tests/GpuLayerCacheTest.cpp - skia - Git at Google

 /*
 * Copyright 2014 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

 // Disabling this test since it is for the layer hoister which is current disabled.
 // The test fails when we add a discard to a newly created render target.
 #if 0

 #if SK_SUPPORT_GPU

 #include "GrContext.h"
 #include "GrLayerCache.h"
 #include "GrResourceCache.h"
 #include "SkPictureRecorder.h"
 #include "Test.h"

 class TestingAccess {
 public:
     static int NumPlots() {
         return GrLayerCache::kNumPlotsX * GrLayerCache::kNumPlotsY;
     }
     static SkISize PlotSize() {
         return SkISize::Make(GrLayerCache::kAtlasTextureWidth / GrLayerCache::kNumPlotsX,
                              GrLayerCache::kAtlasTextureHeight / GrLayerCache::kNumPlotsY);
     }

     static GrTexture* GetBackingTexture(GrLayerCache* cache) {
         return cache->fAtlas->getTextureOrNull();
     }

     static int NumLayers(GrLayerCache* cache) {
         return cache->numLayers();
     }
     static void Purge(GrLayerCache* cache, uint32_t pictureID) {
         cache->purge(pictureID);
     }
     static int Uses(GrCachedLayer* layer) {
         return layer->uses();
     }
     static GrCachedLayer* Find(GrLayerCache* cache, uint32_t pictureID,
                                const SkMatrix& initialMat,
                                const int* key, int keySize) {
         return cache->findLayer(pictureID, initialMat, key, keySize);
     }
 };

 // 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) {
         int key[1] = { idOffset+i+1 };
         GrCachedLayer* layer = cache->findLayerOrCreate(picture.uniqueID(),
                                                         idOffset+i+1, idOffset+i+2,
                                                         SkIRect::MakeEmpty(),
                                                         SkIRect::MakeEmpty(),
                                                         SkMatrix::I(),
                                                         key, 1,
                                                         nullptr);
         REPORTER_ASSERT(reporter, layer);
         GrCachedLayer* temp = TestingAccess::Find(cache, picture.uniqueID(), SkMatrix::I(),
                                                   key, 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, !layer->texture());
         REPORTER_ASSERT(reporter, !layer->paint());
         REPORTER_ASSERT(reporter, !layer->isAtlased());
     }
 }

 static void lock_layer(skiatest::Reporter* reporter,
                        GrLayerCache* cache,
                        GrCachedLayer* layer) {
     // Make each layer big enough to consume one whole plot in the atlas
     GrSurfaceDesc desc;
     desc.fFlags = kRenderTarget_GrSurfaceFlag;
     desc.fWidth = TestingAccess::PlotSize().fWidth;
     desc.fHeight = TestingAccess::PlotSize().fHeight;
     desc.fConfig = kSkia8888_GrPixelConfig;

     bool needsRerendering;
     bool inAtlas = cache->tryToAtlas(layer, desc, &needsRerendering);
     if (!inAtlas) {
         cache->lock(layer, desc, &needsRerendering);
     }
     REPORTER_ASSERT(reporter, needsRerendering);

     cache->lock(layer, desc, &needsRerendering);
     REPORTER_ASSERT(reporter, !needsRerendering);

     REPORTER_ASSERT(reporter, layer->texture());
     REPORTER_ASSERT(reporter, layer->locked());

     cache->addUse(layer);

     REPORTER_ASSERT(reporter, 1 == TestingAccess::Uses(layer));
 }

 // 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_FOR_RENDERING_CONTEXTS(GpuLayerCache, reporter, ctxInfo) {
     // Add one more layer than can fit in the atlas
     static const int kInitialNumLayers = TestingAccess::NumPlots() + 1;

 #if GR_CACHE_STATS
     GrResourceCache::Stats stats;
 #endif

     sk_sp<SkPicture> picture;

     {
         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());
         picture = recorder.finishRecordingAsPicture();
     }

     GrResourceCache* resourceCache = ctxInfo.grContext()->getResourceCache();

     GrLayerCache cache(ctxInfo.grContext());

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

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

         lock_layer(reporter, &cache, layer);

 #if GR_CACHE_STATS
         resourceCache->getStats(&stats);
 #endif

         // The first 4 layers should be in the atlas (and thus have non-empty rects)
         if (i < TestingAccess::NumPlots()) {
             REPORTER_ASSERT(reporter, layer->isAtlased());
 #if GR_CACHE_STATS
             REPORTER_ASSERT(reporter, 1 == stats.fTotal);
 #endif
         } else {
             // The 5th layer couldn't fit in the atlas
             REPORTER_ASSERT(reporter, !layer->isAtlased());
 #if GR_CACHE_STATS
             REPORTER_ASSERT(reporter, 2 == stats.fTotal);
 #endif
         }
     }

