SkWriter32.h revision f6100c8b1aba89027cf74da8a324a744fd1d53fa
1ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com 28a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com/* 3ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com * Copyright 2008 The Android Open Source Project 48a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com * 5ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com * Use of this source code is governed by a BSD-style license that can be 6ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com * found in the LICENSE file. 78a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com */ 88a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 9ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976eepoger@google.com 108a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#ifndef SkWriter32_DEFINED 118a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#define SkWriter32_DEFINED 128a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 138a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkTypes.h" 148a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 158a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkScalar.h" 1694e75ee46a569cbcdf61fb7f04ee3a69d3ca0896djsollen@google.com#include "SkPath.h" 178a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkPoint.h" 188a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#include "SkRect.h" 194ed0fb768409bf97b79899c3990d8c15f5e9d784reed@google.com#include "SkRRect.h" 202b2ede3e713065e1bac461787b0aafb03eaf871fdjsollen@google.com#include "SkMatrix.h" 212b2ede3e713065e1bac461787b0aafb03eaf871fdjsollen@google.com#include "SkRegion.h" 228a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 238a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comclass SkStream; 248a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comclass SkWStream; 258a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 268a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comclass SkWriter32 : SkNoncopyable { 275595af1b2ebe6590e98641464d43d22281a7f295reed@google.com struct BlockHeader; 288a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.compublic: 29e49aca968ca27d90ca919a972a86839ecaf1224areed@google.com /** 30e49aca968ca27d90ca919a972a86839ecaf1224areed@google.com * The caller can specify an initial block of storage, which the caller manages. 31e49aca968ca27d90ca919a972a86839ecaf1224areed@google.com * SkWriter32 will not attempt to free this in its destructor. It is up to the 32e49aca968ca27d90ca919a972a86839ecaf1224areed@google.com * implementation to decide if, and how much, of the storage to utilize, and it 33e49aca968ca27d90ca919a972a86839ecaf1224areed@google.com * is possible that it may be ignored entirely. 34e49aca968ca27d90ca919a972a86839ecaf1224areed@google.com */ 35e49aca968ca27d90ca919a972a86839ecaf1224areed@google.com SkWriter32(size_t minSize, void* initialStorage, size_t storageSize); 36e49aca968ca27d90ca919a972a86839ecaf1224areed@google.com 37e1bc274295ec57cb3d3f01aaa8abff3b49c76c73vandebo@chromium.org SkWriter32(size_t minSize) 38f6100c8b1aba89027cf74da8a324a744fd1d53famike@reedtribe.org : fHead(NULL) 39f6100c8b1aba89027cf74da8a324a744fd1d53famike@reedtribe.org , fTail(NULL) 40f6100c8b1aba89027cf74da8a324a744fd1d53famike@reedtribe.org , fMinSize(minSize) 41f6100c8b1aba89027cf74da8a324a744fd1d53famike@reedtribe.org , fSize(0) 42f6100c8b1aba89027cf74da8a324a744fd1d53famike@reedtribe.org , fWrittenBeforeLastBlock(0) 43f6100c8b1aba89027cf74da8a324a744fd1d53famike@reedtribe.org {} 44e49aca968ca27d90ca919a972a86839ecaf1224areed@google.com 458a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com ~SkWriter32(); 468a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 471cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com // return the current offset (will always be a multiple of 4) 481cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com uint32_t bytesWritten() const { return fSize; } 491cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com // DEPRECATED: use byetsWritten instead 501cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com uint32_t size() const { return this->bytesWritten(); } 511cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com 521cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com void reset(); 53b89a03c890668f98d9f8b269b6ad00824409435bskia.committer@gmail.com 545595af1b2ebe6590e98641464d43d22281a7f295reed@google.com // size MUST be multiple of 4 555595af1b2ebe6590e98641464d43d22281a7f295reed@google.com uint32_t* reserve(size_t size) { 565595af1b2ebe6590e98641464d43d22281a7f295reed@google.com SkASSERT(SkAlign4(size) == size); 57b89a03c890668f98d9f8b269b6ad00824409435bskia.committer@gmail.com 585595af1b2ebe6590e98641464d43d22281a7f295reed@google.com Block* block = fTail; 595595af1b2ebe6590e98641464d43d22281a7f295reed@google.com if (NULL == block || block->available() < size) { 605595af1b2ebe6590e98641464d43d22281a7f295reed@google.com block = this->doReserve(size); 615595af1b2ebe6590e98641464d43d22281a7f295reed@google.com } 625595af1b2ebe6590e98641464d43d22281a7f295reed@google.com fSize += size; 635595af1b2ebe6590e98641464d43d22281a7f295reed@google.com return block->alloc(size); 645595af1b2ebe6590e98641464d43d22281a7f295reed@google.com } 65a27096b4740775ae141fd0abaf456d706065c5eeskia.committer@gmail.com 665595af1b2ebe6590e98641464d43d22281a7f295reed@google.com void reset(void* storage, size_t size); 67e49aca968ca27d90ca919a972a86839ecaf1224areed@google.com 688a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com bool writeBool(bool value) { 698a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com this->writeInt(value); 708a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com return value; 718a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 72fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 738a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com void writeInt(int32_t value) { 748a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com *(int32_t*)this->reserve(sizeof(value)) = value; 758a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 76fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 778a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com void write8(int32_t value) { 788a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com *(int32_t*)this->reserve(sizeof(value)) = value & 0xFF; 798a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 80fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 818a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com void write16(int32_t value) { 828a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com *(int32_t*)this->reserve(sizeof(value)) = value & 0xFFFF; 838a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 84fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 858a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com void write32(int32_t value) { 868a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com *(int32_t*)this->reserve(sizeof(value)) = value; 878a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 88fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 8951c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com void writePtr(void* ptr) { 9051c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com // Since we "know" that we're always 4-byte aligned, we can tell the 9151c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com // compiler that here, by assigning to an int32 ptr. 9251c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com int32_t* addr = (int32_t*)this->reserve(sizeof(void*)); 9351c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com if (4 == sizeof(void*)) { 9451c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com *(void**)addr = ptr; 9551c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com } else { 9651c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com memcpy(addr, &ptr, sizeof(void*)); 9751c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com } 9851c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com } 9951c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com 1008a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com void writeScalar(SkScalar value) { 1018a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com *(SkScalar*)this->reserve(sizeof(value)) = value; 