| /* |
| * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 "core/layout/line/InlineFlowBox.h" |
| |
| #include "core/CSSPropertyNames.h" |
| #include "core/dom/Document.h" |
| #include "core/layout/HitTestResult.h" |
| #include "core/layout/api/LineLayoutAPIShim.h" |
| #include "core/layout/api/LineLayoutBox.h" |
| #include "core/layout/api/LineLayoutInline.h" |
| #include "core/layout/api/LineLayoutListMarker.h" |
| #include "core/layout/api/LineLayoutRubyBase.h" |
| #include "core/layout/api/LineLayoutRubyRun.h" |
| #include "core/layout/api/LineLayoutRubyText.h" |
| #include "core/layout/line/GlyphOverflow.h" |
| #include "core/layout/line/InlineTextBox.h" |
| #include "core/layout/line/RootInlineBox.h" |
| #include "core/paint/BoxPainter.h" |
| #include "core/paint/InlineFlowBoxPainter.h" |
| #include "core/style/ShadowList.h" |
| #include "platform/fonts/Font.h" |
| #include "wtf/PtrUtil.h" |
| #include <algorithm> |
| #include <math.h> |
| |
| namespace blink { |
| |
| struct SameSizeAsInlineFlowBox : public InlineBox { |
| void* pointers[5]; |
| uint32_t bitfields : 23; |
| }; |
| |
| static_assert(sizeof(InlineFlowBox) == sizeof(SameSizeAsInlineFlowBox), |
| "InlineFlowBox should stay small"); |
| |
| #if ENABLE(ASSERT) |
| |
| InlineFlowBox::~InlineFlowBox() { |
| if (!m_hasBadChildList) |
| for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) |
| child->setHasBadParent(); |
| } |
| |
| #endif |
| |
| LayoutUnit InlineFlowBox::getFlowSpacingLogicalWidth() { |
| LayoutUnit totWidth = |
| marginBorderPaddingLogicalLeft() + marginBorderPaddingLogicalRight(); |
| for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) { |
| if (curr->isInlineFlowBox()) |
| totWidth += toInlineFlowBox(curr)->getFlowSpacingLogicalWidth(); |
| } |
| return totWidth; |
| } |
| |
| LayoutRect InlineFlowBox::frameRect() const { |
| return LayoutRect(location(), size()); |
| } |
| |
| static void setHasTextDescendantsOnAncestors(InlineFlowBox* box) { |
| while (box && !box->hasTextDescendants()) { |
| box->setHasTextDescendants(); |
| box = box->parent(); |
| } |
| } |
| |
| static inline bool hasIdenticalLineHeightProperties( |
| const ComputedStyle& parentStyle, |
| const ComputedStyle& childStyle, |
| bool isRoot) { |
| return parentStyle.hasIdenticalAscentDescentAndLineGap(childStyle) && |
| parentStyle.lineHeight() == childStyle.lineHeight() && |
| (parentStyle.verticalAlign() == EVerticalAlign::Baseline || isRoot) && |
| childStyle.verticalAlign() == EVerticalAlign::Baseline; |
| } |
| |
| void InlineFlowBox::addToLine(InlineBox* child) { |
| ASSERT(!child->parent()); |
| ASSERT(!child->nextOnLine()); |
| ASSERT(!child->prevOnLine()); |
| checkConsistency(); |
| |
| child->setParent(this); |
| if (!m_firstChild) { |
| m_firstChild = child; |
| m_lastChild = child; |
| } else { |
| m_lastChild->setNextOnLine(child); |
| child->setPrevOnLine(m_lastChild); |
| m_lastChild = child; |
| } |
| child->setFirstLineStyleBit(isFirstLineStyle()); |
| child->setIsHorizontal(isHorizontal()); |
| if (child->isText()) { |
| if (child->getLineLayoutItem().parent() == getLineLayoutItem()) |
| m_hasTextChildren = true; |
| setHasTextDescendantsOnAncestors(this); |
| } else if (child->isInlineFlowBox()) { |
| if (toInlineFlowBox(child)->hasTextDescendants()) |
| setHasTextDescendantsOnAncestors(this); |
| } |
| |
| if (descendantsHaveSameLineHeightAndBaseline() && |
| !child->getLineLayoutItem().isOutOfFlowPositioned()) { |
| const ComputedStyle& parentStyle = |
| getLineLayoutItem().styleRef(isFirstLineStyle()); |
| const ComputedStyle& childStyle = |
| child->getLineLayoutItem().styleRef(isFirstLineStyle()); |
| bool root = isRootInlineBox(); |
| bool shouldClearDescendantsHaveSameLineHeightAndBaseline = false; |
| if (child->getLineLayoutItem().isAtomicInlineLevel()) { |
| shouldClearDescendantsHaveSameLineHeightAndBaseline = true; |
| } else if (child->isText()) { |
| if (child->getLineLayoutItem().isBR() || |
| (child->getLineLayoutItem().parent() != getLineLayoutItem())) { |
| if (!hasIdenticalLineHeightProperties(parentStyle, childStyle, root)) |
| shouldClearDescendantsHaveSameLineHeightAndBaseline = true; |
| } |
| if (childStyle.hasTextCombine() || |
| childStyle.getTextEmphasisMark() != TextEmphasisMarkNone) |
| shouldClearDescendantsHaveSameLineHeightAndBaseline = true; |
| } else { |
| if (child->getLineLayoutItem().isBR()) { |
| // FIXME: This is dumb. We only turn off because current layout test |
| // results expect the <br> to be 0-height on the baseline. |
| // Other than making a zillion tests have to regenerate results, there's |
| // no reason to ditch the optimization here. |
| shouldClearDescendantsHaveSameLineHeightAndBaseline = true; |
| } else { |
| ASSERT(isInlineFlowBox()); |
| InlineFlowBox* childFlowBox = toInlineFlowBox(child); |
| // Check the child's bit, and then also check for differences in font, |
| // line-height, vertical-align |
| if (!childFlowBox->descendantsHaveSameLineHeightAndBaseline() || |
| !hasIdenticalLineHeightProperties(parentStyle, childStyle, root) || |
| childStyle.hasBorder() || childStyle.hasPadding() || |
| childStyle.hasTextCombine()) { |
| shouldClearDescendantsHaveSameLineHeightAndBaseline = true; |
| } |
| } |
| } |
| |
| if (shouldClearDescendantsHaveSameLineHeightAndBaseline) |
| clearDescendantsHaveSameLineHeightAndBaseline(); |
| } |
| |
| if (!child->getLineLayoutItem().isOutOfFlowPositioned()) { |
| if (child->isText()) { |
| const ComputedStyle& childStyle = |
| child->getLineLayoutItem().styleRef(isFirstLineStyle()); |
| if (childStyle.letterSpacing() < 0 || childStyle.textShadow() || |
| childStyle.getTextEmphasisMark() != TextEmphasisMarkNone || |
| childStyle.textStrokeWidth()) |
| child->clearKnownToHaveNoOverflow(); |
| } else if (child->getLineLayoutItem().isAtomicInlineLevel()) { |
| LineLayoutBox box = LineLayoutBox(child->getLineLayoutItem()); |
| if (box.hasOverflowModel() || box.hasSelfPaintingLayer()) |
| child->clearKnownToHaveNoOverflow(); |
| } else if (!child->getLineLayoutItem().isBR() && |
| (child->getLineLayoutItem() |
| .style(isFirstLineStyle()) |
| ->boxShadow() || |
| child->boxModelObject().hasSelfPaintingLayer() || |
| (child->getLineLayoutItem().isListMarker() && |
| !LineLayoutListMarker(child->getLineLayoutItem()) |
| .isInside()) || |
| child->getLineLayoutItem() |
| .style(isFirstLineStyle()) |
| ->hasBorderImageOutsets() || |
| child->getLineLayoutItem() |
| .style(isFirstLineStyle()) |
| ->hasOutline())) { |
| child->clearKnownToHaveNoOverflow(); |
| } |
| |
| if (knownToHaveNoOverflow() && child->isInlineFlowBox() && |
| !toInlineFlowBox(child)->knownToHaveNoOverflow()) |
| clearKnownToHaveNoOverflow(); |
| } |
| |
| checkConsistency(); |
| } |
| |
| void InlineFlowBox::removeChild(InlineBox* child, MarkLineBoxes markDirty) { |
| checkConsistency(); |
| |
| if (markDirty == MarkLineBoxesDirty && !isDirty()) |
| dirtyLineBoxes(); |
| |
| root().childRemoved(child); |
| |
| if (child == m_firstChild) |
| m_firstChild = child->nextOnLine(); |
| if (child == m_lastChild) |
| m_lastChild = child->prevOnLine(); |
| if (child->nextOnLine()) |
| child->nextOnLine()->setPrevOnLine(child->prevOnLine()); |
| if (child->prevOnLine()) |
| child->prevOnLine()->setNextOnLine(child->nextOnLine()); |
| |
| child->setParent(nullptr); |
| |
| checkConsistency(); |
| } |
| |
| void InlineFlowBox::deleteLine() { |
| InlineBox* child = firstChild(); |
| InlineBox* next = nullptr; |
| while (child) { |
| ASSERT(this == child->parent()); |
| next = child->nextOnLine(); |
| #if ENABLE(ASSERT) |
| child->setParent(nullptr); |
| #endif |
| child->deleteLine(); |
