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 pixels()40 uint8* pixels() { return pixels_; } 41 memory()42 base::SharedMemory* memory() { return memory_; } 43 id()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