cc/resources/shared_bitmap.h

   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_