Fix:core:Reduce stack usage for objects with many coordinates

git-svn-id: https://navit.svn.sourceforge.net/svnroot/navit/trunk@2996 ffa7fe5e-494d-0410-b361-a75ebd5db220

diff --git a/navit/navit/graphics.c b/navit/navit/graphics.c
index b279225..a04c2fc 100644 (file)
--- a/navit/navit/graphics.c
+++ b/navit/navit/graphics.c
@@ -1458,9 +1458,10 @@ static void
 graphics_draw_polygon_clipped(struct graphics *gra, struct graphics_gc *gc, struct point *pin, int count_in)
 {
        struct point_rect r=gra->r;
-       struct point *pout,*p,*s,pi;
-       struct point p1[count_in*8+1];
-       struct point p2[count_in*8+1];
+       struct point *pout,*p,*s,pi,*p1,*p2;
+       int limit=10000;
+       struct point pa1[count_in < limit ? count_in*8+1:0];
+       struct point pa2[count_in < limit ? count_in*8+1:0];
        int count_out,edge=3;
        int i;
 #if 0
@@ -1469,7 +1470,14 @@ graphics_draw_polygon_clipped(struct graphics *gra, struct graphics_gc *gc, stru
        r.rl.x-=20;
        r.rl.y-=20;
 #endif
-
+       if (count_in < limit) {
+               p1=pa1;
+               p2=pa2;
+       } else {
+               p1=g_new(struct point, count_in*8+1);
+               p2=g_new(struct point, count_in*8+1);
+       }
+       
        pout=p1;
        for (edge = 0 ; edge < 4 ; edge++) {
                p=pin;
@@ -1501,6 +1509,10 @@ graphics_draw_polygon_clipped(struct graphics *gra, struct graphics_gc *gc, stru
                }
        }
        gra->meth.draw_polygon(gra->priv, gc->priv, pin, count_in);
+       if (count_in >= limit) {
+               g_free(p1);
+               g_free(p2);
+       }
 }