////////////////////////////////////////////////////////////////////////////////
// Create a 1-bit clip mask in the stencil buffer. 'devClipBounds' are in device
// (as opposed to canvas) coordinates
bool GrClipMaskManager::createStencilClipMask(InitialState initialState,
const ElementList& elements,
const SkIRect& clipSpaceIBounds,
const SkIPoint& clipSpaceToStencilOffset) {
GrAssert(kNone_ClipMaskType == fCurrClipMaskType);
GrDrawState* drawState = fGpu->drawState();
GrAssert(drawState->isClipState());
GrRenderTarget* rt = drawState->getRenderTarget();
GrAssert(NULL != rt);
// TODO: dynamically attach a SB when needed.
GrStencilBuffer* stencilBuffer = rt->getStencilBuffer();
if (NULL == stencilBuffer) {
return false;
}
int32_t genID = elements.tail()->getGenID();
if (stencilBuffer->mustRenderClip(genID, clipSpaceIBounds, clipSpaceToStencilOffset)) {
stencilBuffer->setLastClip(genID, clipSpaceIBounds, clipSpaceToStencilOffset);
GrDrawTarget::AutoGeometryAndStatePush agasp(fGpu, GrDrawTarget::kReset_ASRInit);
drawState = fGpu->drawState();
drawState->setRenderTarget(rt);
// We set the current clip to the bounds so that our recursive draws are scissored to them.
SkIRect stencilSpaceIBounds(clipSpaceIBounds);
stencilSpaceIBounds.offset(clipSpaceToStencilOffset);
GrDrawTarget::AutoClipRestore acr(fGpu, stencilSpaceIBounds);
drawState->enableState(GrDrawState::kClip_StateBit);
// Set the matrix so that rendered clip elements are transformed from clip to stencil space.
SkVector translate = {
SkIntToScalar(clipSpaceToStencilOffset.fX),
SkIntToScalar(clipSpaceToStencilOffset.fY)
};
drawState->viewMatrix()->setTranslate(translate);
#if !VISUALIZE_COMPLEX_CLIP
drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
#endif
int clipBit = stencilBuffer->bits();
SkASSERT((clipBit <= 16) && "Ganesh only handles 16b or smaller stencil buffers");
clipBit = (1 << (clipBit-1));
fGpu->clearStencilClip(stencilSpaceIBounds, kAllIn_InitialState == initialState);
// walk through each clip element and perform its set op
// with the existing clip.
for (ElementList::Iter iter(elements.headIter()); NULL != iter.get(); iter.next()) {
const Element* element = iter.get();
bool fillInverted = false;
// enabled at bottom of loop
drawState->disableState(GrGpu::kModifyStencilClip_StateBit);
// if the target is MSAA then we want MSAA enabled when the clip is soft
if (rt->isMultisampled()) {
drawState->setState(GrDrawState::kHWAntialias_StateBit, element->isAA());
}
// This will be used to determine whether the clip shape can be rendered into the
// stencil with arbitrary stencil settings.
GrPathRenderer::StencilSupport stencilSupport;
SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
SkRegion::Op op = element->getOp();
GrPathRenderer* pr = NULL;
SkTCopyOnFirstWrite<SkPath> clipPath;
if (Element::kRect_Type == element->getType()) {
stencilSupport = GrPathRenderer::kNoRestriction_StencilSupport;
fillInverted = false;
} else {
GrAssert(Element::kPath_Type == element->getType());
clipPath.init(element->getPath());
fillInverted = clipPath->isInverseFillType();
if (fillInverted) {
clipPath.writable()->toggleInverseFillType();
}
pr = this->getContext()->getPathRenderer(*clipPath,
stroke,
fGpu,
false,
GrPathRendererChain::kStencilOnly_DrawType,
&stencilSupport);
if (NULL == 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);
SET_RANDOM_COLOR
if (Element::kRect_Type == element->getType()) {
*drawState->stencil() = gDrawToStencil;
fGpu->drawSimpleRect(element->getRect(), NULL);
} else {
GrAssert(Element::kPath_Type == element->getType());
if (canRenderDirectToStencil) {
*drawState->stencil() = gDrawToStencil;
pr->drawPath(*clipPath, stroke, fGpu, false);
} else {
pr->stencilPath(*clipPath, stroke, fGpu);
}
}
}
// now we modify the clip bit by rendering either the clip
// element directly or a bounding rect of the entire clip.
