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/*
* Copyright (C) Research In Motion Limited 2010. 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"
#if ENABLE(SVG)
#include "SVGTextChunkBuilder.h"
#include "RenderSVGInlineText.h"
#include "SVGElement.h"
#include "SVGInlineTextBox.h"
namespace WebCore {
SVGTextChunkBuilder::SVGTextChunkBuilder()
{
}
void SVGTextChunkBuilder::transformationForTextBox(SVGInlineTextBox* textBox, AffineTransform& transform) const
{
DEFINE_STATIC_LOCAL(const AffineTransform, s_identityTransform, ());
if (!m_textBoxTransformations.contains(textBox)) {
transform = s_identityTransform;
return;
}
transform = m_textBoxTransformations.get(textBox);
}
void SVGTextChunkBuilder::buildTextChunks(Vector<SVGInlineTextBox*>& lineLayoutBoxes)
{
if (lineLayoutBoxes.isEmpty())
return;
bool foundStart = false;
unsigned lastChunkStartPosition = 0;
unsigned boxPosition = 0;
unsigned boxCount = lineLayoutBoxes.size();
for (; boxPosition < boxCount; ++boxPosition) {
SVGInlineTextBox* textBox = lineLayoutBoxes.at(boxPosition);
if (!textBox->startsNewTextChunk())
continue;
if (!foundStart) {
lastChunkStartPosition = boxPosition;
foundStart = true;
} else {
ASSERT(boxPosition > lastChunkStartPosition);
addTextChunk(lineLayoutBoxes, lastChunkStartPosition, boxPosition - lastChunkStartPosition);
lastChunkStartPosition = boxPosition;
}
}
if (!foundStart)
return;
if (boxPosition - lastChunkStartPosition > 0)
addTextChunk(lineLayoutBoxes, lastChunkStartPosition, boxPosition - lastChunkStartPosition);
}
void SVGTextChunkBuilder::layoutTextChunks(Vector<SVGInlineTextBox*>& lineLayoutBoxes)
{
buildTextChunks(lineLayoutBoxes);
if (m_textChunks.isEmpty())
return;
unsigned chunkCount = m_textChunks.size();
for (unsigned i = 0; i < chunkCount; ++i)
processTextChunk(m_textChunks.at(i));
m_textChunks.clear();
}
void SVGTextChunkBuilder::addTextChunk(Vector<SVGInlineTextBox*>& lineLayoutBoxes, unsigned boxStart, unsigned boxCount)
{
SVGInlineTextBox* textBox = lineLayoutBoxes.at(boxStart);
ASSERT(textBox);
RenderSVGInlineText* textRenderer = toRenderSVGInlineText(textBox->textRenderer());
ASSERT(textRenderer);
const RenderStyle* style = textRenderer->style();
ASSERT(style);
const SVGRenderStyle* svgStyle = style->svgStyle();
ASSERT(svgStyle);
SVGTextContentElement::SVGLengthAdjustType lengthAdjust = SVGTextContentElement::LENGTHADJUST_UNKNOWN;
float desiredTextLength = 0;
if (SVGTextContentElement* textContentElement = SVGTextContentElement::elementFromRenderer(textRenderer->parent())) {
lengthAdjust = static_cast<SVGTextContentElement::SVGLengthAdjustType>(textContentElement->lengthAdjust());
desiredTextLength = textContentElement->textLength().value(textContentElement);
}
SVGTextChunk chunk(svgStyle->isVerticalWritingMode(), svgStyle->textAnchor(), lengthAdjust, desiredTextLength);
Vector<SVGInlineTextBox*>& boxes = chunk.boxes();
for (unsigned i = boxStart; i < boxStart + boxCount; ++i)
boxes.append(lineLayoutBoxes.at(i));
m_textChunks.append(chunk);
}
void SVGTextChunkBuilder::processTextChunk(const SVGTextChunk& chunk)
{
bool processTextLength = chunk.hasDesiredTextLength();
bool processTextAnchor = chunk.hasTextAnchor();
if (!processTextAnchor && !processTextLength)
return;
const Vector<SVGInlineTextBox*>& boxes = chunk.boxes();
unsigned boxCount = boxes.size();
if (!boxCount)
return;
// Calculate absolute length of whole text chunk (starting from text box 'start', spanning 'length' text boxes).
