| |
| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "GrClipMaskManager.h" |
| #include "GrAAConvexPathRenderer.h" |
| #include "GrAAHairLinePathRenderer.h" |
| #include "GrAARectRenderer.h" |
| #include "GrDrawTargetCaps.h" |
| #include "GrGpu.h" |
| #include "GrPaint.h" |
| #include "GrPathRenderer.h" |
| #include "GrRenderTarget.h" |
| #include "GrStencilBuffer.h" |
| #include "GrSWMaskHelper.h" |
| #include "effects/GrTextureDomainEffect.h" |
| #include "SkRasterClip.h" |
| #include "SkStrokeRec.h" |
| #include "SkTLazy.h" |
| |
| #define GR_AA_CLIP 1 |
| |
| typedef SkClipStack::Element Element; |
| |
| using namespace GrReducedClip; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| namespace { |
| // set up the draw state to enable the aa clipping mask. Besides setting up the |
| // stage matrix this also alters the vertex layout |
| void setup_drawstate_aaclip(GrGpu* gpu, |
| GrTexture* result, |
| const SkIRect &devBound) { |
| GrDrawState* drawState = gpu->drawState(); |
| SkASSERT(drawState); |
| |
| SkMatrix mat; |
| // We want to use device coords to compute the texture coordinates. We set our matrix to be |
| // equal to the view matrix followed by an offset to the devBound, and then a scaling matrix to |
| // normalized coords. We apply this matrix to the vertex positions rather than local coords. |
| mat.setIDiv(result->width(), result->height()); |
| mat.preTranslate(SkIntToScalar(-devBound.fLeft), |
| SkIntToScalar(-devBound.fTop)); |
| mat.preConcat(drawState->getViewMatrix()); |
| |
| SkIRect domainTexels = SkIRect::MakeWH(devBound.width(), devBound.height()); |
| // This could be a long-lived effect that is cached with the alpha-mask. |
| drawState->addCoverageEffect( |
| GrTextureDomainEffect::Create(result, |
| mat, |
| GrTextureDomainEffect::MakeTexelDomain(result, domainTexels), |
| GrTextureDomainEffect::kDecal_WrapMode, |
| GrTextureParams::kNone_FilterMode, |
| kPosition_GrCoordSet))->unref(); |
| } |
| |
| bool path_needs_SW_renderer(GrContext* context, |
| GrGpu* gpu, |
| const SkPath& origPath, |
| const SkStrokeRec& stroke, |
| bool doAA) { |
| // the gpu alpha mask will draw the inverse paths as non-inverse to a temp buffer |
| SkTCopyOnFirstWrite<SkPath> path(origPath); |
| if (path->isInverseFillType()) { |
| path.writable()->toggleInverseFillType(); |
| } |
| // last (false) parameter disallows use of the SW path renderer |
| GrPathRendererChain::DrawType type = doAA ? |
| GrPathRendererChain::kColorAntiAlias_DrawType : |
| GrPathRendererChain::kColor_DrawType; |
| |
| return NULL == context->getPathRenderer(*path, stroke, gpu, false, type); |
| } |
| |
| } |
| |
| /* |
| * 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(const 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. |
| SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle); |
| |
| for (ElementList::Iter iter(elements.headIter()); iter.get(); iter.next()) { |
| const Element* element = iter.get(); |
| // rects can always be drawn directly w/o using the software path |
| // so only paths need to be checked |
| if (Element::kPath_Type == element->getType() && |
| path_needs_SW_renderer(this->getContext(), fGpu, |
| element->getPath(), |
| stroke, |
| element->isAA())) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // sort out what kind of clip mask needs to be created: alpha, stencil, |
| // scissor, or entirely software |
| bool GrClipMaskManager::setupClipping(const GrClipData* clipDataIn, |
| GrDrawState::AutoRestoreEffects* are) { |
| fCurrClipMaskType = kNone_ClipMaskType; |
| |
| ElementList elements(16); |
| InitialState initialState; |
| SkIRect clipSpaceIBounds; |
| bool requiresAA; |
| bool isRect = false; |
| |
| GrDrawState* drawState = fGpu->drawState(); |
| |
| const GrRenderTarget* rt = drawState->getRenderTarget(); |
| // GrDrawTarget should have filtered this for us |
| SkASSERT(NULL != rt); |
| |
