tests/ResourceCacheTest.cpp

/*
 * Copyright 2013 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

// Include here to ensure SK_SUPPORT_GPU is set correctly before it is examined.
#include "SkTypes.h"

#if SK_SUPPORT_GPU

#include "GrContext.h"
#include "GrContextFactory.h"
#include "GrGpu.h"
#include "GrGpuResourceCacheAccess.h"
#include "GrGpuResourcePriv.h"
#include "GrRenderTarget.h"
#include "GrRenderTargetPriv.h"
#include "GrResourceCache.h"
#include "SkCanvas.h"
#include "SkGr.h"
#include "SkMessageBus.h"
#include "SkSurface.h"
#include "Test.h"

static const int gWidth = 640;
static const int gHeight = 480;

////////////////////////////////////////////////////////////////////////////////
static void test_cache(skiatest::Reporter* reporter, GrContext* context, SkCanvas* canvas) {
    const SkIRect size = SkIRect::MakeWH(gWidth, gHeight);

    SkBitmap src;
    src.allocN32Pixels(size.width(), size.height());
    src.eraseColor(SK_ColorBLACK);
    size_t srcSize = src.getSize();

    size_t initialCacheSize;
    context->getResourceCacheUsage(NULL, &initialCacheSize);

    int oldMaxNum;
    size_t oldMaxBytes;
    context->getResourceCacheLimits(&oldMaxNum, &oldMaxBytes);

    // Set the cache limits so we can fit 10 "src" images and the
    // max number of textures doesn't matter
    size_t maxCacheSize = initialCacheSize + 10*srcSize;
    context->setResourceCacheLimits(1000, maxCacheSize);

    SkBitmap readback;
    readback.allocN32Pixels(size.width(), size.height());

    for (int i = 0; i < 100; ++i) {
        canvas->drawBitmap(src, 0, 0);
        canvas->readPixels(size, &readback);

        // "modify" the src texture
        src.notifyPixelsChanged();

        size_t curCacheSize;
        context->getResourceCacheUsage(NULL, &curCacheSize);

        // we should never go over the size limit
        REPORTER_ASSERT(reporter, curCacheSize <= maxCacheSize);
    }

    context->setResourceCacheLimits(oldMaxNum, oldMaxBytes);
}

static void test_stencil_buffers(skiatest::Reporter* reporter, GrContext* context) {
    GrSurfaceDesc smallDesc;
    smallDesc.fFlags = kRenderTarget_GrSurfaceFlag;
    smallDesc.fConfig = kSkia8888_GrPixelConfig;
    smallDesc.fWidth = 4;
    smallDesc.fHeight = 4;
    smallDesc.fSampleCnt = 0;

    GrTextureProvider* cache = context->textureProvider();
    // Test that two budgeted RTs with the same desc share a stencil buffer.
    SkAutoTUnref<GrTexture> smallRT0(cache->createTexture(smallDesc, true));
    if (smallRT0 && smallRT0->asRenderTarget()) {
        smallRT0->asRenderTarget()->renderTargetPriv().attachStencilAttachment();
    }

    SkAutoTUnref<GrTexture> smallRT1(cache->createTexture(smallDesc, true));
    if (smallRT1 && smallRT1->asRenderTarget()) {
        smallRT1->asRenderTarget()->renderTargetPriv().attachStencilAttachment();
    }

    REPORTER_ASSERT(reporter,
                    smallRT0 && smallRT1 &&
                    smallRT0->asRenderTarget() && smallRT1->asRenderTarget() &&
                    smallRT0->asRenderTarget()->renderTargetPriv().getStencilAttachment() ==
                    smallRT1->asRenderTarget()->renderTargetPriv().getStencilAttachment());

    // An unbudgeted RT with the same desc should also share.
    SkAutoTUnref<GrTexture> smallRT2(cache->createTexture(smallDesc, false));
    if (smallRT2 && smallRT2->asRenderTarget()) {
        smallRT2->asRenderTarget()->renderTargetPriv().attachStencilAttachment();
    }
    REPORTER_ASSERT(reporter,
                    smallRT0 && smallRT2 &&
                    smallRT0->asRenderTarget() && smallRT2->asRenderTarget() &&
                    smallRT0->asRenderTarget()->renderTargetPriv().getStencilAttachment() ==
                    smallRT2->asRenderTarget()->renderTargetPriv().getStencilAttachment());

    // An RT with a much larger size should not share.
    GrSurfaceDesc bigDesc;
    bigDesc.fFlags = kRenderTarget_GrSurfaceFlag;
    bigDesc.fConfig = kSkia8888_GrPixelConfig;
    bigDesc.fWidth = 400;
    bigDesc.fHeight = 200;
    bigDesc.fSampleCnt = 0;
    SkAutoTUnref<GrTexture> bigRT(cache->createTexture(bigDesc, false));
    if (bigRT && bigRT->asRenderTarget()) {
        bigRT->asRenderTarget()->renderTargetPriv().attachStencilAttachment();
    }
    REPORTER_ASSERT(reporter,
                    smallRT0 && bigRT &&
                    smallRT0->asRenderTarget() && bigRT->asRenderTarget() &&
                    smallRT0->asRenderTarget()->renderTargetPriv().getStencilAttachment() !=
                    bigRT->asRenderTarget()->renderTargetPriv().getStencilAttachment());