drawState->enableState(GrGpu::kModifyStencilClip_StateBit);
for (int p = 0; p < passes; ++p) {
*drawState->stencil() = stencilSettings[p];
if (canDrawDirectToClip) {
if (Element::kRect_Type == element->getType()) {
SET_RANDOM_COLOR
fGpu->drawSimpleRect(element->getRect(), NULL);
} else {
GrAssert(Element::kPath_Type == element->getType());
SET_RANDOM_COLOR
pr->drawPath(*clipPath, stroke, fGpu, false);
}
} else {
SET_RANDOM_COLOR
// The view matrix is setup to do clip space -> stencil space translation, so
// draw rect in clip space.
fGpu->drawSimpleRect(SkRect::MakeFromIRect(clipSpaceIBounds), NULL);
}
}
}
bool GrClipMaskManager::installClipEffects(const ElementList& elements,
GrDrawState::AutoRestoreEffects* are,
const SkVector& clipToRTOffset,
const SkRect* drawBounds) {
GrDrawState* drawState = fGpu->drawState();
SkRect boundsInClipSpace;
if (NULL != drawBounds) {
boundsInClipSpace = *drawBounds;
boundsInClipSpace.offset(-clipToRTOffset.fX, -clipToRTOffset.fY);
}
are->set(drawState);
GrRenderTarget* rt = drawState->getRenderTarget();
ElementList::Iter iter(elements);
bool setARE = false;
bool failed = false;
while (NULL != iter.get()) {
SkRegion::Op op = iter.get()->getOp();
bool invert;
bool skip = false;
switch (op) {
case SkRegion::kReplace_Op:
SkASSERT(iter.get() == elements.head());
// Fallthrough, handled same as intersect.
case SkRegion::kIntersect_Op:
invert = false;
if (NULL != drawBounds && iter.get()->contains(boundsInClipSpace)) {
skip = true;
}
break;
case SkRegion::kDifference_Op:
invert = true;
// We don't currently have a cheap test for whether a rect is fully outside an
// element's primitive, so don't attempt to set skip.
break;
default:
failed = true;
break;
}
if (failed) {
break;
}
if (!skip) {
GrEffectEdgeType edgeType;
if (GR_AA_CLIP && iter.get()->isAA()) {
if (rt->isMultisampled()) {
// Coverage based AA clips don't place nicely with MSAA.
failed = true;
break;
}
edgeType = invert ? kInverseFillAA_GrEffectEdgeType : kFillAA_GrEffectEdgeType;
} else {
edgeType = invert ? kInverseFillBW_GrEffectEdgeType : kFillBW_GrEffectEdgeType;
}
SkAutoTUnref<GrEffectRef> effect;
switch (iter.get()->getType()) {
case SkClipStack::Element::kPath_Type:
effect.reset(GrConvexPolyEffect::Create(edgeType, iter.get()->getPath(),
&clipToRTOffset));
break;
case SkClipStack::Element::kRRect_Type: {
SkRRect rrect = iter.get()->getRRect();
rrect.offset(clipToRTOffset.fX, clipToRTOffset.fY);
effect.reset(GrRRectEffect::Create(edgeType, rrect));
break;
}
case SkClipStack::Element::kRect_Type: {
SkRect rect = iter.get()->getRect();
rect.offset(clipToRTOffset.fX, clipToRTOffset.fY);
effect.reset(GrConvexPolyEffect::Create(edgeType, rect));
break;
}
default:
break;
}
if (effect) {
if (!setARE) {
are->set(fGpu->drawState());
setARE = true;
}
fGpu->drawState()->addCoverageEffect(effect);
} else {
failed = true;
break;
}
}
iter.next();
}
if (failed) {
are->set(NULL);
}
return !failed;
}
////////////////////////////////////////////////////////////////////////////////
// Create a 1-bit clip mask in the stencil buffer. 'devClipBounds' are in device
// (as opposed to canvas) coordinates
bool GrClipMaskManager::createStencilClipMask(const GrClipData& clipDataIn,
const GrIRect& devClipBounds) {
GrAssert(kNone_ClipMaskType == fCurrClipMaskType);
GrDrawState* drawState = fGpu->drawState();
GrAssert(drawState->isClipState());
GrRenderTarget* rt = drawState->getRenderTarget();
GrAssert(NULL != rt);
// TODO: dynamically attach a SB when needed.
