chiark / gitweb /
Substantial infrastructure upheaval. I've separated the drawing API
[sgt-puzzles.git] / mines.c
diff --git a/mines.c b/mines.c
index 6895b2e997e318fee6704a0e01a4409712170ce5..746106b64464e7c2c0b289a7f27666df4566bc39 100644 (file)
--- a/mines.c
+++ b/mines.c
@@ -53,7 +53,7 @@ struct mine_layout {
      */
     int n, unique;
     random_state *rs;
-    midend_data *me;                  /* to give back the new game desc */
+    midend *me;                       /* to give back the new game desc */
 };
 
 struct game_state {
@@ -237,7 +237,7 @@ static game_params *custom_params(config_item *cfg)
     return ret;
 }
 
-static char *validate_params(game_params *params)
+static char *validate_params(game_params *params, int full)
 {
     /*
      * Lower limit on grid size: each dimension must be at least 3.
@@ -253,7 +253,7 @@ static char *validate_params(game_params *params)
      * _have_ to have a gap somewhere which you can't determine the
      * position of.
      */
-    if (params->w <= 2 || params->h <= 2)
+    if (full && params->unique && (params->w <= 2 || params->h <= 2))
        return "Width and height must both be greater than two";
     if (params->n > params->w * params->h - 9)
        return "Too many mines for grid size";
@@ -1855,7 +1855,7 @@ static char *describe_layout(char *grid, int area, int x, int y,
      */
     ret = snewn((area+3)/4 + 100, char);
     p = ret + sprintf(ret, "%d,%d,%s", x, y,
-                      obfuscate ? "m" : "");   /* 'm' == masked */
+                      obfuscate ? "m" : "u");   /* 'm' == masked */
     for (i = 0; i < (area+3)/4; i++) {
         int v = bmp[i/2];
         if (i % 2 == 0)
@@ -1946,7 +1946,7 @@ static char *new_mine_layout(int w, int h, int n, int x, int y, int unique,
 }
 
 static char *new_game_desc(game_params *params, random_state *rs,
-                          game_aux_info **aux, int interactive)
+                          char **aux, int interactive)
 {
     /*
      * We generate the coordinates of an initial click even if they
@@ -1984,17 +1984,13 @@ static char *new_game_desc(game_params *params, random_state *rs,
     }
 }
 
-static void game_free_aux_info(game_aux_info *aux)
-{
-    assert(!"Shouldn't happen");
-}
-
 static char *validate_desc(game_params *params, char *desc)
 {
     int wh = params->w * params->h;
     int x, y;
 
