyle = rendererAnimations.animate(renderer, oldStyle, newStyleBeforeAnimation.get());
if (renderer.parent() || newStyleBeforeAnimation->animations() || (oldStyle && oldStyle->animations())) {
m_data->updateAnimationTimerForRenderer(&renderer);
#if ENABLE(REQUEST_ANIMATION_FRAME)
renderer.view().frameView().scheduleAnimation();
#endif
}
if (&blendedStyle.get() != &newStyleBeforeAnimation.get()) {
// If the animations/transitions change opacity or transform, we need to update
// the style to impose the stacking rules. Note that this is also
// done in StyleResolver::adjustRenderStyle().
if (blendedStyle.get().hasAutoZIndex() && (blendedStyle.get().opacity() < 1.0f || blendedStyle.get().hasTransform()))
blendedStyle.get().setZIndex(0);
}
return blendedStyle;
}
void SVGRenderingContext::prepareToRenderSVGContent(RenderElement& renderer, PaintInfo& paintInfo, NeedsGraphicsContextSave needsGraphicsContextSave)
{
#ifndef NDEBUG
// This function must not be called twice!
ASSERT(!(m_renderingFlags & PrepareToRenderSVGContentWasCalled));
m_renderingFlags |= PrepareToRenderSVGContentWasCalled;
#endif
m_renderer = &renderer;
m_paintInfo = &paintInfo;
m_filter = 0;
// We need to save / restore the context even if the initialization failed.
if (needsGraphicsContextSave == SaveGraphicsContext) {
m_paintInfo->context().save();
m_renderingFlags |= RestoreGraphicsContext;
}
auto& style = m_renderer->style();
const SVGRenderStyle& svgStyle = style.svgStyle();
// Setup transparency layers before setting up SVG resources!
bool isRenderingMask = isRenderingMaskImage(*m_renderer);
// RenderLayer takes care of root opacity.
float opacity = (renderer.isSVGRoot() || isRenderingMask) ? 1 : style.opacity();
const ShadowData* shadow = svgStyle.shadow();
bool hasBlendMode = style.hasBlendMode();
bool hasIsolation = style.hasIsolation();
bool isolateMaskForBlending = false;
#if ENABLE(CSS_COMPOSITING)
if (svgStyle.hasMasker() && is<SVGGraphicsElement>(downcast<SVGElement>(*renderer.element()))) {
SVGGraphicsElement& graphicsElement = downcast<SVGGraphicsElement>(*renderer.element());
isolateMaskForBlending = graphicsElement.shouldIsolateBlending();
}
#endif
if (opacity < 1 || shadow || hasBlendMode || isolateMaskForBlending || hasIsolation) {
FloatRect repaintRect = m_renderer->repaintRectInLocalCoordinates();
m_paintInfo->context().clip(repaintRect);
if (opacity < 1 || hasBlendMode || isolateMaskForBlending || hasIsolation) {
if (hasBlendMode)
m_paintInfo->context().setCompositeOperation(m_paintInfo->context().compositeOperation(), style.blendMode());
m_paintInfo->context().beginTransparencyLayer(opacity);
if (hasBlendMode)
m_paintInfo->context().setCompositeOperation(m_paintInfo->context().compositeOperation(), BlendModeNormal);
m_renderingFlags |= EndOpacityLayer;
}
if (shadow) {
m_paintInfo->context().setShadow(IntSize(roundToInt(shadow->x()), roundToInt(shadow->y())), shadow->radius(), shadow->color());
m_paintInfo->context().beginTransparencyLayer(1);
m_renderingFlags |= EndShadowLayer;
}
}
ClipPathOperation* clipPathOperation = style.clipPath();
if (is<ShapeClipPathOperation>(clipPathOperation)) {
auto& clipPath = downcast<ShapeClipPathOperation>(*clipPathOperation);
FloatRect referenceBox;
if (clipPath.referenceBox() == Stroke)
// FIXME: strokeBoundingBox() takes dasharray into account but shouldn't.