| child = next; |
| } |
| #if ENABLE(ASSERT) |
| m_firstChild = nullptr; |
| m_lastChild = nullptr; |
| #endif |
| |
| removeLineBoxFromLayoutObject(); |
| destroy(); |
| } |
| |
| void InlineFlowBox::removeLineBoxFromLayoutObject() { |
| lineBoxes()->removeLineBox(this); |
| } |
| |
| void InlineFlowBox::extractLine() { |
| if (!extracted()) |
| extractLineBoxFromLayoutObject(); |
| for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) |
| child->extractLine(); |
| } |
| |
| void InlineFlowBox::extractLineBoxFromLayoutObject() { |
| lineBoxes()->extractLineBox(this); |
| } |
| |
| void InlineFlowBox::attachLine() { |
| if (extracted()) |
| attachLineBoxToLayoutObject(); |
| for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) |
| child->attachLine(); |
| } |
| |
| void InlineFlowBox::attachLineBoxToLayoutObject() { |
| lineBoxes()->attachLineBox(this); |
| } |
| |
| void InlineFlowBox::move(const LayoutSize& delta) { |
| InlineBox::move(delta); |
| for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) { |
| if (child->getLineLayoutItem().isOutOfFlowPositioned()) |
| continue; |
| child->move(delta); |
| } |
| if (m_overflow) { |
| // FIXME: Rounding error here since overflow was pixel snapped, but nobody |
| // other than list markers passes non-integral values here. |
| m_overflow->move(delta.width(), delta.height()); |
| } |
| } |
| |
| LineBoxList* InlineFlowBox::lineBoxes() const { |
| return LineLayoutInline(getLineLayoutItem()).lineBoxes(); |
| } |
| |
| static inline bool isLastChildForLayoutObject(LineLayoutItem ancestor, |
| LineLayoutItem child) { |
| if (!child) |
| return false; |
| |
| if (child == ancestor) |
| return true; |
| |
| LineLayoutItem curr = child; |
| LineLayoutItem parent = curr.parent(); |
| while (parent && (!parent.isLayoutBlock() || parent.isInline())) { |
| if (parent.slowLastChild() != curr) |
| return false; |
| if (parent == ancestor) |
| return true; |
| |
| curr = parent; |
| parent = curr.parent(); |
| } |
| |
| return true; |
| } |
| |
| static bool isAncestorAndWithinBlock(LineLayoutItem ancestor, |
| LineLayoutItem child) { |
| LineLayoutItem item = child; |
| while (item && (!item.isLayoutBlock() || item.isInline())) { |
| if (item == ancestor) |
| return true; |
| item = item.parent(); |
| } |
| return false; |
| } |
| |
| void InlineFlowBox::determineSpacingForFlowBoxes( |
| bool lastLine, |
| bool isLogicallyLastRunWrapped, |
| LineLayoutItem logicallyLastRunLayoutObject) { |
| // All boxes start off open. They will not apply any margins/border/padding |
| // on any side. |
| bool includeLeftEdge = false; |
| bool includeRightEdge = false; |
| |
| // The root inline box never has borders/margins/padding. |
| if (parent()) { |
| bool ltr = getLineLayoutItem().style()->isLeftToRightDirection(); |
| |
| // Check to see if all initial lines are unconstructed. If so, then |
| // we know the inline began on this line (unless we are a continuation). |
| LineBoxList* lineBoxList = lineBoxes(); |
| if (!lineBoxList->firstLineBox()->isConstructed() && |
| !getLineLayoutItem().isInlineElementContinuation()) { |
| if (getLineLayoutItem().style()->boxDecorationBreak() == |
| BoxDecorationBreakClone) |
| includeLeftEdge = includeRightEdge = true; |
| else if (ltr && lineBoxList->firstLineBox() == this) |
| includeLeftEdge = true; |
| else if (!ltr && lineBoxList->lastLineBox() == this) |
| includeRightEdge = true; |
| } |
| |
| if (!lineBoxList->lastLineBox()->isConstructed()) { |
| LineLayoutInline inlineFlow = LineLayoutInline(getLineLayoutItem()); |
| LineLayoutItem logicallyLastRunLayoutItem(logicallyLastRunLayoutObject); |
| bool isLastObjectOnLine = |
| !isAncestorAndWithinBlock(getLineLayoutItem(), |
| logicallyLastRunLayoutItem) || |
| (isLastChildForLayoutObject(getLineLayoutItem(), |
| logicallyLastRunLayoutItem) && |
| !isLogicallyLastRunWrapped); |
| |
| // We include the border under these conditions: |
| // (1) The next line was not created, or it is constructed. We check the |
| // previous line for rtl. |
| // (2) The logicallyLastRun is not a descendant of this layout object. |
| // (3) The logicallyLastRun is a descendant of this layout object, but it |
| // is the last child of this layout object and it does not wrap to the |
| // next line. |
| // (4) The decoration break is set to clone therefore there will be |
| // borders on every sides. |
| if (getLineLayoutItem().style()->boxDecorationBreak() == |
| BoxDecorationBreakClone) { |
| includeLeftEdge = includeRightEdge = true; |
| } else if (ltr) { |
| if (!nextLineBox() && |
| ((lastLine || isLastObjectOnLine) && !inlineFlow.continuation())) |
| includeRightEdge = true; |
| } else { |
| if ((!prevLineBox() || prevLineBox()->isConstructed()) && |
| ((lastLine || isLastObjectOnLine) && !inlineFlow.continuation())) |
| includeLeftEdge = true; |
| } |
| } |
| } |
| |
| setEdges(includeLeftEdge, includeRightEdge); |
| |
| // Recur into our children. |
| for (InlineBox* currChild = firstChild(); currChild; |
| currChild = currChild->nextOnLine()) { |
| if (currChild->isInlineFlowBox()) { |
| InlineFlowBox* currFlow = toInlineFlowBox(currChild); |
| currFlow->determineSpacingForFlowBoxes( |
| lastLine, isLogicallyLastRunWrapped, logicallyLastRunLayoutObject); |
| } |
| } |
| } |
| |
| LayoutUnit InlineFlowBox::placeBoxesInInlineDirection(LayoutUnit logicalLeft, |
| bool& needsWordSpacing) { |
| // Set our x position. |
| beginPlacingBoxRangesInInlineDirection(logicalLeft); |
| |
| LayoutUnit startLogicalLeft = logicalLeft; |
| logicalLeft += borderLogicalLeft() + paddingLogicalLeft(); |
| |
| LayoutUnit minLogicalLeft = startLogicalLeft; |
| LayoutUnit maxLogicalRight = logicalLeft; |
| |
| placeBoxRangeInInlineDirection(firstChild(), nullptr, logicalLeft, |
| minLogicalLeft, maxLogicalRight, |
| needsWordSpacing); |
| |
| logicalLeft += borderLogicalRight() + paddingLogicalRight(); |
| endPlacingBoxRangesInInlineDirection(startLogicalLeft, logicalLeft, |
| minLogicalLeft, maxLogicalRight); |
| return logicalLeft; |
| } |
| |
| // TODO(wkorman): needsWordSpacing may not need to be a reference in the below. |
| // Seek a test case. |
| void InlineFlowBox::placeBoxRangeInInlineDirection(InlineBox* firstChild, |
| InlineBox* lastChild, |
| LayoutUnit& logicalLeft, |
| LayoutUnit& minLogicalLeft, |
| LayoutUnit& maxLogicalRight, |
| bool& needsWordSpacing) { |
| for (InlineBox* curr = firstChild; curr && curr != lastChild; |
| curr = curr->nextOnLine()) { |
| if (curr->getLineLayoutItem().isText()) { |
| InlineTextBox* text = toInlineTextBox(curr); |
| LineLayoutText rt = text->getLineLayoutItem(); |
| LayoutUnit space; |
| if (rt.textLength()) { |
| if (needsWordSpacing && isSpaceOrNewline(rt.characterAt(text->start()))) |
| space = LayoutUnit(rt.style(isFirstLineStyle()) |
| ->font() |
| .getFontDescription() |
| .wordSpacing()); |
| needsWordSpacing = !isSpaceOrNewline(rt.characterAt(text->end())); |
| } |
| if (isLeftToRightDirection()) { |
| logicalLeft += space; |
| text->setLogicalLeft(logicalLeft); |
| } else { |
| text->setLogicalLeft(logicalLeft); |
| logicalLeft += space; |
| } |
| if (knownToHaveNoOverflow()) |
| minLogicalLeft = std::min(logicalLeft, minLogicalLeft); |
| logicalLeft += text->logicalWidth(); |
| if (knownToHaveNoOverflow()) |
| maxLogicalRight = std::max(logicalLeft, maxLogicalRight); |
| } else { |
| if (curr->getLineLayoutItem().isOutOfFlowPositioned()) { |
| if (curr->getLineLayoutItem() |
| .parent() |
| .style() |
| ->isLeftToRightDirection()) { |
| curr->setLogicalLeft(logicalLeft); |
| } else { |
| // Our offset that we cache needs to be from the edge of the right |
