diff options
Diffstat (limited to 'xorg-server/mi/mifpolycon.c')
| -rw-r--r-- | xorg-server/mi/mifpolycon.c | 529 |
1 files changed, 249 insertions, 280 deletions
diff --git a/xorg-server/mi/mifpolycon.c b/xorg-server/mi/mifpolycon.c index 9d776201c..b1337315b 100644 --- a/xorg-server/mi/mifpolycon.c +++ b/xorg-server/mi/mifpolycon.c @@ -1,280 +1,249 @@ -/***********************************************************
-
-Copyright 1987, 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.
-
-
-Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
-
- All Rights Reserved
-
-Permission to use, copy, modify, and distribute this software and its
-documentation for any purpose and without fee is hereby granted,
-provided that the above copyright notice appear in all copies and that
-both that copyright notice and this permission notice appear in
-supporting documentation, and that the name of Digital not be
-used in advertising or publicity pertaining to distribution of the
-software without specific, written prior permission.
-
-DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
-ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
-DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
-ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
-WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
-ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
-SOFTWARE.
-
-******************************************************************/
-#ifdef HAVE_DIX_CONFIG_H
-#include <dix-config.h>
-#endif
-
-#include <math.h>
-#include <X11/X.h>
-#include "gcstruct.h"
-#include "windowstr.h"
-#include "pixmapstr.h"
-#include "mifpoly.h"
-
-static int GetFPolyYBounds(SppPointPtr pts, int n, double yFtrans,
- int *by, int *ty);
-
-/*
- * Written by Todd Newman; April. 1987.
- *
- * Fill a convex polygon. If the given polygon
- * is not convex, then the result is undefined.
- * The algorithm is to order the edges from smallest
- * y to largest by partitioning the array into a left
- * edge list and a right edge list. The algorithm used
- * to traverse each edge is digital differencing analyzer
- * line algorithm with y as the major axis. There's some funny linear
- * interpolation involved because of the subpixel postioning.
- */
-void
-miFillSppPoly(
- DrawablePtr dst,
- GCPtr pgc,
- int count, /* number of points */
- SppPointPtr ptsIn, /* the points */
- int xTrans, int yTrans, /* Translate each point by this */
- double xFtrans,
- double yFtrans /* translate before conversion
- by this amount. This provides
- a mechanism to match rounding
- errors with any shape that must
- meet the polygon exactly.
- */
- )
-{
- double xl = 0.0, xr = 0.0, /* x vals of left and right edges */
- ml = 0.0, /* left edge slope */
- mr = 0.0, /* right edge slope */
- dy, /* delta y */
- i; /* loop counter */
- int y, /* current scanline */
- j,
- imin, /* index of vertex with smallest y */
- ymin, /* y-extents of polygon */
- ymax,
- *width,
- *FirstWidth, /* output buffer */
- *Marked; /* set if this vertex has been used */
- int left, right, /* indices to first endpoints */
- nextleft,
- nextright; /* indices to second endpoints */
- DDXPointPtr ptsOut,
- FirstPoint; /* output buffer */
-
- if (pgc->miTranslate)
- {
- xTrans += dst->x;
- yTrans += dst->y;
- }
-
- imin = GetFPolyYBounds(ptsIn, count, yFtrans, &ymin, &ymax);
-
- y = ymax - ymin + 1;
- if ((count < 3) || (y <= 0))
- return;
- ptsOut = FirstPoint = malloc(sizeof(DDXPointRec) * y);
- width = FirstWidth = malloc(sizeof(int) * y);
- Marked = malloc(sizeof(int) * count);
-
- if(!ptsOut || !width || !Marked)
- {
- free(Marked);
- free(width);
- free(ptsOut);
- return;
- }
-
- for(j = 0; j < count; j++)
- Marked[j] = 0;
- nextleft = nextright = imin;
- Marked[imin] = -1;
- y = ICEIL(ptsIn[nextleft].y + yFtrans);
-
- /*
- * loop through all edges of the polygon
- */
- do
- {
- /* add a left edge if we need to */
- if ((y > (ptsIn[nextleft].y + yFtrans) ||
- ISEQUAL(y, ptsIn[nextleft].y + yFtrans)) &&
- Marked[nextleft] != 1)
- {
- Marked[nextleft]++;
- left = nextleft++;
-
- /* find the next edge, considering the end conditions */
- if (nextleft >= count)
- nextleft = 0;
-
- /* now compute the starting point and slope */
- dy = ptsIn[nextleft].y - ptsIn[left].y;
- if (dy != 0.0)
- {
- ml = (ptsIn[nextleft].x - ptsIn[left].x) / dy;
- dy = y - (ptsIn[left].y + yFtrans);
- xl = (ptsIn[left].x + xFtrans) + ml * max(dy, 0);
- }
- }
-
- /* add a right edge if we need to */
- if ((y > ptsIn[nextright].y + yFtrans) ||
- (ISEQUAL(y, ptsIn[nextright].y + yFtrans)
- && Marked[nextright] != 1))
- {
- Marked[nextright]++;
- right = nextright--;
-
- /* find the next edge, considering the end conditions */
- if (nextright < 0)
- nextright = count - 1;
-
- /* now compute the starting point and slope */
- dy = ptsIn[nextright].y - ptsIn[right].y;
- if (dy != 0.0)
- {
- mr = (ptsIn[nextright].x - ptsIn[right].x) / dy;
- dy = y - (ptsIn[right].y + yFtrans);
- xr = (ptsIn[right].x + xFtrans) + mr * max(dy, 0);
- }
- }
-
-
- /*
- * generate scans to fill while we still have
- * a right edge as well as a left edge.
