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-rw-r--r--hw/xfree86/xf4bpp/mfbzerarc.c266
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diff --git a/hw/xfree86/xf4bpp/mfbzerarc.c b/hw/xfree86/xf4bpp/mfbzerarc.c
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+/* $XFree86: xc/programs/Xserver/hw/xfree86/xf4bpp/mfbzerarc.c,v 1.5 2003/02/18 21:29:59 tsi Exp $ */
+
+/************************************************************
+
+Copyright (c) 1989 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.
+
+********************************************************/
+/* GJA -- Took mfb code and modified it. */
+
+/* $XConsortium: mfbzerarc.c /main/4 1996/02/21 17:56:52 kaleb $ */
+
+/* Derived from:
+ * "Algorithm for drawing ellipses or hyperbolae with a digital plotter"
+ * by M. L. V. Pitteway
+ * The Computer Journal, November 1967, Volume 10, Number 3, pp. 282-289
+ */
+
+#include "xf4bpp.h"
+#include "OScompiler.h"
+#include "mfbmap.h"
+#include "mfb.h"
+#include "maskbits.h"
+#include "mi.h"
+#include "mizerarc.h"
+#include "wm3.h"
+
+#include "xf86str.h" /* for pScrn->vtSema */
+extern ScrnInfoPtr *xf86Screens;
+
+/*
+ * Note, LEFTMOST must be the bit leftmost in the actual screen
+ * representation. This depends on both BITMAP_BIT_ORDER and
+ * IMAGE_BYTE_ORDER
+ * DHD 10/92
+ */
+
+#if (BITMAP_BIT_ORDER == MSBFirst)
+#if (IMAGE_BYTE_ORDER == MSBFirst)
+#define LEFTMOST ((unsigned int) 0x80000000)
+#else
+#define LEFTMOST ((unsigned int) 0x80)
+#endif
+#else
+#if (IMAGE_BYTE_ORDER == LSBFirst)
+#define LEFTMOST ((unsigned int) 1)
+#else
+#define LEFTMOST ((unsigned int) 0x1000000)
+#endif
+#endif
+
+#define PixelateWhite(addr,off) \
+{ \
+ register int *tmpaddr = &((addr)[(off)>>PWSH]); \
+ UPDRW(tmpaddr,SCRRIGHT (LEFTMOST, ((off) & PIM))); \
+}
+#define PixelateBlack(addr,off) \
+{ \
+ register int *tmpaddr = &((addr)[(off)>>PWSH]); \
+ UPDRW(tmpaddr,~(SCRRIGHT (LEFTMOST, ((off) & PIM)))); \
+}
+
+#define Pixelate(base,off) \
+{ \
+ paddr = base + ((off)>>PWSH); \
+ pmask = SCRRIGHT(LEFTMOST, (off) & PIM); \
+ UPDRW(paddr,(pixel & pmask)); \
+}
+
+#define DoPix(bit,base,off) if (msk & bit) Pixelate(base,off);
+
+static void
+v16ZeroArcSS
+(
+ DrawablePtr pDraw,
+ GCPtr pGC,
+ xArc *arc
+)
+{
+ miZeroArcRec info;
+ Bool do360;
+ register int x, y, a, b, d, msk;
+ register int k1, k3, dx, dy;
+ int *addrl;
+ int *yorgl, *yorgol;
+ unsigned long pixel;
+ int nlwidth, yoffset, dyoffset;
+ int pmask;
+ register int *paddr;
+
+ if (((mfbPrivGC *)(pGC->devPrivates[mfbGCPrivateIndex].ptr))->rop ==
+ RROP_BLACK)
+ pixel = 0;
+ else
+ pixel = ~0UL;
+
+ if (pDraw->type == DRAWABLE_WINDOW)
+ {
+ addrl = (int *)
+ (((PixmapPtr)(pDraw->pScreen->devPrivate))->devPrivate.ptr);
+ nlwidth = (int)
+ (((PixmapPtr)(pDraw->pScreen->devPrivate))->devKind) >> 2;
+ }
+ else
+ {
+ addrl = (int *)(((PixmapPtr)pDraw)->devPrivate.ptr);
+ nlwidth = (int)(((PixmapPtr)pDraw)->devKind) >> 2;
+ }
+
+ do360 = miZeroArcSetup(arc, &info, TRUE);
+ yorgl = addrl + ((info.yorg + pDraw->y) * nlwidth);
+ yorgol = addrl + ((info.yorgo + pDraw->y) * nlwidth);
+ info.xorg += pDraw->x;
+ info.xorgo += pDraw->x;
+ MIARCSETUP();
+ yoffset = y ? nlwidth : 0;