referenceBox = renderer.strokeBoundingBox();
else if (clipPath.referenceBox() == ViewBox && renderer.element()) {
FloatSize viewportSize;
SVGLengthContext(downcast<SVGElement>(renderer.element())).determineViewport(viewportSize);
referenceBox.setWidth(viewportSize.width());
referenceBox.setHeight(viewportSize.height());
} else
referenceBox = renderer.objectBoundingBox();
m_paintInfo->context().clipPath(clipPath.pathForReferenceRect(referenceBox), clipPath.windRule());
}
auto* resources = SVGResourcesCache::cachedResourcesForRenderer(*m_renderer);
if (!resources) {
if (style.hasReferenceFilterOnly())
return;
m_renderingFlags |= RenderingPrepared;
return;
}
if (!isRenderingMask) {
if (RenderSVGResourceMasker* masker = resources->masker()) {
GraphicsContext* contextPtr = &m_paintInfo->context();
bool result = masker->applyResource(*m_renderer, style, contextPtr, ApplyToDefaultMode);
m_paintInfo->setContext(*contextPtr);
if (!result)
return;
}
}
RenderSVGResourceClipper* clipper = resources->clipper();
if (!clipPathOperation && clipper) {
GraphicsContext* contextPtr = &m_paintInfo->context();
bool result = clipper->applyResource(*m_renderer, style, contextPtr, ApplyToDefaultMode);
m_paintInfo->setContext(*contextPtr);
if (!result)
return;
}
if (!isRenderingMask) {
m_filter = resources->filter();
if (m_filter) {
m_savedContext = &m_paintInfo->context();
m_savedPaintRect = m_paintInfo->rect;
// Return with false here may mean that we don't need to draw the content
// (because it was either drawn before or empty) but we still need to apply the filter.
m_renderingFlags |= EndFilterLayer;
GraphicsContext* contextPtr = &m_paintInfo->context();
bool result = m_filter->applyResource(*m_renderer, style, contextPtr, ApplyToDefaultMode);
m_paintInfo->setContext(*contextPtr);
if (!result)
return;
// Since we're caching the resulting bitmap and do not invalidate it on repaint rect
// changes, we need to paint the whole filter region. Otherwise, elements not visible
// at the time of the initial paint (due to scrolling, window size, etc.) will never
// be drawn.
m_paintInfo->rect = IntRect(m_filter->drawingRegion(m_renderer));
}
}
m_renderingFlags |= RenderingPrepared;
}
bool SVGResources::buildCachedResources(const RenderElement& renderer, const RenderStyle& style)
{
ASSERT(renderer.element());
ASSERT_WITH_SECURITY_IMPLICATION(renderer.element()->isSVGElement());
if (!renderer.element())
return false;
auto& element = downcast<SVGElement>(*renderer.element());
Document& document = element.document();
SVGDocumentExtensions& extensions = document.accessSVGExtensions();
const AtomicString& tagName = element.localName();
if (tagName.isNull())
return false;
const SVGRenderStyle& svgStyle = style.svgStyle();
bool foundResources = false;
if (clipperFilterMaskerTags().contains(tagName)) {
if (svgStyle.hasClipper()) {
AtomicString id(svgStyle.clipperResource());
if (setClipper(getRenderSVGResourceById<RenderSVGResourceClipper>(document, id)))
foundResources = true;
else
registerPendingResource(extensions, id, element);
}
if (style.hasFilter()) {
const FilterOperations& filterOperations = style.filter();
if (filterOperations.size() == 1) {
const FilterOperation& filterOperation = *filterOperations.at(0);
if (filterOperation.type() == FilterOperation::REFERENCE) {
const auto& referenceFilterOperation = downcast<ReferenceFilterOperation>(filterOperation);
AtomicString id = SVGURIReference::fragmentIdentifierFromIRIString(referenceFilterOperation.url(), element.document());
if (setFilter(getRenderSVGResourceById<RenderSVGResourceFilter>(document, id)))
foundResources = true;
else
registerPendingResource(extensions, id, element);
}
}
}
if (svgStyle.hasMasker()) {
AtomicString id(svgStyle.maskerResource());
if (setMasker(getRenderSVGResourceById<RenderSVGResourceMasker>(document, id)))
foundResources = true;
else
registerPendingResource(extensions, id, element);
}
}
if (markerTags().contains(tagName) && svgStyle.hasMarkers()) {
AtomicString markerStartId(svgStyle.markerStartResource());