    if (context->getMaxSampleCount() >= 4) {
        // An RT with a different sample count should not share. 
        GrSurfaceDesc smallMSAADesc = smallDesc;
        smallMSAADesc.fSampleCnt = 4;
        SkAutoTUnref<GrTexture> smallMSAART0(cache->createTexture(smallMSAADesc, false));
        if (smallMSAART0 && smallMSAART0->asRenderTarget()) {
            smallMSAART0->asRenderTarget()->renderTargetPriv().attachStencilAttachment();
        }
#ifdef SK_BUILD_FOR_ANDROID
        if (!smallMSAART0) {
            // The nexus player seems to fail to create MSAA textures.
            return;
        }
#endif
        REPORTER_ASSERT(reporter,
                        smallRT0 && smallMSAART0 &&
                        smallRT0->asRenderTarget() && smallMSAART0->asRenderTarget() &&
                        smallRT0->asRenderTarget()->renderTargetPriv().getStencilAttachment() !=
                        smallMSAART0->asRenderTarget()->renderTargetPriv().getStencilAttachment());
        // A second MSAA RT should share with the first MSAA RT.
        SkAutoTUnref<GrTexture> smallMSAART1(cache->createTexture(smallMSAADesc, false));
        if (smallMSAART1 && smallMSAART1->asRenderTarget()) {
            smallMSAART1->asRenderTarget()->renderTargetPriv().attachStencilAttachment();
        }
        REPORTER_ASSERT(reporter,
                        smallMSAART0 && smallMSAART1 &&
                        smallMSAART0->asRenderTarget() &&
                        smallMSAART1->asRenderTarget() &&
                        smallMSAART0->asRenderTarget()->renderTargetPriv().getStencilAttachment() ==
                        smallMSAART1->asRenderTarget()->renderTargetPriv().getStencilAttachment());
        // But not one with a larger sample count should not. (Also check that the request for 4
        // samples didn't get rounded up to >= 8 or else they could share.).
        if (context->getMaxSampleCount() >= 8 && smallMSAART0 && smallMSAART0->asRenderTarget() &&
            smallMSAART0->asRenderTarget()->numSamples() < 8) {
            smallMSAADesc.fSampleCnt = 8;
            smallMSAART1.reset(cache->createTexture(smallMSAADesc, false));
            SkAutoTUnref<GrTexture> smallMSAART1(cache->createTexture(smallMSAADesc, false));
            if (smallMSAART1 && smallMSAART1->asRenderTarget()) {
                smallMSAART1->asRenderTarget()->renderTargetPriv().attachStencilAttachment();
            }
            REPORTER_ASSERT(reporter,
                        smallMSAART0 && smallMSAART1 &&
                        smallMSAART0->asRenderTarget() &&
                        smallMSAART1->asRenderTarget() &&
                        smallMSAART0->asRenderTarget()->renderTargetPriv().getStencilAttachment() !=
                        smallMSAART1->asRenderTarget()->renderTargetPriv().getStencilAttachment());
        }
    }
}

class TestResource : public GrGpuResource {
    static const size_t kDefaultSize = 100;
    enum ScratchConstructor { kScratchConstructor };
public:
    SK_DECLARE_INST_COUNT(TestResource);
    /** Property that distinctly categorizes the resource.
     * For example, textures have width, height, ... */
    enum SimulatedProperty { kA_SimulatedProperty, kB_SimulatedProperty };

    TestResource(GrGpu* gpu, size_t size, GrGpuResource::LifeCycle lifeCycle)
        : INHERITED(gpu, lifeCycle)
        , fToDelete(NULL)
        , fSize(size)
        , fProperty(kA_SimulatedProperty) {
        ++fNumAlive;
        this->registerWithCache();
    }

    TestResource(GrGpu* gpu, GrGpuResource::LifeCycle lifeCycle)
        : INHERITED(gpu, lifeCycle)
        , fToDelete(NULL)
        , fSize(kDefaultSize)
        , fProperty(kA_SimulatedProperty) {
        ++fNumAlive;
        this->registerWithCache();
    }

    TestResource(GrGpu* gpu)
        : INHERITED(gpu, kCached_LifeCycle)
        , fToDelete(NULL)
        , fSize(kDefaultSize)
        , fProperty(kA_SimulatedProperty) {
        ++fNumAlive;
        this->registerWithCache();
    }

    static TestResource* CreateScratch(GrGpu* gpu, SimulatedProperty property, bool cached = true) {
        return SkNEW_ARGS(TestResource, (gpu, property, cached, kScratchConstructor));
    }

    ~TestResource() {
        --fNumAlive;
        SkSafeUnref(fToDelete);
    }

    void setSize(size_t size) {
        fSize = size;
        this->didChangeGpuMemorySize();
    }

    static int NumAlive() { return fNumAlive; }

    void setUnrefWhenDestroyed(TestResource* resource) {
        SkRefCnt_SafeAssign(fToDelete, resource);
    }

    static void ComputeScratchKey(SimulatedProperty property, GrScratchKey* key) {
        static GrScratchKey::ResourceType t = GrScratchKey::GenerateResourceType();
        GrScratchKey::Builder builder(key, t, kScratchKeyFieldCnt);
        for (int i = 0; i < kScratchKeyFieldCnt; ++i) {
            builder[i] = static_cast<uint32_t>(i + property);
        }
    }

    static size_t ExpectedScratchKeySize() {
        return sizeof(uint32_t) * (kScratchKeyFieldCnt + GrScratchKey::kMetaDataCnt);
    }

private:
    static const int kScratchKeyFieldCnt = 6;

    TestResource(GrGpu* gpu, SimulatedProperty property, bool cached, ScratchConstructor)
        : INHERITED(gpu, cached ? kCached_LifeCycle : kUncached_LifeCycle)
        , fToDelete(NULL)
        , fSize(kDefaultSize)
        , fProperty(property) {
        GrScratchKey scratchKey;
        ComputeScratchKey(fProperty, &scratchKey);
        this->setScratchKey(scratchKey);
        ++fNumAlive;
        this->registerWithCache();
    }

    size_t onGpuMemorySize() const override { return fSize; }

    TestResource* fToDelete;
    size_t fSize;
    static int fNumAlive;
    SimulatedProperty fProperty;
    typedef GrGpuResource INHERITED;
};
int TestResource::fNumAlive = 0;

class Mock {
public:
    Mock(int maxCnt, size_t maxBytes) {
        fContext.reset(GrContext::CreateMockContext());
        SkASSERT(fContext);
        fContext->setResourceCacheLimits(maxCnt, maxBytes);
        GrResourceCache* cache = fContext->getResourceCache();
        cache->purgeAllUnlocked();
        SkASSERT(0 == cache->getResourceCount() && 0 == cache->getResourceBytes());
    }

    GrResourceCache* cache() { return fContext->getResourceCache(); }

    GrContext* context() { return fContext; }

private:
    SkAutoTUnref<GrContext> fContext;
};

static void test_no_key(skiatest::Reporter* reporter) {
    Mock mock(10, 30000);
    GrContext* context = mock.context();
    GrResourceCache* cache = mock.cache();

    // Create a bunch of resources with no keys
    TestResource* a = SkNEW_ARGS(TestResource, (context->getGpu()));
    TestResource* b = SkNEW_ARGS(TestResource, (context->getGpu()));
    TestResource* c = SkNEW_ARGS(TestResource, (context->getGpu()));
    TestResource* d = SkNEW_ARGS(TestResource, (context->getGpu()));
    a->setSize(11);
    b->setSize(12);
    c->setSize(13);
    d->setSize(14);