| bool ignoreClip = !drawState->isClipState() || clipDataIn->fClipStack->isWideOpen(); |
| |
| if (!ignoreClip) { |
| SkIRect clipSpaceRTIBounds = SkIRect::MakeWH(rt->width(), rt->height()); |
| clipSpaceRTIBounds.offset(clipDataIn->fOrigin); |
| ReduceClipStack(*clipDataIn->fClipStack, |
| clipSpaceRTIBounds, |
| &elements, |
| &initialState, |
| &clipSpaceIBounds, |
| &requiresAA); |
| if (elements.isEmpty()) { |
| if (kAllIn_InitialState == initialState) { |
| ignoreClip = clipSpaceIBounds == clipSpaceRTIBounds; |
| isRect = true; |
| } else { |
| return false; |
| } |
| } |
| } |
| |
| if (ignoreClip) { |
| fGpu->disableScissor(); |
| this->setGpuStencil(); |
| return true; |
| } |
| |
| #if GR_AA_CLIP |
| // TODO: catch isRect && requiresAA and use clip planes if available rather than a mask. |
| |
| // If MSAA is enabled we can do everything in the stencil buffer. |
| if (0 == rt->numSamples() && requiresAA) { |
| int32_t genID = clipDataIn->fClipStack->getTopmostGenID(); |
| GrTexture* result = NULL; |
| |
| if (this->useSWOnlyPath(elements)) { |
| // The clip geometry is complex enough that it will be more efficient to create it |
| // entirely in software |
| result = this->createSoftwareClipMask(genID, |
| initialState, |
| elements, |
| clipSpaceIBounds); |
| } else { |
| result = this->createAlphaClipMask(genID, |
| initialState, |
| elements, |
| clipSpaceIBounds); |
| } |
| |
| if (NULL != result) { |
| // The mask's top left coord should be pinned to the rounded-out top left corner of |
| // clipSpace bounds. We determine the mask's position WRT to the render target here. |
| SkIRect rtSpaceMaskBounds = clipSpaceIBounds; |
| rtSpaceMaskBounds.offset(-clipDataIn->fOrigin); |
| are->set(fGpu->drawState()); |
| setup_drawstate_aaclip(fGpu, result, rtSpaceMaskBounds); |
| fGpu->disableScissor(); |
| this->setGpuStencil(); |
| return true; |
| } |
| // if alpha clip mask creation fails fall through to the non-AA code paths |
| } |
| #endif // GR_AA_CLIP |
| |
| // Either a hard (stencil buffer) clip was explicitly requested or an anti-aliased clip couldn't |
| // be created. In either case, free up the texture in the anti-aliased mask cache. |
| // TODO: this may require more investigation. Ganesh performs a lot of utility draws (e.g., |
| // clears, InOrderDrawBuffer playbacks) that hit the stencil buffer path. These may be |
| // "incorrectly" clearing the AA cache. |
| fAACache.reset(); |
| |
| // If the clip is a rectangle then just set the scissor. Otherwise, create |
| // a stencil mask. |
| if (isRect) { |
| SkIRect clipRect = clipSpaceIBounds; |
| clipRect.offset(-clipDataIn->fOrigin); |
| fGpu->enableScissor(clipRect); |
| this->setGpuStencil(); |
| return true; |
| } |
| |
| // use the stencil clip if we can't represent the clip as a rectangle. |
| SkIPoint clipSpaceToStencilSpaceOffset = -clipDataIn->fOrigin; |
| this->createStencilClipMask(initialState, |
| elements, |
| clipSpaceIBounds, |
| clipSpaceToStencilSpaceOffset); |
| |
| // This must occur after createStencilClipMask. That function may change the scissor. Also, it |
| // only guarantees that the stencil mask is correct within the bounds it was passed, so we must |
| // use both stencil and scissor test to the bounds for the final draw. |
| SkIRect scissorSpaceIBounds(clipSpaceIBounds); |
| scissorSpaceIBounds.offset(clipSpaceToStencilSpaceOffset); |
| fGpu->enableScissor(scissorSpaceIBounds); |
| this->setGpuStencil(); |
| return true; |
| } |
| |
| #define VISUALIZE_COMPLEX_CLIP 0 |
| |
| #if VISUALIZE_COMPLEX_CLIP |
| #include "SkRandom.h" |
| SkRandom gRandom; |
| #define SET_RANDOM_COLOR drawState->setColor(0xff000000 | gRandom.nextU()); |
| #else |
| #define SET_RANDOM_COLOR |
| #endif |
| |
| namespace { |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // set up the OpenGL blend function to perform the specified |
| // boolean operation for alpha clip mask creation |