if (setMarkerStart(getRenderSVGResourceById<RenderSVGResourceMarker>(document, markerStartId)))
foundResources = true;
else
registerPendingResource(extensions, markerStartId, element);
AtomicString markerMidId(svgStyle.markerMidResource());
if (setMarkerMid(getRenderSVGResourceById<RenderSVGResourceMarker>(document, markerMidId)))
foundResources = true;
else
registerPendingResource(extensions, markerMidId, element);
AtomicString markerEndId(svgStyle.markerEndResource());
if (setMarkerEnd(getRenderSVGResourceById<RenderSVGResourceMarker>(document, markerEndId)))
foundResources = true;
else
registerPendingResource(extensions, markerEndId, element);
}
if (fillAndStrokeTags().contains(tagName)) {
if (svgStyle.hasFill()) {
bool hasPendingResource = false;
AtomicString id;
if (setFill(paintingResourceFromSVGPaint(document, svgStyle.fillPaintType(), svgStyle.fillPaintUri(), id, hasPendingResource)))
foundResources = true;
else if (hasPendingResource)
registerPendingResource(extensions, id, element);
}
if (svgStyle.hasStroke()) {
bool hasPendingResource = false;
AtomicString id;
if (setStroke(paintingResourceFromSVGPaint(document, svgStyle.strokePaintType(), svgStyle.strokePaintUri(), id, hasPendingResource)))
foundResources = true;
else if (hasPendingResource)
registerPendingResource(extensions, id, element);
}
}
if (chainableResourceTags().contains(tagName)) {
AtomicString id(targetReferenceFromResource(element));
if (setLinkedResource(getRenderSVGResourceContainerById(document, id)))
foundResources = true;
else
registerPendingResource(extensions, id, element);
}
return foundResources;
}
bool SVGFontData::applySVGGlyphSelection(WidthIterator& iterator, GlyphData& glyphData, bool mirror, unsigned currentCharacter, unsigned& advanceLength) const
{
const TextRun& run = iterator.run();
Vector<SVGGlyph::ArabicForm>& arabicForms = iterator.arabicForms();
ASSERT(run.charactersLength() >= currentCharacter);
// Associate text with arabic forms, if needed.
String remainingTextInRun;
if (run.is8Bit()) {
remainingTextInRun = String(run.data8(currentCharacter), run.charactersLength() - currentCharacter);
remainingTextInRun = Font::normalizeSpaces(remainingTextInRun.characters8(), remainingTextInRun.length());
} else {
remainingTextInRun = String(run.data16(currentCharacter), run.charactersLength() - currentCharacter);
remainingTextInRun = Font::normalizeSpaces(remainingTextInRun.characters16(), remainingTextInRun.length());
}
if (mirror)
remainingTextInRun = createStringWithMirroredCharacters(remainingTextInRun);
if (!currentCharacter && arabicForms.isEmpty())
arabicForms = charactersWithArabicForm(remainingTextInRun, mirror);
SVGFontFaceElement* svgFontFaceElement = this->svgFontFaceElement();
ASSERT(svgFontFaceElement);
SVGFontElement* associatedFontElement = svgFontFaceElement->associatedFontElement();
ASSERT(associatedFontElement);
RenderObject* renderObject = 0;
if (TextRun::RenderingContext* renderingContext = run.renderingContext())
renderObject = &static_cast<SVGTextRunRenderingContext*>(renderingContext)->renderer();
String language;
bool isVerticalText = false;
Vector<String> altGlyphNames;
if (renderObject) {
RenderElement* parentRenderer = renderObject->isRenderElement() ? toRenderElement(renderObject) : renderObject->parent();
ASSERT(parentRenderer);
isVerticalText = parentRenderer->style().svgStyle().isVerticalWritingMode();
if (Element* parentRendererElement = parentRenderer->element()) {
language = parentRendererElement->getAttribute(XMLNames::langAttr);
if (isSVGAltGlyphElement(parentRendererElement)) {
SVGAltGlyphElement* altGlyph = toSVGAltGlyphElement(parentRendererElement);
if (!altGlyph->hasValidGlyphElements(altGlyphNames))
altGlyphNames.clear();
}
}
}
Vector<SVGGlyph> glyphs;
size_t altGlyphNamesSize = altGlyphNames.size();
if (altGlyphNamesSize) {
for (size_t index = 0; index < altGlyphNamesSize; ++index)
associatedFontElement->collectGlyphsForGlyphName(altGlyphNames[index], glyphs);
// Assign the unicodeStringLength now that its known.
