Revert of Replace GrResourceCache with GrResourceCache2.

src/gpu/GrResourceCache.cpp

Index: src/gpu/GrResourceCache.cpp
diff --git a/src/gpu/GrResourceCache.cpp b/src/gpu/GrResourceCache.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a73d11703db0ddd1686916fd8634b340e12661cf
--- /dev/null
+++ b/src/gpu/GrResourceCache.cpp
@@ -0,0 +1,393 @@
+
+/*
+ * Copyright 2010 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrResourceCache.h"
+#include "GrGpuResource.h"
+#include "GrGpuResourceCacheAccess.h"
+#include "GrTexturePriv.h"
+
+DECLARE_SKMESSAGEBUS_MESSAGE(GrResourceInvalidatedMessage);
+
+///////////////////////////////////////////////////////////////////////////////
+
+void GrGpuResource::didChangeGpuMemorySize() const {
+    fGpuMemorySize = kInvalidGpuMemorySize;
+    if (this->cacheAccess().isInCache()) {
+        fCacheEntry->didChangeResourceSize();
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+GrResourceKey::ResourceType GrResourceKey::GenerateResourceType() {
+    static int32_t gNextType = 0;
+
+    int32_t type = sk_atomic_inc(&gNextType);
+    if (type >= (1 << 8 * sizeof(ResourceType))) {
+        SkFAIL("Too many Resource Types");
+    }
+
+    return static_cast<ResourceType>(type);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+GrResourceCacheEntry::GrResourceCacheEntry(GrResourceCache* resourceCache, GrGpuResource* resource)
+        : fResourceCache(resourceCache),
+          fResource(resource),
+          fCachedSize(resource->gpuMemorySize()) {
+    // we assume ownership of the resource, and will unref it when we die
+    SkASSERT(resource);
+    resource->ref();
+}
+
+GrResourceCacheEntry::~GrResourceCacheEntry() {
+    // We're relying on having the cache entry to remove this from GrResourceCache2's content hash.
+    // fResource->setCacheEntry(NULL);
+    fResource->unref();
+}
+
+#ifdef SK_DEBUG
+void GrResourceCacheEntry::validate() const {
+    SkASSERT(fResourceCache);
+    SkASSERT(fResource);
+    SkASSERT(fResource->cacheAccess().getCacheEntry() == this);
+    SkASSERT(fResource->gpuMemorySize() == fCachedSize);
+    fResource->validate();
+}
+#endif
+
+void GrResourceCacheEntry::didChangeResourceSize() {
+    size_t oldSize = fCachedSize;
+    fCachedSize = fResource->gpuMemorySize();
+    if (fCachedSize > oldSize) {
+        fResourceCache->didIncreaseResourceSize(this, fCachedSize - oldSize);
+    } else if (fCachedSize < oldSize) {
+        fResourceCache->didDecreaseResourceSize(this, oldSize - fCachedSize);
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+GrResourceCache::GrResourceCache(const GrDrawTargetCaps* caps, int maxCount, size_t maxBytes)
+    : fMaxCount(maxCount)
+    , fMaxBytes(maxBytes)
+    , fCaps(SkRef(caps)) {
+#if GR_CACHE_STATS
+    fHighWaterEntryCount          = 0;
+    fHighWaterEntryBytes          = 0;
+#endif
+
+    fEntryCount                   = 0;
+    fEntryBytes                   = 0;
+
+    fPurging                      = false;
+
+    fOverbudgetCB                 = NULL;
+    fOverbudgetData               = NULL;
+}
+
+GrResourceCache::~GrResourceCache() {
+    GrAutoResourceCacheValidate atcv(this);
+
+    EntryList::Iter iter;
+
+    // Unlike the removeAll, here we really remove everything, including locked resources.
