C++ GrRenderTarget::height方法代码示例

void set_dynamic_scissor_state(GrVkGpu* gpu,
                               GrVkCommandBuffer* cmdBuffer,
                               const GrPipeline& pipeline,
                               const GrRenderTarget& target) {
    // We always use one scissor and if it is disabled we just make it the size of the RT
    const GrScissorState& scissorState = pipeline.getScissorState();
    VkRect2D scissor;
    if (scissorState.enabled() &&
        !scissorState.rect().contains(0, 0, target.width(), target.height())) {
        // This all assumes the scissorState has previously been clipped to the device space render
        // target. 
        scissor.offset.x = scissorState.rect().fLeft;
        scissor.extent.width = scissorState.rect().width();
        if (kTopLeft_GrSurfaceOrigin == target.origin()) {
            scissor.offset.y = scissorState.rect().fTop;
        } else {
            SkASSERT(kBottomLeft_GrSurfaceOrigin == target.origin());
            scissor.offset.y = target.height() - scissorState.rect().fBottom;
        }
        scissor.extent.height = scissorState.rect().height();

        SkASSERT(scissor.offset.x >= 0);
        SkASSERT(scissor.offset.x + scissor.extent.width <= (uint32_t)target.width());
        SkASSERT(scissor.offset.y >= 0);
        SkASSERT(scissor.offset.y + scissor.extent.height <= (uint32_t)target.height());
    } else {
        scissor.extent.width = target.width();
        scissor.extent.height = target.height();
        scissor.offset.x = 0;
        scissor.offset.y = 0;
    }
    cmdBuffer->setScissor(gpu, 0, 1, &scissor);
}

void GrGLProgram::setRenderTargetState(const GrPrimitiveProcessor& primProc,
                                       const GrRenderTargetProxy* proxy) {
    GrRenderTarget* rt = proxy->priv().peekRenderTarget();
    // Load the RT height uniform if it is needed to y-flip gl_FragCoord.
    if (fBuiltinUniformHandles.fRTHeightUni.isValid() &&
        fRenderTargetState.fRenderTargetSize.fHeight != rt->height()) {
        fProgramDataManager.set1f(fBuiltinUniformHandles.fRTHeightUni, SkIntToScalar(rt->height()));
    }

    // set RT adjustment
    SkISize size;
    size.set(rt->width(), rt->height());
    if (!primProc.isPathRendering()) {
        if (fRenderTargetState.fRenderTargetOrigin != proxy->origin() ||
            fRenderTargetState.fRenderTargetSize != size) {
            fRenderTargetState.fRenderTargetSize = size;
            fRenderTargetState.fRenderTargetOrigin = proxy->origin();

            float rtAdjustmentVec[4];
            fRenderTargetState.getRTAdjustmentVec(rtAdjustmentVec);
            fProgramDataManager.set4fv(fBuiltinUniformHandles.fRTAdjustmentUni, 1, rtAdjustmentVec);
        }
    } else {
        SkASSERT(fGpu->glCaps().shaderCaps()->pathRenderingSupport());
        const GrPathProcessor& pathProc = primProc.cast<GrPathProcessor>();
        fGpu->glPathRendering()->setProjectionMatrix(pathProc.viewMatrix(),
                                                     size, proxy->origin());
    }
}

bool GrClipMaskManager::setupScissorClip(const GrPipelineBuilder& pipelineBuilder,
                                         GrPipelineBuilder::AutoRestoreStencil* ars,
                                         const SkIRect& clipScissor,
                                         const SkRect* devBounds,
                                         GrAppliedClip* out) {
    if (kRespectClip_StencilClipMode == fClipMode) {
        fClipMode = kIgnoreClip_StencilClipMode;
    }

    GrRenderTarget* rt = pipelineBuilder.getRenderTarget();

