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//
// Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
#include "common/MemoryBuffer.h"
#include <algorithm>
#include <cstdlib>
#include "common/debug.h"
namespace angle
{
// MemoryBuffer implementation.
MemoryBuffer::MemoryBuffer() : mSize(0), mData(nullptr)
{
}
MemoryBuffer::~MemoryBuffer()
{
free(mData);
mData = nullptr;
}
bool MemoryBuffer::resize(size_t size)
{
if (size == 0)
{
free(mData);
mData = nullptr;
mSize = 0;
return true;
}
if (size == mSize)
{
return true;
}
// Only reallocate if the size has changed.
uint8_t *newMemory = reinterpret_cast<uint8_t *>(malloc(sizeof(uint8_t) * size));
if (newMemory == nullptr)
{
return false;
}
if (mData)
{
// Copy the intersection of the old data and the new data
std::copy(mData, mData + std::min(mSize, size), newMemory);
free(mData);
}
mData = newMemory;
mSize = size;
return true;
}
void MemoryBuffer::fill(uint8_t datum)
{
if (!empty())
{
std::fill(mData, mData + mSize, datum);
}
}
MemoryBuffer::MemoryBuffer(MemoryBuffer &&other) : MemoryBuffer()
{
*this = std::move(other);
}
MemoryBuffer &MemoryBuffer::operator=(MemoryBuffer &&other)
{
std::swap(mSize, other.mSize);
std::swap(mData, other.mData);
return *this;
}
// ScratchBuffer implementation.
ScratchBuffer::ScratchBuffer(uint32_t lifetime) : mLifetime(lifetime), mResetCounter(lifetime)
{
}
ScratchBuffer::~ScratchBuffer()
{
}
bool ScratchBuffer::get(size_t requestedSize, MemoryBuffer **memoryBufferOut)
{
return getImpl(requestedSize, memoryBufferOut, Optional<uint8_t>::Invalid());
}
bool ScratchBuffer::getInitialized(size_t requestedSize,
MemoryBuffer **memoryBufferOut,
uint8_t initValue)
{
return getImpl(requestedSize, memoryBufferOut, Optional<uint8_t>(initValue));
}
bool ScratchBuffer::getImpl(size_t requestedSize,
MemoryBuffer **memoryBufferOut,
Optional<uint8_t> initValue)
{
if (mScratchMemory.size() == requestedSize)
{
mResetCounter = mLifetime;
*memoryBufferOut = &mScratchMemory;
return true;
}
if (mScratchMemory.size() > requestedSize)
{
tick();
}
if (mResetCounter == 0 || mScratchMemory.size() < requestedSize)
{
mScratchMemory.resize(0);
if (!mScratchMemory.resize(requestedSize))
{
return false;
}
mResetCounter = mLifetime;
if (initValue.valid())
{
mScratchMemory.fill(initValue.value());
}
}
ASSERT(mScratchMemory.size() >= requestedSize);
*memoryBufferOut = &mScratchMemory;
return true;
}
void ScratchBuffer::tick()
{
if (mResetCounter > 0)
{
--mResetCounter;
}
}
void ScratchBuffer::clear()
{
mResetCounter = mLifetime;
mScratchMemory.resize(0);
}
} // namespace angle
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