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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 CCPrioritizedTexture_h
#define CCPrioritizedTexture_h
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "cc/priority_calculator.h"
#include "cc/resource_provider.h"
#include "cc/texture.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/size.h"
#include "ui/gfx/vector2d.h"
#include "third_party/khronos/GLES2/gl2.h"
namespace cc {
class PrioritizedTextureManager;
class PrioritizedTexture {
public:
static scoped_ptr<PrioritizedTexture> create(PrioritizedTextureManager* manager, gfx::Size size, GLenum format)
{
return make_scoped_ptr(new PrioritizedTexture(manager, size, format));
}
static scoped_ptr<PrioritizedTexture> create(PrioritizedTextureManager* manager)
{
return make_scoped_ptr(new PrioritizedTexture(manager, gfx::Size(), 0));
}
~PrioritizedTexture();
// Texture properties. Changing these causes the backing texture to be lost.
// Setting these to the same value is a no-op.
void setTextureManager(PrioritizedTextureManager*);
PrioritizedTextureManager* textureManager() { return m_manager; }
void setDimensions(gfx::Size, GLenum format);
GLenum format() const { return m_format; }
gfx::Size size() const { return m_size; }
size_t bytes() const { return m_bytes; }
bool contentsSwizzled() const { return m_contentsSwizzled; }
// Set priority for the requested texture.
void setRequestPriority(int priority) { m_priority = priority; }
int requestPriority() const { return m_priority; }
// After PrioritizedTexture::prioritizeTextures() is called, this returns
// if the the request succeeded and this texture can be acquired for use.
bool canAcquireBackingTexture() const { return m_isAbovePriorityCutoff; }
// 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 haveBackingTexture() 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*);
// FIXME: 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*, const uint8_t* image, const gfx::Rect& imageRect, const gfx::Rect& sourceRect, const gfx::Vector2d& destOffset);
ResourceProvider::ResourceId resourceId() const;
// 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 setIsSelfManaged(bool isSelfManaged) { m_isSelfManaged = isSelfManaged; }
bool isSelfManaged() { return m_isSelfManaged; }
void setToSelfManagedMemoryPlaceholder(size_t bytes);
void returnBackingTexture();
private:
friend class PrioritizedTextureManager;
friend class PrioritizedTextureTest;
class Backing : public Texture {
public:
Backing(unsigned id, ResourceProvider*, gfx::Size, GLenum format);
~Backing();
void updatePriority();
void updateInDrawingImplTree();
PrioritizedTexture* owner() { return m_owner; }
bool canBeRecycled() const;
int requestPriorityAtLastPriorityUpdate() const { return m_priorityAtLastPriorityUpdate; }
bool wasAbovePriorityCutoffAtLastPriorityUpdate() const { return m_wasAbovePriorityCutoffAtLastPriorityUpdate; }
bool inDrawingImplTree() const { return m_inDrawingImplTree; }
void deleteResource(ResourceProvider*);
bool resourceHasBeenDeleted() const;
private:
friend class PrioritizedTexture;
PrioritizedTexture* m_owner;
int m_priorityAtLastPriorityUpdate;
bool m_wasAbovePriorityCutoffAtLastPriorityUpdate;
// Set if this is currently-drawing impl tree.
bool m_inDrawingImplTree;
bool m_resourceHasBeenDeleted;
#ifndef NDEBUG
ResourceProvider* m_resourceProvider;
#endif
DISALLOW_COPY_AND_ASSIGN(Backing);
};
PrioritizedTexture(PrioritizedTextureManager*, gfx::Size, GLenum format);
bool isAbovePriorityCutoff() { return m_isAbovePriorityCutoff; }
void setAbovePriorityCutoff(bool isAbovePriorityCutoff) { m_isAbovePriorityCutoff = isAbovePriorityCutoff; }
void setManagerInternal(PrioritizedTextureManager* manager) { m_manager = manager; }
Backing* backing() const { return m_backing; }
void link(Backing*);
void unlink();
gfx::Size m_size;
GLenum m_format;
size_t m_bytes;
bool m_contentsSwizzled;
int m_priority;
bool m_isAbovePriorityCutoff;
bool m_isSelfManaged;
Backing* m_backing;
PrioritizedTextureManager* m_manager;
DISALLOW_COPY_AND_ASSIGN(PrioritizedTexture);
};
} // namespace cc
#endif
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