void Renderer::onContentSizeDirty() {
_isPageSplitted = false;
if (hasFlag(RenderFlag::PaginatedLayout)) {
Size s = _owner->getContentSize();
if (shouldSplitPages(s)) {
s.width /= 2.0f;
_isPageSplitted = true;
}
s.width -= _pageMargin.horizontal();
s.height -= _pageMargin.vertical();
setSurfaceSize(s);
} else {
setSurfaceSize(_owner->getContentSize());
}
}
void HTMLCanvasElement::reset()
{
if (m_ignoreReset)
return;
resetDirtyRect();
bool ok;
bool hadImageBuffer = hasImageBuffer();
int w = getAttribute(widthAttr).toInt(&ok);
if (!ok || w < 0)
w = DefaultWidth;
int h = getAttribute(heightAttr).toInt(&ok);
if (!ok || h < 0)
h = DefaultHeight;
if (m_contextStateSaver) {
// Reset to the initial graphics context state.
m_contextStateSaver->restore();
m_contextStateSaver->save();
}
if (m_context && m_context->is2d())
toCanvasRenderingContext2D(m_context.get())->reset();
IntSize oldSize = size();
IntSize newSize(w, h);
// If the size of an existing buffer matches, we can just clear it instead of reallocating.
// This optimization is only done for 2D canvases for now.
if (hadImageBuffer && oldSize == newSize && m_context && m_context->is2d()) {
if (!m_didClearImageBuffer)
clearImageBuffer();
return;
}
setSurfaceSize(newSize);
if (m_context && m_context->is3d() && oldSize != size())
toWebGLRenderingContext(m_context.get())->reshape(width(), height());
if (RenderObject* renderer = this->renderer()) {
if (renderer->isCanvas()) {
if (oldSize != size()) {
toRenderHTMLCanvas(renderer)->canvasSizeChanged();
if (renderBox() && renderBox()->hasAcceleratedCompositing())
renderBox()->contentChanged(CanvasChanged);
}
if (hadImageBuffer)
renderer->setShouldDoFullPaintInvalidation(true);
}
}
WillBeHeapHashSet<RawPtrWillBeWeakMember<CanvasObserver> >::iterator end = m_observers.end();
for (WillBeHeapHashSet<RawPtrWillBeWeakMember<CanvasObserver> >::iterator it = m_observers.begin(); it != end; ++it)
(*it)->canvasResized(this);
}