text: //===============================================================================
  // Copyright (c) 2007-2016  Advanced Micro Devices, Inc. All rights reserved.
  // Copyright (c) 2004-2006 ATI Technologies Inc.
  //===============================================================================
  //
  // 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.
  //
  //
  //  File Name:   CodecBuffer_RG8.cpp
  //  Description: implementation of the CCodecBuffer_RG8 class
  //
  //////////////////////////////////////////////////////////////////////////////
  
  #include "common.h"
  #include "codecbuffer_rg8.h"
  
  //////////////////////////////////////////////////////////////////////////////
  // Construction/Destruction
  //////////////////////////////////////////////////////////////////////////////
  
  const int nChannelCount = 2;
  const int nPixelSize = nChannelCount * sizeof(CMP_BYTE);
  
  CCodecBuffer_RG8::CCodecBuffer_RG8(
      CMP_BYTE nBlockWidth, CMP_BYTE nBlockHeight, CMP_BYTE nBlockDepth,
      CMP_DWORD dwWidth, CMP_DWORD dwHeight, CMP_DWORD dwPitch, CMP_BYTE* pData,CMP_DWORD dwDataSize)
      : CCodecBuffer(nBlockWidth, nBlockHeight, nBlockDepth, dwWidth, dwHeight, dwPitch, pData,dwDataSize) {
      assert((m_dwPitch == 0) || (m_dwPitch >= GetWidth() * nPixelSize));
      if(m_dwPitch <= GetWidth() * nPixelSize)
          m_dwPitch = GetWidth() * nPixelSize;
  
      if(m_pData == NULL) {
          CMP_DWORD dwSize = m_dwPitch * GetHeight();
          m_pData = (CMP_BYTE*) malloc(dwSize);
      }
  }
  
  CCodecBuffer_RG8::~CCodecBuffer_RG8() {
  
  }
  
  void CCodecBuffer_RG8::Copy(CCodecBuffer& srcBuffer) {
      if(GetWidth() != srcBuffer.GetWidth() || GetHeight() != srcBuffer.GetHeight())
          return;
  
      const CMP_DWORD dwBlocksX = ((GetWidth() + 3) >> 2);
      const CMP_DWORD dwBlocksY = ((GetHeight() + 3) >> 2);
  
      for(CMP_DWORD j = 0; j < dwBlocksY; j++) {
          for(CMP_DWORD i = 0; i < dwBlocksX; i++) {
              CMP_BYTE block[BLOCK_SIZE_4X4X4];
              srcBuffer.ReadBlockRGBA(i*4, j*4, 4, 4, block);
              WriteBlockRGBA(i*4, j*4, 4, 4, block);
          }
      }
  }
  
  bool CCodecBuffer_RG8::ReadBlock(CMP_DWORD x, CMP_DWORD y, CMP_BYTE w, CMP_BYTE h, CMP_BYTE block[], CMP_DWORD dwChannelOffset) {
      assert(x < GetWidth());
      assert(y < GetHeight());
  
      if(x >= GetWidth() || y >= GetHeight())
          return false;
  
      CMP_DWORD dwWidth = cmp_minT(w, (GetWidth() - x));
  
      CMP_DWORD i, j;
      for(j = 0; j < h && (y + j) < GetHeight(); j++) {
          CMP_WORD* pData = (CMP_WORD*) (GetData() + ((y + j) * m_dwPitch) + (x * nPixelSize));
          for(i = 0; i < dwWidth; i++)
              block[(j * w) + i] = static_cast<CMP_BYTE>(((*pData++) >> dwChannelOffset) & BYTE_MASK);
  
          // Pad line with previous values if necessary
          if(i < w)
              PadLine(i, w, 1, &block[j * w]);
      }
  
      // Pad block with previous values if necessary
      if(j < h)
          PadBlock(j, w, h, 1, block);
  
      return true;
  }
  
  bool CCodecBuffer_RG8::WriteBlock(CMP_DWORD x, CMP_DWORD y, CMP_BYTE w, CMP_BYTE h, CMP_BYTE block[], CMP_DWORD dwChannelOffset) {
      assert(x < GetWidth());
      assert(y < GetHeight());
  
      if(x >= GetWidth() || y >= GetHeight())
          return false;
  
      CMP_DWORD dwChannelMask = ~((CMP_DWORD) BYTE_MASK << dwChannelOffset);
      CMP_DWORD dwWidth       = cmp_minT(w, (GetWidth() - x));
  
      for(CMP_DWORD j = 0; j < h && (y + j) < GetHeight(); j++) {
          CMP_WORD* pData = (CMP_WORD*) (GetData() + ((y + j) * m_dwPitch) + (x * nPixelSize));
          for(CMP_DWORD i = 0; i < dwWidth; i++) {
              *pData = (CMP_WORD) ((*pData & dwChannelMask) | (((CMP_WORD) block[(j * w) + i]) << dwChannelOffset));
              pData++;
          }
      }
      return true;
  }
  