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

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

 #if GR_CACHE_STATS
     resourceCache->getStats(&stats);
     REPORTER_ASSERT(reporter, 2 == stats.fTotal);
     // The floating layer is purgeable the cache is not
     REPORTER_ASSERT(reporter, 1 == stats.fNumPurgeable);
     REPORTER_ASSERT(reporter, 1 == stats.fNumNonPurgeable);
 #endif

     for (int i = 0; i < kInitialNumLayers; ++i) {
         int key[1] = { i+1 };

         GrCachedLayer* layer = TestingAccess::Find(&cache, picture->uniqueID(), SkMatrix::I(),
                                                    key, 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, !layer->texture());
             REPORTER_ASSERT(reporter, !layer->isAtlased());
 #if GR_CACHE_HOISTED_LAYERS
         }
 #endif
     }

     // Let go of the backing texture
     cache.end();
     REPORTER_ASSERT(reporter, nullptr == TestingAccess::GetBackingTexture(&cache));

 #if GR_CACHE_STATS
     resourceCache->getStats(&stats);
     REPORTER_ASSERT(reporter, 2 == stats.fTotal);
     // Now both the floater and the atlas are purgeable
     REPORTER_ASSERT(reporter, 2 == stats.fNumPurgeable);
 #endif

     // re-attach to the backing texture
     cache.begin();
     REPORTER_ASSERT(reporter, TestingAccess::GetBackingTexture(&cache));

 #if GR_CACHE_STATS
     resourceCache->getStats(&stats);
     REPORTER_ASSERT(reporter, 2 == stats.fTotal);
     // The atlas is restored to being non-purgeable
     REPORTER_ASSERT(reporter, 1 == stats.fNumPurgeable);
     REPORTER_ASSERT(reporter, 1 == stats.fNumNonPurgeable);
 #endif

     {
         int key[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(),
                                                    key, 1);
         REPORTER_ASSERT(reporter, layer);

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

     for (int i = 0; i < kInitialNumLayers+1; ++i) {
         int key[1] = { i+1 };

         GrCachedLayer* layer = TestingAccess::Find(&cache, picture->uniqueID(), SkMatrix::I(),
                                                    key, 1);
 #if GR_CACHE_HOISTED_LAYERS
         // 3 old layers plus the new one should be in the atlas.
         if (1 == i || 2 == i || 3 == i || 5 == i) {
             REPORTER_ASSERT(reporter, layer);
             REPORTER_ASSERT(reporter, !layer->locked());
             REPORTER_ASSERT(reporter, layer->texture());
             REPORTER_ASSERT(reporter, layer->isAtlased());
         } else if (4 == i) {
 #endif
             // The one that was never atlased should still be around
             REPORTER_ASSERT(reporter, layer);

             REPORTER_ASSERT(reporter, !layer->texture());
             REPORTER_ASSERT(reporter, !layer->isAtlased());
 #if GR_CACHE_HOISTED_LAYERS
         } else {
             // The one bumped out of the atlas (i.e., 0) should be gone
             REPORTER_ASSERT(reporter, nullptr == layer);
         }
 #endif
     }

     //--------------------------------------------------------------------
     // Free them all SkGpuDevice-style. This will not free up the
     // atlas' texture but will eliminate all the layers.
     TestingAccess::Purge(&cache, picture->uniqueID());

     REPORTER_ASSERT(reporter, TestingAccess::NumLayers(&cache) == 0);

 #if GR_CACHE_STATS
     resourceCache->getStats(&stats);
     REPORTER_ASSERT(reporter, 2 == stats.fTotal);
     // Atlas isn't purgeable
     REPORTER_ASSERT(reporter, 1 == stats.fNumPurgeable);
     REPORTER_ASSERT(reporter, 1 == stats.fNumNonPurgeable);
 #endif

     //--------------------------------------------------------------------
     // Test out the GrContext-style purge. This should remove all the layers
     // and the atlas.
     // Re-create the layers
     create_layers(reporter, &cache, *picture, kInitialNumLayers, 0);

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

     REPORTER_ASSERT(reporter, TestingAccess::NumLayers(&cache) == 0);

     REPORTER_ASSERT(reporter, nullptr == TestingAccess::GetBackingTexture(&cache));

