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/*
* 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 "SkBitmapCache.h"
#include "SkMutex.h"
#include "SkPixelRef.h"
#include "SkTraceEvent.h"
//#define SK_TRACE_PIXELREF_LIFETIME
#include "SkNextID.h"
uint32_t SkNextID::ImageID() {
static uint32_t gID = 0;
uint32_t id;
// Loop in case our global wraps around, as we never want to return a 0.
do {
id = sk_atomic_fetch_add(&gID, 2u) + 2; // Never set the low bit.
} while (0 == id);
return id;
}
///////////////////////////////////////////////////////////////////////////////
static SkImageInfo validate_info(const SkImageInfo& info) {
SkAlphaType newAlphaType = info.alphaType();
SkAssertResult(SkColorTypeValidateAlphaType(info.colorType(), info.alphaType(), &newAlphaType));
return info.makeAlphaType(newAlphaType);
}
static void validate_pixels_ctable(const SkImageInfo& info, const SkColorTable* ctable) {
if (info.isEmpty()) {
return; // can't require ctable if the dimensions are empty
}
if (kIndex_8_SkColorType == info.colorType()) {
SkASSERT(ctable);
} else {
SkASSERT(nullptr == ctable);
}
}
#ifdef SK_TRACE_PIXELREF_LIFETIME
static int32_t gInstCounter;
#endif
SkPixelRef::SkPixelRef(const SkImageInfo& info, void* pixels, size_t rowBytes,
sk_sp<SkColorTable> ctable)
: fInfo(validate_info(info))
, fCTable(std::move(ctable))
, fPixels(pixels)
, fRowBytes(rowBytes)
#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
, fStableID(SkNextID::ImageID())
#endif
{
validate_pixels_ctable(fInfo, fCTable.get());
SkASSERT(rowBytes >= info.minRowBytes());
#ifdef SK_TRACE_PIXELREF_LIFETIME
SkDebugf(" pixelref %d\n", sk_atomic_inc(&gInstCounter));
#endif
this->needsNewGenID();
fMutability = kMutable;
fAddedToCache.store(false);
}
SkPixelRef::~SkPixelRef() {
#ifdef SK_TRACE_PIXELREF_LIFETIME
SkDebugf("~pixelref %d\n", sk_atomic_dec(&gInstCounter) - 1);
#endif
this->callGenIDChangeListeners();
}
#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
// This is undefined if there are clients in-flight trying to use us
void SkPixelRef::android_only_reset(const SkImageInfo& info, size_t rowBytes,
sk_sp<SkColorTable> ctable) {
validate_pixels_ctable(info, ctable.get());
*const_cast<SkImageInfo*>(&fInfo) = info;
fCTable = std::move(ctable);
// note: we do not change fRec.fPixels
fRec.fRowBytes = rowBytes;
fRec.fColorTable = fCTable.get();
// conservative, since its possible the "new" settings are the same as the old.
this->notifyPixelsChanged();
}
#endif
void SkPixelRef::needsNewGenID() {
fTaggedGenID.store(0);
SkASSERT(!this->genIDIsUnique()); // This method isn't threadsafe, so the assert should be fine.
}
void SkPixelRef::cloneGenID(const SkPixelRef& that) {
// This is subtle. We must call that.getGenerationID() to make sure its genID isn't 0.
uint32_t genID = that.getGenerationID();
// Neither ID is unique any more.
// (These & ~1u are actually redundant. that.getGenerationID() just did it for us.)
this->fTaggedGenID.store(genID & ~1u);
that. fTaggedGenID.store(genID & ~1u);
// This method isn't threadsafe, so these asserts should be fine.
SkASSERT(!this->genIDIsUnique());
SkASSERT(!that. genIDIsUnique());
}
#ifdef SK_SUPPORT_OBSOLETE_LOCKPIXELS
bool SkPixelRef::lockPixels(LockRec* rec) {
if (fPixels) {
rec->fPixels = fPixels;
rec->fRowBytes = fRowBytes;
rec->fColorTable = fCTable.get();
return true;
}
return false;
}
bool SkPixelRef::requestLock(const LockRequest& request, LockResult* result) {
SkASSERT(result);
if (request.fSize.isEmpty()) {
return false;
}
// until we support subsets, we have to check this...
if (request.fSize.width() != fInfo.width() || request.fSize.height() != fInfo.height()) {
return false;
}
result->fUnlockProc = nullptr;
result->fUnlockContext = nullptr;
result->fCTable = fCTable.get();
result->fPixels = fPixels;
result->fRowBytes = fRowBytes;
result->fSize.set(fInfo.width(), fInfo.height());
return true;
}
#endif
uint32_t SkPixelRef::getGenerationID() const {
uint32_t id = fTaggedGenID.load();
if (0 == id) {
uint32_t next = SkNextID::ImageID() | 1u;
if (fTaggedGenID.compare_exchange(&id, next)) {
id = next; // There was no race or we won the race. fTaggedGenID is next now.
} else {
// We lost a race to set fTaggedGenID. compare_exchange() filled id with the winner.
}
// We can't quite SkASSERT(this->genIDIsUnique()). It could be non-unique
// if we got here via the else path (pretty unlikely, but possible).
}
return id & ~1u; // Mask off bottom unique bit.
}
void SkPixelRef::addGenIDChangeListener(GenIDChangeListener* listener) {
if (nullptr == listener || !this->genIDIsUnique()) {
// No point in tracking this if we're not going to call it.
delete listener;
return;
}
*fGenIDChangeListeners.append() = listener;
}
// we need to be called *before* the genID gets changed or zerod
void SkPixelRef::callGenIDChangeListeners() {
// We don't invalidate ourselves if we think another SkPixelRef is sharing our genID.
if (this->genIDIsUnique()) {
for (int i = 0; i < fGenIDChangeListeners.count(); i++) {
fGenIDChangeListeners[i]->onChange();
}
// TODO: SkAtomic could add "old_value = atomic.xchg(new_value)" to make this clearer.
if (fAddedToCache.load()) {
SkNotifyBitmapGenIDIsStale(this->getGenerationID());
fAddedToCache.store(false);
}
}
// Listeners get at most one shot, so whether these triggered or not, blow them away.
fGenIDChangeListeners.deleteAll();
}
void SkPixelRef::notifyPixelsChanged() {
#ifdef SK_DEBUG
if (this->isImmutable()) {
SkDebugf("========== notifyPixelsChanged called on immutable pixelref");
}
#endif
this->callGenIDChangeListeners();
this->needsNewGenID();
this->onNotifyPixelsChanged();
}
void SkPixelRef::changeAlphaType(SkAlphaType at) {
*const_cast<SkImageInfo*>(&fInfo) = fInfo.makeAlphaType(at);
}
void SkPixelRef::setImmutable() {
fMutability = kImmutable;
}
void SkPixelRef::setImmutableWithID(uint32_t genID) {
/*
* We are forcing the genID to match an external value. The caller must ensure that this
* value does not conflict with other content.
*
* One use is to force this pixelref's id to match an SkImage's id
*/
fMutability = kImmutable;
fTaggedGenID.store(genID);
}
void SkPixelRef::setTemporarilyImmutable() {
SkASSERT(fMutability != kImmutable);
fMutability = kTemporarilyImmutable;
}
void SkPixelRef::restoreMutability() {
SkASSERT(fMutability != kImmutable);
fMutability = kMutable;
}
void SkPixelRef::onNotifyPixelsChanged() { }
size_t SkPixelRef::getAllocatedSizeInBytes() const {
return 0;
}
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