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