| // border box and not the left border box. We have to subtract |x| |
| // from the width of the block (which can be obtained from the root |
| // line box). |
| curr->setLogicalLeft(root().block().logicalWidth() - logicalLeft); |
| } |
| continue; // The positioned object has no effect on the width. |
| } |
| if (curr->getLineLayoutItem().isLayoutInline()) { |
| InlineFlowBox* flow = toInlineFlowBox(curr); |
| logicalLeft += flow->marginLogicalLeft(); |
| if (knownToHaveNoOverflow()) |
| minLogicalLeft = std::min(logicalLeft, minLogicalLeft); |
| logicalLeft = |
| flow->placeBoxesInInlineDirection(logicalLeft, needsWordSpacing); |
| if (knownToHaveNoOverflow()) |
| maxLogicalRight = std::max(logicalLeft, maxLogicalRight); |
| logicalLeft += flow->marginLogicalRight(); |
| } else if (!curr->getLineLayoutItem().isListMarker() || |
| LineLayoutListMarker(curr->getLineLayoutItem()).isInside()) { |
| // The box can have a different writing-mode than the overall line, so |
| // this is a bit complicated. Just get all the physical margin and |
| // overflow values by hand based off |isHorizontal|. |
| LineLayoutBoxModel box = curr->boxModelObject(); |
| LayoutUnit logicalLeftMargin; |
| LayoutUnit logicalRightMargin; |
| if (isHorizontal()) { |
| logicalLeftMargin = box.marginLeft(); |
| logicalRightMargin = box.marginRight(); |
| } else { |
| logicalLeftMargin = box.marginTop(); |
| logicalRightMargin = box.marginBottom(); |
| } |
| |
| logicalLeft += logicalLeftMargin; |
| curr->setLogicalLeft(logicalLeft); |
| if (knownToHaveNoOverflow()) |
| minLogicalLeft = std::min(logicalLeft, minLogicalLeft); |
| logicalLeft += curr->logicalWidth(); |
| if (knownToHaveNoOverflow()) |
| maxLogicalRight = std::max(logicalLeft, maxLogicalRight); |
| logicalLeft += logicalRightMargin; |
| // If we encounter any space after this inline block then ensure it is |
| // treated as the space between two words. |
| needsWordSpacing = true; |
| } |
| } |
| } |
| } |
| |
| FontBaseline InlineFlowBox::dominantBaseline() const { |
| // Use "central" (Ideographic) baseline if writing-mode is vertical-* and |
| // text-orientation is not sideways-*. |
| // http://dev.w3.org/csswg/css-writing-modes-3/#text-baselines |
| if (!isHorizontal() && |
| getLineLayoutItem() |
| .style(isFirstLineStyle()) |
| ->getFontDescription() |
| .isVerticalAnyUpright()) |
| return IdeographicBaseline; |
| return AlphabeticBaseline; |
| } |
| |
| void InlineFlowBox::adjustMaxAscentAndDescent(int& maxAscent, |
| int& maxDescent, |
| int maxPositionTop, |
| int maxPositionBottom) { |
| int originalMaxAscent = maxAscent; |
| int originalMaxDescent = maxDescent; |
| for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) { |
| // The computed lineheight needs to be extended for the |
| // positioned elements |
| if (curr->getLineLayoutItem().isOutOfFlowPositioned()) |
| continue; // Positioned placeholders don't affect calculations. |
| if (curr->verticalAlign() == EVerticalAlign::Top || |
| curr->verticalAlign() == EVerticalAlign::Bottom) { |
| int lineHeight = curr->lineHeight().round(); |
| if (curr->verticalAlign() == EVerticalAlign::Top) { |
| if (maxAscent + maxDescent < lineHeight) |
| maxDescent = lineHeight - maxAscent; |
| } else { |
| if (maxAscent + maxDescent < lineHeight) |
| maxAscent = lineHeight - maxDescent; |
| } |
| |
| if (maxAscent + maxDescent >= std::max(maxPositionTop, maxPositionBottom)) |
| break; |
| maxAscent = originalMaxAscent; |
| maxDescent = originalMaxDescent; |
| } |
| |
| if (curr->isInlineFlowBox()) |
| toInlineFlowBox(curr)->adjustMaxAscentAndDescent( |
| maxAscent, maxDescent, maxPositionTop, maxPositionBottom); |
| } |
| } |
| |
| void InlineFlowBox::computeLogicalBoxHeights( |
| RootInlineBox* rootBox, |
| LayoutUnit& maxPositionTop, |
| LayoutUnit& maxPositionBottom, |
| int& maxAscent, |
| int& maxDescent, |
| bool& setMaxAscent, |
| bool& setMaxDescent, |
| bool noQuirksMode, |
| GlyphOverflowAndFallbackFontsMap& textBoxDataMap, |
| FontBaseline baselineType, |
| VerticalPositionCache& verticalPositionCache) { |
| // The primary purpose of this function is to compute the maximal ascent and |
| // descent values for a line. |
| // |
| // The maxAscent value represents the distance of the highest point of any box |
| // (typically including line-height) from the root box's baseline. The |
| // maxDescent value represents the distance of the lowest point of any box |
| // (also typically including line-height) from the root box baseline. These |
| // values can be negative. |
| // |
| // A secondary purpose of this function is to store the offset of every box's |
| // baseline from the root box's baseline. This information is cached in the |
| // logicalTop() of every box. We're effectively just using the logicalTop() as |
| // scratch space. |
| // |
| // Because a box can be positioned such that it ends up fully above or fully |
| // below the root line box, we only consider it to affect the maxAscent and |
| // maxDescent values if some part of the box (EXCLUDING leading) is above (for |
| // ascent) or below (for descent) the root box's baseline. |
| bool affectsAscent = false; |
| bool affectsDescent = false; |
| bool checkChildren = !descendantsHaveSameLineHeightAndBaseline(); |
| |
| DCHECK(rootBox); |
| if (!rootBox) |
| return; |
| |
| if (isRootInlineBox()) { |
| // Examine our root box. |
| int ascent = 0; |
| int descent = 0; |
| rootBox->ascentAndDescentForBox(rootBox, textBoxDataMap, ascent, descent, |
| affectsAscent, affectsDescent); |
| if (noQuirksMode || hasTextChildren() || |
| (!checkChildren && hasTextDescendants())) { |
| if (maxAscent < ascent || !setMaxAscent) { |
| maxAscent = ascent; |
| setMaxAscent = true; |
| } |
| if (maxDescent < descent || !setMaxDescent) { |
| maxDescent = descent; |
| setMaxDescent = true; |
| } |
| } |
| } |
| |
| if (!checkChildren) |
| return; |
| |
| for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) { |
| if (curr->getLineLayoutItem().isOutOfFlowPositioned()) |
| continue; // Positioned placeholders don't affect calculations. |
| |
| InlineFlowBox* inlineFlowBox = |
| curr->isInlineFlowBox() ? toInlineFlowBox(curr) : nullptr; |
| |
| bool affectsAscent = false; |
| bool affectsDescent = false; |
| |
| // The verticalPositionForBox function returns the distance between the |
| // child box's baseline and the root box's baseline. The value is negative |
| // if the child box's baseline is above the root box's baseline, and it is |
| // positive if the child box's baseline is below the root box's baseline. |
| curr->setLogicalTop( |
| rootBox->verticalPositionForBox(curr, verticalPositionCache)); |
| |
| int ascent = 0; |
| int descent = 0; |
| rootBox->ascentAndDescentForBox(curr, textBoxDataMap, ascent, descent, |
| affectsAscent, affectsDescent); |
| |
| LayoutUnit boxHeight(ascent + descent); |
| if (curr->verticalAlign() == EVerticalAlign::Top) { |
| if (maxPositionTop < boxHeight) |
| maxPositionTop = boxHeight; |
| } else if (curr->verticalAlign() == EVerticalAlign::Bottom) { |
| if (maxPositionBottom < boxHeight) |
| maxPositionBottom = boxHeight; |
| } else if (!inlineFlowBox || noQuirksMode || |
| inlineFlowBox->hasTextChildren() || |
| (inlineFlowBox->descendantsHaveSameLineHeightAndBaseline() && |
| inlineFlowBox->hasTextDescendants()) || |
| inlineFlowBox->boxModelObject() |
| .hasInlineDirectionBordersOrPadding()) { |
| // Note that these values can be negative. Even though we only affect the |
| // maxAscent and maxDescent values if our box (excluding line-height) was |
| // above (for ascent) or below (for descent) the root baseline, once you |