float chunkLength = 0;
unsigned chunkCharacters = 0;
chunk.calculateLength(chunkLength, chunkCharacters);
bool isVerticalText = chunk.isVerticalText();
if (processTextLength) {
if (chunk.lengthAdjust() == SVGTextContentElement::LENGTHADJUST_SPACING) {
float textLengthShift = (chunk.desiredTextLength() - chunkLength) / chunkCharacters;
unsigned atCharacter = 0;
for (unsigned boxPosition = 0; boxPosition < boxCount; ++boxPosition) {
Vector<SVGTextFragment>& fragments = boxes.at(boxPosition)->textFragments();
if (fragments.isEmpty())
continue;
processTextLengthSpacingCorrection(isVerticalText, textLengthShift, fragments, atCharacter);
}
} else {
ASSERT(chunk.lengthAdjust() == SVGTextContentElement::LENGTHADJUST_SPACINGANDGLYPHS);
float scale = chunk.desiredTextLength() / chunkLength;
AffineTransform spacingAndGlyphsTransform;
bool foundFirstFragment = false;
for (unsigned boxPosition = 0; boxPosition < boxCount; ++boxPosition) {
SVGInlineTextBox* textBox = boxes.at(boxPosition);
Vector<SVGTextFragment>& fragments = textBox->textFragments();
if (fragments.isEmpty())
continue;
if (!foundFirstFragment) {
foundFirstFragment = true;
buildSpacingAndGlyphsTransform(isVerticalText, scale, fragments.first(), spacingAndGlyphsTransform);
}
m_textBoxTransformations.set(textBox, spacingAndGlyphsTransform);
}
}
}
if (!processTextAnchor)
return;
// If we previously applied a lengthAdjust="spacing" correction, we have to recalculate the chunk length, to be able to apply the text-anchor shift.
if (processTextLength && chunk.lengthAdjust() == SVGTextContentElement::LENGTHADJUST_SPACING) {
chunkLength = 0;
chunkCharacters = 0;
chunk.calculateLength(chunkLength, chunkCharacters);
}
float textAnchorShift = chunk.calculateTextAnchorShift(chunkLength);
for (unsigned boxPosition = 0; boxPosition < boxCount; ++boxPosition) {
Vector<SVGTextFragment>& fragments = boxes.at(boxPosition)->textFragments();
if (fragments.isEmpty())
continue;
processTextAnchorCorrection(isVerticalText, textAnchorShift, fragments);
}
}
void SVGTextChunkBuilder::processTextLengthSpacingCorrection(bool isVerticalText, float textLengthShift, Vector<SVGTextFragment>& fragments, unsigned& atCharacter)
{
unsigned fragmentCount = fragments.size();
for (unsigned i = 0; i < fragmentCount; ++i) {
SVGTextFragment& fragment = fragments.at(i);
if (isVerticalText)
fragment.y += textLengthShift * atCharacter;
else
fragment.x += textLengthShift * atCharacter;
atCharacter += fragment.length;
}
}
void SVGTextChunkBuilder::processTextAnchorCorrection(bool isVerticalText, float textAnchorShift, Vector<SVGTextFragment>& fragments)
{
unsigned fragmentCount = fragments.size();
for (unsigned i = 0; i < fragmentCount; ++i) {
SVGTextFragment& fragment = fragments.at(i);
if (isVerticalText)
fragment.y += textAnchorShift;
else
fragment.x += textAnchorShift;
}
}
void SVGTextChunkBuilder::buildSpacingAndGlyphsTransform(bool isVerticalText, float scale, const SVGTextFragment& fragment, AffineTransform& spacingAndGlyphsTransform)
{
spacingAndGlyphsTransform.translate(fragment.x, fragment.y);
if (isVerticalText)
spacingAndGlyphsTransform.scaleNonUniform(1, scale);
else
spacingAndGlyphsTransform.scaleNonUniform(scale, 1);
spacingAndGlyphsTransform.translate(-fragment.x, -fragment.y);
}
}
#endif // ENABLE(SVG)
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