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+/*
+ * Copyright (C) 2008 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ * its contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "RenderLineBoxList.h"
+
+#include "HitTestResult.h"
+#include "InlineTextBox.h"
+#include "RenderArena.h"
+#include "RenderInline.h"
+#include "RenderView.h"
+#include "RootInlineBox.h"
+
+using namespace std;
+
+namespace WebCore {
+
+#ifndef NDEBUG
+RenderLineBoxList::~RenderLineBoxList()
+{
+ ASSERT(!m_firstLineBox);
+ ASSERT(!m_lastLineBox);
+}
+#endif
+
+void RenderLineBoxList::appendLineBox(InlineFlowBox* box)
+{
+ checkConsistency();
+
+ if (!m_firstLineBox)
+ m_firstLineBox = m_lastLineBox = box;
+ else {
+ m_lastLineBox->setNextLineBox(box);
+ box->setPreviousLineBox(m_lastLineBox);
+ m_lastLineBox = box;
+ }
+
+ checkConsistency();
+}
+
+void RenderLineBoxList::deleteLineBoxTree(RenderArena* arena)
+{
+ InlineFlowBox* line = m_firstLineBox;
+ InlineFlowBox* nextLine;
+ while (line) {
+ nextLine = line->nextLineBox();
+ line->deleteLine(arena);
+ line = nextLine;
+ }
+ m_firstLineBox = m_lastLineBox = 0;
+}
+
+void RenderLineBoxList::extractLineBox(InlineFlowBox* box)
+{
+ checkConsistency();
+
+ m_lastLineBox = box->prevLineBox();
+ if (box == m_firstLineBox)
+ m_firstLineBox = 0;
+ if (box->prevLineBox())
+ box->prevLineBox()->setNextLineBox(0);
+ box->setPreviousLineBox(0);
+ for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox())
+ curr->setExtracted();
+
+ checkConsistency();
+}
+
+void RenderLineBoxList::attachLineBox(InlineFlowBox* box)
+{
+ checkConsistency();
+
+ if (m_lastLineBox) {
+ m_lastLineBox->setNextLineBox(box);
+ box->setPreviousLineBox(m_lastLineBox);
+ } else
+ m_firstLineBox = box;
+ InlineFlowBox* last = box;
+ for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) {
+ curr->setExtracted(false);
+ last = curr;
+ }
+ m_lastLineBox = last;
+
+ checkConsistency();
+}
+
+void RenderLineBoxList::removeLineBox(InlineFlowBox* box)
+{
+ checkConsistency();
+
+ if (box == m_firstLineBox)
+ m_firstLineBox = box->nextLineBox();
+ if (box == m_lastLineBox)
+ m_lastLineBox = box->prevLineBox();
+ if (box->nextLineBox())
+ box->nextLineBox()->setPreviousLineBox(box->prevLineBox());
+ if (box->prevLineBox())
+ box->prevLineBox()->setNextLineBox(box->nextLineBox());
+
+ checkConsistency();
+}
+
+void RenderLineBoxList::deleteLineBoxes(RenderArena* arena)
+{
+ if (m_firstLineBox) {
+ InlineFlowBox* next;
+ for (InlineFlowBox* curr = m_firstLineBox; curr; curr = next) {
+ next = curr->nextLineBox();
+ curr->destroy(arena);
+ }
+ m_firstLineBox = 0;
+ m_lastLineBox = 0;
+ }
+}
+
+void RenderLineBoxList::dirtyLineBoxes()
+{
+ for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox())
+ curr->dirtyLineBoxes();
+}
+
+bool RenderLineBoxList::rangeIntersectsRect(RenderBoxModelObject* renderer, int logicalTop, int logicalBottom, const IntRect& rect, int tx, int ty) const
+{
+ RenderBox* block;
+ if (renderer->isBox())
+ block = toRenderBox(renderer);
+ else
+ block = renderer->containingBlock();
+ int physicalStart = block->flipForWritingMode(logicalTop);
+ int physicalEnd = block->flipForWritingMode(logicalBottom);
+ int physicalExtent = abs(physicalEnd - physicalStart);
+ physicalStart = min(physicalStart, physicalEnd);
+
+ if (renderer->style()->isHorizontalWritingMode()) {
+ physicalStart += ty;
+ if (physicalStart >= rect.bottom() || physicalStart + physicalExtent <= rect.y())
+ return false;
+ } else {
+ physicalStart += tx;
+ if (physicalStart >= rect.right() || physicalStart + physicalExtent <= rect.x())
+ return false;
+ }
+
+ return true;
+}
+
+bool RenderLineBoxList::anyLineIntersectsRect(RenderBoxModelObject* renderer, const IntRect& rect, int tx, int ty, bool usePrintRect, int outlineSize) const
+{
+ // We can check the first box and last box and avoid painting/hit testing if we don't
+ // intersect. This is a quick short-circuit that we can take to avoid walking any lines.