| // factor in line-height the final box can end up being fully above or |
| // fully below the root box's baseline! This is ok, but what it means is |
| // that ascent and descent (including leading), can end up being negative. |
| // The setMaxAscent and setMaxDescent booleans are used to ensure that |
| // we're willing to initially set maxAscent/Descent to negative values. |
| ascent -= curr->logicalTop().round(); |
| descent += curr->logicalTop().round(); |
| if (affectsAscent && (maxAscent < ascent || !setMaxAscent)) { |
| maxAscent = ascent; |
| setMaxAscent = true; |
| } |
| |
| if (affectsDescent && (maxDescent < descent || !setMaxDescent)) { |
| maxDescent = descent; |
| setMaxDescent = true; |
| } |
| } |
| |
| if (inlineFlowBox) |
| inlineFlowBox->computeLogicalBoxHeights( |
| rootBox, maxPositionTop, maxPositionBottom, maxAscent, maxDescent, |
| setMaxAscent, setMaxDescent, noQuirksMode, textBoxDataMap, |
| baselineType, verticalPositionCache); |
| } |
| } |
| |
| void InlineFlowBox::placeBoxesInBlockDirection( |
| LayoutUnit top, |
| LayoutUnit maxHeight, |
| int maxAscent, |
| bool noQuirksMode, |
| LayoutUnit& lineTop, |
| LayoutUnit& lineBottom, |
| LayoutUnit& selectionBottom, |
| bool& setLineTop, |
| LayoutUnit& lineTopIncludingMargins, |
| LayoutUnit& lineBottomIncludingMargins, |
| bool& hasAnnotationsBefore, |
| bool& hasAnnotationsAfter, |
| FontBaseline baselineType) { |
| bool isRootBox = isRootInlineBox(); |
| if (isRootBox) { |
| const SimpleFontData* fontData = |
| getLineLayoutItem().style(isFirstLineStyle())->font().primaryFont(); |
| DCHECK(fontData); |
| if (!fontData) |
| return; |
| const FontMetrics& fontMetrics = fontData->getFontMetrics(); |
| // RootInlineBoxes are always placed at pixel boundaries in their logical y |
| // direction. Not doing so results in incorrect layout of text decorations, |
| // most notably underlines. |
| setLogicalTop(LayoutUnit( |
| roundToInt(top + maxAscent - fontMetrics.ascent(baselineType)))); |
| } |
| |
| LayoutUnit adjustmentForChildrenWithSameLineHeightAndBaseline; |
| if (descendantsHaveSameLineHeightAndBaseline()) { |
| adjustmentForChildrenWithSameLineHeightAndBaseline = logicalTop(); |
| if (parent()) |
| adjustmentForChildrenWithSameLineHeightAndBaseline += |
| boxModelObject().borderAndPaddingOver(); |
| } |
| |
| for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) { |
| if (curr->getLineLayoutItem().isOutOfFlowPositioned()) |
| continue; // Positioned placeholders don't affect calculations. |
| |
| if (descendantsHaveSameLineHeightAndBaseline()) { |
| curr->moveInBlockDirection( |
| adjustmentForChildrenWithSameLineHeightAndBaseline); |
| continue; |
| } |
| |
| InlineFlowBox* inlineFlowBox = |
| curr->isInlineFlowBox() ? toInlineFlowBox(curr) : nullptr; |
| bool childAffectsTopBottomPos = true; |
| if (curr->verticalAlign() == EVerticalAlign::Top) { |
| curr->setLogicalTop(top); |
| } else if (curr->verticalAlign() == EVerticalAlign::Bottom) { |
| curr->setLogicalTop((top + maxHeight - curr->lineHeight())); |
| } else { |
| if (!noQuirksMode && inlineFlowBox && !inlineFlowBox->hasTextChildren() && |
| !curr->boxModelObject().hasInlineDirectionBordersOrPadding() && |
| !(inlineFlowBox->descendantsHaveSameLineHeightAndBaseline() && |
| inlineFlowBox->hasTextDescendants())) |
| childAffectsTopBottomPos = false; |
| int posAdjust = maxAscent - curr->baselinePosition(baselineType); |
| curr->setLogicalTop(curr->logicalTop() + top + posAdjust); |
| } |
| |
| LayoutUnit newLogicalTop = curr->logicalTop(); |
| LayoutUnit newLogicalTopIncludingMargins = newLogicalTop; |
| LayoutUnit boxHeight = curr->logicalHeight(); |
| LayoutUnit boxHeightIncludingMargins = boxHeight; |
| LayoutUnit borderPaddingHeight; |
| if (curr->isText() || curr->isInlineFlowBox()) { |
| const SimpleFontData* fontData = curr->getLineLayoutItem() |
| .style(isFirstLineStyle()) |
| ->font() |
| .primaryFont(); |
| DCHECK(fontData); |
| if (!fontData) |
| continue; |
| |
| const FontMetrics& fontMetrics = fontData->getFontMetrics(); |
| newLogicalTop += curr->baselinePosition(baselineType) - |
| fontMetrics.ascent(baselineType); |
| if (curr->isInlineFlowBox()) { |
| LineLayoutBoxModel boxObject = |
| LineLayoutBoxModel(curr->getLineLayoutItem()); |
| newLogicalTop -= boxObject.borderAndPaddingOver(); |
| borderPaddingHeight = boxObject.borderAndPaddingLogicalHeight(); |
| } |
| newLogicalTopIncludingMargins = newLogicalTop; |
| } else if (!curr->getLineLayoutItem().isBR()) { |
| LineLayoutBox box = LineLayoutBox(curr->getLineLayoutItem()); |
| newLogicalTopIncludingMargins = newLogicalTop; |
| // TODO(kojii): isHorizontal() does not match to |
| // m_layoutObject.isHorizontalWritingMode(). crbug.com/552954 |
| // ASSERT(curr->isHorizontal() == |
| // curr->getLineLayoutItem().style()->isHorizontalWritingMode()); |
| // We may flip lines in case of verticalLR mode, so we can |
| // assume verticalRL for now. |
| LayoutUnit overSideMargin = |
| curr->isHorizontal() ? box.marginTop() : box.marginRight(); |
| LayoutUnit underSideMargin = |
| curr->isHorizontal() ? box.marginBottom() : box.marginLeft(); |
| newLogicalTop += overSideMargin; |
| boxHeightIncludingMargins += overSideMargin + underSideMargin; |
| } |
| |
| curr->setLogicalTop(newLogicalTop); |
| |
| if (childAffectsTopBottomPos) { |
| if (curr->getLineLayoutItem().isRubyRun()) { |
| // Treat the leading on the first and last lines of ruby runs as not |
| // being part of the overall lineTop/lineBottom. |
| // Really this is a workaround hack for the fact that ruby should have |
| // been done as line layout and not done using inline-block. |
| if (getLineLayoutItem().style()->isFlippedLinesWritingMode() == |
| (curr->getLineLayoutItem().style()->getRubyPosition() == |
| RubyPositionAfter)) |
| hasAnnotationsBefore = true; |
| else |
| hasAnnotationsAfter = true; |
| |
| LineLayoutRubyRun rubyRun = |
| LineLayoutRubyRun(curr->getLineLayoutItem()); |
| if (LineLayoutRubyBase rubyBase = rubyRun.rubyBase()) { |
| LayoutUnit bottomRubyBaseLeading = |
| (curr->logicalHeight() - rubyBase.logicalBottom()) + |
| rubyBase.logicalHeight() - |
| (rubyBase.lastRootBox() ? rubyBase.lastRootBox()->lineBottom() |
| : LayoutUnit()); |
| LayoutUnit topRubyBaseLeading = |
| rubyBase.logicalTop() + (rubyBase.firstRootBox() |
| ? rubyBase.firstRootBox()->lineTop() |
| : LayoutUnit()); |
| newLogicalTop += |
| !getLineLayoutItem().style()->isFlippedLinesWritingMode() |
| ? topRubyBaseLeading |
| : bottomRubyBaseLeading; |
| boxHeight -= (topRubyBaseLeading + bottomRubyBaseLeading); |
| } |
| } |
| if (curr->isInlineTextBox()) { |
| TextEmphasisPosition emphasisMarkPosition; |
| if (toInlineTextBox(curr)->getEmphasisMarkPosition( |
| curr->getLineLayoutItem().styleRef(isFirstLineStyle()), |
| emphasisMarkPosition)) { |
| bool emphasisMarkIsOver = |
| emphasisMarkPosition == TextEmphasisPositionOver; |
| if (emphasisMarkIsOver != |
| curr->getLineLayoutItem() |
| .style(isFirstLineStyle()) |
| ->isFlippedLinesWritingMode()) |
| hasAnnotationsBefore = true; |
| else |
| hasAnnotationsAfter = true; |
| } |
| } |
| |
| if (!setLineTop) { |
| setLineTop = true; |
| lineTop = newLogicalTop; |
| lineTopIncludingMargins = |
| std::min(lineTop, newLogicalTopIncludingMargins); |
| } else { |
| lineTop = std::min(lineTop, newLogicalTop); |
| lineTopIncludingMargins = std::min( |
| lineTop, |
| std::min(lineTopIncludingMargins, newLogicalTopIncludingMargins)); |
| } |
| selectionBottom = std::max( |
| selectionBottom, newLogicalTop + boxHeight - borderPaddingHeight); |
| lineBottom = std::max(lineBottom, newLogicalTop + boxHeight); |
