C++ GrCachedLayer::texture方法代码示例

// Add several layers to the cache
static void create_layers(skiatest::Reporter* reporter,
                          GrLayerCache* cache,
                          const SkPicture& picture,
                          int numToAdd,
                          int idOffset) {

    for (int i = 0; i < numToAdd; ++i) {
        GrCachedLayer* layer = cache->findLayerOrCreate(&picture,
                               idOffset+i+1, idOffset+i+2,
                               SkMatrix::I());
        REPORTER_ASSERT(reporter, NULL != layer);
        GrCachedLayer* temp = cache->findLayer(&picture, idOffset+i+1, idOffset+i+2, SkMatrix::I());
        REPORTER_ASSERT(reporter, temp == layer);

        REPORTER_ASSERT(reporter, TestingAccess::NumLayers(cache) == idOffset + i + 1);

        REPORTER_ASSERT(reporter, picture.uniqueID() == layer->pictureID());
        REPORTER_ASSERT(reporter, layer->start() == idOffset + i + 1);
        REPORTER_ASSERT(reporter, layer->stop() == idOffset + i + 2);
        REPORTER_ASSERT(reporter, layer->ctm() == SkMatrix::I());
        REPORTER_ASSERT(reporter, NULL == layer->texture());
        REPORTER_ASSERT(reporter, !layer->isAtlased());
    }

    cache->trackPicture(&picture);
}

// Add several layers to the cache
static void create_layers(skiatest::Reporter* reporter,
                          GrLayerCache* cache,
                          const SkPicture& picture,
                          unsigned numToAdd,
                          unsigned idOffset) {

    for (unsigned i = 0; i < numToAdd; ++i) {
        unsigned indices[1] = { idOffset+i+1 };
        GrCachedLayer* layer = cache->findLayerOrCreate(picture.uniqueID(), 
                                                        idOffset+i+1, idOffset+i+2, 
                                                        SkIRect::MakeEmpty(),
                                                        SkIRect::MakeEmpty(),
                                                        SkMatrix::I(),
                                                        indices, 1,
                                                        NULL);
        REPORTER_ASSERT(reporter, layer);
        GrCachedLayer* temp = TestingAccess::Find(cache, picture.uniqueID(), SkMatrix::I(), 
                                                  indices, 1);
        REPORTER_ASSERT(reporter, temp == layer);

        REPORTER_ASSERT(reporter, TestingAccess::NumLayers(cache) == idOffset + i + 1);

        REPORTER_ASSERT(reporter, picture.uniqueID() == layer->pictureID());
        REPORTER_ASSERT(reporter, layer->start() == idOffset + i + 1);
        REPORTER_ASSERT(reporter, layer->stop() == idOffset + i + 2);
        REPORTER_ASSERT(reporter, NULL == layer->texture());
        REPORTER_ASSERT(reporter, NULL == layer->paint());
        REPORTER_ASSERT(reporter, !layer->isAtlased());
    }
}

// Create the layer information for the hoisted layer and secure the
// required texture/render target resources.
static void prepare_for_hoisting(GrLayerCache* layerCache, 
                                 const SkPicture* topLevelPicture,
                                 const GrAccelData::SaveLayerInfo& info,
                                 const SkIRect& layerRect,
                                 SkTDArray<GrHoistedLayer>* atlased,
                                 SkTDArray<GrHoistedLayer>* nonAtlased,
                                 SkTDArray<GrHoistedLayer>* recycled) {
    const SkPicture* pict = info.fPicture ? info.fPicture : topLevelPicture;

    GrCachedLayer* layer = layerCache->findLayerOrCreate(pict->uniqueID(),
                                                         info.fSaveLayerOpID,
                                                         info.fRestoreOpID,
                                                         layerRect,
                                                         info.fOriginXform,
                                                         info.fPaint);

