| |
| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #include "SkPixelRef.h" |
| #include "SkFlattenableBuffers.h" |
| #include "SkThread.h" |
| |
| SK_DEFINE_INST_COUNT(SkPixelRef) |
| |
| |
| #ifdef SK_USE_POSIX_THREADS |
| |
| static SkBaseMutex gPixelRefMutexRing[] = { |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| { PTHREAD_MUTEX_INITIALIZER }, { PTHREAD_MUTEX_INITIALIZER }, |
| }; |
| |
| // must be a power-of-2. undef to just use 1 mutex |
| #define PIXELREF_MUTEX_RING_COUNT SK_ARRAY_COUNT(gPixelRefMutexRing) |
| |
| #else // not pthreads |
| |
| // must be a power-of-2. undef to just use 1 mutex |
| #define PIXELREF_MUTEX_RING_COUNT 32 |
| static SkBaseMutex gPixelRefMutexRing[PIXELREF_MUTEX_RING_COUNT]; |
| |
| #endif |
| |
| static SkBaseMutex* get_default_mutex() { |
| static int32_t gPixelRefMutexRingIndex; |
| |
| SkASSERT(SkIsPow2(PIXELREF_MUTEX_RING_COUNT)); |
| |
| // atomic_inc might be overkill here. It may be fine if once in a while |
| // we hit a race-condition and two subsequent calls get the same index... |
| int index = sk_atomic_inc(&gPixelRefMutexRingIndex); |
| return &gPixelRefMutexRing[index & (PIXELREF_MUTEX_RING_COUNT - 1)]; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| int32_t SkNextPixelRefGenerationID(); |
| |
| int32_t SkNextPixelRefGenerationID() { |
| static int32_t gPixelRefGenerationID; |
| // do a loop in case our global wraps around, as we never want to |
| // return a 0 |
| int32_t genID; |
| do { |
| genID = sk_atomic_inc(&gPixelRefGenerationID) + 1; |
| } while (0 == genID); |
| return genID; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkPixelRef::setMutex(SkBaseMutex* mutex) { |
| if (NULL == mutex) { |
| mutex = get_default_mutex(); |
| } |
| fMutex = mutex; |
| } |
| |
| // just need a > 0 value, so pick a funny one to aid in debugging |
| #define SKPIXELREF_PRELOCKED_LOCKCOUNT 123456789 |
| |
| SkPixelRef::SkPixelRef(SkBaseMutex* mutex) { |
| this->setMutex(mutex); |
| fPixels = NULL; |
| fColorTable = NULL; // we do not track ownership of this |
| fLockCount = 0; |
| this->needsNewGenID(); |
| fIsImmutable = false; |
| fPreLocked = false; |
| } |
| |
| SkPixelRef::SkPixelRef(SkFlattenableReadBuffer& buffer, SkBaseMutex* mutex) |
| : INHERITED(buffer) { |
| this->setMutex(mutex); |
| fPixels = NULL; |
| fColorTable = NULL; // we do not track ownership of this |
| fLockCount = 0; |
| fIsImmutable = buffer.readBool(); |
| fGenerationID = buffer.readUInt(); |
| fUniqueGenerationID = false; // Conservatively assuming the original still exists. |
| fPreLocked = false; |
| } |
| |
| SkPixelRef::~SkPixelRef() { |
| this->callGenIDChangeListeners(); |
| } |
| |
| void SkPixelRef::needsNewGenID() { |
| fGenerationID = 0; |
| fUniqueGenerationID = false; |
| } |
| |
| void SkPixelRef::cloneGenID(const SkPixelRef& that) { |
| // This is subtle. We must call that.getGenerationID() to make sure its genID isn't 0. |
| this->fGenerationID = that.getGenerationID(); |
| this->fUniqueGenerationID = false; |
| that.fUniqueGenerationID = false; |
| } |
| |
| void SkPixelRef::setPreLocked(void* pixels, SkColorTable* ctable) { |
| #ifndef SK_IGNORE_PIXELREF_SETPRELOCKED |
| // only call me in your constructor, otherwise fLockCount tracking can get |
| // out of sync. |
| fPixels = pixels; |
| fColorTable = ctable; |
| fLockCount = SKPIXELREF_PRELOCKED_LOCKCOUNT; |
| fPreLocked = true; |
| #endif |
| } |
| |
