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#include "fitz.h"
/*
* Unpack image samples and optionally pad pixels with opaque alpha
*/
#define get1(buf,x) ((buf[x >> 3] >> ( 7 - (x & 7) ) ) & 1 )
#define get2(buf,x) ((buf[x >> 2] >> ( ( 3 - (x & 3) ) << 1 ) ) & 3 )
#define get4(buf,x) ((buf[x >> 1] >> ( ( 1 - (x & 1) ) << 2 ) ) & 15 )
#define get8(buf,x) (buf[x])
#define get16(buf,x) (buf[x << 1])
void
fz_unpacktile(fz_pixmap *dst, unsigned char * restrict src, int n, int depth, int stride)
{
int pad, x, y, k;
pad = 0;
if (dst->n > n)
pad = (1 << depth) - 1;
/* TODO: reinsert Robin Watts' specialized loops here */
for (y = 0; y < dst->h; y++)
{
unsigned char *sp = src + y * stride;
unsigned char *dp = dst->samples + y * (dst->w * dst->n);
int b = 0;
for (x = 0; x < dst->w; x++)
{
for (k = 0; k < n; k++)
{
switch (depth)
{
case 1: *dp++ = get1(sp, b); break;
case 2: *dp++ = get2(sp, b); break;
case 4: *dp++ = get4(sp, b); break;
case 8: *dp++ = get8(sp, b); break;
case 16: *dp++ = get16(sp, b); break;
}
b++;
}
if (pad)
*dp++ = pad;
}
}
}
/*
* Apply decode parameters and scale integers
*/
void
fz_decodetile(fz_pixmap *pix, float *decode, int scale)
{
int min[FZ_MAXCOLORS + 2];
int max[FZ_MAXCOLORS + 2];
int sub[FZ_MAXCOLORS + 2];
unsigned char *p = pix->samples;
int len = pix->w * pix->h;
int n = pix->n;
int needed;
int k;
needed = scale != 1;
for (k = 0; k < n; k++)
{
min[k] = decode[k * 2] * 255;
max[k] = decode[k * 2 + 1] * 255;
sub[k] = max[k] - min[k];
needed |= min[k] != 0 || max[k] != 255;
}
if (!needed)
return;
while (len--)
{
for (k = 0; k < n; k++)
p[k] = min[k] + fz_mul255(sub[k], p[k] * scale);
p += n;
}
}
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