 #if GR_CACHE_STATS
     resourceCache->getStats(&stats);
     REPORTER_ASSERT(reporter, 2 == stats.fTotal);
     REPORTER_ASSERT(reporter, 2 == stats.fNumPurgeable);
 #endif

     // Purge the resource cache ...
     resourceCache->purgeAllUnlocked();

 #if GR_CACHE_STATS
     resourceCache->getStats(&stats);
     REPORTER_ASSERT(reporter, 0 == stats.fTotal);
 #endif

     // and try to re-attach to the backing texture. This should fail
     cache.begin();
     REPORTER_ASSERT(reporter, nullptr == TestingAccess::GetBackingTexture(&cache));

     //--------------------------------------------------------------------
     // Test out the MessageBus-style purge. This will not free the atlas
     // but should eliminate the free-floating layers.
     create_layers(reporter, &cache, *picture, kInitialNumLayers, 0);

     // Allocate/use the layers
     for (int i = 0; i < kInitialNumLayers; ++i) {
         int key[1] = { i + 1 };
         GrCachedLayer* layer = TestingAccess::Find(&cache, picture->uniqueID(), SkMatrix::I(),
                                                    key, 1);
         REPORTER_ASSERT(reporter, layer);

         lock_layer(reporter, &cache, layer);
     }

 #if GR_CACHE_STATS
     resourceCache->getStats(&stats);
     REPORTER_ASSERT(reporter, 2 == stats.fTotal);
     REPORTER_ASSERT(reporter, 2 == stats.fNumNonPurgeable);
 #endif

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

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

     picture.reset(nullptr);
     cache.processDeletedPictures();

     REPORTER_ASSERT(reporter, TestingAccess::NumLayers(&cache) == 0);

 #if GR_CACHE_STATS
     resourceCache->getStats(&stats);
     REPORTER_ASSERT(reporter, 2 == stats.fTotal);
     REPORTER_ASSERT(reporter, 1 == stats.fNumPurgeable);
     REPORTER_ASSERT(reporter, 1 == stats.fNumNonPurgeable);
 #endif

     cache.end();

 #if GR_CACHE_STATS
     resourceCache->getStats(&stats);
     REPORTER_ASSERT(reporter, 2 == stats.fTotal);
     REPORTER_ASSERT(reporter, 2 == stats.fNumPurgeable);
 #endif
 }

 #endif
 #endif
	/*
	* Copyright 2014 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	// Disabling this test since it is for the layer hoister which is current disabled.
	// The test fails when we add a discard to a newly created render target.
	#if 0

	#if SK_SUPPORT_GPU

	#include "GrContext.h"
	#include "GrLayerCache.h"
	#include "GrResourceCache.h"
	#include "SkPictureRecorder.h"
	#include "Test.h"

	class TestingAccess {
	public:
	static int NumPlots() {
	return GrLayerCache::kNumPlotsX * GrLayerCache::kNumPlotsY;
	}
	static SkISize PlotSize() {
	return SkISize::Make(GrLayerCache::kAtlasTextureWidth / GrLayerCache::kNumPlotsX,
	GrLayerCache::kAtlasTextureHeight / GrLayerCache::kNumPlotsY);
	}

	static GrTexture* GetBackingTexture(GrLayerCache* cache) {
	return cache->fAtlas->getTextureOrNull();
	}

	static int NumLayers(GrLayerCache* cache) {
	return cache->numLayers();
	}
	static void Purge(GrLayerCache* cache, uint32_t pictureID) {
	cache->purge(pictureID);
	}
	static int Uses(GrCachedLayer* layer) {
	return layer->uses();
	}
	static GrCachedLayer* Find(GrLayerCache* cache, uint32_t pictureID,
	const SkMatrix& initialMat,
	const int* key, int keySize) {
	return cache->findLayer(pictureID, initialMat, key, keySize);
	}
	};

	// 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) {
	int key[1] = { idOffset+i+1 };
	GrCachedLayer* layer = cache->findLayerOrCreate(picture.uniqueID(),
	idOffset+i+1, idOffset+i+2,
	SkIRect::MakeEmpty(),
	SkIRect::MakeEmpty(),
	SkMatrix::I(),
	key, 1,
	nullptr);
	REPORTER_ASSERT(reporter, layer);
	GrCachedLayer* temp = TestingAccess::Find(cache, picture.uniqueID(), SkMatrix::I(),
	key, 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, !layer->texture());
	REPORTER_ASSERT(reporter, !layer->paint());
	REPORTER_ASSERT(reporter, !layer->isAtlased());
	}
	}

