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#include <fitz.h>
typedef unsigned char byte;
/*
* Mask -- blit one span (clipped and adjusted)
*
* mask_g
* mask_i1
* mask_o1
* mask_i1o1
* mask_o4w3
* mask_i1o4w3
*/
static void mask_g(int n, byte *src, byte *pix)
{
memcpy(pix, src, n);
}
static void mask_i1(int n, byte *src, byte *dst)
{
while (n--)
{
dst[0] = fz_mul255(src[0], dst[0]);
src++;
dst++;
}
}
static void mask_o1(int n, byte *src, byte *dst)
{
while (n--)
{
dst[0] = src[0] + fz_mul255(dst[0], 255 - src[0]);
src++;
dst++;
}
}
static void mask_i1o1(int n, byte *src, byte *msk, byte *dst)
{
while (n--)
{
byte sa = fz_mul255(src[0], msk[0]);
dst[0] = sa + fz_mul255(dst[0], 255 - sa);
src++;
msk++;
dst++;
}
}
static void mask_o4w3(int n, byte *src, byte *dst, byte *rgb)
{
byte sa, ssa;
while (n--)
{
sa = src[0];
ssa = 255 - sa;
dst[0] = sa + fz_mul255(dst[0], ssa);
dst[1] = rgb[0] + fz_mul255((short)dst[1] - rgb[0], ssa);
dst[2] = rgb[1] + fz_mul255((short)dst[2] - rgb[1], ssa);
dst[3] = rgb[2] + fz_mul255((short)dst[3] - rgb[2], ssa);
src ++;
dst += 4;
}
}
static void mask_i1o4w3(int n, byte *src, byte *msk, byte *dst, byte *rgb)
{
byte sa, ssa;
while (n--)
{
sa = fz_mul255(src[0], msk[0]);
ssa = 255 - sa;
dst[0] = sa + fz_mul255(dst[0], ssa);
dst[1] = rgb[0] + fz_mul255((short)dst[1] - rgb[0], ssa);
dst[2] = rgb[1] + fz_mul255((short)dst[2] - rgb[1], ssa);
dst[3] = rgb[2] + fz_mul255((short)dst[3] - rgb[2], ssa);
src ++;
msk ++;
dst += 4;
}
}
/*
* Image -- blit entire image
*
* img1_g
* img1_i1
* img1_o1
* img1_i1o1
* img1_o4w3
* img1_i1o4w3
*
* img4_g
* img4_o4
* img4_i1o4
*/
#define lerpmsk(a,b,t) (a + (((b - a) * t) >> 16))
static inline byte getmsk(byte *s, int w, int h, int u, int v)
{
if (u < 0 || u >= w) return 0;
if (v < 0 || v >= h) return 0;
return s[w * v + u];
}
static inline int samplemsk(byte *s, int w, int h, int u, int v)
{
int ui = u >> 16;
int vi = v >> 16;
int ud = u & 0xFF;
int vd = v & 0xFF;
int a = getmsk(s, w, h, ui, vi);
int b = getmsk(s, w, h, ui+1, vi);
int c = getmsk(s, w, h, ui, vi+1);
int d = getmsk(s, w, h, ui+1, vi+1);
int ab = lerpmsk(a, b, ud);
int cd = lerpmsk(c, d, ud);
return lerpmsk(ab, cd, vd);
}
static inline void lerpargb(byte *dst, byte *a, byte *b, int t)
{
dst[0] = lerpmsk(a[0], b[0], t);
dst[1] = lerpmsk(a[1], b[1], t);
dst[2] = lerpmsk(a[2], b[2], t);
dst[3] = lerpmsk(a[3], b[3], t);
}
static inline byte *getargb(byte *s, int w, int h, int u, int v)
{
static byte zero[4] = { 0, 0, 0, 0 };
if (u < 0 || u >= w) return zero;
if (v < 0 || v >= h) return zero;
return s + ((w * v + u) << 2);
}
static inline void sampleargb(byte *s, int w, int h, int u, int v, byte *abcd)
{
byte ab[4];
byte cd[4];
int ui = u >> 16;
int vi = v >> 16;
int ud = u & 0xFF;
int vd = v & 0xFF;
byte *a = getargb(s, w, h, ui, vi);
byte *b = getargb(s, w, h, ui+1, vi);
byte *c = getargb(s, w, h, ui, vi+1);
byte *d = getargb(s, w, h, ui+1, vi+1);
lerpargb(ab, a, b, ud);
lerpargb(cd, c, d, ud);
lerpargb(abcd, ab, cd, vd);
}
#define PSRC byte *src, int w, int h, int nx, int ny
#define PDST byte *dst0, int dstw
#define PMSK byte *msk0, int mskw
#define PCTM int u0, int v0, int fa, int fb, int fc, int fd
#if 0
static void example(PSRC, PDST, PMSK, PCTM)
{
while (ny--)
{
byte *dst = dst0;
byte *msk = msk0;
int u = u0;
int v = v0;
while (nx--)
{