     if (*desc == 'r') {
+        desc++;
        if (!*desc || !isdigit((unsigned char)*desc))
            return "No initial mine count in game description";
        while (*desc && isdigit((unsigned char)*desc))
@@ -2009,28 +2005,28 @@ static char *validate_desc(game_params *params, char *desc)
            return "No ',' after uniqueness specifier in game description";
        /* now ignore the rest */
     } else {
-       if (!*desc || !isdigit((unsigned char)*desc))
-           return "No initial x-coordinate in game description";
-       x = atoi(desc);
-       if (x < 0 || x >= params->w)
-           return "Initial x-coordinate was out of range";
-       while (*desc && isdigit((unsigned char)*desc))
-           desc++;                    /* skip over x coordinate */
-       if (*desc != ',')
-           return "No ',' after initial x-coordinate in game description";
-       desc++;                        /* eat comma */
-       if (!*desc || !isdigit((unsigned char)*desc))
-           return "No initial y-coordinate in game description";
-       y = atoi(desc);
-       if (y < 0 || y >= params->h)
-           return "Initial y-coordinate was out of range";
-       while (*desc && isdigit((unsigned char)*desc))
-           desc++;                    /* skip over y coordinate */
-       if (*desc != ',')
-           return "No ',' after initial y-coordinate in game description";
-       desc++;                        /* eat comma */
-       /* eat `m', meaning `masked', if present */
-       if (*desc == 'm')
+       if (*desc && isdigit((unsigned char)*desc)) {
+           x = atoi(desc);
+           if (x < 0 || x >= params->w)
+               return "Initial x-coordinate was out of range";
+           while (*desc && isdigit((unsigned char)*desc))
+               desc++;                /* skip over x coordinate */
+           if (*desc != ',')
+               return "No ',' after initial x-coordinate in game description";
+           desc++;                    /* eat comma */
+           if (!*desc || !isdigit((unsigned char)*desc))
+               return "No initial y-coordinate in game description";
+           y = atoi(desc);
+           if (y < 0 || y >= params->h)
+               return "Initial y-coordinate was out of range";
+           while (*desc && isdigit((unsigned char)*desc))
+               desc++;                /* skip over y coordinate */
+           if (*desc != ',')
+               return "No ',' after initial y-coordinate in game description";
+           desc++;                    /* eat comma */
+       }
+       /* eat `m' for `masked' or `u' for `unmasked', if present */
+       if (*desc == 'm' || *desc == 'u')
            desc++;
        /* now just check length of remainder */
        if (strlen(desc) != (wh+3)/4)
@@ -2051,12 +2047,23 @@ static int open_square(game_state *state, int x, int y)
         * hasn't been generated yet. Generate it based on the
         * initial click location.
         */
-       char *desc;
+       char *desc, *privdesc;
        state->layout->mines = new_mine_layout(w, h, state->layout->n,
                                               x, y, state->layout->unique,
                                               state->layout->rs,
                                               &desc);
-       midend_supersede_game_desc(state->layout->me, desc);
+       /*
+        * Find the trailing substring of the game description
+        * corresponding to just the mine layout; we will use this
+        * as our second `private' game ID for serialisation.
+        */
+       privdesc = desc;
+       while (*privdesc && isdigit((unsigned char)*privdesc)) privdesc++;
+       if (*privdesc == ',') privdesc++;
+       while (*privdesc && isdigit((unsigned char)*privdesc)) privdesc++;
+       if (*privdesc == ',') privdesc++;
+       assert(*privdesc == 'm');
+       midend_supersede_game_desc(state->layout->me, desc, privdesc);
        sfree(desc);
        random_free(state->layout->rs);
        state->layout->rs = NULL;
@@ -2150,7 +2157,7 @@ static int open_square(game_state *state, int x, int y)
     return 0;
 }
 
-static game_state *new_game(midend_data *me, game_params *params, char *desc)
+static game_state *new_game(midend *me, game_params *params, char *desc)
 {
     game_state *state = snew(game_state);
     int i, wh, x, y, ret, masked;
@@ -2191,21 +2198,27 @@ static game_state *new_game(midend_data *me, game_params *params, char *desc)
     } else {
        state->layout->rs = NULL;
        state->layout->me = NULL;
-
        state->layout->mines = snewn(wh, char);
-       x = atoi(desc);
-       while (*desc && isdigit((unsigned char)*desc))
-           desc++;                    /* skip over x coordinate */
-       if (*desc) desc++;             /* eat comma */
-       y = atoi(desc);
-       while (*desc && isdigit((unsigned char)*desc))
-           desc++;                    /* skip over y coordinate */
-       if (*desc) desc++;             /* eat comma */
+
+       if (*desc && isdigit((unsigned char)*desc)) {
+           x = atoi(desc);
+           while (*desc && isdigit((unsigned char)*desc))
+               desc++;                /* skip over x coordinate */
+           if (*desc) desc++;         /* eat comma */
+           y = atoi(desc);
+           while (*desc && isdigit((unsigned char)*desc))
+               desc++;                /* skip over y coordinate */
+           if (*desc) desc++;         /* eat comma */
+       } else {
+           x = y = -1;
+       }
 
        if (*desc == 'm') {
            masked = TRUE;
            desc++;
        } else {
+           if (*desc == 'u')
+               desc++;
            /*
             * We permit game IDs to be entered by hand without the
             * masking transformation.
@@ -2241,7 +2254,8 @@ static game_state *new_game(midend_data *me, game_params *params, char *desc)
                state->layout->mines[i] = 1;
        }
 
-       ret = open_square(state, x, y);
+       if (x >= 0 && y >= 0)
+           ret = open_square(state, x, y);
         sfree(bmp);
     }
 
@@ -2279,46 +2293,15 @@ static void free_game(game_state *state)
     sfree(state);
 }
 
