text: /*
  * Copyright (c) 2014 Microsoft Mobile
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
  
  #include "pch.h"
  #include "CustomEffectCxBuffer.h"
  
  using namespace Lumia::Imaging::Extras::Detail;
  
  static uint32* GetBufferData(Windows::Storage::Streams::IBufferByteAccess* bufferByteAccess);
  static Microsoft::WRL::ComPtr<Windows::Storage::Streams::IBufferByteAccess> GetBufferByteAccess(IInspectable* buffer);
  
  CustomEffectCxBuffer::CustomEffectCxBuffer() :
  	m_bufferData(nullptr)
  {
  }
  
  void CustomEffectCxBuffer::Clear()
  {
  	m_bufferData = nullptr;
  	m_bufferByteAccess = nullptr;
  	m_buffer = nullptr;
  }
  
  void CustomEffectCxBuffer::EnsureCapacity(uint32 requiredLength)
  {
  	if(!m_buffer || requiredLength > m_buffer->Capacity)
  	{
  		m_buffer = ref new Windows::Storage::Streams::Buffer(requiredLength);
  		m_bufferByteAccess = GetBufferByteAccess(reinterpret_cast<IInspectable*>(m_buffer));
  		m_bufferData = GetBufferData(m_bufferByteAccess.Get());
  	}
  
  	m_buffer->Length = requiredLength;
  }
  
  static uint32* GetBufferData(Windows::Storage::Streams::IBufferByteAccess* bufferByteAccess)
  {
  	uint32* bufferData = nullptr;
  
  	__abi_ThrowIfFailed(
  		bufferByteAccess->Buffer(reinterpret_cast<byte**>(&bufferData))
  		);
  
  	return bufferData;
  }
  
  static Microsoft::WRL::ComPtr<Windows::Storage::Streams::IBufferByteAccess> GetBufferByteAccess(IInspectable* buffer)
  {
  	Microsoft::WRL::ComPtr<Windows::Storage::Streams::IBufferByteAccess> bufferByteAccess;
  
  	__abi_ThrowIfFailed(
  		buffer->QueryInterface(IID_PPV_ARGS(&bufferByteAccess))
  		);
  
  	return bufferByteAccess;
  }
  
  