reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | /* |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 2 | * Copyright 2006 The Android Open Source Project |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 3 | * |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #ifndef SkStream_DEFINED |
| 9 | #define SkStream_DEFINED |
| 10 | |
| 11 | #include "SkRefCnt.h" |
| 12 | #include "SkScalar.h" |
| 13 | |
reed@google.com | 8d0b577 | 2011-06-24 13:07:31 +0000 | [diff] [blame] | 14 | class SkData; |
reed@google.com | 70442a6 | 2011-06-23 21:48:04 +0000 | [diff] [blame] | 15 | |
reed@google.com | 3b34505 | 2013-05-07 15:59:16 +0000 | [diff] [blame] | 16 | /** |
| 17 | * SkStream -- abstraction for a source of bytes. Subclasses can be backed by |
| 18 | * memory, or a file, or something else. |
| 19 | * |
| 20 | * NOTE: |
| 21 | * |
| 22 | * Classic "streams" APIs are sort of async, in that on a request for N |
| 23 | * bytes, they may return fewer than N bytes on a given call, in which case |
| 24 | * the caller can "try again" to get more bytes, eventually (modulo an error) |
| 25 | * receiving their total N bytes. |
skia.committer@gmail.com | 2b34fe0 | 2013-05-08 07:01:40 +0000 | [diff] [blame^] | 26 | * |
reed@google.com | 3b34505 | 2013-05-07 15:59:16 +0000 | [diff] [blame] | 27 | * Skia streams behave differently. They are effectively synchronous, and will |
| 28 | * always return all N bytes of the request if possible. If they return fewer |
| 29 | * (the read() call returns the number of bytes read) then that means there is |
| 30 | * no more data (at EOF or hit an error). The caller should *not* call again |
| 31 | * in hopes of fulfilling more of the request. |
| 32 | */ |
reed@google.com | f316634 | 2011-04-26 20:06:08 +0000 | [diff] [blame] | 33 | class SK_API SkStream : public SkRefCnt { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 34 | public: |
reed@google.com | e1575aa | 2013-03-18 21:08:46 +0000 | [diff] [blame] | 35 | /** |
| 36 | * Attempts to open the specified file, and return a stream to it (using |
| 37 | * mmap if available). On success, the caller must call unref() on the |
| 38 | * returned object. On failure, returns NULL. |
| 39 | */ |
| 40 | static SkStream* NewFromFile(const char path[]); |
skia.committer@gmail.com | 8eaddb0 | 2013-03-19 07:15:10 +0000 | [diff] [blame] | 41 | |
robertphillips@google.com | 15e9d3e | 2012-06-21 20:25:03 +0000 | [diff] [blame] | 42 | SK_DECLARE_INST_COUNT(SkStream) |
| 43 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 44 | /** Called to rewind to the beginning of the stream. If this cannot be |
| 45 | done, return false. |
| 46 | */ |
| 47 | virtual bool rewind() = 0; |
| 48 | /** If this stream represents a file, this method returns the file's name. |
| 49 | If it does not, it returns NULL (the default behavior). |
| 50 | */ |
| 51 | virtual const char* getFileName(); |
| 52 | /** Called to read or skip size number of bytes. |
| 53 | If buffer is NULL and size > 0, skip that many bytes, returning how many were skipped. |
| 54 | If buffer is NULL and size == 0, return the total length of the stream. |
| 55 | If buffer != NULL, copy the requested number of bytes into buffer, returning how many were copied. |
| 56 | @param buffer If buffer is NULL, ignore and just skip size bytes, otherwise copy size bytes into buffer |
| 57 | @param size The number of bytes to skip or copy |
| 58 | @return bytes read on success |
| 59 | */ |
| 60 | virtual size_t read(void* buffer, size_t size) = 0; |
| 61 | |
| 62 | /** Return the total length of the stream. |
| 63 | */ |
| 64 | size_t getLength() { return this->read(NULL, 0); } |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 65 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 66 | /** Skip the specified number of bytes, returning the actual number |
| 67 | of bytes that could be skipped. |
| 68 | */ |
| 69 | size_t skip(size_t bytes); |
| 70 | |
| 71 | /** If the stream is backed by RAM, this method returns the starting |
| 72 | address for the data. If not (i.e. it is backed by a file or other |
| 73 | structure), this method returns NULL. |
| 74 | The default implementation returns NULL. |
| 75 | */ |
| 76 | virtual const void* getMemoryBase(); |
| 77 | |
| 78 | int8_t readS8(); |
| 79 | int16_t readS16(); |
| 80 | int32_t readS32(); |
| 81 | |
| 82 | uint8_t readU8() { return (uint8_t)this->readS8(); } |
| 83 | uint16_t readU16() { return (uint16_t)this->readS16(); } |
| 84 | uint32_t readU32() { return (uint32_t)this->readS32(); } |