    REPORTER_ASSERT(reporter, 4 == TestResource::NumAlive());
    REPORTER_ASSERT(reporter, 4 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, a->gpuMemorySize() + b->gpuMemorySize() + c->gpuMemorySize() +
                              d->gpuMemorySize() == cache->getResourceBytes());

    // Should be safe to purge without deleting the resources since we still have refs.
    cache->purgeAllUnlocked();
    REPORTER_ASSERT(reporter, 4 == TestResource::NumAlive());

    // Since the resources have neither unique nor scratch keys, delete immediately upon unref.

    a->unref();
    REPORTER_ASSERT(reporter, 3 == TestResource::NumAlive());
    REPORTER_ASSERT(reporter, 3 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, b->gpuMemorySize() + c->gpuMemorySize() + d->gpuMemorySize() ==
                              cache->getResourceBytes());

    c->unref();
    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());
    REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, b->gpuMemorySize() + d->gpuMemorySize() ==
                              cache->getResourceBytes());

    d->unref();
    REPORTER_ASSERT(reporter, 1 == TestResource::NumAlive());
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, b->gpuMemorySize() == cache->getResourceBytes());

    b->unref();
    REPORTER_ASSERT(reporter, 0 == TestResource::NumAlive());
    REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, 0 == cache->getResourceBytes());
}

// Each integer passed as a template param creates a new domain.
template <int> static void make_unique_key(GrUniqueKey* key, int data) {
    static GrUniqueKey::Domain d = GrUniqueKey::GenerateDomain();
    GrUniqueKey::Builder builder(key, d, 1);
    builder[0] = data;
}

static void test_budgeting(skiatest::Reporter* reporter) {
    Mock mock(10, 300);
    GrContext* context = mock.context();
    GrResourceCache* cache = mock.cache();

    GrUniqueKey uniqueKey;
    make_unique_key<0>(&uniqueKey, 0);

    // Create a scratch, a unique, and a wrapped resource
    TestResource* scratch =
            TestResource::CreateScratch(context->getGpu(), TestResource::kB_SimulatedProperty);
    scratch->setSize(10);
    TestResource* unique = SkNEW_ARGS(TestResource, (context->getGpu()));
    unique->setSize(11);
    unique->resourcePriv().setUniqueKey(uniqueKey);
    TestResource* wrapped = SkNEW_ARGS(TestResource,
                                       (context->getGpu(), GrGpuResource::kWrapped_LifeCycle));
    wrapped->setSize(12);
    TestResource* unbudgeted = SkNEW_ARGS(TestResource,
                                          (context->getGpu(), GrGpuResource::kUncached_LifeCycle));
    unbudgeted->setSize(13);

    // Make sure we can't add a unique key to the wrapped resource
    GrUniqueKey uniqueKey2;
    make_unique_key<0>(&uniqueKey2, 1);
    wrapped->resourcePriv().setUniqueKey(uniqueKey2);
    REPORTER_ASSERT(reporter, NULL == cache->findAndRefUniqueResource(uniqueKey2));

    // Make sure sizes are as we expect
    REPORTER_ASSERT(reporter, 4 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, scratch->gpuMemorySize() + unique->gpuMemorySize() +
                              wrapped->gpuMemorySize() + unbudgeted->gpuMemorySize() ==
                              cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 2 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, scratch->gpuMemorySize() + unique->gpuMemorySize() ==
                              cache->getBudgetedResourceBytes());

    // Our refs mean that the resources are non purgeable.
    cache->purgeAllUnlocked();
    REPORTER_ASSERT(reporter, 4 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, scratch->gpuMemorySize() + unique->gpuMemorySize() +
                              wrapped->gpuMemorySize() + unbudgeted->gpuMemorySize() ==
                              cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 2 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, scratch->gpuMemorySize() + unique->gpuMemorySize() ==
                              cache->getBudgetedResourceBytes());

    // Unreffing the wrapped resource should free it right away.
    wrapped->unref();
    REPORTER_ASSERT(reporter, 3 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, scratch->gpuMemorySize() + unique->gpuMemorySize() +
                              unbudgeted->gpuMemorySize() == cache->getResourceBytes());

    // Now try freeing the budgeted resources first
    wrapped = SkNEW_ARGS(TestResource, (context->getGpu(), GrGpuResource::kWrapped_LifeCycle));
    scratch->setSize(12);
    unique->unref();
    cache->purgeAllUnlocked();
    REPORTER_ASSERT(reporter, 3 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, scratch->gpuMemorySize() + wrapped->gpuMemorySize() +
                              unbudgeted->gpuMemorySize() == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 1 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, scratch->gpuMemorySize() == cache->getBudgetedResourceBytes());

    scratch->unref();
    cache->purgeAllUnlocked();
    REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, unbudgeted->gpuMemorySize() + wrapped->gpuMemorySize() ==
                              cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 0 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, 0 == cache->getBudgetedResourceBytes());

    wrapped->unref();
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, unbudgeted->gpuMemorySize() == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 0 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, 0 == cache->getBudgetedResourceBytes());

    unbudgeted->unref();
    REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, 0 == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 0 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, 0 == cache->getBudgetedResourceBytes());
}

static void test_unbudgeted(skiatest::Reporter* reporter) {
    Mock mock(10, 30000);
    GrContext* context = mock.context();
    GrResourceCache* cache = mock.cache();

    GrUniqueKey uniqueKey;
    make_unique_key<0>(&uniqueKey, 0);

    TestResource* scratch;
    TestResource* unique;
    TestResource* wrapped;
    TestResource* unbudgeted;