| void setup_boolean_blendcoeffs(GrDrawState* drawState, SkRegion::Op op) { |
| |
| switch (op) { |
| case SkRegion::kReplace_Op: |
| drawState->setBlendFunc(kOne_GrBlendCoeff, kZero_GrBlendCoeff); |
| break; |
| case SkRegion::kIntersect_Op: |
| drawState->setBlendFunc(kDC_GrBlendCoeff, kZero_GrBlendCoeff); |
| break; |
| case SkRegion::kUnion_Op: |
| drawState->setBlendFunc(kOne_GrBlendCoeff, kISC_GrBlendCoeff); |
| break; |
| case SkRegion::kXOR_Op: |
| drawState->setBlendFunc(kIDC_GrBlendCoeff, kISC_GrBlendCoeff); |
| break; |
| case SkRegion::kDifference_Op: |
| drawState->setBlendFunc(kZero_GrBlendCoeff, kISC_GrBlendCoeff); |
| break; |
| case SkRegion::kReverseDifference_Op: |
| drawState->setBlendFunc(kIDC_GrBlendCoeff, kZero_GrBlendCoeff); |
| break; |
| default: |
| SkASSERT(false); |
| break; |
| } |
| } |
| |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool GrClipMaskManager::drawElement(GrTexture* target, |
| const SkClipStack::Element* element, |
| GrPathRenderer* pr) { |
| GrDrawState* drawState = fGpu->drawState(); |
| |
| drawState->setRenderTarget(target->asRenderTarget()); |
| |
| switch (element->getType()) { |
| case Element::kRect_Type: |
| // TODO: Do rects directly to the accumulator using a aa-rect GrEffect that covers the |
| // entire mask bounds and writes 0 outside the rect. |
| if (element->isAA()) { |
| getContext()->getAARectRenderer()->fillAARect(fGpu, |
| fGpu, |
| element->getRect(), |
| SkMatrix::I(), |
| element->getRect(), |
| false); |
| } else { |
| fGpu->drawSimpleRect(element->getRect(), NULL); |
| } |
| return true; |
| case Element::kPath_Type: { |
| SkTCopyOnFirstWrite<SkPath> path(element->getPath()); |
| if (path->isInverseFillType()) { |
| path.writable()->toggleInverseFillType(); |
| } |
| SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle); |
| if (NULL == pr) { |
| GrPathRendererChain::DrawType type; |
| type = element->isAA() ? GrPathRendererChain::kColorAntiAlias_DrawType : |
| GrPathRendererChain::kColor_DrawType; |
| pr = this->getContext()->getPathRenderer(*path, stroke, fGpu, false, type); |
| } |
| if (NULL == pr) { |
| return false; |
| } |
| pr->drawPath(element->getPath(), stroke, fGpu, element->isAA()); |
| break; |
| } |
| default: |
| // something is wrong if we're trying to draw an empty element. |
| GrCrash("Unexpected element type"); |
| return false; |
| } |
| return true; |
| } |
| |
| bool GrClipMaskManager::canStencilAndDrawElement(GrTexture* target, |
| const SkClipStack::Element* element, |
| GrPathRenderer** pr) { |
| GrDrawState* drawState = fGpu->drawState(); |
| drawState->setRenderTarget(target->asRenderTarget()); |
| |
| switch (element->getType()) { |
| case Element::kRect_Type: |
| return true; |
| case Element::kPath_Type: { |
| SkTCopyOnFirstWrite<SkPath> path(element->getPath()); |
| if (path->isInverseFillType()) { |
| path.writable()->toggleInverseFillType(); |
| } |
| SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle); |
| GrPathRendererChain::DrawType type = element->isAA() ? |
| GrPathRendererChain::kStencilAndColorAntiAlias_DrawType : |
| GrPathRendererChain::kStencilAndColor_DrawType; |
| *pr = this->getContext()->getPathRenderer(*path, stroke, fGpu, false, type); |
| return NULL != *pr; |
| } |
| default: |
| // something is wrong if we're trying to draw an empty element. |
| GrCrash("Unexpected element type"); |
| return false; |
| } |
| } |
| |
| void GrClipMaskManager::mergeMask(GrTexture* dstMask, |
| GrTexture* srcMask, |
| SkRegion::Op op, |
| const SkIRect& dstBound, |
| const SkIRect& srcBound) { |
| GrDrawState::AutoViewMatrixRestore avmr; |
| GrDrawState* drawState = fGpu->drawState(); |
| SkAssertResult(avmr.setIdentity(drawState)); |
| GrDrawState::AutoRestoreEffects are(drawState); |
| |
| drawState->setRenderTarget(dstMask->asRenderTarget()); |
| |
| setup_boolean_blendcoeffs(drawState, op); |
| |
| SkMatrix sampleM; |
| sampleM.setIDiv(srcMask->width(), srcMask->height()); |
