| |
| /* |
| * 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 "GrGpu.h" |
| #include "GrRenderTarget.h" |
| #include "GrStencilBuffer.h" |
| #include "GrPathRenderer.h" |
| #include "GrPaint.h" |
| #include "SkRasterClip.h" |
| #include "GrAAConvexPathRenderer.h" |
| #include "GrAAHairLinePathRenderer.h" |
| #include "GrSWMaskHelper.h" |
| #include "GrCacheID.h" |
| |
| GR_DEFINE_RESOURCE_CACHE_DOMAIN(GrClipMaskManager, GetAlphaMaskDomain) |
| |
| #define GR_AA_CLIP 1 |
| #define GR_SW_CLIP 1 |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| namespace { |
| // set up the draw state to enable the aa clipping mask. Besides setting up the |
| // sampler matrix this also alters the vertex layout |
| void setup_drawstate_aaclip(GrGpu* gpu, |
| GrTexture* result, |
| const GrIRect &devBound) { |
| GrDrawState* drawState = gpu->drawState(); |
| GrAssert(drawState); |
| |
| static const int kMaskStage = GrPaint::kTotalStages+1; |
| |
| GrMatrix mat; |
| mat.setIDiv(result->width(), result->height()); |
| mat.preTranslate(SkIntToScalar(-devBound.fLeft), |
| SkIntToScalar(-devBound.fTop)); |
| mat.preConcat(drawState->getViewMatrix()); |
| |
| drawState->sampler(kMaskStage)->reset(); |
| drawState->createTextureEffect(kMaskStage, result, mat); |
| } |
| |
| bool path_needs_SW_renderer(GrContext* context, |
| GrGpu* gpu, |
| const SkPath& path, |
| GrPathFill fill, |
| bool doAA) { |
| // last (false) parameter disallows use of the SW path renderer |
| return NULL == context->getPathRenderer(path, fill, gpu, doAA, false); |
| } |
| |
| GrPathFill get_path_fill(const SkPath& path) { |
| switch (path.getFillType()) { |
| case SkPath::kWinding_FillType: |
| return kWinding_GrPathFill; |
| case SkPath::kEvenOdd_FillType: |
| return kEvenOdd_GrPathFill; |
| case SkPath::kInverseWinding_FillType: |
| return kInverseWinding_GrPathFill; |
| case SkPath::kInverseEvenOdd_FillType: |
| return kInverseEvenOdd_GrPathFill; |
| default: |
| GrCrash("Unsupported path fill in clip."); |
| return kWinding_GrPathFill; // suppress warning |
| } |
| } |
| |
| /** |
| * Does any individual clip in 'clipIn' use anti-aliasing? |
| */ |
| bool requires_AA(const SkClipStack& clipIn) { |
| |
| SkClipStack::Iter iter; |
| iter.reset(clipIn, SkClipStack::Iter::kBottom_IterStart); |
| |
| const SkClipStack::Iter::Clip* clip = NULL; |
| for (clip = iter.skipToTopmost(SkRegion::kReplace_Op); |
| NULL != clip; |
| clip = iter.next()) { |
| |
| if (clip->fDoAA) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| } |
| |
| /* |
| * 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 SkClipStack& clipIn) { |
| |
| // 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. |
| bool useSW = false; |
| |
| SkClipStack::Iter iter(clipIn, SkClipStack::Iter::kBottom_IterStart); |
| const SkClipStack::Iter::Clip* clip = NULL; |
| |
| for (clip = iter.skipToTopmost(SkRegion::kReplace_Op); |
| NULL != clip; |
| clip = iter.next()) { |
| |
| if (SkRegion::kReplace_Op == clip->fOp) { |
| // Everything before a replace op can be ignored so start |
| // afresh w.r.t. determining if any element uses the SW path |
| useSW = false; |
| } |
| |
| // rects can always be drawn directly w/o using the software path |
| // so only paths need to be checked |
| if (NULL != clip->fPath && |
| path_needs_SW_renderer(this->getContext(), fGpu, |
| *clip->fPath, |
| get_path_fill(*clip->fPath), |
| clip->fDoAA)) { |
| useSW = true; |
| } |
| } |
| |
| return useSW; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // sort out what kind of clip mask needs to be created: alpha, stencil, |
| // scissor, or entirely software |
| bool GrClipMaskManager::setupClipping(const GrClipData* clipDataIn) { |
