blob: 97193424daec3fcdb8f4c74eb564a5a22d27543e [file] [log] [blame]
/*
* Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
* Copyright (C) 2006 Apple Inc.
* Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
* Copyright (C) 2011 Torch Mobile (Beijing) CO. Ltd. 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 "config.h"
#include "SVGRootInlineBox.h"
#include "GraphicsContext.h"
#include "RenderSVGText.h"
#include "RenderSVGTextPath.h"
#include "SVGInlineFlowBox.h"
#include "SVGInlineTextBox.h"
#include "SVGNames.h"
#include "SVGRenderingContext.h"
#include "SVGTextPositioningElement.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(SVGRootInlineBox);
SVGRootInlineBox::SVGRootInlineBox(RenderSVGText& renderSVGText)
: RootInlineBox(renderSVGText)
, m_logicalHeight(0)
{
}
RenderSVGText& SVGRootInlineBox::renderSVGText()
{
return downcast<RenderSVGText>(blockFlow());
}
void SVGRootInlineBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit, LayoutUnit)
{
ASSERT(paintInfo.phase == PaintPhase::Foreground || paintInfo.phase == PaintPhase::Selection);
ASSERT(!paintInfo.context().paintingDisabled());
bool isPrinting = renderSVGText().document().printing();
bool hasSelection = !isPrinting && selectionState() != RenderObject::SelectionNone;
bool shouldPaintSelectionHighlight = !(paintInfo.paintBehavior.contains(PaintBehavior::SkipSelectionHighlight));
PaintInfo childPaintInfo(paintInfo);
if (hasSelection && shouldPaintSelectionHighlight) {
for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) {
if (is<SVGInlineTextBox>(*child))
downcast<SVGInlineTextBox>(*child).paintSelectionBackground(childPaintInfo);
else if (is<SVGInlineFlowBox>(*child))
downcast<SVGInlineFlowBox>(*child).paintSelectionBackground(childPaintInfo);
}
}
SVGRenderingContext renderingContext(renderSVGText(), paintInfo, SVGRenderingContext::SaveGraphicsContext);
if (renderingContext.isRenderingPrepared()) {
for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
child->paint(paintInfo, paintOffset, 0, 0);
}
}
void SVGRootInlineBox::computePerCharacterLayoutInformation()
{
auto& textRoot = downcast<RenderSVGText>(blockFlow());
Vector<SVGTextLayoutAttributes*>& layoutAttributes = textRoot.layoutAttributes();
if (layoutAttributes.isEmpty())
return;
if (textRoot.needsReordering())
reorderValueLists(layoutAttributes);
// Perform SVG text layout phase two (see SVGTextLayoutEngine for details).
SVGTextLayoutEngine characterLayout(layoutAttributes);
layoutCharactersInTextBoxes(this, characterLayout);
// Perform SVG text layout phase three (see SVGTextChunkBuilder for details).
characterLayout.finishLayout();
// Perform SVG text layout phase four
// Position & resize all SVGInlineText/FlowBoxes in the inline box tree, resize the root box as well as the RenderSVGText parent block.
FloatRect childRect;
layoutChildBoxes(this, &childRect);
layoutRootBox(childRect);
}
void SVGRootInlineBox::layoutCharactersInTextBoxes(InlineFlowBox* start, SVGTextLayoutEngine& characterLayout)
{
for (InlineBox* child = start->firstChild(); child; child = child->nextOnLine()) {
if (is<SVGInlineTextBox>(*child)) {
ASSERT(is<RenderSVGInlineText>(child->renderer()));
characterLayout.layoutInlineTextBox(downcast<SVGInlineTextBox>(*child));
} else {
// Skip generated content.
Node* node = child->renderer().node();
if (!node)
continue;
auto& flowBox = downcast<SVGInlineFlowBox>(*child);
bool isTextPath = node->hasTagName(SVGNames::textPathTag);
if (isTextPath) {
// Build text chunks for all <textPath> children, using the line layout algorithm.
// This is needeed as text-anchor is just an additional startOffset for text paths.
SVGTextLayoutEngine lineLayout(characterLayout.layoutAttributes());
layoutCharactersInTextBoxes(&flowBox, lineLayout);
characterLayout.beginTextPathLayout(downcast<RenderSVGTextPath>(child->renderer()), lineLayout);
}
layoutCharactersInTextBoxes(&flowBox, characterLayout);
if (isTextPath)
characterLayout.endTextPathLayout();
}
}
}
void SVGRootInlineBox::layoutChildBoxes(InlineFlowBox* start, FloatRect* childRect)
{
for (InlineBox* child = start->firstChild(); child; child = child->nextOnLine()) {
FloatRect boxRect;
if (is<SVGInlineTextBox>(*child)) {
ASSERT(is<RenderSVGInlineText>(child->renderer()));
auto& textBox = downcast<SVGInlineTextBox>(*child);
boxRect = textBox.calculateBoundaries();
textBox.setX(boxRect.x());
textBox.setY(boxRect.y());
textBox.setLogicalWidth(boxRect.width());
textBox.setLogicalHeight(boxRect.height());
} else {
// Skip generated content.
if (!child->renderer().node())
continue;
auto& flowBox = downcast<SVGInlineFlowBox>(*child);
layoutChildBoxes(&flowBox);
boxRect = flowBox.calculateBoundaries();
flowBox.setX(boxRect.x());
flowBox.setY(boxRect.y());
flowBox.setLogicalWidth(boxRect.width());
flowBox.setLogicalHeight(boxRect.height());
}
if (childRect)
childRect->unite(boxRect);
}
}
void SVGRootInlineBox::layoutRootBox(const FloatRect& childRect)
{
RenderSVGText& parentBlock = renderSVGText();
// Finally, assign the root block position, now that all content is laid out.
