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#include "fitz.h"
typedef unsigned char byte;
/*
* Apply decode parameters
*/
static void decodetile(fz_pixmap *pix, int skip, float *decode)
{
int min[FZ_MAXCOLORS];
int max[FZ_MAXCOLORS];
int sub[FZ_MAXCOLORS];
int needed = 0;
int n = pix->n;
byte *p = pix->samples;
int wh = pix->w * pix->h;
int i;
int justinvert = 1;
min[0] = 0;
max[0] = 255;
sub[0] = 255;
for (i = skip; i < n; i++)
{
min[i] = decode[(i - skip) * 2] * 255;
max[i] = decode[(i - skip) * 2 + 1] * 255;
sub[i] = max[i] - min[i];
needed |= (min[i] != 0) | (max[i] != 255);
justinvert &= min[i] == 255 && max[i] == 0 && sub[i] == -255;
}
if (!needed)
return;
switch (n) {
case 1:
while (wh--)
{
p[0] = min[0] + fz_mul255(sub[0], p[0]);
p ++;
}
break;
case 2:
if (justinvert) {
unsigned *wp = (unsigned *)p;
if ((((char *)wp - (char *)0) & 3) == 0) {
int hwh = wh / 2;
wh = wh - 2 * hwh;
while(hwh--) {
unsigned in = *wp;
#if BYTE_ORDER == LITTLE_ENDIAN
unsigned out = in ^ 0xff00ff00;
#else
unsigned out = in ^ 0x00ff00ff;
#endif
*wp++ = out;
}
p = (byte *)wp;
}
if (wh--) {
p[0] = p[0];
p[1] = 255 - p[1];
p += 2;
}
}
else
while (wh--)
{
p[0] = min[0] + fz_mul255(sub[0], p[0]);
p[1] = min[1] + fz_mul255(sub[1], p[1]);
p += 2;
}
break;
default:
while (wh--)
{
for (i = 0; i < n; i++)
p[i] = min[i] + fz_mul255(sub[i], p[i]);
p += n;
}
}
}
/*
* Unpack image samples and optionally pad pixels with opaque alpha
*/
#define tbit(buf,x) ((buf[x >> 3] >> ( 7 - (x & 7) ) ) & 1 ) * 255
#define ttwo(buf,x) ((buf[x >> 2] >> ( ( 3 - (x & 3) ) << 1 ) ) & 3 ) * 85
#define tnib(buf,x) ((buf[x >> 1] >> ( ( 1 - (x & 1) ) << 2 ) ) & 15 ) * 17
#define toct(buf,x) (buf[x])
#define thex(buf,x) (buf[x << 1])
static byte t1pad0[256][8];
static byte t1pad1[256][16];
static void init1(void)
{
static int inited = 0;
byte bits[1];
int i, k, x;
if (inited)
return;
for (i = 0; i < 256; i++)
{
bits[0] = i;
for (k = 0; k < 8; k++)
{
x = tbit(bits, k);
t1pad0[i][k] = x;
t1pad1[i][k * 2 + 0] = 255;
t1pad1[i][k * 2 + 1] = x;
}
}
inited = 1;
}
static void loadtile1(byte * restrict src, int sw, byte * restrict dst, int dw, int w, int h, int pad)
{
byte *sp;
byte *dp;
int x;
init1();
if (pad == 0)
{
int w3 = w >> 3;
while (h--)
{
sp = src;
dp = dst;
for (x = 0; x < w3; x++)
{
memcpy(dp, t1pad0[*sp++], 8);
dp += 8;
}
x = x << 3;
if (x < w)
memcpy(dp, t1pad0[*sp], w - x);
src += sw;
dst += dw;
}
}
else if (pad == 1)
{
int w3 = w >> 3;
while (h--)
{
sp = src;
dp = dst;
for (x = 0; x < w3; x++)
{
memcpy(dp, t1pad1[*sp++], 16);
dp += 16;
}
x = x << 3;
if (x < w)
memcpy(dp, t1pad1[*sp], (w - x) << 1);
src += sw;
dst += dw;
}
}
else
{
while (h--)
{
dp = dst;
for (x = 0; x < w; x++)
{
if ((x % pad) == 0)
*dp++ = 255;
*dp++ = tbit(src, x);
}
src += sw;
dst += dw;
}
}
}
#define TILE(getf) \
{ \
int x; \
if (!pad) \
while (h--) \
{ \
for (x = 0; x < w; x++) \
dst[x] = getf(src, x); \
src += sw; \
dst += dw; \
} \
else { \
int tpad; \
while (h--) \
{ \
byte *dp = dst; \
tpad = 0; \
for (x = 0; x < w; x++) \
{ \
if (!tpad--) { \
tpad = pad-1; \
*dp++ = 255; \
} \
*dp++ = getf(src, x); \
} \
src += sw; \
dst += dw; \
} \
} \
}
static void loadtile2(byte * restrict src, int sw, byte * restrict dst, int dw, int w, int h, int pad)
TILE(ttwo)
static void loadtile4(byte * restrict src, int sw, byte * restrict dst, int dw, int w, int h, int pad)
TILE(tnib)
static void loadtile8(byte * restrict src, int sw, byte * restrict dst, int dw, int w, int h, int pad)
TILE(toct)
static void loadtile16(byte * restrict src, int sw, byte * restrict dst, int dw, int w, int h, int pad)
TILE(thex)
void (*fz_decodetile)(fz_pixmap *pix, int skip, float *decode) = decodetile;
void (*fz_loadtile1)(byte*, int sw, byte*, int dw, int w, int h, int pad) = loadtile1;
void (*fz_loadtile2)(byte*, int sw, byte*, int dw, int w, int h, int pad) = loadtile2;
void (*fz_loadtile4)(byte*, int sw, byte*, int dw, int w, int h, int pad) = loadtile4;
void (*fz_loadtile8)(byte*, int sw, byte*, int dw, int w, int h, int pad) = loadtile8;
void (*fz_loadtile16)(byte*, int sw, byte*, int dw, int w, int h, int pad) = loadtile16;
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