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| 1 #include "SkImageRef_ashmem.h" | |
| 2 #include "SkImageDecoder.h" | |
| 3 #include "SkThread.h" | |
| 4 | |
| 5 #include <sys/mman.h> | |
| 6 #include <unistd.h> | |
| 7 #include <cutils/ashmem.h> | |
| 8 | |
| 9 //#define TRACE_ASH_PURGE // just trace purges | |
| 10 | |
| 11 #ifdef DUMP_IMAGEREF_LIFECYCLE | |
| 12 #define DUMP_ASHMEM_LIFECYCLE | |
| 13 #else | |
| 14 // #define DUMP_ASHMEM_LIFECYCLE | |
| 15 #endif | |
| 16 | |
| 17 // ashmem likes lengths on page boundaries | |
| 18 static size_t roundToPageSize(size_t size) { | |
| 19 const size_t mask = getpagesize() - 1; | |
| 20 size_t newsize = (size + mask) & ~mask; | |
| 21 // SkDebugf("---- oldsize %d newsize %d\n", size, newsize); | |
| 22 return newsize; | |
| 23 } | |
| 24 | |
| 25 SkImageRef_ashmem::SkImageRef_ashmem(SkStream* stream, | |
| 26 SkBitmap::Config config, | |
| 27 int sampleSize) | |
| 28 : SkImageRef(stream, config, sampleSize) { | |
| 29 | |
| 30 fRec.fFD = -1; | |
| 31 fRec.fAddr = NULL; | |
| 32 fRec.fSize = 0; | |
| 33 fRec.fPinned = false; | |
| 34 | |
| 35 fCT = NULL; | |
| 36 } | |
| 37 | |
| 38 SkImageRef_ashmem::~SkImageRef_ashmem() { | |
| 39 fCT->safeUnref(); | |
| 40 this->closeFD(); | |
| 41 } | |
| 42 | |
| 43 void SkImageRef_ashmem::closeFD() { | |
| 44 if (-1 != fRec.fFD) { | |
| 45 #ifdef DUMP_ASHMEM_LIFECYCLE | |
| 46 SkDebugf("=== ashmem close %d\n", fRec.fFD); | |
| 47 #endif | |
| 48 SkASSERT(fRec.fAddr); | |
| 49 SkASSERT(fRec.fSize); | |
| 50 munmap(fRec.fAddr, fRec.fSize); | |
| 51 close(fRec.fFD); | |
| 52 fRec.fFD = -1; | |
| 53 } | |
| 54 } | |
| 55 | |
| 56 /////////////////////////////////////////////////////////////////////////////// | |
| 57 | |
| 58 class AshmemAllocator : public SkBitmap::Allocator { | |
| 59 public: | |
| 60 AshmemAllocator(SkAshmemRec* rec, const char name[]) | |
| 61 : fRec(rec), fName(name) {} | |
| 62 | |
| 63 virtual bool allocPixelRef(SkBitmap* bm, SkColorTable* ct) { | |
| 64 const size_t size = roundToPageSize(bm->getSize()); | |
| 65 int fd = fRec->fFD; | |
| 66 void* addr = fRec->fAddr; | |
| 67 | |
| 68 SkASSERT(!fRec->fPinned); | |
| 69 | |
| 70 if (-1 == fd) { | |
| 71 SkASSERT(NULL == addr); | |
| 72 SkASSERT(0 == fRec->fSize); | |
| 73 | |
| 74 fd = ashmem_create_region(fName, size); | |
| 75 #ifdef DUMP_ASHMEM_LIFECYCLE | |
| 76 SkDebugf("=== ashmem_create_region %s size=%d fd=%d\n", fName, size,
fd); | |
| 77 #endif | |
| 78 if (-1 == fd) { | |
| 79 SkDebugf("------- imageref_ashmem create failed <%s> %d\n", | |
| 80 fName, size); | |
| 81 return false; | |
| 82 } | |
| 83 | |
| 84 int err = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE); | |
| 85 if (err) { | |
| 86 SkDebugf("------ ashmem_set_prot_region(%d) failed %d %d\n", | |
| 87 fd, err, errno); | |
| 88 return false; | |
| 89 } | |
| 90 | |
| 91 addr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); | |
| 92 if (-1 == (long)addr) { | |
| 93 SkDebugf("---------- mmap failed for imageref_ashmem size=%d err
=%d\n", | |
| 94 size, errno); | |
| 95 return false; | |
| 96 } | |
| 97 | |
| 98 fRec->fFD = fd; | |
| 99 fRec->fAddr = addr; | |
| 100 fRec->fSize = size; | |
| 101 } else { | |
| 102 SkASSERT(addr); | |
| 103 SkASSERT(size == fRec->fSize); | |
| 104 (void)ashmem_pin_region(fd, 0, 0); | |
| 105 } | |
| 106 | |
