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+/* $XFree86: xc/programs/Xserver/iplan2p4/iplply1rct.c,v 3.1 1998/03/20 21:08:09 hohndel Exp $ */
+/*
+ * $XConsortium: iplply1rct.c,v 1.14 94/04/17 20:28:56 dpw Exp $
+ *
+Copyright (c) 1990 X Consortium
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+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
+X CONSORTIUM 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 X Consortium 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 X Consortium.
+ *
+ * Author: Keith Packard, MIT X Consortium
+ */
+
+/* Modified nov 94 by Martin Schaller (Martin_Schaller@maus.r.de) for use with
+interleaved planes */
+
+#include "X.h"
+
+#include "gcstruct.h"
+#include "windowstr.h"
+#include "pixmapstr.h"
+#include "regionstr.h"
+#include "scrnintstr.h"
+#include "mistruct.h"
+
+#include "ipl.h"
+#include "iplrrop.h"
+
+#include "iplmskbits.h"
+
+void
+INTER_RROP_NAME(iplFillPoly1Rect) (pDrawable, pGC, shape, mode, count, ptsIn)
+ DrawablePtr pDrawable;
+ GCPtr pGC;
+ int count;
+ DDXPointPtr ptsIn;
+{
+ iplPrivGCPtr devPriv;
+ int ngwidth;
+ unsigned short *addrl, *addr;
+ int maxy;
+ int origin;
+ register int vertex1, vertex2;
+ int c;
+ BoxPtr extents;
+ int clip;
+ int y;
+ int *vertex1p, *vertex2p;
+ int *endp;
+ int x1, x2;
+ int dx1, dx2;
+ int dy1, dy2;
+ int e1, e2;
+ int step1, step2;
+ int sign1, sign2;
+ int h;
+ int l, r;
+ INTER_DECLAREG(mask);
+ INTER_DECLAREG(bits);
+ int nmiddle;
+ INTER_RROP_DECLARE
+ bits=~0;
+
+ if (mode == CoordModePrevious)
+ {
+ miFillPolygon (pDrawable, pGC, shape, mode, count, ptsIn);
+ return;
+ }
+
+ devPriv = iplGetGCPrivate(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);
+ origin -= (origin & 0x8000) << 1;
+ extents = &pGC->pCompositeClip->extents;
+ INTER_RROP_FETCH_GCPRIV(devPriv);
+ vertex1 = *((int *) &extents->x1) - origin;
+ vertex2 = *((int *) &extents->x2) - origin - 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) ((a) + (y) * ngwidth)
+
+ iplGetGroupWidthAndPointer(pDrawable, ngwidth, addrl);
+ 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;
+ r = x2;
+ nmiddle = x2 - x1;
+ if (nmiddle < 0)
+ {
+ nmiddle = -nmiddle;
+ l = x2;
+ r = x1;
+ }
+ c = l & INTER_PIM;
+ l -= c;
+
+ addr = addrl + (l >> INTER_PGSH) * INTER_PLANES;
+ if (c + nmiddle < INTER_PPG)
+ {
+ mask = (bits >> c) ^ (bits >> (c+nmiddle));
+ INTER_RROP_SOLID_MASK(addr,mask);
+ }
+ else
+ {
+ if (c)
+ {
+ mask = bits >> c;
+ INTER_RROP_SOLID_MASK(addr,mask);
+ nmiddle += c - INTER_PPG;
+ INTER_NEXT_GROUP(addr);
+ }
+ nmiddle >>= INTER_PGSH;
+ while (--nmiddle >= 0) {
+ INTER_RROP_SOLID(addr); INTER_NEXT_GROUP(addr);
+ }
+ if (mask = ~(bits >> (r & INTER_PIM)))
+ INTER_RROP_SOLID_MASK(addr,mask);
+ }
+ 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);
+ }
+}
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