1028a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 103fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 1048a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com void writePoint(const SkPoint& pt) { 1058a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com *(SkPoint*)this->reserve(sizeof(pt)) = pt; 1068a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 107fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 1088a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com void writeRect(const SkRect& rect) { 1098a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com *(SkRect*)this->reserve(sizeof(rect)) = rect; 1108a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 111306ab9d5de38f2a547fd1d69aedbe69b5c6617ccskia.committer@gmail.com 1124ed0fb768409bf97b79899c3990d8c15f5e9d784reed@google.com void writeRRect(const SkRRect& rrect) { 1134ed0fb768409bf97b79899c3990d8c15f5e9d784reed@google.com rrect.writeToMemory(this->reserve(SkRRect::kSizeInMemory)); 1144ed0fb768409bf97b79899c3990d8c15f5e9d784reed@google.com } 115306ab9d5de38f2a547fd1d69aedbe69b5c6617ccskia.committer@gmail.com 11694e75ee46a569cbcdf61fb7f04ee3a69d3ca0896djsollen@google.com void writePath(const SkPath& path) { 11794e75ee46a569cbcdf61fb7f04ee3a69d3ca0896djsollen@google.com size_t size = path.writeToMemory(NULL); 11894e75ee46a569cbcdf61fb7f04ee3a69d3ca0896djsollen@google.com SkASSERT(SkAlign4(size) == size); 11994e75ee46a569cbcdf61fb7f04ee3a69d3ca0896djsollen@google.com path.writeToMemory(this->reserve(size)); 12094e75ee46a569cbcdf61fb7f04ee3a69d3ca0896djsollen@google.com } 12194e75ee46a569cbcdf61fb7f04ee3a69d3ca0896djsollen@google.com 1222b2ede3e713065e1bac461787b0aafb03eaf871fdjsollen@google.com void writeMatrix(const SkMatrix& matrix) { 12394e75ee46a569cbcdf61fb7f04ee3a69d3ca0896djsollen@google.com size_t size = matrix.writeToMemory(NULL); 1242b2ede3e713065e1bac461787b0aafb03eaf871fdjsollen@google.com SkASSERT(SkAlign4(size) == size); 12594e75ee46a569cbcdf61fb7f04ee3a69d3ca0896djsollen@google.com matrix.writeToMemory(this->reserve(size)); 1262b2ede3e713065e1bac461787b0aafb03eaf871fdjsollen@google.com } 127fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 1282b2ede3e713065e1bac461787b0aafb03eaf871fdjsollen@google.com void writeRegion(const SkRegion& rgn) { 12994e75ee46a569cbcdf61fb7f04ee3a69d3ca0896djsollen@google.com size_t size = rgn.writeToMemory(NULL); 1302b2ede3e713065e1bac461787b0aafb03eaf871fdjsollen@google.com SkASSERT(SkAlign4(size) == size); 13194e75ee46a569cbcdf61fb7f04ee3a69d3ca0896djsollen@google.com rgn.writeToMemory(this->reserve(size)); 1322b2ede3e713065e1bac461787b0aafb03eaf871fdjsollen@google.com } 1332b2ede3e713065e1bac461787b0aafb03eaf871fdjsollen@google.com 1348a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // write count bytes (must be a multiple of 4) 1358a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com void writeMul4(const void* values, size_t size) { 1365b3d5349bedf37ec6fcf03bac04cf33129fc176areed@google.com this->write(values, size); 1375b3d5349bedf37ec6fcf03bac04cf33129fc176areed@google.com } 1385b3d5349bedf37ec6fcf03bac04cf33129fc176areed@google.com 1395b3d5349bedf37ec6fcf03bac04cf33129fc176areed@google.com /** 1405b3d5349bedf37ec6fcf03bac04cf33129fc176areed@google.com * Write size bytes from values. size must be a multiple of 4, though 1415b3d5349bedf37ec6fcf03bac04cf33129fc176areed@google.com * values need not be 4-byte aligned. 1425b3d5349bedf37ec6fcf03bac04cf33129fc176areed@google.com */ 1435b3d5349bedf37ec6fcf03bac04cf33129fc176areed@google.com void write(const void* values, size_t size) { 1448a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com SkASSERT(SkAlign4(size) == size); 1458a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // if we could query how much is avail in the current block, we might 1468a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // copy that much, and then alloc the rest. That would reduce the waste 1478a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // in the current block 1488a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com memcpy(this->reserve(size), values, size); 1498a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com } 150fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 1515a7c6be72b940dde8ff6ad2485a09aecd56a2660scroggo@google.com /** 1525a7c6be72b940dde8ff6ad2485a09aecd56a2660scroggo@google.com * Reserve size bytes. Does not need to be 4 byte aligned. The remaining space (if any) will be 1535a7c6be72b940dde8ff6ad2485a09aecd56a2660scroggo@google.com * filled in with zeroes. 