| fCurrClipMaskType = kNone_ClipMaskType; |
| |
| GrDrawState* drawState = fGpu->drawState(); |
| if (!drawState->isClipState() || clipDataIn->fClipStack->isWideOpen()) { |
| fGpu->disableScissor(); |
| this->setGpuStencil(); |
| return true; |
| } |
| |
| GrRenderTarget* rt = drawState->getRenderTarget(); |
| // GrDrawTarget should have filtered this for us |
| GrAssert(NULL != rt); |
| |
| GrIRect devClipBounds; |
| bool isIntersectionOfRects = false; |
| |
| clipDataIn->getConservativeBounds(rt, &devClipBounds, |
| &isIntersectionOfRects); |
| if (devClipBounds.isEmpty()) { |
| return false; |
| } |
| |
| #if GR_SW_CLIP |
| bool requiresAA = requires_AA(*clipDataIn->fClipStack); |
| |
| // If MSAA is enabled we can do everything in the stencil buffer. |
| // Otherwise check if we should just create the entire clip mask |
| // in software (this will only happen if the clip mask is anti-aliased |
| // and too complex for the gpu to handle in its entirety) |
| if (0 == rt->numSamples() && |
| requiresAA && |
| this->useSWOnlyPath(*clipDataIn->fClipStack)) { |
| // The clip geometry is complex enough that it will be more |
| // efficient to create it entirely in software |
| GrTexture* result = NULL; |
| GrIRect devBound; |
| if (this->createSoftwareClipMask(*clipDataIn, &result, &devBound)) { |
| setup_drawstate_aaclip(fGpu, result, devBound); |
| fGpu->disableScissor(); |
| this->setGpuStencil(); |
| return true; |
| } |
| |
| // if SW clip mask creation fails fall through to the other |
| // two possible methods (bottoming out at stencil clipping) |
| } |
| #endif // GR_SW_CLIP |
| |
| #if GR_AA_CLIP |
| // If MSAA is enabled use the (faster) stencil path for AA clipping |
| // otherwise the alpha clip mask is our only option |
| if (0 == rt->numSamples() && requiresAA) { |
| // Since we are going to create a destination texture of the correct |
| // size for the mask (rather than being bound by the size of the |
| // render target) we aren't going to use scissoring like the stencil |
| // path does (see scissorSettings below) |
| GrTexture* result = NULL; |
| GrIRect devBound; |
| if (this->createAlphaClipMask(*clipDataIn, &result, &devBound)) { |
| setup_drawstate_aaclip(fGpu, result, devBound); |
| fGpu->disableScissor(); |
| this->setGpuStencil(); |
| return true; |
| } |
| |
| // if alpha clip mask creation fails fall through to the stencil |
| // buffer method |
| } |
| #endif // GR_AA_CLIP |
| |
| // Either a hard (stencil buffer) clip was explicitly requested or |
| // an antialiased clip couldn't be created. In either case, free up |
| // the texture in the antialiased 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 (isIntersectionOfRects) { |
| fGpu->enableScissor(devClipBounds); |
| this->setGpuStencil(); |
| return true; |
| } |
| |
| // use the stencil clip if we can't represent the clip as a rectangle. |
| bool useStencil = !clipDataIn->fClipStack->isWideOpen() && |
| !devClipBounds.isEmpty(); |
| |
| if (useStencil) { |
| this->createStencilClipMask(*clipDataIn, devClipBounds); |
| } |
| // 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. |
| fGpu->enableScissor(devClipBounds); |
| this->setGpuStencil(); |
| return true; |
| } |
| |
| #define VISUALIZE_COMPLEX_CLIP 0 |
| |
| #if VISUALIZE_COMPLEX_CLIP |
| #include "GrRandom.h" |
| GrRandom gRandom; |
| #define SET_RANDOM_COLOR drawState->setColor(0xff000000 | gRandom.nextU()); |
| #else |
| #define SET_RANDOM_COLOR |
| #endif |
| |
| namespace { |
| /** |
| * Does "canvContainer" contain "devContainee"? If either is empty then |
| * no containment is possible. "canvContainer" is in canvas coordinates while |
