| |
| /* |
| * 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" |
| |
| // TODO: move GrSWMaskHelper out of GrSoftwarePathRender.h & remove this include |
| #include "GrSoftwarePathRenderer.h" |
| |
| //#define GR_AA_CLIP 1 |
| //#define GR_SW_CLIP 1 |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void ScissoringSettings::setupScissoring(GrGpu* gpu) { |
| if (!fEnableScissoring) { |
| gpu->disableScissor(); |
| return; |
| } |
| |
| gpu->enableScissoring(fScissorRect); |
| } |
| |
| 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 &bound) { |
| GrDrawState* drawState = gpu->drawState(); |
| GrAssert(drawState); |
| |
| static const int maskStage = GrPaint::kTotalStages+1; |
| |
| GrMatrix mat; |
| mat.setIDiv(result->width(), result->height()); |
| mat.preTranslate(SkIntToScalar(-bound.fLeft), SkIntToScalar(-bound.fTop)); |
| mat.preConcat(drawState->getViewMatrix()); |
| |
| drawState->sampler(maskStage)->reset(GrSamplerState::kClamp_WrapMode, |
| GrSamplerState::kNearest_Filter, |
| mat); |
| |
| drawState->setTexture(maskStage, result); |
| |
| // The AA clipping determination happens long after the geometry has |
| // been set up to draw. Here we directly enable the AA clip mask stage |
| gpu->addToVertexLayout( |
| GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(maskStage)); |
| } |
| |
| 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); |
| } |
| |
| } |
| |
| /* |
| * 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(GrGpu* gpu, const GrClip& clipIn) { |
| |
| if (!clipIn.requiresAA()) { |
| // The stencil buffer can handle this case |
| return false; |
| } |
| |
| // 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; |
| |
| for (int i = 0; i < clipIn.getElementCount(); ++i) { |
| |
| if (SkRegion::kReplace_Op == clipIn.getOp(i)) { |
| // Everything before a replace op can be ignored so start |
| // afresh w.r.t. determining if any element uses the SW path |
| useSW = false; |
| } |
| |
| if (kRect_ClipType == clipIn.getElementType(i)) { |
| // Non-anti-aliased rects can always be drawn directly (w/o |
| // using the software path) so the anti-aliased rects are all |
| // that need to be checked here |
| if (clipIn.getDoAA(i)) { |
| // Antialiased rects are converted to paths and then drawn with |
| // kEvenOdd_PathFill. |
| |
| // TODO: wrap GrContext::fillAARect in a helper class and |
| // draw AA rects directly rather than converting to paths |
| SkPath temp; |
| temp.addRect(clipIn.getRect(i)); |
| |
| if (path_needs_SW_renderer(this->getContext(), gpu, temp, |
| kEvenOdd_PathFill, true)) { |
| useSW = true; |
| } |
| } |
| } else { |
| if (path_needs_SW_renderer(this->getContext(), gpu, |
| clipIn.getPath(i), |
| clipIn.getPathFill(i), |
| clipIn.getDoAA(i))) { |
| useSW = true; |
| } |
| } |
| } |
| |
| return useSW; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // sort out what kind of clip mask needs to be created: alpha, stencil, |
| // scissor, or entirely software |
| bool GrClipMaskManager::createClipMask(GrGpu* gpu, |
| const GrClip& clipIn, |
| ScissoringSettings* scissorSettings) { |
| |
| GrAssert(scissorSettings); |
| |
| scissorSettings->fEnableScissoring = false; |
| fClipMaskInStencil = false; |
| fClipMaskInAlpha = false; |
| |
| GrDrawState* drawState = gpu->drawState(); |