1545a7c6be72b940dde8ff6ad2485a09aecd56a2660scroggo@google.com */ 1555a7c6be72b940dde8ff6ad2485a09aecd56a2660scroggo@google.com uint32_t* reservePad(size_t size); 1565a7c6be72b940dde8ff6ad2485a09aecd56a2660scroggo@google.com 1575a7c6be72b940dde8ff6ad2485a09aecd56a2660scroggo@google.com /** 1585a7c6be72b940dde8ff6ad2485a09aecd56a2660scroggo@google.com * Write size bytes from src, and pad to 4 byte alignment with zeroes. 1595a7c6be72b940dde8ff6ad2485a09aecd56a2660scroggo@google.com */ 1608a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com void writePad(const void* src, size_t size); 161dde0956375e87027df2fdd80d430dd819c217aacreed@google.com 162dde0956375e87027df2fdd80d430dd819c217aacreed@google.com /** 163dde0956375e87027df2fdd80d430dd819c217aacreed@google.com * Writes a string to the writer, which can be retrieved with 164dde0956375e87027df2fdd80d430dd819c217aacreed@google.com * SkReader32::readString(). 165dde0956375e87027df2fdd80d430dd819c217aacreed@google.com * The length can be specified, or if -1 is passed, it will be computed by 166dde0956375e87027df2fdd80d430dd819c217aacreed@google.com * calling strlen(). The length must be < 0xFFFF 167dde0956375e87027df2fdd80d430dd819c217aacreed@google.com */ 168dde0956375e87027df2fdd80d430dd819c217aacreed@google.com void writeString(const char* str, size_t len = (size_t)-1); 169dde0956375e87027df2fdd80d430dd819c217aacreed@google.com 170dde0956375e87027df2fdd80d430dd819c217aacreed@google.com /** 171dde0956375e87027df2fdd80d430dd819c217aacreed@google.com * Computes the size (aligned to multiple of 4) need to write the string 172dde0956375e87027df2fdd80d430dd819c217aacreed@google.com * in a call to writeString(). If the length is not specified, it will be 173dde0956375e87027df2fdd80d430dd819c217aacreed@google.com * computed by calling strlen(). 174dde0956375e87027df2fdd80d430dd819c217aacreed@google.com */ 175dde0956375e87027df2fdd80d430dd819c217aacreed@google.com static size_t WriteStringSize(const char* str, size_t len = (size_t)-1); 176dde0956375e87027df2fdd80d430dd819c217aacreed@google.com 1778a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // return the address of the 4byte int at the specified offset (which must 1788a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // be a multiple of 4. This does not allocate any new space, so the returned 1798a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // address is only valid for 1 int. 1808a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com uint32_t* peek32(size_t offset); 181fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 1821cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com /** 1831cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com * Move the cursor back to offset bytes from the beginning. 1841cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com * This has the same restrictions as peek32: offset must be <= size() and 1851cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com * offset must be a multiple of 4. 1861cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com */ 1871cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com void rewindToOffset(size_t offset); 1881cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com 1898a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // copy into a single buffer (allocated by caller). Must be at least size() 1908a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com void flatten(void* dst) const; 191fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 1928a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // read from the stream, and write up to length bytes. Return the actual 1938a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com // number of bytes written. 