    // A large uncached or wrapped resource shouldn't evict anything.
    scratch = TestResource::CreateScratch(context->getGpu(), TestResource::kB_SimulatedProperty);
    scratch->setSize(10);
    scratch->unref();
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, 10 == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 1 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, 10 == cache->getBudgetedResourceBytes());

    unique = SkNEW_ARGS(TestResource, (context->getGpu()));
    unique->setSize(11);
    unique->resourcePriv().setUniqueKey(uniqueKey);
    unique->unref();
    REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, 21 == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 2 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, 21 == cache->getBudgetedResourceBytes());

    size_t large = 2 * cache->getResourceBytes();
    unbudgeted = SkNEW_ARGS(TestResource,
                            (context->getGpu(), large, GrGpuResource::kUncached_LifeCycle));
    REPORTER_ASSERT(reporter, 3 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, 21 + large == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 2 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, 21 == cache->getBudgetedResourceBytes());

    unbudgeted->unref();
    REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, 21 == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 2 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, 21 == cache->getBudgetedResourceBytes());

    wrapped = SkNEW_ARGS(TestResource,
                         (context->getGpu(), large, GrGpuResource::kWrapped_LifeCycle));
    REPORTER_ASSERT(reporter, 3 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, 21 + large == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 2 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, 21 == cache->getBudgetedResourceBytes());

    wrapped->unref();
    REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, 21 == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 2 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, 21 == cache->getBudgetedResourceBytes());

    cache->purgeAllUnlocked();
    REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, 0 == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 0 == cache->getBudgetedResourceCount());
    REPORTER_ASSERT(reporter, 0 == cache->getBudgetedResourceBytes());
}

// This method can't be static because it needs to friended in GrGpuResource::CacheAccess.
void test_unbudgeted_to_scratch(skiatest::Reporter* reporter);
/*static*/ void test_unbudgeted_to_scratch(skiatest::Reporter* reporter) {
    Mock mock(10, 300);
    GrContext* context = mock.context();
    GrResourceCache* cache = mock.cache();

    TestResource* resource =
        TestResource::CreateScratch(context->getGpu(), TestResource::kA_SimulatedProperty, false);
    GrScratchKey key;
    TestResource::ComputeScratchKey(TestResource::kA_SimulatedProperty, &key);

    size_t size = resource->gpuMemorySize();
    for (int i = 0; i < 2; ++i) {
        // Since this resource is unbudgeted, it should not be reachable as scratch.
        REPORTER_ASSERT(reporter, resource->resourcePriv().getScratchKey() == key);
        REPORTER_ASSERT(reporter, !resource->cacheAccess().isScratch());
        REPORTER_ASSERT(reporter, !resource->resourcePriv().isBudgeted());
        REPORTER_ASSERT(reporter, NULL == cache->findAndRefScratchResource(key));
        REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
        REPORTER_ASSERT(reporter, size == cache->getResourceBytes());
        REPORTER_ASSERT(reporter, 0 == cache->getBudgetedResourceCount());
        REPORTER_ASSERT(reporter, 0 == cache->getBudgetedResourceBytes());

        // Once it is unrefed, it should become available as scratch.
        resource->unref();
        REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
        REPORTER_ASSERT(reporter, size == cache->getResourceBytes());
        REPORTER_ASSERT(reporter, 1 == cache->getBudgetedResourceCount());
        REPORTER_ASSERT(reporter, size == cache->getBudgetedResourceBytes());
        resource = static_cast<TestResource*>(cache->findAndRefScratchResource(key));
        REPORTER_ASSERT(reporter, resource);
        REPORTER_ASSERT(reporter, resource->resourcePriv().getScratchKey() == key);
        REPORTER_ASSERT(reporter, resource->cacheAccess().isScratch());
        REPORTER_ASSERT(reporter, resource->resourcePriv().isBudgeted());

        if (0 == i) {
            // If made unbudgeted, it should return to original state: ref'ed and unbudgeted. Try 
            // the above tests again.
            resource->resourcePriv().makeUnbudgeted();
        } else {
            // After the second time around, try removing the scratch key
            resource->resourcePriv().removeScratchKey();
            REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
            REPORTER_ASSERT(reporter, size == cache->getResourceBytes());
            REPORTER_ASSERT(reporter, 1 == cache->getBudgetedResourceCount());
            REPORTER_ASSERT(reporter, size == cache->getBudgetedResourceBytes());
            REPORTER_ASSERT(reporter, !resource->resourcePriv().getScratchKey().isValid());
            REPORTER_ASSERT(reporter, !resource->cacheAccess().isScratch());
            REPORTER_ASSERT(reporter, resource->resourcePriv().isBudgeted());

            // now when it is unrefed it should die since it has no key.
            resource->unref();
            REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
            REPORTER_ASSERT(reporter, 0 == cache->getResourceBytes());
            REPORTER_ASSERT(reporter, 0 == cache->getBudgetedResourceCount());
            REPORTER_ASSERT(reporter, 0 == cache->getBudgetedResourceBytes());
        }
    }
}

static void test_duplicate_scratch_key(skiatest::Reporter* reporter) {
    Mock mock(5, 30000);
    GrContext* context = mock.context();
    GrResourceCache* cache = mock.cache();

    // Create two resources that have the same scratch key.
    TestResource* a = TestResource::CreateScratch(context->getGpu(),
                                                  TestResource::kB_SimulatedProperty);
    TestResource* b = TestResource::CreateScratch(context->getGpu(),
                                                  TestResource::kB_SimulatedProperty);
    a->setSize(11);
    b->setSize(12);
    GrScratchKey scratchKey1;
    TestResource::ComputeScratchKey(TestResource::kA_SimulatedProperty, &scratchKey1);
    // Check for negative case consistency. (leaks upon test failure.)
    REPORTER_ASSERT(reporter, NULL == cache->findAndRefScratchResource(scratchKey1));

    GrScratchKey scratchKey;
    TestResource::ComputeScratchKey(TestResource::kB_SimulatedProperty, &scratchKey);

    // Scratch resources are registered with GrResourceCache just by existing. There are 2.
    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());
    SkDEBUGCODE(REPORTER_ASSERT(reporter, 2 == cache->countScratchEntriesForKey(scratchKey));)
    REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, a->gpuMemorySize() + b->gpuMemorySize() ==
                              cache->getResourceBytes());

    // Our refs mean that the resources are non purgeable.
    cache->purgeAllUnlocked();
    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());
    REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());

    // Unref but don't purge
    a->unref();
    b->unref();
    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());
    SkDEBUGCODE(REPORTER_ASSERT(reporter, 2 == cache->countScratchEntriesForKey(scratchKey));)

    // Purge again. This time resources should be purgeable.
    cache->purgeAllUnlocked();
    REPORTER_ASSERT(reporter, 0 == TestResource::NumAlive());
    REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
    SkDEBUGCODE(REPORTER_ASSERT(reporter, 0 == cache->countScratchEntriesForKey(scratchKey));)
}

static void test_remove_scratch_key(skiatest::Reporter* reporter) {
    Mock mock(5, 30000);
    GrContext* context = mock.context();
    GrResourceCache* cache = mock.cache();