| if (!drawState->isClipState()) { |
| return true; |
| } |
| |
| GrRenderTarget* rt = drawState->getRenderTarget(); |
| |
| // GrDrawTarget should have filtered this for us |
| GrAssert(NULL != rt); |
| |
| #if GR_SW_CLIP |
| // 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() && useSWOnlyPath(gpu, clipIn)) { |
| // The clip geometry is complex enough that it will be more |
| // efficient to create it entirely in software |
| GrTexture* result = NULL; |
| GrIRect bound; |
| if (this->createSoftwareClipMask(gpu, clipIn, &result, &bound)) { |
| fClipMaskInAlpha = true; |
| |
| setup_drawstate_aaclip(gpu, result, bound); |
| 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() && clipIn.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 bound; |
| if (this->createAlphaClipMask(gpu, clipIn, &result, &bound)) { |
| fClipMaskInAlpha = true; |
| |
| setup_drawstate_aaclip(gpu, result, bound); |
| 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(); |
| |
| GrRect bounds; |
| GrRect rtRect; |
| rtRect.setLTRB(0, 0, |
| GrIntToScalar(rt->width()), GrIntToScalar(rt->height())); |
| if (clipIn.hasConservativeBounds()) { |
| bounds = clipIn.getConservativeBounds(); |
| if (!bounds.intersect(rtRect)) { |
| bounds.setEmpty(); |
| } |
| } else { |
| bounds = rtRect; |
| } |
| |
| bounds.roundOut(&scissorSettings->fScissorRect); |
| if (scissorSettings->fScissorRect.isEmpty()) { |
| scissorSettings->fScissorRect.setLTRB(0,0,0,0); |
| // TODO: I think we can do an early exit here - after refactoring try: |
| // set fEnableScissoring to true but leave fClipMaskInStencil false |
| // and return - everything is going to be scissored away anyway! |
| } |
| scissorSettings->fEnableScissoring = true; |
| |
| // use the stencil clip if we can't represent the clip as a rectangle. |
| fClipMaskInStencil = !clipIn.isRect() && !clipIn.isEmpty() && |
| !bounds.isEmpty(); |
| |
| if (fClipMaskInStencil) { |
| return this->createStencilClipMask(gpu, clipIn, bounds, scissorSettings); |
| } |
| |
| 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 "container" contain "containee"? If either is empty then |
| * no containment is possible. |
| */ |
| bool contains(const SkRect& container, const SkIRect& containee) { |
| return !containee.isEmpty() && !container.isEmpty() && |
| container.fLeft <= SkIntToScalar(containee.fLeft) && |
| container.fTop <= SkIntToScalar(containee.fTop) && |
| container.fRight >= SkIntToScalar(containee.fRight) && |
| container.fBottom >= SkIntToScalar(containee.fBottom); |
| } |
| |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // 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. |
| int process_initial_clip_elements(const GrClip& clip, |
| const GrIRect& bounds, |
| bool* clearToInside, |
| SkRegion::Op* startOp) { |
| |
| // 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. |
| int curr; |
| bool done = false; |
| *clearToInside = true; |
| int count = clip.getElementCount(); |
| |
| for (curr = 0; curr < count && !done; ++curr) { |
| switch (clip.getOp(curr)) { |
| case SkRegion::kReplace_Op: |
| // replace ignores everything previous |
| *startOp = 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 (kRect_ClipType == clip.getElementType(curr) |
| && contains(clip.getRect(curr), bounds)) { |
