SVGTextLayoutAttributesBuilder.cpp [plain text]
#include "config.h"
#include "SVGTextLayoutAttributesBuilder.h"
#include "RenderSVGInlineText.h"
#include "RenderSVGText.h"
#include "SVGTextPositioningElement.h"
namespace WebCore {
SVGTextLayoutAttributesBuilder::SVGTextLayoutAttributesBuilder()
: m_textLength(0)
{
}
void SVGTextLayoutAttributesBuilder::buildLayoutAttributesForTextRenderer(RenderSVGInlineText& text)
{
auto* textRoot = RenderSVGText::locateRenderSVGTextAncestor(text);
if (!textRoot)
return;
if (m_textPositions.isEmpty()) {
m_characterDataMap.clear();
m_textLength = 0;
bool lastCharacterWasSpace = true;
collectTextPositioningElements(textRoot, lastCharacterWasSpace);
if (!m_textLength)
return;
buildCharacterDataMap(textRoot);
}
m_metricsBuilder.buildMetricsAndLayoutAttributes(textRoot, &text, m_characterDataMap);
}
bool SVGTextLayoutAttributesBuilder::buildLayoutAttributesForForSubtree(RenderSVGText* textRoot)
{
ASSERT(textRoot);
m_characterDataMap.clear();
if (m_textPositions.isEmpty()) {
m_textLength = 0;
bool lastCharacterWasSpace = true;
collectTextPositioningElements(textRoot, lastCharacterWasSpace);
}
if (!m_textLength)
return false;
buildCharacterDataMap(textRoot);
m_metricsBuilder.buildMetricsAndLayoutAttributes(textRoot, 0, m_characterDataMap);
return true;
}
void SVGTextLayoutAttributesBuilder::rebuildMetricsForTextRenderer(RenderSVGInlineText* text)
{
ASSERT(text);
m_metricsBuilder.measureTextRenderer(text);
}
static inline void processRenderSVGInlineText(const RenderSVGInlineText& text, unsigned& atCharacter, bool& lastCharacterWasSpace)
{
if (text.style().whiteSpace() == PRE) {
atCharacter += text.textLength();
return;
}
for (unsigned textPosition = 0, textLength = text.textLength(); textPosition < textLength; ++textPosition) {
const UChar currentCharacter = text[textPosition];
if (currentCharacter == ' ' && lastCharacterWasSpace)
continue;
lastCharacterWasSpace = currentCharacter == ' ';
++atCharacter;
}
}
void SVGTextLayoutAttributesBuilder::collectTextPositioningElements(RenderObject* start, bool& lastCharacterWasSpace)
{
ASSERT(!start->isSVGText() || m_textPositions.isEmpty());
for (RenderObject* child = start->firstChildSlow(); child; child = child->nextSibling()) {
if (child->isSVGInlineText()) {
processRenderSVGInlineText(*toRenderSVGInlineText(child), m_textLength, lastCharacterWasSpace);
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, lastCharacterWasSpace);
if (!element)
continue;
TextPosition& position = m_textPositions[atPosition];
ASSERT(!position.length);
position.length = m_textLength - position.start;
}
}
void SVGTextLayoutAttributesBuilder::buildCharacterDataMap(RenderSVGText* textRoot)
{
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->value;
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]);
}
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->value, 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->value.rotate = lastRotation;
}
}
}