    // Create two resources that have the same scratch key.
    TestResource* a = TestResource::CreateScratch(context->getGpu(),
                                                  TestResource::kB_SimulatedProperty);
    TestResource* b = TestResource::CreateScratch(context->getGpu(),
                                                  TestResource::kB_SimulatedProperty);
    a->unref();
    b->unref();

    GrScratchKey scratchKey;
    // Ensure that scratch key lookup is correct for negative case.
    TestResource::ComputeScratchKey(TestResource::kA_SimulatedProperty, &scratchKey);
    // (following leaks upon test failure).
    REPORTER_ASSERT(reporter, cache->findAndRefScratchResource(scratchKey) == NULL);

    // Scratch resources are registered with GrResourceCache just by existing. There are 2.
    TestResource::ComputeScratchKey(TestResource::kB_SimulatedProperty, &scratchKey);
    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());
    SkDEBUGCODE(REPORTER_ASSERT(reporter, 2 == cache->countScratchEntriesForKey(scratchKey));)
    REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());

    // Find the first resource and remove its scratch key
    GrGpuResource* find;
    find = cache->findAndRefScratchResource(scratchKey);
    find->resourcePriv().removeScratchKey();
    // It's still alive, but not cached by scratch key anymore
    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());
    SkDEBUGCODE(REPORTER_ASSERT(reporter, 1 == cache->countScratchEntriesForKey(scratchKey));)
    REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());

    // The cache should immediately delete it when it's unrefed since it isn't accessible.
    find->unref();
    REPORTER_ASSERT(reporter, 1 == TestResource::NumAlive());
    SkDEBUGCODE(REPORTER_ASSERT(reporter, 1 == cache->countScratchEntriesForKey(scratchKey));)
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());

    // Repeat for the second resource.
    find = cache->findAndRefScratchResource(scratchKey);
    find->resourcePriv().removeScratchKey();
    REPORTER_ASSERT(reporter, 1 == TestResource::NumAlive());
    SkDEBUGCODE(REPORTER_ASSERT(reporter, 0 == cache->countScratchEntriesForKey(scratchKey));)
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());

    // Should be able to call this multiple times with no problem.
    find->resourcePriv().removeScratchKey();
    REPORTER_ASSERT(reporter, 1 == TestResource::NumAlive());
    SkDEBUGCODE(REPORTER_ASSERT(reporter, 0 == cache->countScratchEntriesForKey(scratchKey));)
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());

    find->unref();
    REPORTER_ASSERT(reporter, 0 == TestResource::NumAlive());
    SkDEBUGCODE(REPORTER_ASSERT(reporter, 0 == cache->countScratchEntriesForKey(scratchKey));)
    REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
}

static void test_scratch_key_consistency(skiatest::Reporter* reporter) {
    Mock mock(5, 30000);
    GrContext* context = mock.context();
    GrResourceCache* cache = mock.cache();

    // Create two resources that have the same scratch key.
    TestResource* a = TestResource::CreateScratch(context->getGpu(),
                                                  TestResource::kB_SimulatedProperty);
    TestResource* b = TestResource::CreateScratch(context->getGpu(),
                                                  TestResource::kB_SimulatedProperty);
    a->unref();
    b->unref();

    GrScratchKey scratchKey;
    // Ensure that scratch key comparison and assignment is consistent.
    GrScratchKey scratchKey1;
    TestResource::ComputeScratchKey(TestResource::kA_SimulatedProperty, &scratchKey1);
    GrScratchKey scratchKey2;
    TestResource::ComputeScratchKey(TestResource::kB_SimulatedProperty, &scratchKey2);
    REPORTER_ASSERT(reporter, scratchKey1.size() == TestResource::ExpectedScratchKeySize());
    REPORTER_ASSERT(reporter, scratchKey1 != scratchKey2);
    REPORTER_ASSERT(reporter, scratchKey2 != scratchKey1);
    scratchKey = scratchKey1;
    REPORTER_ASSERT(reporter, scratchKey.size() == TestResource::ExpectedScratchKeySize());
    REPORTER_ASSERT(reporter, scratchKey1 == scratchKey);
    REPORTER_ASSERT(reporter, scratchKey == scratchKey1);
    REPORTER_ASSERT(reporter, scratchKey2 != scratchKey);
    REPORTER_ASSERT(reporter, scratchKey != scratchKey2);
    scratchKey = scratchKey2;
    REPORTER_ASSERT(reporter, scratchKey.size() == TestResource::ExpectedScratchKeySize());
    REPORTER_ASSERT(reporter, scratchKey1 != scratchKey);
    REPORTER_ASSERT(reporter, scratchKey != scratchKey1);
    REPORTER_ASSERT(reporter, scratchKey2 == scratchKey);
    REPORTER_ASSERT(reporter, scratchKey == scratchKey2);

    // Ensure that scratch key lookup is correct for negative case.
    TestResource::ComputeScratchKey(TestResource::kA_SimulatedProperty, &scratchKey);
    // (following leaks upon test failure).
    REPORTER_ASSERT(reporter, cache->findAndRefScratchResource(scratchKey) == NULL);

    // Find the first resource with a scratch key and a copy of a scratch key.
    TestResource::ComputeScratchKey(TestResource::kB_SimulatedProperty, &scratchKey);
    GrGpuResource* find = cache->findAndRefScratchResource(scratchKey);
    REPORTER_ASSERT(reporter, find != NULL);
    find->unref();

    scratchKey2 = scratchKey;
    find = cache->findAndRefScratchResource(scratchKey2);
    REPORTER_ASSERT(reporter, find != NULL);
    REPORTER_ASSERT(reporter, find == a || find == b);

    GrGpuResource* find2 = cache->findAndRefScratchResource(scratchKey2);
    REPORTER_ASSERT(reporter, find2 != NULL);
    REPORTER_ASSERT(reporter, find2 == a || find2 == b);
    REPORTER_ASSERT(reporter, find2 != find);
    find2->unref();
    find->unref();
}

static void test_duplicate_unique_key(skiatest::Reporter* reporter) {
    Mock mock(5, 30000);
    GrContext* context = mock.context();
    GrResourceCache* cache = mock.cache();