// dst[0] = ... msk[0] ... sample(s, w, h, u, v);
dst ++;
msk ++;
u += fa;
v += fb;
}
u0 += fc;
v0 += fd;
dst0 += dstw;
msk0 += mskw;
}
}
#endif
#define BLOOP \
while (ny--) \
{ \
byte *dst = dst0; \
int u = u0; \
int v = v0; \
while (nx--) \
#define ELOOP \
u0 += fc; \
v0 += fd; \
dst0 += dstw; \
}
#define BLOOPM \
while (ny--) \
{ \
byte *dst = dst0; \
byte *msk = msk0; \
int u = u0; \
int v = v0; \
while (nx--) \
#define ELOOPM \
u0 += fc; \
v0 += fd; \
dst0 += dstw; \
msk0 += mskw; \
}
static void img1_g(PSRC, PDST, PCTM)
{
BLOOP
{
dst[0] = samplemsk(src, w, h, u, v);
dst ++;
u += fa;
v += fb;
}
ELOOP
}
static void img1_i1(PSRC, PDST, PCTM)
{
BLOOP
{
dst[0] = fz_mul255(dst[0], samplemsk(src, w, h, u, v));
dst ++;
u += fa;
v += fb;
}
ELOOP
}
static void img1_o1(PSRC, PDST, PCTM)
{
BLOOP
{
byte sa = samplemsk(src, w, h, u, v);
dst[0] = sa + fz_mul255(dst[0], 255 - sa);
dst ++;
u += fa;
v += fb;
}
ELOOP
}
static void img1_i1o1(PSRC, PDST, PMSK, PCTM)
{
BLOOPM
{
byte sa = fz_mul255(msk[0], samplemsk(src, w, h, u, v));
dst[0] = sa + fz_mul255(dst[0], 255 - sa);
dst ++;
msk ++;
u += fa;
v += fb;
}
ELOOPM
}
static void img1_o4w3(PSRC, PDST, PCTM, byte *rgb)
{
BLOOP
{
byte sa = samplemsk(src, w, h, u, v);
byte ssa = 255 - sa;
dst[0] = sa + fz_mul255(dst[0], ssa);
dst[1] = rgb[0] + fz_mul255((short)dst[1] - rgb[0], ssa);
dst[2] = rgb[1] + fz_mul255((short)dst[2] - rgb[1], ssa);
dst[3] = rgb[2] + fz_mul255((short)dst[3] - rgb[2], ssa);
dst += 4;
u += fa;
v += fb;
}
ELOOP
}
static void img1_i1o4w3(PSRC, PDST, PMSK, PCTM, byte *rgb)
{
BLOOPM
{
byte sa = fz_mul255(msk[0], samplemsk(src, w, h, u, v));
byte ssa = 255 - sa;
dst[0] = sa + fz_mul255(dst[0], ssa);
dst[1] = rgb[0] + fz_mul255((short)dst[1] - rgb[0], ssa);
dst[2] = rgb[1] + fz_mul255((short)dst[2] - rgb[1], ssa);
dst[3] = rgb[2] + fz_mul255((short)dst[3] - rgb[2], ssa);
dst += 4;
msk ++;
u += fa;
v += fb;
}
ELOOPM
}
static void img4_g(PSRC, PDST, PCTM)
{
BLOOP
{
sampleargb(src, w, h, u, v, dst);
dst += 4;
u += fa;
v += fb;
}
ELOOP
}
static void img4_o4(PSRC, PDST, PCTM)
{
byte argb[4];
BLOOP
{
sampleargb(src, w, h, u, v, argb);
byte ssa = 255 - argb[0];
dst[0] = argb[0] + fz_mul255(dst[0], ssa);
dst[1] = argb[1] + fz_mul255((short)dst[1] - argb[1], ssa);
dst[2] = argb[2] + fz_mul255((short)dst[2] - argb[2], ssa);
dst[3] = argb[3] + fz_mul255((short)dst[3] - argb[3], ssa);
dst += 4;
u += fa;
v += fb;
}
ELOOP
}
static void img4_i1o4(PSRC, PDST, PMSK, PCTM)
{
byte argb[4];
BLOOPM
{
sampleargb(src, w, h, u, v, argb);
byte sa = fz_mul255(msk[0], argb[0]);
byte ssa = 255 - sa;
dst[0] = argb[0] + fz_mul255(dst[0], ssa);
dst[1] = argb[1] + fz_mul255((short)dst[1] - argb[1], ssa);
dst[2] = argb[2] + fz_mul255((short)dst[2] - argb[2], ssa);
dst[3] = argb[3] + fz_mul255((short)dst[3] - argb[3], ssa);
dst += 4;
msk ++;
u += fa;
v += fb;
}
ELOOPM
}
/*
*
*/
void
fz_defaultrastfuncs(fz_rastfuncs *tab)
{
tab->mask_g = mask_g;
tab->mask_i1 = mask_i1;
tab->mask_o1 = mask_o1;
tab->mask_i1o1 = mask_i1o1;
tab->mask_o4w3 = mask_o4w3;
tab->mask_i1o4w3 = mask_i1o4w3;
tab->img1_g = img1_g;
tab->img1_i1 = img1_i1;
tab->img1_o1 = img1_o1;
tab->img1_i1o1 = img1_i1o1;
tab->img1_o4w3 = img1_o4w3;
tab->img1_i1o4w3 = img1_i1o4w3;
tab->img4_g = img4_g;
tab->img4_o4 = img4_o4;
tab->img4_i1o4 = img4_i1o4;
}
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