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1 // Copyright 2015 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/resource_util.h" | |
6 | |
7 #include "base/numerics/safe_math.h" | |
8 #include "cc/base/math_util.h" | |
9 | |
10 namespace cc { | |
11 | |
12 // static | |
13 bool ResourceUtil::VerifySizeInBytes(const gfx::Size& size, | |
14 ResourceFormat format) { | |
15 base::CheckedNumeric<size_t> checked_value = BitsPerPixel(format); | |
16 checked_value *= size.width(); | |
17 checked_value *= size.height(); | |
18 if (!checked_value.IsValid()) | |
19 return false; | |
20 size_t value = checked_value.ValueOrDie(); | |
21 if ((value % 8) != 0) | |
22 return false; | |
23 return true; | |
24 } | |
25 | |
26 // static | |
27 size_t ResourceUtil::CheckedSizeInBytes(const gfx::Size& size, | |
vmpstr
2015/07/14 17:44:15
I'd weakly prefer SizeInBytes to be the checked ve
prashant.n
2015/07/15 07:03:31
You mean to say - instead of SizeInBytes, use Unch
vmpstr
2015/07/15 17:43:22
Yeah, just a function rename. If it's just Foo it
| |
28 ResourceFormat format) { | |
29 DCHECK(VerifySizeInBytes(size, format)); | |
30 base::CheckedNumeric<size_t> checked_value = BitsPerPixel(format); | |
31 checked_value *= size.width(); | |
32 checked_value *= size.height(); | |
33 checked_value /= 8; | |
34 return checked_value.ValueOrDie(); | |
35 } | |
36 | |
37 // static | |
38 size_t ResourceUtil::WidthInBytes(size_t width, ResourceFormat format) { | |
39 size_t bytes_per_row = width * static_cast<size_t>(BitsPerPixel(format)) / 8; | |
40 return bytes_per_row; | |
41 } | |
42 | |
43 // static | |
44 size_t ResourceUtil::SizeInBytes(const gfx::Size& size, ResourceFormat format) { | |
45 DCHECK(VerifySizeInBytes(size, format)); | |
46 return size.height() * WidthInBytes(size.width(), format); | |
47 } | |
48 | |
49 // static | |
50 size_t ResourceUtil::WidthInBytesAligned(size_t width, ResourceFormat format) { | |
51 // Use 4-byte row alignment (OpenGL default) for upload performance. | |
52 // Assuming that GL_UNPACK_ALIGNMENT has not changed from default. | |
53 return MathUtil::RoundUp<size_t>(WidthInBytes(width, format), 4u); | |
54 } | |
55 | |
56 // static | |
57 size_t ResourceUtil::SizeInBytesAligned(const gfx::Size& size, | |
58 ResourceFormat format) { | |
59 DCHECK(VerifySizeInBytes(size, format)); | |
60 return size.height() * WidthInBytesAligned(size.width(), format); | |
61 } | |
62 | |
63 } // namespace cc | |
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