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1 /* | 1 /* |
2 * Copyright 2007 The Android Open Source Project | 2 * Copyright 2007 The Android Open Source Project |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "SkMask.h" | 8 #include "SkMask.h" |
9 | 9 |
10 /** returns the product if it is positive and fits in 31 bits. Otherwise this | 10 /** returns the product if it is positive and fits in 31 bits. Otherwise this |
11 returns 0. | 11 returns 0. |
12 */ | 12 */ |
13 static int32_t safeMul32(int32_t a, int32_t b) { | 13 static int32_t safeMul32(int32_t a, int32_t b) { |
14 int64_t size = sk_64_mul(a, b); | 14 int64_t size = sk_64_mul(a, b); |
15 if (size > 0 && sk_64_isS32(size)) { | 15 if (size > 0 && sk_64_isS32(size)) { |
16 return sk_64_asS32(size); | 16 return sk_64_asS32(size); |
17 } | 17 } |
18 return 0; | 18 return 0; |
19 } | 19 } |
20 | 20 |
21 size_t SkMask::computeImageSize() const { | 21 size_t SkMask::computeImageSize() const { |
22 return safeMul32(fBounds.height(), fRowBytes); | 22 return safeMul32(fBounds.height(), fRowBytes); |
23 } | 23 } |
24 | 24 |
25 size_t SkMask::computeTotalImageSize() const { | 25 size_t SkMask::computeTotalImageSize() const { |
26 size_t size = this->computeImageSize(); | 26 size_t size = this->computeImageSize(); |
27 if (fFormat == SkMask::k3D_Format) { | 27 if (fFormat == SkMask::k3D_Format) { |
28 size = safeMul32(size, 3); | 28 size = safeMul32(SkToS32(size), 3); |
29 } | 29 } |
30 return size; | 30 return size; |
31 } | 31 } |
32 | 32 |
33 /** We explicitly use this allocator for SkBimap pixels, so that we can | 33 /** We explicitly use this allocator for SkBimap pixels, so that we can |
34 freely assign memory allocated by one class to the other. | 34 freely assign memory allocated by one class to the other. |
35 */ | 35 */ |
36 uint8_t* SkMask::AllocImage(size_t size) { | 36 uint8_t* SkMask::AllocImage(size_t size) { |
37 return (uint8_t*)sk_malloc_throw(SkAlign4(size)); | 37 return (uint8_t*)sk_malloc_throw(SkAlign4(size)); |
38 } | 38 } |
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64 void* SkMask::getAddr(int x, int y) const { | 64 void* SkMask::getAddr(int x, int y) const { |
65 SkASSERT(kBW_Format != fFormat); | 65 SkASSERT(kBW_Format != fFormat); |
66 SkASSERT(fBounds.contains(x, y)); | 66 SkASSERT(fBounds.contains(x, y)); |
67 SkASSERT(fImage); | 67 SkASSERT(fImage); |
68 | 68 |
69 char* addr = (char*)fImage; | 69 char* addr = (char*)fImage; |
70 addr += (y - fBounds.fTop) * fRowBytes; | 70 addr += (y - fBounds.fTop) * fRowBytes; |
71 addr += (x - fBounds.fLeft) << maskFormatToShift(fFormat); | 71 addr += (x - fBounds.fLeft) << maskFormatToShift(fFormat); |
72 return addr; | 72 return addr; |
73 } | 73 } |
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