C++ SkIRect::intersect方法代码示例

////////////////////////////////////////////////////////////////////////////////
// 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.........

bool GrDrawTarget::setupDstReadIfNecessary(const GrPipelineBuilder& pipelineBuilder,
                                           const GrProcOptInfo& colorPOI,
                                           const GrProcOptInfo& coveragePOI,
                                           GrXferProcessor::DstTexture* dstTexture,
                                           const SkRect* drawBounds) {
    if (!pipelineBuilder.willXPNeedDstTexture(*this->caps(), colorPOI, coveragePOI)) {
        return true;
    }

    GrRenderTarget* rt = pipelineBuilder.getRenderTarget();

    if (this->caps()->textureBarrierSupport()) {
        if (GrTexture* rtTex = rt->asTexture()) {
            // The render target is a texture, so we can read from it directly in the shader. The XP
            // will be responsible to detect this situation and request a texture barrier.
            dstTexture->setTexture(rtTex);
            dstTexture->setOffset(0, 0);
            return true;
        }
    }

    SkIRect copyRect;
    pipelineBuilder.clip().getConservativeBounds(rt, &copyRect);

    if (drawBounds) {
        SkIRect drawIBounds;
        drawBounds->roundOut(&drawIBounds);
        if (!copyRect.intersect(drawIBounds)) {
#ifdef SK_DEBUG
            GrCapsDebugf(fCaps, "Missed an early reject. "
                         "Bailing on draw from setupDstReadIfNecessary.\n");
#endif
            return false;
        }
    } else {
#ifdef SK_DEBUG
        //SkDebugf("No dev bounds when dst copy is made.\n");
#endif
    }

    // MSAA consideration: When there is support for reading MSAA samples in the shader we could
    // have per-sample dst values by making the copy multisampled.
    GrSurfaceDesc desc;
    if (!this->getGpu()->initCopySurfaceDstDesc(rt, &desc)) {
        desc.fOrigin = kDefault_GrSurfaceOrigin;
        desc.fFlags = kRenderTarget_GrSurfaceFlag;
        desc.fConfig = rt->config();
    }


    desc.fWidth = copyRect.width();
    desc.fHeight = copyRect.height();

    SkAutoTUnref<GrTexture> copy(
        fResourceProvider->refScratchTexture(desc, GrTextureProvider::kApprox_ScratchTexMatch));

    if (!copy) {
        SkDebugf("Failed to create temporary copy of destination texture.\n");
        return false;
    }
    SkIPoint dstPoint = {0, 0};
    this->copySurface(copy, rt, copyRect, dstPoint);
    dstTexture->setTexture(copy);
    dstTexture->setOffset(copyRect.fLeft, copyRect.fTop);
    return true;
}

void draw(SkCanvas* canvas) {
    SkIRect result;
    bool intersected = result.intersect({ 10, 40, 50, 80 }, { 30, 60, 70, 90 });
    SkDebugf("%s intersection: %d, %d, %d, %d\n", intersected ? "" : "no ",
             result.left(), result.top(), result.right(), result.bottom());
}

static void blitClippedRect(SkBlitter* blitter, const SkIRect& rect, const SkIRect& clipR) {
    SkIRect r;
    if (r.intersect(rect, clipR)) {
        blitter->blitRect(r.left(), r.top(), r.width(), r.height());
    }
}

static void draw_nine_clipped(const SkMask& mask, const SkIRect& outerR,
                              const SkIPoint& center, bool fillCenter,
                              const SkIRect& clipR, SkBlitter* blitter) {
    int cx = center.x();
    int cy = center.y();
    SkMask m;

    // top-left
    m.fBounds = mask.fBounds;
    m.fBounds.fRight = cx;
    m.fBounds.fBottom = cy;
    if (m.fBounds.width() > 0 && m.fBounds.height() > 0) {
        extractMaskSubset(mask, &m);
        m.fBounds.offsetTo(outerR.left(), outerR.top());
        blitClippedMask(blitter, m, m.fBounds, clipR);
    }

    // top-right
    m.fBounds = mask.fBounds;
    m.fBounds.fLeft = cx + 1;
    m.fBounds.fBottom = cy;
    if (m.fBounds.width() > 0 && m.fBounds.height() > 0) {
        extractMaskSubset(mask, &m);
        m.fBounds.offsetTo(outerR.right() - m.fBounds.width(), outerR.top());
        blitClippedMask(blitter, m, m.fBounds, clipR);
    }

    // bottom-left
    m.fBounds = mask.fBounds;
    m.fBounds.fRight = cx;
    m.fBounds.fTop = cy + 1;
    if (m.fBounds.width() > 0 && m.fBounds.height() > 0) {
        extractMaskSubset(mask, &m);
        m.fBounds.offsetTo(outerR.left(), outerR.bottom() - m.fBounds.height());
        blitClippedMask(blitter, m, m.fBounds, clipR);
    }

