/* * Copyright (C) 2003, 2006, 2008 Apple Inc. All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public License * along with this library; see the file COPYING.LIB. If not, write to * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * Boston, MA 02110-1301, USA. */ #include "sky/engine/core/rendering/RootInlineBox.h" #include "sky/engine/core/dom/Document.h" #include "sky/engine/core/dom/StyleEngine.h" #include "sky/engine/core/rendering/EllipsisBox.h" #include "sky/engine/core/rendering/HitTestResult.h" #include "sky/engine/core/rendering/InlineTextBox.h" #include "sky/engine/core/rendering/PaintInfo.h" #include "sky/engine/core/rendering/RenderParagraph.h" #include "sky/engine/core/rendering/RenderInline.h" #include "sky/engine/core/rendering/RenderView.h" #include "sky/engine/core/rendering/VerticalPositionCache.h" #include "sky/engine/platform/text/BidiResolver.h" #include "sky/engine/wtf/unicode/Unicode.h" namespace blink { struct SameSizeAsRootInlineBox : public InlineFlowBox { unsigned unsignedVariable; void* pointers[2]; LayoutUnit layoutVariables[5]; }; COMPILE_ASSERT(sizeof(RootInlineBox) == sizeof(SameSizeAsRootInlineBox), RootInlineBox_should_stay_small); typedef WTF::HashMap EllipsisBoxMap; static EllipsisBoxMap* gEllipsisBoxMap = 0; RootInlineBox::RootInlineBox(RenderParagraph& block) : InlineFlowBox(block) , m_lineBreakPos(0) , m_lineBreakObj(0) , m_lineTop(0) , m_lineBottom(0) , m_lineTopWithLeading(0) , m_lineBottomWithLeading(0) , m_selectionBottom(0) { } void RootInlineBox::destroy() { detachEllipsisBox(); InlineFlowBox::destroy(); } void RootInlineBox::detachEllipsisBox() { if (hasEllipsisBox()) { EllipsisBox* box = gEllipsisBoxMap->take(this); box->setParent(0); box->destroy(); setHasEllipsisBox(false); } } RenderLineBoxList* RootInlineBox::rendererLineBoxes() const { return block().lineBoxes(); } void RootInlineBox::clearTruncation() { if (hasEllipsisBox()) { detachEllipsisBox(); InlineFlowBox::clearTruncation(); } } int RootInlineBox::baselinePosition(FontBaseline baselineType) const { return boxModelObject()->baselinePosition(baselineType, isFirstLineStyle(), HorizontalLine, PositionOfInteriorLineBoxes); } LayoutUnit RootInlineBox::lineHeight() const { return boxModelObject()->lineHeight(isFirstLineStyle(), HorizontalLine, PositionOfInteriorLineBoxes); } bool RootInlineBox::lineCanAccommodateEllipsis(bool ltr, int blockEdge, int lineBoxEdge, int ellipsisWidth) { // First sanity-check the unoverflowed width of the whole line to see if there is sufficient room. int delta = ltr ? lineBoxEdge - blockEdge : blockEdge - lineBoxEdge; if (logicalWidth() - delta < ellipsisWidth) return false; // Next iterate over all the line boxes on the line. If we find a replaced element that intersects // then we refuse to accommodate the ellipsis. Otherwise we're ok. return InlineFlowBox::canAccommodateEllipsis(ltr, blockEdge, ellipsisWidth); } float RootInlineBox::placeEllipsis(const AtomicString& ellipsisStr, bool ltr, float blockLeftEdge, float blockRightEdge, float ellipsisWidth, InlineBox* markupBox) { // Create an ellipsis box. EllipsisBox* ellipsisBox = new EllipsisBox(renderer(), ellipsisStr, this, ellipsisWidth - (markupBox ? markupBox->logicalWidth() : 0), logicalHeight(), x(), y(), !prevRootBox(), markupBox); if (!gEllipsisBoxMap) gEllipsisBoxMap = new EllipsisBoxMap(); gEllipsisBoxMap->add(this, ellipsisBox); setHasEllipsisBox(true); // FIXME: Do we need an RTL version of this? if (ltr && (logicalLeft() + logicalWidth() + ellipsisWidth) <= blockRightEdge) { ellipsisBox->setLogicalLeft(logicalLeft() + logicalWidth()); return