skia2/include/core/SkTDArray.h

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/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SkTDArray_DEFINED
#define SkTDArray_DEFINED
#include "SkTypes.h"
template <typename T> class SK_API SkTDArray {
public:
SkTDArray() {
fReserve = fCount = 0;
fArray = NULL;
#ifdef SK_DEBUG
fData = NULL;
#endif
}
SkTDArray(const T src[], size_t count) {
SkASSERT(src || count == 0);
fReserve = fCount = 0;
fArray = NULL;
#ifdef SK_DEBUG
fData = NULL;
#endif
if (count) {
fArray = (T*)sk_malloc_throw(count * sizeof(T));
#ifdef SK_DEBUG
fData = (ArrayT*)fArray;
#endif
memcpy(fArray, src, sizeof(T) * count);
fReserve = fCount = count;
}
}
SkTDArray(const SkTDArray<T>& src) {
fReserve = fCount = 0;
fArray = NULL;
#ifdef SK_DEBUG
fData = NULL;
#endif
SkTDArray<T> tmp(src.fArray, src.fCount);
this->swap(tmp);
}
~SkTDArray() {
sk_free(fArray);
}
SkTDArray<T>& operator=(const SkTDArray<T>& src) {
if (this != &src) {
if (src.fCount > fReserve) {
SkTDArray<T> tmp(src.fArray, src.fCount);
this->swap(tmp);
} else {
memcpy(fArray, src.fArray, sizeof(T) * src.fCount);
fCount = src.fCount;
}
}
return *this;
}
friend int operator==(const SkTDArray<T>& a, const SkTDArray<T>& b) {
return a.fCount == b.fCount &&
(a.fCount == 0 ||
!memcmp(a.fArray, b.fArray, a.fCount * sizeof(T)));
}
void swap(SkTDArray<T>& other) {
SkTSwap(fArray, other.fArray);
#ifdef SK_DEBUG
SkTSwap(fData, other.fData);
#endif
SkTSwap(fReserve, other.fReserve);
SkTSwap(fCount, other.fCount);
}
/** Return a ptr to the array of data, to be freed with sk_free. This also
resets the SkTDArray to be empty.
*/
T* detach() {
T* array = fArray;
fArray = NULL;
fReserve = fCount = 0;
SkDEBUGCODE(fData = NULL;)
return array;
}
bool isEmpty() const { return fCount == 0; }
int count() const { return fCount; }
T* begin() const { return fArray; }
T* end() const { return fArray ? fArray + fCount : NULL; }
T& operator[](int index) const {
SkASSERT((unsigned)index < fCount);
return fArray[index];
}
void reset() {
if (fArray) {
sk_free(fArray);
fArray = NULL;
#ifdef SK_DEBUG
fData = NULL;
#endif
fReserve = fCount = 0;
} else {
SkASSERT(fReserve == 0 && fCount == 0);
}
}
void rewind() {
// same as setCount(0)
fCount = 0;
}
void setCount(size_t count) {
if (count > fReserve) {
this->growBy(count - fCount);
} else {
fCount = count;
}
}
void setReserve(size_t reserve) {
if (reserve > fReserve) {
SkASSERT(reserve > fCount);
size_t count = fCount;
this->growBy(reserve - fCount);
fCount = count;
}
}
T* prepend() {
this->growBy(1);
memmove(fArray + 1, fArray, (fCount - 1) * sizeof(T));
return fArray;
}
T* append() {
return this->append(1, NULL);
}
T* append(size_t count, const T* src = NULL) {
unsigned oldCount = fCount;
if (count) {
SkASSERT(src == NULL || fArray == NULL ||
src + count <= fArray || fArray + oldCount <= src);
this->growBy(count);
if (src) {
memcpy(fArray + oldCount, src, sizeof(T) * count);
}
}
return fArray + oldCount;
}
T* appendClear() {
T* result = this->append();
*result = 0;
return result;
}
T* insert(size_t index) {
return this->insert(index, 1, NULL);
}
T* insert(size_t index, size_t count, const T* src = NULL) {
SkASSERT(count);
SkASSERT(index <= fCount);
int oldCount = fCount;
this->growBy(count);
T* dst = fArray + index;
memmove(dst + count, dst, sizeof(T) * (oldCount - index));
if (src) {
memcpy(dst, src, sizeof(T) * count);
}
return dst;
}
void remove(size_t index, size_t count = 1) {
SkASSERT(index + count <= fCount);
fCount = fCount - count;
memmove(fArray + index, fArray + index + count, sizeof(T) * (fCount - index));
}
void removeShuffle(size_t index) {
SkASSERT(index < fCount);
unsigned newCount = fCount - 1;
fCount = newCount;
if (index != newCount) {
memcpy(fArray + index, fArray + newCount, sizeof(T));
}
}
int find(const T& elem) const {
const T* iter = fArray;
const T* stop = fArray + fCount;
for (; iter < stop; iter++) {
if (*iter == elem) {
return (int) (iter - fArray);
}
}
return -1;
}
int rfind(const T& elem) const {
const T* iter = fArray + fCount;
const T* stop = fArray;
while (iter > stop) {
if (*--iter == elem) {
return iter - stop;
}
}
return -1;
}
// routines to treat the array like a stack
T* push() { return this->append(); }
void push(const T& elem) { *this->append() = elem; }
const T& top() const { return (*this)[fCount - 1]; }
T& top() { return (*this)[fCount - 1]; }
void pop(T* elem) { if (elem) *elem = (*this)[fCount - 1]; --fCount; }
void pop() { --fCount; }
void deleteAll() {
T* iter = fArray;
T* stop = fArray + fCount;
while (iter < stop) {
delete (*iter);
iter += 1;
}
this->reset();
}
void freeAll() {
T* iter = fArray;
T* stop = fArray + fCount;
while (iter < stop) {
sk_free(*iter);
iter += 1;
}
this->reset();
}
void unrefAll() {
T* iter = fArray;
T* stop = fArray + fCount;
while (iter < stop) {
(*iter)->unref();
iter += 1;
}
this->reset();
}
void safeUnrefAll() {
T* iter = fArray;
T* stop = fArray + fCount;
while (iter < stop) {
SkSafeUnref(*iter);
iter += 1;
}
this->reset();
}
#ifdef SK_DEBUG
void validate() const {
SkASSERT((fReserve == 0 && fArray == NULL) ||
(fReserve > 0 && fArray != NULL));
SkASSERT(fCount <= fReserve);
SkASSERT(fData == (ArrayT*)fArray);
}
#endif
private:
#ifdef SK_DEBUG
enum {
kDebugArraySize = 16
};
typedef T ArrayT[kDebugArraySize];
ArrayT* fData;
#endif
T* fArray;
size_t fReserve, fCount;
void growBy(size_t extra) {
SkASSERT(extra);
if (fCount + extra > fReserve) {
size_t size = fCount + extra + 4;
size += size >> 2;
fArray = (T*)sk_realloc_throw(fArray, size * sizeof(T));
#ifdef SK_DEBUG
fData = (ArrayT*)fArray;
#endif
fReserve = size;
}
fCount += extra;
}
};
#endif