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/trace_event/memory_allocator_dump.h"
  10 #include "cc/base/cc_export.h"
  11 #include "gpu/command_buffer/common/mailbox.h"
  12 #include "ui/gfx/geometry/size.h"
  13
  14 namespace cc {
  15 typedef gpu::Mailbox SharedBitmapId;
  16
  17 CC_EXPORT base::trace_event::MemoryAllocatorDumpGuid
  18 GetSharedBitmapGUIDForTracing(const SharedBitmapId& bitmap_id);
  19
  20 class CC_EXPORT SharedBitmap {
  21  public:
  22   SharedBitmap(uint8* pixels, const SharedBitmapId& id);
  23
  24   virtual ~SharedBitmap();
  25
  26   uint8* pixels() { return pixels_; }
  27
  28   const SharedBitmapId& id() { return id_; }
  29
  30   // Returns true if the size is valid and false otherwise.
  31   static bool SizeInBytes(const gfx::Size& size, size_t* size_in_bytes);
  32   // Dies with a CRASH() if the size can not be represented as a positive number
  33   // of bytes.
  34   static size_t CheckedSizeInBytes(const gfx::Size& size);
  35   // Returns the size in bytes but may overflow or return 0. Only do this for
  36   // sizes that have already been checked.
  37   static size_t UncheckedSizeInBytes(const gfx::Size& size);
  38   // Returns true if the size is valid and false otherwise.
  39   static bool VerifySizeInBytes(const gfx::Size& size);
  40
  41   static SharedBitmapId GenerateId();
  42
  43  private:
  44   uint8* pixels_;
  45   SharedBitmapId id_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(SharedBitmap);
  48 };
  49
  50 }  // namespace cc
  51
  52 #endif  // CC_RESOURCES_SHARED_BITMAP_H_