SVGTextLayoutAttributesBuilder.cpp [plain text]
#include "config.h"
#if ENABLE(SVG)
#include "SVGTextLayoutAttributesBuilder.h"
#include "RenderSVGInlineText.h"
#include "RenderSVGText.h"
#include "SVGTextPositioningElement.h"
#define DUMP_TEXT_LAYOUT_ATTRIBUTES 0
namespace WebCore {
SVGTextLayoutAttributesBuilder::SVGTextLayoutAttributesBuilder()
: m_textLength(0)
{
}
void SVGTextLayoutAttributesBuilder::buildLayoutAttributesForTextRenderer(RenderSVGInlineText* text)
{
ASSERT(text);
RenderSVGText* textRoot = RenderSVGText::locateRenderSVGTextAncestor(text);
if (!textRoot)
return;
if (!buildLayoutAttributesIfNeeded(textRoot))
return;
m_metricsBuilder.buildMetricsAndLayoutAttributes(textRoot, text, m_characterDataMap);
}
void SVGTextLayoutAttributesBuilder::buildLayoutAttributesForWholeTree(RenderSVGText* textRoot)
{
ASSERT(textRoot);
if (!buildLayoutAttributesIfNeeded(textRoot))
return;
m_metricsBuilder.buildMetricsAndLayoutAttributes(textRoot, 0, m_characterDataMap);
}
void SVGTextLayoutAttributesBuilder::rebuildMetricsForTextRenderer(RenderSVGInlineText* text)
{
ASSERT(text);
m_metricsBuilder.measureTextRenderer(text);
}
void SVGTextLayoutAttributesBuilder::rebuildMetricsForWholeTree(RenderSVGText* textRoot)
{
ASSERT(textRoot);
Vector<SVGTextLayoutAttributes*>& layoutAttributes = textRoot->layoutAttributes();
size_t layoutAttributesSize = layoutAttributes.size();
for (size_t i = 0; i < layoutAttributesSize; ++i)
m_metricsBuilder.measureTextRenderer(layoutAttributes[i]->context());
}
bool SVGTextLayoutAttributesBuilder::buildLayoutAttributesIfNeeded(RenderSVGText* textRoot)
{
ASSERT(textRoot);
if (m_textPositions.isEmpty()) {
m_textLength = 0;
const UChar* lastCharacter = 0;
collectTextPositioningElements(textRoot, lastCharacter);
}
m_characterDataMap.clear();
if (!m_textLength)
return false;
buildLayoutAttributes(textRoot);
return true;
}
static inline void processRenderSVGInlineText(RenderSVGInlineText* text, unsigned& atCharacter, const UChar*& lastCharacter)
{
if (text->style()->whiteSpace() == PRE) {
atCharacter += text->textLength();
return;
}
const UChar* characters = text->characters();
unsigned textLength = text->textLength();
for (unsigned textPosition = 0; textPosition < textLength; ++textPosition) {
const UChar* currentCharacter = characters + textPosition;
if (*currentCharacter == ' ' && (!lastCharacter || *lastCharacter == ' '))
continue;
lastCharacter = currentCharacter;
++atCharacter;
}
}
void SVGTextLayoutAttributesBuilder::collectTextPositioningElements(RenderObject* start, const UChar*& lastCharacter)
{
ASSERT(!start->isSVGText() || m_textPositions.isEmpty());
for (RenderObject* child = start->firstChild(); child; child = child->nextSibling()) {
if (child->isSVGInlineText()) {
processRenderSVGInlineText(toRenderSVGInlineText(child), m_textLength, lastCharacter);
continue;
}
if (!child->isSVGInline())
continue;
SVGTextPositioningElement* element = SVGTextPositioningElement::elementFromRenderer(child);
unsigned atPosition = m_textPositions.size();
if (element)
m_textPositions.append(TextPosition(element, m_textLength));
collectTextPositioningElements(child, lastCharacter);
if (!element)
continue;
TextPosition& position = m_textPositions[atPosition];
ASSERT(!position.length);
position.length = m_textLength - position.start;
}
}
void SVGTextLayoutAttributesBuilder::buildLayoutAttributes(RenderSVGText* textRoot)
{
ASSERT(m_textLength);
