void LayoutSVGText::subtreeChildWillBeRemoved(LayoutObject* child, Vector<SVGTextLayoutAttributes*, 2>& affectedAttributes)
{
ASSERT(child);
if (!shouldHandleSubtreeMutations())
return;
checkLayoutAttributesConsistency(this, m_layoutAttributes);
// The positioning elements cache depends on the size of each text layoutObject in the
// subtree. If this changes, clear the cache. It's going to be rebuilt below.
m_layoutAttributesBuilder.clearTextPositioningElements();
if (m_layoutAttributes.isEmpty() || !child->isSVGInlineText())
return;
// This logic requires that the 'text' child is still inserted in the tree.
LayoutSVGInlineText* text = toLayoutSVGInlineText(child);
SVGTextLayoutAttributes* previous = nullptr;
SVGTextLayoutAttributes* next = nullptr;
if (!documentBeingDestroyed())
findPreviousAndNextAttributes(this, text, previous, next);
if (previous)
affectedAttributes.append(previous);
if (next)
affectedAttributes.append(next);
size_t position = m_layoutAttributes.find(text->layoutAttributes());
ASSERT(position != kNotFound);
m_layoutAttributes.remove(position);
}
static inline bool findPreviousAndNextAttributes(LayoutSVGText* root, LayoutSVGInlineText* locateElement, SVGTextLayoutAttributes*& previous, SVGTextLayoutAttributes*& next)
{
ASSERT(root);
ASSERT(locateElement);
bool stopAfterNext = false;
LayoutObject* current = root->firstChild();
while (current) {
if (current->isSVGInlineText()) {
LayoutSVGInlineText* text = toLayoutSVGInlineText(current);
if (locateElement != text) {
if (stopAfterNext) {
next = text->layoutAttributes();
return true;
}
previous = text->layoutAttributes();
} else {
stopAfterNext = true;
}
} else if (current->isSVGInline()) {
// Descend into text content (if possible).
if (LayoutObject* child = toLayoutSVGInline(current)->firstChild()) {
current = child;
continue;
}
}
current = current->nextInPreOrderAfterChildren(root);
}
return false;
}
// Execute a query in "logical" order starting at |queryRoot|. This means
// walking the lines boxes for each layout object in layout tree (pre)order.
static void logicalQuery(LayoutObject* queryRoot, QueryData* queryData, ProcessTextFragmentCallback fragmentCallback)
{
if (!queryRoot)
return;
// Walk the layout tree in pre-order, starting at the specified root, and
// run the query for each text node.
Vector<SVGInlineTextBox*> textBoxes;
for (LayoutObject* layoutObject = queryRoot->slowFirstChild(); layoutObject; layoutObject = layoutObject->nextInPreOrder(queryRoot)) {
if (!layoutObject->isSVGInlineText())
continue;
LayoutSVGInlineText& textLayoutObject = toLayoutSVGInlineText(*layoutObject);
ASSERT(textLayoutObject.style());
// TODO(fs): Allow filtering the search earlier, since we should be
// able to trivially reject (prune) at least some of the queries.
collectTextBoxesInLogicalOrder(textLayoutObject, textBoxes);
for (const SVGInlineTextBox* textBox : textBoxes) {
if (queryTextBox(queryData, textBox, fragmentCallback))
return;
queryData->currentOffset += textBox->len();
}
}
}
static inline void collectLayoutAttributes(LayoutObject* text, Vector<SVGTextLayoutAttributes*>& attributes)
{
for (LayoutObject* descendant = text; descendant; descendant = descendant->nextInPreOrder(text)) {
if (descendant->isSVGInlineText())
attributes.append(toLayoutSVGInlineText(descendant)->layoutAttributes());
}
}
void SVGInlineTextBoxPainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
ASSERT(paintInfo.shouldPaintWithinRoot(&m_svgInlineTextBox.layoutObject()));
ASSERT(paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection);
ASSERT(m_svgInlineTextBox.truncation() == cNoTruncation);
if (m_svgInlineTextBox.layoutObject().style()->visibility() != VISIBLE)
return;
// We're explicitly not supporting composition & custom underlines and custom highlighters -- unlike InlineTextBox.
