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| (Empty) |
| 1 #include "SkWriter32.h" | |
| 2 | |
| 3 struct SkWriter32::Block { | |
| 4 Block* fNext; | |
| 5 size_t fSize; | |
| 6 size_t fAllocated; | |
| 7 | |
| 8 size_t available() const { return fSize - fAllocated; } | |
| 9 char* base() { return (char*)(this + 1); } | |
| 10 const char* base() const { return (const char*)(this + 1); } | |
| 11 | |
| 12 uint32_t* alloc(size_t size) | |
| 13 { | |
| 14 SkASSERT(SkAlign4(size) == size); | |
| 15 SkASSERT(this->available() >= size); | |
| 16 void* ptr = this->base() + fAllocated; | |
| 17 fAllocated += size; | |
| 18 SkASSERT(fAllocated <= fSize); | |
| 19 return (uint32_t*)ptr; | |
| 20 } | |
| 21 | |
| 22 uint32_t* peek32(size_t offset) | |
| 23 { | |
| 24 SkASSERT(offset <= fAllocated + 4); | |
| 25 void* ptr = this->base() + offset; | |
| 26 return (uint32_t*)ptr; | |
| 27 } | |
| 28 | |
| 29 static Block* Create(size_t size) | |
| 30 { | |
| 31 SkASSERT(SkAlign4(size) == size); | |
| 32 Block* block = (Block*)sk_malloc_throw(sizeof(Block) + size); | |
| 33 block->fNext = NULL; | |
| 34 block->fSize = size; | |
| 35 block->fAllocated = 0; | |
| 36 return block; | |
| 37 } | |
| 38 }; | |
| 39 | |
| 40 static size_t compute_block_size(size_t currSize, size_t minSize) | |
| 41 { | |
| 42 if (currSize < minSize) | |
| 43 currSize = minSize; | |
| 44 | |
| 45 currSize += (currSize >> 1); | |
| 46 return SkAlign4(currSize); | |
| 47 } | |
| 48 | |
| 49 /////////////////////////////////////////////////////////////////////////////// | |
| 50 | |
| 51 SkWriter32::~SkWriter32() | |
| 52 { | |
| 53 this->reset(); | |
| 54 } | |
| 55 | |
| 56 void SkWriter32::reset() | |
| 57 { | |
| 58 Block* block = fHead; | |
| 59 while (block) | |
| 60 { | |
| 61 Block* next = block->fNext; | |
| 62 sk_free(block); | |
| 63 block = next; | |
| 64 } | |
| 65 fHead = fTail = NULL; | |
| 66 fSize = 0; | |
| 67 } | |
| 68 | |
| 69 uint32_t* SkWriter32::reserve(size_t size) | |
| 70 { | |
| 71 SkASSERT(SkAlign4(size) == size); | |
| 72 | |
| 73 Block* block = fTail; | |
| 74 | |
| 75 if (NULL == block) | |
| 76 { | |
| 77 SkASSERT(NULL == fHead); | |
| 78 fHead = fTail = block = Block::Create(SkMax32(size, fMinSize)); | |
| 79 } | |
| 80 else if (block->available() < size) | |
| 81 { | |
| 82 fTail = Block::Create(SkMax32(size, fMinSize)); | |
| 83 block->fNext = fTail; | |
| 84 block = fTail; | |
| 85 } | |
| 86 | |
| 87 fSize += size; | |
| 88 | |
| 89 return block->alloc(size); | |
| 90 } | |
| 91 | |
| 92 uint32_t* SkWriter32::peek32(size_t offset) | |
| 93 { | |
| 94 SkASSERT(SkAlign4(offset) == offset); | |
| 95 SkASSERT(offset <= fSize); | |
| 96 | |
| 97 Block* block = fHead; | |
| 98 SkASSERT(NULL != block); | |
| 99 | |
| 100 while (offset >= block->fAllocated) | |
| 101 { | |
| 102 offset -= block->fAllocated; | |
| 103 block = block->fNext; | |
| 104 SkASSERT(NULL != block); | |
| 105 } | |
| 106 return block->peek32(offset); | |
| 107 } | |
| 108 | |
| 109 void SkWriter32::flatten(void* dst) const | |
| 110 { | |
| 111 const Block* block = fHead; | |
| 112 SkDEBUGCODE(size_t total = 0;) | |
| 113 | |
| 114 while (block) | |
| 115 { | |
| 116 size_t allocated = block->fAllocated; | |
| 117 memcpy(dst, block->base(), allocated); | |
| 118 dst = (char*)dst + allocated; | |
| 119 block = block->fNext; | |
| 120 | |
| 121 SkDEBUGCODE(total += allocated;) | |
| 122 SkASSERT(total <= fSize); | |
| 123 } | |
| 124 SkASSERT(total == fSize); | |
| 125 } | |
| 126 | |
| 127 void SkWriter32::writePad(const void* src, size_t size) { | |
| 128 size_t alignedSize = SkAlign4(size); | |
| 129 char* dst = (char*)this->reserve(alignedSize); | |
| 130 memcpy(dst, src, size); | |
| 131 dst += size; | |
| 132 int n = alignedSize - size; | |
| 133 while (--n >= 0) { | |
| 134 *dst++ = 0; | |
| 135 } | |
| 136 } | |
| 137 | |
| 138 #include "SkStream.h" | |
| 139 | |
| 140 size_t SkWriter32::readFromStream(SkStream* stream, size_t length) { | |
| 141 char scratch[1024]; | |
| 142 const size_t MAX = sizeof(scratch); | |
| 143 size_t remaining = length; | |
| 144 | |
| 145 while (remaining != 0) { | |
| 146 size_t n = remaining; | |
| 147 if (n > MAX) { | |
| 148 n = MAX; | |
| 149 } | |
| 150 size_t bytes = stream->read(scratch, n); | |
| 151 this->writePad(scratch, bytes); | |
| 152 remaining -= bytes; | |
| 153 if (bytes != n) { | |
| 154 break; | |
| 155 } | |
| 156 } | |
| 157 return length - remaining; | |
| 158 } | |
| 159 | |
| 160 bool SkWriter32::writeToStream(SkWStream* stream) { | |
| 161 const Block* block = fHead; | |
| 162 while (block) { | |
| 163 if (!stream->write(block->base(), block->fAllocated)) { | |
| 164 return false; | |
| 165 } | |
| 166 block = block->fNext; | |
| 167 } | |
| 168 return true; | |
| 169 } | |
| 170 | |
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Chromium Code Reviews
Issue 113827:
Remove the remainder of the skia source code from the Chromium repo.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/