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/*********************************************************************/
/* 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;
char *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);
}
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