| lineBottomIncludingMargins = std::max( |
| lineBottom, |
| std::max(lineBottomIncludingMargins, |
| newLogicalTopIncludingMargins + boxHeightIncludingMargins)); |
| } |
| |
| // Adjust boxes to use their real box y/height and not the logical height |
| // (as dictated by line-height). |
| if (inlineFlowBox) |
| inlineFlowBox->placeBoxesInBlockDirection( |
| top, maxHeight, maxAscent, noQuirksMode, lineTop, lineBottom, |
| selectionBottom, setLineTop, lineTopIncludingMargins, |
| lineBottomIncludingMargins, hasAnnotationsBefore, hasAnnotationsAfter, |
| baselineType); |
| } |
| |
| if (isRootBox) { |
| if (noQuirksMode || hasTextChildren() || |
| (descendantsHaveSameLineHeightAndBaseline() && hasTextDescendants())) { |
| if (!setLineTop) { |
| setLineTop = true; |
| lineTop = LayoutUnit(pixelSnappedLogicalTop()); |
| lineTopIncludingMargins = lineTop; |
| } else { |
| lineTop = std::min(lineTop, LayoutUnit(pixelSnappedLogicalTop())); |
| lineTopIncludingMargins = std::min(lineTop, lineTopIncludingMargins); |
| } |
| selectionBottom = |
| std::max(selectionBottom, LayoutUnit(pixelSnappedLogicalBottom())); |
| lineBottom = |
| std::max(lineBottom, LayoutUnit(pixelSnappedLogicalBottom())); |
| lineBottomIncludingMargins = |
| std::max(lineBottom, lineBottomIncludingMargins); |
| } |
| |
| if (getLineLayoutItem().style()->isFlippedLinesWritingMode()) |
| flipLinesInBlockDirection(lineTopIncludingMargins, |
| lineBottomIncludingMargins); |
| } |
| } |
| |
| void InlineFlowBox::computeMaxLogicalTop(LayoutUnit& maxLogicalTop) const { |
| for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) { |
| if (curr->getLineLayoutItem().isOutOfFlowPositioned()) |
| continue; // Positioned placeholders don't affect calculations. |
| |
| if (descendantsHaveSameLineHeightAndBaseline()) |
| continue; |
| |
| maxLogicalTop = std::max<LayoutUnit>(maxLogicalTop, curr->y()); |
| LayoutUnit localMaxLogicalTop; |
| if (curr->isInlineFlowBox()) |
| toInlineFlowBox(curr)->computeMaxLogicalTop(localMaxLogicalTop); |
| maxLogicalTop = std::max<LayoutUnit>(maxLogicalTop, localMaxLogicalTop); |
| } |
| } |
| |
| void InlineFlowBox::flipLinesInBlockDirection(LayoutUnit lineTop, |
| LayoutUnit lineBottom) { |
| // Flip the box on the line such that the top is now relative to the |
| // lineBottom instead of the lineTop. |
| setLogicalTop(lineBottom - (logicalTop() - lineTop) - logicalHeight()); |
| |
| for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) { |
| if (curr->getLineLayoutItem().isOutOfFlowPositioned()) |
| continue; // Positioned placeholders aren't affected here. |
| |
| if (curr->isInlineFlowBox()) |
| toInlineFlowBox(curr)->flipLinesInBlockDirection(lineTop, lineBottom); |
| else |
| curr->setLogicalTop(lineBottom - (curr->logicalTop() - lineTop) - |
| curr->logicalHeight()); |
| } |
| } |
| |
| inline void InlineFlowBox::addBoxShadowVisualOverflow( |
| LayoutRect& logicalVisualOverflow) { |
| const ComputedStyle& style = getLineLayoutItem().styleRef(isFirstLineStyle()); |
| |
| // box-shadow on the block element applies to the block and not to the lines, |
| // unless it is modified by :first-line pseudo element. |
| if (!parent() && |
| (!isFirstLineStyle() || &style == getLineLayoutItem().style())) |
| return; |
| |
| WritingMode writingMode = style.getWritingMode(); |
| ShadowList* boxShadow = style.boxShadow(); |
| if (!boxShadow) |
| return; |
| |
| LayoutRectOutsets outsets(boxShadow->rectOutsetsIncludingOriginal()); |
| // Similar to how glyph overflow works, if our lines are flipped, then it's |
| // actually the opposite shadow that applies, since the line is "upside down" |
| // in terms of block coordinates. |
| LayoutRectOutsets logicalOutsets( |
| outsets.logicalOutsetsWithFlippedLines(writingMode)); |
| |
| LayoutRect shadowBounds(logicalFrameRect()); |
| shadowBounds.expand(logicalOutsets); |
| logicalVisualOverflow.unite(shadowBounds); |
| } |
| |
| inline void InlineFlowBox::addBorderOutsetVisualOverflow( |
| LayoutRect& logicalVisualOverflow) { |
| const ComputedStyle& style = getLineLayoutItem().styleRef(isFirstLineStyle()); |
| |
| // border-image-outset on the block element applies to the block and not to |
| // the lines, unless it is modified by :first-line pseudo element. |
| if (!parent() && |
| (!isFirstLineStyle() || &style == getLineLayoutItem().style())) |
| return; |
| |
| if (!style.hasBorderImageOutsets()) |
| return; |
| |
| // Similar to how glyph overflow works, if our lines are flipped, then it's |
| // actually the opposite border that applies, since the line is "upside down" |
| // in terms of block coordinates. vertical-rl is the flipped line mode. |
| LayoutRectOutsets logicalOutsets = |
| style.borderImageOutsets().logicalOutsetsWithFlippedLines( |
| style.getWritingMode()); |
| |
| if (!includeLogicalLeftEdge()) |
| logicalOutsets.setLeft(LayoutUnit()); |
| if (!includeLogicalRightEdge()) |
| logicalOutsets.setRight(LayoutUnit()); |
| |
| LayoutRect borderOutsetBounds(logicalFrameRect()); |
| borderOutsetBounds.expand(logicalOutsets); |
| logicalVisualOverflow.unite(borderOutsetBounds); |
| } |
| |
| inline void InlineFlowBox::addOutlineVisualOverflow( |
| LayoutRect& logicalVisualOverflow) { |
| // Outline on root line boxes is applied to the block and not to the lines. |
| if (!parent()) |
| return; |
| |
| const ComputedStyle& style = getLineLayoutItem().styleRef(isFirstLineStyle()); |
| if (!style.hasOutline()) |
| return; |
| |
| logicalVisualOverflow.inflate(style.outlineOutsetExtent()); |
| } |
| |
| inline void InlineFlowBox::addTextBoxVisualOverflow( |
| InlineTextBox* textBox, |
| GlyphOverflowAndFallbackFontsMap& textBoxDataMap, |
| LayoutRect& logicalVisualOverflow) { |
| if (textBox->knownToHaveNoOverflow()) |
| return; |
| |
| const ComputedStyle& style = |
| textBox->getLineLayoutItem().styleRef(isFirstLineStyle()); |
| |
| GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.find(textBox); |
| GlyphOverflow* glyphOverflow = |
| it == textBoxDataMap.end() ? nullptr : &it->value.second; |
| bool isFlippedLine = style.isFlippedLinesWritingMode(); |
| |
| float topGlyphEdge = glyphOverflow ? (isFlippedLine ? glyphOverflow->bottom |
| : glyphOverflow->top) |
| : 0; |
| float bottomGlyphEdge = |
| glyphOverflow |
| ? (isFlippedLine ? glyphOverflow->top : glyphOverflow->bottom) |
| : 0; |
| float leftGlyphEdge = glyphOverflow ? glyphOverflow->left : 0; |
| float rightGlyphEdge = glyphOverflow ? glyphOverflow->right : 0; |
| |
| float strokeOverflow = style.textStrokeWidth() / 2.0f; |
| float topGlyphOverflow = -strokeOverflow - topGlyphEdge; |
| float bottomGlyphOverflow = strokeOverflow + bottomGlyphEdge; |
| float leftGlyphOverflow = -strokeOverflow - leftGlyphEdge; |
| float rightGlyphOverflow = strokeOverflow + rightGlyphEdge; |
| |
| TextEmphasisPosition emphasisMarkPosition; |
| if (style.getTextEmphasisMark() != TextEmphasisMarkNone && |
| textBox->getEmphasisMarkPosition(style, emphasisMarkPosition)) { |
| float emphasisMarkHeight = |
| style.font().emphasisMarkHeight(style.textEmphasisMarkString()); |
| if ((emphasisMarkPosition == TextEmphasisPositionOver) == |
| (!style.isFlippedLinesWritingMode())) |
| topGlyphOverflow = std::min(topGlyphOverflow, -emphasisMarkHeight); |
| else |
| bottomGlyphOverflow = std::max(bottomGlyphOverflow, emphasisMarkHeight); |
| } |
| |
| // If letter-spacing is negative, we should factor that into right layout |
| // overflow. Even in RTL, letter-spacing is applied to the right, so this is |
| // not an issue with left overflow. |
| rightGlyphOverflow -= |
| std::min(0.0f, style.font().getFontDescription().letterSpacing()); |
| |
