ref: b76e8ecc732cb311ceee6fd6c807b7e784d3fe31
dir: /sys/src/ape/X11/cmd/X/cfb/cfbply1rct.c/
/*
*
Copyright 1990, 1998 The Open Group
Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.
*
* Author: Keith Packard, MIT X Consortium
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include <stdlib.h>
#include <X11/X.h>
#include "gcstruct.h"
#include "windowstr.h"
#include "pixmapstr.h"
#include "regionstr.h"
#include "scrnintstr.h"
#include "mistruct.h"
#include "cfb.h"
#include "cfbmskbits.h"
#include "cfbrrop.h"
void
RROP_NAME(cfbFillPoly1Rect) (pDrawable, pGC, shape, mode, count, ptsIn)
DrawablePtr pDrawable;
GCPtr pGC;
int shape;
int mode;
int count;
DDXPointPtr ptsIn;
{
cfbPrivGCPtr devPriv;
int nwidth;
CfbBits *addrl, *addr;
#if PSZ == 24
CfbBits startmask, endmask;
register int pidx;
#else
#if PPW > 1
CfbBits mask, bits = ~((CfbBits)0);
#endif
#endif
int maxy;
int origin;
register int vertex1, vertex2;
int c = 0;
BoxPtr extents;
int clip;
int y;
int *vertex1p = NULL, *vertex2p;
int *endp;
int x1 = 0, x2 = 0;
int dx1 = 0, dx2 = 0;
int dy1 = 0, dy2 = 0;
int e1 = 0, e2 = 0;
int step1 = 0, step2 = 0;
int sign1 = 0, sign2 = 0;
int h;
int l;
#if PSZ != 24 && PPW > 1
int r;
#endif
int nmiddle;
RROP_DECLARE
if (mode == CoordModePrevious)
{
miFillPolygon (pDrawable, pGC, shape, mode, count, ptsIn);
return;
}
devPriv = cfbGetGCPrivate(pGC);
#ifdef NO_ONE_RECT
if (REGION_NUM_RECTS(pGC->pCompositeClip) != 1)
{
miFillPolygon (pDrawable, pGC, shape, mode, count, ptsIn);
return;
}
#endif
origin = *((int *) &pDrawable->x);
vertex2 = origin - ((origin & 0x8000) << 1);
extents = &pGC->pCompositeClip->extents;
RROP_FETCH_GCPRIV(devPriv);
vertex1 = *((int *) &extents->x1) - vertex2;
vertex2 = *((int *) &extents->x2) - vertex2 - 0x00010001;
clip = 0;
y = 32767;
maxy = 0;
vertex2p = (int *) ptsIn;
endp = vertex2p + count;
if (shape == Convex)
{
while (count--)
{
c = *vertex2p;
clip |= (c - vertex1) | (vertex2 - c);
c = intToY(c);
if (c < y)
{
y = c;
vertex1p = vertex2p;
}
vertex2p++;
if (c > maxy)
maxy = c;
}
}
else
{
int yFlip = 0;
dx1 = 1;
x2 = -1;
x1 = -1;
while (count--)
{
c = *vertex2p;
clip |= (c - vertex1) | (vertex2 - c);
c = intToY(c);
if (c < y)
{
y = c;
vertex1p = vertex2p;
}
vertex2p++;
if (c > maxy)
maxy = c;
if (c == x1)
continue;
if (dx1 > 0)
{
if (x2 < 0)
x2 = c;
else
dx2 = dx1 = (c - x1) >> 31;
}
else
if ((c - x1) >> 31 != dx1)
{
dx1 = ~dx1;
yFlip++;
}
x1 = c;
}
x1 = (x2 - c) >> 31;
if (x1 != dx1)
yFlip++;
if (x1 != dx2)
yFlip++;
if (yFlip != 2)
clip = 0x8000;
}
if (y == maxy)
return;
if (clip & 0x80008000)
{
miFillPolygon (pDrawable, pGC, shape, mode, vertex2p - (int *) ptsIn, ptsIn);
return;
}
#define AddrYPlus(a,y) (CfbBits *) (((unsigned char *) (a)) + (y) * nwidth)
cfbGetTypedWidthAndPointer(pDrawable, nwidth, addrl, unsigned char, CfbBits);