    SkIRect clipSpaceRTIBounds = SkIRect::MakeWH(rt->width(), rt->height());
    SkIRect devBoundsScissor;
    const SkIRect* scissor = &clipScissor;
    bool doDevBoundsClip = fDebugClipBatchToBounds && devBounds;
    if (doDevBoundsClip) {
        devBounds->roundOut(&devBoundsScissor);
        if (devBoundsScissor.intersect(clipScissor)) {
            scissor = &devBoundsScissor;
        }
    }

    if (scissor->contains(clipSpaceRTIBounds)) {
        // This counts as wide open
        this->setPipelineBuilderStencil(pipelineBuilder, ars);
        return true;
    }

    if (clipSpaceRTIBounds.intersect(*scissor)) {
        out->fScissorState.set(clipSpaceRTIBounds);
        this->setPipelineBuilderStencil(pipelineBuilder, ars);
        return true;
    }
    return false;
}

bool GrAAHairLinePathRenderer::onDrawPath(const DrawPathArgs& args) {
    SkIRect devClipBounds;
    GrRenderTarget* rt = args.fPipelineBuilder->getRenderTarget();
    args.fPipelineBuilder->clip().getConservativeBounds(rt->width(), rt->height(), &devClipBounds);

    SkAutoTUnref<GrDrawBatch> batch(create_hairline_batch(args.fColor, *args.fViewMatrix, *args.fPath,
                                                          *args.fStroke, devClipBounds));
    args.fTarget->drawBatch(*args.fPipelineBuilder, batch);

    return true;
}

bool GrAAHairLinePathRenderer::onDrawPath(const DrawPathArgs& args) {
    GR_AUDIT_TRAIL_AUTO_FRAME(args.fTarget->getAuditTrail(),"GrAAHairlinePathRenderer::onDrawPath");
    SkIRect devClipBounds;
    GrRenderTarget* rt = args.fPipelineBuilder->getRenderTarget();
    args.fClip->getConservativeBounds(rt->width(), rt->height(), &devClipBounds);

    SkAutoTUnref<GrDrawBatch> batch(create_hairline_batch(args.fColor, *args.fViewMatrix, *args.fPath,
                                                          *args.fStyle, devClipBounds));
    args.fTarget->drawBatch(*args.fPipelineBuilder, *args.fClip, batch);

    return true;
}

////////////////////////////////////////////////////////////////////////////////
// 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;
}

void set_dynamic_viewport_state(GrVkGpu* gpu,
                                GrVkCommandBuffer* cmdBuffer,
                                const GrRenderTarget& target) {
    // We always use one viewport the size of the RT
    VkViewport viewport;
    viewport.x = 0.0f;
    viewport.y = 0.0f;
    viewport.width = SkIntToScalar(target.width());
    viewport.height = SkIntToScalar(target.height());
    viewport.minDepth = 0.0f;
    viewport.maxDepth = 1.0f;
    cmdBuffer->setViewport(gpu, 0, 1, &viewport);
}

static void check_rendertarget(skiatest::Reporter* reporter,
                               const GrCaps& caps,
                               GrResourceProvider* provider,
                               GrRenderTargetProxy* rtProxy,
                               int numSamples,
                               SkBackingFit fit,
                               int expectedMaxWindowRects) {
    REPORTER_ASSERT(reporter, rtProxy->maxWindowRectangles(caps) == expectedMaxWindowRects);
    REPORTER_ASSERT(reporter, rtProxy->numStencilSamples() == numSamples);

    GrSurfaceProxy::UniqueID idBefore = rtProxy->uniqueID();
    bool preinstantiated = rtProxy->isInstantiated();
    REPORTER_ASSERT(reporter, rtProxy->instantiate(provider));
    GrRenderTarget* rt = rtProxy->peekRenderTarget();

