Encourage IOSurface reuse for CSS filter effects.

cc/resources/resource_pool.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_RESOURCES_RESOURCE_POOL_H_
 #define CC_RESOURCES_RESOURCE_POOL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <deque>
 #include <map>
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/trace_event/memory_dump_provider.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/renderer.h"
 #include "cc/resources/resource.h"
 #include "cc/resources/resource_format.h"
 #include "cc/resources/scoped_resource.h"
 
 namespace cc {
 
 class CC_EXPORT ResourcePool : public base::trace_event::MemoryDumpProvider {
  public:
+  // Delay before a resource is considered expired.
+  static base::TimeDelta kDefaultExpirationDelay;
+
   static std::unique_ptr<ResourcePool> CreateForGpuMemoryBufferResources(
       ResourceProvider* resource_provider,
       base::SingleThreadTaskRunner* task_runner,
-      gfx::BufferUsage usage) {
-    std::unique_ptr<ResourcePool> pool(
-        new ResourcePool(resource_provider, task_runner, true));
+      gfx::BufferUsage usage,
+      const base::TimeDelta& expiration_delay) {
+    std::unique_ptr<ResourcePool> pool(new ResourcePool(
+        resource_provider, task_runner, true, expiration_delay));
     pool->usage_ = usage;
     return pool;
   }
 
   static std::unique_ptr<ResourcePool> Create(
       ResourceProvider* resource_provider,
-      base::SingleThreadTaskRunner* task_runner) {
-    return base::WrapUnique(
-        new ResourcePool(resource_provider, task_runner, false));
+      base::SingleThreadTaskRunner* task_runner,
+      const base::TimeDelta& expiration_delay) {
+    return base::WrapUnique(new ResourcePool(resource_provider, task_runner,
+                                             false, expiration_delay));
   }
 
   ~ResourcePool() override;
 
   // Tries to reuse a resource. If none are available, makes a new one.
   Resource* AcquireResource(const gfx::Size& size,
                             ResourceFormat format,
                             const gfx::ColorSpace& color_space);
 
   // Tries to acquire the resource with |previous_content_id| for us in partial
@@ skipping 28 matching lines @@
 
   size_t GetTotalMemoryUsageForTesting() const {
     return total_memory_usage_bytes_;
   }
   size_t GetTotalResourceCountForTesting() const {
     return total_resource_count_;
   }
   size_t GetBusyResourceCountForTesting() const {
     return busy_resources_.size();
   }
-  void SetResourceExpirationDelayForTesting(base::TimeDelta delay) {
-    resource_expiration_delay_ = delay;
-  }
 
  protected:
   ResourcePool(ResourceProvider* resource_provider,
                base::SingleThreadTaskRunner* task_runner,
-               bool use_gpu_memory_buffers);
+               bool use_gpu_memory_buffers,
+               const base::TimeDelta& expiration_delay);
 
   bool ResourceUsageTooHigh();
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ResourcePoolTest, ReuseResource);
   class PoolResource : public ScopedResource {
    public:
     static std::unique_ptr<PoolResource> Create(
         ResourceProvider* resource_provider) {
       return base::WrapUnique(new PoolResource(resource_provider));
@@ skipping 57 matching lines @@
   // Holds most recently used resources at the front of the queue.
   using ResourceDeque = std::deque<std::unique_ptr<PoolResource>>;
   ResourceDeque unused_resources_;
   ResourceDeque busy_resources_;
 
   using InUseResourceMap = std::map<ResourceId, std::unique_ptr<PoolResource>>;
   InUseResourceMap in_use_resources_;
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   bool evict_expired_resources_pending_;
-  base::TimeDelta resource_expiration_delay_;
+  const base::TimeDelta resource_expiration_delay_;
 
   base::WeakPtrFactory<ResourcePool> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourcePool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_POOL_H_