ref: a568eea78d38d3229d9c67645d508cb98946b0bc
parent: 31aac06d204f233a9452de880a1911d3dd1984bb
author: Erik Quanstrom <quanstro@quanstro.net>
date: Tue Dec 28 15:53:46 EST 2010
devdraw: add new draw operators
--- a/libmemdraw/draw.c
+++ b/libmemdraw/draw.c
@@ -10,23 +10,35 @@
#define RGB2K(r,g,b) ((156763*(r)+307758*(g)+59769*(b))>>19)
/*
- * for 0 ≤ x ≤ 255*255, (x*0x0101+0x100)>>16 is a perfect approximation.
- * for 0 ≤ x < (1<<16), x/255 = ((x+1)*0x0101)>>16 is a perfect approximation.
- * the last one is perfect for all up to 1<<16, avoids a multiply, but requires a rathole.
+ * For 16-bit values, x / 255 == (t = x+1, (t+(t>>8)) >> 8).
+ * We add another 127 to round to the nearest value rather
+ * than truncate.
+ *
+ * CALCxy does x bytewise calculations on y input images (x=1,4; y=1,2).
+ * CALC2x does two parallel 16-bit calculations on y input images (y=1,2).
*/
-/* #define DIV255(x) (((x)*257+256)>>16) */
-#define DIV255(x) ((((x)+1)*257)>>16)
-/* #define DIV255(x) (tmp=(x)+1, (tmp+(tmp>>8))>>8) */
+#define CALC11(a, v, tmp) \
+ (tmp=(a)*(v)+128, (tmp+(tmp>>8))>>8)
-#define MUL(x, y, t) (t = (x)*(y)+128, (t+(t>>8))>>8)
-#define MASK13 0xFF00FF00
-#define MASK02 0x00FF00FF
-#define MUL13(a, x, t) (t = (a)*(((x)&MASK13)>>8)+128, ((t+((t>>8)&MASK02))>>8)&MASK02)
-#define MUL02(a, x, t) (t = (a)*(((x)&MASK02)>>0)+128, ((t+((t>>8)&MASK02))>>8)&MASK02)
-#define MUL0123(a, x, s, t) ((MUL13(a, x, s)<<8)|MUL02(a, x, t))
+#define CALC12(a1, v1, a2, v2, tmp) \
+ (tmp=(a1)*(v1)+(a2)*(v2)+128, (tmp+(tmp>>8))>>8)
-#define MUL2(u, v, x, y) (t = (u)*(v)+(x)*(y)+256, (t+(t>>8))>>8)
+#define MASK 0xFF00FF
+#define CALC21(a, vvuu, tmp) \
+ (tmp=(a)*(vvuu)+0x00800080, ((tmp+((tmp>>8)&MASK))>>8)&MASK)
+
+#define CALC41(a, rgba, tmp1, tmp2) \
+ (CALC21(a, rgba & MASK, tmp1) | \
+ (CALC21(a, (rgba>>8)&MASK, tmp2)<<8))
+
+#define CALC22(a1, vvuu1, a2, vvuu2, tmp) \
+ (tmp=(a1)*(vvuu1)+(a2)*(vvuu2)+0x00800080, ((tmp+((tmp>>8)&MASK))>>8)&MASK)
+
+#define CALC42(a1, rgba1, a2, rgba2, tmp1, tmp2) \
+ (CALC22(a1, rgba1 & MASK, a2, rgba2 & MASK, tmp1) | \
+ (CALC22(a1, (rgba1>>8) & MASK, a2, (rgba2>>8) & MASK, tmp2)<<8))
+
static void mktables(void);
typedef int Subdraw(Memdrawparam*);
static Subdraw chardraw, alphadraw, memoptdraw;
@@ -307,6 +319,9 @@
* Conversion tables.
*/
static uchar replbit[1+8][256]; /* replbit[x][y] is the replication of the x-bit quantity y to 8-bit depth */
+static uchar conv18[256][8]; /* conv18[x][y] is the yth pixel in the depth-1 pixel x */
+static uchar conv28[256][4]; /* ... */
+static uchar conv48[256][2];
/*
* bitmap of how to replicate n bits to fill 8, for 1 ≤ n ≤ 8.