    REPORTER_ASSERT(reporter, rtProxy->uniqueID() == idBefore);
    // Deferred resources should always have a different ID from their instantiated rendertarget
    if (preinstantiated) {
        REPORTER_ASSERT(reporter, rtProxy->uniqueID().asUInt() == rt->uniqueID().asUInt());
    } else {
        REPORTER_ASSERT(reporter, rtProxy->uniqueID().asUInt() != rt->uniqueID().asUInt());
    }

    if (SkBackingFit::kExact == fit) {
        REPORTER_ASSERT(reporter, rt->width() == rtProxy->width());
        REPORTER_ASSERT(reporter, rt->height() == rtProxy->height());
    } else {
        REPORTER_ASSERT(reporter, rt->width() >= rtProxy->width());
        REPORTER_ASSERT(reporter, rt->height() >= rtProxy->height());
    }
    REPORTER_ASSERT(reporter, rt->config() == rtProxy->config());

    REPORTER_ASSERT(reporter, rt->fsaaType() == rtProxy->fsaaType());
    REPORTER_ASSERT(reporter, rt->numColorSamples() == rtProxy->numColorSamples());
    REPORTER_ASSERT(reporter, rt->numStencilSamples() == rtProxy->numStencilSamples());
    REPORTER_ASSERT(reporter, rt->surfacePriv().flags() == rtProxy->testingOnly_getFlags());
}

////////////////////////////////////////////////////////////////////////////////
// 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->getClipPathRenderer(gpu, *clipPath, fill, false);
                if (NULL == pr) {
                    fClipMaskInStencil = false;
                    gpu->setClip(clipCopy);     // restore to the original
                    return false;
                }
                canRenderDirectToStencil =
                    !pr->requiresStencilPass(*clipPath, fill, gpu);
//.........这里部分代码省略.........

bool GrGpu::setupClipAndFlushState(GrPrimitiveType type) {
    const GrIRect* r = NULL;
    GrIRect clipRect;

    GrDrawState* drawState = this->drawState();
    GrRenderTarget* rt = drawState->getRenderTarget();

    // GrDrawTarget should have filtered this for us
    GrAssert(NULL != rt);

    if (drawState->isClipState()) {

        GrRect bounds;
        GrRect rtRect;
        rtRect.setLTRB(0, 0,
                       GrIntToScalar(rt->width()), GrIntToScalar(rt->height()));
        if (fClip.hasConservativeBounds()) {
            bounds = fClip.getConservativeBounds();
            if (!bounds.intersect(rtRect)) {
                bounds.setEmpty();
            }
        } else {
            bounds = rtRect;
        }

        bounds.roundOut(&clipRect);
        if  (clipRect.isEmpty()) {
            clipRect.setLTRB(0,0,0,0);
        }
        r = &clipRect;

        // use the stencil clip if we can't represent the clip as a rectangle.
        fClipInStencil = !fClip.isRect() && !fClip.isEmpty() && 
                         !bounds.isEmpty();

        // TODO: dynamically attach a SB when needed.
        GrStencilBuffer* stencilBuffer = rt->getStencilBuffer();
        if (fClipInStencil && NULL == stencilBuffer) {
            return false;
        }

        if (fClipInStencil &&
            stencilBuffer->mustRenderClip(fClip, rt->width(), rt->height())) {

            stencilBuffer->setLastClip(fClip, 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& clip = stencilBuffer->getLastClip();
            fClip.setFromRect(bounds);

            AutoStateRestore asr(this, GrDrawTarget::kReset_ASRInit);
            drawState = this->drawState();
            drawState->setRenderTarget(rt);
            AutoGeometryPush agp(this);

            this->flushScissor(NULL);
#if !VISUALIZE_COMPLEX_CLIP
            drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
#endif

            int count = clip.getElementCount();
            int clipBit = stencilBuffer->bits();
            SkASSERT((clipBit <= 16) &&
                     "Ganesh only handles 16b or smaller stencil buffers");
            clipBit = (1 << (clipBit-1));
            
            bool clearToInside;
            GrSetOp startOp = kReplace_SetOp; // suppress warning
            int start = process_initial_clip_elements(clip,
                                                      rtRect,
                                                      &clearToInside,
                                                      &startOp);

            this->clearStencilClip(clipRect, 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(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.

