235 lines
8.5 KiB
C++
235 lines
8.5 KiB
C++
/*
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* Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "SVGTextLayoutAttributesBuilder.h"
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#include "RenderChildIterator.h"
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#include "RenderSVGInline.h"
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#include "RenderSVGInlineText.h"
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#include "RenderSVGText.h"
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#include "SVGTextPositioningElement.h"
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namespace WebCore {
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SVGTextLayoutAttributesBuilder::SVGTextLayoutAttributesBuilder()
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: m_textLength(0)
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{
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}
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void SVGTextLayoutAttributesBuilder::buildLayoutAttributesForTextRenderer(RenderSVGInlineText& text)
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{
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auto* textRoot = RenderSVGText::locateRenderSVGTextAncestor(text);
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if (!textRoot)
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return;
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if (m_textPositions.isEmpty()) {
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m_characterDataMap.clear();
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m_textLength = 0;
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bool lastCharacterWasSpace = true;
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collectTextPositioningElements(*textRoot, lastCharacterWasSpace);
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if (!m_textLength)
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return;
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buildCharacterDataMap(*textRoot);
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}
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m_metricsBuilder.buildMetricsAndLayoutAttributes(*textRoot, &text, m_characterDataMap);
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}
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bool SVGTextLayoutAttributesBuilder::buildLayoutAttributesForForSubtree(RenderSVGText& textRoot)
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{
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m_characterDataMap.clear();
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if (m_textPositions.isEmpty()) {
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m_textLength = 0;
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bool lastCharacterWasSpace = true;
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collectTextPositioningElements(textRoot, lastCharacterWasSpace);
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}
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if (!m_textLength)
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return false;
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buildCharacterDataMap(textRoot);
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m_metricsBuilder.buildMetricsAndLayoutAttributes(textRoot, nullptr, m_characterDataMap);
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return true;
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}
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void SVGTextLayoutAttributesBuilder::rebuildMetricsForTextRenderer(RenderSVGInlineText& text)
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{
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m_metricsBuilder.measureTextRenderer(text);
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}
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static inline void processRenderSVGInlineText(const RenderSVGInlineText& text, unsigned& atCharacter, bool& lastCharacterWasSpace)
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{
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auto& string = text.text();
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auto length = string.length();
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if (text.style().whiteSpace() == WhiteSpace::Pre) {
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atCharacter += length;
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return;
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}
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// FIXME: This is not a complete whitespace collapsing implementation; it doesn't handle newlines or tabs.
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for (unsigned i = 0; i < length; ++i) {
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UChar character = string[i];
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if (character == ' ' && lastCharacterWasSpace)
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continue;
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lastCharacterWasSpace = character == ' ';
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++atCharacter;
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}
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}
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void SVGTextLayoutAttributesBuilder::collectTextPositioningElements(RenderBoxModelObject& start, bool& lastCharacterWasSpace)
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{
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ASSERT(!is<RenderSVGText>(start) || m_textPositions.isEmpty());
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for (auto& child : childrenOfType<RenderObject>(start)) {
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if (is<RenderSVGInlineText>(child)) {
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processRenderSVGInlineText(downcast<RenderSVGInlineText>(child), m_textLength, lastCharacterWasSpace);
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continue;
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}
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if (!is<RenderSVGInline>(child))
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continue;
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auto& inlineChild = downcast<RenderSVGInline>(child);
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SVGTextPositioningElement* element = SVGTextPositioningElement::elementFromRenderer(inlineChild);
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unsigned atPosition = m_textPositions.size();
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if (element)
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m_textPositions.append(TextPosition(element, m_textLength));
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collectTextPositioningElements(inlineChild, lastCharacterWasSpace);
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if (!element)
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continue;
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// Update text position, after we're back from recursion.
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TextPosition& position = m_textPositions[atPosition];
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ASSERT(!position.length);
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position.length = m_textLength - position.start;
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}
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}
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void SVGTextLayoutAttributesBuilder::buildCharacterDataMap(RenderSVGText& textRoot)
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{
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SVGTextPositioningElement* outermostTextElement = SVGTextPositioningElement::elementFromRenderer(textRoot);
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ASSERT(outermostTextElement);
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// Grab outermost <text> element value lists and insert them in the character data map.
