| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "cc/resources/shared_bitmap.h" |
| |
| #include "base/logging.h" |
| #include "base/numerics/safe_math.h" |
| #include "base/rand_util.h" |
| |
| namespace cc { |
| |
| SharedBitmap::SharedBitmap( |
| base::SharedMemory* memory, |
| const SharedBitmapId& id, |
| const base::Callback<void(SharedBitmap* bitmap)>& free_callback) |
| : memory_(memory), |
| pixels_(static_cast<uint8*>(memory_->memory())), |
| id_(id), |
| free_callback_(free_callback) { |
| } |
| |
| SharedBitmap::SharedBitmap( |
| uint8* pixels, |
| const SharedBitmapId& id, |
| const base::Callback<void(SharedBitmap* bitmap)>& free_callback) |
| : memory_(NULL), pixels_(pixels), id_(id), free_callback_(free_callback) { |
| } |
| |
| SharedBitmap::~SharedBitmap() { free_callback_.Run(this); } |
| |
| // static |
| bool SharedBitmap::SizeInBytes(const gfx::Size& size, size_t* size_in_bytes) { |
| if (size.IsEmpty()) |
| return false; |
| base::CheckedNumeric<size_t> s = 4; |
| s *= size.width(); |
| s *= size.height(); |
| if (!s.IsValid()) |
| return false; |
| *size_in_bytes = s.ValueOrDie(); |
| return true; |
| } |
| |
| // static |
| size_t SharedBitmap::CheckedSizeInBytes(const gfx::Size& size) { |
| CHECK(!size.IsEmpty()); |
| base::CheckedNumeric<size_t> s = 4; |
| s *= size.width(); |
| s *= size.height(); |
| return s.ValueOrDie(); |
| } |
| |
| // static |
| size_t SharedBitmap::UncheckedSizeInBytes(const gfx::Size& size) { |
| DCHECK(VerifySizeInBytes(size)); |
| size_t s = 4; |
| s *= size.width(); |
| s *= size.height(); |
| return s; |
| } |
| |
| // static |
| bool SharedBitmap::VerifySizeInBytes(const gfx::Size& size) { |
| if (size.IsEmpty()) |
| return false; |
| base::CheckedNumeric<size_t> s = 4; |
| s *= size.width(); |
| s *= size.height(); |
| return s.IsValid(); |
| } |
| |
| // static |
| SharedBitmapId SharedBitmap::GenerateId() { |
| SharedBitmapId id; |
| // Needs cryptographically-secure random numbers. |
| base::RandBytes(id.name, sizeof(id.name)); |
| return id; |
| } |
| |
| } // namespace cc |