                GrPathRenderer* pr = NULL;
                const GrPath* clipPath = NULL;
                if (kRect_ClipType == clip.getElementType(c)) {
                    canRenderDirectToStencil = true;
                    fill = kEvenOdd_PathFill;
                    fillInverted = false;
                    // there is no point in intersecting a screen filling
                    // rectangle.
//.........这里部分代码省略.........

////////////////////////////////////////////////////////////////////////////////
// Create a 1-bit clip mask in the stencil buffer. 'devClipBounds' are in device
// (as opposed to canvas) coordinates
bool GrClipMaskManager::createStencilClipMask(InitialState initialState,
        const ElementList& elements,
        const SkIRect& clipSpaceIBounds,
        const SkIPoint& clipSpaceToStencilOffset) {

    GrAssert(kNone_ClipMaskType == fCurrClipMaskType);

    GrDrawState* drawState = fGpu->drawState();
    GrAssert(drawState->isClipState());

    GrRenderTarget* rt = drawState->getRenderTarget();
    GrAssert(NULL != rt);

    // TODO: dynamically attach a SB when needed.
    GrStencilBuffer* stencilBuffer = rt->getStencilBuffer();
    if (NULL == stencilBuffer) {
        return false;
    }
    int32_t genID = elements.tail()->getGenID();

    if (stencilBuffer->mustRenderClip(genID, clipSpaceIBounds, clipSpaceToStencilOffset)) {

        stencilBuffer->setLastClip(genID, clipSpaceIBounds, clipSpaceToStencilOffset);

        GrDrawTarget::AutoStateRestore asr(fGpu, GrDrawTarget::kReset_ASRInit);
        drawState = fGpu->drawState();
        drawState->setRenderTarget(rt);
        GrDrawTarget::AutoGeometryPush agp(fGpu);

        // We set the current clip to the bounds so that our recursive draws are scissored to them.
        SkIRect stencilSpaceIBounds(clipSpaceIBounds);
        stencilSpaceIBounds.offset(clipSpaceToStencilOffset);
        GrDrawTarget::AutoClipRestore acr(fGpu, stencilSpaceIBounds);
        drawState->enableState(GrDrawState::kClip_StateBit);

        // Set the matrix so that rendered clip elements are transformed from clip to stencil space.
        SkVector translate = {
            SkIntToScalar(clipSpaceToStencilOffset.fX),
            SkIntToScalar(clipSpaceToStencilOffset.fY)
        };
        drawState->viewMatrix()->setTranslate(translate);

#if !VISUALIZE_COMPLEX_CLIP
        drawState->enableState(GrDrawState::kNoColorWrites_StateBit);
#endif

        int clipBit = stencilBuffer->bits();
        SkASSERT((clipBit <= 16) && "Ganesh only handles 16b or smaller stencil buffers");
        clipBit = (1 << (clipBit-1));

        GrIRect devRTRect = GrIRect::MakeWH(rt->width(), rt->height());

        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();
            SkPath::FillType 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, 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;

            SkStroke stroke;
            stroke.setDoFill(true);

            SkRegion::Op op = element->getOp();

            GrPathRenderer* pr = NULL;
            SkTCopyOnFirstWrite<SkPath> clipPath;
            if (Element::kRect_Type == element->getType()) {
                stencilSupport = GrPathRenderer::kNoRestriction_StencilSupport;
                fill = SkPath::kEvenOdd_FillType;
                fillInverted = false;
            } else {
                GrAssert(Element::kPath_Type == element->getType());
                clipPath.init(element->getPath());
                fill = clipPath->getFillType();
                fillInverted = clipPath->isInverseFillType();
                if (fillInverted) {
                    clipPath.writable()->toggleInverseFillType();
                    fill = clipPath->getFillType();
                }
                pr = this->getContext()->getPathRenderer(*clipPath,
                        stroke,
                        fGpu,
                        false,
                        GrPathRendererChain::kStencilOnly_DrawType,
                        &stencilSupport);
//.........这里部分代码省略.........