    // bottom-right
    m.fBounds = mask.fBounds;
    m.fBounds.fLeft = cx + 1;
    m.fBounds.fTop = cy + 1;
    if (m.fBounds.width() > 0 && m.fBounds.height() > 0) {
        extractMaskSubset(mask, &m);
        m.fBounds.offsetTo(outerR.right() - m.fBounds.width(),
                           outerR.bottom() - m.fBounds.height());
        blitClippedMask(blitter, m, m.fBounds, clipR);
    }

    SkIRect innerR;
    innerR.set(outerR.left() + cx - mask.fBounds.left(),
               outerR.top() + cy - mask.fBounds.top(),
               outerR.right() + (cx + 1 - mask.fBounds.right()),
               outerR.bottom() + (cy + 1 - mask.fBounds.bottom()));
    if (fillCenter) {
        blitClippedRect(blitter, innerR, clipR);
    }

    const int innerW = innerR.width();
    size_t storageSize = (innerW + 1) * (sizeof(int16_t) + sizeof(uint8_t));
    SkAutoSMalloc<4*1024> storage(storageSize);
    int16_t* runs = (int16_t*)storage.get();
    uint8_t* alpha = (uint8_t*)(runs + innerW + 1);

    SkIRect r;
    // top
    r.set(innerR.left(), outerR.top(), innerR.right(), innerR.top());
    if (r.intersect(clipR)) {
        int startY = SkMax32(0, r.top() - outerR.top());
        int stopY = startY + r.height();
        int width = r.width();
        for (int y = startY; y < stopY; ++y) {
            runs[0] = width;
            runs[width] = 0;
            alpha[0] = *mask.getAddr8(cx, mask.fBounds.top() + y);
            blitter->blitAntiH(r.left(), outerR.top() + y, alpha, runs);
        }
    }
    // bottom
    r.set(innerR.left(), innerR.bottom(), innerR.right(), outerR.bottom());
    if (r.intersect(clipR)) {
        int startY = outerR.bottom() - r.bottom();
        int stopY = startY + r.height();
        int width = r.width();
        for (int y = startY; y < stopY; ++y) {
            runs[0] = width;
            runs[width] = 0;
            alpha[0] = *mask.getAddr8(cx, mask.fBounds.bottom() - y - 1);
            blitter->blitAntiH(r.left(), outerR.bottom() - y - 1, alpha, runs);
        }
    }
    // left
    r.set(outerR.left(), innerR.top(), innerR.left(), innerR.bottom());
    if (r.intersect(clipR)) {
        int startX = r.left() - outerR.left();
        int stopX = startX + r.width();
        int height = r.height();
        for (int x = startX; x < stopX; ++x) {
            blitter->blitV(outerR.left() + x, r.top(), height,
                           *mask.getAddr8(mask.fBounds.left() + x, mask.fBounds.top() + cy));
        }
//.........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::setupClipping(const GrPipelineBuilder& pipelineBuilder,
                                      GrPipelineBuilder::AutoRestoreStencil* ars,
                                      const SkRect* devBounds,
                                      GrAppliedClip* out) {
    if (kRespectClip_StencilClipMode == fClipMode) {
        fClipMode = kIgnoreClip_StencilClipMode;
    }

    GrReducedClip::ElementList elements;
    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());
    GrClip devBoundsClip;
    bool doDevBoundsClip = fDebugClipBatchToBounds && devBounds;
    if (doDevBoundsClip) {
        add_rect_to_clip(pipelineBuilder.clip(), *devBounds, &devBoundsClip);
    }
    const GrClip& clip = doDevBoundsClip ? devBoundsClip : 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)) {
                out->fScissorState.set(scissor);
                this->setPipelineBuilderStencil(pipelineBuilder, ars);
                return true;
            }
            return false;
        }
        case GrClip::kClipStack_ClipType: {
            clipSpaceRTIBounds.offset(clip.origin());
            SkIRect clipSpaceReduceQueryBounds;
#define DISABLE_DEV_BOUNDS_FOR_CLIP_REDUCTION 0
            if (devBounds && !DISABLE_DEV_BOUNDS_FOR_CLIP_REDUCTION) {
                SkIRect devIBounds = devBounds->roundOut();
                devIBounds.offset(clip.origin());
                if (!clipSpaceReduceQueryBounds.intersect(clipSpaceRTIBounds, devIBounds)) {
                    return false;
                }
            } else {
                clipSpaceReduceQueryBounds = clipSpaceRTIBounds;
            }
            GrReducedClip::ReduceClipStack(*clip.clipStack(),
                                            clipSpaceReduceQueryBounds,
                                            &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 samples we want to do per-sample clipping, not compute a
        // fractional pixel coverage.
        bool disallowAnalyticAA = rt->isUnifiedMultisampled() || pipelineBuilder.hasMixedSamples();
        const GrFragmentProcessor* clipFP = nullptr;
        if (elements.isEmpty() ||
            (requiresAA &&
             this->getAnalyticClipProcessor(elements, disallowAnalyticAA, clipToRTOffset, devBounds,
//.........这里部分代码省略.........