| |
| drawState->addColorEffect( |
| GrTextureDomainEffect::Create(srcMask, |
| sampleM, |
| GrTextureDomainEffect::MakeTexelDomain(srcMask, srcBound), |
| GrTextureDomainEffect::kDecal_WrapMode, |
| GrTextureParams::kNone_FilterMode))->unref(); |
| fGpu->drawSimpleRect(SkRect::MakeFromIRect(dstBound), NULL); |
| } |
| |
| // get a texture to act as a temporary buffer for AA clip boolean operations |
| // TODO: given the expense of createTexture we may want to just cache this too |
| void GrClipMaskManager::getTemp(int width, int height, GrAutoScratchTexture* temp) { |
| if (NULL != temp->texture()) { |
| // we've already allocated the temp texture |
| return; |
| } |
| |
| GrTextureDesc desc; |
| desc.fFlags = kRenderTarget_GrTextureFlagBit|kNoStencil_GrTextureFlagBit; |
| desc.fWidth = width; |
| desc.fHeight = height; |
| desc.fConfig = kAlpha_8_GrPixelConfig; |
| |
| temp->set(this->getContext(), desc); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Handles caching & allocation (if needed) of a clip alpha-mask texture for both the sw-upload |
| // or gpu-rendered cases. Returns true if there is no more work to be done (i.e., we got a cache |
| // hit) |
| bool GrClipMaskManager::getMaskTexture(int32_t clipStackGenID, |
| const SkIRect& clipSpaceIBounds, |
| GrTexture** result, |
| bool willUpload) { |
| bool cached = fAACache.canReuse(clipStackGenID, clipSpaceIBounds); |
| if (!cached) { |
| |
| // There isn't a suitable entry in the cache so we create a new texture to store the mask. |
| // Since we are setting up the cache we know the last lookup was a miss. Free up the |
| // currently cached mask so it can be reused. |
| fAACache.reset(); |
| |
| GrTextureDesc desc; |
| desc.fFlags = willUpload ? kNone_GrTextureFlags : kRenderTarget_GrTextureFlagBit; |
| desc.fWidth = clipSpaceIBounds.width(); |
| desc.fHeight = clipSpaceIBounds.height(); |
| desc.fConfig = kRGBA_8888_GrPixelConfig; |
| if (willUpload || this->getContext()->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) { |
| // We would always like A8 but it isn't supported on all platforms |
| desc.fConfig = kAlpha_8_GrPixelConfig; |
| } |
| |
| fAACache.acquireMask(clipStackGenID, desc, clipSpaceIBounds); |
| } |
| |
| *result = fAACache.getLastMask(); |
| return cached; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Create a 8-bit clip mask in alpha |
| GrTexture* GrClipMaskManager::createAlphaClipMask(int32_t clipStackGenID, |
| InitialState initialState, |
| const ElementList& elements, |
| const SkIRect& clipSpaceIBounds) { |
| SkASSERT(kNone_ClipMaskType == fCurrClipMaskType); |
| |
| GrTexture* result; |
| if (this->getMaskTexture(clipStackGenID, clipSpaceIBounds, &result, false)) { |
| fCurrClipMaskType = kAlpha_ClipMaskType; |
| return result; |
| } |
| |
| if (NULL == result) { |
| fAACache.reset(); |
| return NULL; |
| } |
| |
| // The top-left of the mask corresponds to the top-left corner of the bounds. |
| SkVector clipToMaskOffset = { |
| SkIntToScalar(-clipSpaceIBounds.fLeft), |
| SkIntToScalar(-clipSpaceIBounds.fTop) |
| }; |
| // The texture may be larger than necessary, this rect represents the part of the texture |
| // we populate with a rasterization of the clip. |
| SkIRect maskSpaceIBounds = SkIRect::MakeWH(clipSpaceIBounds.width(), clipSpaceIBounds.height()); |
| |
| // Set the matrix so that rendered clip elements are transformed to mask space from clip space. |
| SkMatrix translate; |
| translate.setTranslate(clipToMaskOffset); |
| GrDrawTarget::AutoGeometryAndStatePush agasp(fGpu, GrDrawTarget::kReset_ASRInit, &translate); |
| |
| GrDrawState* drawState = fGpu->drawState(); |
| |
| // We're drawing a coverage mask and want coverage to be run through the blend function. |
| drawState->enableState(GrDrawState::kCoverageDrawing_StateBit); |
| |
| // The scratch texture that we are drawing into can be substantially larger than the mask. Only |