LayoutRect boundingRect = enclosingLayoutRect(childRect);
parentBlock.setLocation(boundingRect.location());
parentBlock.setSize(boundingRect.size());
// Position all children relative to the parent block.
for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) {
// Skip generated content.
if (!child->renderer().node())
continue;
child->adjustPosition(-childRect.x(), -childRect.y());
}
// Position ourselves.
setX(0);
setY(0);
setLogicalWidth(childRect.width());
setLogicalHeight(childRect.height());
setLineTopBottomPositions(0, boundingRect.height(), 0, boundingRect.height());
}
InlineBox* SVGRootInlineBox::closestLeafChildForPosition(const LayoutPoint& point)
{
InlineBox* firstLeaf = firstLeafChild();
InlineBox* lastLeaf = lastLeafChild();
if (firstLeaf == lastLeaf)
return firstLeaf;
// FIXME: Check for vertical text!
InlineBox* closestLeaf = nullptr;
for (InlineBox* leaf = firstLeaf; leaf; leaf = leaf->nextLeafChild()) {
if (!leaf->isSVGInlineTextBox())
continue;
if (point.y() < leaf->y())
continue;
if (point.y() > leaf->y() + leaf->virtualLogicalHeight())
continue;
closestLeaf = leaf;
if (point.x() < leaf->left() + leaf->logicalWidth())
return leaf;
}
return closestLeaf ? closestLeaf : lastLeaf;
}
bool SVGRootInlineBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom, HitTestAction hitTestAction)
{
for (InlineBox* leaf = firstLeafChild(); leaf; leaf = leaf->nextLeafChild()) {
if (!leaf->isSVGInlineTextBox())
continue;
if (leaf->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, lineTop, lineBottom, hitTestAction))
return true;
}
return false;
}
static inline void swapItemsInLayoutAttributes(SVGTextLayoutAttributes* firstAttributes, SVGTextLayoutAttributes* lastAttributes, unsigned firstPosition, unsigned lastPosition)
{
SVGCharacterDataMap::iterator itFirst = firstAttributes->characterDataMap().find(firstPosition + 1);
SVGCharacterDataMap::iterator itLast = lastAttributes->characterDataMap().find(lastPosition + 1);
bool firstPresent = itFirst != firstAttributes->characterDataMap().end();
bool lastPresent = itLast != lastAttributes->characterDataMap().end();
if (!firstPresent && !lastPresent)
return;
if (firstPresent && lastPresent) {
std::swap(itFirst->value, itLast->value);
return;
}
if (firstPresent && !lastPresent) {
lastAttributes->characterDataMap().set(lastPosition + 1, itFirst->value);
return;
}
// !firstPresent && lastPresent
firstAttributes->characterDataMap().set(firstPosition + 1, itLast->value);
}
static inline void findFirstAndLastAttributesInVector(Vector<SVGTextLayoutAttributes*>& attributes, RenderSVGInlineText* firstContext, RenderSVGInlineText* lastContext,
SVGTextLayoutAttributes*& first, SVGTextLayoutAttributes*& last)
{
first = nullptr;
last = nullptr;
unsigned attributesSize = attributes.size();
for (unsigned i = 0; i < attributesSize; ++i) {
SVGTextLayoutAttributes* current = attributes[i];
if (!first && firstContext == &current->context())
first = current;
if (!last && lastContext == &current->context())
last = current;
if (first && last)
break;
}
ASSERT(first);
ASSERT(last);
}
static inline void reverseInlineBoxRangeAndValueListsIfNeeded(void* userData, Vector<InlineBox*>::iterator first, Vector<InlineBox*>::iterator last)
{
ASSERT(userData);
Vector<SVGTextLayoutAttributes*>& attributes = *reinterpret_cast<Vector<SVGTextLayoutAttributes*>*>(userData);
// This is a copy of std::reverse(first, last). It additionally assures that the metrics map within the renderers belonging to the InlineBoxes are reordered as well.
while (true) {
if (first == last || first == --last)
return;
if (!is<SVGInlineTextBox>(**last) || !is<SVGInlineTextBox>(**first)) {
InlineBox* temp = *first;
*first = *last;
*last = temp;
++first;
continue;
}
auto& firstTextBox = downcast<SVGInlineTextBox>(**first);
auto& lastTextBox = downcast<SVGInlineTextBox>(**last);
// Reordering is only necessary for BiDi text that is _absolutely_ positioned.
if (firstTextBox.len() == 1 && firstTextBox.len() == lastTextBox.len()) {
RenderSVGInlineText& firstContext = firstTextBox.renderer();
RenderSVGInlineText& lastContext = lastTextBox.renderer();
SVGTextLayoutAttributes* firstAttributes = nullptr;
SVGTextLayoutAttributes* lastAttributes = nullptr;
findFirstAndLastAttributesInVector(attributes, &firstContext, &lastContext, firstAttributes, lastAttributes);
swapItemsInLayoutAttributes(firstAttributes, lastAttributes, firstTextBox.start(), lastTextBox.start());
}
InlineBox* temp = *first;
*first = *last;
*last = temp;
++first;
}
}
void SVGRootInlineBox::reorderValueLists(Vector<SVGTextLayoutAttributes*>& attributes)
{
Vector<InlineBox*> leafBoxesInLogicalOrder;
collectLeafBoxesInLogicalOrder(leafBoxesInLogicalOrder, reverseInlineBoxRangeAndValueListsIfNeeded, &attributes);
}
} // namespace WebCore