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/*********************************************************************/
/* ppmmix - mix together two pictures like with a fader */
/* Frank Neumann, October 1993 */
/* V1.2 16.11.1993 */
/* */
/*********************************************************************/
#include "ppm.h"
int main(int argc, const char ** argv) {
FILE * if1P;
FILE * if2P;
int argn;
int rows1, cols1, format1;
unsigned int row;
int rows2, cols2, format2;
pixel *srcrow1, *srcrow2, *destrow;
pixval maxval1, maxval2;
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 */
pm_proginit(&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;
if (argn == argc-2) {
if1P = pm_openr(argv[argn]);
++argn;
if2P = pm_openr(argv[argn]);
} else
pm_usage(usage);
ppm_readppminit(if1P, &cols1, &rows1, &maxval1, &format1);
ppm_readppminit(if2P, &cols2, &rows2, &maxval2, &format2);
if ((cols1 != cols2) || (rows1 != rows2))
pm_error("image sizes are different!");
if (maxval1 != maxval2)
pm_error("images have different maxvalues");
srcrow1 = ppm_allocrow(cols1);
srcrow2 = ppm_allocrow(cols2);
longfactor = (long)(fadefactor * 65536);
destrow = ppm_allocrow(cols1);
ppm_writeppminit(stdout, cols1, rows1, maxval1, 0);
for (row = 0; row < rows1; ++row) {
unsigned int col;
ppm_readppmrow(if1P, srcrow1, cols1, maxval1, format1);
ppm_readppmrow(if2P, srcrow2, cols2, maxval2, format2);
for (col = 0; col < cols1; ++col) {
pixel const p1 = srcrow1[col];
pixval const r1 = PPM_GETR(p1);
pixval const g1 = PPM_GETG(p1);
pixval const b1 = PPM_GETB(p1);
pixel const p2 = srcrow2[col];
pixval const r2 = PPM_GETR(p2);
pixval const g2 = PPM_GETG(p2);
pixval const b2 = PPM_GETB(p2);
pixval const r = r1 + (((r2 - r1) * longfactor) >> 16);
pixval const g = g1 + (((g2 - g1) * longfactor) >> 16);
pixval const b = b1 + (((b2 - b1) * longfactor) >> 16);
PPM_ASSIGN(destrow[col], r, g, b);
}
ppm_writeppmrow(stdout, destrow, cols1, maxval1, 0);
}
pm_close(if1P);
pm_close(if2P);
ppm_freerow(srcrow1);
ppm_freerow(srcrow2);
ppm_freerow(destrow);
return 0;
}
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