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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkRegionPriv_DEFINED
#define SkRegionPriv_DEFINED
#include "SkRegion.h"
#include "SkThread.h"
#define assert_sentinel(value, isSentinel) \
SkASSERT(((value) == SkRegion::kRunTypeSentinel) == isSentinel)
//SkDEBUGCODE(extern int32_t gRgnAllocCounter;)
struct SkRegion::RunHead {
int32_t fRefCnt;
int32_t fRunCount;
static RunHead* Alloc(int count) {
//SkDEBUGCODE(sk_atomic_inc(&gRgnAllocCounter);)
//SkDEBUGF(("************** gRgnAllocCounter::alloc %d\n", gRgnAllocCounter));
SkASSERT(count >= SkRegion::kRectRegionRuns);
RunHead* head = (RunHead*)sk_malloc_throw(sizeof(RunHead) + count * sizeof(RunType));
head->fRefCnt = 1;
head->fRunCount = count;
return head;
}
bool isComplex() const {
return this != SkRegion_gEmptyRunHeadPtr && this != SkRegion_gRectRunHeadPtr;
}
SkRegion::RunType* writable_runs() {
SkASSERT(this->isComplex());
SkASSERT(fRefCnt == 1);
return (SkRegion::RunType*)(this + 1);
}
const SkRegion::RunType* readonly_runs() const {
SkASSERT(this->isComplex());
return (const SkRegion::RunType*)(this + 1);
}
RunHead* ensureWritable() {
SkASSERT(this->isComplex());
RunHead* writable = this;
if (fRefCnt > 1) {
// We need to alloc & copy the current region before we call
// sk_atomic_dec because it could be freed in the meantime,
// otherwise.
writable = Alloc(fRunCount);
memcpy(writable->writable_runs(), this->readonly_runs(),
fRunCount * sizeof(RunType));
// fRefCount might have changed since we last checked.
// If we own the last reference at this point, we need to
// free the memory.
if (sk_atomic_dec(&fRefCnt) == 1) {
sk_free(this);
}
}
return writable;
}
};
#endif
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