/*
 *
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
 */

#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 "afb.h"
#include "maskbits.h"

#if defined(mips) || defined(sparc)
#define GetHighWord(x) (((int)(x)) >> 16)
#else
#define GetHighWord(x) (((int)(x)) / 65536)
#endif

#if IMAGE_BYTE_ORDER == MSBFirst
#define intToCoord(i,x,y)	(((x) = GetHighWord(i)), ((y) = (int)((short) (i))))
#define coordToInt(x,y)		(((x) << 16) | (y))
#define intToX(i)				(GetHighWord(i))
#define intToY(i)				((int)((short) i))
#else
#define intToCoord(i,x,y)	(((x) = (int)((short) (i))), ((y) = GetHighWord(i)))
#define coordToInt(x,y)		(((y) << 16) | (x))
#define intToX(i)				((int)((short) (i)))
#define intToY(i)				(GetHighWord(i))
#endif

void
afbFillPolygonSolid (pDrawable, pGC, shape, mode, count, ptsIn)
	DrawablePtr pDrawable;
	GCPtr pGC;
	int shape;
	int mode;
	int count;
	DDXPointPtr ptsIn;
{
	afbPrivGCPtr	devPriv;
	int nlwidth;
	PixelType *addrl, *addr;
	int maxy;
	int origin;
	register int vertex1, vertex2;
	int c;
	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, r;
	PixelType mask, bits = ~((PixelType)0);
	int nmiddle;
	register unsigned char *rrops;
	register int n;
	register int d;
	int sizeDst;
	int depthDst;
	register PixelType *pdst;

	devPriv = (afbPrivGC *)(pGC->devPrivates[afbGCPrivateIndex].ptr);

	if (mode == CoordModePrevious || shape != Convex ||
		REGION_NUM_RECTS(pGC->pCompositeClip) != 1) {
		miFillPolygon (pDrawable, pGC, shape, mode, count, ptsIn);
		return;
	}
	origin = *((int *) &pDrawable->x);
	origin -= (origin & 0x8000) << 1;
	extents = &pGC->pCompositeClip->extents;
	vertex1 = *((int *) &extents->x1) - origin;
	vertex2 = *((int *) &extents->x2) - origin - 0x00010001;
	clip = 0;
	y = 32767;
	maxy = 0;
	vertex2p = (int *) ptsIn;
	endp = vertex2p + count;
	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 (y == maxy)
		return;

	if (clip & 0x80008000) {
		miFillPolygon (pDrawable, pGC, shape, mode, vertex2p - (int *) ptsIn, ptsIn);
		return;
	}

	afbGetPixelWidthSizeDepthAndPointer(pDrawable, nlwidth, sizeDst, depthDst,
													 addrl);
	rrops = devPriv->rrops;
	addrl = afbScanlineDelta(addrl, y + pDrawable->y, nlwidth);
	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 & PIM;
			l -= c;
			l = l >> PWSH;
			addr = addrl + l;
			if (c + nmiddle < PPW) {
				mask = SCRRIGHT (bits,c) ^ SCRRIGHT (bits,c+nmiddle);
				for (pdst = addr, d = 0; d < depthDst; d++, pdst += sizeDst) {	/* @@@ NEXT PLANE @@@ */
					switch (rrops[d]) {
						case RROP_BLACK:
							*pdst &= ~mask;
							break;
						case RROP_WHITE:
							*pdst |= mask;
							break;
						case RROP_INVERT:
							*pdst ^= mask;
							break;
						case RROP_NOP:
							break;
					}
				}
			} else {
				if (c) {
					mask = SCRRIGHT(bits, c);
					for (pdst = addr, d = 0; d < depthDst; d++, pdst += sizeDst) {	/* @@@ NEXT PLANE @@@ */
						switch (rrops[d]) {
							case RROP_BLACK:
								*pdst &= ~mask;
								break;
							case RROP_WHITE:
								*pdst |= mask;
								break;
							case RROP_INVERT:
								*pdst ^= mask;
								break;
							case RROP_NOP:
								break;
						}
					}
					nmiddle += c - PPW;
					addr++;
				}
				nmiddle >>= PWSH;
				mask = ~SCRRIGHT(bits, r & PIM);

				for (d = 0; d < depthDst; d++, addr += sizeDst) {	/* @@@ NEXT PLANE @@@ */
					n = nmiddle;
					pdst = addr;

					switch (rrops[d]) {
						case RROP_BLACK:
							Duff (n, *pdst++ = 0;)
							if (mask)
								*pdst &= ~mask;
							break;
						case RROP_WHITE:
							Duff (n, *pdst++ = ~0;);
							if (mask)
								*pdst |= mask;
							break;
						case RROP_INVERT:
							Duff (n, *pdst++ ^= ~0;);
							if (mask)
								*pdst ^= mask;
							break;
						case RROP_NOP:
							break;
					}
				}
			}
			if (!--h)
				break;
			afbScanlineInc(addrl, nlwidth);
			Step(x1,dx1,dy1,e1,sign1,step1)
			Step(x2,dx2,dy2,e2,sign2,step2)
		}
		if (y == maxy)
			break;
		afbScanlineInc(addrl, nlwidth);
	}
}