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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 #include "cc/resources/shared_bitmap.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "base/numerics/safe_math.h" | |
9 #include "base/rand_util.h" | |
10 | |
11 namespace cc { | |
12 | |
13 SharedBitmap::SharedBitmap(uint8* pixels, const SharedBitmapId& id) | |
14 : pixels_(pixels), id_(id) { | |
15 } | |
16 | |
17 SharedBitmap::~SharedBitmap() { | |
18 } | |
19 | |
20 // static | |
21 bool SharedBitmap::SizeInBytes(const gfx::Size& size, size_t* size_in_bytes) { | |
22 if (size.IsEmpty()) | |
23 return false; | |
24 base::CheckedNumeric<size_t> s = 4; | |
25 s *= size.width(); | |
26 s *= size.height(); | |
27 if (!s.IsValid()) | |
28 return false; | |
29 *size_in_bytes = s.ValueOrDie(); | |
30 return true; | |
31 } | |
32 | |
33 // static | |
34 size_t SharedBitmap::CheckedSizeInBytes(const gfx::Size& size) { | |
35 CHECK(!size.IsEmpty()); | |
36 base::CheckedNumeric<size_t> s = 4; | |
37 s *= size.width(); | |
38 s *= size.height(); | |
39 return s.ValueOrDie(); | |
40 } | |
41 | |
42 // static | |
43 size_t SharedBitmap::UncheckedSizeInBytes(const gfx::Size& size) { | |
44 DCHECK(VerifySizeInBytes(size)); | |
45 size_t s = 4; | |
46 s *= size.width(); | |
47 s *= size.height(); | |
48 return s; | |
49 } | |
50 | |
51 // static | |
52 bool SharedBitmap::VerifySizeInBytes(const gfx::Size& size) { | |
53 if (size.IsEmpty()) | |
54 return false; | |
55 base::CheckedNumeric<size_t> s = 4; | |
56 s *= size.width(); | |
57 s *= size.height(); | |
58 return s.IsValid(); | |
59 } | |
60 | |
61 // static | |
62 SharedBitmapId SharedBitmap::GenerateId() { | |
63 SharedBitmapId id; | |
64 // Needs cryptographically-secure random numbers. | |
65 base::RandBytes(id.name, sizeof(id.name)); | |
66 return id; | |
67 } | |
68 | |
69 } // namespace cc | |
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