| LayoutRectOutsets textShadowLogicalOutsets; |
| if (ShadowList* textShadow = style.textShadow()) |
| textShadowLogicalOutsets = |
| LayoutRectOutsets(textShadow->rectOutsetsIncludingOriginal()) |
| .logicalOutsets(style.getWritingMode()); |
| |
| // FIXME: This code currently uses negative values for expansion of the top |
| // and left edges. This should be cleaned up. |
| LayoutUnit textShadowLogicalTop = -textShadowLogicalOutsets.top(); |
| LayoutUnit textShadowLogicalBottom = textShadowLogicalOutsets.bottom(); |
| LayoutUnit textShadowLogicalLeft = -textShadowLogicalOutsets.left(); |
| LayoutUnit textShadowLogicalRight = textShadowLogicalOutsets.right(); |
| |
| LayoutUnit childOverflowLogicalTop( |
| std::min(textShadowLogicalTop + topGlyphOverflow, topGlyphOverflow)); |
| LayoutUnit childOverflowLogicalBottom(std::max( |
| textShadowLogicalBottom + bottomGlyphOverflow, bottomGlyphOverflow)); |
| LayoutUnit childOverflowLogicalLeft( |
| std::min(textShadowLogicalLeft + leftGlyphOverflow, leftGlyphOverflow)); |
| LayoutUnit childOverflowLogicalRight(std::max( |
| textShadowLogicalRight + rightGlyphOverflow, rightGlyphOverflow)); |
| |
| int enclosingLogicalTopWithOverflow = |
| (textBox->logicalTop() + childOverflowLogicalTop).floor(); |
| int enclosingLogicalBottomWithOverflow = |
| (textBox->logicalBottom() + childOverflowLogicalBottom).ceil(); |
| int enclosingLogicalLeftWithOverflow = |
| (textBox->logicalLeft() + childOverflowLogicalLeft).floor(); |
| int enclosingLogicalRightWithOverflow = |
| (textBox->logicalRight() + childOverflowLogicalRight).ceil(); |
| |
| LayoutUnit logicalTopVisualOverflow = std::min( |
| LayoutUnit(enclosingLogicalTopWithOverflow), logicalVisualOverflow.y()); |
| LayoutUnit logicalBottomVisualOverflow = |
| std::max(LayoutUnit(enclosingLogicalBottomWithOverflow), |
| logicalVisualOverflow.maxY()); |
| LayoutUnit logicalLeftVisualOverflow = std::min( |
| LayoutUnit(enclosingLogicalLeftWithOverflow), logicalVisualOverflow.x()); |
| LayoutUnit logicalRightVisualOverflow = |
| std::max(LayoutUnit(enclosingLogicalRightWithOverflow), |
| logicalVisualOverflow.maxX()); |
| |
| logicalVisualOverflow = |
| LayoutRect(logicalLeftVisualOverflow, logicalTopVisualOverflow, |
| logicalRightVisualOverflow - logicalLeftVisualOverflow, |
| logicalBottomVisualOverflow - logicalTopVisualOverflow); |
| |
| if (logicalVisualOverflow != textBox->logicalFrameRect()) |
| textBox->setLogicalOverflowRect(logicalVisualOverflow); |
| } |
| |
| inline void InlineFlowBox::addReplacedChildOverflow( |
| const InlineBox* inlineBox, |
| LayoutRect& logicalLayoutOverflow, |
| LayoutRect& logicalVisualOverflow) { |
| LineLayoutBox box = LineLayoutBox(inlineBox->getLineLayoutItem()); |
| |
| // Visual overflow only propagates if the box doesn't have a self-painting |
| // layer. This rectangle does not include transforms or relative positioning |
| // (since those objects always have self-painting layers), but it does need to |
| // be adjusted for writing-mode differences. |
| if (!box.hasSelfPaintingLayer()) { |
| LayoutRect childLogicalVisualOverflow = |
| box.logicalVisualOverflowRectForPropagation( |
| getLineLayoutItem().styleRef()); |
| childLogicalVisualOverflow.move(inlineBox->logicalLeft(), |
| inlineBox->logicalTop()); |
| logicalVisualOverflow.unite(childLogicalVisualOverflow); |
| } |
| |
| // Layout overflow internal to the child box only propagates if the child box |
| // doesn't have overflow clip set. Otherwise the child border box propagates |
| // as layout overflow. This rectangle must include transforms and relative |
| // positioning and be adjusted for writing-mode differences. |
| LayoutRect childLogicalLayoutOverflow = |
| box.logicalLayoutOverflowRectForPropagation( |
| getLineLayoutItem().styleRef()); |
| childLogicalLayoutOverflow.move(inlineBox->logicalLeft(), |
| inlineBox->logicalTop()); |
| logicalLayoutOverflow.unite(childLogicalLayoutOverflow); |
| } |
| |
| void InlineFlowBox::computeOverflow( |
| LayoutUnit lineTop, |
| LayoutUnit lineBottom, |
| GlyphOverflowAndFallbackFontsMap& textBoxDataMap) { |
| // If we know we have no overflow, we can just bail. |
| if (knownToHaveNoOverflow()) { |
| ASSERT(!m_overflow); |
| return; |
| } |
| |
| if (m_overflow) |
| m_overflow.reset(); |
| |
| // Visual overflow just includes overflow for stuff we need to issues paint |
| // invalidations for ourselves. Self-painting layers are ignored. |
| // Layout overflow is used to determine scrolling extent, so it still includes |
| // child layers and also factors in transforms, relative positioning, etc. |
| LayoutRect logicalLayoutOverflow( |
| logicalFrameRectIncludingLineHeight(lineTop, lineBottom)); |
| LayoutRect logicalVisualOverflow(logicalLayoutOverflow); |
| |
| addBoxShadowVisualOverflow(logicalVisualOverflow); |
| addBorderOutsetVisualOverflow(logicalVisualOverflow); |
| addOutlineVisualOverflow(logicalVisualOverflow); |
| |
| for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) { |
| if (curr->getLineLayoutItem().isOutOfFlowPositioned()) |
| continue; // Positioned placeholders don't affect calculations. |
| |
| if (curr->getLineLayoutItem().isText()) { |
| InlineTextBox* text = toInlineTextBox(curr); |
| LineLayoutText rt = text->getLineLayoutItem(); |
| if (rt.isBR()) |
| continue; |
| LayoutRect textBoxOverflow(text->logicalFrameRect()); |
| addTextBoxVisualOverflow(text, textBoxDataMap, textBoxOverflow); |
| logicalVisualOverflow.unite(textBoxOverflow); |
| } else if (curr->getLineLayoutItem().isLayoutInline()) { |
| InlineFlowBox* flow = toInlineFlowBox(curr); |
| flow->computeOverflow(lineTop, lineBottom, textBoxDataMap); |
| if (!flow->boxModelObject().hasSelfPaintingLayer()) |
| logicalVisualOverflow.unite( |
| flow->logicalVisualOverflowRect(lineTop, lineBottom)); |
| LayoutRect childLayoutOverflow = |
| flow->logicalLayoutOverflowRect(lineTop, lineBottom); |
| childLayoutOverflow.move( |
| flow->boxModelObject().relativePositionLogicalOffset()); |
| logicalLayoutOverflow.unite(childLayoutOverflow); |
| } else { |
| addReplacedChildOverflow(curr, logicalLayoutOverflow, |
| logicalVisualOverflow); |
| } |
| } |
| |
| setOverflowFromLogicalRects(logicalLayoutOverflow, logicalVisualOverflow, |
| lineTop, lineBottom); |
| } |
| |
| void InlineFlowBox::setLayoutOverflow(const LayoutRect& rect, |
| const LayoutRect& frameBox) { |
| ASSERT(!knownToHaveNoOverflow()); |
| if (frameBox.contains(rect) || rect.isEmpty()) |
| return; |
| |
| if (!m_overflow) |
| m_overflow = WTF::makeUnique<SimpleOverflowModel>(frameBox, frameBox); |
| |
| m_overflow->setLayoutOverflow(rect); |
| } |
| |
| void InlineFlowBox::setVisualOverflow(const LayoutRect& rect, |
| const LayoutRect& frameBox) { |
| ASSERT(!knownToHaveNoOverflow()); |
| if (frameBox.contains(rect) || rect.isEmpty()) |
| return; |
| |
| if (!m_overflow) |
| m_overflow = WTF::makeUnique<SimpleOverflowModel>(frameBox, frameBox); |
| |
| m_overflow->setVisualOverflow(rect); |
| } |
| |
| void InlineFlowBox::setOverflowFromLogicalRects( |
| const LayoutRect& logicalLayoutOverflow, |
| const LayoutRect& logicalVisualOverflow, |
| LayoutUnit lineTop, |
| LayoutUnit lineBottom) { |
| ASSERT(!knownToHaveNoOverflow()); |
| LayoutRect frameBox = frameRectIncludingLineHeight(lineTop, lineBottom); |
| |
| LayoutRect layoutOverflow(isHorizontal() |
| ? logicalLayoutOverflow |
| : logicalLayoutOverflow.transposedRect()); |
| setLayoutOverflow(layoutOverflow, frameBox); |
| |
| LayoutRect visualOverflow(isHorizontal() |
| ? logicalVisualOverflow |
| : logicalVisualOverflow.transposedRect()); |
| setVisualOverflow(visualOverflow, frameBox); |