bool SkDisplacementMapEffect::filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context& ctx,
                                             SkBitmap* result, SkIPoint* offset) const {
    SkBitmap colorBM = src;
    SkIPoint colorOffset = SkIPoint::Make(0, 0);
    if (getColorInput() && !getColorInput()->getInputResultGPU(proxy, src, ctx, &colorBM,
                                                               &colorOffset)) {
        return false;
    }
    SkBitmap displacementBM = src;
    SkIPoint displacementOffset = SkIPoint::Make(0, 0);
    if (getDisplacementInput() &&
        !getDisplacementInput()->getInputResultGPU(proxy, src, ctx, &displacementBM,
                                                   &displacementOffset)) {
        return false;
    }
    SkIRect bounds;
    // Since GrDisplacementMapEffect does bounds checking on color pixel access, we don't need to
    // pad the color bitmap to bounds here.
    if (!this->applyCropRect(ctx, colorBM, colorOffset, &bounds)) {
        return false;
    }
    SkIRect displBounds;
    if (!this->applyCropRect(ctx, proxy, displacementBM,
                             &displacementOffset, &displBounds, &displacementBM)) {
        return false;
    }
    if (!bounds.intersect(displBounds)) {
        return false;
    }
    GrTexture* color = colorBM.getTexture();
    GrTexture* displacement = displacementBM.getTexture();
    GrContext* context = color->getContext();

    GrSurfaceDesc desc;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = bounds.width();
    desc.fHeight = bounds.height();
    desc.fConfig = kSkia8888_GrPixelConfig;

    SkAutoTUnref<GrTexture> dst(context->textureProvider()->refScratchTexture(desc,
        GrTextureProvider::kApprox_ScratchTexMatch));

    if (!dst) {
        return false;
    }

    SkVector scale = SkVector::Make(fScale, fScale);
    ctx.ctm().mapVectors(&scale, 1);

    GrPaint paint;
    SkMatrix offsetMatrix = GrCoordTransform::MakeDivByTextureWHMatrix(displacement);
    offsetMatrix.preTranslate(SkIntToScalar(colorOffset.fX - displacementOffset.fX),
                              SkIntToScalar(colorOffset.fY - displacementOffset.fY));

    paint.addColorProcessor(
        GrDisplacementMapEffect::Create(fXChannelSelector,
                                        fYChannelSelector,
                                        scale,
                                        displacement,
                                        offsetMatrix,
                                        color,
                                        colorBM.dimensions()))->unref();
    SkIRect colorBounds = bounds;
    colorBounds.offset(-colorOffset);
    SkMatrix matrix;
    matrix.setTranslate(-SkIntToScalar(colorBounds.x()),
                        -SkIntToScalar(colorBounds.y()));
    context->drawRect(dst->asRenderTarget(), GrClip::WideOpen(), paint, matrix,
                      SkRect::Make(colorBounds));
    offset->fX = bounds.left();
    offset->fY = bounds.top();
    WrapTexture(dst, bounds.width(), bounds.height(), result);
    return true;
}

bool GrDrawTarget::setupDstReadIfNecessary(const GrPipelineBuilder& pipelineBuilder,
                                           const GrClip& clip,
                                           const GrPipelineOptimizations& optimizations,
                                           GrXferProcessor::DstTexture* dstTexture,
                                           const SkRect& batchBounds) {
    SkRect bounds = batchBounds;
    bounds.outset(0.5f, 0.5f);

    if (!pipelineBuilder.willXPNeedDstTexture(*this->caps(), optimizations)) {
        return true;
    }

    GrRenderTarget* rt = pipelineBuilder.getRenderTarget();

    if (this->caps()->textureBarrierSupport()) {
        if (GrTexture* rtTex = rt->asTexture()) {
            // The render target is a texture, so we can read from it directly in the shader. The XP
            // will be responsible to detect this situation and request a texture barrier.
            dstTexture->setTexture(rtTex);
            dstTexture->setOffset(0, 0);
            return true;
        }
    }

    SkIRect copyRect;
    clip.getConservativeBounds(rt->width(), rt->height(), &copyRect);

    SkIRect drawIBounds;
    bounds.roundOut(&drawIBounds);
    if (!copyRect.intersect(drawIBounds)) {
#ifdef SK_DEBUG
        GrCapsDebugf(this->caps(), "Missed an early reject. "
                                   "Bailing on draw from setupDstReadIfNecessary.\n");
#endif
        return false;
    }