@@ -340,7 +355,7 @@
static void
mktables(void)
{- int i, j, small;
+ int i, j, mask, sh, small;
if(tablesbuilt)
return;
@@ -357,6 +372,17 @@
}
}
+ /* bit unpacking up to 8 bits, only powers of 2 */
+ for(i=0; i<256; i++){+ for(j=0, sh=7, mask=1; j<8; j++, sh--)
+ conv18[i][j] = replbit[1][(i>>sh)&mask];
+
+ for(j=0, sh=6, mask=3; j<4; j++, sh-=2)
+ conv28[i][j] = replbit[2][(i>>sh)&mask];
+
+ for(j=0, sh=4, mask=15; j<2; j++, sh-=4)
+ conv48[i][j] = replbit[4][(i>>sh)&mask];
+ }
}
static uchar ones = 0xff;
@@ -770,6 +796,50 @@
return bdst;
}
+/*
+ * Do the channels in the buffers match enough
+ * that we can do word-at-a-time operations
+ * on the pixels?
+ */
+static int
+chanmatch(Buffer *bdst, Buffer *bsrc)
+{+ uchar *drgb, *srgb;
+
+ /*
+ * first, r, g, b must be in the same place
+ * in the rgba word.
+ */
+ drgb = (uchar*)bdst->rgba;
+ srgb = (uchar*)bsrc->rgba;
+ if(bdst->red - drgb != bsrc->red - srgb
+ || bdst->blu - drgb != bsrc->blu - srgb
+ || bdst->grn - drgb != bsrc->grn - srgb)
+ return 0;
+
+ /*
+ * that implies alpha is in the same place,
+ * if it is there at all (it might be == &ones).
+ * if the destination is &ones, we can scribble
+ * over the rgba slot just fine.
+ */
+ if(bdst->alpha == &ones)
+ return 1;
+
+ /*
+ * if the destination is not ones but the src is,
+ * then the simultaneous calculation will use
+ * bogus bytes from the src's rgba. no good.
+ */
+ if(bsrc->alpha == &ones)
+ return 0;
+
+ /*
+ * otherwise, alphas are in the same place.
+ */
+ return 1;
+}
+
static Buffer
alphacalc14(Buffer bdst, Buffer bsrc, Buffer bmask, int dx, int grey, int op)
{@@ -776,26 +846,26 @@
Buffer obdst;
int fd, sadelta;
int i, sa, ma, q;
- ulong s, t;
+ ulong t, t1;
obdst = bdst;
sadelta = bsrc.alpha == &ones ? 0 : bsrc.delta;
- q = bsrc.delta == 4 && bdst.delta == 4;
+ q = bsrc.delta == 4 && bdst.delta == 4 && chanmatch(&bdst, &bsrc);
for(i=0; i<dx; i++){sa = *bsrc.alpha;
ma = *bmask.alpha;
- fd = MUL(sa, ma, t);
+ fd = CALC11(sa, ma, t);
if(op == DoutS)
fd = 255-fd;
if(grey){- *bdst.grey = MUL(fd, *bdst.grey, t);
+ *bdst.grey = CALC11(fd, *bdst.grey, t);
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{ if(q){- *bdst.rgba = MUL0123(fd, *bdst.rgba, s, t);
+ *bdst.rgba = CALC41(fd, *bdst.rgba, t, t1);
bsrc.rgba++;
bdst.rgba++;
bsrc.alpha += sadelta;
@@ -802,9 +872,9 @@
bmask.alpha += bmask.delta;
continue;
}
- *bdst.red = MUL(fd, *bdst.red, t);
- *bdst.grn = MUL(fd, *bdst.grn, t);