////////////////////////////////////////////////////////////////////////////////
// sort out what kind of clip mask needs to be created: alpha, stencil,
// scissor, or entirely software
bool GrClipMaskManager::setupClipping(GrPipelineBuilder* pipelineBuilder,
                                      GrPipelineBuilder::AutoRestoreFragmentProcessors* arfp,
                                      GrPipelineBuilder::AutoRestoreStencil* ars,
                                      GrScissorState* scissorState,
                                      const SkRect* devBounds) {
    fCurrClipMaskType = kNone_ClipMaskType;
    if (kRespectClip_StencilClipMode == fClipMode) {
        fClipMode = kIgnoreClip_StencilClipMode;
    }

    GrReducedClip::ElementList elements(16);
    int32_t genID = 0;
    GrReducedClip::InitialState initialState = GrReducedClip::kAllIn_InitialState;
    SkIRect clipSpaceIBounds;
    bool requiresAA = false;
    GrRenderTarget* rt = pipelineBuilder->getRenderTarget();

    // GrDrawTarget should have filtered this for us
    SkASSERT(rt);

    SkIRect clipSpaceRTIBounds = SkIRect::MakeWH(rt->width(), rt->height());
    const GrClip& clip = pipelineBuilder->clip();
    if (clip.isWideOpen(clipSpaceRTIBounds)) {
        this->setPipelineBuilderStencil(pipelineBuilder, ars);
        return true;
    }

    // The clip mask manager always draws with a single IRect so we special case that logic here
    // Image filters just use a rect, so we also special case that logic
    switch (clip.clipType()) {
    case GrClip::kWideOpen_ClipType:
        SkFAIL("Should have caught this with clip.isWideOpen()");
        return true;
    case GrClip::kIRect_ClipType: {
        SkIRect scissor = clip.irect();
        if (scissor.intersect(clipSpaceRTIBounds)) {
            scissorState->set(scissor);
            this->setPipelineBuilderStencil(pipelineBuilder, ars);
            return true;
        }
        return false;
    }
    case GrClip::kClipStack_ClipType: {
        clipSpaceRTIBounds.offset(clip.origin());
        GrReducedClip::ReduceClipStack(*clip.clipStack(),
                                       clipSpaceRTIBounds,
                                       &elements,
                                       &genID,
                                       &initialState,
                                       &clipSpaceIBounds,
                                       &requiresAA);
        if (elements.isEmpty()) {
            if (GrReducedClip::kAllIn_InitialState == initialState) {
                if (clipSpaceIBounds == clipSpaceRTIBounds) {
                    this->setPipelineBuilderStencil(pipelineBuilder, ars);
                    return true;
                }
            } else {
                return false;
            }
        }
    }
    break;
    }

    // An element count of 4 was chosen because of the common pattern in Blink of:
    //   isect RR
    //   diff  RR
    //   isect convex_poly
    //   isect convex_poly
    // when drawing rounded div borders. This could probably be tuned based on a
    // configuration's relative costs of switching RTs to generate a mask vs
    // longer shaders.
    if (elements.count() <= 4) {
        SkVector clipToRTOffset = { SkIntToScalar(-clip.origin().fX),
                                    SkIntToScalar(-clip.origin().fY)
                                  };
        if (elements.isEmpty() ||
                (requiresAA && this->installClipEffects(pipelineBuilder, arfp, elements, clipToRTOffset,
                        devBounds))) {
            SkIRect scissorSpaceIBounds(clipSpaceIBounds);
            scissorSpaceIBounds.offset(-clip.origin());
            if (NULL == devBounds ||
                    !SkRect::Make(scissorSpaceIBounds).contains(*devBounds)) {
                scissorState->set(scissorSpaceIBounds);
            }
            this->setPipelineBuilderStencil(pipelineBuilder, ars);
            return true;
        }
    }

    // If MSAA is enabled we can do everything in the stencil buffer.
    if (0 == rt->numSamples() && requiresAA) {
        GrTexture* result = NULL;

        // The top-left of the mask corresponds to the top-left corner of the bounds.
        SkVector clipToMaskOffset = {
//.........这里部分代码省略.........

