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#include <fitz.h>
/* TODO: these should go in fz_rastfuncs */
typedef void (*rowfunc)(unsigned char *src, unsigned char *dst, int w, int ncomp, int denom);
typedef void (*colfunc)(unsigned char *src, unsigned char *dst, int w, int ncomp, int denom);
static void
scalerow(unsigned char *src, unsigned char *dst, int w, int ncomp, int denom)
{
int x, left, k;
int sum[FZ_MAXCOLORS];
left = 0;
for (k = 0; k < ncomp; k++)
sum[k] = 0;
for (x = 0; x < w; x++)
{
for (k = 0; k < ncomp; k++)
sum[k] += src[x * ncomp + k];
if (++left == denom)
{
left = 0;
for (k = 0; k < ncomp; k++)
{
dst[k] = sum[k] / denom;
sum[k] = 0;
}
dst += ncomp;
}
}
/* left overs */
if (left)
for (k = 0; k < ncomp; k++)
dst[k] = sum[k] / left;
}
static void
scalerow1(unsigned char *src, unsigned char *dst, int w, int ncomp, int denom)
{
int x, left;
int sum;
left = 0;
sum = 0;
for (x = 0; x < w; x++)
{
sum += *src++;
if (++left == denom)
{
left = 0;
*dst++ = sum / denom;
sum = 0;
}
}
/* left overs */
if (left)
{
*dst++ = sum / left;
}
}
static void
scalerow2(unsigned char *src, unsigned char *dst, int w, int ncomp, int denom)
{
int x, left;
int sum0, sum1;
left = 0;
sum0 = 0;
sum1 = 0;
for (x = 0; x < w; x++)
{
sum0 += *src++;
sum1 += *src++;
if (++left == denom)
{
left = 0;
*dst++ = sum0 / denom;
*dst++ = sum1 / denom;
sum0 = 0;
sum1 = 0;
}
}
/* left overs */
if (left)
{
*dst++ = sum0 / left;
*dst++ = sum1 / left;
}
}
static void
scalecols(unsigned char *src, unsigned char *dst, int w, int ncomp, int denom)
{
int x, y, k;
unsigned char *s;
int sum[FZ_MAXCOLORS];
for (x = 0; x < w; x++)
{
s = src + (x * ncomp);
for (k = 0; k < ncomp; k++)
sum[k] = 0;
for (y = 0; y < denom; y++)
for (k = 0; k < ncomp; k++)
sum[k] += s[y * w * ncomp + k];
for (k = 0; k < ncomp; k++)
dst[k] = sum[k] / denom;
dst += ncomp;
}
}
static void
scalecols1(unsigned char *src, unsigned char *dst, int w, int ncomp, int denom)
{
int x, y;
unsigned char *s;
int sum;
for (x = 0; x < w; x++)
{
s = src + x;
sum = 0;
for (y = 0; y < denom; y++)
sum += s[y * w];
*dst++ = sum / denom;
}
}
static void
scalecols2(unsigned char *src, unsigned char *dst, int w, int ncomp, int denom)
{
int x, y;
unsigned char *s;
int sum0, sum1;
for (x = 0; x < w; x++)
{
s = src + (x * 2);
sum0 = 0;
sum1 = 0;
for (y = 0; y < denom; y++)
{
sum0 += s[y * w * 2 + 0];
sum1 += s[y * w * 2 + 1];
}
*dst++ = sum0 / denom;
*dst++ = sum1 / denom;
}
}
fz_error *
fz_scalepixmap(fz_pixmap **dstp, fz_pixmap *src, int xdenom, int ydenom)
{
fz_error *error;
fz_pixmap *dst;
unsigned char *buf;
int y, iy, oy;
int ow, oh, n;
rowfunc rowfunc;
colfunc colfunc;
ow = (src->w + xdenom - 1) / xdenom;
oh = (src->h + ydenom - 1) / ydenom;
n = src->n;
buf = fz_malloc(ow * n * ydenom);
if (!buf)
return fz_outofmem;
error = fz_newpixmap(&dst, 0, 0, ow, oh, src->n);
if (error)
{
fz_free(buf);
return error;
}
switch (n)
{
case 1:
rowfunc = scalerow1;
colfunc = scalecols1;
break;
case 2:
rowfunc = scalerow2;
colfunc = scalecols2;
break;
default:
rowfunc = scalerow;
colfunc = scalecols;
break;
}
for (y = 0, oy = 0; y < (src->h / ydenom) * ydenom; y += ydenom, oy++)
{
for (iy = 0; iy < ydenom; iy++)
rowfunc(src->samples + (y + iy) * src->w * n,
buf + iy * ow * n,
src->w, n, xdenom);
colfunc(buf, dst->samples + oy * dst->w * n, dst->w, n, ydenom);
}
ydenom = src->h - y;
if (ydenom)
{
for (iy = 0; iy < ydenom; iy++)
rowfunc(src->samples + (y + iy) * src->w * n,
buf + iy * ow * n,
src->w, n, xdenom);
colfunc(buf, dst->samples + oy * dst->w * n, dst->w, n, ydenom);
}
fz_free(buf);
*dstp = dst;
return nil;
}
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