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comparison: gfx/skia/trunk/src/core/SkMask.cpp
gfx/skia/trunk/src/core/SkMask.cpp
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| -1:000000000000 | 0:46ef5cc9bbf4 |
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| 1 /* | |
| 2 * Copyright 2007 The Android Open Source Project | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #include "SkMask.h" | |
| 9 | |
| 10 /** returns the product if it is positive and fits in 31 bits. Otherwise this | |
| 11 returns 0. | |
| 12 */ | |
| 13 static int32_t safeMul32(int32_t a, int32_t b) { | |
| 14 int64_t size = sk_64_mul(a, b); | |
| 15 if (size > 0 && sk_64_isS32(size)) { | |
| 16 return sk_64_asS32(size); | |
| 17 } | |
| 18 return 0; | |
| 19 } | |
| 20 | |
| 21 size_t SkMask::computeImageSize() const { | |
| 22 return safeMul32(fBounds.height(), fRowBytes); | |
| 23 } | |
| 24 | |
| 25 size_t SkMask::computeTotalImageSize() const { | |
| 26 size_t size = this->computeImageSize(); | |
| 27 if (fFormat == SkMask::k3D_Format) { | |
| 28 size = safeMul32(SkToS32(size), 3); | |
| 29 } | |
| 30 return size; | |
| 31 } | |
| 32 | |
| 33 /** We explicitly use this allocator for SkBimap pixels, so that we can | |
| 34 freely assign memory allocated by one class to the other. | |
| 35 */ | |
| 36 uint8_t* SkMask::AllocImage(size_t size) { | |
| 37 return (uint8_t*)sk_malloc_throw(SkAlign4(size)); | |
| 38 } | |
| 39 | |
| 40 /** We explicitly use this allocator for SkBimap pixels, so that we can | |
| 41 freely assign memory allocated by one class to the other. | |
| 42 */ | |
| 43 void SkMask::FreeImage(void* image) { | |
| 44 sk_free(image); | |
| 45 } | |
| 46 | |
| 47 /////////////////////////////////////////////////////////////////////////////// | |
| 48 | |
| 49 static const int gMaskFormatToShift[] = { | |
| 50 ~0, // BW -- not supported | |
| 51 0, // A8 | |
| 52 0, // 3D | |
| 53 2, // ARGB32 | |
| 54 1, // LCD16 | |
| 55 2 // LCD32 | |
| 56 }; | |
| 57 | |
| 58 static int maskFormatToShift(SkMask::Format format) { | |
| 59 SkASSERT((unsigned)format < SK_ARRAY_COUNT(gMaskFormatToShift)); | |
| 60 SkASSERT(SkMask::kBW_Format != format); | |
| 61 return gMaskFormatToShift[format]; | |
| 62 } | |
| 63 | |
| 64 void* SkMask::getAddr(int x, int y) const { | |
| 65 SkASSERT(kBW_Format != fFormat); | |
| 66 SkASSERT(fBounds.contains(x, y)); | |
| 67 SkASSERT(fImage); | |
| 68 | |
| 69 char* addr = (char*)fImage; | |
| 70 addr += (y - fBounds.fTop) * fRowBytes; | |
| 71 addr += (x - fBounds.fLeft) << maskFormatToShift(fFormat); | |
| 72 return addr; | |
| 73 } |