// If we ever need that for SVG, it's very easy to refactor and reuse the code.
if (paintInfo.phase == PaintPhaseSelection && !shouldPaintSelection())
return;
LayoutSVGInlineText& textLayoutObject = toLayoutSVGInlineText(m_svgInlineTextBox.layoutObject());
if (!textShouldBePainted(textLayoutObject))
return;
DisplayItem::Type displayItemType = DisplayItem::paintPhaseToDrawingType(paintInfo.phase);
if (!DrawingRecorder::useCachedDrawingIfPossible(*paintInfo.context, m_svgInlineTextBox, displayItemType)) {
LayoutObject& parentLayoutObject = m_svgInlineTextBox.parent()->layoutObject();
const ComputedStyle& style = parentLayoutObject.styleRef();
DrawingRecorder recorder(*paintInfo.context, m_svgInlineTextBox, displayItemType, paintInfo.rect);
InlineTextBoxPainter(m_svgInlineTextBox).paintDocumentMarkers(
paintInfo.context, paintOffset, style,
textLayoutObject.scaledFont(), true);
if (!m_svgInlineTextBox.textFragments().isEmpty())
paintTextFragments(paintInfo, parentLayoutObject);
}
}
static inline void writeSVGInlineTextBox(TextStream& ts, SVGInlineTextBox* textBox, int indent)
{
Vector<SVGTextFragment>& fragments = textBox->textFragments();
if (fragments.isEmpty())
return;
LayoutSVGInlineText& textLayoutObject = toLayoutSVGInlineText(textBox->layoutObject());
const SVGComputedStyle& svgStyle = textLayoutObject.style()->svgStyle();
String text = textBox->layoutObject().text();
unsigned fragmentsSize = fragments.size();
for (unsigned i = 0; i < fragmentsSize; ++i) {
SVGTextFragment& fragment = fragments.at(i);
writeIndent(ts, indent + 1);
unsigned startOffset = fragment.characterOffset;
unsigned endOffset = fragment.characterOffset + fragment.length;
// FIXME: Remove this hack, once the new text layout engine is completly landed. We want to preserve the old layout test results for now.
ts << "chunk 1 ";
ETextAnchor anchor = svgStyle.textAnchor();
bool isVerticalText = svgStyle.isVerticalWritingMode();
if (anchor == TA_MIDDLE) {
ts << "(middle anchor";
if (isVerticalText)
ts << ", vertical";
ts << ") ";
} else if (anchor == TA_END) {
ts << "(end anchor";
if (isVerticalText)
ts << ", vertical";
ts << ") ";
} else if (isVerticalText) {
ts << "(vertical) ";
}
startOffset -= textBox->start();
endOffset -= textBox->start();
// </hack>
ts << "text run " << i + 1 << " at (" << fragment.x << "," << fragment.y << ")";
ts << " startOffset " << startOffset << " endOffset " << endOffset;
if (isVerticalText)
ts << " height " << fragment.height;
else
ts << " width " << fragment.width;
if (!textBox->isLeftToRightDirection() || textBox->dirOverride()) {
ts << (textBox->isLeftToRightDirection() ? " LTR" : " RTL");
if (textBox->dirOverride())
ts << " override";
}
ts << ": " << quoteAndEscapeNonPrintables(text.substring(fragment.characterOffset, fragment.length)) << "\n";
}
}
static inline void updateFontInAllDescendants(LayoutObject* start, SVGTextLayoutAttributesBuilder* builder = nullptr)
{
for (LayoutObject* descendant = start; descendant; descendant = descendant->nextInPreOrder(start)) {
if (!descendant->isSVGInlineText())
continue;
LayoutSVGInlineText* text = toLayoutSVGInlineText(descendant);
text->updateScaledFont();
if (builder)
builder->rebuildMetricsForTextLayoutObject(text);
}
}
static bool queryTextBox(QueryData* queryData, const SVGInlineTextBox* textBox, ProcessTextFragmentCallback fragmentCallback)
{
queryData->textBox = textBox;
queryData->textLayoutObject = &toLayoutSVGInlineText(textBox->layoutObject());
queryData->isVerticalText = textBox->layoutObject().style()->svgStyle().isVerticalWritingMode();
// Loop over all text fragments in this text box, firing a callback for each.
for (const SVGTextFragment& fragment : textBox->textFragments()) {
if (fragmentCallback(queryData, fragment))
return true;
}
return false;
}
void LayoutSVGText::subtreeStyleDidChange()
{
if (!shouldHandleSubtreeMutations() || documentBeingDestroyed())
return;
checkLayoutAttributesConsistency(this, m_layoutAttributes);
// Only update the metrics cache, but not the text positioning element cache
// nor the layout attributes cached in the leaf #text layoutObjects.