+ // FIXME: This check is flawed in the following extremely obscure way:
+ // if some line in the middle has a huge overflow, it might actually extend below the last line.
+ int firstLineTop = firstLineBox()->logicalTopVisualOverflow();
+ if (usePrintRect && !firstLineBox()->parent())
+ firstLineTop = min(firstLineTop, firstLineBox()->root()->lineTop());
+ int lastLineBottom = lastLineBox()->logicalBottomVisualOverflow();
+ if (usePrintRect && !lastLineBox()->parent())
+ lastLineBottom = max(lastLineBottom, lastLineBox()->root()->lineBottom());
+ int logicalTop = firstLineTop - outlineSize;
+ int logicalBottom = outlineSize + lastLineBottom;
+
+ return rangeIntersectsRect(renderer, logicalTop, logicalBottom, rect, tx, ty);
+}
+
+bool RenderLineBoxList::lineIntersectsDirtyRect(RenderBoxModelObject* renderer, InlineFlowBox* box, const PaintInfo& paintInfo, int tx, int ty) const
+{
+ int logicalTop = min(box->logicalTopVisualOverflow(), box->root()->selectionTop()) - renderer->maximalOutlineSize(paintInfo.phase);
+ int logicalBottom = box->logicalBottomVisualOverflow() + renderer->maximalOutlineSize(paintInfo.phase);
+
+ return rangeIntersectsRect(renderer, logicalTop, logicalBottom, paintInfo.rect, tx, ty);
+}
+
+void RenderLineBoxList::paint(RenderBoxModelObject* renderer, PaintInfo& paintInfo, int tx, int ty) const
+{
+ // Only paint during the foreground/selection phases.
+ if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseOutline
+ && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines && paintInfo.phase != PaintPhaseTextClip
+ && paintInfo.phase != PaintPhaseMask)
+ return;
+
+ ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer.
+
+ // If we have no lines then we have no work to do.
+ if (!firstLineBox())
+ return;
+
+ // FIXME: Paint-time pagination is obsolete and is now only used by embedded WebViews inside AppKit
+ // NSViews. Do not add any more code for this.
+ RenderView* v = renderer->view();
+ bool usePrintRect = !v->printRect().isEmpty();
+ int outlineSize = renderer->maximalOutlineSize(paintInfo.phase);
+ if (!anyLineIntersectsRect(renderer, paintInfo.rect, tx, ty, usePrintRect, outlineSize))
+ return;
+
+ PaintInfo info(paintInfo);
+ ListHashSet<RenderInline*> outlineObjects;
+ info.outlineObjects = &outlineObjects;
+
+ // See if our root lines intersect with the dirty rect. If so, then we paint
+ // them. Note that boxes can easily overlap, so we can't make any assumptions
+ // based off positions of our first line box or our last line box.
+ for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) {
+ if (usePrintRect) {
+ // FIXME: This is the deprecated pagination model that is still needed
+ // for embedded views inside AppKit. AppKit is incapable of paginating vertical
+ // text pages, so we don't have to deal with vertical lines at all here.
+ int topForPaginationCheck = curr->topVisualOverflow();
+ int bottomForPaginationCheck = curr->bottomVisualOverflow();
+ if (!curr->parent()) {
+ // We're a root box. Use lineTop and lineBottom as well here.
+ topForPaginationCheck = min(topForPaginationCheck, curr->root()->lineTop());
+ bottomForPaginationCheck = max(bottomForPaginationCheck, curr->root()->lineBottom());
+ }
+ if (bottomForPaginationCheck - topForPaginationCheck <= v->printRect().height()) {
+ if (ty + bottomForPaginationCheck > v->printRect().bottom()) {
+ if (RootInlineBox* nextRootBox = curr->root()->nextRootBox())
+ bottomForPaginationCheck = min(bottomForPaginationCheck, min(nextRootBox->topVisualOverflow(), nextRootBox->lineTop()));
+ }
+ if (ty + bottomForPaginationCheck > v->printRect().bottom()) {
+ if (ty + topForPaginationCheck < v->truncatedAt())
+ v->setBestTruncatedAt(ty + topForPaginationCheck, renderer);
+ // If we were able to truncate, don't paint.
