void UnfilterRowPaeth(int nbytes) { int i, j, x, y; for (j = 1 - ImgInfo.BytesPixel, i = 1; i <= nbytes; i++, j++) { x = (j > 0) ? rowb[j] : (byte)0; y = (j > 0) ? rowbprev[j] : (byte)0; rowb[i] = (byte)(rowbfilter[i] + PngHelperInternal.FilterPaethPredictor(x, rowbprev[i], y)); } }
void FilterRowPaeth() { int i, j; int bytesPerRow = ImgInfo.BytesPerRow; int bytesPixel = ImgInfo.BytesPixel; for (j = 1 - bytesPixel, i = 1; i <= bytesPerRow; i++, j++) { rowbfilter[i] = (byte)( rowb[i] - PngHelperInternal.FilterPaethPredictor( a: j > 0 ? rowb[j] : (byte)0, b: rowbprev[i], c: j > 0 ? rowbprev[j] : (byte)0 ) ); } }