void GrDrawTarget::drawBatch(const GrPipelineBuilder& pipelineBuilder,
                             const GrClip& clip,
                             GrDrawBatch* batch) {
    // Setup clip
    GrAppliedClip appliedClip;
    if (!clip.apply(fClipMaskManager, pipelineBuilder, &batch->bounds(), &appliedClip)) {
        return;
    }

    GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps;
    if (appliedClip.clipCoverageFragmentProcessor()) {
        arfps.set(&pipelineBuilder);
        arfps.addCoverageFragmentProcessor(appliedClip.clipCoverageFragmentProcessor());
    }

    GrPipeline::CreateArgs args;
    args.fPipelineBuilder = &pipelineBuilder;
    args.fCaps = this->caps();
    args.fScissor = &appliedClip.scissorState();
    args.fHasStencilClip = appliedClip.hasStencilClip();
    if (pipelineBuilder.hasUserStencilSettings() || appliedClip.hasStencilClip()) {
        if (!fResourceProvider->attachStencilAttachment(pipelineBuilder.getRenderTarget())) {
            SkDebugf("ERROR creating stencil attachment. Draw skipped.\n");
            return;
        }
    }
    batch->getPipelineOptimizations(&args.fOpts);
    GrScissorState finalScissor;
    if (args.fOpts.fOverrides.fUsePLSDstRead || fClipBatchToBounds) {
        GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
        GrGLIRect viewport;
        viewport.fLeft = 0;
        viewport.fBottom = 0;
        viewport.fWidth = rt->width();
        viewport.fHeight = rt->height();
        SkIRect ibounds;
        ibounds.fLeft = SkTPin(SkScalarFloorToInt(batch->bounds().fLeft), viewport.fLeft,
                              viewport.fWidth);
        ibounds.fTop = SkTPin(SkScalarFloorToInt(batch->bounds().fTop), viewport.fBottom,
                             viewport.fHeight);
        ibounds.fRight = SkTPin(SkScalarCeilToInt(batch->bounds().fRight), viewport.fLeft,
                               viewport.fWidth);
        ibounds.fBottom = SkTPin(SkScalarCeilToInt(batch->bounds().fBottom), viewport.fBottom,
                                viewport.fHeight);
        if (appliedClip.scissorState().enabled()) {
            const SkIRect& scissorRect = appliedClip.scissorState().rect();
            if (!ibounds.intersect(scissorRect)) {
                return;
            }
        }
        finalScissor.set(ibounds);
        args.fScissor = &finalScissor;
    }
    args.fOpts.fColorPOI.completeCalculations(pipelineBuilder.fColorFragmentProcessors.begin(),
                                              pipelineBuilder.numColorFragmentProcessors());
    args.fOpts.fCoveragePOI.completeCalculations(
                                               pipelineBuilder.fCoverageFragmentProcessors.begin(),
                                               pipelineBuilder.numCoverageFragmentProcessors());
    if (!this->setupDstReadIfNecessary(pipelineBuilder, clip, args.fOpts, &args.fDstTexture,
                                       batch->bounds())) {
        return;
    }

    if (!batch->installPipeline(args)) {
        return;
    }

#ifdef ENABLE_MDB
    SkASSERT(fRenderTarget);
    batch->pipeline()->addDependenciesTo(fRenderTarget);
#endif

    this->recordBatch(batch);
}

////////////////////////////////////////////////////////////////////////////////
// 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 (create_mask_in_sw()) {
        // 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;
        }
    }
#endif

#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 (clipIn.requiresAA() && 0 == rt->numSamples()) {
        // 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

    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;
}

////////////////////////////////////////////////////////////////////////////////
// sort out what kind of clip mask needs to be created: alpha, stencil,
// scissor, or entirely software
bool GrClipMaskManager::setupClipping(const GrPipelineBuilder& pipelineBuilder,
                                      GrPipelineBuilder::AutoRestoreStencil* ars,
                                      GrScissorState* scissorState,
                                      const SkRect* devBounds,
                                      GrAppliedClip* out) {
    if (kRespectClip_StencilClipMode == fClipMode) {
        fClipMode = kIgnoreClip_StencilClipMode;
    }