| 85 | |
| 86 | bool readBool() { return this->readU8() != 0; } |
| 87 | SkScalar readScalar(); |
| 88 | size_t readPackedUInt(); |
robertphillips@google.com | 15e9d3e | 2012-06-21 20:25:03 +0000 | [diff] [blame] | 89 | |
reed@google.com | 2e07942 | 2012-07-02 19:35:13 +0000 | [diff] [blame] | 90 | /** |
epoger@google.com | 8e3fb2d | 2013-03-20 15:56:03 +0000 | [diff] [blame] | 91 | * Reconstitute an SkData object that was written to the stream |
| 92 | * using SkWStream::writeData(). |
reed@google.com | 2e07942 | 2012-07-02 19:35:13 +0000 | [diff] [blame] | 93 | */ |
| 94 | SkData* readData(); |
| 95 | |
robertphillips@google.com | 15e9d3e | 2012-06-21 20:25:03 +0000 | [diff] [blame] | 96 | private: |
| 97 | typedef SkRefCnt INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 98 | }; |
| 99 | |
ctguil@chromium.org | dfc5ffe | 2011-03-30 20:14:49 +0000 | [diff] [blame] | 100 | class SK_API SkWStream : SkNoncopyable { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 101 | public: |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 102 | SK_DECLARE_INST_COUNT_ROOT(SkWStream) |
| 103 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 104 | virtual ~SkWStream(); |
| 105 | |
| 106 | /** Called to write bytes to a SkWStream. Returns true on success |
| 107 | @param buffer the address of at least size bytes to be written to the stream |
| 108 | @param size The number of bytes in buffer to write to the stream |
| 109 | @return true on success |
| 110 | */ |
| 111 | virtual bool write(const void* buffer, size_t size) = 0; |
| 112 | virtual void newline(); |
| 113 | virtual void flush(); |
| 114 | |
| 115 | // helpers |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 116 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 117 | bool write8(U8CPU); |
| 118 | bool write16(U16CPU); |
| 119 | bool write32(uint32_t); |
| 120 | |
| 121 | bool writeText(const char text[]); |
| 122 | bool writeDecAsText(int32_t); |
vandebo@chromium.org | d877fdb | 2010-10-12 23:08:13 +0000 | [diff] [blame] | 123 | bool writeBigDecAsText(int64_t, int minDigits = 0); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 124 | bool writeHexAsText(uint32_t, int minDigits = 0); |
| 125 | bool writeScalarAsText(SkScalar); |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 126 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 127 | bool writeBool(bool v) { return this->write8(v); } |
| 128 | bool writeScalar(SkScalar); |
| 129 | bool writePackedUInt(size_t); |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 130 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 131 | bool writeStream(SkStream* input, size_t length); |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 132 | |
epoger@google.com | 8e3fb2d | 2013-03-20 15:56:03 +0000 | [diff] [blame] | 133 | /** |
| 134 | * Append an SkData object to the stream, such that it can be read |
| 135 | * out of the stream using SkStream::readData(). |
| 136 | * |
| 137 | * Note that the encoding method used to write the SkData object |
| 138 | * to the stream may change over time. This method DOES NOT |
| 139 | * just write the raw content of the SkData object to the stream. |
| 140 | */ |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 141 | bool writeData(const SkData*); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 142 | }; |
| 143 | |
| 144 | //////////////////////////////////////////////////////////////////////////////////////// |
| 145 | |
| 146 | #include "SkString.h" |
| 147 | |
| 148 | struct SkFILE; |
| 149 | |
| 150 | /** A stream that reads from a FILE*, which is opened in the constructor and |
| 151 | closed in the destructor |
| 152 | */ |
reed@google.com | a718c5e | 2013-03-05 17:49:10 +0000 | [diff] [blame] | 153 | class SK_API SkFILEStream : public SkStream { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 154 | public: |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 155 | SK_DECLARE_INST_COUNT(SkFILEStream) |
| 156 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 157 | /** Initialize the stream by calling fopen on the specified path. Will be |
| 158 | closed in the destructor. |
| 159 | */ |
| 160 | explicit SkFILEStream(const char path[] = NULL); |
| 161 | virtual ~SkFILEStream(); |
| 162 | |
| 163 | /** Returns true if the current path could be opened. |
| 164 | */ |
| 165 | bool isValid() const { return fFILE != NULL; } |
| 166 | /** Close the current file, and open a new file with the specified |
| 167 | path. If path is NULL, just close the current file. |
