WebP.java 文件源码

private static byte[] extractDirectRGBInt( int aWidth, int aHeight, DirectColorModel aColorModel, SinglePixelPackedSampleModel aSampleModel, DataBufferInt aDataBuffer ) {
  byte[] out = new byte[ aWidth * aHeight * 3 ];

  int rMask = aColorModel.getRedMask();
  int gMask = aColorModel.getGreenMask();
  int bMask = aColorModel.getBlueMask();
  int rShift = getShift( rMask );
  int gShift = getShift( gMask );
  int bShift = getShift( bMask );
  int[] bank = aDataBuffer.getBankData()[ 0 ];
  int scanlineStride = aSampleModel.getScanlineStride();
  int scanIx = 0;
  for ( int b = 0, y = 0; y < aHeight; y++ ) {
    int pixIx = scanIx;
    for ( int x = 0; x < aWidth; x++, b += 3 ) {
      int pixel = bank[ pixIx++ ];
      out[ b ] = ( byte ) ( ( pixel & rMask ) >>> rShift );
      out[ b + 1 ] = ( byte ) ( ( pixel & gMask ) >>> gShift );
      out[ b + 2 ] = ( byte ) ( ( pixel & bMask ) >>> bShift );
    }
    scanIx += scanlineStride;
  }
  return out;
}