static void time_read_64_scanlines_at_a_time () { ImageInput *in = ImageInput::open (input_filename.c_str()); ASSERT (in); const ImageSpec &spec (in->spec()); size_t pixelsize = spec.nchannels * sizeof(float); imagesize_t scanlinesize = spec.width * pixelsize; for (int y = 0; y < spec.height; y += 64) { in->read_scanlines (y+spec.y, std::min(y+spec.y+64, spec.y+spec.height), 0, TypeDesc::TypeFloat, &buffer[scanlinesize*y]); } in->close (); delete in; }