    // MSAA consideration: When there is support for reading MSAA samples in the shader we could
    // have per-sample dst values by making the copy multisampled.
    GrSurfaceDesc desc;
    if (!fGpu->initCopySurfaceDstDesc(rt, &desc)) {
        desc.fOrigin = kDefault_GrSurfaceOrigin;
        desc.fFlags = kRenderTarget_GrSurfaceFlag;
        desc.fConfig = rt->config();
    }

    desc.fWidth = copyRect.width();
    desc.fHeight = copyRect.height();

    static const uint32_t kFlags = 0;
    SkAutoTUnref<GrTexture> copy(fResourceProvider->createApproxTexture(desc, kFlags));

    if (!copy) {
        SkDebugf("Failed to create temporary copy of destination texture.\n");
        return false;
    }
    SkIPoint dstPoint = {0, 0};
    this->copySurface(copy, rt, copyRect, dstPoint);
    dstTexture->setTexture(copy);
    dstTexture->setOffset(copyRect.fLeft, copyRect.fTop);
    return true;
}

bool SkJPEGImageDecoder::onDecodeRegion(SkBitmap* bm, SkIRect region) {
    if (index == NULL) {
        return false;
    }
    jpeg_decompress_struct *cinfo = index->cinfo;

    SkIRect rect = SkIRect::MakeWH(this->imageWidth, this->imageHeight);
    if (!rect.intersect(region)) {
        // If the requested region is entirely outsides the image, just
        // returns false
        return false;
    }
    SkAutoMalloc  srcStorage;
    skjpeg_error_mgr        sk_err;
    cinfo->err = jpeg_std_error(&sk_err);
    sk_err.error_exit = skjpeg_error_exit;
    if (setjmp(sk_err.fJmpBuf)) {
        return false;
    }
    int requestedSampleSize = this->getSampleSize();
    cinfo->scale_denom = requestedSampleSize;

    if (this->getPreferQualityOverSpeed()) {
        cinfo->dct_method = JDCT_ISLOW;
    } else {
        cinfo->dct_method = JDCT_IFAST;
    }

    SkBitmap::Config config = this->getPrefConfig(k32Bit_SrcDepth, false);
    if (config != SkBitmap::kARGB_8888_Config &&
        config != SkBitmap::kARGB_4444_Config &&
        config != SkBitmap::kRGB_565_Config) {
        config = SkBitmap::kARGB_8888_Config;
    }

    /* default format is RGB */
    cinfo->out_color_space = JCS_RGB;

#ifdef ANDROID_RGB
    cinfo->dither_mode = JDITHER_NONE;
    if (config == SkBitmap::kARGB_8888_Config) {
        cinfo->out_color_space = JCS_RGBA_8888;
    } else if (config == SkBitmap::kRGB_565_Config) {
        cinfo->out_color_space = JCS_RGB_565;
        if (this->getDitherImage()) {
            cinfo->dither_mode = JDITHER_ORDERED;
        }
    }
#endif
    int startX = rect.fLeft;
    int startY = rect.fTop;
    int width = rect.width();
    int height = rect.height();

    jpeg_init_read_tile_scanline(cinfo, index->index,
                                 &startX, &startY, &width, &height);
    int skiaSampleSize = recompute_sampleSize(requestedSampleSize, *cinfo);
    int actualSampleSize = skiaSampleSize * (DCTSIZE / cinfo->min_DCT_scaled_size);

    SkBitmap *bitmap = new SkBitmap;
    SkAutoTDelete<SkBitmap> adb(bitmap);

#ifdef ANDROID_RGB
    /* short-circuit the SkScaledBitmapSampler when possible, as this gives
       a significant performance boost.
    */
    if (skiaSampleSize == 1 &&
        ((config == SkBitmap::kARGB_8888_Config &&
                cinfo->out_color_space == JCS_RGBA_8888) ||
        (config == SkBitmap::kRGB_565_Config &&
                cinfo->out_color_space == JCS_RGB_565)))
    {
        bitmap->setConfig(config, cinfo->output_width, height);
        bitmap->setIsOpaque(true);

        // Check ahead of time if the swap(dest, src) is possible or not.
        // If yes, then we will stick to AllocPixelRef since it's cheaper
        // with the swap happening. If no, then we will use alloc to allocate
        // pixels to prevent garbage collection.
        //
        // Not using a recycled-bitmap and the output rect is same as the
        // decoded region.
        int w = rect.width() / actualSampleSize;
        int h = rect.height() / actualSampleSize;
        bool swapOnly = (rect == region) && bm->isNull() &&
                        (w == bitmap->width()) && (h == bitmap->height()) &&
                        ((startX - rect.x()) / actualSampleSize == 0) &&
                        ((startY - rect.y()) / actualSampleSize == 0);
        if (swapOnly) {
            if (!this->allocPixelRef(bitmap, NULL)) {
                return return_false(*cinfo, *bitmap, "allocPixelRef");
            }
        } else {
            if (!bitmap->allocPixels()) {
                return return_false(*cinfo, *bitmap, "allocPixels");
            }
        }

        SkAutoLockPixels alp(*bitmap);
        JSAMPLE* rowptr = (JSAMPLE*)bitmap->getPixels();
//.........这里部分代码省略.........