| * "devContainee" is in device coordiates. "origin" provides the mapping between |
| * the two. |
| */ |
| bool contains(const SkRect& canvContainer, |
| const SkIRect& devContainee, |
| const SkIPoint& origin) { |
| return !devContainee.isEmpty() && !canvContainer.isEmpty() && |
| canvContainer.fLeft <= SkIntToScalar(devContainee.fLeft+origin.fX) && |
| canvContainer.fTop <= SkIntToScalar(devContainee.fTop+origin.fY) && |
| canvContainer.fRight >= SkIntToScalar(devContainee.fRight+origin.fX) && |
| canvContainer.fBottom >= SkIntToScalar(devContainee.fBottom+origin.fY); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // determines how many elements at the head of the clip can be skipped and |
| // whether the initial clear should be to the inside- or outside-the-clip value, |
| // and what op should be used to draw the first element that isn't skipped. |
| const SkClipStack::Iter::Clip* process_initial_clip_elements( |
| SkClipStack::Iter* iter, |
| const GrIRect& devBounds, |
| bool* clearToInside, |
| SkRegion::Op* firstOp, |
| const GrClipData& clipData) { |
| |
| GrAssert(NULL != iter && NULL != clearToInside && NULL != firstOp); |
| |
| // logically before the first element of the clip stack is |
| // processed the clip is entirely open. However, depending on the |
| // first set op we may prefer to clear to 0 for performance. We may |
| // also be able to skip the initial clip paths/rects. We loop until |
| // we cannot skip an element. |
| bool done = false; |
| *clearToInside = true; |
| |
| const SkClipStack::Iter::Clip* clip = NULL; |
| |
| for (clip = iter->skipToTopmost(SkRegion::kReplace_Op); |
| NULL != clip && !done; |
| clip = iter->next()) { |
| switch (clip->fOp) { |
| case SkRegion::kReplace_Op: |
| // replace ignores everything previous |
| *firstOp = SkRegion::kReplace_Op; |
| *clearToInside = false; |
| done = true; |
| break; |
| case SkRegion::kIntersect_Op: |
| // if this element contains the entire bounds then we |
| // can skip it. |
| if (NULL != clip->fRect && |
| contains(*clip->fRect, devBounds, clipData.fOrigin)) { |
| break; |
| } |
| // if everything is initially clearToInside then intersect is |
| // same as clear to 0 and treat as a replace. Otherwise, |
| // set stays empty. |
| if (*clearToInside) { |
| *firstOp = SkRegion::kReplace_Op; |
| *clearToInside = false; |
| done = true; |
| } |
| break; |
| // we can skip a leading union. |
| case SkRegion::kUnion_Op: |
| // if everything is initially outside then union is |
| // same as replace. Otherwise, every pixel is still |
| // clearToInside |
| if (!*clearToInside) { |
| *firstOp = SkRegion::kReplace_Op; |
| done = true; |
| } |
| break; |
| case SkRegion::kXOR_Op: |
| // xor is same as difference or replace both of which |
| // can be 1-pass instead of 2 for xor. |
| if (*clearToInside) { |
| *firstOp = SkRegion::kDifference_Op; |
| } else { |
| *firstOp = SkRegion::kReplace_Op; |
| } |
| done = true; |
| break; |
| case SkRegion::kDifference_Op: |
| // if all pixels are clearToInside then we have to process the |
| // difference, otherwise it has no effect and all pixels |
| // remain outside. |
| if (*clearToInside) { |
| *firstOp = SkRegion::kDifference_Op; |
| done = true; |
| } |
| break; |
| case SkRegion::kReverseDifference_Op: |
| // if all pixels are clearToInside then reverse difference |
| // produces empty set. Otherise it is same as replace |
| if (*clearToInside) { |
| *clearToInside = false; |
| } else { |
| *firstOp = SkRegion::kReplace_Op; |
| done = true; |
| } |
| break; |
| default: |
| GrCrash("Unknown set op."); |
| } |
| |
| if (done) { |
| // we need to break out here (rather than letting the test in |