    GrTextureDesc desc;
    desc.fFlags = kRenderTarget_GrTextureFlagBit;
    desc.fWidth = layerRect.width();
    desc.fHeight = layerRect.height();
    desc.fConfig = kSkia8888_GrPixelConfig;
    // TODO: need to deal with sample count


    bool disallowAtlasing = info.fHasNestedLayers || info.fIsNested ||
                            (layer->paint() && layer->paint()->getImageFilter());

    bool needsRendering = layerCache->lock(layer, desc, disallowAtlasing);
    if (NULL == layer->texture()) {
        // GPU resources could not be secured for the hoisting of this layer
        return;
    }

    GrHoistedLayer* hl;

    if (needsRendering) {
        if (layer->isAtlased()) {
            hl = atlased->append();
        } else {
            hl = nonAtlased->append();
        }
    } else {
        hl = recycled->append();
    }
    
    layerCache->addUse(layer);
    hl->fLayer = layer;
    hl->fPicture = pict;
    hl->fOffset = SkIPoint::Make(layerRect.fLeft, layerRect.fTop);
    hl->fCTM = info.fOriginXform;
}

// This test case exercises the public API of the GrLayerCache class.
// In particular it checks its interaction with the resource cache (w.r.t.
// locking & unlocking textures).
// TODO: need to add checks on VRAM usage!
DEF_GPUTEST(GpuLayerCache, reporter, factory) {
    static const int kInitialNumLayers = 5;

    for (int i= 0; i < GrContextFactory::kGLContextTypeCnt; ++i) {
        GrContextFactory::GLContextType glCtxType = (GrContextFactory::GLContextType) i;

        if (!GrContextFactory::IsRenderingGLContext(glCtxType)) {
            continue;
        }

        GrContext* context = factory->get(glCtxType);

        if (NULL == context) {
            continue;
        }

        SkPictureRecorder recorder;
        recorder.beginRecording(1, 1);
        SkAutoTUnref<const SkPicture> picture(recorder.endRecording());

        GrLayerCache cache(context);

        create_layers(reporter, &cache, *picture, kInitialNumLayers, 0);

        for (int i = 0; i < kInitialNumLayers; ++i) {
            GrCachedLayer* layer = cache.findLayer(picture, i+1, i+2, SkMatrix::I());
            REPORTER_ASSERT(reporter, NULL != layer);

            lock_layer(reporter, &cache, layer);

            // The first 4 layers should be in the atlas (and thus have non-empty
            // rects)
            if (i < 4) {
                REPORTER_ASSERT(reporter, layer->isAtlased());
            } else {
                // The 5th layer couldn't fit in the atlas
                REPORTER_ASSERT(reporter, !layer->isAtlased());
            }
        }

        // Unlock the textures
        for (int i = 0; i < kInitialNumLayers; ++i) {
            GrCachedLayer* layer = cache.findLayer(picture, i+1, i+2, SkMatrix::I());
            REPORTER_ASSERT(reporter, NULL != layer);

            cache.unlock(layer);
        }

        for (int i = 0; i < kInitialNumLayers; ++i) {
            GrCachedLayer* layer = cache.findLayer(picture, i+1, i+2, SkMatrix::I());
            REPORTER_ASSERT(reporter, NULL != layer);

            REPORTER_ASSERT(reporter, !layer->locked());
            // The first 4 layers should still be in the atlas.
            if (i < 4) {
                REPORTER_ASSERT(reporter, NULL != layer->texture());
                REPORTER_ASSERT(reporter, layer->isAtlased());
            } else {
                // The final layer should be unlocked.
                REPORTER_ASSERT(reporter, NULL == layer->texture());
                REPORTER_ASSERT(reporter, !layer->isAtlased());
            }
        }

        {
            // Add an additional layer. Since all the layers are unlocked this
            // will force out the first atlased layer
            create_layers(reporter, &cache, *picture, 1, kInitialNumLayers);
            GrCachedLayer* layer = cache.findLayer(picture,
                                                   kInitialNumLayers+1, kInitialNumLayers+2,
                                                   SkMatrix::I());
            REPORTER_ASSERT(reporter, NULL != layer);

            lock_layer(reporter, &cache, layer);
            cache.unlock(layer);
        }

        for (int i = 0; i < kInitialNumLayers+1; ++i) {
            GrCachedLayer* layer = cache.findLayer(picture, i+1, i+2, SkMatrix::I());
            // 3 old layers plus the new one should be in the atlas.
            if (1 == i || 2 == i || 3 == i || 5 == i) {
                REPORTER_ASSERT(reporter, NULL != layer);
                REPORTER_ASSERT(reporter, !layer->locked());
                REPORTER_ASSERT(reporter, NULL != layer->texture());
                REPORTER_ASSERT(reporter, layer->isAtlased());
            } else if (4 == i) {
                // The one that was never atlased should still be around
                REPORTER_ASSERT(reporter, NULL != layer);

