diff options
Diffstat (limited to 'editor/specialty/ppmtv.c')
| -rw-r--r-- | editor/specialty/ppmtv.c | 167 |
1 files changed, 83 insertions, 84 deletions
diff --git a/editor/specialty/ppmtv.c b/editor/specialty/ppmtv.c index da25102a..7e540e34 100644 --- a/editor/specialty/ppmtv.c +++ b/editor/specialty/ppmtv.c @@ -1,4 +1,3 @@ - /*********************************************************************/ /* ppmtv - make a 'look-alike ntsc' picture from a PPM file */ /* Frank Neumann, October 1993 */ @@ -18,88 +17,88 @@ int main(argc, argv) int argc; char *argv[]; { - FILE* ifp; - int argn, rows, cols, format, i = 0, j = 0; - pixel *srcrow, *destrow; - pixel *pP = NULL, *pP2 = NULL; - pixval maxval; - double dimfactor; - long longfactor; - const char * const usage = "dimfactor [ppmfile]\n dimfactor: 0.0 = total blackness, 1.0 = original picture\n"; - - /* parse in 'default' parameters */ - ppm_init(&argc, argv); - - argn = 1; - - /* parse in dim factor */ - if (argn == argc) - pm_usage(usage); - if (sscanf(argv[argn], "%lf", &dimfactor) != 1) - pm_usage(usage); - if (dimfactor < 0.0 || dimfactor > 1.0) - pm_error("dim factor must be in the range from 0.0 to 1.0 "); - ++argn; - - /* parse in filename (if present, stdin otherwise) */ - if (argn != argc) - { - ifp = pm_openr(argv[argn]); - ++argn; - } - else - ifp = stdin; - - if (argn != argc) - pm_usage(usage); - - /* read first data from file */ - ppm_readppminit(ifp, &cols, &rows, &maxval, &format); - - /* no error checking required here, ppmlib does it all for us */ - srcrow = ppm_allocrow(cols); - - longfactor = (long)(dimfactor * 65536); - - /* allocate a row of pixel data for the new pixels */ - destrow = ppm_allocrow(cols); - - ppm_writeppminit(stdout, cols, rows, maxval, 0); - - /** now do the ntsc'ing (actually very similar to ppmdim) **/ - for (i = 0; i < rows; i++) - { - ppm_readppmrow(ifp, srcrow, cols, maxval, format); - - pP = srcrow; - pP2 = destrow; - - for (j = 0; j < cols; j++) - { - /* every alternating row is left in unchanged condition */ - if (i & 1) - { - PPM_ASSIGN(*pP2, PPM_GETR(*pP), PPM_GETG(*pP), PPM_GETB(*pP)); - } - /* and the other lines are dimmed to the specified factor */ - else - { - PPM_ASSIGN(*pP2, (PPM_GETR(*pP) * longfactor) >> 16, - (PPM_GETG(*pP) * longfactor) >> 16, - (PPM_GETB(*pP) * longfactor) >> 16); - } - pP++; - pP2++; - } - - /* write out one line of graphic data */ - ppm_writeppmrow(stdout, destrow, cols, maxval, 0); - } - - pm_close(ifp); - ppm_freerow(srcrow); - ppm_freerow(destrow); - - exit(0); + FILE* ifp; + int argn, rows, cols, format, i = 0, j = 0; + pixel *srcrow, *destrow; + pixel *pP = NULL, *pP2 = NULL; + pixval maxval; + double dimfactor; + long longfactor; + const char * const usage = "dimfactor [ppmfile]\n dimfactor: 0.0 = total blackness, 1.0 = original picture\n"; + + /* parse in 'default' parameters */ + ppm_init(&argc, argv); + + argn = 1; + + /* parse in dim factor */ + if (argn == argc) + pm_usage(usage); + if (sscanf(argv[argn], "%lf", &dimfactor) != 1) + pm_usage(usage); + if (dimfactor < 0.0 || dimfactor > 1.0) + pm_error("dim factor must be in the range from 0.0 to 1.0 "); + ++argn; + + /* parse in filename (if present, stdin otherwise) */ + if (argn != argc) + { + ifp = pm_openr(argv[argn]); + ++argn; + } + else + ifp = stdin; + + if (argn != argc) + pm_usage(usage); + + /* read first data from file */ + ppm_readppminit(ifp, &cols, &rows, &maxval, &format); + + /* no error checking required here, ppmlib does it all for us */ + srcrow = ppm_allocrow(cols); + + longfactor = (long)(dimfactor * 65536); + + /* allocate a row of pixel data for the new pixels */ + destrow = ppm_allocrow(cols); + + ppm_writeppminit(stdout, cols, rows, maxval, 0); + + /** now do the ntsc'ing (actually very similar to ppmdim) **/ + for (i = 0; i < rows; i++) + { + ppm_readppmrow(ifp, srcrow, cols, maxval, format); + + pP = srcrow; + pP2 = destrow; + + for (j = 0; j < cols; j++) + { + /* every alternating row is left in unchanged condition */ + if (i & 1) + { + PPM_ASSIGN(*pP2, PPM_GETR(*pP), PPM_GETG(*pP), PPM_GETB(*pP)); + } + /* and the other lines are dimmed to the specified factor */ + else + { + PPM_ASSIGN(*pP2, (PPM_GETR(*pP) * longfactor) >> 16, + (PPM_GETG(*pP) * longfactor) >> 16, + (PPM_GETB(*pP) * longfactor) >> 16); + } + pP++; + pP2++; + } + + /* write out one line of graphic data */ + ppm_writeppmrow(stdout, destrow, cols, maxval, 0); + } + + pm_close(ifp); + ppm_freerow(srcrow); + ppm_freerow(destrow); + + exit(0); } |