| 168 | */ |
| 169 | void setPath(const char path[]); |
| 170 | |
tomhudson@google.com | 1341304 | 2011-10-03 16:01:10 +0000 | [diff] [blame] | 171 | virtual bool rewind() SK_OVERRIDE; |
| 172 | virtual size_t read(void* buffer, size_t size) SK_OVERRIDE; |
| 173 | virtual const char* getFileName() SK_OVERRIDE; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 174 | |
| 175 | private: |
| 176 | SkFILE* fFILE; |
| 177 | SkString fName; |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 178 | |
| 179 | typedef SkStream INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 180 | }; |
| 181 | |
| 182 | /** A stream that reads from a file descriptor |
| 183 | */ |
reed@google.com | a718c5e | 2013-03-05 17:49:10 +0000 | [diff] [blame] | 184 | class SK_API SkFDStream : public SkStream { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 185 | public: |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 186 | SK_DECLARE_INST_COUNT(SkFDStream) |
| 187 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 188 | /** Initialize the stream with a dup() of the specified file descriptor. |
| 189 | If closeWhenDone is true, then the descriptor will be closed in the |
| 190 | destructor. |
| 191 | */ |
| 192 | SkFDStream(int fileDesc, bool closeWhenDone); |
| 193 | virtual ~SkFDStream(); |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 194 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 195 | /** Returns true if the current path could be opened. |
| 196 | */ |
| 197 | bool isValid() const { return fFD >= 0; } |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 198 | |
tomhudson@google.com | 1341304 | 2011-10-03 16:01:10 +0000 | [diff] [blame] | 199 | virtual bool rewind() SK_OVERRIDE; |
| 200 | virtual size_t read(void* buffer, size_t size) SK_OVERRIDE; |
| 201 | virtual const char* getFileName() SK_OVERRIDE { return NULL; } |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 202 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 203 | private: |
| 204 | int fFD; |
| 205 | bool fCloseWhenDone; |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 206 | |
| 207 | typedef SkStream INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 208 | }; |
| 209 | |
reed@google.com | a718c5e | 2013-03-05 17:49:10 +0000 | [diff] [blame] | 210 | class SK_API SkMemoryStream : public SkStream { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 211 | public: |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 212 | SK_DECLARE_INST_COUNT(SkMemoryStream) |
| 213 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 214 | SkMemoryStream(); |
| 215 | /** We allocate (and free) the memory. Write to it via getMemoryBase() |
| 216 | */ |
| 217 | SkMemoryStream(size_t length); |
| 218 | /** if copyData is true, the stream makes a private copy of the data |
| 219 | */ |
| 220 | SkMemoryStream(const void* data, size_t length, bool copyData = false); |
scroggo@google.com | e490420 | 2013-01-09 22:02:58 +0000 | [diff] [blame] | 221 | |
| 222 | /** |
| 223 | * Use the specified data as the memory for this stream. The stream will |
| 224 | * call ref() on the data (assuming it is not null). |
| 225 | */ |
| 226 | SkMemoryStream(SkData*); |
| 227 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 228 | virtual ~SkMemoryStream(); |
| 229 | |
| 230 | /** Resets the stream to the specified data and length, |
| 231 | just like the constructor. |
| 232 | if copyData is true, the stream makes a private copy of the data |
| 233 | */ |
| 234 | virtual void setMemory(const void* data, size_t length, |
| 235 | bool copyData = false); |
djsollen@google.com | 57f4969 | 2011-02-23 20:46:31 +0000 | [diff] [blame] | 236 | /** Replace any memory buffer with the specified buffer. The caller |
| 237 | must have allocated data with sk_malloc or sk_realloc, since it |
| 238 | will be freed with sk_free. |
| 239 | */ |
| 240 | void setMemoryOwned(const void* data, size_t length); |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 241 | |
| 242 | /** |
| 243 | * Return the stream's data in a SkData. The caller must call unref() when |
| 244 | * it is finished using the data. |
| 245 | */ |
| 246 | SkData* copyToData() const; |
| 247 | |
| 248 | /** |
| 249 | * Use the specified data as the memory for this stream. The stream will |
| 250 | * call ref() on the data (assuming it is not null). The function returns |
| 251 | * the data parameter as a convenience. |
| 252 | */ |
| 253 | SkData* setData(SkData*); |
| 254 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 255 | void skipToAlign4(); |