	static void lock_layer(skiatest::Reporter* reporter,
	GrLayerCache* cache,
	GrCachedLayer* layer) {
	// Make each layer big enough to consume one whole plot in the atlas
	GrSurfaceDesc desc;
	desc.fFlags = kRenderTarget_GrSurfaceFlag;
	desc.fWidth = TestingAccess::PlotSize().fWidth;
	desc.fHeight = TestingAccess::PlotSize().fHeight;
	desc.fConfig = kSkia8888_GrPixelConfig;

	bool needsRerendering;
	bool inAtlas = cache->tryToAtlas(layer, desc, &needsRerendering);
	if (!inAtlas) {
	cache->lock(layer, desc, &needsRerendering);
	}
	REPORTER_ASSERT(reporter, needsRerendering);

	cache->lock(layer, desc, &needsRerendering);
	REPORTER_ASSERT(reporter, !needsRerendering);

	REPORTER_ASSERT(reporter, layer->texture());
	REPORTER_ASSERT(reporter, layer->locked());

	cache->addUse(layer);

	REPORTER_ASSERT(reporter, 1 == TestingAccess::Uses(layer));
	}

	// 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_FOR_RENDERING_CONTEXTS(GpuLayerCache, reporter, ctxInfo) {
	// Add one more layer than can fit in the atlas
	static const int kInitialNumLayers = TestingAccess::NumPlots() + 1;

	#if GR_CACHE_STATS
	GrResourceCache::Stats stats;
	#endif

	sk_sp<SkPicture> picture;

	{
	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());
	picture = recorder.finishRecordingAsPicture();
	}

	GrResourceCache* resourceCache = ctxInfo.grContext()->getResourceCache();

	GrLayerCache cache(ctxInfo.grContext());

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

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

	lock_layer(reporter, &cache, layer);

	#if GR_CACHE_STATS
	resourceCache->getStats(&stats);
	#endif

	// The first 4 layers should be in the atlas (and thus have non-empty rects)
	if (i < TestingAccess::NumPlots()) {
	REPORTER_ASSERT(reporter, layer->isAtlased());
	#if GR_CACHE_STATS
	REPORTER_ASSERT(reporter, 1 == stats.fTotal);
	#endif
	} else {
	// The 5th layer couldn't fit in the atlas
	REPORTER_ASSERT(reporter, !layer->isAtlased());
	#if GR_CACHE_STATS
	REPORTER_ASSERT(reporter, 2 == stats.fTotal);
	#endif
	}
	}

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

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

	#if GR_CACHE_STATS
	resourceCache->getStats(&stats);
	REPORTER_ASSERT(reporter, 2 == stats.fTotal);
	// The floating layer is purgeable the cache is not
	REPORTER_ASSERT(reporter, 1 == stats.fNumPurgeable);
	REPORTER_ASSERT(reporter, 1 == stats.fNumNonPurgeable);
	#endif

	for (int i = 0; i < kInitialNumLayers; ++i) {
	int key[1] = { i+1 };

	GrCachedLayer* layer = TestingAccess::Find(&cache, picture->uniqueID(), SkMatrix::I(),
	key, 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, !layer->texture());
	REPORTER_ASSERT(reporter, !layer->isAtlased());
	#if GR_CACHE_HOISTED_LAYERS
	}
	#endif
	}

	// Let go of the backing texture
	cache.end();
	REPORTER_ASSERT(reporter, nullptr == TestingAccess::GetBackingTexture(&cache));

	#if GR_CACHE_STATS
	resourceCache->getStats(&stats);
	REPORTER_ASSERT(reporter, 2 == stats.fTotal);
	// Now both the floater and the atlas are purgeable
	REPORTER_ASSERT(reporter, 2 == stats.fNumPurgeable);
	#endif

	// re-attach to the backing texture
	cache.begin();
	REPORTER_ASSERT(reporter, TestingAccess::GetBackingTexture(&cache));

	#if GR_CACHE_STATS
	resourceCache->getStats(&stats);
	REPORTER_ASSERT(reporter, 2 == stats.fTotal);
	// The atlas is restored to being non-purgeable
	REPORTER_ASSERT(reporter, 1 == stats.fNumPurgeable);
	REPORTER_ASSERT(reporter, 1 == stats.fNumNonPurgeable);
	#endif

	{
	int key[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(),
	key, 1);
	REPORTER_ASSERT(reporter, layer);

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

	for (int i = 0; i < kInitialNumLayers+1; ++i) {
	int key[1] = { i+1 };