addrl = AddrYPlus(addrl,y + pDrawable->y);
origin = intToX(origin);
vertex2p = vertex1p;
vertex2 = vertex1 = *vertex2p++;
if (vertex2p == endp)
vertex2p = (int *) ptsIn;
#define Setup(c,x,vertex,dx,dy,e,sign,step) {\
x = intToX(vertex); \
if ((dy = intToY(c) - y)) { \
dx = intToX(c) - x; \
step = 0; \
if (dx >= 0) \
{ \
e = 0; \
sign = 1; \
if (dx >= dy) {\
step = dx / dy; \
dx = dx % dy; \
} \
} \
else \
{ \
e = 1 - dy; \
sign = -1; \
dx = -dx; \
if (dx >= dy) { \
step = - (dx / dy); \
dx = dx % dy; \
} \
} \
} \
x += origin; \
vertex = c; \
}
#define Step(x,dx,dy,e,sign,step) {\
x += step; \
if ((e += dx) > 0) \
{ \
x += sign; \
e -= dy; \
} \
}
for (;;)
{
if (y == intToY(vertex1))
{
do
{
if (vertex1p == (int *) ptsIn)
vertex1p = endp;
c = *--vertex1p;
Setup (c,x1,vertex1,dx1,dy1,e1,sign1,step1)
} while (y >= intToY(vertex1));
h = dy1;
}
else
{
Step(x1,dx1,dy1,e1,sign1,step1)
h = intToY(vertex1) - y;
}
if (y == intToY(vertex2))
{
do
{
c = *vertex2p++;
if (vertex2p == endp)
vertex2p = (int *) ptsIn;
Setup (c,x2,vertex2,dx2,dy2,e2,sign2,step2)
} while (y >= intToY(vertex2));
if (dy2 < h)
h = dy2;
}
else
{
Step(x2,dx2,dy2,e2,sign2,step2)
if ((c = (intToY(vertex2) - y)) < h)
h = c;
}
/* fill spans for this segment */
y += h;
for (;;)
{
l = x1;
#if PSZ != 24 && PPW > 1
r = x2;
#endif
nmiddle = x2 - x1;
if (nmiddle < 0)
{
nmiddle = -nmiddle;
l = x2;
#if PSZ != 24 && PPW > 1
r = x1;
#endif
}
#if PPW > 1
c = l & PIM;
l -= c;
#endif
#if PGSZ == 32
#define LWRD_SHIFT 2
#else /* PGSZ == 64 */
#define LWRD_SHIFT 3
#endif /* PGSZ */
#if PSZ == 24
addr = (CfbBits *)((char *)addrl + ((l * 3) & ~0x03));
if (nmiddle <= 1){
if (nmiddle)
RROP_SOLID24(addr, l);
} else {
maskbits(l, nmiddle, startmask, endmask, nmiddle);
pidx = l & 3;
if (startmask){
RROP_SOLID_MASK(addr, startmask, pidx-1);
addr++;
if (pidx == 3)
pidx = 0;
}
while (--nmiddle >= 0){
RROP_SOLID(addr, pidx);
addr++;
if (++pidx == 3)
pidx = 0;
}
if (endmask)
RROP_SOLID_MASK(addr, endmask, pidx);
}
#else /* PSZ == 24 */
#if PWSH > LWRD_SHIFT
l = l >> (PWSH - LWRD_SHIFT);
#endif
#if PWSH < LWRD_SHIFT
l = l << (LWRD_SHIFT - PWSH);
#endif
addr = (CfbBits *) (((char *) addrl) + l);
#if PPW > 1
if (c + nmiddle < PPW)
{
mask = SCRRIGHT (bits,c) ^ SCRRIGHT (bits,c+nmiddle);
RROP_SOLID_MASK(addr,mask);
}
else
{
if (c)
{
mask = SCRRIGHT(bits, c);
RROP_SOLID_MASK(addr,mask);
nmiddle += c - PPW;
addr++;
}
#endif
nmiddle >>= PWSH;
while (--nmiddle >= 0) {
RROP_SOLID(addr); addr++;
}
#if PPW > 1
if ((mask = ~SCRRIGHT(bits, r & PIM)))
RROP_SOLID_MASK(addr,mask);
}
#endif
#endif /* PSZ == 24 */
if (!--h)
break;
addrl = AddrYPlus (addrl, 1);
Step(x1,dx1,dy1,e1,sign1,step1)
Step(x2,dx2,dy2,e2,sign2,step2)
}
if (y == maxy)
break;
addrl = AddrYPlus (addrl, 1);
}
RROP_UNDECLARE
}