reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | #include "SkImageRefPool.h" |
| 2 | #include "SkImageRef.h" |
| 3 | #include "SkThread.h" |
| 4 | |
| 5 | SkImageRefPool::SkImageRefPool() { |
| 6 | fRAMBudget = 0; // means no explicit limit |
| 7 | fRAMUsed = 0; |
| 8 | fCount = 0; |
| 9 | fHead = fTail = NULL; |
| 10 | } |
| 11 | |
| 12 | SkImageRefPool::~SkImageRefPool() { |
| 13 | // SkASSERT(NULL == fHead); |
| 14 | } |
| 15 | |
| 16 | void SkImageRefPool::setRAMBudget(size_t size) { |
| 17 | if (fRAMBudget != size) { |
| 18 | fRAMBudget = size; |
| 19 | this->purgeIfNeeded(); |
| 20 | } |
| 21 | } |
| 22 | |
| 23 | void SkImageRefPool::justAddedPixels(SkImageRef* ref) { |
| 24 | #ifdef DUMP_IMAGEREF_LIFECYCLE |
| 25 | SkDebugf("=== ImagePool: add pixels %s [%d %d %d] bytes=%d heap=%d\n", |
| 26 | ref->getURI(), |
| 27 | ref->fBitmap.width(), ref->fBitmap.height(), |
| 28 | ref->fBitmap.bytesPerPixel(), |
| 29 | ref->fBitmap.getSize(), (int)fRAMUsed); |
| 30 | #endif |
| 31 | fRAMUsed += ref->ramUsed(); |
| 32 | this->purgeIfNeeded(); |
| 33 | } |
| 34 | |
| 35 | void SkImageRefPool::canLosePixels(SkImageRef* ref) { |
| 36 | // the refs near fHead have recently been released (used) |
| 37 | // if we purge, we purge from the tail |
| 38 | this->detach(ref); |
| 39 | this->addToHead(ref); |
| 40 | this->purgeIfNeeded(); |
| 41 | } |
| 42 | |
| 43 | void SkImageRefPool::purgeIfNeeded() { |
| 44 | // do nothing if we have a zero-budget (i.e. unlimited) |
| 45 | if (fRAMBudget != 0) { |
| 46 | this->setRAMUsed(fRAMBudget); |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | void SkImageRefPool::setRAMUsed(size_t limit) { |
| 51 | SkImageRef* ref = fTail; |
| 52 | |
| 53 | while (NULL != ref && fRAMUsed > limit) { |
| 54 | // only purge it if its pixels are unlocked |
| 55 | if (0 == ref->getLockCount() && ref->fBitmap.getPixels()) { |
| 56 | size_t size = ref->ramUsed(); |
| 57 | SkASSERT(size <= fRAMUsed); |
| 58 | fRAMUsed -= size; |
| 59 | |
| 60 | #ifdef DUMP_IMAGEREF_LIFECYCLE |
| 61 | SkDebugf("=== ImagePool: purge %s [%d %d %d] bytes=%d heap=%d\n", |
| 62 | ref->getURI(), |
| 63 | ref->fBitmap.width(), ref->fBitmap.height(), |
| 64 | ref->fBitmap.bytesPerPixel(), |
| 65 | (int)size, (int)fRAMUsed); |
| 66 | #endif |
| 67 | |
| 68 | // remember the bitmap config (don't call reset), |
| 69 | // just clear the pixel memory |
| 70 | ref->fBitmap.setPixels(NULL); |
| 71 | SkASSERT(NULL == ref->fBitmap.getPixels()); |
| 72 | } |
| 73 | ref = ref->fPrev; |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | /////////////////////////////////////////////////////////////////////////////// |
| 78 | |
| 79 | void SkImageRefPool::addToHead(SkImageRef* ref) { |
| 80 | ref->fNext = fHead; |
| 81 | ref->fPrev = NULL; |
| 82 | |
