static void
writePam(struct pam * const outpamP,
unsigned int const nfiles,
const coord * const coords,
const struct pam * const imgs) {
tuple *tuplerow;
int i;
pnm_writepaminit(outpamP);
tuplerow = pnm_allocpamrow(outpamP);
for (i = 0; i < outpamP->height; ++i) {
int j;
for (j = 0; j < nfiles; ++j) {
if (coords[j].y <= i && i < coords[j].y + imgs[j].height) {
pnm_readpamrow(&imgs[j], &tuplerow[coords[j].x]);
adjustDepth(tuplerow, &imgs[j], outpamP, coords[j]);
adjustMaxval(tuplerow, &imgs[j], outpamP, coords[j]);
}
}
pnm_writepamrow(outpamP, tuplerow);
}
pnm_freepamrow(tuplerow);
}
static void
writePam(struct pam * const outpamP,
unsigned int const imgCt,
const Coord * const coords,
const struct pam * const imgs) {
/*----------------------------------------------------------------------------
Write the entire composite image. There are 'imgCt' source images,
described by imgs[]. Their placement in the output is coords[].
Properties of the output image, including where to write it
and its dimensions are *outpamP.
-----------------------------------------------------------------------------*/
tuple * tuplerow;
unsigned int row; /* Row number in the output image */
pnm_writepaminit(outpamP);
tuplerow = pnm_allocpamrow(outpamP);
for (row = 0; row < outpamP->height; ++row) {
unsigned int imgIdx;
makeRowBlack(outpamP, tuplerow); /* initial value */
for (imgIdx = 0; imgIdx < imgCt; ++imgIdx) {
const Coord * const imgCoordP = &coords[imgIdx];
const struct pam * const imgPamP = &imgs[imgIdx];
if (imgCoordP->y <= row && row < imgCoordP->y + imgPamP->height) {
pnm_readpamrow(imgPamP, &tuplerow[imgCoordP->x]);
adjustDepth(tuplerow, imgPamP, outpamP, *imgCoordP);
adjustMaxval(tuplerow, imgPamP, outpamP, *imgCoordP);
}
}
pnm_writepamrow(outpamP, tuplerow);
}
pnm_freepamrow(tuplerow);
}