                REPORTER_ASSERT(reporter, NULL == layer->texture());
                REPORTER_ASSERT(reporter, !layer->isAtlased());
            } else {
                // The one bumped out of the atlas (i.e., 0) should be gone
                REPORTER_ASSERT(reporter, NULL == layer);
            }
        }
//.........这里部分代码省略.........

// This test case exercises the public API of the GrLayerCache class.
// In particular it checks its interaction with the resource cache (w.r.t.
// locking & unlocking textures).
// TODO: need to add checks on VRAM usage!
DEF_GPUTEST(GpuLayerCache, reporter, factory) {

    GrContext* context = factory->get(GrContextFactory::kNative_GLContextType);
    if (NULL == context) {
        return;
    }

    SkPicture picture;

    GrLayerCache cache(context);

    create_layers(reporter, &cache, picture);

    // Lock the layers making them all 512x512
    GrTextureDesc desc;
    desc.fWidth = 512;
    desc.fHeight = 512;
    desc.fConfig = kSkia8888_GrPixelConfig;

    for (int i = 0; i < kNumLayers; ++i) {
        GrCachedLayer* layer = cache.findLayer(&picture, i);
        REPORTER_ASSERT(reporter, NULL != layer);

        bool foundInCache = cache.lock(layer, desc);
        REPORTER_ASSERT(reporter, !foundInCache);
        foundInCache = cache.lock(layer, desc);
        REPORTER_ASSERT(reporter, foundInCache);

        REPORTER_ASSERT(reporter, NULL != layer->texture());
#if USE_ATLAS
        // The first 4 layers should be in the atlas (and thus have non-empty
        // rects)
        if (i < 4) {
            REPORTER_ASSERT(reporter, !layer->rect().isEmpty());
        } else {
#endif
            REPORTER_ASSERT(reporter, layer->rect().isEmpty());
#if USE_ATLAS
        }
#endif
    }

    // Unlock the textures
    for (int i = 0; i < kNumLayers; ++i) {
        GrCachedLayer* layer = cache.findLayer(&picture, i);
        REPORTER_ASSERT(reporter, NULL != layer);

        cache.unlock(layer);
    }

    for (int i = 0; i < kNumLayers; ++i) {
        GrCachedLayer* layer = cache.findLayer(&picture, i);
        REPORTER_ASSERT(reporter, NULL != layer);

#if USE_ATLAS
        // The first 4 layers should be in the atlas (and thus do not 
        // currently unlock). The final layer should be unlocked.
        if (i < 4) {
            REPORTER_ASSERT(reporter, NULL != layer->texture());
            REPORTER_ASSERT(reporter, !layer->rect().isEmpty());
        } else {
#endif
            REPORTER_ASSERT(reporter, NULL == layer->texture());
            REPORTER_ASSERT(reporter, layer->rect().isEmpty());
#if USE_ATLAS
        }
#endif
    }

    // Free them all SkGpuDevice-style. This will not free up the
    // atlas' texture but will eliminate all the layers.
    cache.purge(&picture);

    REPORTER_ASSERT(reporter, GetNumLayers::NumLayers(&cache) == 0);
    // TODO: add VRAM/resource cache check here
#if 0
    // Re-create the layers
    create_layers(reporter, &cache, picture);

    // Free them again GrContext-style. This should free up everything.
    cache.freeAll();

    REPORTER_ASSERT(reporter, GetNumLayers::NumLayers(&cache) == 0);
    // TODO: add VRAM/resource cache check here
#endif
}

