R6.6 is the Xorg base-line

1 files changed, 218 insertions, 0 deletions

diff --git a/cfb/cfbzerarc.c b/cfb/cfbzerarc.c
new file mode 100644
index 000000000..37b7023d5
--- /dev/null
+++ b/cfb/cfbzerarc.c
@@ -0,0 +1,218 @@
+/************************************************************
+
+Copyright 1989, 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.
+
+********************************************************/
+
+/* $Xorg: cfbzerarc.c,v 1.4 2001/02/09 02:04:39 xorgcvs Exp $ */
+
+/* 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 "X.h"
+#include "Xprotostr.h"
+#include "miscstruct.h"
+#include "gcstruct.h"
+#include "pixmapstr.h"
+#include "scrnintstr.h"
+#include "cfb.h"
+#include "cfbmskbits.h"
+#include "mizerarc.h"
+#include "cfbrrop.h"
+#include "mi.h"
+
+#ifdef PIXEL_ADDR
+
+static void
+RROP_NAME(cfbZeroArcSS8) (pDraw, pGC, arc)
+    DrawablePtr pDraw;
+    GCPtr pGC;
+    xArc *arc;
+{
+    miZeroArcRec info;
+    Bool do360;
+    register int x;
+    PixelType *addrp;
+    register PixelType *yorgp, *yorgop;
+    RROP_DECLARE
+    register int yoffset;
+    int npwidth, dyoffset;
+    register int y, a, b, d, mask;
+    register int k1, k3, dx, dy;
+
+    cfbGetPixelWidthAndPointer(pDraw,npwidth, addrp)
+
+    RROP_FETCH_GC (pGC);
+    do360 = miZeroArcSetup(arc, &info, TRUE);
+    yorgp = addrp + ((info.yorg + pDraw->y) * npwidth);
+    yorgop = addrp + ((info.yorgo + pDraw->y) * npwidth);
+    info.xorg += pDraw->x;
+    info.xorgo += pDraw->x;
+    MIARCSETUP();
+    yoffset = y ? npwidth : 0;
+    dyoffset = 0;
+    mask = info.initialMask;
+    if (!(arc->width & 1))
+    {
+	if (mask & 2)
+	    RROP_SOLID((yorgp + info.xorgo));
+	if (mask & 8)
+	    RROP_SOLID((yorgop + info.xorgo));
+    }
+    if (!info.end.x || !info.end.y)
+    {
+	mask = info.end.mask;
+	info.end = info.altend;
+    }
+    if (do360 && (arc->width == arc->height) && !(arc->width & 1))
+    {
+	register int xoffset = npwidth;
+	PixelType *yorghb = yorgp + (info.h * npwidth) + info.xorg;
+	PixelType *yorgohb = yorghb - info.h;
+
+	yorgp += info.xorg;
+	yorgop += info.xorg;
+	yorghb += info.h;
+	while (1)
+	{
+	    RROP_SOLID(yorgp + yoffset + x);
+	    RROP_SOLID(yorgp + yoffset - x);
+	    RROP_SOLID(yorgop - yoffset - x);
+	    RROP_SOLID(yorgop - yoffset + x);
+	    if (a < 0)
+		break;
+	    RROP_SOLID(yorghb - xoffset - y);
+	    RROP_SOLID(yorgohb - xoffset + y);
+	    RROP_SOLID(yorgohb + xoffset + y);
+	    RROP_SOLID(yorghb + xoffset - y);
+	    xoffset += npwidth;
+	    MIARCCIRCLESTEP(yoffset += npwidth;);
+	}
+	yorgp -= info.xorg;
+	yorgop -= info.xorg;
+	x = info.w;
+	yoffset = info.h * npwidth;
+    }
+    else if (do360)
+    {
+	while (y < info.h || x < info.w)
+	{
+	    MIARCOCTANTSHIFT(dyoffset = npwidth;);
+	    RROP_SOLID(yorgp + yoffset + info.xorg + x);