| // the loop do it) since backing up the iterator is very expensive |
| break; |
| } |
| } |
| return clip; |
| } |
| |
| } |
| |
| 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: |
| GrAssert(false); |
| break; |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool draw_path_in_software(GrContext* context, |
| GrGpu* gpu, |
| const SkPath& path, |
| GrPathFill fill, |
| bool doAA, |
| const GrIRect& resultBounds) { |
| |
| SkAutoTUnref<GrTexture> texture( |
| GrSWMaskHelper::DrawPathMaskToTexture(context, path, |
| resultBounds, fill, |
| doAA, NULL)); |
| if (NULL == texture) { |
| return false; |
| } |
| |
| // The ClipMaskManager accumulates the clip mask in the UL corner |
| GrIRect rect = GrIRect::MakeWH(resultBounds.width(), resultBounds.height()); |
| |
| GrSWMaskHelper::DrawToTargetWithPathMask(texture, gpu, rect); |
| |
| GrAssert(!GrIsFillInverted(fill)); |
| return true; |
| } |
| |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool draw_path(GrContext* context, |
| GrGpu* gpu, |
| const SkPath& path, |
| GrPathFill fill, |
| bool doAA, |
| const GrIRect& resultBounds) { |
| |
| GrPathRenderer* pr = context->getPathRenderer(path, fill, gpu, doAA, false); |
| if (NULL == pr) { |
| return draw_path_in_software(context, gpu, path, fill, doAA, resultBounds); |
| } |
| |
| pr->drawPath(path, fill, gpu, doAA); |
| return true; |
| } |
| |
| // 'rect' enters in device coordinates and leaves in canvas coordinates |
| void device_to_canvas(SkRect* rect, const SkIPoint& origin) { |
| GrAssert(NULL != rect); |
| |
| rect->fLeft += SkIntToScalar(origin.fX); |
| rect->fTop += SkIntToScalar(origin.fY); |
| rect->fRight += SkIntToScalar(origin.fX); |
| rect->fBottom += SkIntToScalar(origin.fY); |
| } |
| |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool GrClipMaskManager::drawClipShape(GrTexture* target, |
| const SkClipStack::Iter::Clip* clip, |
| const GrIRect& resultBounds) { |
| GrDrawState* drawState = fGpu->drawState(); |
| GrAssert(NULL != drawState); |
| |
| drawState->setRenderTarget(target->asRenderTarget()); |
| |
| if (NULL != clip->fRect) { |
| if (clip->fDoAA) { |
| getContext()->getAARectRenderer()->fillAARect(fGpu, fGpu, |
| *clip->fRect, |
| true); |
| } else { |
| fGpu->drawSimpleRect(*clip->fRect, NULL); |
| } |
| } else if (NULL != clip->fPath) { |
| return draw_path(this->getContext(), fGpu, |
| *clip->fPath, |
| get_path_fill(*clip->fPath), |
| clip->fDoAA, |
| resultBounds); |
| } |
| return true; |
| } |
| |
| void GrClipMaskManager::drawTexture(GrTexture* target, |
| GrTexture* texture) { |
| GrDrawState* drawState = fGpu->drawState(); |
| GrAssert(NULL != drawState); |
| |
| // no AA here since it is encoded in the texture |
| drawState->setRenderTarget(target->asRenderTarget()); |
| |
| GrMatrix sampleM; |
| sampleM.setIDiv(texture->width(), texture->height()); |
| |
| drawState->createTextureEffect(0, texture, sampleM); |
| |
| GrRect rect = GrRect::MakeWH(SkIntToScalar(target->width()), |
| SkIntToScalar(target->height())); |
| |
| fGpu->drawSimpleRect(rect, NULL); |
| |
| drawState->disableStage(0); |
| } |
| |
| // 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(const GrIRect& bounds, |
| GrAutoScratchTexture* temp) { |
| if (NULL != temp->texture()) { |
| // we've already allocated the temp texture |
| return; |
| } |
| |
| GrTextureDesc desc; |
| desc.fFlags = kRenderTarget_GrTextureFlagBit|kNoStencil_GrTextureFlagBit; |
| desc.fWidth = bounds.width(); |
| desc.fHeight = bounds.height(); |
| desc.fConfig = kAlpha_8_GrPixelConfig; |
| |
| temp->set(this->getContext(), desc); |
| } |
| |
| |
| void GrClipMaskManager::setupCache(const SkClipStack& clipIn, |