-static game_state *solve_game(game_state *state, game_state *currstate,
-                             game_aux_info *aux, char **error)
+static char *solve_game(game_state *state, game_state *currstate,
+                       char *aux, char **error)
 {
-    /*
-     * Simply expose the entire grid as if it were a completed
-     * solution.
-     */
-    game_state *ret;
-    int yy, xx;
-
     if (!state->layout->mines) {
-        *error = "Game has not been started yet";
-        return NULL;
+       *error = "Game has not been started yet";
+       return NULL;
     }
 
-    ret = dup_game(state);
-    for (yy = 0; yy < ret->h; yy++)
-        for (xx = 0; xx < ret->w; xx++) {
-
-            if (ret->layout->mines[yy*ret->w+xx]) {
-                ret->grid[yy*ret->w+xx] = -1;
-            } else {
-                int dx, dy, v;
-
-                v = 0;
-
-                for (dx = -1; dx <= +1; dx++)
-                    for (dy = -1; dy <= +1; dy++)
-                        if (xx+dx >= 0 && xx+dx < ret->w &&
-                            yy+dy >= 0 && yy+dy < ret->h &&
-                            ret->layout->mines[(yy+dy)*ret->w+(xx+dx)])
-                            v++;
-
-                ret->grid[yy*ret->w+xx] = v;
-            }
-        }
-    ret->used_solve = ret->just_used_solve = TRUE;
-    ret->won = TRUE;
-
-    return ret;
+    return dupstr("S");
 }
 
 static char *game_text_format(game_state *state)
@@ -2351,16 +2334,18 @@ static char *game_text_format(game_state *state)
 
 struct game_ui {
     int hx, hy, hradius;              /* for mouse-down highlights */
+    int validradius;
     int flash_is_death;
-    int deaths;
+    int deaths, completed;
 };
 
 static game_ui *new_ui(game_state *state)
 {
     game_ui *ui = snew(game_ui);
     ui->hx = ui->hy = -1;
-    ui->hradius = 0;
+    ui->hradius = ui->validradius = 0;
     ui->deaths = 0;
+    ui->completed = FALSE;
     ui->flash_is_death = FALSE;               /* *shrug* */
     return ui;
 }
@@ -2370,13 +2355,36 @@ static void free_ui(game_ui *ui)
     sfree(ui);
 }
 
+static char *encode_ui(game_ui *ui)
+{
+    char buf[80];
+    /*
+     * The deaths counter and completion status need preserving
+     * across a serialisation.
+     */
+    sprintf(buf, "D%d", ui->deaths);
+    if (ui->completed)
+       strcat(buf, "C");
+    return dupstr(buf);
+}
+
+static void decode_ui(game_ui *ui, char *encoding)
+{
+    int p= 0;
+    sscanf(encoding, "D%d%n", &ui->deaths, &p);
+    if (encoding[p] == 'C')
+       ui->completed = TRUE;
+}
+
 static void game_changed_state(game_ui *ui, game_state *oldstate,
                                game_state *newstate)
 {
+    if (newstate->won)
+       ui->completed = TRUE;
 }
 
 struct game_drawstate {
-    int w, h, started, tilesize;
+    int w, h, started, tilesize, bg;
     signed char *grid;
     /*
      * Items in this `grid' array have all the same values as in
@@ -2390,11 +2398,11 @@ struct game_drawstate {
      */
 };
 
-static game_state *make_move(game_state *from, game_ui *ui, game_drawstate *ds,
-                             int x, int y, int button)
+static char *interpret_move(game_state *from, game_ui *ui, game_drawstate *ds,
+                           int x, int y, int button)
 {
-    game_state *ret;
     int cx, cy;
+    char buf[256];
 
     if (from->dead || from->won)
        return NULL;                   /* no further moves permitted */
@@ -2418,7 +2426,11 @@ static game_state *make_move(game_state *from, game_ui *ui, game_drawstate *ds,
        ui->hx = cx;
        ui->hy = cy;
        ui->hradius = (from->grid[cy*from->w+cx] >= 0 ? 1 : 0);
-       return from;
+       if (button == LEFT_BUTTON)
+           ui->validradius = ui->hradius;
+       else if (button == MIDDLE_BUTTON)
+           ui->validradius = 1;
+       return "";
     }
 
     if (button == RIGHT_BUTTON) {
@@ -2436,11 +2448,8 @@ static game_state *make_move(game_state *from, game_ui *ui, game_drawstate *ds,
            from->grid[cy * from->w + cx] != -1)
            return NULL;
 
