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| 1 /* | |
| 2 * Copyright 2011 Google Inc. | |
| 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 "SkImageRef_ashmem.h" | |
| 9 #include "SkImageDecoder.h" | |
| 10 #include "SkReadBuffer.h" | |
| 11 #include "SkWriteBuffer.h" | |
| 12 #include "SkThread.h" | |
| 13 | |
| 14 #include "android/ashmem.h" | |
| 15 | |
| 16 #include <sys/mman.h> | |
| 17 #include <unistd.h> | |
| 18 | |
| 19 //#define TRACE_ASH_PURGE // just trace purges | |
| 20 | |
| 21 #ifdef DUMP_IMAGEREF_LIFECYCLE | |
| 22 #define DUMP_ASHMEM_LIFECYCLE | |
| 23 #else | |
| 24 // #define DUMP_ASHMEM_LIFECYCLE | |
| 25 #endif | |
| 26 | |
| 27 // ashmem likes lengths on page boundaries | |
| 28 static size_t roundToPageSize(size_t size) { | |
| 29 const size_t mask = getpagesize() - 1; | |
| 30 size_t newsize = (size + mask) & ~mask; | |
| 31 // SkDebugf("---- oldsize %d newsize %d\n", size, newsize); | |
| 32 return newsize; | |
| 33 } | |
| 34 | |
| 35 SkImageRef_ashmem::SkImageRef_ashmem(const SkImageInfo& info, | |
| 36 SkStreamRewindable* stream, | |
| 37 int sampleSize) | |
| 38 : SkImageRef(info, stream, sampleSize) | |
| 39 { | |
| 40 fRec.fFD = -1; | |
| 41 fRec.fAddr = NULL; | |
| 42 fRec.fSize = 0; | |
| 43 fRec.fPinned = false; | |
| 44 | |
| 45 fCT = NULL; | |
| 46 } | |
| 47 | |
| 48 SkImageRef_ashmem::~SkImageRef_ashmem() { | |
| 49 SkSafeUnref(fCT); | |
| 50 this->closeFD(); | |
| 51 } | |
| 52 | |
| 53 void SkImageRef_ashmem::closeFD() { | |
| 54 if (-1 != fRec.fFD) { | |
| 55 #ifdef DUMP_ASHMEM_LIFECYCLE | |
| 56 SkDebugf("=== ashmem close %d\n", fRec.fFD); | |
| 57 #endif | |
| 58 SkASSERT(fRec.fAddr); | |
| 59 SkASSERT(fRec.fSize); | |
| 60 munmap(fRec.fAddr, fRec.fSize); | |
| 61 close(fRec.fFD); | |
| 62 fRec.fFD = -1; | |
| 63 } | |
| 64 } | |
| 65 | |
| 66 /////////////////////////////////////////////////////////////////////////////// | |
| 67 | |
| 68 class AshmemAllocator : public SkBitmap::Allocator { | |
| 69 public: | |
| 70 AshmemAllocator(SkAshmemRec* rec, const char name[]) | |
| 71 : fRec(rec), fName(name) {} | |
| 72 | |
| 73 virtual bool allocPixelRef(SkBitmap* bm, SkColorTable* ct) { | |
| 74 const size_t size = roundToPageSize(bm->getSize()); | |
| 75 int fd = fRec->fFD; | |
| 76 void* addr = fRec->fAddr; | |
| 77 | |
| 78 SkASSERT(!fRec->fPinned); | |
| 79 | |
| 80 if (-1 == fd) { | |
| 81 SkASSERT(NULL == addr); | |
| 82 SkASSERT(0 == fRec->fSize); | |
| 83 | |
| 84 fd = ashmem_create_region(fName, size); | |
| 85 #ifdef DUMP_ASHMEM_LIFECYCLE | |
| 86 SkDebugf("=== ashmem_create_region %s size=%d fd=%d\n", fName, size,
fd); | |
| 87 #endif | |
| 88 if (-1 == fd) { | |
| 89 SkDebugf("------- imageref_ashmem create failed <%s> %d\n", | |
| 90 fName, size); | |
| 91 return false; | |
| 92 } | |
| 93 | |
| 94 int err = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE); | |
| 95 if (err) { | |
| 96 SkDebugf("------ ashmem_set_prot_region(%d) failed %d\n", | |
| 97 fd, err); | |
| 98 close(fd); | |
| 99 return false; | |
| 100 } | |
| 101 | |
| 102 addr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); | |
| 103 if (-1 == (long)addr) { | |
| 104 SkDebugf("---------- mmap failed for imageref_ashmem size=%d\n", | |
| 105 size); | |
| 106 close(fd); | |
| 107 return false; | |
| 108 } | |
| 109 | |
| 110 fRec->fFD = fd; | |
| 111 fRec->fAddr = addr; | |
| 112 fRec->fSize = size; | |
| 113 } else { | |
| 114 SkASSERT(addr); | |
| 115 SkASSERT(size == fRec->fSize); | |
| 116 (void)ashmem_pin_region(fd, 0, 0); | |
| 117 } | |
| 118 | |
| 119 bm->setPixels(addr, ct); | |
| 120 fRec->fPinned = true; | |
| 121 return true; | |
| 122 } | |
| 123 | |
| 124 private: | |
| 125 // we just point to our caller's memory, these are not copies | |