+    while (GrResourceCacheEntry* entry = fList.head()) {
+        GrAutoResourceCacheValidate atcv(this);
+
+        // remove from our llist
+        this->internalDetach(entry);
+
+        delete entry;
+    }
+}
+
+void GrResourceCache::getLimits(int* maxResources, size_t* maxResourceBytes) const{
+    if (maxResources) {
+        *maxResources = fMaxCount;
+    }
+    if (maxResourceBytes) {
+        *maxResourceBytes = fMaxBytes;
+    }
+}
+
+void GrResourceCache::setLimits(int maxResources, size_t maxResourceBytes) {
+    bool smaller = (maxResources < fMaxCount) || (maxResourceBytes < fMaxBytes);
+
+    fMaxCount = maxResources;
+    fMaxBytes = maxResourceBytes;
+
+    if (smaller) {
+        this->purgeAsNeeded();
+    }
+}
+
+void GrResourceCache::internalDetach(GrResourceCacheEntry* entry) {
+    fList.remove(entry);
+    fEntryCount -= 1;
+    fEntryBytes -= entry->fCachedSize;
+}
+
+void GrResourceCache::attachToHead(GrResourceCacheEntry* entry) {
+    fList.addToHead(entry);
+
+    fEntryCount += 1;
+    fEntryBytes += entry->fCachedSize;
+
+#if GR_CACHE_STATS
+    if (fHighWaterEntryCount < fEntryCount) {
+        fHighWaterEntryCount = fEntryCount;
+    }
+    if (fHighWaterEntryBytes < fEntryBytes) {
+        fHighWaterEntryBytes = fEntryBytes;
+    }
+#endif
+}
+
+
+void GrResourceCache::makeResourceMRU(GrGpuResource* resource) {
+    GrResourceCacheEntry* entry = resource->cacheAccess().getCacheEntry();
+    if (entry) {
+        this->internalDetach(entry);
+        this->attachToHead(entry);
+    }
+}
+
+void GrResourceCache::notifyPurgable(const GrGpuResource* resource) {
+    // Remove scratch textures from the cache the moment they become purgeable if
+    // scratch texture reuse is turned off.
+    SkASSERT(resource->cacheAccess().getCacheEntry());
+    if (resource->cacheAccess().isScratch()) {
+        const GrResourceKey& key = resource->cacheAccess().getScratchKey();
+        if (key.getResourceType() == GrTexturePriv::ResourceType() &&
+            !fCaps->reuseScratchTextures() &&
+            !(static_cast<const GrSurface*>(resource)->desc().fFlags & kRenderTarget_GrSurfaceFlag)) {
+            this->deleteResource(resource->cacheAccess().getCacheEntry());
+        }
+    }
+}
+
+bool GrResourceCache::addResource(const GrResourceKey& key, GrGpuResource* resource) {
+    if (NULL != resource->cacheAccess().getCacheEntry()) {
+        return false;
+    }
+    
+    if (key.isScratch()) {
+        SkASSERT(resource->cacheAccess().isScratch());
+        SkASSERT(key == resource->cacheAccess().getScratchKey());
+    } else {
+        if (!resource->cacheAccess().setContentKey(key)) {
+            return false;
+        }
+    }
+
+    // we don't expect to create new resources during a purge. In theory
+    // this could cause purgeAsNeeded() into an infinite loop (e.g.
+    // each resource destroyed creates and locks 2 resources and
+    // unlocks 1 thereby causing a new purge).
+    SkASSERT(!fPurging);
+    GrAutoResourceCacheValidate atcv(this);
+
+    GrResourceCacheEntry* entry = SkNEW_ARGS(GrResourceCacheEntry, (this, resource));
+    resource->cacheAccess().setCacheEntry(entry);
+
+    this->attachToHead(entry);
+    this->purgeAsNeeded();
+    return true;
+}
+
+void GrResourceCache::didIncreaseResourceSize(const GrResourceCacheEntry* entry, size_t amountInc) {
+    fEntryBytes += amountInc;
+    this->purgeAsNeeded();
+}
+
+void GrResourceCache::didDecreaseResourceSize(const GrResourceCacheEntry* entry, size_t amountDec) {
+    fEntryBytes -= amountDec;
+#ifdef SK_DEBUG
+    this->validate();
+#endif
+}
+
+/**
+ * Destroying a resource may potentially trigger the unlock of additional
+ * resources which in turn will trigger a nested purge. We block the nested
+ * purge using the fPurging variable. However, the initial purge will keep
+ * looping until either all resources in the cache are unlocked or we've met
+ * the budget. There is an assertion in createAndLock to check against a
+ * resource's destructor inserting new resources into the cache. If these
+ * new resources were unlocked before purgeAsNeeded completed it could
+ * potentially make purgeAsNeeded loop infinitely.
+ *
+ * extraCount and extraBytes are added to the current resource totals to account
+ * for incoming resources (e.g., GrContext is about to add 10MB split between
+ * 10 textures).
+ */
+void GrResourceCache::purgeAsNeeded(int extraCount, size_t extraBytes) {
+    if (fPurging) {
+        return;
+    }
+
+    fPurging = true;
+
+    this->internalPurge(extraCount, extraBytes);
+    if (((fEntryCount+extraCount) > fMaxCount ||
+        (fEntryBytes+extraBytes) > fMaxBytes) &&
+        fOverbudgetCB) {
+        // Despite the purge we're still over budget. See if Ganesh can
+        // release some resources and purge again.
+        if ((*fOverbudgetCB)(fOverbudgetData)) {
+            this->internalPurge(extraCount, extraBytes);
+        }
+    }
+
+    fPurging = false;
+}
+
+void GrResourceCache::purgeInvalidated() {
+    // TODO: Implement this in GrResourceCache2.