-       ret = dup_game(from);
-        ret->just_used_solve = FALSE;
-       ret->grid[cy * from->w + cx] ^= (-2 ^ -1);
-
-       return ret;
+       sprintf(buf, "F%d,%d", cx, cy);
+       return dupstr(buf);
     }
 
     if (button == LEFT_RELEASE || button == MIDDLE_RELEASE) {
@@ -2449,10 +2458,10 @@ static game_state *make_move(game_state *from, game_ui *ui, game_drawstate *ds,
 
        /*
         * At this stage we must never return NULL: we have adjusted
-        * the ui, so at worst we return `from'.
+        * the ui, so at worst we return "".
         */
        if (cx < 0 || cx >= from->w || cy < 0 || cy >= from->h)
-           return from;
+           return "";
 
        /*
         * Left-clicking on a covered square opens a tile. Not
@@ -2461,13 +2470,14 @@ static game_state *make_move(game_state *from, game_ui *ui, game_drawstate *ds,
         */
        if (button == LEFT_RELEASE &&
            (from->grid[cy * from->w + cx] == -2 ||
-            from->grid[cy * from->w + cx] == -3)) {
-           ret = dup_game(from);
-            ret->just_used_solve = FALSE;
-           open_square(ret, cx, cy);
-            if (ret->dead)
-                ui->deaths++;
-           return ret;
+            from->grid[cy * from->w + cx] == -3) &&
+           ui->validradius == 0) {
+           /* Check if you've killed yourself. */
+           if (from->layout->mines && from->layout->mines[cy * from->w + cx])
+               ui->deaths++;
+
+           sprintf(buf, "O%d,%d", cx, cy);
+           return dupstr(buf);
        }
 
        /*
@@ -2476,7 +2486,7 @@ static game_state *make_move(game_state *from, game_ui *ui, game_drawstate *ds,
         * surrounding the tile is equal to its mine count, and if
         * so then we open all other surrounding squares.
         */
-       if (from->grid[cy * from->w + cx] > 0) {
+       if (from->grid[cy * from->w + cx] > 0 && ui->validradius == 1) {
            int dy, dx, n;
 
            /* Count mine markers. */
@@ -2490,8 +2500,101 @@ static game_state *make_move(game_state *from, game_ui *ui, game_drawstate *ds,
                    }
 