GrStencilBuffer* stencilBuffer = rt->getStencilBuffer();
if (NULL == stencilBuffer) {
return false;
}
if (stencilBuffer->mustRenderClip(clipDataIn, rt->width(), rt->height())) {
stencilBuffer->setLastClip(clipDataIn, rt->width(), rt->height());
// we set the current clip to the bounds so that our recursive
// draws are scissored to them. We use the copy of the complex clip
// we just stashed on the SB to render from. We set it back after
// we finish drawing it into the stencil.
const GrClipData* oldClipData = fGpu->getClip();
// The origin of 'newClipData' is (0, 0) so it is okay to place
// a device-coordinate bound in 'newClipStack'
SkClipStack newClipStack(devClipBounds);
GrClipData newClipData;
newClipData.fClipStack = &newClipStack;
fGpu->setClip(&newClipData);
GrDrawTarget::AutoStateRestore asr(fGpu, GrDrawTarget::kReset_ASRInit);
drawState = fGpu->drawState();
drawState->setRenderTarget(rt);
GrDrawTarget::AutoGeometryPush agp(fGpu);
if (0 != clipDataIn.fOrigin.fX || 0 != clipDataIn.fOrigin.fY) {
// Add the saveLayer's offset to the view matrix rather than
// offset each individual draw
drawState->viewMatrix()->setTranslate(
SkIntToScalar(-clipDataIn.fOrigin.fX),
SkIntToScalar(-clipDataIn.fOrigin.fY));
}
#if !VISUALIZE_COMPLEX_CLIP
drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
#endif
int clipBit = stencilBuffer->bits();
SkASSERT((clipBit <= 16) &&
"Ganesh only handles 16b or smaller stencil buffers");
clipBit = (1 << (clipBit-1));
GrIRect devRTRect = GrIRect::MakeWH(rt->width(), rt->height());
bool clearToInside;
SkRegion::Op firstOp = SkRegion::kReplace_Op; // suppress warning
SkClipStack::Iter iter(*oldClipData->fClipStack,
SkClipStack::Iter::kBottom_IterStart);
const SkClipStack::Iter::Clip* clip = process_initial_clip_elements(&iter,
devRTRect,
&clearToInside,
&firstOp,
clipDataIn);
fGpu->clearStencilClip(devClipBounds, clearToInside);
bool first = true;
// walk through each clip element and perform its set op
// with the existing clip.
for ( ; NULL != clip; clip = iter.nextCombined()) {
GrPathFill fill;
bool fillInverted = false;
// enabled at bottom of loop
drawState->disableState(GrGpu::kModifyStencilClip_StateBit);
// if the target is MSAA then we want MSAA enabled when the clip is soft
if (rt->isMultisampled()) {
drawState->setState(GrDrawState::kHWAntialias_StateBit, clip->fDoAA);
}
// Can the clip element be drawn directly to the stencil buffer
// with a non-inverted fill rule without extra passes to
// resolve in/out status?
bool canRenderDirectToStencil = false;
SkRegion::Op op = clip->fOp;
if (first) {
first = false;
op = firstOp;
}
GrPathRenderer* pr = NULL;
const SkPath* clipPath = NULL;
if (NULL != clip->fRect) {
canRenderDirectToStencil = true;
fill = kEvenOdd_GrPathFill;
fillInverted = false;
// there is no point in intersecting a screen filling
// rectangle.
if (SkRegion::kIntersect_Op == op &&
contains(*clip->fRect, devRTRect, oldClipData->fOrigin)) {
continue;
}
} else {
GrAssert(NULL != clip->fPath);
fill = get_path_fill(*clip->fPath);
fillInverted = GrIsFillInverted(fill);
fill = GrNonInvertedFill(fill);
clipPath = clip->fPath;
pr = this->getContext()->getPathRenderer(*clipPath, fill, fGpu, false, true);
if (NULL == pr) {
fGpu->setClip(oldClipData);
return false;
}
canRenderDirectToStencil =
!pr->requiresStencilPass(*clipPath, fill, fGpu);
}
int passes;
GrStencilSettings stencilSettings[GrStencilSettings::kMaxStencilClipPasses];
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);
SET_RANDOM_COLOR
if (NULL != clip->fRect) {
*drawState->stencil() = gDrawToStencil;
fGpu->drawSimpleRect(*clip->fRect, NULL);
} else {
if (canRenderDirectToStencil) {
*drawState->stencil() = gDrawToStencil;
pr->drawPath(*clipPath, fill, fGpu, false);
} else {
pr->drawPathToStencil(*clipPath, fill, fGpu);
}
}
}
// now we modify the clip bit by rendering either the clip
// element directly or a bounding rect of the entire clip.