    GrUniqueKey key;
    make_unique_key<0>(&key, 0);
    
    // Create two resources that we will attempt to register with the same unique key.
    TestResource* a = SkNEW_ARGS(TestResource, (context->getGpu()));
    a->setSize(11);
    
    // Set key on resource a.
    a->resourcePriv().setUniqueKey(key);
    REPORTER_ASSERT(reporter, a == cache->findAndRefUniqueResource(key));
    a->unref();

    // Make sure that redundantly setting a's key works.
    a->resourcePriv().setUniqueKey(key);
    REPORTER_ASSERT(reporter, a == cache->findAndRefUniqueResource(key));
    a->unref();
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, a->gpuMemorySize() == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 1 == TestResource::NumAlive());

    // Create resource b and set the same key. It should replace a's unique key cache entry.
    TestResource* b = SkNEW_ARGS(TestResource, (context->getGpu()));
    b->setSize(12);
    b->resourcePriv().setUniqueKey(key);
    REPORTER_ASSERT(reporter, b == cache->findAndRefUniqueResource(key));
    b->unref();

    // Still have two resources because a is still reffed.
    REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, a->gpuMemorySize() + b->gpuMemorySize() == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());

    a->unref();
    // Now a should be gone.
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, b->gpuMemorySize() == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 1 == TestResource::NumAlive());

    // Now replace b with c, but make sure c can start with one unique key and change it to b's key.
    // Also make b be unreffed when replacement occurs.
    b->unref();
    TestResource* c = SkNEW_ARGS(TestResource, (context->getGpu()));
    GrUniqueKey differentKey;
    make_unique_key<0>(&differentKey, 1);
    c->setSize(13);
    c->resourcePriv().setUniqueKey(differentKey);
    REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, b->gpuMemorySize() + c->gpuMemorySize() == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());
    // c replaces b and b should be immediately purged.
    c->resourcePriv().setUniqueKey(key);
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, c->gpuMemorySize() == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 1 == TestResource::NumAlive());

    // c shouldn't be purged because it is ref'ed.
    cache->purgeAllUnlocked();
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, c->gpuMemorySize() == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 1 == TestResource::NumAlive());

    // Drop the ref on c, it should be kept alive because it has a unique key.
    c->unref();
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, c->gpuMemorySize() == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 1 == TestResource::NumAlive());

    // Verify that we can find c, then remove its unique key. It should get purged immediately.
    REPORTER_ASSERT(reporter, c == cache->findAndRefUniqueResource(key));
    c->resourcePriv().removeUniqueKey();
    c->unref();
    REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, 0 == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, 0 == TestResource::NumAlive());
}

static void test_purge_invalidated(skiatest::Reporter* reporter) {
    Mock mock(5, 30000);
    GrContext* context = mock.context();
    GrResourceCache* cache = mock.cache();

    GrUniqueKey key1, key2, key3;
    make_unique_key<0>(&key1, 1);
    make_unique_key<0>(&key2, 2);
    make_unique_key<0>(&key3, 3);
    
    // Add three resources to the cache. Only c is usable as scratch.
    TestResource* a = SkNEW_ARGS(TestResource, (context->getGpu()));
    TestResource* b = SkNEW_ARGS(TestResource, (context->getGpu()));
    TestResource* c = TestResource::CreateScratch(context->getGpu(),
                                                  TestResource::kA_SimulatedProperty);
    a->resourcePriv().setUniqueKey(key1);
    b->resourcePriv().setUniqueKey(key2);
    c->resourcePriv().setUniqueKey(key3);
    a->unref();
    // hold b until *after* the message is sent.
    c->unref();

    REPORTER_ASSERT(reporter, cache->hasUniqueKey(key1));
    REPORTER_ASSERT(reporter, cache->hasUniqueKey(key2));
    REPORTER_ASSERT(reporter, cache->hasUniqueKey(key3));
    REPORTER_ASSERT(reporter, 3 == TestResource::NumAlive());

    typedef GrUniqueKeyInvalidatedMessage Msg;
    typedef SkMessageBus<GrUniqueKeyInvalidatedMessage> Bus;

    // Invalidate two of the three, they should be purged and no longer accessible via their keys.
    Bus::Post(Msg(key1));
    Bus::Post(Msg(key2));
    cache->purgeAsNeeded();
    // a should be deleted now, but we still have a ref on b.
    REPORTER_ASSERT(reporter, !cache->hasUniqueKey(key1));
    REPORTER_ASSERT(reporter, !cache->hasUniqueKey(key2));
    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());
    REPORTER_ASSERT(reporter, cache->hasUniqueKey(key3));

    // Invalidate the third.
    Bus::Post(Msg(key3));
    cache->purgeAsNeeded();
    // we still have a ref on b, c should be recycled as scratch.
    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());
    REPORTER_ASSERT(reporter, !cache->hasUniqueKey(key3));

    // make b purgeable. It should be immediately deleted since it has no key.
    b->unref();
    REPORTER_ASSERT(reporter, 1 == TestResource::NumAlive());

    // Make sure we actually get to c via it's scratch key, before we say goodbye.
    GrScratchKey scratchKey;
    TestResource::ComputeScratchKey(TestResource::kA_SimulatedProperty, &scratchKey);
    GrGpuResource* scratch = cache->findAndRefScratchResource(scratchKey);
    REPORTER_ASSERT(reporter, scratch == c);
    SkSafeUnref(scratch);

    // Get rid of c.
    cache->purgeAllUnlocked();
    scratch = cache->findAndRefScratchResource(scratchKey);
    REPORTER_ASSERT(reporter, 0 == TestResource::NumAlive());
    REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
    REPORTER_ASSERT(reporter, 0 == cache->getResourceBytes());
    REPORTER_ASSERT(reporter, !scratch);
    SkSafeUnref(scratch);
}

static void test_cache_chained_purge(skiatest::Reporter* reporter) {
    Mock mock(3, 30000);
    GrContext* context = mock.context();
    GrResourceCache* cache = mock.cache();

    GrUniqueKey key1, key2;
    make_unique_key<0>(&key1, 1);
    make_unique_key<0>(&key2, 2);


    TestResource* a = SkNEW_ARGS(TestResource, (context->getGpu()));
    TestResource* b = SkNEW_ARGS(TestResource, (context->getGpu()));
    a->resourcePriv().setUniqueKey(key1);
    b->resourcePriv().setUniqueKey(key2);

