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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::CheckedMemorySizeBytes(const gfx::Size& size, |
| 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::UncheckedMemorySizeBytes(const gfx::Size& size, |
| 39 ResourceFormat format) { |
| 40 DCHECK(VerifySizeInBytes(size, format)); |
| 41 size_t bytes_per_row = |
| 42 size.width() * static_cast<size_t>(BitsPerPixel(format)) / 8; |
| 43 return size.height() * bytes_per_row; |
| 44 } |
| 45 |
| 46 // static |
| 47 size_t ResourceUtil::UncheckedMemorySizeBytesAligned(const gfx::Size& size, |
| 48 ResourceFormat format) { |
| 49 DCHECK(VerifySizeInBytes(size, format)); |
| 50 size_t bytes_per_row = |
| 51 size.width() * static_cast<size_t>(BitsPerPixel(format)) / 8; |
| 52 // Use 4-byte row alignment (OpenGL default) for upload performance. |
| 53 // Assuming that GL_UNPACK_ALIGNMENT has not changed from default. |
| 54 bytes_per_row = MathUtil::RoundUp<size_t>(bytes_per_row, 4u); |
| 55 return size.height() * bytes_per_row; |
| 56 } |
| 57 |
| 58 } // namespace cc |
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