+ dyoffset = 0;
+ msk = info.initialMask;
+ if (!(arc->width & 1))
+ {
+ DoPix(2, yorgl, info.xorgo);
+ DoPix(8, yorgol, info.xorgo);
+ }
+ if (!info.end.x || !info.end.y)
+ {
+ msk = info.end.mask;
+ info.end = info.altend;
+ }
+ if (do360 && (arc->width == arc->height) && !(arc->width & 1))
+ {
+ int xoffset = nlwidth;
+ int *yorghl = yorgl + (info.h * nlwidth);
+ int xorghp = info.xorg + info.h;
+ int xorghn = info.xorg - info.h;
+
+ while (1)
+ {
+ PixelateWhite(yorgl + yoffset, info.xorg + x);
+ PixelateWhite(yorgl + yoffset, info.xorg - x);
+ PixelateWhite(yorgol- yoffset, info.xorg - x);
+ PixelateWhite(yorgol - yoffset, info.xorg + x);
+ if (a < 0)
+ break;
+ PixelateWhite(yorghl - xoffset, xorghp - y);
+ PixelateWhite(yorghl - xoffset, xorghn + y);
+ PixelateWhite(yorghl + xoffset, xorghn + y);
+ PixelateWhite(yorghl + xoffset, xorghp - y);
+ xoffset += nlwidth;
+ MIARCCIRCLESTEP(yoffset += nlwidth;);
+ }
+ x = info.w;
+ yoffset = info.h * nlwidth;
+ }
+ else if (do360)
+ {
+ while (y < info.h || x < info.w)
+ {
+ MIARCOCTANTSHIFT(dyoffset = nlwidth;);
+ Pixelate(yorgl + yoffset, info.xorg + x);
+ Pixelate(yorgl + yoffset, info.xorgo - x);
+ Pixelate(yorgol - yoffset, info.xorgo - x);
+ Pixelate(yorgol - yoffset, info.xorg + x);
+ MIARCSTEP(yoffset += dyoffset;, yoffset += nlwidth;);
+ }
+ }
+ else
+ {
+ while (y < info.h || x < info.w)
+ {
+ MIARCOCTANTSHIFT(dyoffset = nlwidth;);
+ if ((x == info.start.x) || (y == info.start.y))
+ {
+ msk = info.start.mask;
+ info.start = info.altstart;
+ }
+ DoPix(1, yorgl + yoffset, info.xorg + x);
+ DoPix(2, yorgl + yoffset, info.xorgo - x);
+ DoPix(4, yorgol - yoffset, info.xorgo - x);
+ DoPix(8, yorgol - yoffset, info.xorg + x);
+ if ((x == info.end.x) || (y == info.end.y))
+ {
+ msk = info.end.mask;
+ info.end = info.altend;
+ }
+ MIARCSTEP(yoffset += dyoffset;, yoffset += nlwidth;);
+ }
+ }
+ if ((x == info.start.x) || (y == info.start.y))
+ msk = info.start.mask;
+ DoPix(1, yorgl + yoffset, info.xorg + x);
+ DoPix(4, yorgol - yoffset, info.xorgo - x);
+ if (arc->height & 1)
+ {
+ DoPix(2, yorgl + yoffset, info.xorgo - x);
+ DoPix(8, yorgol - yoffset, info.xorg + x);
+ }
+}
+
+static void
+xf4bppZeroPolyArcSS
+(
+ DrawablePtr pDraw,
+ GCPtr pGC,
+ int narcs,
+ xArc *parcs
+)
+{
+ register xArc *arc;
+ register int i;
+ BoxRec box;
+ RegionPtr cclip;
+
+ if (!pGC->planemask & 0x0F)
+ return;
+ cclip = pGC->pCompositeClip;
+ for (arc = parcs, i = narcs; --i >= 0; arc++)
+ {
+ if (miCanZeroArc(arc))
+ {
+ box.x1 = arc->x + pDraw->x;
+ box.y1 = arc->y + pDraw->y;
+ box.x2 = box.x1 + (int)arc->width + 1;
+ box.y2 = box.y1 + (int)arc->height + 1;
+ if (RECT_IN_REGION(pDraw->pScreen, cclip, &box) == rgnIN)
+ v16ZeroArcSS(pDraw, pGC, arc);
+ else
+ miZeroPolyArc(pDraw, pGC, 1, arc);
+ }
+ else
+ miPolyArc(pDraw, pGC, 1, arc);
+ }
+}
+
+void
+xf4bppZeroPolyArc(pDraw, pGC, narcs, parcs)
+ DrawablePtr pDraw;
+ GCPtr pGC;
+ int narcs;
+ xArc *parcs;
+{
+ if ( !xf86Screens[pDraw->pScreen->myNum]->vtSema ) {
+ miZeroPolyArc(pDraw, pGC, narcs, parcs);
+ } else {
+ DO_WM3(pGC,xf4bppZeroPolyArcSS(pDraw, pGC, narcs, parcs));
+ }
+}
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