    GrReducedClip::ElementList elements(16);
    int32_t genID = 0;
    GrReducedClip::InitialState initialState = GrReducedClip::kAllIn_InitialState;
    SkIRect clipSpaceIBounds;
    bool requiresAA = false;
    GrRenderTarget* rt = pipelineBuilder.getRenderTarget();

    // GrDrawTarget should have filtered this for us
    SkASSERT(rt);

    SkIRect clipSpaceRTIBounds = SkIRect::MakeWH(rt->width(), rt->height());
    const GrClip& clip = pipelineBuilder.clip();
    if (clip.isWideOpen(clipSpaceRTIBounds)) {
        this->setPipelineBuilderStencil(pipelineBuilder, ars);
        return true;
    }

    // The clip mask manager always draws with a single IRect so we special case that logic here
    // Image filters just use a rect, so we also special case that logic
    switch (clip.clipType()) {
        case GrClip::kWideOpen_ClipType:
            SkFAIL("Should have caught this with clip.isWideOpen()");
            return true;
        case GrClip::kIRect_ClipType: {
            SkIRect scissor = clip.irect();
            if (scissor.intersect(clipSpaceRTIBounds)) {
                scissorState->set(scissor);
                this->setPipelineBuilderStencil(pipelineBuilder, ars);
                return true;
            }
            return false;
        }
        case GrClip::kClipStack_ClipType: {
            clipSpaceRTIBounds.offset(clip.origin());
            GrReducedClip::ReduceClipStack(*clip.clipStack(),
                                            clipSpaceRTIBounds,
                                            &elements,
                                            &genID,
                                            &initialState,
                                            &clipSpaceIBounds,
                                            &requiresAA);
            if (elements.isEmpty()) {
                if (GrReducedClip::kAllIn_InitialState == initialState) {
                    if (clipSpaceIBounds == clipSpaceRTIBounds) {
                        this->setPipelineBuilderStencil(pipelineBuilder, ars);
                        return true;
                    }
                } else {
                    return false;
                }
            }
        } break;
    }

    // An element count of 4 was chosen because of the common pattern in Blink of:
    //   isect RR
    //   diff  RR
    //   isect convex_poly
    //   isect convex_poly
    // when drawing rounded div borders. This could probably be tuned based on a
    // configuration's relative costs of switching RTs to generate a mask vs
    // longer shaders.
    if (elements.count() <= kMaxAnalyticElements) {
        SkVector clipToRTOffset = { SkIntToScalar(-clip.origin().fX),
                                    SkIntToScalar(-clip.origin().fY) };
        // When there are multiple color samples we want to do per-sample clipping, not compute
        // a fractional pixel coverage.
        bool disallowAnalyticAA = pipelineBuilder.getRenderTarget()->isUnifiedMultisampled();
        const GrFragmentProcessor* clipFP = nullptr;
        if (elements.isEmpty() ||
            (requiresAA && !disallowAnalyticAA &&
             SkToBool(clipFP = this->getAnalyticClipProcessor(elements, clipToRTOffset, devBounds)))) {
            SkIRect scissorSpaceIBounds(clipSpaceIBounds);
            scissorSpaceIBounds.offset(-clip.origin());
            if (nullptr == devBounds ||
                !SkRect::Make(scissorSpaceIBounds).contains(*devBounds)) {
                scissorState->set(scissorSpaceIBounds);
            }
            this->setPipelineBuilderStencil(pipelineBuilder, ars);
            out->fClipCoverageFP.reset(clipFP);
            return true;
        }
    }

    // If MSAA is enabled we can do everything in the stencil buffer.
    if (0 == rt->numStencilSamples() && requiresAA) {
        SkAutoTUnref<GrTexture> result;

//.........这里部分代码省略.........