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

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• Hash : 9d737966
  Author :
  Date : 2019-08-14T12:25:12
  

  Standardize copyright notices to project style
  
  For all "ANGLE Project" copyrights, standardize to the format specified
  by the style guide. Changes:
  - "Copyright (c)" and "Copyright(c)" changed to just "Copyright".
  - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1").
  - Fixed a small number of files that had no copyright date using the
    initial commit year from the version control history.
  - Fixed one instance of copyright being "The ANGLE Project" rather than
    "The ANGLE Project Authors"
  
  These changes are applied both to the copyright of source file, and
  where applicable to copyright statements that are generated by
  templates.
  
  BUG=angleproject:3811
  
  Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/common/MemoryBuffer.cpp

• //
  // Copyright 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()
  {
      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 = static_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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