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tracks.c: draw_clue: Introduce bg parameter

No functional change.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

--- a/tracks.c

+++ b/tracks.c

@@ -2417,7 +2417,7 @@

     draw_update(dr, ox, oy, TILE_SIZE, TILE_SIZE);

 }

-static void draw_clue(drawing *dr, game_drawstate *ds, int w, int clue, int i, int col)

+static void draw_clue(drawing *dr, game_drawstate *ds, int w, int clue, int i, int col, int bg)

 {

     int cx, cy, tsz = TILE_SIZE/2;

     char buf[20];

@@ -2432,7 +2432,7 @@

     draw_rect(dr, cx - tsz + GRID_LINE_TL, cy - tsz + GRID_LINE_TL,

               TILE_SIZE - GRID_LINE_ALL, TILE_SIZE - GRID_LINE_ALL,

-              COL_BACKGROUND);

+              bg);

     sprintf(buf, "%d", clue);

     draw_text(dr, cx, cy, FONT_VARIABLE, tsz, ALIGN_VCENTRE|ALIGN_HCENTRE,

               col, buf);

@@ -2518,7 +2518,8 @@

         if (force || (state->num_errors[i] != ds->num_errors[i])) {

             ds->num_errors[i] = state->num_errors[i];

             draw_clue(dr, ds, w, state->numbers->numbers[i], i,

-                      ds->num_errors[i] ? COL_ERROR : COL_CLUE);

+                      ds->num_errors[i] ? COL_ERROR : COL_CLUE,

+		      COL_BACKGROUND);

         }

     }

@@ -2608,7 +2609,8 @@

     /* clue numbers, and loop ends */

     for (i = 0; i < w+h; i++)

-        draw_clue(dr, ds, w, state->numbers->numbers[i], i, black);

+        draw_clue(dr, ds, w, state->numbers->numbers[i], i,

+		  black, COL_BACKGROUND);

     draw_loop_ends(dr, ds, state, black);

     /* clue tracks / solution */