+ if (ty + topForPaginationCheck >= v->truncatedAt())
+ break;
+ }
+ }
+ }
+
+ if (lineIntersectsDirtyRect(renderer, curr, info, tx, ty))
+ curr->paint(info, tx, ty);
+ }
+
+ if (info.phase == PaintPhaseOutline || info.phase == PaintPhaseSelfOutline || info.phase == PaintPhaseChildOutlines) {
+ ListHashSet<RenderInline*>::iterator end = info.outlineObjects->end();
+ for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects->begin(); it != end; ++it) {
+ RenderInline* flow = *it;
+ flow->paintOutline(info.context, tx, ty);
+ }
+ info.outlineObjects->clear();
+ }
+}
+
+
+bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction) const
+{
+ if (hitTestAction != HitTestForeground)
+ return false;
+
+ ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer.
+
+ // If we have no lines then we have no work to do.
+ if (!firstLineBox())
+ return false;
+
+ bool isHorizontal = firstLineBox()->isHorizontal();
+
+ int logicalPointStart = isHorizontal ? y - result.topPadding() : x - result.leftPadding();
+ int logicalPointEnd = (isHorizontal ? y + result.bottomPadding() : x + result.rightPadding()) + 1;
+ IntRect rect(isHorizontal ? x : logicalPointStart, isHorizontal ? logicalPointStart : y,
+ isHorizontal ? 1 : logicalPointEnd - logicalPointStart,
+ isHorizontal ? logicalPointEnd - logicalPointStart : 1);
+ if (!anyLineIntersectsRect(renderer, rect, tx, ty))
+ return false;
+
+ // See if our root lines contain the point. If so, then we hit test
+ // them further. Note that boxes can easily overlap, so we can't make any assumptions
+ // based off positions of our first line box or our last line box.
+ for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) {
+ if (rangeIntersectsRect(renderer, curr->logicalTopVisualOverflow(), curr->logicalBottomVisualOverflow(), rect, tx, ty)) {
+ bool inside = curr->nodeAtPoint(request, result, x, y, tx, ty);
+ if (inside) {
+ renderer->updateHitTestResult(result, IntPoint(x - tx, y - ty));
+ return true;
+ }
+ }
+ }
+
+ return false;
+}
+
+void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child)
+{
+ if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isBlockFlow())))
+ return;
+
+ // If we have no first line box, then just bail early.
+ if (!firstLineBox()) {
+ // For an empty inline, go ahead and propagate the check up to our parent, unless the parent
+ // is already dirty.
+ if (container->isInline() && !container->parent()->selfNeedsLayout())
+ container->parent()->dirtyLinesFromChangedChild(container);
+ return;
+ }
+
+ // Try to figure out which line box we belong in. First try to find a previous
+ // line box by examining our siblings. If we didn't find a line box, then use our
+ // parent's first line box.
+ RootInlineBox* box = 0;
+ RenderObject* curr = 0;
+ for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) {
+ if (curr->isFloatingOrPositioned())
+ continue;
+
+ if (curr->isReplaced()) {
+ InlineBox* wrapper = toRenderBox(curr)->inlineBoxWrapper();
+ if (wrapper)
+ box = wrapper->root();
+ } else if (curr->isText()) {
+ InlineTextBox* textBox = toRenderText(curr)->lastTextBox();
+ if (textBox)
+ box = textBox->root();
+ } else if (curr->isRenderInline()) {
+ InlineFlowBox* flowBox = toRenderInline(curr)->lastLineBox();
+ if (flowBox)
+ box = flowBox->root();
+ }
+
+ if (box)
+ break;
+ }
+ if (!box)
+ box = firstLineBox()->root();
+
+ // If we found a line box, then dirty it.
+ if (box) {
+ RootInlineBox* adjacentBox;
+ box->markDirty();
+
+ // dirty the adjacent lines that might be affected
+ // NOTE: we dirty the previous line because RootInlineBox objects cache
+ // the address of the first object on the next line after a BR, which we may be
+ // invalidating here. For more info, see how RenderBlock::layoutInlineChildren
+ // calls setLineBreakInfo with the result of findNextLineBreak. findNextLineBreak,
+ // despite the name, actually returns the first RenderObject after the BR.
+ // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize."
+ adjacentBox = box->prevRootBox();
+ if (adjacentBox)
+ adjacentBox->markDirty();
+ if (child->isBR() || (curr && curr->isBR())) {
+ adjacentBox = box->nextRootBox();
+ if (adjacentBox)
+ adjacentBox->markDirty();
+ }
+ }
+}
+
+#ifndef NDEBUG
+
+void RenderLineBoxList::checkConsistency() const
+{
+#ifdef CHECK_CONSISTENCY
+ const InlineFlowBox* prev = 0;
+ for (const InlineFlowBox* child = m_firstLineBox; child != 0; child = child->nextLineBox()) {
+ ASSERT(child->prevLineBox() == prev);
+ prev = child;
+ }
+ ASSERT(prev == m_lastLineBox);
+#endif
+}
+
+#endif
+
+}
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