static void
adaptRowFormat(struct pam * const inpamP,
struct pam * const outpamP,
tuple * const tuplerow) {
/*----------------------------------------------------------------------------
Convert the row in 'tuplerow', which is in a format described by
*inpamP, to the format described by *outpamP.
'tuplerow' must have enough allocated depth to do this.
-----------------------------------------------------------------------------*/
assert(outpamP->visual);
assert(inpamP->visual);
pnm_scaletuplerow(inpamP, tuplerow, tuplerow, outpamP->maxval);
if (outpamP->color_depth == 3) {
if (outpamP->have_opacity)
pnm_makerowrgba(inpamP, tuplerow);
else
pnm_makerowrgb(inpamP, tuplerow);
} else {
if (outpamP->have_opacity)
pnm_addopacityrow(inpamP, tuplerow);
}
}
static void
adaptRowToOutputFormat(struct pam * const inpamP,
tuple * const tuplerow,
struct pam * const outpamP) {
/*----------------------------------------------------------------------------
Convert the row in 'tuplerow', which is in a format described by
*inpamP, to the format described by *outpamP.
'tuplerow' must have enough allocated depth to do this.
-----------------------------------------------------------------------------*/
pnm_scaletuplerow(inpamP, tuplerow, tuplerow, outpamP->maxval);
if (strncmp(outpamP->tuple_type, "RGB", 3) == 0)
pnm_makerowrgb(inpamP, tuplerow);
}
static void
convertRowStraight(struct pam * const inpamP,
struct pam * const outpamP,
tuple inrow[],
depthAdjustment const depthAdjustment,
tupletable const colormap,
struct colormapFinder * const colorFinderP,
tuplehash const colorhash,
bool * const usehashP,
tuple const defaultColor,
tuple outrow[],
unsigned int * const missingCountP) {
/*----------------------------------------------------------------------------
Like convertRow(), compute outrow[] from inrow[], replacing each pixel with
the new colors. Do a straight pixel for pixel remap; no dithering.
Return the number of pixels that were not matched in the color map as
*missingCountP.
*colorFinderP is a color finder based on 'colormap' -- it tells us what
index of 'colormap' corresponds to a certain color.
-----------------------------------------------------------------------------*/
unsigned int col;
unsigned int missingCount;
/* The following modify tuplerow, to make it consistent with
*outpamP instead of *inpamP.
*/
assert(outpamP->allocation_depth >= inpamP->depth);
pnm_scaletuplerow(inpamP, outrow, inrow, outpamP->maxval);
adjustDepthRow(outrow, outpamP->width, depthAdjustment);
missingCount = 0; /* initial value */
for (col = 0; col < outpamP->width; ++col) {
bool missing;
mapTuple(outpamP, outrow[col], defaultColor,
colormap, colorFinderP,
colorhash, usehashP, outrow[col], &missing);
if (missing)
++missingCount;
}
*missingCountP = missingCount;
}