| const GrIRect& bounds) { |
| // 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 = kRenderTarget_GrTextureFlagBit|kNoStencil_GrTextureFlagBit; |
| desc.fWidth = bounds.width(); |
| desc.fHeight = bounds.height(); |
| desc.fConfig = kAlpha_8_GrPixelConfig; |
| |
| fAACache.acquireMask(clipIn, desc, bounds); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Shared preamble between gpu and SW-only AA clip mask creation paths. |
| // Handles caching, determination of clip mask bound & allocation (if needed) |
| // of the result texture |
| // Returns true if there is no more work to be done (i.e., we got a cache hit) |
| bool GrClipMaskManager::clipMaskPreamble(const GrClipData& clipDataIn, |
| GrTexture** result, |
| GrIRect* devResultBounds) { |
| GrDrawState* origDrawState = fGpu->drawState(); |
| GrAssert(origDrawState->isClipState()); |
| |
| GrRenderTarget* rt = origDrawState->getRenderTarget(); |
| GrAssert(NULL != rt); |
| |
| // unlike the stencil path the alpha path is not bound to the size of the |
| // render target - determine the minimum size required for the mask |
| // Note: intBounds is in device (as opposed to canvas) coordinates |
| clipDataIn.getConservativeBounds(rt, devResultBounds); |
| |
| // need to outset a pixel since the standard bounding box computation |
| // path doesn't leave any room for antialiasing (esp. w.r.t. rects) |
| devResultBounds->outset(1, 1); |
| |
| // TODO: make sure we don't outset if bounds are still 0,0 @ min |
| |
| if (fAACache.canReuse(*clipDataIn.fClipStack, *devResultBounds)) { |
| *result = fAACache.getLastMask(); |
| fAACache.getLastBound(devResultBounds); |
| return true; |
| } |
| |
| this->setupCache(*clipDataIn.fClipStack, *devResultBounds); |
| return false; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Create a 8-bit clip mask in alpha |
| bool GrClipMaskManager::createAlphaClipMask(const GrClipData& clipDataIn, |
| GrTexture** result, |
| GrIRect *devResultBounds) { |
| GrAssert(NULL != devResultBounds); |
| GrAssert(kNone_ClipMaskType == fCurrClipMaskType); |
| |
| if (this->clipMaskPreamble(clipDataIn, result, devResultBounds)) { |
| fCurrClipMaskType = kAlpha_ClipMaskType; |
| return true; |
| } |
| |
| // Note: 'resultBounds' is in device (as opposed to canvas) coordinates |
| |
| GrTexture* accum = fAACache.getLastMask(); |
| if (NULL == accum) { |
| fAACache.reset(); |
| return false; |
| } |
| |
| GrDrawTarget::AutoStateRestore asr(fGpu, GrDrawTarget::kReset_ASRInit); |
| GrDrawState* drawState = fGpu->drawState(); |
| |
| GrDrawTarget::AutoGeometryPush agp(fGpu); |
| |
| if (0 != devResultBounds->fTop || 0 != devResultBounds->fLeft || |
| 0 != clipDataIn.fOrigin.fX || 0 != clipDataIn.fOrigin.fY) { |
| // if we were able to trim down the size of the mask we need to |
| // offset the paths & rects that will be used to compute it |
| drawState->viewMatrix()->setTranslate( |
| SkIntToScalar(-devResultBounds->fLeft-clipDataIn.fOrigin.fX), |
| SkIntToScalar(-devResultBounds->fTop-clipDataIn.fOrigin.fY)); |
| } |
| |
| bool clearToInside; |
| SkRegion::Op firstOp = SkRegion::kReplace_Op; // suppress warning |
| |
| SkClipStack::Iter iter(*clipDataIn.fClipStack, |
| SkClipStack::Iter::kBottom_IterStart); |
| const SkClipStack::Iter::Clip* clip = process_initial_clip_elements(&iter, |
| *devResultBounds, |
| &clearToInside, |
| &firstOp, |
| clipDataIn); |
| |
| fGpu->clear(NULL, |
| clearToInside ? 0xffffffff : 0x00000000, |
| accum->asRenderTarget()); |
| |
| GrAutoScratchTexture temp; |
| bool first = true; |
| // walk through each clip element and perform its set op |
| for ( ; NULL != clip; clip = iter.next()) { |
| |
| SkRegion::Op op = clip->fOp; |