FontCachePurgePreventer fontCachePurgePreventer;
for (LayoutObject* descendant = firstChild(); descendant; descendant = descendant->nextInPreOrder(this)) {
if (descendant->isSVGInlineText())
m_layoutAttributesBuilder.rebuildMetricsForTextLayoutObject(toLayoutSVGInlineText(descendant));
}
}
void SVGInlineTextBoxPainter::paintTextMatchMarker(GraphicsContext* context, const LayoutPoint&, DocumentMarker* marker, const ComputedStyle& style, const Font& font)
{
// SVG is only interested in the TextMatch markers.
if (marker->type() != DocumentMarker::TextMatch)
return;
LayoutSVGInlineText& textLayoutObject = toLayoutSVGInlineText(m_svgInlineTextBox.layoutObject());
AffineTransform fragmentTransform;
for (InlineTextBox* box = textLayoutObject.firstTextBox(); box; box = box->nextTextBox()) {
if (!box->isSVGInlineTextBox())
continue;
SVGInlineTextBox* textBox = toSVGInlineTextBox(box);
int markerStartPosition = std::max<int>(marker->startOffset() - textBox->start(), 0);
int markerEndPosition = std::min<int>(marker->endOffset() - textBox->start(), textBox->len());
if (markerStartPosition >= markerEndPosition)
continue;
const Vector<SVGTextFragment>& fragments = textBox->textFragments();
unsigned textFragmentsSize = fragments.size();
for (unsigned i = 0; i < textFragmentsSize; ++i) {
const SVGTextFragment& fragment = fragments.at(i);
int fragmentStartPosition = markerStartPosition;
int fragmentEndPosition = markerEndPosition;
if (!textBox->mapStartEndPositionsIntoFragmentCoordinates(fragment, fragmentStartPosition, fragmentEndPosition))
continue;
FloatRect fragmentRect = textBox->selectionRectForTextFragment(fragment, fragmentStartPosition, fragmentEndPosition, style);
fragment.buildFragmentTransform(fragmentTransform);
// Draw the marker highlight.
if (m_svgInlineTextBox.layoutObject().frame()->editor().markedTextMatchesAreHighlighted()) {
Color color = marker->activeMatch() ?
LayoutTheme::theme().platformActiveTextSearchHighlightColor() :
LayoutTheme::theme().platformInactiveTextSearchHighlightColor();
GraphicsContextStateSaver stateSaver(*context);
if (!fragmentTransform.isIdentity())
context->concatCTM(fragmentTransform);
context->setFillColor(color);
context->fillRect(fragmentRect, color);
}
}
}
}
void SVGInlineTextBoxPainter::paintSelectionBackground(const PaintInfo& paintInfo)
{
if (m_svgInlineTextBox.layoutObject().style()->visibility() != VISIBLE)
return;
ASSERT(!m_svgInlineTextBox.layoutObject().document().printing());
if (paintInfo.phase == PaintPhaseSelection || !shouldPaintSelection())
return;
Color backgroundColor = m_svgInlineTextBox.layoutObject().selectionBackgroundColor();
if (!backgroundColor.alpha())
return;
LayoutSVGInlineText& textLayoutObject = toLayoutSVGInlineText(m_svgInlineTextBox.layoutObject());
if (!textShouldBePainted(textLayoutObject))
return;
const ComputedStyle& style = m_svgInlineTextBox.parent()->layoutObject().styleRef();
int startPosition, endPosition;
m_svgInlineTextBox.selectionStartEnd(startPosition, endPosition);
int fragmentStartPosition = 0;
int fragmentEndPosition = 0;
AffineTransform fragmentTransform;
unsigned textFragmentsSize = m_svgInlineTextBox.textFragments().size();
for (unsigned i = 0; i < textFragmentsSize; ++i) {
SVGTextFragment& fragment = m_svgInlineTextBox.textFragments().at(i);
fragmentStartPosition = startPosition;
fragmentEndPosition = endPosition;
if (!m_svgInlineTextBox.mapStartEndPositionsIntoFragmentCoordinates(fragment, fragmentStartPosition, fragmentEndPosition))
continue;
GraphicsContextStateSaver stateSaver(*paintInfo.context);
fragment.buildFragmentTransform(fragmentTransform);
if (!fragmentTransform.isIdentity())
paintInfo.context->concatCTM(fragmentTransform);
paintInfo.context->setFillColor(backgroundColor);
paintInfo.context->fillRect(m_svgInlineTextBox.selectionRectForTextFragment(fragment, fragmentStartPosition, fragmentEndPosition, style), backgroundColor);
}
}
static void walkTree(LayoutSVGText* start, LayoutSVGInlineText* stopAtLeaf, MeasureTextData* data)
{
LayoutObject* child = start->firstChild();
while (child) {
if (child->isSVGInlineText()) {
LayoutSVGInlineText* text = toLayoutSVGInlineText(child);
measureTextLayoutObject(text, data, !stopAtLeaf || stopAtLeaf == text);
if (stopAtLeaf && stopAtLeaf == text)
return;
} else if (child->isSVGInline()) {
// Visit children of text content elements.
