/*
* This method traverses the clip stack to see if the GrSoftwarePathRenderer
* will be used on any element. If so, it returns true to indicate that the
* entire clip should be rendered in SW and then uploaded en masse to the gpu.
*/
bool GrClipMaskManager::UseSWOnlyPath(GrContext* context,
const GrPipelineBuilder& pipelineBuilder,
const GrDrawContext* drawContext,
const SkVector& clipToMaskOffset,
const GrReducedClip::ElementList& elements) {
// TODO: generalize this function so that when
// a clip gets complex enough it can just be done in SW regardless
// of whether it would invoke the GrSoftwarePathRenderer.
// Set the matrix so that rendered clip elements are transformed to mask space from clip
// space.
const SkMatrix translate = SkMatrix::MakeTrans(clipToMaskOffset.fX, clipToMaskOffset.fY);
for (GrReducedClip::ElementList::Iter iter(elements.headIter()); iter.get(); iter.next()) {
const Element* element = iter.get();
SkRegion::Op op = element->getOp();
bool invert = element->isInverseFilled();
bool needsStencil = invert ||
SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op;
if (PathNeedsSWRenderer(context, pipelineBuilder.hasUserStencilSettings(),
drawContext, translate, element, nullptr, needsStencil)) {
return true;
}
}
return false;
}
// Determines whether it is possible to draw the element to both the stencil buffer and the
// alpha mask simultaneously. If so and the element is a path a compatible path renderer is
// also returned.
GrPathRenderer* GrClipMaskManager::GetPathRenderer(GrContext* context,
GrTexture* texture,
const SkMatrix& viewMatrix,
const SkClipStack::Element* element) {
GrPathRenderer* pr;
static const bool kNeedsStencil = true;
static const bool kStencilIsDisabled = true;
PathNeedsSWRenderer(context,
kStencilIsDisabled,
texture->asRenderTarget(),
viewMatrix,
element,
&pr,
kNeedsStencil);
return pr;
}