logicalWidth() + ellipsisWidth; } // Now attempt to find the nearest glyph horizontally and place just to the right (or left in RTL) // of that glyph. Mark all of the objects that intersect the ellipsis box as not painting (as being // truncated). bool foundBox = false; float truncatedWidth = 0; float position = placeEllipsisBox(ltr, blockLeftEdge, blockRightEdge, ellipsisWidth, truncatedWidth, foundBox); ellipsisBox->setLogicalLeft(position); return truncatedWidth; } float RootInlineBox::placeEllipsisBox(bool ltr, float blockLeftEdge, float blockRightEdge, float ellipsisWidth, float &truncatedWidth, bool& foundBox) { float result = InlineFlowBox::placeEllipsisBox(ltr, blockLeftEdge, blockRightEdge, ellipsisWidth, truncatedWidth, foundBox); if (result == -1) { result = ltr ? blockRightEdge - ellipsisWidth : blockLeftEdge; truncatedWidth = blockRightEdge - blockLeftEdge; } return result; } void RootInlineBox::paintEllipsisBox(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom, Vector& layers) const { if (hasEllipsisBox()) ellipsisBox()->paint(paintInfo, paintOffset, lineTop, lineBottom, layers); } void RootInlineBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom, Vector& layers) { InlineFlowBox::paint(paintInfo, paintOffset, lineTop, lineBottom, layers); paintEllipsisBox(paintInfo, paintOffset, lineTop, lineBottom, layers); } bool RootInlineBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom) { if (hasEllipsisBox() && visibleToHitTestRequest(request)) { if (ellipsisBox()->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, lineTop, lineBottom)) { renderer().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset)); return true; } } return InlineFlowBox::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, lineTop, lineBottom); } void RootInlineBox::adjustPosition(float dx, float dy) { InlineFlowBox::adjustPosition(dx, dy); LayoutUnit blockDirectionDelta = dy; // The block direction delta is a LayoutUnit. m_lineTop += blockDirectionDelta; m_lineBottom += blockDirectionDelta; m_lineTopWithLeading += blockDirectionDelta; m_lineBottomWithLeading += blockDirectionDelta; m_selectionBottom += blockDirectionDelta; if (hasEllipsisBox()) ellipsisBox()->adjustPosition(dx, dy); } void RootInlineBox::childRemoved(InlineBox* box) { if (&box->renderer() == m_lineBreakObj) setLineBreakInfo(0, 0, BidiStatus()); for (RootInlineBox* prev = prevRootBox(); prev && prev->lineBreakObj() == &box->renderer(); prev = prev->prevRootBox()) { prev->setLineBreakInfo(0, 0, BidiStatus()); prev->markDirty(); } } LayoutUnit RootInlineBox::alignBoxesInBlockDirection(LayoutUnit heightOfBlock, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache) { // SVG will handle vertical alignment on its own. if (isSVGRootInlineBox()) return 0; LayoutUnit maxPositionTop = 0; LayoutUnit maxPositionBottom = 0; int maxAscent = 0; int maxDescent = 0; bool setMaxAscent = false; bool setMaxDescent = false; m_baselineType = AlphabeticBaseline; computeLogicalBoxHeights(this, maxPositionTop, maxPositionBottom, maxAscent, maxDescent, setMaxAscent, setMaxDescent, true, textBoxDataMap, baselineType(), verticalPositionCache); if (maxAscent + maxDescent < std::max(maxPositionTop, maxPositionBottom)) adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom); LayoutUnit maxHeight = maxAscent + maxDescent; LayoutUnit lineTop = heightOfBlock; LayoutUnit lineBottom = heightOfBlock; LayoutUnit lineTopIncludingMargins = heightOfBlock; LayoutUnit lineBottomIncludingMargins = heightOfBlock; LayoutUnit selectionBottom = heightOfBlock; bool setLineTop = false; bool hasAnnotationsBefore = false; bool hasAnnotationsAfter = false; placeBoxesInBlockDirection(heightOfBlock, maxHeight, maxAscent, true, lineTop, lineBottom, selectionBottom, setLineTop, lineTopIncludingMargins, lineBottomIncludingMargins, hasAnnotationsBefore, hasAnnotationsAfter, baselineType()); m_hasAnnotationsBefore = hasAnnotationsBefore; m_hasAnnotationsAfter = hasAnnotationsAfter; maxHeight = std::max(0, maxHeight); // FIXME: Is this really necessary? setLineTopBottomPositions(lineTop, lineBottom, heightOfBlock, heightOfBlock + maxHeight, selectionBottom); LayoutUnit annotationsAdjustment = beforeAnnotationsAdjustment(); if (annotationsAdjustment) { // FIXME: Need to handle pagination here. We might have to move to the next page/column as a result of the // ruby expansion. adjustBlockDirectionPosition(annotationsAdjustment.toFloat()); heightOfBlock += annotationsAdjustment; } return heightOfBlock + maxHeight; } float RootInlineBox::maxLogicalTop() const { float maxLogicalTop = 0; computeMaxLogicalTop(maxLogicalTop); return maxLogicalTop; } LayoutUnit RootInlineBox::beforeAnnotationsAdjustment() const { LayoutUnit result = 0; // Annotations under the previous line may push us down. if (prevRootBox() && prevRootBox()->hasAnnotationsAfter()) result = prevRootBox()->computeUnderAnnotationAdjustment(lineTop()); if (!hasAnnotationsBefore()) return result; // Annotations over this line may push us further down. LayoutUnit highestAllowedPosition = prevRootBox() ? std::min(prevRootBox()->lineBottom(), lineTop()) + result : static_cast(block().borderBefore()); result = computeOverAnnotationAdjustment(highestAllowedPosition); return result; } GapRects RootInlineBox::lineSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock, LayoutUnit selTop, LayoutUnit selHeight, const PaintInfo* paintInfo) { RenderObject::SelectionState lineState = selectionState(); bool leftGap, rightGap; block().getSelectionGapInfo(lineState, leftGap, rightGap); GapRects result; InlineBox* firstBox = firstSelectedBox(); InlineBox* lastBox = lastSelectedBox(); if (leftGap) { result.uniteLeft(block().logicalLeftSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock, &firstBox->parent()->renderer(), firstBox->logicalLeft(), selTop, selHeight, paintInfo)); } if (rightGap) { result.uniteRight(block().logicalRightSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock, &lastBox->parent()->renderer(), lastBox->logicalRight(), selTop, selHeight, paintInfo)); } // When dealing with bidi text, a non-contiguous selection region is possible. // e.g. The logical text aaaAAAbbb (capitals denote RTL text and non-capitals LTR) is layed out // visually as 3 text runs |aaa|bbb|AAA| if we select 4 characters from the start of the text the // selection will look like (underline denotes selection): // |aaa|bbb|AAA| // ___ _ // We can see that the |bbb| run is not part of the selection while the runs around it are. if (firstBox && firstBox != lastBox) { // Now fill in any gaps on the line that occurred between two selected elements. LayoutUnit lastLogicalLeft = firstBox->logicalRight(); bool isPreviousBoxSelected = firstBox->selectionState() != RenderObject::SelectionNone; for (InlineBox* box = firstBox->nextLeafChild(); box; box = box->nextLeafChild()) { if (box->selectionState() != RenderObject::SelectionNone) { LayoutRect logicalRect(lastLogicalLeft, selTop, box->logicalLeft() - lastLogicalLeft, selHeight); logicalRect.move(offsetFromRootBlock); LayoutRect gapRect = rootBlock->logicalRectToPhysicalRect(rootBlockPhysicalPosition, logicalRect); if (isPreviousBoxSelected && gapRect.width() > 0 && gapRect.height() > 0) { if (paintInfo) paintInfo->context->fillRect(gapRect, box->parent()->renderer().selectionBackgroundColor()); // VisibleSelection may be non-contiguous, see comment above. result.uniteCenter(gapRect); } lastLogicalLeft = box->logicalRight(); } if (box == lastBox) break; isPreviousBoxSelected = box->selectionState() != RenderObject::SelectionNone; } } return result; } RenderObject::SelectionState RootInlineBox::selectionState() { // Walk over all of the selected boxes. RenderObject::SelectionState state = RenderObject::SelectionNone; for (InlineBox* box = firstLeafChild(); box; box = box->nextLeafChild()) { RenderObject::SelectionState boxState = box->selectionState(); if ((boxState == RenderObject::SelectionStart && state == RenderObject::SelectionEnd) || (boxState == RenderObject::SelectionEnd && state == RenderObject::SelectionStart)) state = RenderObject::SelectionBoth; else if (state == RenderObject::SelectionNone || ((boxState == RenderObject::SelectionStart || boxState == RenderObject::SelectionEnd) && (state == RenderObject::SelectionNone || state == RenderObject::SelectionInside))) state = boxState; else if (boxState == RenderObject::SelectionNone && state == RenderObject::SelectionStart) { // We are past the end of the selection. state = RenderObject::SelectionBoth; } if (state == RenderObject::SelectionBoth) break; } return state; } InlineBox* RootInlineBox::firstSelectedBox() { for (InlineBox* box = firstLeafChild(); box; box = box->nextLeafChild()) { if (box->selectionState() != RenderObject::SelectionNone) return box; } return 0; } InlineBox* RootInlineBox::lastSelectedBox() { for (InlineBox* box = lastLeafChild(); box; box = box->prevLeafChild()) { if (box->selectionState() != RenderObject::SelectionNone) return box; } return 0; } LayoutUnit RootInlineBox::selectionTop() const { LayoutUnit selectionTop = m_lineTop; if (m_hasAnnotationsBefore) selectionTop -= computeOverAnnotationAdjustment(m_lineTop); if (!prevRootBox()) return selectionTop; return prevRootBox()->selectionBottom(); } LayoutUnit RootInlineBox::selectionTopAdjustedForPrecedingBlock() const { LayoutUnit top = selectionTop(); RenderObject::SelectionState blockSelectionState = root().block().selectionState(); if (blockSelectionState != RenderObject::SelectionInside && blockSelectionState != RenderObject::SelectionEnd) return top; LayoutSize offsetToBlockBefore; if (RenderBlock* block = root().block().blockBeforeWithinSelectionRoot(offsetToBlockBefore)) { if (block->isRenderParagraph()) { if (RootInlineBox* lastLine = toRenderParagraph(block)->lastRootBox()) { RenderObject::SelectionState lastLineSelectionState = lastLine->selectionState(); if (lastLineSelectionState != RenderObject::SelectionInside && lastLineSelectionState != RenderObject::SelectionStart) return top; LayoutUnit lastLineSelectionBottom = lastLine->selectionBottom() + offsetToBlockBefore.height(); top = std::max(top, lastLineSelectionBottom); } } } return top; } LayoutUnit RootInlineBox::selectionBottom() const { LayoutUnit selectionBottom = m_selectionBottom; if (m_hasAnnotationsAfter) selectionBottom += computeUnderAnnotationAdjustment(m_lineBottom); return selectionBottom; } int RootInlineBox::blockDirectionPointInLine() const { return std::max(lineTop(), selectionTop()); } RenderParagraph& RootInlineBox::block() const { return toRenderParagraph(renderer()); } static bool isEditableLeaf(InlineBox* leaf) { return leaf && leaf->renderer().node() && leaf->renderer().node()->hasEditableStyle(); } InlineBox* RootInlineBox::closestLeafChildForPoint(const IntPoint& pointInContents, bool onlyEditableLeaves) { return