| // clear the part that we care about. |
| fGpu->clear(&maskSpaceIBounds, |
| kAllIn_InitialState == initialState ? 0xffffffff : 0x00000000, |
| result->asRenderTarget()); |
| |
| // When we use the stencil in the below loop it is important to have this clip installed. |
| // The second pass that zeros the stencil buffer renders the rect maskSpaceIBounds so the first |
| // pass must not set values outside of this bounds or stencil values outside the rect won't be |
| // cleared. |
| GrDrawTarget::AutoClipRestore acr(fGpu, maskSpaceIBounds); |
| drawState->enableState(GrDrawState::kClip_StateBit); |
| |
| GrAutoScratchTexture temp; |
| // walk through each clip element and perform its set op |
| for (ElementList::Iter iter = elements.headIter(); iter.get(); iter.next()) { |
| const Element* element = iter.get(); |
| SkRegion::Op op = element->getOp(); |
| bool invert = element->isInverseFilled(); |
| |
| if (invert || SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op) { |
| GrPathRenderer* pr = NULL; |
| bool useTemp = !this->canStencilAndDrawElement(result, element, &pr); |
| GrTexture* dst; |
| // This is the bounds of the clip element in the space of the alpha-mask. The temporary |
| // mask buffer can be substantially larger than the actually clip stack element. We |
| // touch the minimum number of pixels necessary and use decal mode to combine it with |
| // the accumulator. |
| SkIRect maskSpaceElementIBounds; |
| |
| if (useTemp) { |
| if (invert) { |
| maskSpaceElementIBounds = maskSpaceIBounds; |
| } else { |
| SkRect elementBounds = element->getBounds(); |
| elementBounds.offset(clipToMaskOffset); |
| elementBounds.roundOut(&maskSpaceElementIBounds); |
| } |
| |
| this->getTemp(maskSpaceIBounds.fRight, maskSpaceIBounds.fBottom, &temp); |
| if (NULL == temp.texture()) { |
| fAACache.reset(); |
| return NULL; |
| } |
| dst = temp.texture(); |
| // clear the temp target and set blend to replace |
| fGpu->clear(&maskSpaceElementIBounds, |
| invert ? 0xffffffff : 0x00000000, |
| dst->asRenderTarget()); |
| setup_boolean_blendcoeffs(drawState, SkRegion::kReplace_Op); |
| |
| } else { |
| // draw directly into the result with the stencil set to make the pixels affected |
| // by the clip shape be non-zero. |
| dst = result; |
| GR_STATIC_CONST_SAME_STENCIL(kStencilInElement, |
| kReplace_StencilOp, |
| kReplace_StencilOp, |
| kAlways_StencilFunc, |
| 0xffff, |
| 0xffff, |
| 0xffff); |
| drawState->setStencil(kStencilInElement); |
| setup_boolean_blendcoeffs(drawState, op); |
| } |
| |
| drawState->setAlpha(invert ? 0x00 : 0xff); |
| |
| if (!this->drawElement(dst, element, pr)) { |
| fAACache.reset(); |
| return NULL; |
| } |
| |
| if (useTemp) { |
| // Now draw into the accumulator using the real operation and the temp buffer as a |
| // texture |
| this->mergeMask(result, |
| temp.texture(), |
| op, |
| maskSpaceIBounds, |
| maskSpaceElementIBounds); |
| } else { |
| // Draw to the exterior pixels (those with a zero stencil value). |
| drawState->setAlpha(invert ? 0xff : 0x00); |
| GR_STATIC_CONST_SAME_STENCIL(kDrawOutsideElement, |
| kZero_StencilOp, |
| kZero_StencilOp, |
| kEqual_StencilFunc, |
| 0xffff, |
| 0x0000, |
| 0xffff); |
| drawState->setStencil(kDrawOutsideElement); |
| fGpu->drawSimpleRect(clipSpaceIBounds); |
| drawState->disableStencil(); |
| } |
| } else { |
| // all the remaining ops can just be directly draw into the accumulation buffer |
| drawState->setAlpha(0xff); |
| setup_boolean_blendcoeffs(drawState, op); |
| this->drawElement(result, element); |
| } |
| } |
| |
| fCurrClipMaskType = kAlpha_ClipMaskType; |
| return result; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // 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) { |
| |
| SkASSERT(kNone_ClipMaskType == fCurrClipMaskType); |
| |
| GrDrawState* drawState = fGpu->drawState(); |
| SkASSERT(drawState->isClipState()); |
| |
| GrRenderTarget* rt = drawState->getRenderTarget(); |
