static void
determineOutputType(const struct pam * const underlayPamP,
const struct pam * const overlayPamP,
struct pam * const composedPamP) {
BaseTupletype const baseTupletype =
commonTupletype(underlayPamP->tuple_type, overlayPamP->tuple_type);
composedPamP->height = underlayPamP->height;
composedPamP->width = underlayPamP->width;
composedPamP->format = commonFormat(underlayPamP->format,
overlayPamP->format);
composedPamP->plainformat = FALSE;
composedPamP->maxval = pm_lcm(underlayPamP->maxval, overlayPamP->maxval,
1, PNM_OVERALLMAXVAL);
composedPamP->visual = true;
composedPamP->color_depth = (baseTupletype == TT_RGB ? 3 : 1);
composedPamP->have_opacity = underlayPamP->have_opacity;
composedPamP->opacity_plane = (baseTupletype == TT_RGB ? 3 : 1);
composedPamP->depth =
(baseTupletype == TT_RGB ? 3 : 1) +
(underlayPamP->have_opacity ? 1 : 0);
determineOutputTupleType(baseTupletype, underlayPamP->have_opacity,
composedPamP->tuple_type,
sizeof(composedPamP->tuple_type));
}
static void
determineOutputType(struct pam * const composedPamP,
struct pam * const underlayPamP,
struct pam * const overlayPamP) {
composedPamP->height = underlayPamP->height;
composedPamP->width = underlayPamP->width;
composedPamP->format = commonFormat(underlayPamP->format,
overlayPamP->format);
composedPamP->plainformat = FALSE;
commonTupletype(underlayPamP->tuple_type, overlayPamP->tuple_type,
composedPamP->tuple_type,
sizeof(composedPamP->tuple_type));
composedPamP->maxval = pm_lcm(underlayPamP->maxval, overlayPamP->maxval,
1, PNM_OVERALLMAXVAL);
if (strcmp(composedPamP->tuple_type, "RGB") == 0)
composedPamP->depth = 3;
else if (strcmp(composedPamP->tuple_type, "GRAYSCALE") == 0)
composedPamP->depth = 1;
else if (strcmp(composedPamP->tuple_type, "BLACKANDWHITE") == 0)
composedPamP->depth = 1;
else
/* Results are undefined for this case, so we just do something safe */
composedPamP->depth = MIN(underlayPamP->depth, overlayPamP->depth);
}
int
main(int argc,
const char ** argv) {
struct cmdlineInfo cmdline;
FILE * ifP;
tuple ** outTuples; /* Output image */
scaler * scalerP;
struct pam inpam;
struct pam outpam;
pm_proginit(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.inputFileName);
pnm_readpaminit(ifP, &inpam, PAM_STRUCT_SIZE(allocation_depth));
pnm_setminallocationdepth(&inpam, 3);
outpam.size = sizeof(outpam);
outpam.len = PAM_STRUCT_SIZE(tuple_type);
outpam.file = stdout;
outpam.width = inpam.width;
outpam.height = inpam.height;
outpam.depth = 3;
outpam.maxval =
pm_lcm(cmdline.colorRes.c[RED]-1,
cmdline.colorRes.c[GRN]-1,
cmdline.colorRes.c[BLU]-1,
PPM_MAXMAXVAL);
outpam.bytes_per_sample = inpam.bytes_per_sample;
STRSCPY(outpam.tuple_type, "RGB");
outpam.format = RPPM_FORMAT;
outpam.plainformat = false;
scaler_create(outpam.maxval, cmdline.colorRes, &scalerP);
ditherImage(&inpam, scalerP, cmdline.dim, cmdline.colorRes,
&outpam, &outTuples);
pnm_writepam(&outpam, outTuples);
scaler_destroy(scalerP);
pnm_freepamarray(outTuples, &outpam);
pm_close(ifP);
return 0;
}