size_t glyphsSize = glyphs.size();
for (size_t i = 0; i < glyphsSize; ++i)
glyphs[i].unicodeStringLength = run.length();
// Do not check alt glyphs for compatibility. Just return the first one.
// Later code will fail if we do not do this and the glyph is incompatible.
if (glyphsSize) {
SVGGlyph& svgGlyph = glyphs[0];
iterator.setLastGlyphName(svgGlyph.glyphName);
glyphData.glyph = svgGlyph.tableEntry;
advanceLength = svgGlyph.unicodeStringLength;
return true;
}
} else
associatedFontElement->collectGlyphsForString(remainingTextInRun, glyphs);
size_t glyphsSize = glyphs.size();
for (size_t i = 0; i < glyphsSize; ++i) {
SVGGlyph& svgGlyph = glyphs[i];
if (svgGlyph.isPartOfLigature)
continue;
if (!isCompatibleGlyph(svgGlyph, isVerticalText, language, arabicForms, currentCharacter, currentCharacter + svgGlyph.unicodeStringLength))
continue;
iterator.setLastGlyphName(svgGlyph.glyphName);
glyphData.glyph = svgGlyph.tableEntry;
advanceLength = svgGlyph.unicodeStringLength;
return true;
}
iterator.setLastGlyphName(String());
return false;
}
void SVGTextLayoutEngine::layoutTextOnLineOrPath(SVGInlineTextBox* textBox, RenderSVGInlineText* text, const RenderStyle* style)
{
if (m_inPathLayout && m_textPath.isEmpty())
return;
RenderElement* textParent = text->parent();
ASSERT(textParent);
SVGElement* lengthContext = downcast<SVGElement>(textParent->element());
bool definesTextLength = parentDefinesTextLength(textParent);
const SVGRenderStyle& svgStyle = style->svgStyle();
m_visualMetricsListOffset = 0;
m_visualCharacterOffset = 0;
Vector<SVGTextMetrics>& visualMetricsValues = text->layoutAttributes()->textMetricsValues();
ASSERT(!visualMetricsValues.isEmpty());
auto upconvertedCharacters = StringView(text->text()).upconvertedCharacters();
const UChar* characters = upconvertedCharacters;
const Font& font = style->font();
SVGTextLayoutEngineSpacing spacingLayout(font);
SVGTextLayoutEngineBaseline baselineLayout(font);
bool didStartTextFragment = false;
bool applySpacingToNextCharacter = false;
float lastAngle = 0;
float baselineShift = baselineLayout.calculateBaselineShift(&svgStyle, lengthContext);
baselineShift -= baselineLayout.calculateAlignmentBaselineShift(m_isVerticalText, text);
// Main layout algorithm.
while (true) {
// Find the start of the current text box in this list, respecting ligatures.