+}
+
+void GrResourceCache::deleteResource(GrResourceCacheEntry* entry) {
+    SkASSERT(entry->fResource->isPurgable());
+    // remove from our llist
+    this->internalDetach(entry);
+    delete entry;
+}
+
+void GrResourceCache::internalPurge(int extraCount, size_t extraBytes) {
+    SkASSERT(fPurging);
+
+    bool withinBudget = false;
+    bool changed = false;
+
+    // The purging process is repeated several times since one pass
+    // may free up other resources
+    do {
+        EntryList::Iter iter;
+
+        changed = false;
+
+        // Note: the following code relies on the fact that the
+        // doubly linked list doesn't invalidate its data/pointers
+        // outside of the specific area where a deletion occurs (e.g.,
+        // in internalDetach)
+        GrResourceCacheEntry* entry = iter.init(fList, EntryList::Iter::kTail_IterStart);
+
+        while (entry) {
+            GrAutoResourceCacheValidate atcv(this);
+
+            if ((fEntryCount+extraCount) <= fMaxCount &&
+                (fEntryBytes+extraBytes) <= fMaxBytes) {
+                withinBudget = true;
+                break;
+            }
+
+            GrResourceCacheEntry* prev = iter.prev();
+            if (entry->fResource->isPurgable()) {
+                changed = true;
+                this->deleteResource(entry);
+            }
+            entry = prev;
+        }
+    } while (!withinBudget && changed);
+}
+
+void GrResourceCache::purgeAllUnlocked() {
+    GrAutoResourceCacheValidate atcv(this);
+
+    // we can have one GrCacheable holding a lock on another
+    // so we don't want to just do a simple loop kicking each
+    // entry out. Instead change the budget and purge.
+
+    size_t savedMaxBytes = fMaxBytes;
+    int savedMaxCount = fMaxCount;
+    fMaxBytes = (size_t) -1;
+    fMaxCount = 0;
+    this->purgeAsNeeded();
+
+    fMaxBytes = savedMaxBytes;
+    fMaxCount = savedMaxCount;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+#ifdef SK_DEBUG
+size_t GrResourceCache::countBytes(const EntryList& list) {
+    size_t bytes = 0;
+
+    EntryList::Iter iter;
+
+    const GrResourceCacheEntry* entry = iter.init(const_cast<EntryList&>(list),
+                                                  EntryList::Iter::kTail_IterStart);
+
+    for ( ; entry; entry = iter.prev()) {
+        bytes += entry->resource()->gpuMemorySize();
+    }
+    return bytes;
+}
+
+static bool both_zero_or_nonzero(int count, size_t bytes) {
+    return (count == 0 && bytes == 0) || (count > 0 && bytes > 0);
+}
+
+void GrResourceCache::validate() const {
+    fList.validate();
+    SkASSERT(both_zero_or_nonzero(fEntryCount, fEntryBytes));
+
+    EntryList::Iter iter;
+
+    // check that the shareable entries are okay
+    const GrResourceCacheEntry* entry = iter.init(const_cast<EntryList&>(fList),
+                                                  EntryList::Iter::kHead_IterStart);
+
+    int count = 0;
+    for ( ; entry; entry = iter.next()) {
+        entry->validate();
+        count += 1;
+    }
+    SkASSERT(count == fEntryCount);
+
+    size_t bytes = this->countBytes(fList);
+    SkASSERT(bytes == fEntryBytes);
+    SkASSERT(fList.countEntries() == fEntryCount);
+}
+#endif // SK_DEBUG
+
+#if GR_CACHE_STATS
+
+void GrResourceCache::printStats() {
+    int locked = 0;
+    int scratch = 0;
+
+    EntryList::Iter iter;
+
+    GrResourceCacheEntry* entry = iter.init(fList, EntryList::Iter::kTail_IterStart);
+
+    for ( ; entry; entry = iter.prev()) {
+        if (!entry->fResource->isPurgable()) {
+            ++locked;
+        }
+        if (entry->fResource->cacheAccess().isScratch()) {
+            ++scratch;
+        }
+    }
+
+    float countUtilization = (100.f * fEntryCount) / fMaxCount;
+    float byteUtilization = (100.f * fEntryBytes) / fMaxBytes;
+
+    SkDebugf("Budget: %d items %d bytes\n", fMaxCount, fMaxBytes);
+    SkDebugf("\t\tEntry Count: current %d (%d locked, %d scratch %.2g%% full), high %d\n",
+                fEntryCount, locked, scratch, countUtilization, fHighWaterEntryCount);
+    SkDebugf("\t\tEntry Bytes: current %d (%.2g%% full) high %d\n",
+                fEntryBytes, byteUtilization, fHighWaterEntryBytes);
+}
+
+#endif
+
+///////////////////////////////////////////////////////////////////////////////