| 126 SkAshmemRec* fRec; | |
| 127 const char* fName; | |
| 128 }; | |
| 129 | |
| 130 bool SkImageRef_ashmem::onDecode(SkImageDecoder* codec, SkStreamRewindable* stre
am, | |
| 131 SkBitmap* bitmap, SkBitmap::Config config, | |
| 132 SkImageDecoder::Mode mode) { | |
| 133 | |
| 134 if (SkImageDecoder::kDecodeBounds_Mode == mode) { | |
| 135 return this->INHERITED::onDecode(codec, stream, bitmap, config, mode); | |
| 136 } | |
| 137 | |
| 138 // Ashmem memory is guaranteed to be initialized to 0. | |
| 139 codec->setSkipWritingZeroes(true); | |
| 140 | |
| 141 AshmemAllocator alloc(&fRec, this->getURI()); | |
| 142 | |
| 143 codec->setAllocator(&alloc); | |
| 144 bool success = this->INHERITED::onDecode(codec, stream, bitmap, config, | |
| 145 mode); | |
| 146 // remove the allocator, since its on the stack | |
| 147 codec->setAllocator(NULL); | |
| 148 | |
| 149 if (success) { | |
| 150 // remember the colortable (if any) | |
| 151 SkRefCnt_SafeAssign(fCT, bitmap->getColorTable()); | |
| 152 return true; | |
| 153 } else { | |
| 154 if (fRec.fPinned) { | |
| 155 ashmem_unpin_region(fRec.fFD, 0, 0); | |
| 156 fRec.fPinned = false; | |
| 157 } | |
| 158 this->closeFD(); | |
| 159 return false; | |
| 160 } | |
| 161 } | |
| 162 | |
| 163 bool SkImageRef_ashmem::onNewLockPixels(LockRec* rec) { | |
| 164 SkASSERT(fBitmap.getPixels() == NULL); | |
| 165 SkASSERT(fBitmap.getColorTable() == NULL); | |
| 166 | |
| 167 // fast case: check if we can just pin and get the cached data | |
| 168 if (-1 != fRec.fFD) { | |
| 169 SkASSERT(fRec.fAddr); | |
| 170 SkASSERT(!fRec.fPinned); | |
| 171 int pin = ashmem_pin_region(fRec.fFD, 0, 0); | |
| 172 | |
| 173 if (ASHMEM_NOT_PURGED == pin) { // yea, fast case! | |
| 174 fBitmap.setPixels(fRec.fAddr, fCT); | |
| 175 fRec.fPinned = true; | |
| 176 } else if (ASHMEM_WAS_PURGED == pin) { | |
| 177 ashmem_unpin_region(fRec.fFD, 0, 0); | |
| 178 // let go of our colortable if we lost the pixels. Well get it back | |
| 179 // again when we re-decode | |
| 180 if (fCT) { | |
| 181 fCT->unref(); | |
| 182 fCT = NULL; | |
| 183 } | |
| 184 #if defined(DUMP_ASHMEM_LIFECYCLE) || defined(TRACE_ASH_PURGE) | |
| 185 SkDebugf("===== ashmem purged %d\n", fBitmap.getSize()); | |
| 186 #endif | |
| 187 } else { | |
| 188 SkDebugf("===== ashmem pin_region(%d) returned %d\n", fRec.fFD, pin)
; | |
| 189 return false; | |
| 190 } | |
| 191 } else { | |
| 192 // no FD, will create an ashmem region in allocator | |
| 193 } | |
| 194 | |
| 195 return this->INHERITED::onNewLockPixels(rec); | |
| 196 } | |
| 197 | |
| 198 void SkImageRef_ashmem::onUnlockPixels() { | |
| 199 this->INHERITED::onUnlockPixels(); | |
| 200 | |
| 201 if (-1 != fRec.fFD) { | |
| 202 SkASSERT(fRec.fAddr); | |
| 203 SkASSERT(fRec.fPinned); | |
| 204 | |
| 205 ashmem_unpin_region(fRec.fFD, 0, 0); | |
| 206 fRec.fPinned = false; | |
| 207 } | |
| 208 | |
| 209 // we clear this with or without an error, since we've either closed or | |
| 210 // unpinned the region | |
| 211 fBitmap.setPixels(NULL, NULL); | |
| 212 } | |
| 213 | |
| 214 void SkImageRef_ashmem::flatten(SkWriteBuffer& buffer) const { | |
| 215 this->INHERITED::flatten(buffer); | |
| 216 buffer.writeString(getURI()); | |
| 217 } | |
| 218 | |
| 219 SkImageRef_ashmem::SkImageRef_ashmem(SkReadBuffer& buffer) | |
| 220 : INHERITED(buffer) { | |
| 221 fRec.fFD = -1; | |
| 222 fRec.fAddr = NULL; | |
| 223 fRec.fSize = 0; | |
| 224 fRec.fPinned = false; | |
| 225 fCT = NULL; | |
| 226 | |
| 227 SkString uri; | |
| 228 buffer.readString(&uri); | |
| 229 this->setURI(uri); | |
| 230 } | |
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Chromium Code Reviews
Issue 100183002:
Remove SkImageRef and related functionality. (Closed)
Base URL: https://skia.googlecode.com/svn/trunk