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// 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_PRIORITIZED_RESOURCE_H_
#define CC_RESOURCES_PRIORITIZED_RESOURCE_H_
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "cc/base/cc_export.h"
#include "cc/resources/priority_calculator.h"
#include "cc/resources/resource.h"
#include "cc/resources/resource_provider.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/size.h"
#include "ui/gfx/vector2d.h"
namespace cc {
class PrioritizedResourceManager;
class Proxy;
class CC_EXPORT PrioritizedResource {
public:
static scoped_ptr<PrioritizedResource> Create(
PrioritizedResourceManager* manager,
const gfx::Size& size,
ResourceFormat format) {
return make_scoped_ptr(new PrioritizedResource(manager, size, format));
}
static scoped_ptr<PrioritizedResource> Create(
PrioritizedResourceManager* manager) {
return make_scoped_ptr(
new PrioritizedResource(manager, gfx::Size(), RGBA_8888));
}
~PrioritizedResource();
// Texture properties. Changing these causes the backing texture to be lost.
// Setting these to the same value is a no-op.
void SetTextureManager(PrioritizedResourceManager* manager);
PrioritizedResourceManager* resource_manager() { return manager_; }
void SetDimensions(const gfx::Size& size, ResourceFormat format);
ResourceFormat format() const { return format_; }
gfx::Size size() const { return size_; }
size_t bytes() const { return bytes_; }
bool contents_swizzled() const { return contents_swizzled_; }
// Set priority for the requested texture.
void set_request_priority(int priority) { priority_ = priority; }
int request_priority() const { return priority_; }
// After PrioritizedResource::PrioritizeTextures() is called, this returns
// if the the request succeeded and this texture can be acquired for use.
bool can_acquire_backing_texture() const { return is_above_priority_cutoff_; }
// This returns whether we still have a backing texture. This can continue
// to be true even after CanAcquireBackingTexture() becomes false. In this
// case the texture can be used but shouldn't be updated since it will get
// taken away "soon".
bool have_backing_texture() const { return !!backing(); }
bool BackingResourceWasEvicted() const;
// If CanAcquireBackingTexture() is true AcquireBackingTexture() will acquire
// a backing texture for use. Call this whenever the texture is actually
// needed.
void AcquireBackingTexture(ResourceProvider* resource_provider);
// TODO(epenner): Request late is really a hack for when we are totally out of
// memory (all textures are visible) but we can still squeeze into the limit
// by not painting occluded textures. In this case the manager refuses all
// visible textures and RequestLate() will enable CanAcquireBackingTexture()
// on a call-order basis. We might want to just remove this in the future
// (carefully) and just make sure we don't regress OOMs situations.
bool RequestLate();
// Update pixels of backing resource from image. This functions will aquire
// the backing if needed.
void SetPixels(ResourceProvider* resource_provider,
const uint8_t* image,
const gfx::Rect& image_rect,
const gfx::Rect& source_rect,
const gfx::Vector2d& dest_offset);
ResourceProvider::ResourceId resource_id() const {
return backing_ ? backing_->id() : 0;
}
// Self-managed textures are accounted for when prioritizing other textures,
// but they are not allocated/recycled/deleted, so this needs to be done
// externally. CanAcquireBackingTexture() indicates if the texture would have
// been allowed given its priority.
void set_is_self_managed(bool is_self_managed) {
is_self_managed_ = is_self_managed;
}
bool is_self_managed() { return is_self_managed_; }
void SetToSelfManagedMemoryPlaceholder(size_t bytes);
void ReturnBackingTexture();
private:
friend class PrioritizedResourceManager;
friend class PrioritizedResourceTest;
class Backing : public Resource {
public:
Backing(unsigned id,
ResourceProvider* resource_provider,
const gfx::Size& size,
ResourceFormat format);
~Backing();
void UpdatePriority();
void UpdateState(ResourceProvider* resource_provider);
PrioritizedResource* owner() { return owner_; }
bool CanBeRecycledIfNotInExternalUse() const;
int request_priority_at_last_priority_update() const {
return priority_at_last_priority_update_;
}
bool was_above_priority_cutoff_at_last_priority_update() const {
return was_above_priority_cutoff_at_last_priority_update_;
}
bool in_drawing_impl_tree() const { return in_drawing_impl_tree_; }
bool in_parent_compositor() const { return in_parent_compositor_; }
void DeleteResource(ResourceProvider* resource_provider);
bool ResourceHasBeenDeleted() const;
private:
const Proxy* proxy() const;
friend class PrioritizedResource;
friend class PrioritizedResourceManager;
PrioritizedResource* owner_;
int priority_at_last_priority_update_;
bool was_above_priority_cutoff_at_last_priority_update_;
// Set if this is currently-drawing impl tree.
bool in_drawing_impl_tree_;
// Set if this is in the parent compositor.
bool in_parent_compositor_;
bool resource_has_been_deleted_;
#if DCHECK_IS_ON
ResourceProvider* resource_provider_;
#endif
DISALLOW_COPY_AND_ASSIGN(Backing);
};
PrioritizedResource(PrioritizedResourceManager* resource_manager,
const gfx::Size& size,
ResourceFormat format);
bool is_above_priority_cutoff() { return is_above_priority_cutoff_; }
void set_above_priority_cutoff(bool is_above_priority_cutoff) {
is_above_priority_cutoff_ = is_above_priority_cutoff;
}
void set_manager_internal(PrioritizedResourceManager* manager) {
manager_ = manager;
}
Backing* backing() const { return backing_; }
void Link(Backing* backing);
void Unlink();
gfx::Size size_;
ResourceFormat format_;
size_t bytes_;
bool contents_swizzled_;
int priority_;
bool is_above_priority_cutoff_;
bool is_self_managed_;
Backing* backing_;
PrioritizedResourceManager* manager_;
DISALLOW_COPY_AND_ASSIGN(PrioritizedResource);
};
} // namespace cc
#endif // CC_RESOURCES_PRIORITIZED_RESOURCE_H_
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