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-rw-r--r--cfb/cfbfillarc.c265
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diff --git a/cfb/cfbfillarc.c b/cfb/cfbfillarc.c
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+/************************************************************
+
+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: cfbfillarc.c,v 1.4 2001/02/09 02:04:37 xorgcvs Exp $ */
+
+#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 "mifillarc.h"
+#include "cfbrrop.h"
+#include "mi.h"
+
+/* gcc 1.35 is stupid */
+#if defined(__GNUC__) && defined(mc68020)
+#define STUPID volatile
+#else
+#define STUPID
+#endif
+
+static void
+RROP_NAME(cfbFillEllipseSolid) (pDraw, pGC, arc)
+ DrawablePtr pDraw;
+ GCPtr pGC;
+ xArc *arc;
+{
+ STUPID int x, y, e;
+ STUPID int yk, xk, ym, xm, dx, dy, xorg, yorg;
+ miFillArcRec info;
+ unsigned long *addrlt, *addrlb;
+ register unsigned long *addrl;
+ register int n;
+ int nlwidth;
+ RROP_DECLARE
+ register int xpos;
+ register int slw;
+ unsigned long startmask, endmask;
+ int nlmiddle;
+
+ cfbGetLongWidthAndPointer (pDraw, nlwidth, addrlt)
+
+ RROP_FETCH_GC(pGC);
+ miFillArcSetup(arc, &info);
+ MIFILLARCSETUP();
+ xorg += pDraw->x;
+ yorg += pDraw->y;
+ addrlb = addrlt;
+ addrlt += nlwidth * (yorg - y);
+ addrlb += nlwidth * (yorg + y + dy);
+ while (y)
+ {
+ addrlt += nlwidth;
+ addrlb -= nlwidth;
+ MIFILLARCSTEP(slw);
+ if (!slw)
+ continue;
+ xpos = xorg - x;
+ addrl = addrlt + (xpos >> PWSH);
+ if (((xpos & PIM) + slw) <= PPW)
+ {
+ maskpartialbits(xpos, slw, startmask);
+ RROP_SOLID_MASK(addrl,startmask);
+ if (miFillArcLower(slw))
+ {
+ addrl = addrlb + (xpos >> PWSH);
+ RROP_SOLID_MASK(addrl, startmask);
+ }
+ continue;
+ }
+ maskbits(xpos, slw, startmask, endmask, nlmiddle);
+ if (startmask)
+ {
+ RROP_SOLID_MASK(addrl, startmask);
+ addrl++;
+ }
+ n = nlmiddle;
+ RROP_SPAN(addrl,n)
+
+ if (endmask)
+ RROP_SOLID_MASK(addrl, endmask);
+ if (!miFillArcLower(slw))
+ continue;
+ addrl = addrlb + (xpos >> PWSH);
+ if (startmask)
+ {
+ RROP_SOLID_MASK(addrl, startmask);
+ addrl++;
+ }
+ n = nlmiddle;
+ RROP_SPAN(addrl, n);
+ if (endmask)
+ RROP_SOLID_MASK(addrl, endmask);
+ }
+}
+
+#define FILLSPAN(xl,xr,addr) \
+ if (xr >= xl) \
+ { \
+ n = xr - xl + 1; \
+ addrl = addr + (xl >> PWSH); \
+ if (((xl & PIM) + n) <= PPW) \
+ { \
+ maskpartialbits(xl, n, startmask); \
+ RROP_SOLID_MASK(addrl, startmask); \
+ } \
+ else \
+ { \
+ maskbits(xl, n, startmask, endmask, n); \
+ if (startmask) \
+ { \
+ RROP_SOLID_MASK(addrl, startmask); \
+ addrl++; \
+ } \
+ while (n--) \
+ { \
+ RROP_SOLID(addrl); \
+ ++addrl; \
+ } \
+ if (endmask) \
+ RROP_SOLID_MASK(addrl, endmask); \
+ } \
+ }
+
+#define FILLSLICESPANS(flip,addr) \
+ if (!flip) \
+ { \
+ FILLSPAN(xl, xr, addr); \
+ } \
+ else \
+ { \
+ xc = xorg - x; \
+ FILLSPAN(xc, xr, addr); \
+ xc += slw - 1; \
+ FILLSPAN(xl, xc, addr); \
+ }
+
+static void
+RROP_NAME(cfbFillArcSliceSolid)(pDraw, pGC, arc)
+ DrawablePtr pDraw;
+ GCPtr pGC;
+ xArc *arc;
+{
+ int yk, xk, ym, xm, dx, dy, xorg, yorg, slw;
+ register int x, y, e;
+ miFillArcRec info;
+ miArcSliceRec slice;
+ int xl, xr, xc;
+ unsigned long *addrlt, *addrlb;
+ register unsigned long *addrl;
+ register int n;
+ int nlwidth;
+ RROP_DECLARE
+ unsigned long startmask, endmask;
+
+ cfbGetLongWidthAndPointer (pDraw, nlwidth, addrlt)
+
+ RROP_FETCH_GC(pGC);
+ miFillArcSetup(arc, &info);
+ miFillArcSliceSetup(arc, &slice, pGC);
+ MIFILLARCSETUP();
+ xorg += pDraw->x;
+ yorg += pDraw->y;
+ addrlb = addrlt;
+ addrlt += nlwidth * (yorg - y);
+ addrlb += nlwidth * (yorg + y + dy);
+ slice.edge1.x += pDraw->x;
+ slice.edge2.x += pDraw->x;
+ while (y > 0)
+ {
+ addrlt += nlwidth;
+ addrlb -= nlwidth;
+ MIFILLARCSTEP(slw);
+ MIARCSLICESTEP(slice.edge1);
+ MIARCSLICESTEP(slice.edge2);
+ if (miFillSliceUpper(slice))
+ {
+ MIARCSLICEUPPER(xl, xr, slice, slw);
+ FILLSLICESPANS(slice.flip_top, addrlt);
+ }
+ if (miFillSliceLower(slice))
+ {
+ MIARCSLICELOWER(xl, xr, slice, slw);
+ FILLSLICESPANS(slice.flip_bot, addrlb);
+ }
+ }
+}
+
+void
+RROP_NAME(cfbPolyFillArcSolid) (pDraw, pGC, narcs, parcs)
+ DrawablePtr pDraw;
+ GCPtr pGC;
+ int narcs;
+ xArc *parcs;
+{
+ register xArc *arc;
+ register int i;
+ int x2, y2;
+ BoxRec box;
+ RegionPtr cclip;
+
+ cclip = cfbGetCompositeClip(pGC);
+ for (arc = parcs, i = narcs; --i >= 0; arc++)
+ {
+ if (miFillArcEmpty(arc))
+ continue;
+ if (miCanFillArc(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) )
+ {
+ if ((arc->angle2 >= FULLCIRCLE) ||
+ (arc->angle2 <= -FULLCIRCLE))
+ RROP_NAME(cfbFillEllipseSolid)(pDraw, pGC, arc);
+ else
+ RROP_NAME(cfbFillArcSliceSolid)(pDraw, pGC, arc);
+ continue;
+ }
+ }
+ miPolyFillArc(pDraw, pGC, 1, arc);
+ }
+}
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