SVGTextMetrics visualMetrics(SVGTextMetrics::SkippedSpaceMetrics);
if (!currentVisualCharacterMetrics(textBox, visualMetricsValues, visualMetrics))
break;
if (visualMetrics.isEmpty()) {
advanceToNextVisualCharacter(visualMetrics);
continue;
}
SVGTextLayoutAttributes* logicalAttributes = 0;
if (!currentLogicalCharacterAttributes(logicalAttributes))
break;
ASSERT(logicalAttributes);
SVGTextMetrics logicalMetrics(SVGTextMetrics::SkippedSpaceMetrics);
if (!currentLogicalCharacterMetrics(logicalAttributes, logicalMetrics))
break;
SVGCharacterDataMap& characterDataMap = logicalAttributes->characterDataMap();
SVGCharacterData data;
SVGCharacterDataMap::iterator it = characterDataMap.find(m_logicalCharacterOffset + 1);
if (it != characterDataMap.end())
data = it->value;
float x = data.x;
float y = data.y;
// When we've advanced to the box start offset, determine using the original x/y values,
// whether this character starts a new text chunk, before doing any further processing.
if (m_visualCharacterOffset == textBox->start())
textBox->setStartsNewTextChunk(logicalAttributes->context().characterStartsNewTextChunk(m_logicalCharacterOffset));
float angle = data.rotate == SVGTextLayoutAttributes::emptyValue() ? 0 : data.rotate;
// Calculate glyph orientation angle.
const UChar* currentCharacter = characters + m_visualCharacterOffset;
float orientationAngle = baselineLayout.calculateGlyphOrientationAngle(m_isVerticalText, &svgStyle, *currentCharacter);
// Calculate glyph advance & x/y orientation shifts.
float xOrientationShift = 0;
float yOrientationShift = 0;
float glyphAdvance = baselineLayout.calculateGlyphAdvanceAndOrientation(m_isVerticalText, visualMetrics, orientationAngle, xOrientationShift, yOrientationShift);
// Assign current text position to x/y values, if needed.
updateCharacerPositionIfNeeded(x, y);
// Apply dx/dy value adjustments to current text position, if needed.
updateRelativePositionAdjustmentsIfNeeded(data.dx, data.dy);
// Calculate SVG Fonts kerning, if needed.
float kerning = spacingLayout.calculateSVGKerning(m_isVerticalText, visualMetrics.glyph());
// Calculate CSS 'kerning', 'letter-spacing' and 'word-spacing' for next character, if needed.
float spacing = spacingLayout.calculateCSSKerningAndSpacing(&svgStyle, lengthContext, currentCharacter);
float textPathOffset = 0;
if (m_inPathLayout) {
float scaledGlyphAdvance = glyphAdvance * m_textPathScaling;
if (m_isVerticalText) {
// If there's an absolute y position available, it marks the beginning of a new position along the path.
if (y != SVGTextLayoutAttributes::emptyValue())
m_textPathCurrentOffset = y + m_textPathStartOffset;
m_textPathCurrentOffset += m_dy - kerning;
m_dy = 0;
// Apply dx/dy correction and setup translations that move to the glyph midpoint.
xOrientationShift += m_dx + baselineShift;
yOrientationShift -= scaledGlyphAdvance / 2;
} else {
// If there's an absolute x position available, it marks the beginning of a new position along the path.
if (x != SVGTextLayoutAttributes::emptyValue())
m_textPathCurrentOffset = x + m_textPathStartOffset;
m_textPathCurrentOffset += m_dx - kerning;
m_dx = 0;
// Apply dx/dy correction and setup translations that move to the glyph midpoint.
xOrientationShift -= scaledGlyphAdvance / 2;
yOrientationShift += m_dy - baselineShift;
}
// Calculate current offset along path.
textPathOffset = m_textPathCurrentOffset + scaledGlyphAdvance / 2;
// Move to next character.
m_textPathCurrentOffset += scaledGlyphAdvance + m_textPathSpacing + spacing * m_textPathScaling;
// Skip character, if we're before the path.
if (textPathOffset < 0) {
advanceToNextLogicalCharacter(logicalMetrics);
advanceToNextVisualCharacter(visualMetrics);
continue;
}
// Stop processing, if the next character lies behind the path.