- *bdst.blu = MUL(fd, *bdst.blu, t);
+ *bdst.red = CALC11(fd, *bdst.red, t);
+ *bdst.grn = CALC11(fd, *bdst.grn, t);
+ *bdst.blu = CALC11(fd, *bdst.blu, t);
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
@@ -813,7 +883,7 @@
bdst.grn += bdst.delta;
}
if(bdst.alpha != &ones){- *bdst.alpha = MUL(fd, *bdst.alpha, t);
+ *bdst.alpha = CALC11(fd, *bdst.alpha, t);
bdst.alpha += bdst.delta;
}
bmask.alpha += bmask.delta;
@@ -828,11 +898,11 @@
Buffer obdst;
int fs, sadelta;
int i, ma, da, q;
- ulong s, t;
+ ulong t, t1;
obdst = bdst;
sadelta = bsrc.alpha == &ones ? 0 : bsrc.delta;
- q = bsrc.delta == 4 && bdst.delta == 4;
+ q = bsrc.delta == 4 && bdst.delta == 4 && chanmatch(&bdst, &bsrc);
for(i=0; i<dx; i++){ma = *bmask.alpha;
@@ -841,15 +911,15 @@
da = 255-da;
fs = ma;
if(op != S)
- fs = MUL(fs, da, t);
+ fs = CALC11(fs, da, t);
if(grey){- *bdst.grey = MUL(fs, *bsrc.grey, t);
+ *bdst.grey = CALC11(fs, *bsrc.grey, t);
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{ if(q){- *bdst.rgba = MUL0123(fs, *bsrc.rgba, s, t);
+ *bdst.rgba = CALC41(fs, *bsrc.rgba, t, t1);
bsrc.rgba++;
bdst.rgba++;
bmask.alpha += bmask.delta;
@@ -856,9 +926,9 @@
bdst.alpha += bdst.delta;
continue;
}
- *bdst.red = MUL(fs, *bsrc.red, t);
- *bdst.grn = MUL(fs, *bsrc.grn, t);
- *bdst.blu = MUL(fs, *bsrc.blu, t);
+ *bdst.red = CALC11(fs, *bsrc.red, t);
+ *bdst.grn = CALC11(fs, *bsrc.grn, t);
+ *bdst.blu = CALC11(fs, *bsrc.blu, t);
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
@@ -867,7 +937,7 @@
bdst.grn += bdst.delta;
}
if(bdst.alpha != &ones){- *bdst.alpha = MUL(fs, *bsrc.alpha, t);
+ *bdst.alpha = CALC11(fs, *bsrc.alpha, t);
bdst.alpha += bdst.delta;
}
bmask.alpha += bmask.delta;
@@ -882,11 +952,11 @@
Buffer obdst;
int fs, fd, sadelta;
int i, sa, ma, da, q;
- ulong s, t, u, v;
+ ulong t, t1;
obdst = bdst;
sadelta = bsrc.alpha == &ones ? 0 : bsrc.delta;
- q = bsrc.delta == 4 && bdst.delta == 4;
+ q = bsrc.delta == 4 && bdst.delta == 4 && chanmatch(&bdst, &bsrc);
for(i=0; i<dx; i++){sa = *bsrc.alpha;
@@ -893,24 +963,24 @@
ma = *bmask.alpha;
da = *bdst.alpha;
if(op == SatopD)
- fs = MUL(ma, da, t);
+ fs = CALC11(ma, da, t);
else
- fs = MUL(ma, 255-da, t);
+ fs = CALC11(ma, 255-da, t);
if(op == DoverS)
fd = 255;
else{- fd = MUL(sa, ma, t);
+ fd = CALC11(sa, ma, t);
if(op != DatopS)
fd = 255-fd;
}
if(grey){- *bdst.grey = MUL(fs, *bsrc.grey, s)+MUL(fd, *bdst.grey, t);
+ *bdst.grey = CALC12(fs, *bsrc.grey, fd, *bdst.grey, t);
