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-rw-r--r--mfb/mfbfillarc.c328
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diff --git a/mfb/mfbfillarc.c b/mfb/mfbfillarc.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: mfbfillarc.c,v 1.4 2001/02/09 02:05:18 xorgcvs Exp $ */
+
+#include "X.h"
+#include "Xprotostr.h"
+#include "miscstruct.h"
+#include "gcstruct.h"
+#include "pixmapstr.h"
+#include "scrnintstr.h"
+#include "mfb.h"
+#include "maskbits.h"
+#include "mifillarc.h"
+#include "mi.h"
+
+static void
+mfbFillEllipseSolid(pDraw, arc, rop)
+ DrawablePtr pDraw;
+ xArc *arc;
+ register int rop;
+{
+ int x, y, e;
+ int yk, xk, ym, xm, dx, dy, xorg, yorg;
+ register int slw;
+ miFillArcRec info;
+ PixelType *addrlt, *addrlb;
+ register PixelType *addrl;
+ register int n;
+ int nlwidth;
+ register int xpos;
+ PixelType startmask, endmask;
+ int nlmiddle;
+
+ mfbGetPixelWidthAndPointer(pDraw, nlwidth, addrlt);
+ 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 = mfbScanlineOffset(addrlt, (xpos >> PWSH));
+ if (((xpos & PIM) + slw) < PPW)
+ {
+ maskpartialbits(xpos, slw, startmask);
+ if (rop == RROP_BLACK)
+ *addrl &= ~startmask;
+ else if (rop == RROP_WHITE)
+ *addrl |= startmask;
+ else
+ *addrl ^= startmask;
+ if (miFillArcLower(slw))
+ {
+ addrl = mfbScanlineOffset(addrlb, (xpos >> PWSH));
+ if (rop == RROP_BLACK)
+ *addrl &= ~startmask;
+ else if (rop == RROP_WHITE)
+ *addrl |= startmask;
+ else
+ *addrl ^= startmask;
+ }
+ continue;
+ }
+ maskbits(xpos, slw, startmask, endmask, nlmiddle);
+ if (startmask)
+ {
+ if (rop == RROP_BLACK)
+ *addrl++ &= ~startmask;
+ else if (rop == RROP_WHITE)
+ *addrl++ |= startmask;
+ else
+ *addrl++ ^= startmask;
+ }
+ n = nlmiddle;
+ if (rop == RROP_BLACK)
+ while (n--)
+ *addrl++ = 0;
+ else if (rop == RROP_WHITE)
+ while (n--)
+ *addrl++ = ~0;
+ else
+ while (n--)
+ *addrl++ ^= ~0;
+ if (endmask)
+ {
+ if (rop == RROP_BLACK)
+ *addrl &= ~endmask;
+ else if (rop == RROP_WHITE)
+ *addrl |= endmask;
+ else
+ *addrl ^= endmask;
+ }
+ if (!miFillArcLower(slw))
+ continue;
+ addrl = mfbScanlineOffset(addrlb, (xpos >> PWSH));
+ if (startmask)
+ {
+ if (rop == RROP_BLACK)
+ *addrl++ &= ~startmask;
+ else if (rop == RROP_WHITE)
+ *addrl++ |= startmask;
+ else
+ *addrl++ ^= startmask;
+ }
+ n = nlmiddle;
+ if (rop == RROP_BLACK)
+ while (n--)
+ *addrl++ = 0;
+ else if (rop == RROP_WHITE)
+ while (n--)
+ *addrl++ = ~0;
+ else
+ while (n--)
+ *addrl++ ^= ~0;
+ if (endmask)
+ {
+ if (rop == RROP_BLACK)
+ *addrl &= ~endmask;
+ else if (rop == RROP_WHITE)
+ *addrl |= endmask;
+ else
+ *addrl ^= endmask;
+ }
+ }
+}
+
+#define FILLSPAN(xl,xr,addr) \