| SkASSERT(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); |
| |
| // Set the matrix so that rendered clip elements are transformed from clip to stencil space. |
| SkVector translate = { |
| SkIntToScalar(clipSpaceToStencilOffset.fX), |
| SkIntToScalar(clipSpaceToStencilOffset.fY) |
| }; |
| SkMatrix matrix; |
| matrix.setTranslate(translate); |
| GrDrawTarget::AutoGeometryAndStatePush agasp(fGpu, GrDrawTarget::kReset_ASRInit, &matrix); |
| 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); |
| |
| #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 { |
| SkASSERT(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 { |
| SkASSERT(Element::kPath_Type == element->getType()); |
| if (!clipPath->isEmpty()) { |
| 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 { |
| SkASSERT(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); |
| } |
| } |
| } |
| } |
| // set this last because recursive draws may overwrite it back to kNone. |
| SkASSERT(kNone_ClipMaskType == fCurrClipMaskType); |
| fCurrClipMaskType = kStencil_ClipMaskType; |
| return true; |
| } |
| |
| |
| // mapping of clip-respecting stencil funcs to normal stencil funcs |
| // mapping depends on whether stencil-clipping is in effect. |
| static const GrStencilFunc |
| gSpecialToBasicStencilFunc[2][kClipStencilFuncCount] = { |
| {// Stencil-Clipping is DISABLED, we are effectively always inside the clip |
| // In the Clip Funcs |
| kAlways_StencilFunc, // kAlwaysIfInClip_StencilFunc |
| kEqual_StencilFunc, // kEqualIfInClip_StencilFunc |
| kLess_StencilFunc, // kLessIfInClip_StencilFunc |
| kLEqual_StencilFunc, // kLEqualIfInClip_StencilFunc |
| // Special in the clip func that forces user's ref to be 0. |
| kNotEqual_StencilFunc, // kNonZeroIfInClip_StencilFunc |
| // make ref 0 and do normal nequal. |
| }, |
| {// Stencil-Clipping is ENABLED |
| // In the Clip Funcs |
| kEqual_StencilFunc, // kAlwaysIfInClip_StencilFunc |
| // eq stencil clip bit, mask |
| // out user bits. |
| |
| kEqual_StencilFunc, // kEqualIfInClip_StencilFunc |
| // add stencil bit to mask and ref |
| |
| kLess_StencilFunc, // kLessIfInClip_StencilFunc |
| kLEqual_StencilFunc, // kLEqualIfInClip_StencilFunc |
| // for both of these we can add |
| // the clip bit to the mask and |
| // ref and compare as normal |
| // Special in the clip func that forces user's ref to be 0. |
| kLess_StencilFunc, // kNonZeroIfInClip_StencilFunc |
| // make ref have only the clip bit set |
| // and make comparison be less |
| // 10..0 < 1..user_bits.. |
| } |
| }; |
| |
| namespace { |
| // Sets the settings to clip against the stencil buffer clip while ignoring the |
| // client bits. |
| const GrStencilSettings& basic_apply_stencil_clip_settings() { |
| // stencil settings to use when clip is in stencil |
| GR_STATIC_CONST_SAME_STENCIL_STRUCT(gSettings, |
| kKeep_StencilOp, |
| kKeep_StencilOp, |
| kAlwaysIfInClip_StencilFunc, |
| 0x0000, |
| 0x0000, |
| 0x0000); |
| return *GR_CONST_STENCIL_SETTINGS_PTR_FROM_STRUCT_PTR(&gSettings); |
| } |
| } |
| |
| void GrClipMaskManager::setGpuStencil() { |
| // We make two copies of the StencilSettings here (except in the early |
| // exit scenario. One copy from draw state to the stack var. Then another |
| // from the stack var to the gpu. We could make this class hold a ptr to |
| // GrGpu's fStencilSettings and eliminate the stack copy here. |
| |
| const GrDrawState& drawState = fGpu->getDrawState(); |
| |
| // use stencil for clipping if clipping is enabled and the clip |
| // has been written into the stencil. |
| GrClipMaskManager::StencilClipMode clipMode; |
| if (this->isClipInStencil() && drawState.isClipState()) { |
| clipMode = GrClipMaskManager::kRespectClip_StencilClipMode; |
| // We can't be modifying the clip and respecting it at the same time. |
| SkASSERT(!drawState.isStateFlagEnabled( |
| GrGpu::kModifyStencilClip_StateBit)); |
| } else if (drawState.isStateFlagEnabled( |
