reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | #include "SkImageRef.h" |
| 2 | #include "SkBitmap.h" |
| 3 | #include "SkFlattenable.h" |
| 4 | #include "SkImageDecoder.h" |
| 5 | #include "SkStream.h" |
| 6 | #include "SkTemplates.h" |
| 7 | #include "SkThread.h" |
| 8 | |
| 9 | // can't be static, as SkImageRef_Pool needs to see it |
| 10 | SkMutex gImageRefMutex; |
| 11 | |
| 12 | /////////////////////////////////////////////////////////////////////////////// |
| 13 | |
| 14 | SkImageRef::SkImageRef(SkStream* stream, SkBitmap::Config config, |
| 15 | int sampleSize) |
| 16 | : SkPixelRef(&gImageRefMutex), fErrorInDecoding(false) { |
| 17 | SkASSERT(stream); |
| 18 | SkASSERT(1 == stream->getRefCnt()); |
| 19 | |
| 20 | fStream = stream; |
| 21 | fConfig = config; |
| 22 | fSampleSize = sampleSize; |
| 23 | fPrev = fNext = NULL; |
| 24 | |
| 25 | #ifdef DUMP_IMAGEREF_LIFECYCLE |
| 26 | SkDebugf("add ImageRef %p [%d] data=%d\n", |
| 27 | this, config, (int)stream->getLength()); |
| 28 | #endif |
| 29 | } |
| 30 | |
| 31 | SkImageRef::~SkImageRef() { |
| 32 | SkASSERT(&gImageRefMutex == this->mutex()); |
| 33 | |
| 34 | #ifdef DUMP_IMAGEREF_LIFECYCLE |
| 35 | SkDebugf("delete ImageRef %p [%d] data=%d\n", |
| 36 | this, fConfig, (int)fStream->getLength()); |
| 37 | #endif |
| 38 | |
| 39 | delete fStream; |
| 40 | } |
| 41 | |
| 42 | bool SkImageRef::getInfo(SkBitmap* bitmap) { |
| 43 | SkAutoMutexAcquire ac(gImageRefMutex); |
| 44 | |
| 45 | if (!this->prepareBitmap(SkImageDecoder::kDecodeBounds_Mode)) { |
| 46 | return false; |
| 47 | } |
| 48 | |
| 49 | SkASSERT(SkBitmap::kNo_Config != fBitmap.config()); |
| 50 | if (bitmap) { |
| 51 | bitmap->setConfig(fBitmap.config(), fBitmap.width(), fBitmap.height()); |
| 52 | } |
| 53 | return true; |
| 54 | } |
| 55 | |
| 56 | /////////////////////////////////////////////////////////////////////////////// |
| 57 | |
| 58 | bool SkImageRef::onDecode(SkImageDecoder* codec, SkStream* stream, |
| 59 | SkBitmap* bitmap, SkBitmap::Config config, |
| 60 | SkImageDecoder::Mode mode) { |
| 61 | return codec->decode(stream, bitmap, config, mode); |
| 62 | } |
| 63 | |
| 64 | bool SkImageRef::prepareBitmap(SkImageDecoder::Mode mode) { |
| 65 | SkASSERT(&gImageRefMutex == this->mutex()); |
| 66 | |
| 67 | if (fErrorInDecoding) { |
| 68 | return false; |
| 69 | } |
| 70 | |
| 71 | /* As soon as we really know our config, we record it, so that on |
| 72 | subsequent calls to the codec, we are sure we will always get the same |
| 73 | result. |
| 74 | */ |
| 75 | if (SkBitmap::kNo_Config != fBitmap.config()) { |
| 76 | fConfig = fBitmap.config(); |
| 77 | } |
| 78 | |
| 79 | if (NULL != fBitmap.getPixels() || |
| 80 | (SkBitmap::kNo_Config != fBitmap.config() && |
| 81 | SkImageDecoder::kDecodeBounds_Mode == mode)) { |
| 82 | return true; |
| 83 | } |
| 84 | |
| 85 | SkASSERT(fBitmap.getPixels() == NULL); |
| 86 | |
| 87 | fStream->rewind(); |
| 88 | |
| 89 | SkImageDecoder* codec = SkImageDecoder::Factory(fStream); |
| 90 | if (codec) { |
| 91 | SkAutoTDelete<SkImageDecoder> ad(codec); |
| 92 | |
| 93 | codec->setSampleSize(fSampleSize); |
| 94 | if (this->onDecode(codec, fStream, &fBitmap, fConfig, mode)) { |
| 95 | return true; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | #ifdef DUMP_IMAGEREF_LIFECYCLE |
| 100 | if (NULL == codec) { |
| 101 | SkDebugf("--- ImageRef: <%s> failed to find codec\n", this->getURI()); |
| 102 | } else { |
| 103 | SkDebugf("--- ImageRef: <%s> failed in codec for %d mode\n", |
| 104 | this->getURI(), mode); |
| 105 | } |
| 106 | #endif |
| 107 | fErrorInDecoding = true; |
| 108 | fBitmap.reset(); |
| 109 | return false; |
| 110 | } |
| 111 | |
| 112 | void* SkImageRef::onLockPixels(SkColorTable** ct) { |
| 113 | SkASSERT(&gImageRefMutex == this->mutex()); |
| 114 | |
| 115 | if (NULL == fBitmap.getPixels()) { |
| 116 | (void)this->prepareBitmap(SkImageDecoder::kDecodePixels_Mode); |
| 117 | } |
| 118 | |
| 119 | if (ct) { |
| 120 | *ct = fBitmap.getColorTable(); |
| 121 | } |
| 122 | return fBitmap.getPixels(); |
| 123 | } |
| 124 | |
| 125 | void SkImageRef::onUnlockPixels() { |
| 126 | // we're already have the mutex locked |
| 127 | SkASSERT(&gImageRefMutex == this->mutex()); |
| 128 | } |
| 129 | |
| 130 | size_t SkImageRef::ramUsed() const { |
| 131 | size_t size = 0; |
| 132 | |
| 133 | if (fBitmap.getPixels()) { |
| 134 | size = fBitmap.getSize(); |
| 135 | if (fBitmap.getColorTable()) { |
| 136 | size += fBitmap.getColorTable()->count() * sizeof(SkPMColor); |
| 137 | } |
| 138 | } |
| 139 | return size; |
| 140 | } |
| 141 | |
| 142 | /////////////////////////////////////////////////////////////////////////////// |
| 143 | |
| 144 | SkImageRef::SkImageRef(SkFlattenableReadBuffer& buffer) |
| 145 | : INHERITED(buffer, &gImageRefMutex), fErrorInDecoding(false) { |
| 146 | fConfig = (SkBitmap::Config)buffer.readU8(); |
| 147 | fSampleSize = buffer.readU8(); |
| 148 | size_t length = buffer.readU32(); |
| 149 | fStream = SkNEW_ARGS(SkMemoryStream, (length)); |
| 150 | buffer.read((void*)fStream->getMemoryBase(), length); |
| 151 | |
| 152 | fPrev = fNext = NULL; |
| 153 | } |
| 154 | |
| 155 | void SkImageRef::flatten(SkFlattenableWriteBuffer& buffer) const { |
| 156 | this->INHERITED::flatten(buffer); |
| 157 | |
| 158 | buffer.write8(fConfig); |
| 159 | buffer.write8(fSampleSize); |
| 160 | size_t length = fStream->getLength(); |
| 161 | buffer.write32(length); |
| 162 | fStream->rewind(); |
| 163 | buffer.readFromStream(fStream, length); |
| 164 | } |
| 165 | |