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{ if(q){- *bdst.rgba = MUL0123(fs, *bsrc.rgba, s, t)+MUL0123(fd, *bdst.rgba, u, v);
+ *bdst.rgba = CALC42(fs, *bsrc.rgba, fd, *bdst.rgba, t, t1);
bsrc.rgba++;
bdst.rgba++;
bsrc.alpha += sadelta;
@@ -918,9 +988,9 @@
bdst.alpha += bdst.delta;
continue;
}
- *bdst.red = MUL(fs, *bsrc.red, s)+MUL(fd, *bdst.red, t);
- *bdst.grn = MUL(fs, *bsrc.grn, s)+MUL(fd, *bdst.grn, t);
- *bdst.blu = MUL(fs, *bsrc.blu, s)+MUL(fd, *bdst.blu, t);
+ *bdst.red = CALC12(fs, *bsrc.red, fd, *bdst.red, t);
+ *bdst.grn = CALC12(fs, *bsrc.grn, fd, *bdst.grn, t);
+ *bdst.blu = CALC12(fs, *bsrc.blu, fd, *bdst.blu, t);
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
@@ -929,7 +999,7 @@
bdst.grn += bdst.delta;
}
if(bdst.alpha != &ones){- *bdst.alpha = MUL(fs, sa, s)+MUL(fd, da, t);
+ *bdst.alpha = CALC12(fs, sa, fd, da, t);
bdst.alpha += bdst.delta;
}
bmask.alpha += bmask.delta;
@@ -953,25 +1023,25 @@
Buffer obdst;
int fd, sadelta;
int i, sa, ma, q;
- ulong s, t, u, v;
+ ulong t, t1;
USED(op);
obdst = bdst;
sadelta = bsrc.alpha == &ones ? 0 : bsrc.delta;
- q = bsrc.delta == 4 && bdst.delta == 4;
+ q = bsrc.delta == 4 && bdst.delta == 4 && chanmatch(&bdst, &bsrc);
for(i=0; i<dx; i++){sa = *bsrc.alpha;
ma = *bmask.alpha;
- fd = 255-MUL(sa, ma, t);
+ fd = 255-CALC11(sa, ma, t);
if(grey){- *bdst.grey = MUL(ma, *bsrc.grey, s)+MUL(fd, *bdst.grey, t);
+ *bdst.grey = CALC12(ma, *bsrc.grey, fd, *bdst.grey, t);
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{ if(q){- *bdst.rgba = MUL0123(ma, *bsrc.rgba, s, t)+MUL0123(fd, *bdst.rgba, u, v);
+ *bdst.rgba = CALC42(ma, *bsrc.rgba, fd, *bdst.rgba, t, t1);
bsrc.rgba++;
bdst.rgba++;
bsrc.alpha += sadelta;
@@ -978,9 +1048,9 @@
bmask.alpha += bmask.delta;
continue;
}
- *bdst.red = MUL(ma, *bsrc.red, s)+MUL(fd, *bdst.red, t);
- *bdst.grn = MUL(ma, *bsrc.grn, s)+MUL(fd, *bdst.grn, t);
- *bdst.blu = MUL(ma, *bsrc.blu, s)+MUL(fd, *bdst.blu, t);
+ *bdst.red = CALC12(ma, *bsrc.red, fd, *bdst.red, t);
+ *bdst.grn = CALC12(ma, *bsrc.grn, fd, *bdst.grn, t);
+ *bdst.blu = CALC12(ma, *bsrc.blu, fd, *bdst.blu, t);
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
@@ -989,7 +1059,7 @@
bdst.grn += bdst.delta;
}
if(bdst.alpha != &ones){- *bdst.alpha = MUL(ma, sa, s)+MUL(fd, *bdst.alpha, t);
+ *bdst.alpha = CALC12(ma, sa, fd, *bdst.alpha, t);
bdst.alpha += bdst.delta;
}
bmask.alpha += bmask.delta;
@@ -1045,7 +1115,7 @@
Buffer obdst;
int fd;
int i, ma;
- ulong s, t;
+ ulong t;
USED(op);