// This test case exercises the public API of the GrLayerCache class.
// In particular it checks its interaction with the resource cache (w.r.t.
// locking & unlocking textures).
// TODO: need to add checks on VRAM usage!
DEF_GPUTEST(GpuLayerCache, reporter, factory) {
    static const unsigned kInitialNumLayers = 5;

    for (int i= 0; i < GrContextFactory::kGLContextTypeCnt; ++i) {
        GrContextFactory::GLContextType glCtxType = (GrContextFactory::GLContextType) i;

        if (!GrContextFactory::IsRenderingGLContext(glCtxType)) {
            continue;
        }

        GrContext* context = factory->get(glCtxType);

        if (NULL == context) {
            continue;
        }

        SkPictureRecorder recorder;
        SkCanvas* c = recorder.beginRecording(1, 1);
            // Draw something, anything, to prevent an empty-picture optimization,
            // which is a singleton and never purged.
            c->drawRect(SkRect::MakeWH(1,1), SkPaint());
        SkAutoTUnref<const SkPicture> picture(recorder.endRecording());

        GrLayerCache cache(context);

        create_layers(reporter, &cache, *picture, kInitialNumLayers, 0);

        for (unsigned i = 0; i < kInitialNumLayers; ++i) {
            unsigned indices[1] = { i + 1 };
            GrCachedLayer* layer = TestingAccess::Find(&cache, picture->uniqueID(), SkMatrix::I(),
                                                       indices, 1);
            REPORTER_ASSERT(reporter, layer);

            lock_layer(reporter, &cache, layer);

            // The first 4 layers should be in the atlas (and thus have non-empty
            // rects)
            if (i < 4) {
                REPORTER_ASSERT(reporter, layer->isAtlased());
            } else {
                // The 5th layer couldn't fit in the atlas
                REPORTER_ASSERT(reporter, !layer->isAtlased());
            }
        }

        // Unlock the textures
        for (unsigned i = 0; i < kInitialNumLayers; ++i) {
            unsigned indices[1] = { i+1 };

            GrCachedLayer* layer = TestingAccess::Find(&cache, picture->uniqueID(), SkMatrix::I(),
                                                       indices, 1);
            REPORTER_ASSERT(reporter, layer);
            cache.removeUse(layer);
        }

        for (unsigned i = 0; i < kInitialNumLayers; ++i) {
            unsigned indices[1] = { i+1 };

            GrCachedLayer* layer = TestingAccess::Find(&cache, picture->uniqueID(), SkMatrix::I(),
                                                       indices, 1);
            REPORTER_ASSERT(reporter, layer);

            // All the layers should be unlocked
            REPORTER_ASSERT(reporter, !layer->locked());

            // When hoisted layers aren't cached they are aggressively removed
            // from the atlas
#if GR_CACHE_HOISTED_LAYERS
            // The first 4 layers should still be in the atlas.
            if (i < 4) {
                REPORTER_ASSERT(reporter, layer->texture());
                REPORTER_ASSERT(reporter, layer->isAtlased());
            } else {
#endif
                // The final layer should not be atlased.
                REPORTER_ASSERT(reporter, NULL == layer->texture());
                REPORTER_ASSERT(reporter, !layer->isAtlased());
#if GR_CACHE_HOISTED_LAYERS
            }
#endif
        }

        {
            unsigned indices[1] = { kInitialNumLayers+1 };

            // Add an additional layer. Since all the layers are unlocked this 
            // will force out the first atlased layer
            create_layers(reporter, &cache, *picture, 1, kInitialNumLayers);
            GrCachedLayer* layer = TestingAccess::Find(&cache, picture->uniqueID(), SkMatrix::I(),
                                                       indices, 1);
            REPORTER_ASSERT(reporter, layer);

            lock_layer(reporter, &cache, layer);
            cache.removeUse(layer);
        }

//.........这里部分代码省略.........