	GrCachedLayer* layer = TestingAccess::Find(&cache, picture->uniqueID(), SkMatrix::I(),
	key, 1);
	#if GR_CACHE_HOISTED_LAYERS
	// 3 old layers plus the new one should be in the atlas.
	if (1 == i \|\| 2 == i \|\| 3 == i \|\| 5 == i) {
	REPORTER_ASSERT(reporter, layer);
	REPORTER_ASSERT(reporter, !layer->locked());
	REPORTER_ASSERT(reporter, layer->texture());
	REPORTER_ASSERT(reporter, layer->isAtlased());
	} else if (4 == i) {
	#endif
	// The one that was never atlased should still be around
	REPORTER_ASSERT(reporter, layer);

	REPORTER_ASSERT(reporter, !layer->texture());
	REPORTER_ASSERT(reporter, !layer->isAtlased());
	#if GR_CACHE_HOISTED_LAYERS
	} else {
	// The one bumped out of the atlas (i.e., 0) should be gone
	REPORTER_ASSERT(reporter, nullptr == layer);
	}
	#endif
	}

	//--------------------------------------------------------------------
	// Free them all SkGpuDevice-style. This will not free up the
	// atlas' texture but will eliminate all the layers.
	TestingAccess::Purge(&cache, picture->uniqueID());

	REPORTER_ASSERT(reporter, TestingAccess::NumLayers(&cache) == 0);

	#if GR_CACHE_STATS
	resourceCache->getStats(&stats);
	REPORTER_ASSERT(reporter, 2 == stats.fTotal);
	// Atlas isn't purgeable
	REPORTER_ASSERT(reporter, 1 == stats.fNumPurgeable);
	REPORTER_ASSERT(reporter, 1 == stats.fNumNonPurgeable);
	#endif

	//--------------------------------------------------------------------
	// Test out the GrContext-style purge. This should remove all the layers
	// and the atlas.
	// Re-create the layers
	create_layers(reporter, &cache, *picture, kInitialNumLayers, 0);

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

	REPORTER_ASSERT(reporter, TestingAccess::NumLayers(&cache) == 0);

	REPORTER_ASSERT(reporter, nullptr == TestingAccess::GetBackingTexture(&cache));

	#if GR_CACHE_STATS
	resourceCache->getStats(&stats);
	REPORTER_ASSERT(reporter, 2 == stats.fTotal);
	REPORTER_ASSERT(reporter, 2 == stats.fNumPurgeable);
	#endif

	// Purge the resource cache ...
	resourceCache->purgeAllUnlocked();

	#if GR_CACHE_STATS
	resourceCache->getStats(&stats);
	REPORTER_ASSERT(reporter, 0 == stats.fTotal);
	#endif

	// and try to re-attach to the backing texture. This should fail
	cache.begin();
	REPORTER_ASSERT(reporter, nullptr == TestingAccess::GetBackingTexture(&cache));

	//--------------------------------------------------------------------
	// Test out the MessageBus-style purge. This will not free the atlas
	// but should eliminate the free-floating layers.
	create_layers(reporter, &cache, *picture, kInitialNumLayers, 0);

	// Allocate/use the layers
	for (int i = 0; i < kInitialNumLayers; ++i) {
	int key[1] = { i + 1 };
	GrCachedLayer* layer = TestingAccess::Find(&cache, picture->uniqueID(), SkMatrix::I(),
	key, 1);
	REPORTER_ASSERT(reporter, layer);

	lock_layer(reporter, &cache, layer);
	}

	#if GR_CACHE_STATS
	resourceCache->getStats(&stats);
	REPORTER_ASSERT(reporter, 2 == stats.fTotal);
	REPORTER_ASSERT(reporter, 2 == stats.fNumNonPurgeable);
	#endif

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

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

	picture.reset(nullptr);
	cache.processDeletedPictures();

	REPORTER_ASSERT(reporter, TestingAccess::NumLayers(&cache) == 0);

	#if GR_CACHE_STATS
	resourceCache->getStats(&stats);
	REPORTER_ASSERT(reporter, 2 == stats.fTotal);
	REPORTER_ASSERT(reporter, 1 == stats.fNumPurgeable);
	REPORTER_ASSERT(reporter, 1 == stats.fNumNonPurgeable);
	#endif

	cache.end();

	#if GR_CACHE_STATS
	resourceCache->getStats(&stats);
	REPORTER_ASSERT(reporter, 2 == stats.fTotal);
	REPORTER_ASSERT(reporter, 2 == stats.fNumPurgeable);
	#endif
	}

	#endif
	#endif