| 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) { |
| *startOp = 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) { |
| *startOp = 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) { |
| *startOp = SkRegion::kDifference_Op; |
| } else { |
| *startOp = 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) { |
| *startOp = 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 { |
| *startOp = SkRegion::kReplace_Op; |
| done = true; |
| } |
| break; |
| default: |
| GrCrash("Unknown set op."); |
| } |
| } |
| return done ? curr-1 : count; |
| } |
| |
| } |
| |
| |
| 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_BlendCoeff, kZero_BlendCoeff); |
| break; |
| case SkRegion::kIntersect_Op: |
| drawState->setBlendFunc(kDC_BlendCoeff, kZero_BlendCoeff); |
| break; |
| case SkRegion::kUnion_Op: |
| drawState->setBlendFunc(kOne_BlendCoeff, kISC_BlendCoeff); |
| break; |
| case SkRegion::kXOR_Op: |
| drawState->setBlendFunc(kIDC_BlendCoeff, kISC_BlendCoeff); |
| break; |
| case SkRegion::kDifference_Op: |
| drawState->setBlendFunc(kZero_BlendCoeff, kISC_BlendCoeff); |
| break; |
| case SkRegion::kReverseDifference_Op: |
| drawState->setBlendFunc(kIDC_BlendCoeff, kZero_BlendCoeff); |
| break; |
| default: |
| GrAssert(false); |
| break; |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool draw_path(GrContext* context, |
| GrGpu* gpu, |
| const SkPath& path, |
| GrPathFill fill, |
| bool doAA) { |
| |
| GrPathRenderer* pr = context->getPathRenderer(path, fill, gpu, doAA, true); |
| if (NULL == pr) { |
| return false; |
| } |
| |
| pr->drawPath(path, fill, NULL, gpu, 0, doAA); |
| return true; |
| } |
| |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool GrClipMaskManager::drawClipShape(GrGpu* gpu, |
| GrTexture* target, |
| const GrClip& clipIn, |
| int index) { |
| GrDrawState* drawState = gpu->drawState(); |
| GrAssert(NULL != drawState); |
| |
| drawState->setRenderTarget(target->asRenderTarget()); |
| |
| if (kRect_ClipType == clipIn.getElementType(index)) { |
| if (clipIn.getDoAA(index)) { |
| // convert the rect to a path for AA |
| SkPath temp; |
| temp.addRect(clipIn.getRect(index)); |
| |
| return draw_path(this->getContext(), gpu, temp, |
| kEvenOdd_PathFill, clipIn.getDoAA(index)); |
| } else { |
| gpu->drawSimpleRect(clipIn.getRect(index), NULL, 0); |
| } |
| } else { |
| return draw_path(this->getContext(), gpu, |
| clipIn.getPath(index), |
| clipIn.getPathFill(index), |
| clipIn.getDoAA(index)); |
| } |
| return true; |
| } |
| |
| void GrClipMaskManager::drawTexture(GrGpu* gpu, |
| GrTexture* target, |
| GrTexture* texture) { |
| GrDrawState* drawState = gpu->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->setTexture(0, texture); |
| |
| drawState->sampler(0)->reset(GrSamplerState::kClamp_WrapMode, |
| GrSamplerState::kNearest_Filter, |
| sampleM); |
| |
| GrRect rect = GrRect::MakeWH(SkIntToScalar(target->width()), |
| SkIntToScalar(target->height())); |
| |
| gpu->drawSimpleRect(rect, NULL, 1 << 0); |
| |
| drawState->setTexture(0, NULL); |
| } |
| |
| namespace { |
| |
| void clear(GrGpu* gpu, |
| GrTexture* target, |
| GrColor color) { |
| GrDrawState* drawState = gpu->drawState(); |
| GrAssert(NULL != drawState); |
| |
| // zap entire target to specified color |
| drawState->setRenderTarget(target->asRenderTarget()); |