void GrLayerHoister::DrawLayers(const SkTDArray<GrHoistedLayer>& atlased,
                                const SkTDArray<GrHoistedLayer>& nonAtlased,
                                const SkTDArray<GrHoistedLayer>& recycled,
                                GrReplacements* replacements) {
    // Render the atlased layers that require it
    if (atlased.count() > 0) {
        // All the atlased layers are rendered into the same GrTexture
        SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTargetDirect(
                                        atlased[0].fLayer->texture()->asRenderTarget(), NULL));

        SkCanvas* atlasCanvas = surface->getCanvas();

        SkPaint paint;
        paint.setColor(SK_ColorTRANSPARENT);
        paint.setXfermode(SkXfermode::Create(SkXfermode::kSrc_Mode))->unref();

        for (int i = 0; i < atlased.count(); ++i) {
            GrCachedLayer* layer = atlased[i].fLayer;
            const SkPicture* pict = atlased[i].fPicture;
            const SkIPoint offset = atlased[i].fOffset;

            atlasCanvas->save();

            // Add a rect clip to make sure the rendering doesn't
            // extend beyond the boundaries of the atlased sub-rect
            SkRect bound = SkRect::MakeXYWH(SkIntToScalar(layer->rect().fLeft),
                                            SkIntToScalar(layer->rect().fTop),
                                            SkIntToScalar(layer->rect().width()),
                                            SkIntToScalar(layer->rect().height()));
            atlasCanvas->clipRect(bound);

            // Since 'clear' doesn't respect the clip we need to draw a rect
            // TODO: ensure none of the atlased layers contain a clear call!
            atlasCanvas->drawRect(bound, paint);

            // info.fCTM maps the layer's top/left to the origin.
            // Since this layer is atlased, the top/left corner needs
            // to be offset to the correct location in the backing texture.
            SkMatrix initialCTM;
            initialCTM.setTranslate(SkIntToScalar(-offset.fX), 
                                    SkIntToScalar(-offset.fY));
            initialCTM.postTranslate(bound.fLeft, bound.fTop);
            
            atlasCanvas->translate(SkIntToScalar(-offset.fX), 
                                   SkIntToScalar(-offset.fY));
            atlasCanvas->translate(bound.fLeft, bound.fTop);
            atlasCanvas->concat(atlased[i].fCTM);

            SkRecordPartialDraw(*pict->fRecord.get(), atlasCanvas, bound,
                                layer->start()+1, layer->stop(), initialCTM);

            atlasCanvas->restore();
        }

        atlasCanvas->flush();
    }

    // Render the non-atlased layers that require it
    for (int i = 0; i < nonAtlased.count(); ++i) {
        GrCachedLayer* layer = nonAtlased[i].fLayer;
        const SkPicture* pict = nonAtlased[i].fPicture;
        const SkIPoint offset = nonAtlased[i].fOffset;

        // Each non-atlased layer has its own GrTexture
        SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTargetDirect(
                                        layer->texture()->asRenderTarget(), NULL));

        SkCanvas* layerCanvas = surface->getCanvas();

        // Add a rect clip to make sure the rendering doesn't
        // extend beyond the boundaries of the atlased sub-rect
        SkRect bound = SkRect::MakeXYWH(SkIntToScalar(layer->rect().fLeft),
                                        SkIntToScalar(layer->rect().fTop),
                                        SkIntToScalar(layer->rect().width()),
                                        SkIntToScalar(layer->rect().height()));

        layerCanvas->clipRect(bound); // TODO: still useful?

        layerCanvas->clear(SK_ColorTRANSPARENT);

        SkMatrix initialCTM;
        initialCTM.setTranslate(SkIntToScalar(-offset.fX), 
                                SkIntToScalar(-offset.fY));

        layerCanvas->translate(SkIntToScalar(-offset.fX), 
                               SkIntToScalar(-offset.fY));
        layerCanvas->concat(nonAtlased[i].fCTM);

        SkRecordPartialDraw(*pict->fRecord.get(), layerCanvas, bound,
                            layer->start()+1, layer->stop(), initialCTM);

        layerCanvas->flush();
    }

    convert_layers_to_replacements(atlased, replacements);
    convert_layers_to_replacements(nonAtlased, replacements);
    convert_layers_to_replacements(recycled, replacements);
}