DEF_GPUTEST_FOR_RENDERING_CONTEXTS(CopySurface, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();
    static const int kW = 10;
    static const int kH = 10;
    static const size_t kRowBytes = sizeof(uint32_t) * kW;

    GrSurfaceDesc baseDesc;
    baseDesc.fConfig = kRGBA_8888_GrPixelConfig;
    baseDesc.fWidth = kW;
    baseDesc.fHeight = kH;

    SkAutoTMalloc<uint32_t> srcPixels(kW * kH);
    for (int i = 0; i < kW * kH; ++i) {
        srcPixels.get()[i] = i;
    }

    SkAutoTMalloc<uint32_t> dstPixels(kW * kH);
    for (int i = 0; i < kW * kH; ++i) {
        dstPixels.get()[i] = ~i;
    }

    static const SkIRect kSrcRects[] {
        { 0,  0, kW  , kH  },
        {-1, -1, kW+1, kH+1},
        { 1,  1, kW-1, kH-1},
        { 5,  5, 6   , 6   },
    };

    static const SkIPoint kDstPoints[] {
        { 0   ,  0   },
        { 1   ,  1   },
        { kW/2,  kH/4},
        { kW-1,  kH-1},
        { kW  ,  kH  },
        { kW+1,  kH+2},
        {-1   , -1   },
    };

    SkAutoTMalloc<uint32_t> read(kW * kH);

    for (auto sOrigin : {kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin}) {
        for (auto dOrigin : {kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin}) {
            for (auto sFlags: {kRenderTarget_GrSurfaceFlag, kNone_GrSurfaceFlags}) {
                for (auto dFlags: {kRenderTarget_GrSurfaceFlag, kNone_GrSurfaceFlags}) {
                    for (auto srcRect : kSrcRects) {
                        for (auto dstPoint : kDstPoints) {
                            GrSurfaceDesc srcDesc = baseDesc;
                            srcDesc.fOrigin = sOrigin;
                            srcDesc.fFlags = sFlags;
                            GrSurfaceDesc dstDesc = baseDesc;
                            dstDesc.fOrigin = dOrigin;
                            dstDesc.fFlags = dFlags;

                            SkAutoTUnref<GrTexture> src(
                                context->textureProvider()->createTexture(srcDesc, SkBudgeted::kNo,
                                                                          srcPixels.get(),
                                                                          kRowBytes));
                            SkAutoTUnref<GrTexture> dst(
                                context->textureProvider()->createTexture(dstDesc, SkBudgeted::kNo,
                                                                          dstPixels.get(),
                                                                          kRowBytes));
                            if (!src || !dst) {
                                ERRORF(reporter,
                                       "Could not create surfaces for copy surface test.");
                                continue;
                            }

                            bool result = context->copySurface(dst, src, srcRect, dstPoint);

                            bool expectedResult = true;
                            SkIPoint dstOffset = { dstPoint.fX - srcRect.fLeft,
                                                   dstPoint.fY - srcRect.fTop };
                            SkIRect copiedDstRect = SkIRect::MakeXYWH(dstPoint.fX,
                                                                      dstPoint.fY,
                                                                      srcRect.width(),
                                                                      srcRect.height());

                            SkIRect copiedSrcRect;
                            if (!copiedSrcRect.intersect(srcRect, SkIRect::MakeWH(kW, kH))) {
                                expectedResult = false;
                            } else {
                                // If the src rect was clipped, apply same clipping to each side of
                                // copied dst rect.
                                copiedDstRect.fLeft += copiedSrcRect.fLeft - srcRect.fLeft;
                                copiedDstRect.fTop += copiedSrcRect.fTop - srcRect.fTop;
                                copiedDstRect.fRight -= copiedSrcRect.fRight - srcRect.fRight;
                                copiedDstRect.fBottom -= copiedSrcRect.fBottom - srcRect.fBottom;
                            }
                            if (copiedDstRect.isEmpty() ||
                                !copiedDstRect.intersect(SkIRect::MakeWH(kW, kH))) {
                                expectedResult = false;
                            }
                            // To make the copied src rect correct we would apply any dst clipping
                            // back to the src rect, but we don't use it again so don't bother.
                            if (expectedResult != result) {
                                ERRORF(reporter, "Expected return value %d from copySurface, got "
                                       "%d.", expectedResult, result);
                                continue;
                            }

//.........这里部分代码省略.........