obdst = bdst;
@@ -1055,13 +1125,13 @@
fd = 255-ma;
if(grey){- *bdst.grey = MUL(ma, *bsrc.grey, s)+MUL(fd, *bdst.grey, t);
+ *bdst.grey = CALC12(ma, *bsrc.grey, fd, *bdst.grey, t);
bsrc.grey += bsrc.delta;
bdst.grey += bdst.delta;
}else{- *bdst.red = MUL(ma, *bsrc.red, s)+MUL(fd, *bdst.red, t);
- *bdst.grn = MUL(ma, *bsrc.grn, s)+MUL(fd, *bdst.grn, t);
- *bdst.blu = MUL(ma, *bsrc.blu, s)+MUL(fd, *bdst.blu, t);
+ *bdst.red = CALC12(ma, *bsrc.red, fd, *bdst.red, t);
+ *bdst.grn = CALC12(ma, *bsrc.grn, fd, *bdst.grn, t);
+ *bdst.blu = CALC12(ma, *bsrc.blu, fd, *bdst.blu, t);
bsrc.red += bsrc.delta;
bsrc.blu += bsrc.delta;
bsrc.grn += bsrc.delta;
@@ -1070,7 +1140,7 @@
bdst.grn += bdst.delta;
}
if(bdst.alpha != &ones){- *bdst.alpha = ma+MUL(fd, *bdst.alpha, t);
+ *bdst.alpha = ma+CALC11(fd, *bdst.alpha, t);
bdst.alpha += bdst.delta;
}
bmask.alpha += bmask.delta;
@@ -1117,7 +1187,7 @@
Buffer obdst;
int fs, fd;
int i, ma, da, zero;
- ulong s, t;
+ ulong t;
obdst = bdst;
zero = !(op&1);
@@ -1134,7 +1204,7 @@
if(grey){if(ma)
- *bdst.grey = MUL(fs, *bsrc.grey, s)+MUL(fd, *bdst.grey, t);
+ *bdst.grey = CALC12(fs, *bsrc.grey, fd, *bdst.grey, t);
else if(zero)
*bdst.grey = 0;
bsrc.grey += bsrc.delta;
@@ -1141,9 +1211,9 @@
bdst.grey += bdst.delta;
}else{ if(ma){- *bdst.red = MUL(fs, *bsrc.red, s)+MUL(fd, *bdst.red, t);
- *bdst.grn = MUL(fs, *bsrc.grn, s)+MUL(fd, *bdst.grn, t);
- *bdst.blu = MUL(fs, *bsrc.blu, s)+MUL(fd, *bdst.blu, t);
+ *bdst.red = CALC12(fs, *bsrc.red, fd, *bdst.red, t);
+ *bdst.grn = CALC12(fs, *bsrc.grn, fd, *bdst.grn, t);
+ *bdst.blu = CALC12(fs, *bsrc.blu, fd, *bdst.blu, t);
}
else if(zero)
*bdst.red = *bdst.grn = *bdst.blu = 0;
@@ -1157,7 +1227,7 @@
bmask.alpha += bmask.delta;
if(bdst.alpha != &ones){if(ma)
- *bdst.alpha = fs+MUL(fd, da, t);
+ *bdst.alpha = fs+CALC11(fd, da, t);
else if(zero)
*bdst.alpha = 0;
bdst.alpha += bdst.delta;
@@ -1890,7 +1960,7 @@
default:
assert(0 /* boolcopyfn */);
}
- return 0;
+ return nil;
}
/*
@@ -2353,7 +2423,7 @@
bx = -bsh-1;
ex = -bsh-1-dx;
- bits = 0;
+ SET(bits);
v = par->sdval;
/* make little endian */
@@ -2457,7 +2527,6 @@
{ulong bits;
int d, y;
- uchar p[4];
if(val == DNofill)
return;
@@ -2471,11 +2540,6 @@
default: /* 1, 2, 4, 8, 16, 32 */
for(d=i->depth; d<32; d*=2)
bits = (bits << d) | bits;
- p[0] = bits; /* make little endian */
- p[1] = bits>>8;
- p[2] = bits>>16;
- p[3] = bits>>24;
- bits = *(ulong*)p;
memsetl(wordaddr(i, i->r.min), bits, i->width*Dy(i->r));
break;
}