- */
- i = (min(ptsIn[nextleft].y, ptsIn[nextright].y) + yFtrans) - y;
-
- if (i < EPSILON)
- {
- if(Marked[nextleft] && Marked[nextright])
- {
- /* Arrgh, we're trapped! (no more points)
- * Out, we've got to get out of here before this decadence saps
- * our will completely! */
- break;
- }
- continue;
- }
- else
- {
- j = (int) i;
- if(!j)
- j++;
- }
- while (j > 0)
- {
- int cxl, cxr;
-
- ptsOut->y = (y) + yTrans;
-
- cxl = ICEIL(xl);
- cxr = ICEIL(xr);
- /* reverse the edges if necessary */
- if (xl < xr)
- {
- *(width++) = cxr - cxl;
- (ptsOut++)->x = cxl + xTrans;
- }
- else
- {
- *(width++) = cxl - cxr;
- (ptsOut++)->x = cxr + xTrans;
- }
- y++;
-
- /* increment down the edges */
- xl += ml;
- xr += mr;
- j--;
- }
- } while (y <= ymax);
-
- /* Finally, fill the spans we've collected */
- (*pgc->ops->FillSpans)(dst, pgc,
- ptsOut-FirstPoint, FirstPoint, FirstWidth, 1);
- free(Marked);
- free(FirstWidth);
- free(FirstPoint);
-}
-
-
-/* Find the index of the point with the smallest y.also return the
- * smallest and largest y */
-static
-int
-GetFPolyYBounds(
- SppPointPtr pts,
- int n,
- double yFtrans,
- int *by,
- int *ty)
-{
- SppPointPtr ptMin;
- double ymin, ymax;
- SppPointPtr ptsStart = pts;
-
- ptMin = pts;
- ymin = ymax = (pts++)->y;
-
- while (--n > 0) {
- if (pts->y < ymin)
- {
- ptMin = pts;
- ymin = pts->y;
- }
- if(pts->y > ymax)
- ymax = pts->y;
-
- pts++;
- }
-
- *by = ICEIL(ymin + yFtrans);
- *ty = ICEIL(ymax + yFtrans - 1);
- return ptMin-ptsStart;
-}
+/*********************************************************** + +Copyright 1987, 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. + +Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts. + + All Rights Reserved + +Permission to use, copy, modify, and distribute this software and its +documentation for any purpose and without fee is hereby granted, +provided that the above copyright notice appear in all copies and that +both that copyright notice and this permission notice appear in +supporting documentation, and that the name of Digital not be +used in advertising or publicity pertaining to distribution of the +software without specific, written prior permission. + +DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING +ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL +DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR +ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, +WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, +ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS +SOFTWARE. + +******************************************************************/ +#ifdef HAVE_DIX_CONFIG_H +#include <dix-config.h> +#endif + +#include <math.h> +#include <X11/X.h> +#include "gcstruct.h" +#include "windowstr.h" +#include "pixmapstr.h" +#include "mifpoly.h" + +static int GetFPolyYBounds(SppPointPtr pts, int n, double yFtrans, + int *by, int *ty); + +/* + * Written by Todd Newman; April. 1987. + * + * Fill a convex polygon. If the given polygon + * is not convex, then the result is undefined. + * The algorithm is to order the edges from smallest + * y to largest by partitioning the array into a left + * edge list and a right edge list. The algorithm used + * to traverse each edge is digital differencing analyzer + * line algorithm with y as the major axis. There's some funny linear + * interpolation involved because of the subpixel postioning. + */ +void +miFillSppPoly(DrawablePtr dst, GCPtr pgc, int count, /* number of points */ + SppPointPtr ptsIn, /* the points */ + int xTrans, int yTrans, /* Translate each point by this */ + double xFtrans, double yFtrans /* translate before conversion + by this amount. This provides + a mechanism to match rounding + errors with any shape that must + meet the polygon exactly. + */ + ) +{ + double xl = 0.0, xr = 0.0, /* x vals of left and right edges */ + ml = 0.0, /* left edge slope */ + mr = 0.0, /* right edge slope */ + dy, /* delta y */ + i; /* loop counter */ + int y, /* current scanline */ + j, imin, /* index of vertex with smallest y */ + ymin, /* y-extents of polygon */ + ymax, *width, *FirstWidth, /* output buffer */ + *Marked; /* set if this vertex has been used */ + int left, right, /* indices to first endpoints */ + nextleft, nextright; /* indices to second endpoints */ + DDXPointPtr ptsOut, FirstPoint; /* output buffer */ + + if (pgc->miTranslate) { + xTrans += dst->x; + yTrans += dst->y; + } + + imin = GetFPolyYBounds(ptsIn, count, yFtrans, &ymin, &ymax); + + y = ymax - ymin + 1; + if ((count < 3) || (y <= 0)) + return; + ptsOut = FirstPoint = malloc(sizeof(DDXPointRec) * y); + width = FirstWidth = malloc(sizeof(int) * y); + Marked = malloc(sizeof(int) * count); + + if (!ptsOut || !width || !Marked) { + free(Marked); + free(width); + free(ptsOut); + return; + } + + for (j = 0; j < count; j++) + Marked[j] = 0; + nextleft = nextright = imin; + Marked[imin] = -1; + y = ICEIL(ptsIn[nextleft].y + yFtrans); + + /* + * loop through all edges of the polygon + */ + do { + /* add a left edge if we need to */ + if ((y > (ptsIn[nextleft].y + yFtrans) || + ISEQUAL(y, ptsIn[nextleft].y + yFtrans)) && + Marked[nextleft] != 1) { + Marked[nextleft]++; + left = nextleft++; + + /* find the next edge, considering the end conditions */ + if (nextleft >= count) + nextleft = 0; + + /* now compute the starting point and slope */ + dy = ptsIn[nextleft].y - ptsIn[left].y; + if (dy != 0.0) { + ml = (ptsIn[nextleft].x - ptsIn[left].x) / dy; + dy = y - (ptsIn[left].y + yFtrans); + xl = (ptsIn[left].x + xFtrans) + ml * max(dy, 0); + } + } + + /* add a right edge if we need to */ + if ((y > ptsIn[nextright].y + yFtrans) || + (ISEQUAL(y, ptsIn[nextright].y + yFtrans) + && Marked[nextright] != 1)) { + Marked[nextright]++; + right = nextright--; + + /* find the next edge, considering the end conditions */ + if (nextright < 0) + nextright = count - 1; + + /* now compute the starting point and slope */ + dy = ptsIn[nextright].y - ptsIn[right].y; + if (dy != 0.0) { + mr = (ptsIn[nextright].x - ptsIn[right].x) / dy; + dy = y - (ptsIn[right].y + yFtrans); + xr = (ptsIn[right].x + xFtrans) + mr * max(dy, 0); + } + } + + /* + * generate scans to fill while we still have + * a right edge as well as a left edge. + */ + i = (min(ptsIn[nextleft].y, ptsIn[nextright].y) + yFtrans) - y; + + if (i < EPSILON) { + if (Marked[nextleft] && Marked[nextright]) { + /* Arrgh, we're trapped! (no more points) + * Out, we've got to get out of here before this decadence saps + * our will completely! */ + break; + } + continue; + } + else { + j = (int) i; + if (!j) + j++; + } + while (j > 0) { + int cxl, cxr; + + ptsOut->y = (y) + yTrans; + + cxl = ICEIL(xl); + cxr = ICEIL(xr); + /* reverse the edges if necessary */ + if (xl < xr) { + *(width++) = cxr - cxl; + (ptsOut++)->x = cxl + xTrans; + } + else { + *(width++) = cxl - cxr; + (ptsOut++)->x = cxr + xTrans; + } + y++; + + /* increment down the edges */ + xl += ml; + xr += mr; + j--; + } + } while (y <= ymax); + + /* Finally, fill the spans we've collected */ + (*pgc->ops->FillSpans) (dst, pgc, + ptsOut - FirstPoint, FirstPoint, FirstWidth, 1); + free(Marked); + free(FirstWidth); + free(FirstPoint); +} + +/* Find the index of the point with the smallest y.also return the + * smallest and largest y */ +static + int +GetFPolyYBounds(SppPointPtr pts, int n, double yFtrans, int *by, int *ty) +{ + SppPointPtr ptMin; + double ymin, ymax; + SppPointPtr ptsStart = pts; + + ptMin = pts; + ymin = ymax = (pts++)->y; + + while (--n > 0) { + if (pts->y < ymin) { + ptMin = pts; + ymin = pts->y; + } + if (pts->y > ymax) + ymax = pts->y; + + pts++; + } + + *by = ICEIL(ymin + yFtrans); + *ty = ICEIL(ymax + yFtrans - 1); + return ptMin - ptsStart; +} |