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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 "SkPixelRef.h"
#include "SkFlattenable.h"
#include "SkThread.h"
// must be a power-of-2. undef to just use 1 mutex
#define PIXELREF_MUTEX_RING_COUNT 32
#ifdef PIXELREF_MUTEX_RING_COUNT
static int32_t gPixelRefMutexRingIndex;
static SK_DECLARE_MUTEX_ARRAY(gPixelRefMutexRing, PIXELREF_MUTEX_RING_COUNT);
#else
SK_DECLARE_STATIC_MUTEX(gPixelRefMutex);
#endif
SkBaseMutex* get_default_mutex() {
#ifdef 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)];
#else
return &gPixelRefMutex;
#endif
}
///////////////////////////////////////////////////////////////////////////////
extern 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) : fPreLocked(false) {
this->setMutex(mutex);
fPixels = NULL;
fColorTable = NULL; // we do not track ownership of this
fLockCount = 0;
fGenerationID = 0; // signal to rebuild
fIsImmutable = false;
fPreLocked = false;
}
SkPixelRef::SkPixelRef(SkFlattenableReadBuffer& buffer, SkBaseMutex* mutex) {
this->setMutex(mutex);
fPixels = NULL;
fColorTable = NULL; // we do not track ownership of this
fLockCount = 0;
fGenerationID = 0; // signal to rebuild
fIsImmutable = buffer.readBool();
fPreLocked = false;
}
void SkPixelRef::setPreLocked(void* pixels, SkColorTable* ctable) {
// only call me in your constructor, otherwise fLockCount tracking can get
// out of sync.
fPixels = pixels;
fColorTable = ctable;
fLockCount = SKPIXELREF_PRELOCKED_LOCKCOUNT;
fPreLocked = true;
}
void SkPixelRef::flatten(SkFlattenableWriteBuffer& buffer) const {
buffer.writeBool(fIsImmutable);
}
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;
}
uint32_t SkPixelRef::getGenerationID() const {
if (0 == fGenerationID) {
fGenerationID = SkNextPixelRefGenerationID();
}
return fGenerationID;
}
void SkPixelRef::notifyPixelsChanged() {
#ifdef SK_DEBUG
if (fIsImmutable) {
SkDebugf("========== notifyPixelsChanged called on immutable pixelref");
}
#endif
// this signals us to recompute this next time around
fGenerationID = 0;
}
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;
}
///////////////////////////////////////////////////////////////////////////////
#define MAX_PAIR_COUNT 16
struct Pair {
const char* fName;
SkPixelRef::Factory fFactory;
};
static int gCount;
static Pair gPairs[MAX_PAIR_COUNT];
void SkPixelRef::Register(const char name[], Factory factory) {
SkASSERT(name);
SkASSERT(factory);
static bool gOnce;
if (!gOnce) {
gCount = 0;
gOnce = true;
}
SkASSERT(gCount < MAX_PAIR_COUNT);
gPairs[gCount].fName = name;
gPairs[gCount].fFactory = factory;
gCount += 1;
}
#if !SK_ALLOW_STATIC_GLOBAL_INITIALIZERS && defined(SK_DEBUG)
static void report_no_entries(const char* functionName) {
if (!gCount) {
SkDebugf("%s has no registered name/factory pairs."
" Call SkGraphics::Init() at process initialization time.",
functionName);
}
}
#endif
SkPixelRef::Factory SkPixelRef::NameToFactory(const char name[]) {
#if !SK_ALLOW_STATIC_GLOBAL_INITIALIZERS && defined(SK_DEBUG)
report_no_entries(__FUNCTION__);
#endif
const Pair* pairs = gPairs;
for (int i = gCount - 1; i >= 0; --i) {
if (strcmp(pairs[i].fName, name) == 0) {
return pairs[i].fFactory;
}
}
return NULL;
}
const char* SkPixelRef::FactoryToName(Factory fact) {
#if !SK_ALLOW_STATIC_GLOBAL_INITIALIZERS && defined(SK_DEBUG)
report_no_entries(__FUNCTION__);
#endif
const Pair* pairs = gPairs;
for (int i = gCount - 1; i >= 0; --i) {
if (pairs[i].fFactory == fact) {
return pairs[i].fName;
}
}
return NULL;
}
///////////////////////////////////////////////////////////////////////////////
#ifdef SK_BUILD_FOR_ANDROID
void SkPixelRef::globalRef(void* data) {
this->ref();
}
void SkPixelRef::globalUnref() {
this->unref();
}
#endif
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