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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CC_RESOURCES_SHARED_BITMAP_H_
      6 #define CC_RESOURCES_SHARED_BITMAP_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/callback.h"
     10 #include "base/memory/shared_memory.h"
     11 #include "cc/base/cc_export.h"
     12 #include "gpu/command_buffer/common/mailbox.h"
     13 #include "ui/gfx/size.h"
     14 
     15 namespace base { class SharedMemory; }
     16 
     17 namespace cc {
     18 typedef gpu::Mailbox SharedBitmapId;
     19 
     20 class CC_EXPORT SharedBitmap {
     21  public:
     22   SharedBitmap(base::SharedMemory* memory,
     23                const SharedBitmapId& id,
     24                const base::Callback<void(SharedBitmap* bitmap)>& free_callback);
     25 
     26   SharedBitmap(uint8* pixels,
     27                const SharedBitmapId& id,
     28                const base::Callback<void(SharedBitmap* bitmap)>& free_callback);
     29 
     30   ~SharedBitmap();
     31 
     32   bool operator<(const SharedBitmap& right) const {
     33     if (memory_ < right.memory_)
     34       return true;
     35     if (memory_ > right.memory_)
     36       return false;
     37     return id_ < right.id_;
     38   }
     39 
     40   uint8* pixels() { return pixels_; }
     41 
     42   base::SharedMemory* memory() { return memory_; }
     43 
     44   SharedBitmapId id() { return id_; }
     45 
     46   // Returns true if the size is valid and false otherwise.
     47   static bool SizeInBytes(const gfx::Size& size, size_t* size_in_bytes);
     48   // Dies with a CRASH() if the size can not be represented as a positive number
     49   // of bytes.
     50   static size_t CheckedSizeInBytes(const gfx::Size& size);
     51   // Returns the size in bytes but may overflow or return 0. Only do this for
     52   // sizes that have already been checked.
     53   static size_t UncheckedSizeInBytes(const gfx::Size& size);
     54   // Returns true if the size is valid and false otherwise.
     55   static bool VerifySizeInBytes(const gfx::Size& size);
     56 
     57   static SharedBitmapId GenerateId();
     58 
     59  private:
     60   base::SharedMemory* memory_;
     61   uint8* pixels_;
     62   SharedBitmapId id_;
     63   base::Callback<void(SharedBitmap* bitmap)> free_callback_;
     64 
     65   DISALLOW_COPY_AND_ASSIGN(SharedBitmap);
     66 };
     67 
     68 }  // namespace cc
     69 
     70 #endif  // CC_RESOURCES_SHARED_BITMAP_H_
     71