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);
}