tomhudson@google.com | 1341304 | 2011-10-03 16:01:10 +0000 | [diff] [blame] | 256 | virtual bool rewind() SK_OVERRIDE; |
| 257 | virtual size_t read(void* buffer, size_t size) SK_OVERRIDE; |
| 258 | virtual const void* getMemoryBase() SK_OVERRIDE; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 259 | const void* getAtPos(); |
| 260 | size_t seek(size_t offset); |
| 261 | size_t peek() const { return fOffset; } |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 262 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 263 | private: |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 264 | SkData* fData; |
| 265 | size_t fOffset; |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 266 | |
| 267 | typedef SkStream INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 268 | }; |
| 269 | |
| 270 | /** \class SkBufferStream |
| 271 | This is a wrapper class that adds buffering to another stream. |
| 272 | The caller can provide the buffer, or ask SkBufferStream to allocated/free |
| 273 | it automatically. |
| 274 | */ |
reed@google.com | a718c5e | 2013-03-05 17:49:10 +0000 | [diff] [blame] | 275 | class SK_API SkBufferStream : public SkStream { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 276 | public: |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 277 | SK_DECLARE_INST_COUNT(SkBufferStream) |
| 278 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 279 | /** Provide the stream to be buffered (proxy), and the size of the buffer that |
| 280 | should be used. This will be allocated and freed automatically. If bufferSize is 0, |
| 281 | a default buffer size will be used. |
| 282 | The proxy stream is referenced, and will be unreferenced in when the |
| 283 | bufferstream is destroyed. |
| 284 | */ |
| 285 | SkBufferStream(SkStream* proxy, size_t bufferSize = 0); |
| 286 | /** Provide the stream to be buffered (proxy), and a buffer and size to be used. |
| 287 | This buffer is owned by the caller, and must be at least bufferSize bytes big. |
| 288 | Passing NULL for buffer will cause the buffer to be allocated/freed automatically. |
| 289 | If buffer is not NULL, it is an error for bufferSize to be 0. |
| 290 | The proxy stream is referenced, and will be unreferenced in when the |
| 291 | bufferstream is destroyed. |
| 292 | */ |
| 293 | SkBufferStream(SkStream* proxy, void* buffer, size_t bufferSize); |
| 294 | virtual ~SkBufferStream(); |
| 295 | |
tomhudson@google.com | 1341304 | 2011-10-03 16:01:10 +0000 | [diff] [blame] | 296 | virtual bool rewind() SK_OVERRIDE; |
| 297 | virtual const char* getFileName() SK_OVERRIDE; |
| 298 | virtual size_t read(void* buffer, size_t size) SK_OVERRIDE; |
| 299 | virtual const void* getMemoryBase() SK_OVERRIDE; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 300 | |
| 301 | private: |
| 302 | enum { |
| 303 | kDefaultBufferSize = 128 |
| 304 | }; |
| 305 | // illegal |
| 306 | SkBufferStream(const SkBufferStream&); |
| 307 | SkBufferStream& operator=(const SkBufferStream&); |
| 308 | |
| 309 | SkStream* fProxy; |
| 310 | char* fBuffer; |
| 311 | size_t fOrigBufferSize, fBufferSize, fBufferOffset; |
| 312 | bool fWeOwnTheBuffer; |
| 313 | |
| 314 | void init(void*, size_t); |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 315 | |
| 316 | typedef SkStream INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 317 | }; |
| 318 | |
| 319 | ///////////////////////////////////////////////////////////////////////////////////////////// |
| 320 | |
alokp@chromium.org | f7751ae | 2012-07-17 19:10:36 +0000 | [diff] [blame] | 321 | class SK_API SkFILEWStream : public SkWStream { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 322 | public: |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 323 | SK_DECLARE_INST_COUNT(SkFILEWStream) |
| 324 | |
| 325 | SkFILEWStream(const char path[]); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 326 | virtual ~SkFILEWStream(); |
| 327 | |
| 328 | /** Returns true if the current path could be opened. |
| 329 | */ |
| 330 | bool isValid() const { return fFILE != NULL; } |
| 331 | |
tomhudson@google.com | 1341304 | 2011-10-03 16:01:10 +0000 | [diff] [blame] | 332 | virtual bool write(const void* buffer, size_t size) SK_OVERRIDE; |
| 333 | virtual void flush() SK_OVERRIDE; |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 334 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 335 | private: |
| 336 | SkFILE* fFILE; |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 337 | |
