kc3-lang/angle/src/common/MemoryBuffer.cpp

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• Author : Jamie Madill
  Date : 2015-02-09 10:31:23
  Hash : 74ba76c4
  Message : Move rx::MemoryBuffer to common library. This class is not D3D-specific so can be shared among other back-ends, or other parts of the ANGLE codebase. Change-Id: Ie00760eb5dae4db52e465ee7a2f97789bae8c0b0 Reviewed-on: https://chromium-review.googlesource.com/246500 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>

• src/common/MemoryBuffer.cpp

• //
  // 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 rx
  {
  
  MemoryBuffer::MemoryBuffer()
      : mSize(0),
        mData(NULL)
  {
  }
  
  MemoryBuffer::~MemoryBuffer()
  {
      free(mData);
      mData = NULL;
  }
  
  bool MemoryBuffer::resize(size_t size)
  {
      if (size == 0)
      {
          free(mData);
          mData = NULL;
          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 == NULL)
      {
          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;
  }
  
  size_t MemoryBuffer::size() const
  {
      return mSize;
  }
  
  const uint8_t *MemoryBuffer::data() const
  {
      return mData;
  }
  
  uint8_t *MemoryBuffer::data()
  {
      ASSERT(mData);
      return mData;
  }
  
  }