void SVGTextLayoutAttributesBuilder::buildLayoutScope(LayoutScope& scope, RenderObject* renderer, unsigned textContentStart, unsigned textContentLength) const
{
ASSERT(renderer);
ASSERT(renderer->style());
scope.textContentStart = textContentStart;
scope.textContentLength = textContentLength;
SVGTextPositioningElement* element = SVGTextPositioningElement::elementFromRenderer(renderer);
if (!element)
return;
SVGTextLayoutAttributes& attributes = scope.attributes;
extractFloatValuesFromSVGLengthList(element, element->x(), attributes.xValues(), textContentLength);
extractFloatValuesFromSVGLengthList(element, element->y(), attributes.yValues(), textContentLength);
extractFloatValuesFromSVGLengthList(element, element->dx(), attributes.dxValues(), textContentLength);
extractFloatValuesFromSVGLengthList(element, element->dy(), attributes.dyValues(), textContentLength);
extractFloatValuesFromSVGNumberList(element->rotate(), attributes.rotateValues(), textContentLength);
// The last rotation value spans the whole scope.
Vector<float>& rotateValues = attributes.rotateValues();
if (rotateValues.isEmpty())
return;
unsigned rotateValuesSize = rotateValues.size();
if (rotateValuesSize == textContentLength)
return;
float lastRotation = rotateValues.last();
rotateValues.resize(textContentLength);
for (unsigned i = rotateValuesSize; i < textContentLength; ++i)
rotateValues.at(i) = lastRotation;
}
static bool translateBox(InlineBox* box, int x, int y, bool topLevel)
{
if (box->object()->isText()) {
box->setXPos(box->xPos() + x);
box->setYPos(box->yPos() + y);
} else if (!box->object()->element()->hasTagName(aTag)) {
InlineFlowBox* flow = static_cast<InlineFlowBox*>(box);
SVGTextPositioningElement* text = static_cast<SVGTextPositioningElement*>(box->object()->element());
if (topLevel || !(text->x()->getFirst().value() || text->y()->getFirst().value() ||
text->dx()->getFirst().value() || text->dy()->getFirst().value())) {
box->setXPos(box->xPos() + x);
box->setYPos(box->yPos() + y);
for (InlineBox* curr = flow->firstChild(); curr; curr = curr->nextOnLine()) {
if (!translateBox(curr, x, y, false))
return false;
}
}
}
return true;
}
static int placePositionedBoxesHorizontally(InlineFlowBox* flow, int x, int& leftPosition, int& rightPosition, int& leftAlign, int& rightAlign, bool& needsWordSpacing, int xPos, bool positioned)
{
int mn = INT_MAX;
int mx = INT_MIN;
int amn = INT_MAX;
int amx = INT_MIN;
int startx = x;
bool seenPositionedElement = false;
flow->setXPos(x);
for (InlineBox* curr = flow->firstChild(); curr; curr = curr->nextOnLine()) {
if (curr->object()->isText()) {
mn = min(mn, x);
amn = min(amn, x);
InlineTextBox* text = static_cast<InlineTextBox*>(curr);
RenderText* rt = static_cast<RenderText*>(text->object());
if (rt->textLength()) {
if (needsWordSpacing && DeprecatedChar(rt->characters()[text->start()]).isSpace())
x += rt->style(flow->isFirstLineStyle())->font().wordSpacing();
needsWordSpacing = !DeprecatedChar(rt->characters()[text->end()]).isSpace();
}
text->setXPos(x);
x += text->width();
mx = max(mx, x);
amx = max(amx, x);
} else if (curr->object()->isInlineFlow()) {
InlineFlowBox* flow = static_cast<InlineFlowBox*>(curr);
if (flow->object()->element()->hasTagName(aTag)) {
x = placePositionedBoxesHorizontally(flow, x, mn, mx, amn, amx, needsWordSpacing, xPos, false);
} else {
SVGTextPositioningElement* text = static_cast<SVGTextPositioningElement*>(flow->object()->element());
x += (int)(text->dx()->getFirst().value());
if (text->x()->numberOfItems() > 0)
x = (int)(text->x()->getFirst().value() - xPos);
if (text->x()->numberOfItems() > 0 || text->y()->numberOfItems() > 0 ||
text->dx()->numberOfItems() > 0 || text->dy()->numberOfItems() > 0) {
seenPositionedElement = true;
needsWordSpacing = false;
int ignoreX, ignoreY;
x = placePositionedBoxesHorizontally(flow, x, mn, mx, ignoreX, ignoreY, needsWordSpacing, xPos, true);
} else if (seenPositionedElement) {
int ignoreX, ignoreY;
x = placePositionedBoxesHorizontally(flow, x, mn, mx, ignoreX, ignoreY, needsWordSpacing, xPos, false);
} else
x = placePositionedBoxesHorizontally(flow, x, mn, mx, amn, amx, needsWordSpacing, xPos, false);
}
}
}
if (mn > mx)
mn = mx = startx;
if (amn > amx)
amn = amx = startx;
int width = mx - mn;
flow->setWidth(width);
int awidth = amx - amn;
int dx = 0;
if (positioned) {
switch (flow->object()->style()->svgStyle()->textAnchor()) {
case TA_MIDDLE:
translateBox(flow, dx = -awidth / 2, 0, true);
break;
case TA_END:
translateBox(flow, dx = -awidth, 0, true);
break;
case TA_START:
default:
break;
}
if (dx) {
x += dx;
mn += dx;
mx += dx;
}
}
leftPosition = min(leftPosition, mn);
rightPosition = max(rightPosition, mx);
leftAlign = min(leftAlign, amn);
rightAlign = max(rightAlign, amx);
return x;
}