gfx/skia/trunk/src/core/SkMask.cpp@6474c204b198 (annotated)
gfx/skia/trunk/src/core/SkMask.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright 2007 The Android Open Source Project |
| michael@0 | 3 | * |
| michael@0 | 4 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 5 | * found in the LICENSE file. |
| michael@0 | 6 | */ |
| michael@0 | 7 | |
| michael@0 | 8 | #include "SkMask.h" |
| michael@0 | 9 | |
| michael@0 | 10 | /** returns the product if it is positive and fits in 31 bits. Otherwise this |
| michael@0 | 11 | returns 0. |
| michael@0 | 12 | */ |
| michael@0 | 13 | static int32_t safeMul32(int32_t a, int32_t b) { |
| michael@0 | 14 | int64_t size = sk_64_mul(a, b); |
| michael@0 | 15 | if (size > 0 && sk_64_isS32(size)) { |
| michael@0 | 16 | return sk_64_asS32(size); |
| michael@0 | 17 | } |
| michael@0 | 18 | return 0; |
| michael@0 | 19 | } |
| michael@0 | 20 | |
| michael@0 | 21 | size_t SkMask::computeImageSize() const { |
| michael@0 | 22 | return safeMul32(fBounds.height(), fRowBytes); |
| michael@0 | 23 | } |
| michael@0 | 24 | |
| michael@0 | 25 | size_t SkMask::computeTotalImageSize() const { |
| michael@0 | 26 | size_t size = this->computeImageSize(); |
| michael@0 | 27 | if (fFormat == SkMask::k3D_Format) { |
| michael@0 | 28 | size = safeMul32(SkToS32(size), 3); |
| michael@0 | 29 | } |
| michael@0 | 30 | return size; |
| michael@0 | 31 | } |
| michael@0 | 32 | |
| michael@0 | 33 | /** We explicitly use this allocator for SkBimap pixels, so that we can |
| michael@0 | 34 | freely assign memory allocated by one class to the other. |
| michael@0 | 35 | */ |
| michael@0 | 36 | uint8_t* SkMask::AllocImage(size_t size) { |
| michael@0 | 37 | return (uint8_t*)sk_malloc_throw(SkAlign4(size)); |
| michael@0 | 38 | } |
| michael@0 | 39 | |
| michael@0 | 40 | /** We explicitly use this allocator for SkBimap pixels, so that we can |
| michael@0 | 41 | freely assign memory allocated by one class to the other. |
| michael@0 | 42 | */ |
| michael@0 | 43 | void SkMask::FreeImage(void* image) { |
| michael@0 | 44 | sk_free(image); |
| michael@0 | 45 | } |
| michael@0 | 46 | |
| michael@0 | 47 | /////////////////////////////////////////////////////////////////////////////// |
| michael@0 | 48 | |
| michael@0 | 49 | static const int gMaskFormatToShift[] = { |
| michael@0 | 50 | ~0, // BW -- not supported |
| michael@0 | 51 | 0, // A8 |
| michael@0 | 52 | 0, // 3D |
| michael@0 | 53 | 2, // ARGB32 |
| michael@0 | 54 | 1, // LCD16 |
| michael@0 | 55 | 2 // LCD32 |
| michael@0 | 56 | }; |
| michael@0 | 57 | |
| michael@0 | 58 | static int maskFormatToShift(SkMask::Format format) { |
| michael@0 | 59 | SkASSERT((unsigned)format < SK_ARRAY_COUNT(gMaskFormatToShift)); |
| michael@0 | 60 | SkASSERT(SkMask::kBW_Format != format); |
| michael@0 | 61 | return gMaskFormatToShift[format]; |
| michael@0 | 62 | } |
| michael@0 | 63 | |
| michael@0 | 64 | void* SkMask::getAddr(int x, int y) const { |
| michael@0 | 65 | SkASSERT(kBW_Format != fFormat); |
| michael@0 | 66 | SkASSERT(fBounds.contains(x, y)); |
| michael@0 | 67 | SkASSERT(fImage); |
| michael@0 | 68 | |
| michael@0 | 69 | char* addr = (char*)fImage; |
| michael@0 | 70 | addr += (y - fBounds.fTop) * fRowBytes; |
| michael@0 | 71 | addr += (x - fBounds.fLeft) << maskFormatToShift(fFormat); |
| michael@0 | 72 | return addr; |
| michael@0 | 73 | } |
