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

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• Hash : 9f9b1d2d
  Author :
  Date : 2017-03-06T18:25:22
  

  Make ScratchBuffer its own type.
  
  This helper tool in Renderer11 can be useful in other back-ends,
  or even in the front end.
  
  BUG=angleproject:1635
  
  Change-Id: I18ec19a891a9bdfa7b80dea1b8e308abf206906b
  Reviewed-on: https://chromium-review.googlesource.com/450919
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• 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 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;
  }
  
  size_t MemoryBuffer::size() const
  {
      return mSize;
  }
  
  const uint8_t *MemoryBuffer::data() const
  {
      return mData;
  }
  
  uint8_t *MemoryBuffer::data()
  {
      ASSERT(mData);
      return mData;
  }
  
  // ScratchBuffer implementation.
  
  ScratchBuffer::ScratchBuffer(uint32_t lifetime) : mLifetime(lifetime), mResetCounter(lifetime)
  {
  }
  
  ScratchBuffer::~ScratchBuffer()
  {
  }
  
  bool ScratchBuffer::get(size_t requestedSize, MemoryBuffer **memoryBufferOut)
  {
      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;
      }
  
      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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