blind-premultiply.c (1406B)
1 /* See LICENSE file for copyright and license details. */ 2 #ifndef TYPE 3 #include "common.h" 4 5 USAGE("[-xyz]") 6 7 static int skip_x = 0; 8 static int skip_y = 0; 9 static int skip_z = 0; 10 11 #define FILE "blind-premultiply.c" 12 #include "define-functions.h" 13 14 int 15 main(int argc, char *argv[]) 16 { 17 struct stream stream; 18 void (*process)(struct stream *stream); 19 20 ARGBEGIN { 21 case 'x': 22 skip_x = 1; 23 break; 24 case 'y': 25 skip_y = 1; 26 break; 27 case 'z': 28 skip_z = 1; 29 break; 30 default: 31 usage(); 32 } ARGEND; 33 34 if (argc) 35 usage(); 36 37 eopen_stream(&stream, NULL); 38 39 SELECT_PROCESS_FUNCTION(&stream); 40 CHECK_CHANS(&stream, == 3, == stream.luma_chan); 41 CHECK_N_CHAN(&stream, 4, 4); 42 43 fprint_stream_head(stdout, &stream); 44 efflush(stdout, "<stdout>"); 45 process(&stream); 46 return 0; 47 } 48 49 #else 50 51 static void 52 PROCESS(struct stream *stream) 53 { 54 size_t i, n; 55 TYPE a; 56 do { 57 n = stream->ptr / stream->pixel_size; 58 for (i = 0; i < n; i++) { 59 a = ((TYPE *)(stream->buf))[4 * i + 3]; 60 if (!skip_x) 61 ((TYPE *)(stream->buf))[4 * i + 0] *= a; 62 if (!skip_y) 63 ((TYPE *)(stream->buf))[4 * i + 1] *= a; 64 if (!skip_z) 65 ((TYPE *)(stream->buf))[4 * i + 2] *= a; 66 } 67 n *= stream->pixel_size; 68 ewriteall(STDOUT_FILENO, stream->buf, n, "<stdout>"); 69 memmove(stream->buf, stream->buf + n, stream->ptr -= n); 70 } while (eread_stream(stream, SIZE_MAX)); 71 if (stream->ptr) 72 eprintf("%s: incomplete frame\n", stream->file); 73 } 74 75 #endif