            if (n == from->grid[cy * from->w + cx]) {
-               ret = dup_game(from);
-                ret->just_used_solve = FALSE;
+
+               /*
+                * Now see if any of the squares we're clearing
+                * contains a mine (which will happen iff you've
+                * incorrectly marked the mines around the clicked
+                * square). If so, we open _just_ those squares, to
+                * reveal as little additional information as we
+                * can.
+                */
+               char *p = buf;
+               char *sep = "";
+
+               for (dy = -1; dy <= +1; dy++)
+                   for (dx = -1; dx <= +1; dx++)
+                       if (cx+dx >= 0 && cx+dx < from->w &&
+                           cy+dy >= 0 && cy+dy < from->h) {
+                           if (from->grid[(cy+dy)*from->w+(cx+dx)] != -1 &&
+                               from->layout->mines &&
+                               from->layout->mines[(cy+dy)*from->w+(cx+dx)]) {
+                               p += sprintf(p, "%sO%d,%d", sep, cx+dx, cy+dy);
+                               sep = ";";
+                           }
+                       }
+
+               if (p > buf) {
+                   ui->deaths++;
+               } else {
+                   sprintf(buf, "C%d,%d", cx, cy);
+               }
+
+               return dupstr(buf);
+           }
+       }
+
+       return "";
+    }
+
+    return NULL;
+}
+
+static game_state *execute_move(game_state *from, char *move)
+{
+    int cy, cx;
+    game_state *ret;
+
+    if (!strcmp(move, "S")) {
+       /*
+        * Simply expose the entire grid as if it were a completed
+        * solution.
+        */
+       int yy, xx;
+
+       ret = dup_game(from);
+       for (yy = 0; yy < ret->h; yy++)
+           for (xx = 0; xx < ret->w; xx++) {
+
+               if (ret->layout->mines[yy*ret->w+xx]) {
+                   ret->grid[yy*ret->w+xx] = -1;
+               } else {
+                   int dx, dy, v;
+
+                   v = 0;
+
+                   for (dx = -1; dx <= +1; dx++)
+                       for (dy = -1; dy <= +1; dy++)
+                           if (xx+dx >= 0 && xx+dx < ret->w &&
+                               yy+dy >= 0 && yy+dy < ret->h &&
+                               ret->layout->mines[(yy+dy)*ret->w+(xx+dx)])
+                               v++;
+
+                   ret->grid[yy*ret->w+xx] = v;
+               }
+           }
+       ret->used_solve = ret->just_used_solve = TRUE;
+       ret->won = TRUE;
+
+       return ret;
+    } else {
+       ret = dup_game(from);
+       ret->just_used_solve = FALSE;
+
+       while (*move) {
+           if (move[0] == 'F' &&
+               sscanf(move+1, "%d,%d", &cx, &cy) == 2 &&
+               cx >= 0 && cx < from->w && cy >= 0 && cy < from->h) {
+               ret->grid[cy * from->w + cx] ^= (-2 ^ -1);
+           } else if (move[0] == 'O' &&
+                      sscanf(move+1, "%d,%d", &cx, &cy) == 2 &&
+                      cx >= 0 && cx < from->w && cy >= 0 && cy < from->h) {
+               open_square(ret, cx, cy);
+           } else if (move[0] == 'C' &&
+                      sscanf(move+1, "%d,%d", &cx, &cy) == 2 &&
+                      cx >= 0 && cx < from->w && cy >= 0 && cy < from->h) {
+               int dx, dy;
+
                for (dy = -1; dy <= +1; dy++)
                    for (dx = -1; dx <= +1; dx++)
                        if (cx+dx >= 0 && cx+dx < ret->w &&
@@ -2499,43 +2602,40 @@ static game_state *make_move(game_state *from, game_ui *ui, game_drawstate *ds,
                            (ret->grid[(cy+dy)*ret->w+(cx+dx)] == -2 ||
                             ret->grid[(cy+dy)*ret->w+(cx+dx)] == -3))
                            open_square(ret, cx+dx, cy+dy);
-                if (ret->dead)
-                    ui->deaths++;
-               return ret;
+           } else {
+               free_game(ret);
+               return NULL;
            }
+
+           while (*move && *move != ';') move++;
+           if (*move) move++;
        }
 
-       return from;
+       return ret;
     }
-
-    return NULL;
 }
 
 /* ----------------------------------------------------------------------
  * Drawing routines.
  */
 
-static void game_size(game_params *params, game_drawstate *ds,
-                      int *x, int *y, int expand)
+static void game_compute_size(game_params *params, int tilesize,
+                             int *x, int *y)
 {
-    int tsx, tsy, ts;
-    /*
-     * Each window dimension equals the tile size times 3 more than
-     * the grid dimension (the border is 3/2 the width of the
-     * tiles).
-     */
-    tsx = *x / (params->w + 3);
-    tsy = *y / (params->h + 3);
-    ts = min(tsx, tsy);
-    if (expand)
-        ds->tilesize = ts;
-    else
-        ds->tilesize = min(ts, PREFERRED_TILE_SIZE);
+    /* Ick: fake up `ds->tilesize' for macro expansion purposes */
+    struct { int tilesize; } ads, *ds = &ads;
+    ads.tilesize = tilesize;
 
     *x = BORDER * 2 + TILE_SIZE * params->w;
     *y = BORDER * 2 + TILE_SIZE * params->h;
 }
 
+static void game_set_size(drawing *dr, game_drawstate *ds,
+                         game_params *params, int tilesize)
+{
+    ds->tilesize = tilesize;
+}
+
 static float *game_colours(frontend *fe, game_state *state, int *ncolours)
 {
     float *ret = snewn(3 * NCOLOURS, float);
@@ -2614,7 +2714,7 @@ static float *game_colours(frontend *fe, game_state *state, int *ncolours)
     return ret;
 }
 
-static game_drawstate *game_new_drawstate(game_state *state)
+static game_drawstate *game_new_drawstate(drawing *dr, game_state *state)
 {
     struct game_drawstate *ds = snew(struct game_drawstate);
 