| GrGpu::kModifyStencilClip_StateBit)) { |
| clipMode = GrClipMaskManager::kModifyClip_StencilClipMode; |
| } else { |
| clipMode = GrClipMaskManager::kIgnoreClip_StencilClipMode; |
| } |
| |
| GrStencilSettings settings; |
| // The GrGpu client may not be using the stencil buffer but we may need to |
| // enable it in order to respect a stencil clip. |
| if (drawState.getStencil().isDisabled()) { |
| if (GrClipMaskManager::kRespectClip_StencilClipMode == clipMode) { |
| settings = basic_apply_stencil_clip_settings(); |
| } else { |
| fGpu->disableStencil(); |
| return; |
| } |
| } else { |
| settings = drawState.getStencil(); |
| } |
| |
| // TODO: dynamically attach a stencil buffer |
| int stencilBits = 0; |
| GrStencilBuffer* stencilBuffer = |
| drawState.getRenderTarget()->getStencilBuffer(); |
| if (NULL != stencilBuffer) { |
| stencilBits = stencilBuffer->bits(); |
| } |
| |
| SkASSERT(fGpu->caps()->stencilWrapOpsSupport() || !settings.usesWrapOp()); |
| SkASSERT(fGpu->caps()->twoSidedStencilSupport() || !settings.isTwoSided()); |
| this->adjustStencilParams(&settings, clipMode, stencilBits); |
| fGpu->setStencilSettings(settings); |
| } |
| |
| void GrClipMaskManager::adjustStencilParams(GrStencilSettings* settings, |
| StencilClipMode mode, |
| int stencilBitCnt) { |
| SkASSERT(stencilBitCnt > 0); |
| |
| if (kModifyClip_StencilClipMode == mode) { |
| // We assume that this clip manager itself is drawing to the GrGpu and |
| // has already setup the correct values. |
| return; |
| } |
| |
| unsigned int clipBit = (1 << (stencilBitCnt - 1)); |
| unsigned int userBits = clipBit - 1; |
| |
| GrStencilSettings::Face face = GrStencilSettings::kFront_Face; |
| bool twoSided = fGpu->caps()->twoSidedStencilSupport(); |
| |
| bool finished = false; |
| while (!finished) { |
| GrStencilFunc func = settings->func(face); |
| uint16_t writeMask = settings->writeMask(face); |
| uint16_t funcMask = settings->funcMask(face); |
| uint16_t funcRef = settings->funcRef(face); |
| |
| SkASSERT((unsigned) func < kStencilFuncCount); |
| |
| writeMask &= userBits; |
| |
| if (func >= kBasicStencilFuncCount) { |
| int respectClip = kRespectClip_StencilClipMode == mode; |
| if (respectClip) { |
| // The GrGpu class should have checked this |
| SkASSERT(this->isClipInStencil()); |
| switch (func) { |
| case kAlwaysIfInClip_StencilFunc: |
| funcMask = clipBit; |
| funcRef = clipBit; |
| break; |
| case kEqualIfInClip_StencilFunc: |
| case kLessIfInClip_StencilFunc: |
| case kLEqualIfInClip_StencilFunc: |
| funcMask = (funcMask & userBits) | clipBit; |
| funcRef = (funcRef & userBits) | clipBit; |
| break; |
| case kNonZeroIfInClip_StencilFunc: |
| funcMask = (funcMask & userBits) | clipBit; |
| funcRef = clipBit; |
| break; |
| default: |
| GrCrash("Unknown stencil func"); |
| } |
| } else { |
| funcMask &= userBits; |
| funcRef &= userBits; |
| } |
| const GrStencilFunc* table = |
| gSpecialToBasicStencilFunc[respectClip]; |
| func = table[func - kBasicStencilFuncCount]; |
| SkASSERT(func >= 0 && func < kBasicStencilFuncCount); |
| } else { |
| funcMask &= userBits; |
| funcRef &= userBits; |
| } |
| |
| settings->setFunc(face, func); |
| settings->setWriteMask(face, writeMask); |
| settings->setFuncMask(face, funcMask); |
| settings->setFuncRef(face, funcRef); |
| |
| if (GrStencilSettings::kFront_Face == face) { |
| face = GrStencilSettings::kBack_Face; |
| finished = !twoSided; |
| } else { |
| finished = true; |
| } |
| } |
| if (!twoSided) { |
| settings->copyFrontSettingsToBack(); |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| GrTexture* GrClipMaskManager::createSoftwareClipMask(int32_t clipStackGenID, |
| GrReducedClip::InitialState initialState, |
| const GrReducedClip::ElementList& elements, |
| const SkIRect& clipSpaceIBounds) { |
| SkASSERT(kNone_ClipMaskType == fCurrClipMaskType); |
| |
| GrTexture* result; |
| if (this->getMaskTexture(clipStackGenID, clipSpaceIBounds, &result, true)) { |
