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#ifndef UNSUPPORTED
static void convert_3d(struct filter *f, int *x1, int *y1)
{
struct threeddata *data = (struct threeddata *) f->data;
int y;
int x = *x1;
unsigned int inp;
unsigned int height = data->height;
register CONST spixel_t *input;
if (x >= f->childimage->width - 5 || x < 0
|| *y1 > f->childimage->height) {
*x1 += *y1 / 2;
return;
}
if (x < 0)
x = 0;
for (y = f->childimage->height - 3; y >= 0; y--) {
int d;
input = ((spixel_t *) f->childimage->currlines[y] + y / 2);
inp = (input[x] + input[x + 1] + input[x + 2] +
input[x + 3] + input[x + 4] + input[x + 5]);
input = ((spixel_t *) f->childimage->currlines[y + 1] + y / 2);
inp += (input[x] + input[x + 1] + input[x + 2] +
input[x + 3] + input[x + 4] + input[x + 5]);
input = ((spixel_t *) f->childimage->currlines[y + 2] + y / 2);
inp += (input[x] + input[x + 1] + input[x + 2] +
input[x + 3] + input[x + 4] + input[x + 5]);
d = y - (inp / 16 > height ? height : inp / 16);
if (d <= *y1) {
*y1 = y;
*x1 = x + y / 2;
return;
}
}
*x1 += *y1 / 2;
return;
}
static void convertup_3d(struct filter *f, int *x1, int *y1)
{
struct threeddata *data = (struct threeddata *) f->data;
int y = *y1;
int x = *x1;
unsigned int inp;
unsigned int height = data->height;
register CONST spixel_t *input;
if (x >= f->childimage->width - 5)
x = f->childimage->width - 6;
if (y >= f->childimage->height - 3)
y = f->childimage->height - 3;
if (x < 0)
x = 0;
if (y < 0)
y = 0;
input = ((spixel_t *) f->childimage->currlines[y] + y / 2);
inp = (input[x] + input[x + 1] + input[x + 2] +
input[x + 3] + input[x + 4] + input[x + 5]);
input = ((spixel_t *) f->childimage->currlines[y + 1] + y / 2);
inp += (input[x] + input[x + 1] + input[x + 2] +
input[x + 3] + input[x + 4] + input[x + 5]);
input = ((spixel_t *) f->childimage->currlines[y + 2] + y / 2);
inp += (input[x] + input[x + 1] + input[x + 2] +
input[x + 3] + input[x + 4] + input[x + 5]);
*x1 -= *y1 / 2;
*y1 = y - (inp / 16 > height ? height : inp / 16);
}
static void do_3d(void *dataptr, struct taskinfo *task, int r1, int r2)
{
struct filter *RESTRICT f = (struct filter *) dataptr;
unsigned int y;
int maxinp = 0;
unsigned int x;
unsigned int end;
unsigned int sum;
spixel_t CONST *RESTRICT input;
unsigned int *RESTRICT lengths;
unsigned int *RESTRICT sums;
unsigned int *RESTRICT relsums;
struct threeddata *data = (struct threeddata *) f->data;
/* Copy to local variables to improve cse and memory references. */
unsigned int height = data->height;
unsigned int stereogrammode = data->stereogrammode;
unsigned int colheight = data->colheight;
unsigned int midcolor = data->midcolor;
unsigned int darkcolor = data->darkcolor;
CONST unsigned int *RESTRICT pixels = data->pixels;
cpixel_t *RESTRICT * RESTRICT currlines =
(cpixel_t * RESTRICT * RESTRICT) f->image->currlines;
struct inp {
int max;
unsigned int down;
} *inpdata;
#ifdef HAVE_ALLOCA1
lengths =
(unsigned int *) alloca(sizeof(unsigned int) * f->image->width);
inpdata =
(struct inp *) alloca(sizeof(struct inp) * (f->image->width + 2));
sums =
(unsigned int *) alloca(sizeof(unsigned int) *
(f->image->width + 2) * 2);
#else
lengths =
(unsigned int *) malloc(sizeof(unsigned int) * f->image->width);
inpdata =
(struct inp *) malloc(sizeof(struct inp) * (f->image->width + 2));
sums =
(unsigned int *) malloc(sizeof(unsigned int) *
(f->image->width + 2) * 2);
#endif
for (x = 0; x < (unsigned int) f->image->width; x++)
lengths[x] = f->image->height - 1,
sums[x * 2 + 0] = 0, sums[x * 2 + 1] = 0, inpdata[x].max = 0;
sums[x * 2 + 0] = 0, sums[x * 2 + 1] = 0, inpdata[x].max = 0;
inpdata[x + 1].max = 0;
end = r2;
for (y = f->childimage->height - 2; y > 0;) {
y--;
input = ((spixel_t *) f->childimage->currlines[y] + y / 2);
x = r1;
relsums = sums + (y & 1);
/* Fix boundary cases. */
/*relsums[0] = relsums[1];
relsums[end*2-1] = relsums[end*2-2]; */
inpdata[end + 1] = inpdata[end] = inpdata[end - 1];
sum =
input[x] + input[x + 1] + input[x + 2] + input[x + 3] +
input[x + 4] + input[x + 5];
while (x < end) {
unsigned int inp;
unsigned int d;
/* Average pixel values of 5*3 square to get nicer shapes. */
sum += input[x + 6] - input[x];
inp = sum + sums[x * 2 + 1] + sums[x * 2];
relsums[x * 2] = sum;
inpdata[x].down = inp;
/* Calculate shades. */
maxinp = inpdata[x + 2].max;
if ((int) inp > maxinp)
inpdata[x].max = inp - 32;
else
inpdata[x].max = maxinp - 32;
/* caluclate top of mountain. */
d = inp / 16;
d = y - (d > height ? height : d);
/* Underflow */
if (d > 65535U)
d = 0;
if (d < lengths[x]) {
int y1;
unsigned int color;
if (stereogrammode)
color = pixels[y];
else if (inp / 16 > height)
/*Red thinks on the top. */
color =
pixels[inp / 16 >=
colheight ? colheight : inp / 16];
else {
int c;
/* Simple shading model.
Depends only on the preceding voxel. */
c = ((int) inpdata[x + 2].down - (int) inp) / 8;
/* Get shades. */
color =
((int) inp > maxinp ? midcolor : darkcolor) - c;
color =
pixels[color <
65535 ? (color <
height ? color : height) : 0];
}
for (y1 = lengths[x]; y1 >= (int) d; y1--) {
p_setp(currlines[y1], x, color);
}
lengths[x] = d;
}
x++;
}
}
#ifndef HAVE_ALLOCA1
free(lengths);
free(inpdata);
free(sums);
#endif
}
#endif
#undef do_3d
#undef convert_3d
#undef convertup_3d
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