1948a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com size_t readFromStream(SkStream*, size_t length); 195fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 1968a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com bool writeToStream(SkWStream*); 1978a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 1988a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.comprivate: 1995595af1b2ebe6590e98641464d43d22281a7f295reed@google.com struct Block { 2005595af1b2ebe6590e98641464d43d22281a7f295reed@google.com Block* fNext; 2015595af1b2ebe6590e98641464d43d22281a7f295reed@google.com char* fBasePtr; 2025595af1b2ebe6590e98641464d43d22281a7f295reed@google.com size_t fSizeOfBlock; // total space allocated (after this) 2035595af1b2ebe6590e98641464d43d22281a7f295reed@google.com size_t fAllocatedSoFar; // space used so far 2045595af1b2ebe6590e98641464d43d22281a7f295reed@google.com 2055595af1b2ebe6590e98641464d43d22281a7f295reed@google.com size_t available() const { return fSizeOfBlock - fAllocatedSoFar; } 2065595af1b2ebe6590e98641464d43d22281a7f295reed@google.com char* base() { return fBasePtr; } 2075595af1b2ebe6590e98641464d43d22281a7f295reed@google.com const char* base() const { return fBasePtr; } 2085595af1b2ebe6590e98641464d43d22281a7f295reed@google.com 2095595af1b2ebe6590e98641464d43d22281a7f295reed@google.com uint32_t* alloc(size_t size) { 2105595af1b2ebe6590e98641464d43d22281a7f295reed@google.com SkASSERT(SkAlign4(size) == size); 2115595af1b2ebe6590e98641464d43d22281a7f295reed@google.com SkASSERT(this->available() >= size); 2125595af1b2ebe6590e98641464d43d22281a7f295reed@google.com void* ptr = this->base() + fAllocatedSoFar; 2135595af1b2ebe6590e98641464d43d22281a7f295reed@google.com fAllocatedSoFar += size; 2145595af1b2ebe6590e98641464d43d22281a7f295reed@google.com SkASSERT(fAllocatedSoFar <= fSizeOfBlock); 2155595af1b2ebe6590e98641464d43d22281a7f295reed@google.com return (uint32_t*)ptr; 2165595af1b2ebe6590e98641464d43d22281a7f295reed@google.com } 217acd471f47ccfb97cf2f2f00dc01cd1fd45bc1ef2reed@google.com 2185595af1b2ebe6590e98641464d43d22281a7f295reed@google.com uint32_t* peek32(size_t offset) { 2195595af1b2ebe6590e98641464d43d22281a7f295reed@google.com SkASSERT(offset <= fAllocatedSoFar + 4); 2205595af1b2ebe6590e98641464d43d22281a7f295reed@google.com void* ptr = this->base() + offset; 2215595af1b2ebe6590e98641464d43d22281a7f295reed@google.com return (uint32_t*)ptr; 2225595af1b2ebe6590e98641464d43d22281a7f295reed@google.com } 223b89a03c890668f98d9f8b269b6ad00824409435bskia.committer@gmail.com 2245595af1b2ebe6590e98641464d43d22281a7f295reed@google.com void rewind() { 2255595af1b2ebe6590e98641464d43d22281a7f295reed@google.com fNext = NULL; 2265595af1b2ebe6590e98641464d43d22281a7f295reed@google.com fAllocatedSoFar = 0; 2275595af1b2ebe6590e98641464d43d22281a7f295reed@google.com // keep fSizeOfBlock as is 2285595af1b2ebe6590e98641464d43d22281a7f295reed@google.com } 229b89a03c890668f98d9f8b269b6ad00824409435bskia.committer@gmail.com 2305595af1b2ebe6590e98641464d43d22281a7f295reed@google.com static Block* Create(size_t size) { 2315595af1b2ebe6590e98641464d43d22281a7f295reed@google.com SkASSERT(SkIsAlign4(size)); 2325595af1b2ebe6590e98641464d43d22281a7f295reed@google.com Block* block = (Block*)sk_malloc_throw(sizeof(Block) + size); 2335595af1b2ebe6590e98641464d43d22281a7f295reed@google.com block->fNext = NULL; 2345595af1b2ebe6590e98641464d43d22281a7f295reed@google.com block->fBasePtr = (char*)(block + 1); 2355595af1b2ebe6590e98641464d43d22281a7f295reed@google.com block->fSizeOfBlock = size; 2365595af1b2ebe6590e98641464d43d22281a7f295reed@google.com block->fAllocatedSoFar = 0; 2375595af1b2ebe6590e98641464d43d22281a7f295reed@google.com return block; 2385595af1b2ebe6590e98641464d43d22281a7f295reed@google.com } 239e49aca968ca27d90ca919a972a86839ecaf1224areed@google.com 2405595af1b2ebe6590e98641464d43d22281a7f295reed@google.com Block* initFromStorage(void* storage, size_t size) { 2415595af1b2ebe6590e98641464d43d22281a7f295reed@google.com SkASSERT(SkIsAlign4((intptr_t)storage)); 2425595af1b2ebe6590e98641464d43d22281a7f295reed@google.com SkASSERT(SkIsAlign4(size)); 2435595af1b2ebe6590e98641464d43d22281a7f295reed@google.com