+ if (xr >= xl) \
+ { \
+ width = xr - xl + 1; \
+ addrl = mfbScanlineOffset(addr, (xl >> PWSH)); \
+ if (((xl & PIM) + width) < PPW) \
+ { \
+ maskpartialbits(xl, width, startmask); \
+ if (rop == RROP_BLACK) \
+ *addrl &= ~startmask; \
+ else if (rop == RROP_WHITE) \
+ *addrl |= startmask; \
+ else \
+ *addrl ^= startmask; \
+ } \
+ else \
+ { \
+ maskbits(xl, width, startmask, endmask, nlmiddle); \
+ if (startmask) \
+ { \
+ if (rop == RROP_BLACK) \
+ *addrl++ &= ~startmask; \
+ else if (rop == RROP_WHITE) \
+ *addrl++ |= startmask; \
+ else \
+ *addrl++ ^= startmask; \
+ } \
+ n = nlmiddle; \
+ if (rop == RROP_BLACK) \
+ while (n--) \
+ *addrl++ = 0; \
+ else if (rop == RROP_WHITE) \
+ while (n--) \
+ *addrl++ = ~0; \
+ else \
+ while (n--) \
+ *addrl++ ^= ~0; \
+ if (endmask) \
+ { \
+ if (rop == RROP_BLACK) \
+ *addrl &= ~endmask; \
+ else if (rop == RROP_WHITE) \
+ *addrl |= endmask; \
+ else \
+ *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
+mfbFillArcSliceSolidCopy(pDraw, pGC, arc, rop)
+ DrawablePtr pDraw;
+ GCPtr pGC;
+ xArc *arc;
+ register int rop;
+{
+ register PixelType *addrl;
+ register int n;
+ int yk, xk, ym, xm, dx, dy, xorg, yorg, slw;
+ register int x, y, e;
+ miFillArcRec info;
+ miArcSliceRec slice;
+ int xl, xr, xc;
+ PixelType *addrlt, *addrlb;
+ int nlwidth;
+ int width;
+ PixelType startmask, endmask;
+ int nlmiddle;
+
+ mfbGetPixelWidthAndPointer(pDraw, nlwidth, addrlt);
+ miFillArcSetup(arc, &info);
+ miFillArcSliceSetup(arc, &slice, pGC);
+ MIFILLARCSETUP();
+ xorg += pDraw->x;
+ yorg += pDraw->y;
+ addrlb = addrlt;
+ addrlt = mfbScanlineDeltaNoBankSwitch(addrlt, yorg - y, nlwidth);
+ addrlb = mfbScanlineDeltaNoBankSwitch(addrlb, yorg + y + dy, nlwidth);
+ slice.edge1.x += pDraw->x;
+ slice.edge2.x += pDraw->x;
+ while (y > 0)
+ {
+ mfbScanlineIncNoBankSwitch(addrlt, nlwidth);
+ mfbScanlineIncNoBankSwitch(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
+mfbPolyFillArcSolid(pDraw, pGC, narcs, parcs)
+ register DrawablePtr pDraw;
+ GCPtr pGC;
+ int narcs;
+ xArc *parcs;
+{
+ mfbPrivGC *priv;
+ register xArc *arc;
+ register int i;
+ BoxRec box;
+ int x2, y2;
+ RegionPtr cclip;
+ int rop;
+
+ priv = (mfbPrivGC *) pGC->devPrivates[mfbGCPrivateIndex].ptr;
+ rop = priv->rop;
+ if ((rop == RROP_NOP) || !(pGC->planemask & 1))
+ return;
+ cclip = priv->pCompositeClip;
+ 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))
+ mfbFillEllipseSolid(pDraw, arc, rop);
+ else
+ mfbFillArcSliceSolidCopy(pDraw, pGC, arc, rop);
+ continue;
+ }
+ }
+ miPolyFillArc(pDraw, pGC, 1, arc);
+ }
+}
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