////////////////////////////////////////////////////////////////////////////////
// Create a 1-bit clip mask in the stencil buffer. 'devClipBounds' are in device
// (as opposed to canvas) coordinates
bool GrClipMaskManager::createStencilClipMask(GrRenderTarget* rt,
int32_t elementsGenID,
GrReducedClip::InitialState initialState,
const GrReducedClip::ElementList& elements,
const SkIRect& clipSpaceIBounds,
const SkIPoint& clipSpaceToStencilOffset) {
SkASSERT(rt);
GrStencilAttachment* stencilAttachment =
fDrawTarget->cmmAccess().resourceProvider()->attachStencilAttachment(rt);
if (nullptr == stencilAttachment) {
return false;
}
if (stencilAttachment->mustRenderClip(elementsGenID, clipSpaceIBounds, clipSpaceToStencilOffset)) {
stencilAttachment->setLastClip(elementsGenID, clipSpaceIBounds, clipSpaceToStencilOffset);
// Set the matrix so that rendered clip elements are transformed from clip to stencil space.
SkVector translate = {
SkIntToScalar(clipSpaceToStencilOffset.fX),
SkIntToScalar(clipSpaceToStencilOffset.fY)
};
SkMatrix viewMatrix;
viewMatrix.setTranslate(translate);
// We set the current clip to the bounds so that our recursive draws are scissored to them.
SkIRect stencilSpaceIBounds(clipSpaceIBounds);
stencilSpaceIBounds.offset(clipSpaceToStencilOffset);
GrClip clip(stencilSpaceIBounds);
int clipBit = stencilAttachment->bits();
SkASSERT((clipBit <= 16) && "Ganesh only handles 16b or smaller stencil buffers");
clipBit = (1 << (clipBit-1));
fDrawTarget->cmmAccess().clearStencilClip(stencilSpaceIBounds,
GrReducedClip::kAllIn_InitialState == initialState, rt);
// walk through each clip element and perform its set op
// with the existing clip.
for (GrReducedClip::ElementList::Iter iter(elements.headIter()); iter.get(); iter.next()) {
const Element* element = iter.get();
GrPipelineBuilder pipelineBuilder;
pipelineBuilder.setClip(clip);
pipelineBuilder.setRenderTarget(rt);
pipelineBuilder.setDisableColorXPFactory();
// if the target is MSAA then we want MSAA enabled when the clip is soft
if (rt->isStencilBufferMultisampled()) {
pipelineBuilder.setState(GrPipelineBuilder::kHWAntialias_Flag, element->isAA());
}
bool fillInverted = false;
// enabled at bottom of loop
fClipMode = kIgnoreClip_StencilClipMode;
// This will be used to determine whether the clip shape can be rendered into the
// stencil with arbitrary stencil settings.
GrPathRenderer::StencilSupport stencilSupport;
GrStrokeInfo stroke(SkStrokeRec::kFill_InitStyle);
SkRegion::Op op = element->getOp();
GrPathRenderer* pr = nullptr;
SkPath clipPath;
if (Element::kRect_Type == element->getType()) {
stencilSupport = GrPathRenderer::kNoRestriction_StencilSupport;
fillInverted = false;
} else {
element->asPath(&clipPath);
fillInverted = clipPath.isInverseFillType();
if (fillInverted) {
clipPath.toggleInverseFillType();
}
pr = this->getContext()->getPathRenderer(fDrawTarget,
&pipelineBuilder,
viewMatrix,
clipPath,
stroke,
false,
GrPathRendererChain::kStencilOnly_DrawType,
&stencilSupport);
if (nullptr == pr) {
return false;
}
}
int passes;
GrStencilSettings stencilSettings[GrStencilSettings::kMaxStencilClipPasses];
bool canRenderDirectToStencil =
GrPathRenderer::kNoRestriction_StencilSupport == stencilSupport;
bool canDrawDirectToClip; // Given the renderer, the element,
// fill rule, and set operation can
// we render the element directly to
// stencil bit used for clipping.
canDrawDirectToClip = GrStencilSettings::GetClipPasses(op,
canRenderDirectToStencil,
clipBit,
fillInverted,
&passes,
stencilSettings);
// draw the element to the client stencil bits if necessary
if (!canDrawDirectToClip) {
GR_STATIC_CONST_SAME_STENCIL(gDrawToStencil,
kIncClamp_StencilOp,
kIncClamp_StencilOp,
kAlways_StencilFunc,
0xffff,
0x0000,
0xffff);
if (Element::kRect_Type == element->getType()) {
*pipelineBuilder.stencil() = gDrawToStencil;
// We need this AGP until everything is in GrBatch
fDrawTarget->drawNonAARect(pipelineBuilder,
GrColor_WHITE,
viewMatrix,
element->getRect());
} else {
if (!clipPath.isEmpty()) {
if (canRenderDirectToStencil) {
*pipelineBuilder.stencil() = gDrawToStencil;
GrPathRenderer::DrawPathArgs args;
args.fTarget = fDrawTarget;
args.fResourceProvider = this->getContext()->resourceProvider();
args.fPipelineBuilder = &pipelineBuilder;
args.fColor = GrColor_WHITE;
args.fViewMatrix = &viewMatrix;
args.fPath = &clipPath;
args.fStroke = &stroke;
args.fAntiAlias = false;
pr->drawPath(args);
} else {
GrPathRenderer::StencilPathArgs args;
args.fTarget = fDrawTarget;
args.fResourceProvider = this->getContext()->resourceProvider();
args.fPipelineBuilder = &pipelineBuilder;
args.fViewMatrix = &viewMatrix;
args.fPath = &clipPath;
args.fStroke = &stroke;
pr->stencilPath(args);
}
}
}
}
// now we modify the clip bit by rendering either the clip
// element directly or a bounding rect of the entire clip.
fClipMode = kModifyClip_StencilClipMode;
for (int p = 0; p < passes; ++p) {
*pipelineBuilder.stencil() = stencilSettings[p];
if (canDrawDirectToClip) {
if (Element::kRect_Type == element->getType()) {
// We need this AGP until everything is in GrBatch
fDrawTarget->drawNonAARect(pipelineBuilder,
GrColor_WHITE,
viewMatrix,
element->getRect());
} else {
GrPathRenderer::DrawPathArgs args;
args.fTarget = fDrawTarget;
args.fResourceProvider = this->getContext()->resourceProvider();
args.fPipelineBuilder = &pipelineBuilder;
args.fColor = GrColor_WHITE;
args.fViewMatrix = &viewMatrix;
args.fPath = &clipPath;
args.fStroke = &stroke;
args.fAntiAlias = false;
pr->drawPath(args);
}
} else {
// The view matrix is setup to do clip space -> stencil space translation, so
// draw rect in clip space.
fDrawTarget->drawNonAARect(pipelineBuilder,
GrColor_WHITE,
viewMatrix,
SkRect::Make(clipSpaceIBounds));
}
}
}
}
fClipMode = kRespectClip_StencilClipMode;
return true;
}