    // Make a cycle
    a->setUnrefWhenDestroyed(b);
    b->setUnrefWhenDestroyed(a);

    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());

    a->unref();
    b->unref();

    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());

    cache->purgeAllUnlocked();
    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());

    // Break the cycle
    a->setUnrefWhenDestroyed(NULL);
    REPORTER_ASSERT(reporter, 2 == TestResource::NumAlive());

    cache->purgeAllUnlocked();
    REPORTER_ASSERT(reporter, 0 == TestResource::NumAlive());
}

static void test_resource_size_changed(skiatest::Reporter* reporter) {
    GrUniqueKey key1, key2;
    make_unique_key<0>(&key1, 1);
    make_unique_key<0>(&key2, 2);

    // Test changing resources sizes (both increase & decrease).
    {
        Mock mock(3, 30000);
        GrContext* context = mock.context();
        GrResourceCache* cache = mock.cache();

        TestResource* a = SkNEW_ARGS(TestResource, (context->getGpu()));
        a->resourcePriv().setUniqueKey(key1);
        a->unref();

        TestResource* b = SkNEW_ARGS(TestResource, (context->getGpu()));
        b->resourcePriv().setUniqueKey(key2);
        b->unref();

        REPORTER_ASSERT(reporter, 200 == cache->getResourceBytes());
        REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());
        {
            SkAutoTUnref<TestResource> find2(
                static_cast<TestResource*>(cache->findAndRefUniqueResource(key2)));
            find2->setSize(200);
            SkAutoTUnref<TestResource> find1(
                static_cast<TestResource*>(cache->findAndRefUniqueResource(key1)));
            find1->setSize(50);
        }

        REPORTER_ASSERT(reporter, 250 == cache->getResourceBytes());
        REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());
    }

    // Test increasing a resources size beyond the cache budget.
    {
        Mock mock(2, 300);
        GrContext* context = mock.context();
        GrResourceCache* cache = mock.cache();

        TestResource* a = SkNEW_ARGS(TestResource, (context->getGpu()));
        a->setSize(100);
        a->resourcePriv().setUniqueKey(key1);
        a->unref();

        TestResource* b = SkNEW_ARGS(TestResource, (context->getGpu()));
        b->setSize(100);
        b->resourcePriv().setUniqueKey(key2);
        b->unref();

        REPORTER_ASSERT(reporter, 200 == cache->getResourceBytes());
        REPORTER_ASSERT(reporter, 2 == cache->getResourceCount());

        {
            SkAutoTUnref<TestResource> find2(static_cast<TestResource*>(
                cache->findAndRefUniqueResource(key2)));
            find2->setSize(201);
        }
        REPORTER_ASSERT(reporter, !cache->hasUniqueKey(key1));

        REPORTER_ASSERT(reporter, 201 == cache->getResourceBytes());
        REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
    }
}

static void test_timestamp_wrap(skiatest::Reporter* reporter) {
    static const int kCount = 50;
    static const int kBudgetCnt = kCount / 2;
    static const int kLockedFreq = 8;
    static const int kBudgetSize = 0x80000000;

    SkRandom random;

    // Run the test 2*kCount times;
    for (int i = 0; i < 2 * kCount; ++i ) {
        Mock mock(kBudgetCnt, kBudgetSize);
        GrContext* context = mock.context();
        GrResourceCache* cache = mock.cache();

        // Pick a random number of resources to add before the timestamp will wrap.
        cache->changeTimestamp(SK_MaxU32 - random.nextULessThan(kCount + 1));

        static const int kNumToPurge = kCount - kBudgetCnt;

        SkTDArray<int> shouldPurgeIdxs;
        int purgeableCnt = 0;
        SkTDArray<GrGpuResource*> resourcesToUnref;

        // Add kCount resources, holding onto resources at random so we have a mix of purgeable and
        // unpurgeable resources.
        for (int j = 0; j < kCount; ++j) {
            GrUniqueKey key;
            make_unique_key<0>(&key, j);

            TestResource* r = SkNEW_ARGS(TestResource, (context->getGpu()));
            r->resourcePriv().setUniqueKey(key);
            if (random.nextU() % kLockedFreq) {
                // Make this is purgeable.
                r->unref();
                ++purgeableCnt;
                if (purgeableCnt <= kNumToPurge) {
                    *shouldPurgeIdxs.append() = j;
                }
            } else {
                *resourcesToUnref.append() = r;
            }
        }

        // Verify that the correct resources were purged.
        int currShouldPurgeIdx = 0;
        for (int j = 0; j < kCount; ++j) {
            GrUniqueKey key;
            make_unique_key<0>(&key, j);
            GrGpuResource* res = cache->findAndRefUniqueResource(key);
            if (currShouldPurgeIdx < shouldPurgeIdxs.count() &&
                shouldPurgeIdxs[currShouldPurgeIdx] == j) {
                ++currShouldPurgeIdx;
                REPORTER_ASSERT(reporter, NULL == res);
            } else {
                REPORTER_ASSERT(reporter, NULL != res);
            }
            SkSafeUnref(res);
        }

        for (int j = 0; j < resourcesToUnref.count(); ++j) {
            resourcesToUnref[j]->unref();
        }
    }
}

static void test_flush(skiatest::Reporter* reporter) {
    Mock mock(1000000, 1000000);
    GrContext* context = mock.context();
    GrResourceCache* cache = mock.cache();

    // The current cache impl will round the max flush count to the next power of 2. So we choose a
    // power of two here to keep things simpler.
    static const int kFlushCount = 16;
    cache->setLimits(1000000, 1000000, kFlushCount);

    {
        // Insert a resource and send a flush notification kFlushCount times.
        for (int i = 0; i < kFlushCount; ++i) {
            TestResource* r = SkNEW_ARGS(TestResource, (context->getGpu()));
            GrUniqueKey k;
            make_unique_key<1>(&k, i);
            r->resourcePriv().setUniqueKey(k);
            r->unref();
            cache->notifyFlushOccurred();
        }