if (textPathOffset > m_textPathLength)
break;
bool ok = false;
FloatPoint point = m_textPath.pointAtLength(textPathOffset, ok);
ASSERT(ok);
x = point.x();
y = point.y();
angle = m_textPath.normalAngleAtLength(textPathOffset, ok);
ASSERT(ok);
// For vertical text on path, the actual angle has to be rotated 90 degrees anti-clockwise, not the orientation angle!
if (m_isVerticalText)
angle -= 90;
} else {
// Apply all previously calculated shift values.
if (m_isVerticalText) {
x += baselineShift;
y -= kerning;
} else {
x -= kerning;
y -= baselineShift;
}
x += m_dx;
y += m_dy;
}
// Determine whether we have to start a new fragment.
bool shouldStartNewFragment = m_dx || m_dy || m_isVerticalText || m_inPathLayout || angle || angle != lastAngle
|| orientationAngle || kerning || applySpacingToNextCharacter || definesTextLength;
// If we already started a fragment, close it now.
if (didStartTextFragment && shouldStartNewFragment) {
applySpacingToNextCharacter = false;
recordTextFragment(textBox, visualMetricsValues);
}
// Eventually start a new fragment, if not yet done.
if (!didStartTextFragment || shouldStartNewFragment) {
ASSERT(!m_currentTextFragment.characterOffset);
ASSERT(!m_currentTextFragment.length);
didStartTextFragment = true;
m_currentTextFragment.characterOffset = m_visualCharacterOffset;
m_currentTextFragment.metricsListOffset = m_visualMetricsListOffset;
m_currentTextFragment.x = x;
m_currentTextFragment.y = y;
// Build fragment transformation.
if (angle)
m_currentTextFragment.transform.rotate(angle);
if (xOrientationShift || yOrientationShift)
m_currentTextFragment.transform.translate(xOrientationShift, yOrientationShift);
if (orientationAngle)
m_currentTextFragment.transform.rotate(orientationAngle);
m_currentTextFragment.isTextOnPath = m_inPathLayout && m_textPathScaling != 1;
if (m_currentTextFragment.isTextOnPath) {
if (m_isVerticalText)
m_currentTextFragment.lengthAdjustTransform.scaleNonUniform(1, m_textPathScaling);
else
m_currentTextFragment.lengthAdjustTransform.scaleNonUniform(m_textPathScaling, 1);
}
}
// Update current text position, after processing of the current character finished.
if (m_inPathLayout)
updateCurrentTextPosition(x, y, glyphAdvance);
else {
// Apply CSS 'kerning', 'letter-spacing' and 'word-spacing' to next character, if needed.
if (spacing)
applySpacingToNextCharacter = true;
float xNew = x - m_dx;
float yNew = y - m_dy;
if (m_isVerticalText)
xNew -= baselineShift;
else
yNew += baselineShift;
updateCurrentTextPosition(xNew, yNew, glyphAdvance + spacing);
}
advanceToNextLogicalCharacter(logicalMetrics);
advanceToNextVisualCharacter(visualMetrics);
lastAngle = angle;
}
if (!didStartTextFragment)
return;
// Close last open fragment, if needed.
recordTextFragment(textBox, visualMetricsValues);
}
// One of the element types that can cause graphics to be drawn onto the target canvas. Specifically: circle, ellipse,
// image, line, path, polygon, polyline, rect, text and use.
static bool isGraphicsElement(const RenderElement& renderer)
{
return renderer.isSVGShape() || renderer.isSVGText() || renderer.isSVGImage() || renderer.element()->hasTagName(SVGNames::useTag);
}
PassRefPtr<RenderStyle> RenderNamedFlowFragment::computeStyleInRegion(RenderElement& renderer, RenderStyle& parentStyle)
{
ASSERT(!renderer.isAnonymous());
// FIXME: Region styling fails for pseudo-elements because the renderers don't have a node.
RefPtr<RenderStyle> renderObjectRegionStyle = renderer.view().document().ensureStyleResolver().styleForElement(renderer.element(), &parentStyle, DisallowStyleSharing, MatchAllRules, this);
return renderObjectRegionStyle.release();
}
