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-rw-r--r--mi/mifpolycon.c207
1 files changed, 88 insertions, 119 deletions
diff --git a/mi/mifpolycon.c b/mi/mifpolycon.c
index e48686a58..b1337315b 100644
--- a/mi/mifpolycon.c
+++ b/mi/mifpolycon.c
@@ -22,7 +22,6 @@ 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
@@ -56,7 +55,7 @@ SOFTWARE.
#include "mifpoly.h"
static int GetFPolyYBounds(SppPointPtr pts, int n, double yFtrans,
- int *by, int *ty);
+ int *by, int *ty);
/*
* Written by Todd Newman; April. 1987.
@@ -71,65 +70,54 @@ static int GetFPolyYBounds(SppPointPtr pts, int n, double yFtrans,
* 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.
- */
+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;
+ 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;
+ 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;
+ if (!ptsOut || !width || !Marked) {
+ free(Marked);
+ free(width);
+ free(ptsOut);
+ return;
}
- for(j = 0; j < count; j++)
- Marked[j] = 0;
+ for (j = 0; j < count; j++)
+ Marked[j] = 0;
nextleft = nextright = imin;
Marked[imin] = -1;
y = ICEIL(ptsIn[nextleft].y + yFtrans);
@@ -137,14 +125,12 @@ miFillSppPoly(
/*
* loop through all edges of the polygon
*/
- do
- {
+ 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]++;
+ ISEQUAL(y, ptsIn[nextleft].y + yFtrans)) &&
+ Marked[nextleft] != 1) {
+ Marked[nextleft]++;
left = nextleft++;
/* find the next edge, considering the end conditions */
@@ -152,21 +138,19 @@ miFillSppPoly(
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);
- }
+ 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]++;
+ (ISEQUAL(y, ptsIn[nextright].y + yFtrans)
+ && Marked[nextright] != 1)) {
+ Marked[nextright]++;
right = nextright--;
/* find the next edge, considering the end conditions */
@@ -174,101 +158,86 @@ miFillSppPoly(
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);
- }
+ 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;
+ 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);
+ cxl = ICEIL(xl);
+ cxr = ICEIL(xr);
/* reverse the edges if necessary */
- if (xl < xr)
- {
+ if (xl < xr) {
*(width++) = cxr - cxl;
(ptsOut++)->x = cxl + xTrans;
}
- else
- {
+ else {
*(width++) = cxl - cxr;
(ptsOut++)->x = cxr + xTrans;
}
y++;
/* increment down the edges */
- xl += ml;
- xr += mr;
- j--;
+ xl += ml;
+ xr += mr;
+ j--;
}
- } while (y <= ymax);
+ } while (y <= ymax);
/* Finally, fill the spans we've collected */
- (*pgc->ops->FillSpans)(dst, pgc,
- ptsOut-FirstPoint, FirstPoint, FirstWidth, 1);
+ (*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)
+ int
+GetFPolyYBounds(SppPointPtr pts, int n, double yFtrans, int *by, int *ty)
{
- SppPointPtr ptMin;
- double ymin, ymax;
- SppPointPtr ptsStart = pts;
+ SppPointPtr ptMin;
+ double ymin, ymax;
+ SppPointPtr ptsStart = pts;
ptMin = pts;
ymin = ymax = (pts++)->y;
while (--n > 0) {
- if (pts->y < ymin)
- {
+ if (pts->y < ymin) {
ptMin = pts;
ymin = pts->y;
}
- if(pts->y > ymax)
+ if (pts->y > ymax)
ymax = pts->y;
pts++;
@@ -276,5 +245,5 @@ GetFPolyYBounds(
*by = ICEIL(ymin + yFtrans);
*ty = ICEIL(ymax + yFtrans - 1);
- return ptMin-ptsStart;
+ return ptMin - ptsStart;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-05 16:25:28 +0000