        // Send flush notifications to the cache. Each flush should purge the oldest resource.
        for (int i = 0; i < kFlushCount - 1; ++i) {
            // The first resource was purged after the last flush in the initial loop, hence the -1.
            REPORTER_ASSERT(reporter, kFlushCount - i - 1 == cache->getResourceCount());
            for (int j = 0; j < i; ++j) {
                GrUniqueKey k;
                make_unique_key<1>(&k, j);
                GrGpuResource* r = cache->findAndRefUniqueResource(k);
                REPORTER_ASSERT(reporter, !SkToBool(r));
                SkSafeUnref(r);
            }
            cache->notifyFlushOccurred();
        }

        REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
        cache->purgeAllUnlocked();
    }

    // Do a similar test but where we leave refs on some resources to prevent them from being
    // purged.
    {
        GrGpuResource* refedResources[kFlushCount >> 1];
        for (int i = 0; i < kFlushCount; ++i) {
            TestResource* r = SkNEW_ARGS(TestResource, (context->getGpu()));
            GrUniqueKey k;
            make_unique_key<1>(&k, i);
            r->resourcePriv().setUniqueKey(k);
            // Leave a ref on every other resource, beginning with the first.
            if (SkToBool(i & 0x1)) {
                refedResources[i/2] = r;
            } else {
                r->unref();
            }
            cache->notifyFlushOccurred();
        }

        for (int i = 0; i < kFlushCount; ++i) {
            // Should get a resource purged every other flush.
            REPORTER_ASSERT(reporter, kFlushCount - i/2 - 1 == cache->getResourceCount());
            cache->notifyFlushOccurred();
        }

        // Unref all the resources that we kept refs on in the first loop.
        for (int i = 0; i < kFlushCount >> 1; ++i) {
            refedResources[i]->unref();
        }

        // When we unref'ed them their timestamps got updated. So nothing should be purged until we
        // get kFlushCount additional flushes. Then everything should be purged.
        for (int i = 0; i < kFlushCount; ++i) {
            REPORTER_ASSERT(reporter, kFlushCount >> 1 == cache->getResourceCount());
            cache->notifyFlushOccurred();
        }
        REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());

        cache->purgeAllUnlocked();
    }

    REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
}

static void test_large_resource_count(skiatest::Reporter* reporter) {
    // Set the cache size to double the resource count because we're going to create 2x that number
    // resources, using two different key domains. Add a little slop to the bytes because we resize
    // down to 1 byte after creating the resource.
    static const int kResourceCnt = 2000;

    Mock mock(2 * kResourceCnt, 2 * kResourceCnt + 1000);
    GrContext* context = mock.context();
    GrResourceCache* cache = mock.cache();

    for (int i = 0; i < kResourceCnt; ++i) {
        GrUniqueKey key1, key2;
        make_unique_key<1>(&key1, i);
        make_unique_key<2>(&key2, i);

        TestResource* resource;

        resource = SkNEW_ARGS(TestResource, (context->getGpu()));
        resource->resourcePriv().setUniqueKey(key1);
        resource->setSize(1);
        resource->unref();

        resource = SkNEW_ARGS(TestResource, (context->getGpu()));
        resource->resourcePriv().setUniqueKey(key2);
        resource->setSize(1);
        resource->unref();
    }

    REPORTER_ASSERT(reporter, TestResource::NumAlive() == 2 * kResourceCnt);
    REPORTER_ASSERT(reporter, cache->getBudgetedResourceBytes() == 2 * kResourceCnt);
    REPORTER_ASSERT(reporter, cache->getBudgetedResourceCount() == 2 * kResourceCnt);
    REPORTER_ASSERT(reporter, cache->getResourceBytes() == 2 * kResourceCnt);
    REPORTER_ASSERT(reporter, cache->getResourceCount() == 2 * kResourceCnt);
    for (int i = 0; i < kResourceCnt; ++i) {
        GrUniqueKey key1, key2;
        make_unique_key<1>(&key1, i);
        make_unique_key<2>(&key2, i);

        REPORTER_ASSERT(reporter, cache->hasUniqueKey(key1));
        REPORTER_ASSERT(reporter, cache->hasUniqueKey(key2));
    }

    cache->purgeAllUnlocked();
    REPORTER_ASSERT(reporter, TestResource::NumAlive() == 0);
    REPORTER_ASSERT(reporter, cache->getBudgetedResourceBytes() == 0);
    REPORTER_ASSERT(reporter, cache->getBudgetedResourceCount() == 0);
    REPORTER_ASSERT(reporter, cache->getResourceBytes() == 0);
    REPORTER_ASSERT(reporter, cache->getResourceCount() == 0);

    for (int i = 0; i < kResourceCnt; ++i) {
        GrUniqueKey key1, key2;
        make_unique_key<1>(&key1, i);
        make_unique_key<2>(&key2, i);

        REPORTER_ASSERT(reporter, !cache->hasUniqueKey(key1));
        REPORTER_ASSERT(reporter, !cache->hasUniqueKey(key2));
    }
}

////////////////////////////////////////////////////////////////////////////////
DEF_GPUTEST(ResourceCache, reporter, factory) {
    for (int type = 0; type < GrContextFactory::kLastGLContextType; ++type) {
        GrContextFactory::GLContextType glType = static_cast<GrContextFactory::GLContextType>(type);
        if (!GrContextFactory::IsRenderingGLContext(glType)) {
            continue;
        }
        GrContext* context = factory->get(glType);
        if (NULL == context) {
            continue;
        }
        GrSurfaceDesc desc;
        desc.fConfig = kSkia8888_GrPixelConfig;
        desc.fFlags = kRenderTarget_GrSurfaceFlag;
        desc.fWidth = gWidth;
        desc.fHeight = gHeight;
        SkImageInfo info = SkImageInfo::MakeN32Premul(gWidth, gHeight);
        SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTarget(context,
                                                                   SkSurface::kNo_Budgeted, info));
        test_cache(reporter, context, surface->getCanvas());
        test_stencil_buffers(reporter, context);
    }

    // The below tests create their own mock contexts.
    test_no_key(reporter);
    test_budgeting(reporter);
    test_unbudgeted(reporter);
    test_unbudgeted_to_scratch(reporter);
    test_duplicate_unique_key(reporter);
    test_duplicate_scratch_key(reporter);
    test_remove_scratch_key(reporter);
    test_scratch_key_consistency(reporter);
    test_purge_invalidated(reporter);
    test_cache_chained_purge(reporter);
    test_resource_size_changed(reporter);
    test_timestamp_wrap(reporter);
    test_flush(reporter);
    test_large_resource_count(reporter);
}

#endif