From http://www.jwz.org/xscreensaver/xscreensaver-5.22.tar.gz

[xscreensaver] / utils / spline.c

diff --git a/utils/spline.c b/utils/spline.c
old mode 100755 (executable)
new mode 100644 (file)
index d242d63..1a73ea6
--- a/utils/spline.c
+++ b/utils/spline.c
@@ -24,18 +24,11 @@
    from C++ to C by Matthieu Devin <devin@lucid.com> some time in 1992.
  */
 
-#include <stdio.h>
+#include "utils.h"
 #include "spline.h"
-#if __STDC__
-#include <stdlib.h>
-#endif
-#include <math.h>
 
-/* Lifted from InterViews */
 #define SMOOTHNESS 1.0
 
-#if __STDC__
-static void no_more_memory (void);
 static void grow_spline_points (spline* s);
 static void mid_point (double x0, double y0, double x1, double y1,
                       double *mx, double *my);
@@ -51,22 +44,11 @@ static void calc_section (spline* s, double cminus1x, double cminus1y,
                          double cx, double cy, double cplus1x, double cplus1y,
                          double cplus2x, double cplus2y);
 
-#endif
-
-static void
-no_more_memory ()
-{
-  fprintf (stderr, "No more memory\n");
-  exit (1);
-}
-
 spline*
-make_spline (size)
-     u_int size;
+make_spline (unsigned int size)
 {
   spline* s = (spline*)calloc (1, sizeof (spline));
-  if (!s)
-    no_more_memory ();
+  if (!s) abort();
   s->n_controls = size;
   s->control_x = (double*)calloc (s->n_controls, sizeof (double));
   s->control_y = (double*)calloc (s->n_controls, sizeof (double));
@@ -76,42 +58,42 @@ make_spline (size)
   s->points = (XPoint*)calloc (s->allocated_points, sizeof (XPoint));
 
   if (!s->control_x || !s->control_y || !s->points)
-    no_more_memory ();
+    abort();
 
   return s;
 }
 
 static void
-grow_spline_points (s)
-     spline* s;
+grow_spline_points (spline *s)
 {
-  s->allocated_points *= 2;
+  s->allocated_points = 10 + (s->allocated_points * 1.3);
   s->points =
     (XPoint*)realloc (s->points, s->allocated_points * sizeof (XPoint));
-
-  if (!s->points)
-    no_more_memory ();
+  if (!s->points) abort();
 }
 
 static void 
-mid_point (x0, y0, x1, y1, mx, my)
-     double x0, y0, x1, y1, *mx, *my;
+mid_point (double x0, double y0,
+          double x1, double y1,
+          double *mx, double *my)
 {
   *mx = (x0 + x1) / 2.0;
   *my = (y0 + y1) / 2.0;
 }
 
 static void 
-third_point (x0, y0, x1, y1, tx, ty)
-     double x0, y0, x1, y1, *tx, *ty;
+third_point (double x0, double y0,
+            double x1, double y1,
+            double *tx, double *ty)
 {
   *tx = (2 * x0 + x1) / 3.0;
   *ty = (2 * y0 + y1) / 3.0;
 }
 
 static int
-can_approx_with_line (x0, y0, x2, y2, x3, y3)
-     double x0, y0, x2, y2, x3, y3;
+can_approx_with_line (double x0, double y0,
+                     double x2, double y2,
+                     double x3, double y3)
 {
   double triangle_area, side_squared, dx, dy;
   
@@ -125,9 +107,9 @@ can_approx_with_line (x0, y0, x2, y2, x3, y3)
 }
 
 static void
-add_line (s, x0, y0, x1, y1)
-     spline* s;
-     double x0, y0, x1, y1;
+add_line (spline *s,
+         double x0, double y0,
+         double x1, double y1)
 {
   if (s->n_points >= s->allocated_points)
     grow_spline_points (s);
@@ -144,9 +126,11 @@ add_line (s, x0, y0, x1, y1)
 }
 
 static void 
-add_bezier_arc (s, x0, y0, x1, y1, x2, y2, x3, y3)
-     spline* s;
-     double x0, y0, x1, y1, x2, y2, x3, y3;
+add_bezier_arc (spline *s,
+               double x0, double y0,
+               double x1, double y1,
+               double x2, double y2,
+               double x3, double y3)
 {
   double midx01, midx12, midx23, midlsegx, midrsegx, cx,
   midy01, midy12, midy23, midlsegy, midrsegy, cy;
@@ -172,10 +156,11 @@ add_bezier_arc (s, x0, y0, x1, y1, x2, y2, x3, y3)
 }
 
 static void
-calc_section (s, cminus1x, cminus1y, cx, cy, cplus1x, cplus1y,
-             cplus2x, cplus2y)
-     spline* s;
-     double cminus1x, cminus1y, cx, cy, cplus1x, cplus1y, cplus2x, cplus2y;
+calc_section (spline *s,
+             double cminus1x, double cminus1y,
+             double cx, double cy,
+             double cplus1x, double cplus1y,
+             double cplus2x, double cplus2y)
 {
   double p0x, p1x, p2x, p3x, tempx,
   p0y, p1y, p2y, p3y, tempy;
@@ -190,8 +175,7 @@ calc_section (s, cminus1x, cminus1y, cx, cy, cplus1x, cplus1y,
 }
 
 void
-compute_spline (s)
-     spline* s;
+compute_spline (spline *s)
 {
   int i;
   s->n_points = 0;
@@ -223,8 +207,7 @@ compute_spline (s)
 }
 
 void 
-compute_closed_spline (s)
-     spline *s;
+compute_closed_spline (spline *s)
 {
   int i;
   s->n_points = 0;
@@ -256,8 +239,7 @@ compute_closed_spline (s)
 }
 
 void
-just_fill_spline (s)
-     spline *s;
+just_fill_spline (spline *s)
 {
   int i;
 
@@ -275,8 +257,7 @@ just_fill_spline (s)
 }
 
 void
-append_spline_points (s1, s2)
-     spline *s1, *s2;
+append_spline_points (spline *s1, spline *s2)
 {
   int i;
   while (s1->allocated_points < s1->n_points + s2->n_points)
@@ -290,9 +271,7 @@ append_spline_points (s1, s2)
 }
 
 void
-spline_bounding_box (s, rectangle_out)
-     spline* s;
-     XRectangle* rectangle_out;
+spline_bounding_box (spline *s, XRectangle *rectangle_out)
 {
   int min_x;
   int max_x;
@@ -329,3 +308,12 @@ spline_bounding_box (s, rectangle_out)
   rectangle_out->width = max_x - min_x;
   rectangle_out->height = max_y - min_y;
 }
+
+void
+free_spline(spline * s)
+{
+  free ((void *) s->control_x);
+  free ((void *) s->control_y);
+  free ((void *) s->points);
+  free ((void *) s);
+}