| if (first) { |
| first = false; |
| op = firstOp; |
| } |
| |
| if (SkRegion::kReplace_Op == op) { |
| // clear the accumulator and draw the new object directly into it |
| fGpu->clear(NULL, 0x00000000, accum->asRenderTarget()); |
| |
| setup_boolean_blendcoeffs(drawState, op); |
| this->drawClipShape(accum, clip, *devResultBounds); |
| |
| } else if (SkRegion::kReverseDifference_Op == op || |
| SkRegion::kIntersect_Op == op) { |
| // there is no point in intersecting a screen filling rectangle. |
| if (SkRegion::kIntersect_Op == op && NULL != clip->fRect && |
| contains(*clip->fRect, *devResultBounds, clipDataIn.fOrigin)) { |
| continue; |
| } |
| |
| getTemp(*devResultBounds, &temp); |
| if (NULL == temp.texture()) { |
| fAACache.reset(); |
| return false; |
| } |
| |
| // clear the temp target & draw into it |
| fGpu->clear(NULL, 0x00000000, temp.texture()->asRenderTarget()); |
| |
| setup_boolean_blendcoeffs(drawState, SkRegion::kReplace_Op); |
| this->drawClipShape(temp.texture(), clip, *devResultBounds); |
| |
| // TODO: rather than adding these two translations here |
| // compute the bounding box needed to render the texture |
| // into temp |
| if (0 != devResultBounds->fTop || 0 != devResultBounds->fLeft || |
| 0 != clipDataIn.fOrigin.fX || 0 != clipDataIn.fOrigin.fY) { |
| // In order for the merge of the temp clip into the accumulator |
| // to work we need to disable the translation |
| drawState->viewMatrix()->reset(); |
| } |
| |
| // Now draw into the accumulator using the real operation |
| // and the temp buffer as a texture |
| setup_boolean_blendcoeffs(drawState, op); |
| this->drawTexture(accum, temp.texture()); |
| |
| if (0 != devResultBounds->fTop || 0 != devResultBounds->fLeft || |
| 0 != clipDataIn.fOrigin.fX || 0 != clipDataIn.fOrigin.fY) { |
| drawState->viewMatrix()->setTranslate( |
| SkIntToScalar(-devResultBounds->fLeft-clipDataIn.fOrigin.fX), |
| SkIntToScalar(-devResultBounds->fTop-clipDataIn.fOrigin.fY)); |
| } |
| |
| } else { |
| // all the remaining ops can just be directly draw into |
| // the accumulation buffer |
| setup_boolean_blendcoeffs(drawState, op); |
| this->drawClipShape(accum, clip, *devResultBounds); |
| } |
| } |
| |
| *result = accum; |
| fCurrClipMaskType = kAlpha_ClipMaskType; |
| return true; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // 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.next()) { |
| 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); |
| } |
| } |
| } |
| // restore clip |
| fGpu->setClip(oldClipData); |
| } |
| // set this last because recursive draws may overwrite it back to kNone. |
| GrAssert(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. |
| GrAssert(!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(); |
| } |
| |
| GrAssert(fGpu->getCaps().stencilWrapOpsSupport() || |
| !settings.usesWrapOp()); |
| GrAssert(fGpu->getCaps().twoSidedStencilSupport() || !settings.isTwoSided()); |
| this->adjustStencilParams(&settings, clipMode, stencilBits); |
| fGpu->setStencilSettings(settings); |
| } |
| |
| void GrClipMaskManager::adjustStencilParams(GrStencilSettings* settings, |
| StencilClipMode mode, |
| int stencilBitCnt) { |
| GrAssert(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->getCaps().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); |
| |
| GrAssert((unsigned) func < kStencilFuncCount); |
| |
| writeMask &= userBits; |
| |
| if (func >= kBasicStencilFuncCount) { |
| int respectClip = kRespectClip_StencilClipMode == mode; |
| if (respectClip) { |
| // The GrGpu class should have checked this |
| GrAssert(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]; |