| } |
| |
| bool InlineFlowBox::nodeAtPoint(HitTestResult& result, |
| const HitTestLocation& locationInContainer, |
| const LayoutPoint& accumulatedOffset, |
| LayoutUnit lineTop, |
| LayoutUnit lineBottom) { |
| LayoutRect overflowRect(visualOverflowRect(lineTop, lineBottom)); |
| flipForWritingMode(overflowRect); |
| overflowRect.moveBy(accumulatedOffset); |
| if (!locationInContainer.intersects(overflowRect)) |
| return false; |
| |
| // We need to hit test both our inline children (Inline Boxes) and culled |
| // inlines (LayoutObjects). We check our inlines in the same order as line |
| // layout but for each inline we additionally need to hit test its culled |
| // inline parents. While hit testing culled inline parents, we can stop once |
| // we reach a non-inline parent or a culled inline associated with a different |
| // inline box. |
| InlineBox* prev; |
| for (InlineBox* curr = lastChild(); curr; curr = prev) { |
| prev = curr->prevOnLine(); |
| |
| // Layers will handle hit testing themselves. |
| if (!curr->boxModelObject() || |
| !curr->boxModelObject().hasSelfPaintingLayer()) { |
| if (curr->nodeAtPoint(result, locationInContainer, accumulatedOffset, |
| lineTop, lineBottom)) { |
| getLineLayoutItem().updateHitTestResult( |
| result, |
| locationInContainer.point() - toLayoutSize(accumulatedOffset)); |
| return true; |
| } |
| } |
| |
| // If the current inline box's layout object and the previous inline box's |
| // layout object are same, we should yield the hit-test to the previous |
| // inline box. |
| if (prev && curr->getLineLayoutItem() == prev->getLineLayoutItem()) |
| continue; |
| |
| // Hit test the culled inline if necessary. |
| LineLayoutItem currLayoutItem = curr->getLineLayoutItem(); |
| while (true) { |
| // If the previous inline box is not a descendant of a current inline's |
| // parent, the parent is a culled inline and we hit test it. |
| // Otherwise, move to the previous inline box because we hit test first |
| // all candidate inline boxes under the parent to take a pre-order tree |
| // traversal in reverse. |
| bool hasSibling = |
| currLayoutItem.previousSibling() || currLayoutItem.nextSibling(); |
| LineLayoutItem culledParent = currLayoutItem.parent(); |
| ASSERT(culledParent); |
| |
| if (culledParent == getLineLayoutItem() || |
| (hasSibling && prev && |
| prev->getLineLayoutItem().isDescendantOf(culledParent))) |
| break; |
| |
| if (culledParent.isLayoutInline() && |
| LineLayoutInline(culledParent) |
| .hitTestCulledInline(result, locationInContainer, |
| accumulatedOffset)) |
| return true; |
| |
| currLayoutItem = culledParent; |
| } |
| } |
| |
| if (getLineLayoutItem().style()->hasBorderRadius()) { |
| LayoutPoint adjustedLocation = accumulatedOffset + overflowRect.location(); |
| if (getLineLayoutItem().isBox() && |
| toLayoutBox(LineLayoutAPIShim::layoutObjectFrom(getLineLayoutItem())) |
| ->hitTestClippedOutByRoundedBorder(locationInContainer, |
| adjustedLocation)) |
| return false; |
| |
| LayoutRect borderRect = logicalFrameRect(); |
| borderRect.moveBy(accumulatedOffset); |
| FloatRoundedRect border = getLineLayoutItem().style()->getRoundedBorderFor( |
| borderRect, includeLogicalLeftEdge(), includeLogicalRightEdge()); |
| if (!locationInContainer.intersects(border)) |
| return false; |
| } |
| |
| // Now check ourselves. |
| LayoutRect rect = |
| InlineFlowBoxPainter(*this).frameRectClampedToLineTopAndBottomIfNeeded(); |
| |
| flipForWritingMode(rect); |
| rect.moveBy(accumulatedOffset); |
| |
| // Pixel snap hit testing. |
| rect = LayoutRect(pixelSnappedIntRect(rect)); |
| if (visibleToHitTestRequest(result.hitTestRequest()) && |
| locationInContainer.intersects(rect)) { |
| // Don't add in m_topLeft here, we want coords in the containing block's |
| // coordinate space. |
| getLineLayoutItem().updateHitTestResult( |
| result, flipForWritingMode(locationInContainer.point() - |
| toLayoutSize(accumulatedOffset))); |
| if (result.addNodeToListBasedTestResult(getLineLayoutItem().node(), |
| locationInContainer, |
| rect) == StopHitTesting) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void InlineFlowBox::paint(const PaintInfo& paintInfo, |
| const LayoutPoint& paintOffset, |
| LayoutUnit lineTop, |
| LayoutUnit lineBottom) const { |
| InlineFlowBoxPainter(*this).paint(paintInfo, paintOffset, lineTop, |
| lineBottom); |
| } |
| |
| bool InlineFlowBox::boxShadowCanBeAppliedToBackground( |
| const FillLayer& lastBackgroundLayer) const { |
| // The checks here match how paintFillLayer() decides whether to clip (if it |
| // does, the shadow |
| // would be clipped out, so it has to be drawn separately). |
| StyleImage* image = lastBackgroundLayer.image(); |
| bool hasFillImage = image && image->canRender(); |
| return (!hasFillImage && !getLineLayoutItem().style()->hasBorderRadius()) || |
| (!prevLineBox() && !nextLineBox()) || !parent(); |
| } |
| |
| InlineBox* InlineFlowBox::firstLeafChild() const { |
| InlineBox* leaf = nullptr; |
| for (InlineBox* child = firstChild(); child && !leaf; |
| child = child->nextOnLine()) |
| leaf = child->isLeaf() ? child : toInlineFlowBox(child)->firstLeafChild(); |
| return leaf; |
| } |
| |
| InlineBox* InlineFlowBox::lastLeafChild() const { |
| InlineBox* leaf = nullptr; |
| for (InlineBox* child = lastChild(); child && !leaf; |
| child = child->prevOnLine()) |
| leaf = child->isLeaf() ? child : toInlineFlowBox(child)->lastLeafChild(); |
| return leaf; |
| } |
| |
| SelectionState InlineFlowBox::getSelectionState() const { |
| return SelectionNone; |
| } |
| |
| bool InlineFlowBox::canAccommodateEllipsis(bool ltr, |
| int blockEdge, |
| int ellipsisWidth) const { |
| for (InlineBox* box = firstChild(); box; box = box->nextOnLine()) { |
| if (!box->canAccommodateEllipsis(ltr, blockEdge, ellipsisWidth)) |
| return false; |
| } |
| return true; |
| } |
| |
| LayoutUnit InlineFlowBox::placeEllipsisBox(bool ltr, |
| LayoutUnit blockLeftEdge, |
| LayoutUnit blockRightEdge, |
| LayoutUnit ellipsisWidth, |
| LayoutUnit& truncatedWidth, |
| bool& foundBox) { |
| LayoutUnit result(-1); |
| // We iterate over all children, the foundBox variable tells us when we've |
| // found the box containing the ellipsis. All boxes after that one in the |
| // flow are hidden. |
| // If our flow is ltr then iterate over the boxes from left to right, |
| // otherwise iterate from right to left. Varying the order allows us to |
| // correctly hide the boxes following the ellipsis. |
| InlineBox* box = ltr ? firstChild() : lastChild(); |
| |
| // NOTE: these will cross after foundBox = true. |
| int visibleLeftEdge = blockLeftEdge.toInt(); |
| int visibleRightEdge = blockRightEdge.toInt(); |
| |
| while (box) { |
| int currResult = |
| box->placeEllipsisBox(ltr, LayoutUnit(visibleLeftEdge), |
| LayoutUnit(visibleRightEdge), ellipsisWidth, |
| truncatedWidth, foundBox) |
| .toInt(); |
| if (currResult != -1 && result == -1) |
| result = LayoutUnit(currResult); |
| |
| if (ltr) { |
| visibleLeftEdge += box->logicalWidth().round(); |
| box = box->nextOnLine(); |
| } else { |
| visibleRightEdge -= box->logicalWidth().round(); |
| box = box->prevOnLine(); |
| } |
| } |
| return result; |
| } |
| |
| void InlineFlowBox::clearTruncation() { |
| for (InlineBox* box = firstChild(); box; box = box->nextOnLine()) |
| box->clearTruncation(); |
| } |
| |
| LayoutUnit InlineFlowBox::computeOverAnnotationAdjustment( |
| LayoutUnit allowedPosition) const { |
| LayoutUnit result; |
| for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) { |
| if (curr->getLineLayoutItem().isOutOfFlowPositioned()) |
| continue; // Positioned placeholders don't affect calculations. |