bool SkBlurImageFilter::onFilterImage(Proxy* proxy,
                                      const SkBitmap& source, const Context& ctx,
                                      SkBitmap* dst, SkIPoint* offset) const {
    SkBitmap src = source;
    SkIPoint srcOffset = SkIPoint::Make(0, 0);
    if (!this->filterInput(0, proxy, source, ctx, &src, &srcOffset)) {
        return false;
    }

    if (src.colorType() != kN32_SkColorType) {
        return false;
    }

    SkIRect srcBounds = src.bounds();
    srcBounds.offset(srcOffset);
    SkIRect dstBounds;
    if (!this->applyCropRect(this->mapContext(ctx), srcBounds, &dstBounds)) {
        return false;
    }
    if (!srcBounds.intersect(dstBounds)) {
        return false;
    }

    SkVector sigma = map_sigma(fSigma, ctx.ctm());

    int kernelSizeX, kernelSizeX3, lowOffsetX, highOffsetX;
    int kernelSizeY, kernelSizeY3, lowOffsetY, highOffsetY;
    getBox3Params(sigma.x(), &kernelSizeX, &kernelSizeX3, &lowOffsetX, &highOffsetX);
    getBox3Params(sigma.y(), &kernelSizeY, &kernelSizeY3, &lowOffsetY, &highOffsetY);

    if (kernelSizeX < 0 || kernelSizeY < 0) {
        return false;
    }

    if (kernelSizeX == 0 && kernelSizeY == 0) {
        src.extractSubset(dst, srcBounds);
        offset->fX = srcBounds.x();
        offset->fY = srcBounds.y();
        return true;
    }

    SkAutoLockPixels alp(src);
    if (!src.getPixels()) {
        return false;
    }

    SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstBounds.width(), dstBounds.height()));
    if (!device) {
        return false;
    }
    *dst = device->accessBitmap(false);
    SkAutoLockPixels alp_dst(*dst);

    SkAutoTUnref<SkBaseDevice> tempDevice(proxy->createDevice(dst->width(), dst->height()));
    if (!tempDevice) {
        return false;
    }
    SkBitmap temp = tempDevice->accessBitmap(false);
    SkAutoLockPixels alpTemp(temp);

    offset->fX = dstBounds.fLeft;
    offset->fY = dstBounds.fTop;
    SkPMColor* t = temp.getAddr32(0, 0);
    SkPMColor* d = dst->getAddr32(0, 0);
    int w = dstBounds.width(), h = dstBounds.height();
    const SkPMColor* s = src.getAddr32(srcBounds.x() - srcOffset.x(), srcBounds.y() - srcOffset.y());
    srcBounds.offset(-dstBounds.x(), -dstBounds.y());
    dstBounds.offset(-dstBounds.x(), -dstBounds.y());
    SkIRect srcBoundsT = SkIRect::MakeLTRB(srcBounds.top(), srcBounds.left(), srcBounds.bottom(), srcBounds.right());
    SkIRect dstBoundsT = SkIRect::MakeWH(dstBounds.height(), dstBounds.width());
    int sw = src.rowBytesAsPixels();

    /**
     *
     * In order to make memory accesses cache-friendly, we reorder the passes to
     * use contiguous memory reads wherever possible.
     *
     * For example, the 6 passes of the X-and-Y blur case are rewritten as
     * follows. Instead of 3 passes in X and 3 passes in Y, we perform
     * 2 passes in X, 1 pass in X transposed to Y on write, 2 passes in X,
     * then 1 pass in X transposed to Y on write.
     *
     * +----+       +----+       +----+        +---+       +---+       +---+        +----+
     * + AB + ----> | AB | ----> | AB | -----> | A | ----> | A | ----> | A | -----> | AB |
     * +----+ blurX +----+ blurX +----+ blurXY | B | blurX | B | blurX | B | blurXY +----+
     *                                         +---+       +---+       +---+
     *
     * In this way, two of the y-blurs become x-blurs applied to transposed
     * images, and all memory reads are contiguous.
     */
    if (kernelSizeX > 0 && kernelSizeY > 0) {
        SkOpts::box_blur_xx(s, sw,  srcBounds,  t, kernelSizeX,  lowOffsetX,  highOffsetX, w, h);
        SkOpts::box_blur_xx(t,  w,  dstBounds,  d, kernelSizeX,  highOffsetX, lowOffsetX,  w, h);
        SkOpts::box_blur_xy(d,  w,  dstBounds,  t, kernelSizeX3, highOffsetX, highOffsetX, w, h);
        SkOpts::box_blur_xx(t,  h,  dstBoundsT, d, kernelSizeY,  lowOffsetY,  highOffsetY, h, w);
        SkOpts::box_blur_xx(d,  h,  dstBoundsT, t, kernelSizeY,  highOffsetY, lowOffsetY,  h, w);
        SkOpts::box_blur_xy(t,  h,  dstBoundsT, d, kernelSizeY3, highOffsetY, highOffsetY, h, w);
    } else if (kernelSizeX > 0) {
        SkOpts::box_blur_xx(s, sw,  srcBounds,  d, kernelSizeX,  lowOffsetX,  highOffsetX, w, h);
        SkOpts::box_blur_xx(d,  w,  dstBounds,  t, kernelSizeX,  highOffsetX, lowOffsetX,  w, h);
//.........这里部分代码省略.........