if (LayoutObject* inlineChild = toLayoutSVGInline(child)->firstChild()) {
child = inlineChild;
continue;
}
}
child = child->nextInPreOrderAfterChildren(start);
}
}
int CharacterNumberAtPositionData::characterNumberWithin(const LayoutObject* queryRoot) const
{
// http://www.w3.org/TR/SVG/single-page.html#text-__svg__SVGTextContentElement__getCharNumAtPosition
// "If no such character exists, a value of -1 is returned."
if (!hitLayoutObject)
return -1;
ASSERT(queryRoot);
int characterNumber = offsetInTextNode;
// Accumulate the lengths of all the text nodes preceding the target layout
// object within the queried root, to get the complete character number.
for (const LayoutObject* layoutObject = hitLayoutObject->previousInPreOrder(queryRoot);
layoutObject; layoutObject = layoutObject->previousInPreOrder(queryRoot)) {
if (!layoutObject->isSVGInlineText())
continue;
characterNumber += toLayoutSVGInlineText(layoutObject)->resolvedTextLength();
}
return characterNumber;
}
int SVGInlineTextBox::offsetForPositionInFragment(const SVGTextFragment& fragment, FloatWillBeLayoutUnit position, bool includePartialGlyphs) const
{
LayoutSVGInlineText& textLayoutObject = toLayoutSVGInlineText(this->layoutObject());
float scalingFactor = textLayoutObject.scalingFactor();
ASSERT(scalingFactor);
const ComputedStyle& style = textLayoutObject.styleRef();
TextRun textRun = constructTextRun(style, fragment);
// Eventually handle lengthAdjust="spacingAndGlyphs".
// FIXME: Handle vertical text.
AffineTransform fragmentTransform;
fragment.buildFragmentTransform(fragmentTransform);
if (!fragmentTransform.isIdentity())
textRun.setHorizontalGlyphStretch(narrowPrecisionToFloat(fragmentTransform.xScale()));
return fragment.characterOffset - start() + textLayoutObject.scaledFont().offsetForPosition(textRun, position * scalingFactor, includePartialGlyphs);
}
void SVGTextLayoutEngine::layoutInlineTextBox(SVGInlineTextBox* textBox)
{
ASSERT(textBox);
LayoutSVGInlineText& text = toLayoutSVGInlineText(textBox->layoutObject());
ASSERT(text.parent());
ASSERT(text.parent()->node());
ASSERT(text.parent()->node()->isSVGElement());
const ComputedStyle& style = text.styleRef();
textBox->clearTextFragments();
m_isVerticalText = style.svgStyle().isVerticalWritingMode();
layoutTextOnLineOrPath(textBox, text, style);
if (m_inPathLayout)
return;
m_lineLayoutBoxes.append(textBox);
}
void LayoutSVGText::subtreeTextDidChange(LayoutSVGInlineText* text)
{
ASSERT(text);
ASSERT(!beingDestroyed());
if (!everHadLayout()) {
ASSERT(m_layoutAttributes.isEmpty());
ASSERT(!m_layoutAttributesBuilder.numberOfTextPositioningElements());
return;
}
// Always protect the cache before clearing text positioning elements when the cache will subsequently be rebuilt.
FontCachePurgePreventer fontCachePurgePreventer;
// The positioning elements cache depends on the size of each text layoutObject in the
// subtree. If this changes, clear the cache. It's going to be rebuilt below.