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TextPosition wholeTextPosition(outermostTextElement, 0, m_textLength);
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fillCharacterDataMap(wholeTextPosition);
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// Handle x/y default attributes.
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SVGCharacterDataMap::iterator it = m_characterDataMap.find(1);
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if (it == m_characterDataMap.end()) {
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SVGCharacterData data;
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data.x = 0;
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data.y = 0;
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m_characterDataMap.set(1, data);
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} else {
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SVGCharacterData& data = it->value;
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if (data.x == SVGTextLayoutAttributes::emptyValue())
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data.x = 0;
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if (data.y == SVGTextLayoutAttributes::emptyValue())
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data.y = 0;
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}
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// Fill character data map using child text positioning elements in top-down order.
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unsigned size = m_textPositions.size();
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for (unsigned i = 0; i < size; ++i)
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fillCharacterDataMap(m_textPositions[i]);
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}
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static inline void updateCharacterData(unsigned i, float& lastRotation, SVGCharacterData& data, const SVGLengthContext& lengthContext, const SVGLengthList* xList, const SVGLengthList* yList, const SVGLengthList* dxList, const SVGLengthList* dyList, const SVGNumberList* rotateList)
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{
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if (xList)
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data.x = xList->items()[i]->value().value(lengthContext);
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if (yList)
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data.y = yList->items()[i]->value().value(lengthContext);
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if (dxList)
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data.dx = dxList->items()[i]->value().value(lengthContext);
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if (dyList)
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data.dy = dyList->items()[i]->value().value(lengthContext);
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if (rotateList) {
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data.rotate = rotateList->items()[i]->value();
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lastRotation = data.rotate;
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}
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}
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void SVGTextLayoutAttributesBuilder::fillCharacterDataMap(const TextPosition& position)
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{
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const auto& xList = position.element->x();
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const auto& yList = position.element->y();
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const auto& dxList = position.element->dx();
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const auto& dyList = position.element->dy();
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const auto& rotateList = position.element->rotate();
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unsigned xListSize = xList.size();
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unsigned yListSize = yList.size();
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unsigned dxListSize = dxList.size();
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unsigned dyListSize = dyList.size();
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unsigned rotateListSize = rotateList.items().size();
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if (!xListSize && !yListSize && !dxListSize && !dyListSize && !rotateListSize)
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return;
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float lastRotation = SVGTextLayoutAttributes::emptyValue();
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SVGLengthContext lengthContext(position.element);
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for (unsigned i = 0; i < position.length; ++i) {
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const SVGLengthList* xListPtr = i < xListSize ? &xList : nullptr;
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const SVGLengthList* yListPtr = i < yListSize ? &yList : nullptr;
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const SVGLengthList* dxListPtr = i < dxListSize ? &dxList : nullptr;
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const SVGLengthList* dyListPtr = i < dyListSize ? &dyList : nullptr;
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const SVGNumberList* rotateListPtr = i < rotateListSize ? &rotateList : nullptr;
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if (!xListPtr && !yListPtr && !dxListPtr && !dyListPtr && !rotateListPtr)
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break;
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SVGCharacterDataMap::iterator it = m_characterDataMap.find(position.start + i + 1);
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if (it == m_characterDataMap.end()) {
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SVGCharacterData data;
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updateCharacterData(i, lastRotation, data, lengthContext, xListPtr, yListPtr, dxListPtr, dyListPtr, rotateListPtr);
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m_characterDataMap.set(position.start + i + 1, data);
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continue;
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}
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updateCharacterData(i, lastRotation, it->value, lengthContext, xListPtr, yListPtr, dxListPtr, dyListPtr, rotateListPtr);
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}
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// The last rotation value always spans the whole scope.
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if (lastRotation == SVGTextLayoutAttributes::emptyValue())
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return;
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for (unsigned i = rotateList.items().size(); i < position.length; ++i) {
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SVGCharacterDataMap::iterator it = m_characterDataMap.find(position.start + i + 1);
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if (it == m_characterDataMap.end()) {
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SVGCharacterData data;
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data.rotate = lastRotation;
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m_characterDataMap.set(position.start + i + 1, data);
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continue;
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}
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it->value.rotate = lastRotation;
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}
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}
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}
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