| gpu->clear(NULL, color); |
| } |
| |
| } |
| |
| // 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; |
| } |
| |
| const GrTextureDesc desc = { |
| kRenderTarget_GrTextureFlagBit|kNoStencil_GrTextureFlagBit, |
| bounds.width(), |
| bounds.height(), |
| kAlpha_8_GrPixelConfig, |
| 0 // samples |
| }; |
| |
| temp->set(this->getContext(), desc); |
| } |
| |
| |
| void GrClipMaskManager::setupCache(const GrClip& 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(); |
| |
| const GrTextureDesc desc = { |
| kRenderTarget_GrTextureFlagBit|kNoStencil_GrTextureFlagBit, |
| bounds.width(), |
| bounds.height(), |
| kAlpha_8_GrPixelConfig, |
| 0 // samples |
| }; |
| |
| 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(GrGpu* gpu, |
| const GrClip& clipIn, |
| GrTexture** result, |
| GrIRect *resultBounds) { |
| GrDrawState* origDrawState = gpu->drawState(); |
| GrAssert(origDrawState->isClipState()); |
| |
| GrRenderTarget* rt = origDrawState->getRenderTarget(); |
| GrAssert(NULL != rt); |
| |
| GrRect rtRect; |
| rtRect.setLTRB(0, 0, |
| GrIntToScalar(rt->width()), GrIntToScalar(rt->height())); |
| |
| // 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 |
| GrRect bounds; |
| |
| if (clipIn.hasConservativeBounds()) { |
| bounds = clipIn.getConservativeBounds(); |
| if (!bounds.intersect(rtRect)) { |
| // the mask will be empty in this case |
| GrAssert(false); |
| bounds.setEmpty(); |
| } |
| } else { |
| // still locked to the size of the render target |
| bounds = rtRect; |
| } |
| |
| GrIRect intBounds; |
| bounds.roundOut(&intBounds); |
| |
| // need to outset a pixel since the standard bounding box computation |
| // path doesn't leave any room for antialiasing (esp. w.r.t. rects) |
| intBounds.outset(1, 1); |
| |
| // TODO: make sure we don't outset if bounds are still 0,0 @ min |
| |
| if (fAACache.canReuse(clipIn, |
| intBounds.width(), |
| intBounds.height())) { |
| *result = fAACache.getLastMask(); |
| fAACache.getLastBound(resultBounds); |
| return true; |
| } |
| |
| this->setupCache(clipIn, intBounds); |
| |
| *resultBounds = intBounds; |
| return false; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Create a 8-bit clip mask in alpha |
| bool GrClipMaskManager::createAlphaClipMask(GrGpu* gpu, |
| const GrClip& clipIn, |
| GrTexture** result, |
| GrIRect *resultBounds) { |
| |
| if (this->clipMaskPreamble(gpu, clipIn, result, resultBounds)) { |
| return true; |
| } |
| |
| GrTexture* accum = fAACache.getLastMask(); |
| if (NULL == accum) { |
| fClipMaskInAlpha = false; |
| fAACache.reset(); |
| return false; |
| } |
| |
| GrDrawTarget::AutoStateRestore asr(gpu, GrDrawTarget::kReset_ASRInit); |
| GrDrawState* drawState = gpu->drawState(); |
| |
| GrDrawTarget::AutoGeometryPush agp(gpu); |
| |
| int count = clipIn.getElementCount(); |
| |
| if (0 != resultBounds->fTop || 0 != resultBounds->fLeft) { |
| // 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 |
| GrMatrix m; |
| |
| m.setTranslate(SkIntToScalar(-resultBounds->fLeft), |
| SkIntToScalar(-resultBounds->fTop)); |
| |
| drawState->setViewMatrix(m); |
| } |
| |
| bool clearToInside; |
| SkRegion::Op startOp = SkRegion::kReplace_Op; // suppress warning |
| int start = process_initial_clip_elements(clipIn, |
| *resultBounds, |
| &clearToInside, |