| return result; |
| } |
| |
| if (NULL == result) { |
| fAACache.reset(); |
| return NULL; |
| } |
| |
| // The mask texture may be larger than necessary. We round out the clip space bounds and pin |
| // the top left corner of the resulting rect to the top left of the texture. |
| SkIRect maskSpaceIBounds = SkIRect::MakeWH(clipSpaceIBounds.width(), clipSpaceIBounds.height()); |
| |
| GrSWMaskHelper helper(this->getContext()); |
| |
| SkMatrix matrix; |
| matrix.setTranslate(SkIntToScalar(-clipSpaceIBounds.fLeft), |
| SkIntToScalar(-clipSpaceIBounds.fTop)); |
| helper.init(maskSpaceIBounds, &matrix); |
| |
| helper.clear(kAllIn_InitialState == initialState ? 0xFF : 0x00); |
| |
| SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle); |
| |
| for (ElementList::Iter iter(elements.headIter()) ; NULL != iter.get(); iter.next()) { |
| |
| const Element* element = iter.get(); |
| SkRegion::Op op = element->getOp(); |
| |
| if (SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op) { |
| // Intersect and reverse difference require modifying pixels outside of the geometry |
| // that is being "drawn". In both cases we erase all the pixels outside of the geometry |
| // but leave the pixels inside the geometry alone. For reverse difference we invert all |
| // the pixels before clearing the ones outside the geometry. |
| if (SkRegion::kReverseDifference_Op == op) { |
| SkRect temp = SkRect::MakeFromIRect(clipSpaceIBounds); |
| // invert the entire scene |
| helper.draw(temp, SkRegion::kXOR_Op, false, 0xFF); |
| } |
| |
| if (Element::kRect_Type == element->getType()) { |
| // convert the rect to a path so we can invert the fill |
| SkPath temp; |
| temp.addRect(element->getRect()); |
| temp.setFillType(SkPath::kInverseEvenOdd_FillType); |
| |
| helper.draw(temp, stroke, SkRegion::kReplace_Op, |
| element->isAA(), |
| 0x00); |
| } else { |
| SkASSERT(Element::kPath_Type == element->getType()); |
| SkPath clipPath = element->getPath(); |
| clipPath.toggleInverseFillType(); |
| helper.draw(clipPath, stroke, |
| SkRegion::kReplace_Op, |
| element->isAA(), |
| 0x00); |
| } |
| |
| continue; |
| } |
| |
| // The other ops (union, xor, diff) only affect pixels inside |
| // the geometry so they can just be drawn normally |
| if (Element::kRect_Type == element->getType()) { |
| helper.draw(element->getRect(), op, element->isAA(), 0xFF); |
| } else { |
| SkASSERT(Element::kPath_Type == element->getType()); |
| helper.draw(element->getPath(), stroke, op, element->isAA(), 0xFF); |
| } |
| } |
| |
| helper.toTexture(result); |
| |
| fCurrClipMaskType = kAlpha_ClipMaskType; |
| return result; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void GrClipMaskManager::releaseResources() { |
| fAACache.releaseResources(); |
| } |
| |
| void GrClipMaskManager::setGpu(GrGpu* gpu) { |
| fGpu = gpu; |
| fAACache.setContext(gpu->getContext()); |
| } |
| |
| void GrClipMaskManager::adjustPathStencilParams(GrStencilSettings* settings) { |
| const GrDrawState& drawState = fGpu->getDrawState(); |
| GrClipMaskManager::StencilClipMode clipMode; |
| if (this->isClipInStencil() && drawState.isClipState()) { |
| clipMode = GrClipMaskManager::kRespectClip_StencilClipMode; |
| // We can't be modifying the clip and respecting it at the same time. |
| SkASSERT(!drawState.isStateFlagEnabled( |
| GrGpu::kModifyStencilClip_StateBit)); |
| } else if (drawState.isStateFlagEnabled( |
| GrGpu::kModifyStencilClip_StateBit)) { |
| clipMode = GrClipMaskManager::kModifyClip_StencilClipMode; |
| } else { |
| clipMode = GrClipMaskManager::kIgnoreClip_StencilClipMode; |
| } |
| |
| // TODO: dynamically attach a stencil buffer |
| int stencilBits = 0; |
| GrStencilBuffer* stencilBuffer = |
| drawState.getRenderTarget()->getStencilBuffer(); |
| if (NULL != stencilBuffer) { |
| stencilBits = stencilBuffer->bits(); |
| this->adjustStencilParams(settings, clipMode, stencilBits); |
| } |
| } |