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#include "fitz.h"
typedef unsigned char byte;
/*
* Blend pixmap regions
*/
/* dst = src over dst */
static void
duff_non(byte * restrict sp, int sw, int sn, byte * restrict dp, int dw, int w0, int h)
{
int k;
sw -= w0*sn;
dw -= w0*sn;
while (h--)
{
int w = w0;
while (w--)
{
/* RJW: Alpha handling suspicious here; sp[0] counts twice */
int sa = FZ_EXPAND(sp[0]);
for (k = 0; k < sn; k++)
{
dp[k] = FZ_BLEND(sp[k], dp[k], sa);
}
sp += sn;
dp += sn;
}
sp += sw;
dp += dw;
}
}
/* dst = src in msk over dst */
static void
duff_nimon(byte * restrict sp, int sw, int sn, byte * restrict mp, int mw, int mn, byte * restrict dp, int dw, int w0, int h)
{
int k;
sw -= w0*sn;
mw -= w0*mn;
dw -= w0*sn;
while (h--)
{
int w = w0;
while (w--)
{
/* TODO: validate this */
int ma = FZ_COMBINE(FZ_EXPAND(mp[0]), FZ_EXPAND(sp[0]));
for (k = 0; k < sn; k++)
{
dp[k] = FZ_BLEND(sp[k], dp[k], ma);
}
sp += sn;
mp += mn;
dp += sn;
}
sp += sw;
mp += mw;
dp += dw;
}
}
static void
duff_1o1(byte * restrict sp, int sw, byte * restrict dp, int dw, int w0, int h)
{
/* duff_non(sp0, sw, 1, dp0, dw, w0, h); */
sw -= w0;
dw -= w0;
while (h--)
{
int w = w0;
while (w--)
{
dp[0] = FZ_BLEND(255, dp[0], FZ_EXPAND(sp[0]));
sp ++;
dp ++;
}
sp += sw;
dp += dw;
}
}
static void
duff_4o4(byte *sp, int sw, byte *dp, int dw, int w0, int h)
{
/* duff_non(sp0, sw, 4, dp0, dw, w0, h); */
sw -= w0<<2;
dw -= w0<<2;
while (h--)
{
int w = w0;
while (w--)
{
int alpha = FZ_EXPAND(sp[0]);
dp[0] = FZ_BLEND(sp[0], dp[0], alpha);
dp[1] = FZ_BLEND(sp[1], dp[1], alpha);
dp[2] = FZ_BLEND(sp[2], dp[2], alpha);
dp[3] = FZ_BLEND(sp[3], dp[3], alpha);
sp += 4;
dp += 4;
}
sp += sw;
dp += dw;
}
}
static void
duff_1i1o1(byte * restrict sp, int sw, byte * restrict mp, int mw, byte * restrict dp, int dw, int w0, int h)
{
/* duff_nimon(sp0, sw, 1, mp0, mw, 1, dp0, dw, w0, h); */
sw -= w0;
mw -= w0;
dw -= w0;
while (h--)
{
int w = w0;
while (w--)
{
int ma = FZ_COMBINE(FZ_EXPAND(mp[0]), FZ_EXPAND(sp[0]));
dp[0] = FZ_BLEND(255, dp[0], ma);
sp ++;
mp ++;
dp ++;
}
sp += sw;
mp += mw;
dp += dw;
}
}
static void
duff_4i1o4(byte * restrict sp, int sw, byte * restrict mp, int mw, byte * restrict dp, int dw, int w0, int h)
{
/* duff_nimon(sp, sw, 4, mp, mw, 1, dp, dw, w0, h); */
sw -= w0<<2;
dw -= w0<<2;
mw -= w0;
while (h--)
{
int w = w0;
while (w--)
{
int ma = FZ_COMBINE(FZ_EXPAND(mp[0]), FZ_EXPAND(sp[0]));
dp[0] = FZ_BLEND(255, dp[0], ma);
dp[1] = FZ_BLEND(sp[1], dp[1], ma);
dp[2] = FZ_BLEND(sp[2], dp[2], ma);
dp[3] = FZ_BLEND(sp[3], dp[3], ma);
sp += 4;
mp += 1;
dp += 4;
}
sp += sw;
mp += mw;
dp += dw;
}
}
/*
* Path masks
*/
static void
path_1o1(byte * restrict src, byte cov, int len, byte * restrict dst)
{
while (len--)
{
int c;
cov += *src; *src = 0; src++;
c = FZ_EXPAND(cov);
dst[0] = FZ_BLEND(255, dst[0], c);
dst++;
}
}
static void
path_w4i1o4(byte * restrict argb, byte * restrict src, byte cov, int len, byte * restrict dst)
{
int alpha = FZ_EXPAND(argb[0]);
byte r = argb[1];
byte g = argb[2];
byte b = argb[3];
while (len--)
{
int ca;
cov += *src; *src = 0; src++;
ca = FZ_COMBINE(FZ_EXPAND(cov), alpha);
dst[0] = FZ_BLEND(255, dst[0], ca);
dst[1] = FZ_BLEND(r, dst[1], ca);
dst[2] = FZ_BLEND(g, dst[2], ca);
dst[3] = FZ_BLEND(b, dst[3], ca);
dst += 4;
}
}
/*
* Text masks
*/
static void
text_1o1(byte * restrict src, int srcw, byte * restrict dst, int dstw, int w0, int h)
{
srcw -= w0;
dstw -= w0;
while (h--)
{
int w = w0;
while (w--)
{
int c = FZ_EXPAND(src[0]);
dst[0] = FZ_BLEND(255, dst[0], c);
src++;
dst++;
}
src += srcw;
dst += dstw;
}
}
static void
text_w4i1o4(byte * restrict argb, byte * restrict src, int srcw, byte * restrict dst, int dstw, int w0, int h)
{
int alpha = FZ_EXPAND(argb[0]);
byte r = argb[1];
byte g = argb[2];
byte b = argb[3];
srcw -= w0;
dstw -= w0<<2;
while (h--)
{
int w = w0;
while (w--)
{
int c = FZ_COMBINE(FZ_EXPAND(src[0]), alpha);
dst[0] = FZ_BLEND(255, dst[0], c);
dst[1] = FZ_BLEND(r, dst[1], c);
dst[2] = FZ_BLEND(g, dst[2], c);
dst[3] = FZ_BLEND(b, dst[3], c);
src ++;
dst += 4;
}
src += srcw;
dst += dstw;
}
}
/*
* ... and the function pointers
*/
void (*fz_duff_non)(byte*,int,int,byte*,int,int,int) = duff_non;
void (*fz_duff_nimon)(byte*,int,int,byte*,int,int,byte*,int,int,int) = duff_nimon;
void (*fz_duff_1o1)(byte*,int,byte*,int,int,int) = duff_1o1;
void (*fz_duff_4o4)(byte*,int,byte*,int,int,int) = duff_4o4;
void (*fz_duff_1i1o1)(byte*,int,byte*,int,byte*,int,int,int) = duff_1i1o1;
void (*fz_duff_4i1o4)(byte*,int,byte*,int,byte*,int,int,int) = duff_4i1o4;
void (*fz_path_1o1)(byte*,byte,int,byte*) = path_1o1;
void (*fz_path_w4i1o4)(byte*,byte*,byte,int,byte*) = path_w4i1o4;
void (*fz_text_1o1)(byte*,int,byte*,int,int,int) = text_1o1;
void (*fz_text_w4i1o4)(byte*,byte*,int,byte*,int,int,int) = text_w4i1o4;
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