| |
| if (curr->isInlineFlowBox()) |
| result = std::max(result, |
| toInlineFlowBox(curr)->computeOverAnnotationAdjustment( |
| allowedPosition)); |
| |
| if (curr->getLineLayoutItem().isAtomicInlineLevel() && |
| curr->getLineLayoutItem().isRubyRun() && |
| curr->getLineLayoutItem().style()->getRubyPosition() == |
| RubyPositionBefore) { |
| LineLayoutRubyRun rubyRun = LineLayoutRubyRun(curr->getLineLayoutItem()); |
| LineLayoutRubyText rubyText = rubyRun.rubyText(); |
| if (!rubyText) |
| continue; |
| |
| if (!rubyRun.style()->isFlippedLinesWritingMode()) { |
| LayoutUnit topOfFirstRubyTextLine = |
| rubyText.logicalTop() + (rubyText.firstRootBox() |
| ? rubyText.firstRootBox()->lineTop() |
| : LayoutUnit()); |
| if (topOfFirstRubyTextLine >= 0) |
| continue; |
| topOfFirstRubyTextLine += curr->logicalTop(); |
| result = std::max(result, allowedPosition - topOfFirstRubyTextLine); |
| } else { |
| LayoutUnit bottomOfLastRubyTextLine = |
| rubyText.logicalTop() + (rubyText.lastRootBox() |
| ? rubyText.lastRootBox()->lineBottom() |
| : rubyText.logicalHeight()); |
| if (bottomOfLastRubyTextLine <= curr->logicalHeight()) |
| continue; |
| bottomOfLastRubyTextLine += curr->logicalTop(); |
| result = std::max(result, bottomOfLastRubyTextLine - allowedPosition); |
| } |
| } |
| |
| if (curr->isInlineTextBox()) { |
| const ComputedStyle& style = |
| curr->getLineLayoutItem().styleRef(isFirstLineStyle()); |
| TextEmphasisPosition emphasisMarkPosition; |
| if (style.getTextEmphasisMark() != TextEmphasisMarkNone && |
| toInlineTextBox(curr)->getEmphasisMarkPosition( |
| style, emphasisMarkPosition) && |
| emphasisMarkPosition == TextEmphasisPositionOver) { |
| if (!style.isFlippedLinesWritingMode()) { |
| int topOfEmphasisMark = |
| (curr->logicalTop() - |
| style.font().emphasisMarkHeight(style.textEmphasisMarkString())) |
| .toInt(); |
| result = std::max(result, allowedPosition - topOfEmphasisMark); |
| } else { |
| int bottomOfEmphasisMark = |
| (curr->logicalBottom() + |
| style.font().emphasisMarkHeight(style.textEmphasisMarkString())) |
| .toInt(); |
| result = std::max(result, bottomOfEmphasisMark - allowedPosition); |
| } |
| } |
| } |
| } |
| return result; |
| } |
| |
| LayoutUnit InlineFlowBox::computeUnderAnnotationAdjustment( |
| LayoutUnit allowedPosition) const { |
| LayoutUnit result; |
| for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) { |
| if (curr->getLineLayoutItem().isOutOfFlowPositioned()) |
| continue; // Positioned placeholders don't affect calculations. |
| |
| if (curr->isInlineFlowBox()) |
| result = std::max(result, |
| toInlineFlowBox(curr)->computeUnderAnnotationAdjustment( |
| allowedPosition)); |
| |
| if (curr->getLineLayoutItem().isAtomicInlineLevel() && |
| curr->getLineLayoutItem().isRubyRun() && |
| curr->getLineLayoutItem().style()->getRubyPosition() == |
| RubyPositionAfter) { |
| LineLayoutRubyRun rubyRun = LineLayoutRubyRun(curr->getLineLayoutItem()); |
| LineLayoutRubyText rubyText = rubyRun.rubyText(); |
| if (!rubyText) |
| continue; |
| |
| if (rubyRun.style()->isFlippedLinesWritingMode()) { |
| LayoutUnit topOfFirstRubyTextLine = |
| rubyText.logicalTop() + (rubyText.firstRootBox() |
| ? rubyText.firstRootBox()->lineTop() |
| : LayoutUnit()); |
| if (topOfFirstRubyTextLine >= 0) |
| continue; |
| topOfFirstRubyTextLine += curr->logicalTop(); |
| result = std::max(result, allowedPosition - topOfFirstRubyTextLine); |
| } else { |
| LayoutUnit bottomOfLastRubyTextLine = |
| rubyText.logicalTop() + (rubyText.lastRootBox() |
| ? rubyText.lastRootBox()->lineBottom() |
| : rubyText.logicalHeight()); |
| if (bottomOfLastRubyTextLine <= curr->logicalHeight()) |
| continue; |
| bottomOfLastRubyTextLine += curr->logicalTop(); |
| result = std::max(result, bottomOfLastRubyTextLine - allowedPosition); |
| } |
| } |
| |
| if (curr->isInlineTextBox()) { |
| const ComputedStyle& style = |
| curr->getLineLayoutItem().styleRef(isFirstLineStyle()); |
| if (style.getTextEmphasisMark() != TextEmphasisMarkNone && |
| style.getTextEmphasisPosition() == TextEmphasisPositionUnder) { |
| if (!style.isFlippedLinesWritingMode()) { |
| LayoutUnit bottomOfEmphasisMark = |
| curr->logicalBottom() + |
| style.font().emphasisMarkHeight(style.textEmphasisMarkString()); |
| result = std::max(result, bottomOfEmphasisMark - allowedPosition); |
| } else { |
| LayoutUnit topOfEmphasisMark = |
| curr->logicalTop() - |
| style.font().emphasisMarkHeight(style.textEmphasisMarkString()); |
| result = std::max(result, allowedPosition - topOfEmphasisMark); |
| } |
| } |
| } |
| } |
| return result; |
| } |
| |
| void InlineFlowBox::collectLeafBoxesInLogicalOrder( |
| Vector<InlineBox*>& leafBoxesInLogicalOrder, |
| CustomInlineBoxRangeReverse customReverseImplementation) const { |
| InlineBox* leaf = firstLeafChild(); |
| |
| // FIXME: The reordering code is a copy of parts from BidiResolver:: |
| // createBidiRunsForLine, operating directly on InlineBoxes, instead of |
| // BidiRuns. Investigate on how this code could possibly be shared. |
| unsigned char minLevel = 128; |
| unsigned char maxLevel = 0; |
| |
| // First find highest and lowest levels, and initialize |
| // leafBoxesInLogicalOrder with the leaf boxes in visual order. |
| for (; leaf; leaf = leaf->nextLeafChild()) { |
| minLevel = std::min(minLevel, leaf->bidiLevel()); |
| maxLevel = std::max(maxLevel, leaf->bidiLevel()); |
| leafBoxesInLogicalOrder.append(leaf); |
| } |
| |
| if (getLineLayoutItem().style()->rtlOrdering() == EOrder::Visual) |
| return; |
| |
| // Reverse of reordering of the line (L2 according to Bidi spec): |
| // L2. From the highest level found in the text to the lowest odd level on |
| // each line, reverse any contiguous sequence of characters that are at that |
| // level or higher. |
| |
| // Reversing the reordering of the line is only done up to the lowest odd |
| // level. |
| if (!(minLevel % 2)) |
| ++minLevel; |
| |
| Vector<InlineBox*>::iterator end = leafBoxesInLogicalOrder.end(); |
| while (minLevel <= maxLevel) { |
| Vector<InlineBox*>::iterator it = leafBoxesInLogicalOrder.begin(); |
| while (it != end) { |
| while (it != end) { |
| if ((*it)->bidiLevel() >= minLevel) |
| break; |
| ++it; |
| } |
| Vector<InlineBox*>::iterator first = it; |
| while (it != end) { |
| if ((*it)->bidiLevel() < minLevel) |
| break; |
| ++it; |
| } |
| Vector<InlineBox*>::iterator last = it; |
| if (customReverseImplementation) |
| (*customReverseImplementation)(first, last); |
| else |
| std::reverse(first, last); |
| } |
| ++minLevel; |
| } |
| } |
| |
| const char* InlineFlowBox::boxName() const { |
| return "InlineFlowBox"; |
| } |
| |
| #ifndef NDEBUG |
| |
| void InlineFlowBox::showLineTreeAndMark(const InlineBox* markedBox1, |
| const char* markedLabel1, |
| const InlineBox* markedBox2, |
| const char* markedLabel2, |
| const LayoutObject* obj, |
| int depth) const { |
| InlineBox::showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, |
| markedLabel2, obj, depth); |
| for (const InlineBox* box = firstChild(); box; box = box->nextOnLine()) |
| box->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, |
| obj, depth + 1); |
| } |
| |
| #endif |
| |
| #if ENABLE(ASSERT) |
| void InlineFlowBox::checkConsistency() const { |
| #ifdef CHECK_CONSISTENCY |
| ASSERT(!m_hasBadChildList); |
| const InlineBox* prev = nullptr; |
| for (const InlineBox* child = m_firstChild; child; |
| child = child->nextOnLine()) { |
| ASSERT(child->parent() == this); |
| ASSERT(child->prevOnLine() == prev); |
| prev = child; |
| } |
| ASSERT(prev == m_lastChild); |
| #endif |
| } |
| |
| #endif |
| |
| } // namespace blink |