| &startOp); |
| |
| clear(gpu, accum, clearToInside ? 0xffffffff : 0x00000000); |
| |
| GrAutoScratchTexture temp; |
| |
| // walk through each clip element and perform its set op |
| for (int c = start; c < count; ++c) { |
| |
| SkRegion::Op op = (c == start) ? startOp : clipIn.getOp(c); |
| |
| if (SkRegion::kReplace_Op == op) { |
| // TODO: replace is actually a lot faster then intersection |
| // for this path - refactor the stencil path so it can handle |
| // replace ops and alter GrClip to allow them through |
| |
| // clear the accumulator and draw the new object directly into it |
| clear(gpu, accum, 0x00000000); |
| |
| setup_boolean_blendcoeffs(drawState, op); |
| this->drawClipShape(gpu, accum, clipIn, c); |
| |
| } 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 && |
| kRect_ClipType == clipIn.getElementType(c) && |
| contains(clipIn.getRect(c), *resultBounds)) { |
| continue; |
| } |
| |
| getTemp(*resultBounds, &temp); |
| if (NULL == temp.texture()) { |
| fClipMaskInAlpha = false; |
| fAACache.reset(); |
| return false; |
| } |
| |
| // clear the temp target & draw into it |
| clear(gpu, temp.texture(), 0x00000000); |
| |
| setup_boolean_blendcoeffs(drawState, SkRegion::kReplace_Op); |
| this->drawClipShape(gpu, temp.texture(), clipIn, c); |
| |
| // TODO: rather than adding these two translations here |
| // compute the bounding box needed to render the texture |
| // into temp |
| if (0 != resultBounds->fTop || 0 != resultBounds->fLeft) { |
| GrMatrix m; |
| |
| m.setTranslate(SkIntToScalar(resultBounds->fLeft), |
| SkIntToScalar(resultBounds->fTop)); |
| |
| drawState->preConcatViewMatrix(m); |
| } |
| |
| // Now draw into the accumulator using the real operation |
| // and the temp buffer as a texture |
| setup_boolean_blendcoeffs(drawState, op); |
| this->drawTexture(gpu, accum, temp.texture()); |
| |
| if (0 != resultBounds->fTop || 0 != resultBounds->fLeft) { |
| GrMatrix m; |
| |
| m.setTranslate(SkIntToScalar(-resultBounds->fLeft), |
| SkIntToScalar(-resultBounds->fTop)); |
| |
| drawState->preConcatViewMatrix(m); |
| } |
| |
| } else { |
| // all the remaining ops can just be directly draw into |
| // the accumulation buffer |
| setup_boolean_blendcoeffs(drawState, op); |
| this->drawClipShape(gpu, accum, clipIn, c); |
| } |
| } |
| |
| *result = accum; |
| |
| return true; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Create a 1-bit clip mask in the stencil buffer |
| bool GrClipMaskManager::createStencilClipMask(GrGpu* gpu, |
| const GrClip& clipIn, |
| const GrRect& bounds, |
| ScissoringSettings* scissorSettings) { |
| |
| GrAssert(fClipMaskInStencil); |
| |
| GrDrawState* drawState = gpu->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(clipIn, rt->width(), rt->height())) { |
| |
| stencilBuffer->setLastClip(clipIn, 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 GrClip& clipCopy = stencilBuffer->getLastClip(); |
| gpu->setClip(GrClip(bounds)); |
| |
| GrDrawTarget::AutoStateRestore asr(gpu, GrDrawTarget::kReset_ASRInit); |
| drawState = gpu->drawState(); |
| drawState->setRenderTarget(rt); |
| GrDrawTarget::AutoGeometryPush agp(gpu); |
| |
| gpu->disableScissor(); |
| #if !VISUALIZE_COMPLEX_CLIP |
| drawState->enableState(GrDrawState::kNoColorWrites_StateBit); |
| #endif |
| |