| GrAssert(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(); |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| namespace { |
| |
| GrPathFill invert_fill(GrPathFill fill) { |
| static const GrPathFill gInvertedFillTable[] = { |
| kInverseWinding_GrPathFill, // kWinding_GrPathFill |
| kInverseEvenOdd_GrPathFill, // kEvenOdd_GrPathFill |
| kWinding_GrPathFill, // kInverseWinding_GrPathFill |
| kEvenOdd_GrPathFill, // kInverseEvenOdd_GrPathFill |
| kHairLine_GrPathFill, // kHairLine_GrPathFill |
| }; |
| GR_STATIC_ASSERT(0 == kWinding_GrPathFill); |
| GR_STATIC_ASSERT(1 == kEvenOdd_GrPathFill); |
| GR_STATIC_ASSERT(2 == kInverseWinding_GrPathFill); |
| GR_STATIC_ASSERT(3 == kInverseEvenOdd_GrPathFill); |
| GR_STATIC_ASSERT(4 == kHairLine_GrPathFill); |
| GR_STATIC_ASSERT(5 == kGrPathFillCount); |
| return gInvertedFillTable[fill]; |
| } |
| |
| } |
| |
| bool GrClipMaskManager::createSoftwareClipMask(const GrClipData& clipDataIn, |
| GrTexture** result, |
| GrIRect* devResultBounds) { |
| GrAssert(kNone_ClipMaskType == fCurrClipMaskType); |
| |
| if (this->clipMaskPreamble(clipDataIn, result, devResultBounds)) { |
| return true; |
| } |
| |
| GrTexture* accum = fAACache.getLastMask(); |
| if (NULL == accum) { |
| fAACache.reset(); |
| return false; |
| } |
| |
| GrSWMaskHelper helper(this->getContext()); |
| |
| GrMatrix matrix; |
| matrix.setTranslate(SkIntToScalar(-clipDataIn.fOrigin.fX), |
| SkIntToScalar(-clipDataIn.fOrigin.fY)); |
| helper.init(*devResultBounds, &matrix); |
| |
| bool clearToInside; |
| SkRegion::Op firstOp = SkRegion::kReplace_Op; // suppress warning |
| |
| SkClipStack::Iter iter(*clipDataIn.fClipStack, |
| SkClipStack::Iter::kBottom_IterStart); |
| const SkClipStack::Iter::Clip* clip = process_initial_clip_elements(&iter, |
| *devResultBounds, |
| &clearToInside, |
| &firstOp, |
| clipDataIn); |
| |
| helper.clear(clearToInside ? 0xFF : 0x00); |
| |
| bool first = true; |
| for ( ; NULL != clip; clip = iter.next()) { |
| |
| SkRegion::Op op = clip->fOp; |
| if (first) { |
| first = false; |
| op = firstOp; |
| } |
| |
| 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; |
| temp.set(*devResultBounds); |
| temp.offset(SkIntToScalar(clipDataIn.fOrigin.fX), |
| SkIntToScalar(clipDataIn.fOrigin.fX)); |
| |
| // invert the entire scene |
| helper.draw(temp, SkRegion::kXOR_Op, false, 0xFF); |
| } |
| |
| if (NULL != clip->fRect) { |
| |
| // convert the rect to a path so we can invert the fill |
| SkPath temp; |
| temp.addRect(*clip->fRect); |
| |
| helper.draw(temp, SkRegion::kReplace_Op, |
| kInverseEvenOdd_GrPathFill, clip->fDoAA, |
| 0x00); |
| } else if (NULL != clip->fPath) { |
| helper.draw(*clip->fPath, |
| SkRegion::kReplace_Op, |
| invert_fill(get_path_fill(*clip->fPath)), |
| clip->fDoAA, |
| 0x00); |
| } |
| |
| continue; |
| } |
| |
| // The other ops (union, xor, diff) only affect pixels inside |
| // the geometry so they can just be drawn normally |
| if (NULL != clip->fRect) { |
| |
| helper.draw(*clip->fRect, |
| op, |
| clip->fDoAA, 0xFF); |
| |
| } else if (NULL != clip->fPath) { |
| helper.draw(*clip->fPath, |
| op, |
| get_path_fill(*clip->fPath), |
| clip->fDoAA, 0xFF); |
| } |
| } |
| |
| // Because we are using the scratch texture cache, "accum" may be |
| // larger than expected and have some cruft in the areas we aren't using. |
| // Clear it out. |
| fGpu->clear(NULL, 0x00000000, accum->asRenderTarget()); |
| |
| helper.toTexture(accum, clearToInside ? 0xFF : 0x00); |
| |
| *result = accum; |
| |
| fCurrClipMaskType = kAlpha_ClipMaskType; |
| return true; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void GrClipMaskManager::releaseResources() { |
| fAACache.releaseResources(); |
| } |