SVGTextPositioningElement* outermostTextElement = SVGTextPositioningElement::elementFromRenderer(textRoot);
ASSERT(outermostTextElement);
TextPosition wholeTextPosition(outermostTextElement, 0, m_textLength);
fillCharacterDataMap(wholeTextPosition);
SVGCharacterDataMap::iterator it = m_characterDataMap.find(1);
if (it == m_characterDataMap.end()) {
SVGCharacterData data;
data.x = 0;
data.y = 0;
m_characterDataMap.set(1, data);
} else {
SVGCharacterData& data = it->second;
if (data.x == SVGTextLayoutAttributes::emptyValue())
data.x = 0;
if (data.y == SVGTextLayoutAttributes::emptyValue())
data.y = 0;
}
unsigned size = m_textPositions.size();
for (unsigned i = 0; i < size; ++i)
fillCharacterDataMap(m_textPositions[i]);
#if DUMP_TEXT_LAYOUT_ATTRIBUTES > 0
fprintf(stderr, "\nDumping ALL layout attributes for RenderSVGText, renderer=%p, node=%p (m_textLength: %i)\n", textRoot, textRoot->node(), m_textLength);
m_characterDataMap.dump();
#endif
}
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)
{
if (xList)
data.x = xList->at(i).value(lengthContext);
if (yList)
data.y = yList->at(i).value(lengthContext);
if (dxList)
data.dx = dxList->at(i).value(lengthContext);
if (dyList)
data.dy = dyList->at(i).value(lengthContext);
if (rotateList) {
data.rotate = rotateList->at(i);
lastRotation = data.rotate;
}
}
void SVGTextLayoutAttributesBuilder::fillCharacterDataMap(const TextPosition& position)
{
const SVGLengthList& xList = position.element->x();
const SVGLengthList& yList = position.element->y();
const SVGLengthList& dxList = position.element->dx();
const SVGLengthList& dyList = position.element->dy();
const SVGNumberList& rotateList = position.element->rotate();
unsigned xListSize = xList.size();
unsigned yListSize = yList.size();
unsigned dxListSize = dxList.size();
unsigned dyListSize = dyList.size();
unsigned rotateListSize = rotateList.size();
if (!xListSize && !yListSize && !dxListSize && !dyListSize && !rotateListSize)
return;
float lastRotation = SVGTextLayoutAttributes::emptyValue();
SVGLengthContext lengthContext(position.element);
for (unsigned i = 0; i < position.length; ++i) {
const SVGLengthList* xListPtr = i < xListSize ? &xList : 0;
const SVGLengthList* yListPtr = i < yListSize ? &yList : 0;
const SVGLengthList* dxListPtr = i < dxListSize ? &dxList : 0;
const SVGLengthList* dyListPtr = i < dyListSize ? &dyList : 0;
const SVGNumberList* rotateListPtr = i < rotateListSize ? &rotateList : 0;
if (!xListPtr && !yListPtr && !dxListPtr && !dyListPtr && !rotateListPtr)
break;
SVGCharacterDataMap::iterator it = m_characterDataMap.find(position.start + i + 1);
if (it == m_characterDataMap.end()) {
SVGCharacterData data;
updateCharacterData(i, lastRotation, data, lengthContext, xListPtr, yListPtr, dxListPtr, dyListPtr, rotateListPtr);
m_characterDataMap.set(position.start + i + 1, data);
continue;
}
updateCharacterData(i, lastRotation, it->second, lengthContext, xListPtr, yListPtr, dxListPtr, dyListPtr, rotateListPtr);
}
if (lastRotation == SVGTextLayoutAttributes::emptyValue())
return;
for (unsigned i = rotateList.size(); i < position.length; ++i) {
SVGCharacterDataMap::iterator it = m_characterDataMap.find(position.start + i + 1);
if (it == m_characterDataMap.end()) {
SVGCharacterData data;
data.rotate = lastRotation;
m_characterDataMap.set(position.start + i + 1, data);
continue;
}
it->second.rotate = lastRotation;
}
}
}
#endif // ENABLE(SVG)