| int count = clipCopy.getElementCount(); |
| int clipBit = stencilBuffer->bits(); |
| SkASSERT((clipBit <= 16) && |
| "Ganesh only handles 16b or smaller stencil buffers"); |
| clipBit = (1 << (clipBit-1)); |
| |
| GrIRect rtRect = GrIRect::MakeWH(rt->width(), rt->height()); |
| |
| bool clearToInside; |
| SkRegion::Op startOp = SkRegion::kReplace_Op; // suppress warning |
| int start = process_initial_clip_elements(clipCopy, |
| rtRect, |
| &clearToInside, |
| &startOp); |
| |
| gpu->clearStencilClip(scissorSettings->fScissorRect, clearToInside); |
| |
| // walk through each clip element and perform its set op |
| // with the existing clip. |
| for (int c = start; c < count; ++c) { |
| GrPathFill fill; |
| bool fillInverted; |
| // enabled at bottom of loop |
| drawState->disableState(GrGpu::kModifyStencilClip_StateBit); |
| |
| bool canRenderDirectToStencil; // 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. |
| |
| SkRegion::Op op = (c == start) ? startOp : clipCopy.getOp(c); |
| |
| GrPathRenderer* pr = NULL; |
| const SkPath* clipPath = NULL; |
| if (kRect_ClipType == clipCopy.getElementType(c)) { |
| canRenderDirectToStencil = true; |
| fill = kEvenOdd_PathFill; |
| fillInverted = false; |
| // there is no point in intersecting a screen filling |
| // rectangle. |
| if (SkRegion::kIntersect_Op == op && |
| contains(clipCopy.getRect(c), rtRect)) { |
| continue; |
| } |
| } else { |
| fill = clipCopy.getPathFill(c); |
| fillInverted = GrIsFillInverted(fill); |
| fill = GrNonInvertedFill(fill); |
| clipPath = &clipCopy.getPath(c); |
| pr = this->getContext()->getPathRenderer(*clipPath, |
| fill, gpu, false, |
| true); |
| if (NULL == pr) { |
| fClipMaskInStencil = false; |
| gpu->setClip(clipCopy); // restore to the original |
| return false; |
| } |
| canRenderDirectToStencil = |
| !pr->requiresStencilPass(*clipPath, fill, gpu); |
| } |
| |
| 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 (kRect_ClipType == clipCopy.getElementType(c)) { |
| *drawState->stencil() = gDrawToStencil; |
| gpu->drawSimpleRect(clipCopy.getRect(c), NULL, 0); |
| } else { |
| if (canRenderDirectToStencil) { |
| *drawState->stencil() = gDrawToStencil; |
| pr->drawPath(*clipPath, fill, NULL, gpu, 0, false); |
| } else { |
| pr->drawPathToStencil(*clipPath, fill, gpu); |
| } |
| } |
| } |
| |
| // 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 (kRect_ClipType == clipCopy.getElementType(c)) { |
| SET_RANDOM_COLOR |
| gpu->drawSimpleRect(clipCopy.getRect(c), NULL, 0); |
| } else { |
| SET_RANDOM_COLOR |
| pr->drawPath(*clipPath, fill, NULL, gpu, 0, false); |
| } |
| } else { |
| SET_RANDOM_COLOR |
| gpu->drawSimpleRect(bounds, NULL, 0); |
| } |
| } |
| } |
| // restore clip |
| gpu->setClip(clipCopy); |
| // recusive draws would have disabled this since they drew with |
| // the clip bounds as clip. |
| fClipMaskInStencil = true; |
| } |
| |
| return true; |
| } |
| |
| namespace { |
| |
| GrPathFill invert_fill(GrPathFill fill) { |
| static const GrPathFill gInvertedFillTable[] = { |
| kInverseWinding_PathFill, // kWinding_PathFill |
| kInverseEvenOdd_PathFill, // kEvenOdd_PathFill |
| kWinding_PathFill, // kInverseWinding_PathFill |
| kEvenOdd_PathFill, // kInverseEvenOdd_PathFill |
| kHairLine_PathFill, // kHairLine_PathFill |
| }; |
| GR_STATIC_ASSERT(0 == kWinding_PathFill); |