drawState->enableState(GrGpu::kModifyStencilClip_StateBit);
for (int p = 0; p < passes; ++p) {
*drawState->stencil() = stencilSettings[p];
if (canDrawDirectToClip) {
if (NULL != clip->fRect) {
SET_RANDOM_COLOR
fGpu->drawSimpleRect(*clip->fRect, NULL);
} else {
SET_RANDOM_COLOR
pr->drawPath(*clipPath, fill, fGpu, false);
}
} else {
SET_RANDOM_COLOR
// 'devClipBounds' is already in device coordinates so the
// translation in the view matrix is inappropriate.
// Convert it to canvas space so the drawn rect will
// be in the correct location
GrRect canvClipBounds;
canvClipBounds.set(devClipBounds);
device_to_canvas(&canvClipBounds, clipDataIn.fOrigin);
fGpu->drawSimpleRect(canvClipBounds, NULL);
}
}
}
bool GrClipMaskManager::installClipEffects(GrPipelineBuilder* pipelineBuilder,
GrPipelineBuilder::AutoRestoreFragmentProcessors* arfp,
const GrReducedClip::ElementList& elements,
const SkVector& clipToRTOffset,
const SkRect* drawBounds) {
SkRect boundsInClipSpace;
if (drawBounds) {
boundsInClipSpace = *drawBounds;
boundsInClipSpace.offset(-clipToRTOffset.fX, -clipToRTOffset.fY);
}
arfp->set(pipelineBuilder);
GrRenderTarget* rt = pipelineBuilder->getRenderTarget();
GrReducedClip::ElementList::Iter iter(elements);
bool failed = false;
while (iter.get()) {
SkRegion::Op op = iter.get()->getOp();
bool invert;
bool skip = false;
switch (op) {
case SkRegion::kReplace_Op:
SkASSERT(iter.get() == elements.head());
// Fallthrough, handled same as intersect.
case SkRegion::kIntersect_Op:
invert = false;
if (drawBounds && iter.get()->contains(boundsInClipSpace)) {
skip = true;
}
break;
case SkRegion::kDifference_Op:
invert = true;
// We don't currently have a cheap test for whether a rect is fully outside an
// element's primitive, so don't attempt to set skip.
break;
default:
failed = true;
break;
}
if (failed) {
break;
}
if (!skip) {
GrPrimitiveEdgeType edgeType;
if (iter.get()->isAA()) {
if (rt->isMultisampled()) {
// Coverage based AA clips don't place nicely with MSAA.
failed = true;
break;
}
edgeType =
invert ? kInverseFillAA_GrProcessorEdgeType : kFillAA_GrProcessorEdgeType;
} else {
edgeType =
invert ? kInverseFillBW_GrProcessorEdgeType : kFillBW_GrProcessorEdgeType;
}
SkAutoTUnref<GrFragmentProcessor> fp;
switch (iter.get()->getType()) {
case SkClipStack::Element::kPath_Type:
fp.reset(GrConvexPolyEffect::Create(edgeType, iter.get()->getPath(),
&clipToRTOffset));
break;
case SkClipStack::Element::kRRect_Type: {
SkRRect rrect = iter.get()->getRRect();
rrect.offset(clipToRTOffset.fX, clipToRTOffset.fY);
fp.reset(GrRRectEffect::Create(edgeType, rrect));
break;
}
case SkClipStack::Element::kRect_Type: {
SkRect rect = iter.get()->getRect();
rect.offset(clipToRTOffset.fX, clipToRTOffset.fY);
fp.reset(GrConvexPolyEffect::Create(edgeType, rect));
break;
}
default:
break;
}
if (fp) {
pipelineBuilder->addCoverageProcessor(fp);
} else {
failed = true;
break;
}
}
iter.next();
}
if (failed) {
arfp->set(NULL);
}
return !failed;
}