| void SkPixelRef::flatten(SkFlattenableWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeBool(fIsImmutable); |
| // We write the gen ID into the picture for within-process recording. This |
| // is safe since the same genID will never refer to two different sets of |
| // pixels (barring overflow). However, each process has its own "namespace" |
| // of genIDs. So for cross-process recording we write a zero which will |
| // trigger assignment of a new genID in playback. |
| if (buffer.isCrossProcess()) { |
| buffer.writeUInt(0); |
| } else { |
| buffer.writeUInt(fGenerationID); |
| fUniqueGenerationID = false; // Conservative, a copy is probably about to exist. |
| } |
| } |
| |
| void SkPixelRef::lockPixels() { |
| SkASSERT(!fPreLocked || SKPIXELREF_PRELOCKED_LOCKCOUNT == fLockCount); |
| |
| if (!fPreLocked) { |
| SkAutoMutexAcquire ac(*fMutex); |
| |
| if (1 == ++fLockCount) { |
| fPixels = this->onLockPixels(&fColorTable); |
| } |
| } |
| } |
| |
| void SkPixelRef::unlockPixels() { |
| SkASSERT(!fPreLocked || SKPIXELREF_PRELOCKED_LOCKCOUNT == fLockCount); |
| |
| if (!fPreLocked) { |
| SkAutoMutexAcquire ac(*fMutex); |
| |
| SkASSERT(fLockCount > 0); |
| if (0 == --fLockCount) { |
| this->onUnlockPixels(); |
| fPixels = NULL; |
| fColorTable = NULL; |
| } |
| } |
| } |
| |
| bool SkPixelRef::lockPixelsAreWritable() const { |
| return this->onLockPixelsAreWritable(); |
| } |
| |
| bool SkPixelRef::onLockPixelsAreWritable() const { |
| return true; |
| } |
| |
| bool SkPixelRef::onImplementsDecodeInto() { |
| return false; |
| } |
| |
| bool SkPixelRef::onDecodeInto(int pow2, SkBitmap* bitmap) { |
| return false; |
| } |
| |
| uint32_t SkPixelRef::getGenerationID() const { |
| if (0 == fGenerationID) { |
| fGenerationID = SkNextPixelRefGenerationID(); |
| fUniqueGenerationID = true; // The only time we can be sure of this! |
| } |
| return fGenerationID; |
| } |
| |
| void SkPixelRef::addGenIDChangeListener(GenIDChangeListener* listener) { |
| if (NULL == listener || !fUniqueGenerationID) { |
| // No point in tracking this if we're not going to call it. |
| SkDELETE(listener); |
| return; |
| } |
| *fGenIDChangeListeners.append() = listener; |
| } |
| |
| void SkPixelRef::callGenIDChangeListeners() { |
| // We don't invalidate ourselves if we think another SkPixelRef is sharing our genID. |
| if (fUniqueGenerationID) { |
| for (int i = 0; i < fGenIDChangeListeners.count(); i++) { |
| fGenIDChangeListeners[i]->onChange(); |
| } |
| } |
| // Listeners get at most one shot, so whether these triggered or not, blow them away. |
| fGenIDChangeListeners.deleteAll(); |
| } |
| |
| void SkPixelRef::notifyPixelsChanged() { |
| #ifdef SK_DEBUG |
| if (fIsImmutable) { |
| SkDebugf("========== notifyPixelsChanged called on immutable pixelref"); |
| } |
| #endif |
| this->callGenIDChangeListeners(); |
| this->needsNewGenID(); |
| } |
| |
| void SkPixelRef::setImmutable() { |
| fIsImmutable = true; |
| } |
| |
| bool SkPixelRef::readPixels(SkBitmap* dst, const SkIRect* subset) { |
| return this->onReadPixels(dst, subset); |
| } |
| |
| bool SkPixelRef::onReadPixels(SkBitmap* dst, const SkIRect* subset) { |
| return false; |
| } |
| |
| SkData* SkPixelRef::onRefEncodedData() { |
| return NULL; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #ifdef SK_BUILD_FOR_ANDROID |
| void SkPixelRef::globalRef(void* data) { |
| this->ref(); |
| } |
| |
| void SkPixelRef::globalUnref() { |
| this->unref(); |
| } |
| #endif |