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The Untangle completion flash was weedy and anaemic; beef it up a
bit. In particular, it now flashes between _two_ specially picked
colours (white and mid-grey), meaning that it should be visible even
if your default background colour is white; and it also flashes
twice rather than once.

[originally from svn r6121]

--- a/untangle.c

+++ b/untangle.c

@@ -31,7 +31,7 @@

 #define DRAG_THRESHOLD (CIRCLE_RADIUS * 2)

 #define PREFERRED_TILESIZE 64

-#define FLASH_TIME 0.13F

+#define FLASH_TIME 0.30F

 #define ANIM_TIME 0.13F

 #define SOLVEANIM_TIME 0.50F

@@ -42,6 +42,8 @@

     COL_POINT,

     COL_DRAGPOINT,

     COL_NEIGHBOUR,

+    COL_FLASH1,

+    COL_FLASH2,

     NCOLOURS

 };

@@ -955,6 +957,14 @@

     ret[COL_NEIGHBOUR * 3 + 1] = 0.0F;

     ret[COL_NEIGHBOUR * 3 + 2] = 0.0F;

+    ret[COL_FLASH1 * 3 + 0] = 0.5F;

+    ret[COL_FLASH1 * 3 + 1] = 0.5F;

+    ret[COL_FLASH1 * 3 + 2] = 0.5F;

+

+    ret[COL_FLASH2 * 3 + 0] = 1.0F;

+    ret[COL_FLASH2 * 3 + 1] = 1.0F;

+    ret[COL_FLASH2 * 3 + 2] = 1.0F;

+

     *ncolours = NCOLOURS;

     return ret;

 }

@@ -999,7 +1009,13 @@

      * whole thing every time.

      */

-    bg = (flashtime != 0 ? COL_DRAGPOINT : COL_BACKGROUND);

+    if (flashtime == 0)

+        bg = COL_BACKGROUND;

+    else if ((int)(flashtime * 4 / FLASH_TIME) % 2 == 0)

+        bg = COL_FLASH1;

+    else

+        bg = COL_FLASH2;

+

     game_compute_size(&state->params, ds->tilesize, &w, &h);

     draw_rect(fe, 0, 0, w, h, bg);