| 338 | typedef SkWStream INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 339 | }; |
| 340 | |
| 341 | class SkMemoryWStream : public SkWStream { |
| 342 | public: |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 343 | SK_DECLARE_INST_COUNT(SkMemoryWStream) |
| 344 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 345 | SkMemoryWStream(void* buffer, size_t size); |
tomhudson@google.com | 1341304 | 2011-10-03 16:01:10 +0000 | [diff] [blame] | 346 | virtual bool write(const void* buffer, size_t size) SK_OVERRIDE; |
junov@chromium.org | 1cc8f6f | 2012-02-22 21:00:42 +0000 | [diff] [blame] | 347 | size_t bytesWritten() const { return fBytesWritten; } |
| 348 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 349 | private: |
| 350 | char* fBuffer; |
| 351 | size_t fMaxLength; |
| 352 | size_t fBytesWritten; |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 353 | |
| 354 | typedef SkWStream INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 355 | }; |
| 356 | |
ctguil@chromium.org | dfc5ffe | 2011-03-30 20:14:49 +0000 | [diff] [blame] | 357 | class SK_API SkDynamicMemoryWStream : public SkWStream { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 358 | public: |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 359 | SK_DECLARE_INST_COUNT(SkDynamicMemoryWStream) |
| 360 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 361 | SkDynamicMemoryWStream(); |
| 362 | virtual ~SkDynamicMemoryWStream(); |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 363 | |
tomhudson@google.com | 1341304 | 2011-10-03 16:01:10 +0000 | [diff] [blame] | 364 | virtual bool write(const void* buffer, size_t size) SK_OVERRIDE; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 365 | // random access write |
| 366 | // modifies stream and returns true if offset + size is less than or equal to getOffset() |
| 367 | bool write(const void* buffer, size_t offset, size_t size); |
| 368 | bool read(void* buffer, size_t offset, size_t size); |
vandebo@chromium.org | a518086 | 2010-10-26 19:48:49 +0000 | [diff] [blame] | 369 | size_t getOffset() const { return fBytesWritten; } |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 370 | size_t bytesWritten() const { return fBytesWritten; } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 371 | |
| 372 | // copy what has been written to the stream into dst |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 373 | void copyTo(void* dst) const; |
reed@google.com | 70442a6 | 2011-06-23 21:48:04 +0000 | [diff] [blame] | 374 | |
| 375 | /** |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 376 | * Return a copy of the data written so far. This call is responsible for |
| 377 | * calling unref() when they are finished with the data. |
reed@google.com | 70442a6 | 2011-06-23 21:48:04 +0000 | [diff] [blame] | 378 | */ |
reed@google.com | 8d0b577 | 2011-06-24 13:07:31 +0000 | [diff] [blame] | 379 | SkData* copyToData() const; |
reed@google.com | 70442a6 | 2011-06-23 21:48:04 +0000 | [diff] [blame] | 380 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 381 | // reset the stream to its original state |
| 382 | void reset(); |
| 383 | void padToAlign4(); |
| 384 | private: |
| 385 | struct Block; |
| 386 | Block* fHead; |
| 387 | Block* fTail; |
| 388 | size_t fBytesWritten; |
reed@google.com | 8a85d0c | 2011-06-24 19:12:12 +0000 | [diff] [blame] | 389 | mutable SkData* fCopy; // is invalidated if we write after it is created |
| 390 | |
| 391 | void invalidateCopy(); |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 392 | |
| 393 | typedef SkWStream INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 394 | }; |
| 395 | |
| 396 | |
reed@google.com | a718c5e | 2013-03-05 17:49:10 +0000 | [diff] [blame] | 397 | class SK_API SkDebugWStream : public SkWStream { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 398 | public: |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 399 | SK_DECLARE_INST_COUNT(SkDebugWStream) |
| 400 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 401 | // overrides |
tomhudson@google.com | 1341304 | 2011-10-03 16:01:10 +0000 | [diff] [blame] | 402 | virtual bool write(const void* buffer, size_t size) SK_OVERRIDE; |
| 403 | virtual void newline() SK_OVERRIDE; |
reed@google.com | 3b42998 | 2012-06-26 15:30:08 +0000 | [diff] [blame] | 404 | |
| 405 | private: |
| 406 | typedef SkWStream INHERITED; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 407 | }; |
| 408 | |
| 409 | // for now |
| 410 | typedef SkFILEStream SkURLStream; |
| 411 | |
| 412 | #endif |