void SkBitmapDevice::writePixels(const SkBitmap& bitmap,
                                 int x, int y,
                                 SkCanvas::Config8888 config8888) {
    if (bitmap.isNull() || bitmap.getTexture()) {
        return;
    }
    const SkBitmap* sprite = &bitmap;
    // check whether we have to handle a config8888 that doesn't match SkPMColor
    if (SkBitmap::kARGB_8888_Config == bitmap.config() &&
        SkCanvas::kNative_Premul_Config8888 != config8888 &&
        kPMColorAlias != config8888) {

        // We're going to have to convert from a config8888 to the native config
        // First we clip to the device bounds.
        SkBitmap dstBmp = this->accessBitmap(true);
        SkIRect spriteRect = SkIRect::MakeXYWH(x, y,
                                               bitmap.width(), bitmap.height());
        SkIRect devRect = SkIRect::MakeWH(dstBmp.width(), dstBmp.height());
        if (!spriteRect.intersect(devRect)) {
            return;
        }

        // write directly to the device if it has pixels and is SkPMColor
        bool drawSprite;
        if (SkBitmap::kARGB_8888_Config == dstBmp.config() && !dstBmp.isNull()) {
            // we can write directly to the dst when doing the conversion
            dstBmp.extractSubset(&dstBmp, spriteRect);
            drawSprite = false;
        } else {
            // we convert to a temporary bitmap and draw that as a sprite
            dstBmp.setConfig(SkBitmap::kARGB_8888_Config,
                             spriteRect.width(),
                             spriteRect.height());
            if (!dstBmp.allocPixels()) {
                return;
            }
            drawSprite = true;
        }

        // copy pixels to dstBmp and convert from config8888 to native config.
        SkAutoLockPixels alp(bitmap);
        uint32_t* srcPixels = bitmap.getAddr32(spriteRect.fLeft - x,
                                               spriteRect.fTop - y);
        SkCopyConfig8888ToBitmap(dstBmp,
                                 srcPixels,
                                 bitmap.rowBytes(),
                                 config8888);

        if (drawSprite) {
            // we've clipped the sprite when we made a copy
            x = spriteRect.fLeft;
            y = spriteRect.fTop;
            sprite = &dstBmp;
        } else {
            return;
        }
    }

    SkPaint paint;
    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
    SkRasterClip clip(SkIRect::MakeWH(fBitmap.width(), fBitmap.height()));
    SkDraw  draw;
    draw.fRC = &clip;
    draw.fClip = &clip.bwRgn();
    draw.fBitmap = &fBitmap; // canvas should have already called accessBitmap
    draw.fMatrix = &SkMatrix::I();
    this->drawSprite(draw, *sprite, x, y, paint);
}

void GrDrawTarget::drawBatch(const GrPipelineBuilder& pipelineBuilder,
                             GrDrawContext* drawContext,
                             const GrClip& clip,
                             GrDrawBatch* batch) {
    // Setup clip
    GrAppliedClip appliedClip;
    SkRect bounds;
    batch_bounds(&bounds, batch);
    if (!clip.apply(fContext, drawContext, &bounds,
                    pipelineBuilder.isHWAntialias(), pipelineBuilder.hasUserStencilSettings(),
                    &appliedClip)) {
        return;
    }

    // TODO: this is the only remaining usage of the AutoRestoreFragmentProcessorState - remove it
    GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps;
    if (appliedClip.getClipCoverageFragmentProcessor()) {
        arfps.set(&pipelineBuilder);
        arfps.addCoverageFragmentProcessor(sk_ref_sp(appliedClip.getClipCoverageFragmentProcessor()));
    }

    GrPipeline::CreateArgs args;
    args.fPipelineBuilder = &pipelineBuilder;
    args.fDrawContext = drawContext;
    args.fCaps = this->caps();
    args.fScissor = &appliedClip.scissorState();
    args.fHasStencilClip = appliedClip.hasStencilClip();
    if (pipelineBuilder.hasUserStencilSettings() || appliedClip.hasStencilClip()) {
        if (!fResourceProvider->attachStencilAttachment(drawContext->accessRenderTarget())) {
            SkDebugf("ERROR creating stencil attachment. Draw skipped.\n");
            return;
        }
    }
    batch->getPipelineOptimizations(&args.fOpts);
    GrScissorState finalScissor;
    if (args.fOpts.fOverrides.fUsePLSDstRead || fClipBatchToBounds) {
        GrGLIRect viewport;
        viewport.fLeft = 0;
        viewport.fBottom = 0;
        viewport.fWidth = drawContext->width();
        viewport.fHeight = drawContext->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(
        sk_sp_address_as_pointer_address(pipelineBuilder.fColorFragmentProcessors.begin()),
        pipelineBuilder.numColorFragmentProcessors());
    args.fOpts.fCoveragePOI.completeCalculations(
        sk_sp_address_as_pointer_address(pipelineBuilder.fCoverageFragmentProcessors.begin()),
        pipelineBuilder.numCoverageFragmentProcessors());
    if (!this->setupDstReadIfNecessary(pipelineBuilder, drawContext->accessRenderTarget(),
                                       clip, args.fOpts,
                                       &args.fDstTexture, batch->bounds())) {
        return;
    }