| 83 | if (fHead) { |
| 84 | SkASSERT(NULL == fHead->fPrev); |
| 85 | fHead->fPrev = ref; |
| 86 | } |
| 87 | fHead = ref; |
| 88 | |
| 89 | if (NULL == fTail) { |
| 90 | fTail = ref; |
| 91 | } |
| 92 | fCount += 1; |
| 93 | SkASSERT(computeCount() == fCount); |
| 94 | |
| 95 | fRAMUsed += ref->ramUsed(); |
| 96 | } |
| 97 | |
| 98 | void SkImageRefPool::addToTail(SkImageRef* ref) { |
| 99 | ref->fNext = NULL; |
| 100 | ref->fPrev = fTail; |
| 101 | |
| 102 | if (fTail) { |
| 103 | SkASSERT(NULL == fTail->fNext); |
| 104 | fTail->fNext = ref; |
| 105 | } |
| 106 | fTail = ref; |
| 107 | |
| 108 | if (NULL == fHead) { |
| 109 | fHead = ref; |
| 110 | } |
| 111 | fCount += 1; |
| 112 | SkASSERT(computeCount() == fCount); |
| 113 | |
| 114 | fRAMUsed += ref->ramUsed(); |
| 115 | } |
| 116 | |
| 117 | void SkImageRefPool::detach(SkImageRef* ref) { |
| 118 | SkASSERT(fCount > 0); |
| 119 | |
| 120 | if (fHead == ref) { |
| 121 | fHead = ref->fNext; |
| 122 | } |
| 123 | if (fTail == ref) { |
| 124 | fTail = ref->fPrev; |
| 125 | } |
| 126 | if (ref->fPrev) { |
| 127 | ref->fPrev->fNext = ref->fNext; |
| 128 | } |
| 129 | if (ref->fNext) { |
| 130 | ref->fNext->fPrev = ref->fPrev; |
| 131 | } |
| 132 | |
| 133 | ref->fNext = ref->fPrev = NULL; |
| 134 | |
| 135 | fCount -= 1; |
| 136 | SkASSERT(computeCount() == fCount); |
| 137 | |
| 138 | SkASSERT(fRAMUsed >= ref->ramUsed()); |
| 139 | fRAMUsed -= ref->ramUsed(); |
| 140 | } |
| 141 | |
| 142 | int SkImageRefPool::computeCount() const { |
| 143 | SkImageRef* ref = fHead; |
| 144 | int count = 0; |
| 145 | |
| 146 | while (ref != NULL) { |
| 147 | count += 1; |
| 148 | ref = ref->fNext; |
| 149 | } |
| 150 | |
| 151 | #ifdef SK_DEBUG |
| 152 | ref = fTail; |
| 153 | int count2 = 0; |
| 154 | |
| 155 | while (ref != NULL) { |
| 156 | count2 += 1; |
| 157 | ref = ref->fPrev; |
| 158 | } |
| 159 | SkASSERT(count2 == count); |
| 160 | #endif |
| 161 | |
| 162 | return count; |
| 163 | } |
| 164 | |
| 165 | /////////////////////////////////////////////////////////////////////////////// |
| 166 | |
| 167 | #include "SkStream.h" |
| 168 | |
| 169 | void SkImageRefPool::dump() const { |
| 170 | #if defined(SK_DEBUG) || defined(DUMP_IMAGEREF_LIFECYCLE) |
| 171 | SkDebugf("ImagePool dump: bugdet: %d used: %d count: %d\n", |
| 172 | (int)fRAMBudget, (int)fRAMUsed, fCount); |
| 173 | |
| 174 | SkImageRef* ref = fHead; |
| 175 | |
| 176 | while (ref != NULL) { |
| 177 | SkDebugf(" [%3d %3d %d] ram=%d data=%d locks=%d %s\n", ref->fBitmap.width(), |
| 178 | ref->fBitmap.height(), ref->fBitmap.config(), |
| 179 | ref->ramUsed(), (int)ref->fStream->getLength(), |
| 180 | ref->getLockCount(), ref->getURI()); |
| 181 | |
| 182 | ref = ref->fNext; |
| 183 | } |
| 184 | #endif |
| 185 | } |
| 186 | |