closestLeafChildForLogicalLeftPosition(pointInContents.x(), onlyEditableLeaves); } InlineBox* RootInlineBox::closestLeafChildForLogicalLeftPosition(int leftPosition, bool onlyEditableLeaves) { InlineBox* firstLeaf = firstLeafChild(); InlineBox* lastLeaf = lastLeafChild(); if (firstLeaf != lastLeaf) { if (firstLeaf->isLineBreak()) firstLeaf = firstLeaf->nextLeafChildIgnoringLineBreak(); else if (lastLeaf->isLineBreak()) lastLeaf = lastLeaf->prevLeafChildIgnoringLineBreak(); } if (firstLeaf == lastLeaf && (!onlyEditableLeaves || isEditableLeaf(firstLeaf))) return firstLeaf; // Avoid returning a list marker when possible. if (leftPosition <= firstLeaf->logicalLeft() && (!onlyEditableLeaves || isEditableLeaf(firstLeaf))) // The leftPosition coordinate is less or equal to left edge of the firstLeaf. // Return it. return firstLeaf; if (leftPosition >= lastLeaf->logicalRight() && (!onlyEditableLeaves || isEditableLeaf(lastLeaf))) // The leftPosition coordinate is greater or equal to right edge of the lastLeaf. // Return it. return lastLeaf; InlineBox* closestLeaf = 0; for (InlineBox* leaf = firstLeaf; leaf; leaf = leaf->nextLeafChildIgnoringLineBreak()) { if (!onlyEditableLeaves || isEditableLeaf(leaf)) { closestLeaf = leaf; if (leftPosition < leaf->logicalRight()) // The x coordinate is less than the right edge of the box. // Return it. return leaf; } } return closestLeaf ? closestLeaf : lastLeaf; } BidiStatus RootInlineBox::lineBreakBidiStatus() const { return BidiStatus(static_cast(m_lineBreakBidiStatusEor), static_cast(m_lineBreakBidiStatusLastStrong), static_cast(m_lineBreakBidiStatusLast), m_lineBreakContext); } void RootInlineBox::setLineBreakInfo(RenderObject* obj, unsigned breakPos, const BidiStatus& status) { // When setting lineBreakObj, the RenderObject must not be a RenderInline // with no line boxes, otherwise all sorts of invariants are broken later. // This has security implications because if the RenderObject does not // point to at least one line box, then that RenderInline can be deleted // later without resetting the lineBreakObj, leading to use-after-free. ASSERT_WITH_SECURITY_IMPLICATION(!obj || obj->isText() || !(obj->isRenderInline() && obj->isBox() && !toRenderBox(obj)->inlineBoxWrapper())); m_lineBreakObj = obj; m_lineBreakPos = breakPos; m_lineBreakBidiStatusEor = status.eor; m_lineBreakBidiStatusLastStrong = status.lastStrong; m_lineBreakBidiStatusLast = status.last; m_lineBreakContext = status.context; } EllipsisBox* RootInlineBox::ellipsisBox() const { if (!hasEllipsisBox()) return 0; return gEllipsisBoxMap->get(this); } void RootInlineBox::removeLineBoxFromRenderObject() { block().lineBoxes()->removeLineBox(this); } void RootInlineBox::extractLineBoxFromRenderObject() { block().lineBoxes()->extractLineBox(this); } void RootInlineBox::attachLineBoxToRenderObject() { block().lineBoxes()->attachLineBox(this); } LayoutRect RootInlineBox::paddedLayoutOverflowRect(LayoutUnit endPadding) const { LayoutRect lineLayoutOverflow = layoutOverflowRect(lineTop(), lineBottom()); if (!endPadding) return lineLayoutOverflow; if (isLeftToRightDirection()) lineLayoutOverflow.shiftMaxXEdgeTo(std::max(lineLayoutOverflow.maxX(), logicalRight() + endPadding)); else lineLayoutOverflow.shiftXEdgeTo(std::min(lineLayoutOverflow.x(), logicalLeft() - endPadding)); return lineLayoutOverflow; } static void setAscentAndDescent(int& ascent, int& descent, int newAscent, int newDescent, bool& ascentDescentSet) { if (!ascentDescentSet) { ascentDescentSet = true; ascent = newAscent; descent = newDescent; } else { ascent = std::max(ascent, newAscent); descent = std::max(descent, newDescent); } } void