+	    RROP_SOLID(yorgp + yoffset + info.xorgo - x);
+	    RROP_SOLID(yorgop - yoffset + info.xorgo - x);
+	    RROP_SOLID(yorgop - yoffset + info.xorg + x);
+	    MIARCSTEP(yoffset += dyoffset;, yoffset += npwidth;);
+	}
+    }
+    else
+    {
+	while (y < info.h || x < info.w)
+	{
+	    MIARCOCTANTSHIFT(dyoffset = npwidth;);
+	    if ((x == info.start.x) || (y == info.start.y))
+	    {
+		mask = info.start.mask;
+		info.start = info.altstart;
+	    }
+	    if (mask & 1)
+		RROP_SOLID(yorgp + yoffset + info.xorg + x);
+	    if (mask & 2)
+		RROP_SOLID(yorgp + yoffset + info.xorgo - x);
+	    if (mask & 4)
+		RROP_SOLID(yorgop - yoffset + info.xorgo - x);
+	    if (mask & 8)
+		RROP_SOLID(yorgop - yoffset + info.xorg + x);
+	    if ((x == info.end.x) || (y == info.end.y))
+	    {
+		mask = info.end.mask;
+		info.end = info.altend;
+	    }
+	    MIARCSTEP(yoffset += dyoffset;, yoffset += npwidth;);
+	}
+    }
+    if ((x == info.start.x) || (y == info.start.y))
+	mask = info.start.mask;
+    if (mask & 1)
+	RROP_SOLID(yorgp + yoffset + info.xorg + x);
+    if (mask & 4)
+	RROP_SOLID(yorgop - yoffset + info.xorgo - x);
+    if (arc->height & 1)
+    {
+	if (mask & 2)
+	    RROP_SOLID(yorgp + yoffset + info.xorgo - x);
+	if (mask & 8)
+	    RROP_SOLID(yorgop - yoffset + info.xorg + x);
+    }
+}
+
+void
+RROP_NAME (cfbZeroPolyArcSS8) (pDraw, pGC, narcs, parcs)
+    register DrawablePtr	pDraw;
+    GCPtr	pGC;
+    int		narcs;
+    xArc	*parcs;
+{
+    register xArc *arc;
+    register int i;
+    BoxRec box;
+    int x2, y2;
+    RegionPtr cclip;
+
+    cclip = cfbGetCompositeClip(pGC);
+    for (arc = parcs, i = narcs; --i >= 0; arc++)
+    {
+	if (miCanZeroArc(arc))
+	{
+	    box.x1 = arc->x + pDraw->x;
+	    box.y1 = arc->y + pDraw->y;
+ 	    /*
+ 	     * Because box.x2 and box.y2 get truncated to 16 bits, and the
+ 	     * RECT_IN_REGION test treats the resulting number as a signed
+ 	     * integer, the RECT_IN_REGION test alone can go the wrong way.
+ 	     * This can result in a server crash because the rendering
+ 	     * routines in this file deal directly with cpu addresses
+ 	     * of pixels to be stored, and do not clip or otherwise check
+ 	     * that all such addresses are within their respective pixmaps.
+ 	     * So we only allow the RECT_IN_REGION test to be used for
+ 	     * values that can be expressed correctly in a signed short.
+ 	     */
+ 	    x2 = box.x1 + (int)arc->width + 1;
+ 	    box.x2 = x2;
+ 	    y2 = box.y1 + (int)arc->height + 1;
+ 	    box.y2 = y2;
+ 	    if ( (x2 <= MAXSHORT) && (y2 <= MAXSHORT) &&
+ 		    (RECT_IN_REGION(pDraw->pScreen, cclip, &box) == rgnIN) )
+		RROP_NAME (cfbZeroArcSS8) (pDraw, pGC, arc);
+	    else
+		miZeroPolyArc(pDraw, pGC, 1, arc);
+	}
+	else
+	    miPolyArc(pDraw, pGC, 1, arc);
+    }
+}
+
+#endif