UNROLL1 179 libavcodec/pngdec.c if(bpp == 1) UNROLL1(1, op)\ UNROLL1 180 libavcodec/pngdec.c else if(bpp == 2) UNROLL1(2, op)\ UNROLL1 181 libavcodec/pngdec.c else if(bpp == 3) UNROLL1(3, op)\ UNROLL1 182 libavcodec/pngdec.c else if(bpp == 4) UNROLL1(4, op)\