RootInlineBox::ascentAndDescentForBox(InlineBox* box, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, int& ascent, int& descent, bool& affectsAscent, bool& affectsDescent) const { bool ascentDescentSet = false; // Replaced boxes will return 0 for the line-height if line-box-contain says they are // not to be included. if (box->renderer().isReplaced()) { if (renderer().style(isFirstLineStyle())->lineBoxContain() & LineBoxContainReplaced) { ascent = box->baselinePosition(baselineType()); descent = box->lineHeight() - ascent; // Replaced elements always affect both the ascent and descent. affectsAscent = true; affectsDescent = true; } return; } Vector* usedFonts = 0; GlyphOverflow* glyphOverflow = 0; if (box->isText()) { GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.find(toInlineTextBox(box)); usedFonts = it == textBoxDataMap.end() ? 0 : &it->value.first; glyphOverflow = it == textBoxDataMap.end() ? 0 : &it->value.second; } bool includeLeading = includeLeadingForBox(box); bool includeFont = includeFontForBox(box); bool setUsedFont = false; bool setUsedFontWithLeading = false; if (usedFonts && !usedFonts->isEmpty() && (includeFont || (box->renderer().style(isFirstLineStyle())->lineHeight().isNegative() && includeLeading))) { usedFonts->append(box->renderer().style(isFirstLineStyle())->font().primaryFont()); for (size_t i = 0; i < usedFonts->size(); ++i) { const FontMetrics& fontMetrics = usedFonts->at(i)->fontMetrics(); int usedFontAscent = fontMetrics.ascent(baselineType()); int usedFontDescent = fontMetrics.descent(baselineType()); int halfLeading = (fontMetrics.lineSpacing() - fontMetrics.height()) / 2; int usedFontAscentAndLeading = usedFontAscent + halfLeading; int usedFontDescentAndLeading = fontMetrics.lineSpacing() - usedFontAscentAndLeading; if (includeFont) { setAscentAndDescent(ascent, descent, usedFontAscent, usedFontDescent, ascentDescentSet); setUsedFont = true; } if (includeLeading) { setAscentAndDescent(ascent, descent, usedFontAscentAndLeading, usedFontDescentAndLeading, ascentDescentSet); setUsedFontWithLeading = true; } if (!affectsAscent) affectsAscent = usedFontAscent - box->logicalTop() > 0; if (!affectsDescent) affectsDescent = usedFontDescent + box->logicalTop() > 0; } } // If leading is included for the box, then we compute that box. if (includeLeading && !setUsedFontWithLeading) { int ascentWithLeading = box->baselinePosition(baselineType()); int descentWithLeading = box->lineHeight() - ascentWithLeading; setAscentAndDescent(ascent, descent, ascentWithLeading, descentWithLeading, ascentDescentSet); // Examine the font box for inline flows and text boxes to see if any part of it is above the baseline. // If the top of our font box relative to the root box baseline is above the root box baseline, then // we are contributing to the maxAscent value. Descent is similar. If any part of our font box is below // the root box's baseline, then we contribute to the maxDescent value. affectsAscent = ascentWithLeading - box->logicalTop() > 0; affectsDescent = descentWithLeading + box->logicalTop() > 0; } if (includeFontForBox(box) && !setUsedFont) { int fontAscent = box->renderer().style(isFirstLineStyle())->fontMetrics().ascent(baselineType()); int fontDescent = box->renderer().style(isFirstLineStyle())->fontMetrics().descent(baselineType()); setAscentAndDescent(ascent, descent, fontAscent, fontDescent, ascentDescentSet); affectsAscent = fontAscent - box->logicalTop() > 0; affectsDescent = fontDescent + box->logicalTop() > 0; } if (includeGlyphsForBox(box) && glyphOverflow && glyphOverflow->computeBounds) { setAscentAndDescent(ascent, descent, glyphOverflow->top, glyphOverflow->bottom, ascentDescentSet); affectsAscent = glyphOverflow->top - box->logicalTop() > 0; affectsDescent = glyphOverflow->bottom + box->logicalTop() > 0; glyphOverflow->top = std::min(glyphOverflow->top, std::max(0, glyphOverflow->top - box->renderer().style(isFirstLineStyle())->fontMetrics().ascent(baselineType()))); glyphOverflow->bottom = std::min(glyphOverflow->bottom, std::max(0, glyphOverflow->bottom - box->renderer().style(isFirstLineStyle())->fontMetrics().descent(baselineType()))); } if (includeMarginForBox(box)) { LayoutUnit ascentWithMargin = box->renderer().style(isFirstLineStyle())->fontMetrics().ascent(baselineType()); LayoutUnit descentWithMargin = box->renderer().style(isFirstLineStyle())->fontMetrics().descent(baselineType()); if (box->parent() && !box->renderer().isText()) { ascentWithMargin += box->boxModelObject()->borderBefore() + box->boxModelObject()->paddingBefore() + box->boxModelObject()->marginBefore(); descentWithMargin += box->boxModelObject()->borderAfter() + box->boxModelObject()->paddingAfter() + box->boxModelObject()->marginAfter(); } setAscentAndDescent(ascent, descent, ascentWithMargin, descentWithMargin, ascentDescentSet); // Treat like a replaced element, since we're using the margin box. affectsAscent = true; affectsDescent = true; } } LayoutUnit RootInlineBox::verticalPositionForBox(InlineBox* box, VerticalPositionCache& verticalPositionCache) { if (box->renderer().isText()) return box->parent()->logicalTop(); RenderBoxModelObject* renderer = box->boxModelObject(); ASSERT(renderer->isInline()); if (!renderer->isInline()) return 0; bool firstLine = false; // Check the cache. bool isRenderInline = renderer->isRenderInline(); if (isRenderInline && !firstLine) { LayoutUnit verticalPosition = verticalPositionCache.get(renderer, baselineType()); if (verticalPosition != PositionUndefined) return verticalPosition; } LayoutUnit verticalPosition = 0; EVerticalAlign verticalAlign = renderer->style()->verticalAlign(); if (verticalAlign == TOP || verticalAlign == BOTTOM) return 0; RenderObject* parent = renderer->parent(); if (parent->isRenderInline() && parent->style()->verticalAlign() != TOP && parent->style()->verticalAlign() != BOTTOM) verticalPosition = box->parent()->logicalTop(); if (verticalAlign != BASELINE) { const Font& font = parent->style(firstLine)->font(); const FontMetrics& fontMetrics = font.fontMetrics(); int fontSize = font.fontDescription().computedPixelSize(); LineDirectionMode lineDirection = HorizontalLine; if (verticalAlign == SUB) verticalPosition += fontSize / 5 + 1; else if (verticalAlign == SUPER) verticalPosition -= fontSize / 3 + 1; else if (verticalAlign == TEXT_TOP) verticalPosition += renderer->baselinePosition(baselineType(), firstLine, lineDirection) - fontMetrics.ascent(baselineType()); else if (verticalAlign == MIDDLE) verticalPosition = (verticalPosition - static_cast(fontMetrics.xHeight() / 2) - renderer->lineHeight(firstLine, lineDirection) / 2 + renderer->baselinePosition(baselineType(), firstLine, lineDirection)).round(); else if (verticalAlign == TEXT_BOTTOM) { verticalPosition += fontMetrics.descent(baselineType()); // lineHeight - baselinePosition is always 0 for replaced elements (except inline blocks), so don't bother wasting time in that case. if (!renderer->isReplaced() || renderer->isInlineBlock()) verticalPosition -= (renderer->lineHeight(firstLine, lineDirection) - renderer->baselinePosition(baselineType(), firstLine, lineDirection)); } else if (verticalAlign == BASELINE_MIDDLE) verticalPosition += -renderer->lineHeight(firstLine, lineDirection) / 2 + renderer->baselinePosition(baselineType(), firstLine, lineDirection); else