| 107 bm->setPixels(addr, ct); | |
| 108 fRec->fPinned = true; | |
| 109 return true; | |
| 110 } | |
| 111 | |
| 112 private: | |
| 113 // we just point to our caller's memory, these are not copies | |
| 114 SkAshmemRec* fRec; | |
| 115 const char* fName; | |
| 116 }; | |
| 117 | |
| 118 bool SkImageRef_ashmem::onDecode(SkImageDecoder* codec, SkStream* stream, | |
| 119 SkBitmap* bitmap, SkBitmap::Config config, | |
| 120 SkImageDecoder::Mode mode) { | |
| 121 | |
| 122 if (SkImageDecoder::kDecodeBounds_Mode == mode) { | |
| 123 return this->INHERITED::onDecode(codec, stream, bitmap, config, mode); | |
| 124 } | |
| 125 | |
| 126 AshmemAllocator alloc(&fRec, this->getName()); | |
| 127 | |
| 128 codec->setAllocator(&alloc); | |
| 129 bool success = this->INHERITED::onDecode(codec, stream, bitmap, config, | |
| 130 mode); | |
| 131 // remove the allocator, since its on the stack | |
| 132 codec->setAllocator(NULL); | |
| 133 | |
| 134 if (success) { | |
| 135 // remember the colortable (if any) | |
| 136 SkRefCnt_SafeAssign(fCT, bitmap->getColorTable()); | |
| 137 return true; | |
| 138 } else { | |
| 139 if (fRec.fPinned) { | |
| 140 ashmem_unpin_region(fRec.fFD, 0, 0); | |
| 141 fRec.fPinned = false; | |
| 142 } | |
| 143 this->closeFD(); | |
| 144 return false; | |
| 145 } | |
| 146 } | |
| 147 | |
| 148 void* SkImageRef_ashmem::onLockPixels(SkColorTable** ct) { | |
| 149 SkASSERT(fBitmap.getPixels() == NULL); | |
| 150 SkASSERT(fBitmap.getColorTable() == NULL); | |
| 151 | |
| 152 // fast case: check if we can just pin and get the cached data | |
| 153 if (-1 != fRec.fFD) { | |
| 154 SkASSERT(fRec.fAddr); | |
| 155 SkASSERT(!fRec.fPinned); | |
| 156 int pin = ashmem_pin_region(fRec.fFD, 0, 0); | |
| 157 | |
| 158 if (ASHMEM_NOT_PURGED == pin) { // yea, fast case! | |
| 159 fBitmap.setPixels(fRec.fAddr, fCT); | |
| 160 fRec.fPinned = true; | |
| 161 } else if (ASHMEM_WAS_PURGED == pin) { | |
| 162 ashmem_unpin_region(fRec.fFD, 0, 0); | |
| 163 // let go of our colortable if we lost the pixels. Well get it back | |
| 164 // again when we re-decode | |
| 165 if (fCT) { | |
| 166 fCT->unref(); | |
| 167 fCT = NULL; | |
| 168 } | |
| 169 #if defined(DUMP_ASHMEM_LIFECYCLE) || defined(TRACE_ASH_PURGE) | |
| 170 SkDebugf("===== ashmem purged %d\n", fBitmap.getSize()); | |
| 171 #endif | |
| 172 } else { | |
| 173 SkDebugf("===== ashmem pin_region(%d) returned %d, treating as error
%d\n", | |
| 174 fRec.fFD, pin, errno); | |
| 175 // return null result for failure | |
| 176 if (ct) { | |
| 177 *ct = NULL; | |
| 178 } | |
| 179 return NULL; | |
| 180 } | |
| 181 } else { | |
| 182 // no FD, will create an ashmem region in allocator | |
| 183 } | |
| 184 | |
| 185 return this->INHERITED::onLockPixels(ct); | |
| 186 } | |
| 187 | |
| 188 void SkImageRef_ashmem::onUnlockPixels() { | |
| 189 this->INHERITED::onUnlockPixels(); | |
| 190 | |
| 191 if (-1 != fRec.fFD) { | |
| 192 SkASSERT(fRec.fAddr); | |
| 193 SkASSERT(fRec.fPinned); | |
| 194 | |
| 195 ashmem_unpin_region(fRec.fFD, 0, 0); | |
| 196 fRec.fPinned = false; | |
| 197 } | |
| 198 | |
| 199 // we clear this with or without an error, since we've either closed or | |
| 200 // unpinned the region | |
| 201 fBitmap.setPixels(NULL, NULL); | |
| 202 } | |
| 203 | |
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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/