Block* block = this; 2445595af1b2ebe6590e98641464d43d22281a7f295reed@google.com block->fNext = NULL; 2455595af1b2ebe6590e98641464d43d22281a7f295reed@google.com block->fBasePtr = (char*)storage; 2465595af1b2ebe6590e98641464d43d22281a7f295reed@google.com block->fSizeOfBlock = size; 2475595af1b2ebe6590e98641464d43d22281a7f295reed@google.com block->fAllocatedSoFar = 0; 2485595af1b2ebe6590e98641464d43d22281a7f295reed@google.com return block; 2495595af1b2ebe6590e98641464d43d22281a7f295reed@google.com } 2505595af1b2ebe6590e98641464d43d22281a7f295reed@google.com }; 2515595af1b2ebe6590e98641464d43d22281a7f295reed@google.com 2525595af1b2ebe6590e98641464d43d22281a7f295reed@google.com enum { 2535595af1b2ebe6590e98641464d43d22281a7f295reed@google.com MIN_BLOCKSIZE = sizeof(SkWriter32::Block) + sizeof(intptr_t) 2545595af1b2ebe6590e98641464d43d22281a7f295reed@google.com }; 255b89a03c890668f98d9f8b269b6ad00824409435bskia.committer@gmail.com 2565595af1b2ebe6590e98641464d43d22281a7f295reed@google.com Block fExternalBlock; 2575595af1b2ebe6590e98641464d43d22281a7f295reed@google.com Block* fHead; 2585595af1b2ebe6590e98641464d43d22281a7f295reed@google.com Block* fTail; 2595595af1b2ebe6590e98641464d43d22281a7f295reed@google.com size_t fMinSize; 2605595af1b2ebe6590e98641464d43d22281a7f295reed@google.com uint32_t fSize; 261f56225c848cb0cd0fde4cb37558174ae096b93d1reed@google.com // sum of bytes written in all blocks *before* fTail 262f56225c848cb0cd0fde4cb37558174ae096b93d1reed@google.com uint32_t fWrittenBeforeLastBlock; 263f56225c848cb0cd0fde4cb37558174ae096b93d1reed@google.com 2645595af1b2ebe6590e98641464d43d22281a7f295reed@google.com bool isHeadExternallyAllocated() const { 2655595af1b2ebe6590e98641464d43d22281a7f295reed@google.com return fHead == &fExternalBlock; 2665595af1b2ebe6590e98641464d43d22281a7f295reed@google.com } 267e49aca968ca27d90ca919a972a86839ecaf1224areed@google.com 2688a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com Block* newBlock(size_t bytes); 269b89a03c890668f98d9f8b269b6ad00824409435bskia.committer@gmail.com 2705595af1b2ebe6590e98641464d43d22281a7f295reed@google.com // only call from reserve() 2715595af1b2ebe6590e98641464d43d22281a7f295reed@google.com Block* doReserve(size_t bytes); 2721cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com 2731cf58d03a87e1ff17cd47e9de3da4c678456618dreed@google.com SkDEBUGCODE(void validate() const;) 2748a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com}; 2758a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com 27651c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com/** 27751c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com * Helper class to allocated SIZE bytes as part of the writer, and to provide 27851c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com * that storage to the constructor as its initial storage buffer. 27951c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com * 28051c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com * This wrapper ensures proper alignment rules are met for the storage. 28151c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com */ 28251c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.comtemplate <size_t SIZE> class SkSWriter32 : public SkWriter32 { 28351c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.compublic: 28451c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com SkSWriter32(size_t minSize) : SkWriter32(minSize, fData.fStorage, SIZE) {} 285fbfcd5602128ec010c82cb733c9cdc0a3254f9f3rmistry@google.com 28651c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.comprivate: 28751c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com union { 28851c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com void* fPtrAlignment; 28951c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com double fDoubleAlignment; 29051c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com char fStorage[SIZE]; 29151c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com } fData; 29251c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com}; 29351c62a6cfadc302bb65bb5a98e358c93223dc73freed@google.com 2948a1c16ff38322f0210116fa7293eb8817c7e477ereed@android.com#endif 295