| GR_STATIC_ASSERT(1 == kEvenOdd_PathFill); |
| GR_STATIC_ASSERT(2 == kInverseWinding_PathFill); |
| GR_STATIC_ASSERT(3 == kInverseEvenOdd_PathFill); |
| GR_STATIC_ASSERT(4 == kHairLine_PathFill); |
| GR_STATIC_ASSERT(5 == kPathFillCount); |
| return gInvertedFillTable[fill]; |
| } |
| |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| bool GrClipMaskManager::createSoftwareClipMask(GrGpu* gpu, |
| const GrClip& clipIn, |
| GrTexture** result, |
| GrIRect *resultBounds) { |
| |
| if (this->clipMaskPreamble(gpu, clipIn, result, resultBounds)) { |
| return true; |
| } |
| |
| GrTexture* accum = fAACache.getLastMask(); |
| if (NULL == accum) { |
| fClipMaskInAlpha = false; |
| fAACache.reset(); |
| return false; |
| } |
| |
| GrSWMaskHelper helper(this->getContext()); |
| |
| helper.init(*resultBounds, NULL, false); |
| |
| int count = clipIn.getElementCount(); |
| |
| bool clearToInside; |
| SkRegion::Op startOp = SkRegion::kReplace_Op; // suppress warning |
| int start = process_initial_clip_elements(clipIn, |
| *resultBounds, |
| &clearToInside, |
| &startOp); |
| |
| helper.clear(clearToInside ? SK_ColorWHITE : 0x00000000); |
| |
| for (int i = start; i < count; ++i) { |
| |
| SkRegion::Op op = (i == start) ? startOp : clipIn.getOp(i); |
| |
| 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::MakeLTRB( |
| SkIntToScalar(resultBounds->left()), |
| SkIntToScalar(resultBounds->top()), |
| SkIntToScalar(resultBounds->right()), |
| SkIntToScalar(resultBounds->bottom())); |
| |
| // invert the entire scene |
| helper.draw(temp, SkRegion::kXOR_Op, false, SK_ColorWHITE); |
| } |
| |
| if (kRect_ClipType == clipIn.getElementType(i)) { |
| |
| // convert the rect to a path so we can invert the fill |
| SkPath temp; |
| temp.addRect(clipIn.getRect(i)); |
| |
| helper.draw(temp, SkRegion::kReplace_Op, |
| kInverseEvenOdd_PathFill, clipIn.getDoAA(i), |
| 0x00000000); |
| } else { |
| GrAssert(kPath_ClipType == clipIn.getElementType(i)); |
| |
| helper.draw(clipIn.getPath(i), |
| SkRegion::kReplace_Op, |
| invert_fill(clipIn.getPathFill(i)), |
| clipIn.getDoAA(i), |
| 0x00000000); |
| } |
| |
| continue; |
| } |
| |
| // The other ops (union, xor, diff) only affect pixels inside |
| // the geometry so they can just be drawn normally |
| if (kRect_ClipType == clipIn.getElementType(i)) { |
| |
| helper.draw(clipIn.getRect(i), |
| op, |
| clipIn.getDoAA(i), SK_ColorWHITE); |
| |
| } else { |
| GrAssert(kPath_ClipType == clipIn.getElementType(i)); |
| |
| helper.draw(clipIn.getPath(i), |
| op, |
| clipIn.getPathFill(i), |
| clipIn.getDoAA(i), SK_ColorWHITE); |
| } |
| } |
| |
| // 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. |
| |
| // TODO: need a simpler way to clear the texture - can we combine |
| // the clear and the writePixels (inside toTexture) |
| GrDrawState* drawState = gpu->drawState(); |
| GrAssert(NULL != drawState); |
| GrRenderTarget* temp = drawState->getRenderTarget(); |
| clear(gpu, accum, 0x00000000); |
| // can't leave the accum bound as a rendertarget |
| drawState->setRenderTarget(temp); |
| |
| helper.toTexture(accum); |
| |
| *result = accum; |
| |
| return true; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void GrClipMaskManager::releaseResources() { |
| fAACache.releaseResources(); |
| } |