diff options
Diffstat (limited to 'editor/ppmmix.c')
| -rw-r--r-- | editor/ppmmix.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/editor/ppmmix.c b/editor/ppmmix.c new file mode 100644 index 00000000..5306d1cf --- /dev/null +++ b/editor/ppmmix.c @@ -0,0 +1,131 @@ + +/*********************************************************************/ +/* ppmmix - mix together two pictures like with a fader */ +/* Frank Neumann, October 1993 */ +/* V1.2 16.11.1993 */ +/* */ +/* version history: */ +/* V1.0 Aug 1993 first version */ +/* V1.1 12.10.1993 uses ppm libs&headers, integer math, cleanups */ +/* V1.2 16.11.1993 Rewritten to be NetPBM.programming conforming */ +/*********************************************************************/ + +#include "ppm.h" + +/* global variables */ +#ifdef AMIGA +static char *version = "$VER: ppmmix 1.2 (16.11.93)"; /* Amiga version identification */ +#endif + +/**************************/ +/* start of main function */ +/**************************/ +int main(argc, argv) +int argc; +char *argv[]; +{ + FILE *ifp1, *ifp2; + int argn, rows, cols, format, i = 0, j = 0; + int rows2, cols2, format2; + pixel *srcrow1, *srcrow2, *destrow; + pixel *pP1, *pP2, *pP3; + pixval maxval, maxval2; + pixval r1, r2, r3, g1, g2, g3, b1, b2, b3; + double fadefactor; + long longfactor; + const char * const usage = "fadefactor ppmfile1 ppmfile2\n fadefactor: 0.0 = only ppmfile1, 1.0 = only ppmfile2\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", &fadefactor) != 1) + pm_usage(usage); + if (fadefactor < 0.0 || fadefactor > 1.0) + pm_error("fade factor must be in the range from 0.0 to 1.0 "); + ++argn; + + /* parse in filenames and open files (cannot be stdin-filters, sorry..) */ + if (argn == argc-2) + { + ifp1 = pm_openr(argv[argn]); + ++argn; + ifp2 = pm_openr(argv[argn]); + } + else + pm_usage(usage); + + /* read first data from both files and compare sizes etc. */ + ppm_readppminit(ifp1, &cols, &rows, &maxval, &format); + ppm_readppminit(ifp2, &cols2, &rows2, &maxval2, &format2); + + if ( (cols != cols2) || (rows != rows2) ) + pm_error("image sizes are different!"); + + if ( maxval != maxval2) + pm_error("images have different maxvalues"); + + if (format != format2) + { + pm_error("images have different PxM types"); + } + + /* no error checking required here, ppmlib does it all for us */ + srcrow1 = ppm_allocrow(cols); + srcrow2 = ppm_allocrow(cols); + + longfactor = (long)(fadefactor * 65536); + + /* allocate a row of pixel data for the new pixels */ + destrow = ppm_allocrow(cols); + + ppm_writeppminit(stdout, cols, rows, maxval, 0); + + for (i = 0; i < rows; i++) + { + ppm_readppmrow(ifp1, srcrow1, cols, maxval, format); + ppm_readppmrow(ifp2, srcrow2, cols, maxval, format); + + pP1 = srcrow1; + pP2 = srcrow2; + pP3 = destrow; + + for (j = 0; j < cols; j++) + { + r1 = PPM_GETR(*pP1); + g1 = PPM_GETG(*pP1); + b1 = PPM_GETB(*pP1); + + r2 = PPM_GETR(*pP2); + g2 = PPM_GETG(*pP2); + b2 = PPM_GETB(*pP2); + + r3 = r1 + (((r2 - r1) * longfactor) >> 16); + g3 = g1 + (((g2 - g1) * longfactor) >> 16); + b3 = b1 + (((b2 - b1) * longfactor) >> 16); + + + PPM_ASSIGN(*pP3, r3, g3, b3); + + pP1++; + pP2++; + pP3++; + } + + /* write out one line of graphic data */ + ppm_writeppmrow(stdout, destrow, cols, maxval, 0); + } + + pm_close(ifp1); + pm_close(ifp2); + ppm_freerow(srcrow1); + ppm_freerow(srcrow2); + ppm_freerow(destrow); + + exit(0); +} + |