  #define RG8_CHANNEL_R 1
  #define RG8_CHANNEL_G 0
  
  #define RG8_OFFSET_R (RG8_CHANNEL_R * 8)
  #define RG8_OFFSET_G (RG8_CHANNEL_G * 8)
  
  bool CCodecBuffer_RG8::ReadBlockA(CMP_DWORD x, CMP_DWORD y, CMP_BYTE w, CMP_BYTE h, CMP_BYTE block[]) {
      assert(x < GetWidth());
      assert(y < GetHeight());
  
      if(x >= GetWidth() || y >= GetHeight())
          return false;
  
      memset(block, 0, w*h*nPixelSize);
  
      return true;
  }
  
  bool CCodecBuffer_RG8::ReadBlockR(CMP_DWORD x, CMP_DWORD y, CMP_BYTE w, CMP_BYTE h, CMP_BYTE block[]) {
      return ReadBlock(x, y, w, h, block, RG8_OFFSET_R);
  }
  
  bool CCodecBuffer_RG8::ReadBlockG(CMP_DWORD x, CMP_DWORD y, CMP_BYTE w, CMP_BYTE h, CMP_BYTE block[]) {
      return ReadBlock(x, y, w, h, block, RG8_OFFSET_G);
  }
  
  bool CCodecBuffer_RG8::ReadBlockB(CMP_DWORD x, CMP_DWORD y, CMP_BYTE w, CMP_BYTE h, CMP_BYTE block[]) {
      assert(x < GetWidth());
      assert(y < GetHeight());
  
      if(x >= GetWidth() || y >= GetHeight())
          return false;
  
      memset(block, 0, w*h*nPixelSize);
  
      return true;
  }
  
  bool CCodecBuffer_RG8::WriteBlockA(CMP_DWORD x, CMP_DWORD y, CMP_BYTE /*w*/, CMP_BYTE /*h*/, CMP_BYTE /*block*/[]) {
      assert(x < GetWidth());
      assert(y < GetHeight());
  
      if(x >= GetWidth() || y >= GetHeight())
          return false;
  
      return true;
  }
  
  bool CCodecBuffer_RG8::WriteBlockR(CMP_DWORD x, CMP_DWORD y, CMP_BYTE w, CMP_BYTE h, CMP_BYTE block[]) {
      return WriteBlock(x, y, w, h, block, RG8_OFFSET_R);
  }
  
  bool CCodecBuffer_RG8::WriteBlockG(CMP_DWORD x, CMP_DWORD y, CMP_BYTE w, CMP_BYTE h, CMP_BYTE block[]) {
      return WriteBlock(x, y, w, h, block, RG8_OFFSET_G);
  }
  
  bool CCodecBuffer_RG8::WriteBlockB(CMP_DWORD x, CMP_DWORD y, CMP_BYTE /*w*/, CMP_BYTE /*h*/, CMP_BYTE /*block*/[]) {
      assert(x < GetWidth());
      assert(y < GetHeight());
  
      if(x >= GetWidth() || y >= GetHeight())
          return false;
  
      return true;
  }
  
  #define GET_PIXEL(i, j) &block[(((j * w) + i) * 4)]
  bool CCodecBuffer_RG8::ReadBlockRGBA(CMP_DWORD x, CMP_DWORD y, CMP_BYTE w, CMP_BYTE h, CMP_BYTE block[]) {
      assert(x < GetWidth());
      assert(y < GetHeight());
      assert(x % w == 0);
      assert(y % h == 0);
  
      if(x >= GetWidth() || y >= GetHeight())
          return false;
  
      CMP_DWORD dwWidth = cmp_minT(w, (GetWidth() - x));
  
      CMP_DWORD i, j;
      for(j = 0; j < h && (y + j) < GetHeight(); j++) {
          CMP_BYTE* pData = (CMP_BYTE*) (GetData() + ((y + j) * m_dwPitch) + (x * nPixelSize));
          for(i = 0; i < dwWidth; i++) {
              CMP_BYTE* pDest = GET_PIXEL(i, j);
              *pDest++ = 0;
              memcpy(pDest, pData, nPixelSize);
              pData += nChannelCount;
              pDest += 2;
              *pDest++ = 0xff;
          }
  
          // Pad block with previous values if necessary
          if(i < w)
              PadLine(i, w, 4, &block[j * w * 4]);
      }
  
      // Pad block with previous values if necessary
      if(j < h)
          PadBlock(j, w, h, 4, block);
  
      return true;
  }
  
  bool CCodecBuffer_RG8::WriteBlockRGBA(CMP_DWORD x, CMP_DWORD y, CMP_BYTE w, CMP_BYTE h, CMP_BYTE block[]) {
      assert(x < GetWidth());
      assert(y < GetHeight());
      assert(x % 4 == 0);
      assert(y % 4 == 0);
  
      if(x >= GetWidth() || y >= GetHeight())
          return false;
  
      CMP_DWORD dwWidth = cmp_minT(w, (GetWidth() - x));
  
      for(CMP_DWORD j = 0; j < h && (y + j) < GetHeight(); j++) {
          CMP_BYTE* pData = (CMP_BYTE*) (GetData() + ((y + j) * m_dwPitch) + (x * nPixelSize));
          for(CMP_DWORD i = 0; i < dwWidth; i++) {
              memcpy(pData, GET_PIXEL(i, j)+RG8_CHANNEL_G, nPixelSize);
              pData += nChannelCount;
          }
      }
      return true;
  }
  
  
  