m_layoutAttributesBuilder.clearTextPositioningElements();
for (LayoutObject* descendant = text; descendant; descendant = descendant->nextInPreOrder(text)) {
if (descendant->isSVGInlineText())
m_layoutAttributesBuilder.buildLayoutAttributesForText(toLayoutSVGInlineText(descendant));
}
}
FloatRect SVGInlineTextBox::selectionRectForTextFragment(const SVGTextFragment& fragment, int startPosition, int endPosition, const ComputedStyle& style)
{
ASSERT(startPosition < endPosition);
LayoutSVGInlineText& textLayoutObject = toLayoutSVGInlineText(this->layoutObject());
float scalingFactor = textLayoutObject.scalingFactor();
ASSERT(scalingFactor);
const Font& scaledFont = textLayoutObject.scaledFont();
const FontMetrics& scaledFontMetrics = scaledFont.fontMetrics();
FloatPoint textOrigin(fragment.x, fragment.y);
if (scalingFactor != 1)
textOrigin.scale(scalingFactor, scalingFactor);
textOrigin.move(0, -scaledFontMetrics.floatAscent());
FloatRect selectionRect = scaledFont.selectionRectForText(constructTextRun(style, fragment), textOrigin, fragment.height * scalingFactor, startPosition, endPosition);
if (scalingFactor == 1)
return selectionRect;
selectionRect.scale(1 / scalingFactor);
return selectionRect;
}
FloatRectWillBeLayoutRect SVGInlineTextBox::calculateBoundaries() const
{
FloatRectWillBeLayoutRect textRect;
LayoutSVGInlineText& textLayoutObject = toLayoutSVGInlineText(this->layoutObject());
float scalingFactor = textLayoutObject.scalingFactor();
ASSERT(scalingFactor);
FloatWillBeLayoutUnit baseline = textLayoutObject.scaledFont().fontMetrics().floatAscent() / scalingFactor;
AffineTransform fragmentTransform;
unsigned textFragmentsSize = m_textFragments.size();
for (unsigned i = 0; i < textFragmentsSize; ++i) {
const SVGTextFragment& fragment = m_textFragments.at(i);
FloatRectWillBeLayoutRect fragmentRect(fragment.x, fragment.y - baseline, fragment.width, fragment.height);
fragment.buildFragmentTransform(fragmentTransform);
fragmentRect = fragmentTransform.mapRect(fragmentRect.toFloatRect());
textRect.unite(fragmentRect);
}
return textRect;
}
bool SVGLayoutSupport::isLayoutableTextNode(const LayoutObject* object)
{
ASSERT(object->isText());
// <br> is marked as text, but is not handled by the SVG layout code-path.
return object->isSVGInlineText() && !toLayoutSVGInlineText(object)->hasEmptyText();
}
void SVGInlineTextBoxPainter::paintTextWithShadows(const PaintInfo& paintInfo, const ComputedStyle& style,
TextRun& textRun, const SVGTextFragment& fragment, int startPosition, int endPosition,
LayoutSVGResourceMode resourceMode)
{
LayoutSVGInlineText& textLayoutObject = toLayoutSVGInlineText(m_svgInlineTextBox.layoutObject());
float scalingFactor = textLayoutObject.scalingFactor();
ASSERT(scalingFactor);
const Font& scaledFont = textLayoutObject.scaledFont();
const ShadowList* shadowList = style.textShadow();
GraphicsContext* context = paintInfo.context;
// Text shadows are disabled when printing. http://crbug.com/258321
bool hasShadow = shadowList && !context->printing();
FloatPoint textOrigin(fragment.x, fragment.y);
FloatSize textSize(fragment.width, fragment.height);
AffineTransform paintServerTransform;
const AffineTransform* additionalPaintServerTransform = 0;
GraphicsContextStateSaver stateSaver(*context, false);
if (scalingFactor != 1) {
textOrigin.scale(scalingFactor, scalingFactor);
textSize.scale(scalingFactor);
stateSaver.save();
context->scale(1 / scalingFactor, 1 / scalingFactor);
// Adjust the paint-server coordinate space.
paintServerTransform.scale(scalingFactor);
additionalPaintServerTransform = &paintServerTransform;
}
SkPaint paint;
if (!SVGPaintContext::paintForLayoutObject(paintInfo, style, m_svgInlineTextBox.parent()->layoutObject(), resourceMode, paint, additionalPaintServerTransform))
return;
paint.setAntiAlias(true);
if (hasShadow) {
OwnPtr<DrawLooperBuilder> drawLooperBuilder = shadowList->createDrawLooper(DrawLooperBuilder::ShadowRespectsAlpha, style.visitedDependentColor(CSSPropertyColor));
RefPtr<SkDrawLooper> drawLooper = drawLooperBuilder->detachDrawLooper();
paint.setLooper(drawLooper.get());
}
if (resourceMode == ApplyToStrokeMode) {
StrokeData strokeData;
SVGLayoutSupport::applyStrokeStyleToStrokeData(strokeData, style, m_svgInlineTextBox.parent()->layoutObject());
if (style.svgStyle().vectorEffect() != VE_NON_SCALING_STROKE)
strokeData.setThickness(strokeData.thickness() * scalingFactor);
strokeData.setupPaint(&paint);
}
TextRunPaintInfo textRunPaintInfo(textRun);
textRunPaintInfo.from = startPosition;
textRunPaintInfo.to = endPosition;
float baseline = scaledFont.fontMetrics().floatAscent();
textRunPaintInfo.bounds = FloatRect(textOrigin.x(), textOrigin.y() - baseline,
textSize.width(), textSize.height());
context->drawText(scaledFont, textRunPaintInfo, textOrigin, paint);
}
