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116 lines
3.4 KiB
C++
116 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_GFX_TEXTURECLIENTPOOL_H
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#define MOZILLA_GFX_TEXTURECLIENTPOOL_H
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#include "mozilla/gfx/Types.h"
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#include "mozilla/gfx/Point.h"
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#include "mozilla/RefPtr.h"
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#include "TextureClient.h"
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#include "nsITimer.h"
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#include <stack>
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namespace mozilla {
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namespace layers {
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class ISurfaceAllocator;
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class TextureClientPool MOZ_FINAL
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{
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~TextureClientPool();
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public:
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NS_INLINE_DECL_REFCOUNTING(TextureClientPool)
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TextureClientPool(gfx::SurfaceFormat aFormat, gfx::IntSize aSize,
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ISurfaceAllocator *aAllocator);
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/**
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* Gets an allocated TextureClient of size and format that are determined
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* by the initialisation parameters given to the pool. This will either be
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* a cached client that was returned to the pool, or a newly allocated
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* client if one isn't available.
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*
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* All clients retrieved by this method should be returned using the return
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* functions, or reported lost so that the pool can manage its size correctly.
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*/
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TemporaryRef<TextureClient> GetTextureClient();
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/**
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* Return a TextureClient that is no longer being used and is ready for
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* immediate re-use or destruction.
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*/
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void ReturnTextureClient(TextureClient *aClient);
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/**
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* Return a TextureClient that is not yet ready to be reused, but will be
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* imminently.
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*/
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void ReturnTextureClientDeferred(TextureClient *aClient);
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/**
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* Attempt to shrink the pool so that there are no more than
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* sMaxTextureClients clients outstanding.
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*/
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void ShrinkToMaximumSize();
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/**
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* Attempt to shrink the pool so that there are no more than sMinCacheSize
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* unused clients.
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*/
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void ShrinkToMinimumSize();
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/**
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* Return any clients to the pool that were previously returned in
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* ReturnTextureClientDeferred.
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*/
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void ReturnDeferredClients();
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/**
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* Report that a client retrieved via GetTextureClient() has become
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* unusable, so that it will no longer be tracked.
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*/
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void ReportClientLost() { mOutstandingClients--; }
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/**
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* Calling this will cause the pool to attempt to relinquish any unused
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* clients.
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*/
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void Clear();
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gfx::SurfaceFormat GetFormat() { return mFormat; }
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private:
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// The time in milliseconds before the pool will be shrunk to the minimum
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// size after returning a client.
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static const uint32_t sShrinkTimeout = 1000;
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// The minimum size of the pool (the number of tiles that will be kept after
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// shrinking).
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static const uint32_t sMinCacheSize = 0;
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// The maximum number of texture clients managed by this pool that we want
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// to remain active.
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static const uint32_t sMaxTextureClients = 50;
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gfx::SurfaceFormat mFormat;
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gfx::IntSize mSize;
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uint32_t mOutstandingClients;
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// On b2g gonk, std::queue might be a better choice.
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// On ICS, fence wait happens implicitly before drawing.
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// Since JB, fence wait happens explicitly when fetching a client from the pool.
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std::stack<RefPtr<TextureClient> > mTextureClients;
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std::stack<RefPtr<TextureClient> > mTextureClientsDeferred;
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nsRefPtr<nsITimer> mTimer;
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RefPtr<ISurfaceAllocator> mSurfaceAllocator;
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};
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}
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}
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#endif /* MOZILLA_GFX_TEXTURECLIENTPOOL_H */
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