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1 // Copyright 2012 The Chromium Authors. All rights reserved. | 1 // Copyright 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CC_RESOURCES_RESOURCE_H_ | 5 #ifndef CC_RESOURCES_RESOURCE_H_ |
6 #define CC_RESOURCES_RESOURCE_H_ | 6 #define CC_RESOURCES_RESOURCE_H_ |
7 | 7 |
8 #include "base/numerics/safe_math.h" | |
9 #include "cc/base/cc_export.h" | 8 #include "cc/base/cc_export.h" |
10 #include "cc/resources/resource_provider.h" | 9 #include "cc/resources/resource_provider.h" |
| 10 #include "cc/resources/resource_util.h" |
11 #include "ui/gfx/geometry/size.h" | 11 #include "ui/gfx/geometry/size.h" |
12 | 12 |
13 namespace cc { | 13 namespace cc { |
14 | 14 |
15 class CC_EXPORT Resource { | 15 class CC_EXPORT Resource { |
16 public: | 16 public: |
17 Resource() : id_(0), format_(RGBA_8888) {} | 17 Resource() : id_(0), format_(RGBA_8888) {} |
18 Resource(unsigned id, const gfx::Size& size, ResourceFormat format) | 18 Resource(unsigned id, const gfx::Size& size, ResourceFormat format) |
19 : id_(id), | 19 : id_(id), |
20 size_(size), | 20 size_(size), |
21 format_(format) {} | 21 format_(format) {} |
22 | 22 |
23 ResourceId id() const { return id_; } | 23 ResourceId id() const { return id_; } |
24 gfx::Size size() const { return size_; } | 24 gfx::Size size() const { return size_; } |
25 ResourceFormat format() const { return format_; } | 25 ResourceFormat format() const { return format_; } |
26 | 26 |
27 // Return true if the call to UncheckedMemorySizeBytes would return a value | |
28 // that fits in a size_t. | |
29 static bool VerifySizeInBytes(const gfx::Size& size, ResourceFormat format) { | |
30 base::CheckedNumeric<size_t> checked_value = BitsPerPixel(format); | |
31 checked_value *= size.width(); | |
32 checked_value *= size.height(); | |
33 if (!checked_value.IsValid()) | |
34 return false; | |
35 size_t value = checked_value.ValueOrDie(); | |
36 if ((value % 8) != 0) | |
37 return false; | |
38 return true; | |
39 } | |
40 | |
41 static size_t CheckedMemorySizeBytes(const gfx::Size& size, | |
42 ResourceFormat format) { | |
43 DCHECK(VerifySizeInBytes(size, format)); | |
44 base::CheckedNumeric<size_t> checked_value = BitsPerPixel(format); | |
45 checked_value *= size.width(); | |
46 checked_value *= size.height(); | |
47 checked_value /= 8; | |
48 return checked_value.ValueOrDie(); | |
49 } | |
50 | |
51 inline static size_t UncheckedMemorySizeBytes(const gfx::Size& size, | |
52 ResourceFormat format) { | |
53 DCHECK(VerifySizeInBytes(size, format)); | |
54 return static_cast<size_t>(BitsPerPixel(format)) * size.width() * | |
55 size.height() / 8; | |
56 } | |
57 | |
58 protected: | 27 protected: |
59 void set_id(ResourceId id) { id_ = id; } | 28 void set_id(ResourceId id) { id_ = id; } |
60 void set_dimensions(const gfx::Size& size, ResourceFormat format) { | 29 void set_dimensions(const gfx::Size& size, ResourceFormat format) { |
61 size_ = size; | 30 size_ = size; |
62 format_ = format; | 31 format_ = format; |
63 } | 32 } |
64 | 33 |
65 private: | 34 private: |
66 ResourceId id_; | 35 ResourceId id_; |
67 gfx::Size size_; | 36 gfx::Size size_; |
68 ResourceFormat format_; | 37 ResourceFormat format_; |
69 | 38 |
70 DISALLOW_COPY_AND_ASSIGN(Resource); | 39 DISALLOW_COPY_AND_ASSIGN(Resource); |
71 }; | 40 }; |
72 | 41 |
73 } // namespace cc | 42 } // namespace cc |
74 | 43 |
75 #endif // CC_RESOURCES_RESOURCE_H_ | 44 #endif // CC_RESOURCES_RESOURCE_H_ |
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