if (verticalAlign == LENGTH) { LayoutUnit lineHeight; //Per http://www.w3.org/TR/CSS21/visudet.html#propdef-vertical-align: 'Percentages: refer to the 'line-height' of the element itself'. if (renderer->style()->verticalAlignLength().isPercent()) lineHeight = renderer->style()->computedLineHeight(); else lineHeight = renderer->lineHeight(firstLine, lineDirection); verticalPosition -= valueForLength(renderer->style()->verticalAlignLength(), lineHeight); } } // Store the cached value. if (isRenderInline && !firstLine) verticalPositionCache.set(renderer, baselineType(), verticalPosition); return verticalPosition; } bool RootInlineBox::includeLeadingForBox(InlineBox* box) const { if (box->renderer().isReplaced() || (box->renderer().isText() && !box->isText())) return false; LineBoxContain lineBoxContain = renderer().style()->lineBoxContain(); return (lineBoxContain & LineBoxContainInline) || (box == this && (lineBoxContain & LineBoxContainBlock)); } bool RootInlineBox::includeFontForBox(InlineBox* box) const { if (box->renderer().isReplaced() || (box->renderer().isText() && !box->isText())) return false; if (!box->isText() && box->isInlineFlowBox() && !toInlineFlowBox(box)->hasTextChildren()) return false; // For now map "glyphs" to "font" in vertical text mode until the bounds returned by glyphs aren't garbage. LineBoxContain lineBoxContain = renderer().style()->lineBoxContain(); return lineBoxContain & LineBoxContainFont; } bool RootInlineBox::includeGlyphsForBox(InlineBox* box) const { if (box->renderer().isReplaced() || (box->renderer().isText() && !box->isText())) return false; if (!box->isText() && box->isInlineFlowBox() && !toInlineFlowBox(box)->hasTextChildren()) return false; // FIXME: We can't fit to glyphs yet for vertical text, since the bounds returned are garbage. LineBoxContain lineBoxContain = renderer().style()->lineBoxContain(); return lineBoxContain & LineBoxContainGlyphs; } bool RootInlineBox::includeMarginForBox(InlineBox* box) const { if (box->renderer().isReplaced() || (box->renderer().isText() && !box->isText())) return false; LineBoxContain lineBoxContain = renderer().style()->lineBoxContain(); return lineBoxContain & LineBoxContainInlineBox; } bool RootInlineBox::fitsToGlyphs() const { // FIXME: We can't fit to glyphs yet for vertical text, since the bounds returned are garbage. LineBoxContain lineBoxContain = renderer().style()->lineBoxContain(); return lineBoxContain & LineBoxContainGlyphs; } bool RootInlineBox::includesRootLineBoxFontOrLeading() const { LineBoxContain lineBoxContain = renderer().style()->lineBoxContain(); return (lineBoxContain & LineBoxContainBlock) || (lineBoxContain & LineBoxContainInline) || (lineBoxContain & LineBoxContainFont); } Node* RootInlineBox::getLogicalStartBoxWithNode(InlineBox*& startBox) const { Vector leafBoxesInLogicalOrder; collectLeafBoxesInLogicalOrder(leafBoxesInLogicalOrder); for (size_t i = 0; i < leafBoxesInLogicalOrder.size(); ++i) { if (leafBoxesInLogicalOrder[i]->renderer().node()) { startBox = leafBoxesInLogicalOrder[i]; return startBox->renderer().node(); } } startBox = 0; return 0; } Node* RootInlineBox::getLogicalEndBoxWithNode(InlineBox*& endBox) const { Vector leafBoxesInLogicalOrder; collectLeafBoxesInLogicalOrder(leafBoxesInLogicalOrder); for (size_t i = leafBoxesInLogicalOrder.size(); i > 0; --i) { if (leafBoxesInLogicalOrder[i - 1]->renderer().node()) { endBox = leafBoxesInLogicalOrder[i - 1]; return endBox->renderer().node(); } } endBox = 0; return 0; } #ifndef NDEBUG const char* RootInlineBox::boxName() const { return "RootInlineBox"; } #endif } // namespace blink