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

#ifdef ENABLE_MDB
    SkASSERT(fRenderTarget);
    batch->pipeline()->addDependenciesTo(fRenderTarget);
#endif
    SkRect clippedBounds;
    SkAssertResult(intersect(&clippedBounds, bounds, appliedClip.deviceBounds()));
    this->recordBatch(batch, clippedBounds);
}

// Draws the given bitmap to the given canvas. The subset of the source bitmap
// identified by src_rect is drawn to the given destination rect. The bitmap
// will be resampled to resample_width * resample_height (this is the size of
// the whole image, not the subset). See shouldResampleBitmap for more.
//
// This does a lot of computation to resample only the portion of the bitmap
// that will only be drawn. This is critical for performance since when we are
// scrolling, for example, we are only drawing a small strip of the image.
// Resampling the whole image every time is very slow, so this speeds up things
// dramatically.
static void drawResampledBitmap(SkCanvas& canvas, SkPaint& paint, const NativeImageSkia& bitmap, const SkIRect& srcIRect, const SkRect& destRect)
{
    // First get the subset we need. This is efficient and does not copy pixels.
    SkBitmap subset;
    bitmap.extractSubset(&subset, srcIRect);
    SkRect srcRect;
    srcRect.set(srcIRect);

    // Whether we're doing a subset or using the full source image.
    bool srcIsFull = srcIRect.fLeft == 0 && srcIRect.fTop == 0
        && srcIRect.width() == bitmap.width()
        && srcIRect.height() == bitmap.height();

    // We will always draw in integer sizes, so round the destination rect.
    SkIRect destRectRounded;
    destRect.round(&destRectRounded);
    SkIRect resizedImageRect =  // Represents the size of the resized image.
        { 0, 0, destRectRounded.width(), destRectRounded.height() };

    if (srcIsFull && bitmap.hasResizedBitmap(destRectRounded.width(), destRectRounded.height())) {
        // Yay, this bitmap frame already has a resized version.
        SkBitmap resampled = bitmap.resizedBitmap(destRectRounded.width(), destRectRounded.height());
        canvas.drawBitmapRect(resampled, 0, destRect, &paint);
        return;
    }

    // Compute the visible portion of our rect.
    SkRect destBitmapSubsetSk;
    ClipRectToCanvas(canvas, destRect, &destBitmapSubsetSk);
    destBitmapSubsetSk.offset(-destRect.fLeft, -destRect.fTop);

    // The matrix inverting, etc. could have introduced rounding error which
    // causes the bounds to be outside of the resized bitmap. We round outward
    // so we always lean toward it being larger rather than smaller than we
    // need, and then clamp to the bitmap bounds so we don't get any invalid
    // data.
    SkIRect destBitmapSubsetSkI;
    destBitmapSubsetSk.roundOut(&destBitmapSubsetSkI);
    if (!destBitmapSubsetSkI.intersect(resizedImageRect))
        return;  // Resized image does not intersect.

    if (srcIsFull && bitmap.shouldCacheResampling(
            resizedImageRect.width(),
            resizedImageRect.height(),
            destBitmapSubsetSkI.width(),
            destBitmapSubsetSkI.height())) {
        // We're supposed to resize the entire image and cache it, even though
        // we don't need all of it.
        SkBitmap resampled = bitmap.resizedBitmap(destRectRounded.width(),
                                                  destRectRounded.height());
        canvas.drawBitmapRect(resampled, 0, destRect, &paint);
    } else {
        // We should only resize the exposed part of the bitmap to do the
        // minimal possible work.

        // Resample the needed part of the image.
        SkBitmap resampled = skia::ImageOperations::Resize(subset,
            skia::ImageOperations::RESIZE_LANCZOS3,
            destRectRounded.width(), destRectRounded.height(),
            destBitmapSubsetSkI);

        // Compute where the new bitmap should be drawn. Since our new bitmap
        // may be smaller than the original, we have to shift it over by the
        // same amount that we cut off the top and left.
        destBitmapSubsetSkI.offset(destRect.fLeft, destRect.fTop);
        SkRect offsetDestRect;
        offsetDestRect.set(destBitmapSubsetSkI);

        canvas.drawBitmapRect(resampled, 0, offsetDestRect, &paint);
    }
}