@@ -2623,19 +2723,20 @@ static game_drawstate *game_new_drawstate(game_state *state)
     ds->started = FALSE;
     ds->tilesize = 0;                  /* not decided yet */
     ds->grid = snewn(ds->w * ds->h, signed char);
+    ds->bg = -1;
 
     memset(ds->grid, -99, ds->w * ds->h);
 
     return ds;
 }
 
-static void game_free_drawstate(game_drawstate *ds)
+static void game_free_drawstate(drawing *dr, game_drawstate *ds)
 {
     sfree(ds->grid);
     sfree(ds);
 }
 
-static void draw_tile(frontend *fe, game_drawstate *ds,
+static void draw_tile(drawing *dr, game_drawstate *ds,
                       int x, int y, int v, int bg)
 {
     if (v < 0) {
@@ -2648,10 +2749,10 @@ static void draw_tile(frontend *fe, game_drawstate *ds,
            /*
             * Omit the highlights in this case.
             */
-           draw_rect(fe, x, y, TILE_SIZE, TILE_SIZE,
+           draw_rect(dr, x, y, TILE_SIZE, TILE_SIZE,
                       bg == COL_BACKGROUND ? COL_BACKGROUND2 : bg);
-           draw_line(fe, x, y, x + TILE_SIZE - 1, y, COL_LOWLIGHT);
-           draw_line(fe, x, y, x, y + TILE_SIZE - 1, COL_LOWLIGHT);
+           draw_line(dr, x, y, x + TILE_SIZE - 1, y, COL_LOWLIGHT);
+           draw_line(dr, x, y, x, y + TILE_SIZE - 1, COL_LOWLIGHT);
        } else {
            /*
             * Draw highlights to indicate the square is covered.
@@ -2662,15 +2763,14 @@ static void draw_tile(frontend *fe, game_drawstate *ds,
            coords[3] = y;
            coords[4] = x;
            coords[5] = y + TILE_SIZE - 1;
-           draw_polygon(fe, coords, 3, TRUE, COL_LOWLIGHT ^ hl);
-           draw_polygon(fe, coords, 3, FALSE, COL_LOWLIGHT ^ hl);
+           draw_polygon(dr, coords, 3, COL_LOWLIGHT ^ hl, COL_LOWLIGHT ^ hl);
 
            coords[0] = x;
            coords[1] = y;
-           draw_polygon(fe, coords, 3, TRUE, COL_HIGHLIGHT ^ hl);
-           draw_polygon(fe, coords, 3, FALSE, COL_HIGHLIGHT ^ hl);
+           draw_polygon(dr, coords, 3, COL_HIGHLIGHT ^ hl,
+                        COL_HIGHLIGHT ^ hl);
 
-           draw_rect(fe, x + HIGHLIGHT_WIDTH, y + HIGHLIGHT_WIDTH,
+           draw_rect(dr, x + HIGHLIGHT_WIDTH, y + HIGHLIGHT_WIDTH,
                      TILE_SIZE - 2*HIGHLIGHT_WIDTH, TILE_SIZE - 2*HIGHLIGHT_WIDTH,
                      bg);
        }
@@ -2689,21 +2789,19 @@ static void draw_tile(frontend *fe, game_drawstate *ds,
            SETCOORD(3, 0.25, 0.8);
            SETCOORD(4, 0.55, 0.7);
            SETCOORD(5, 0.55, 0.35);
-           draw_polygon(fe, coords, 6, TRUE, COL_FLAGBASE);
-           draw_polygon(fe, coords, 6, FALSE, COL_FLAGBASE);
+           draw_polygon(dr, coords, 6, COL_FLAGBASE, COL_FLAGBASE);
 
            SETCOORD(0, 0.6, 0.2);
            SETCOORD(1, 0.6, 0.5);
            SETCOORD(2, 0.2, 0.35);
-           draw_polygon(fe, coords, 3, TRUE, COL_FLAG);
-           draw_polygon(fe, coords, 3, FALSE, COL_FLAG);
+           draw_polygon(dr, coords, 3, COL_FLAG, COL_FLAG);
 #undef SETCOORD
 
        } else if (v == -3) {
            /*
             * Draw a question mark.
             */
-           draw_text(fe, x + TILE_SIZE / 2, y + TILE_SIZE / 2,
+           draw_text(dr, x + TILE_SIZE / 2, y + TILE_SIZE / 2,
                      FONT_VARIABLE, TILE_SIZE * 6 / 8,
                      ALIGN_VCENTRE | ALIGN_HCENTRE,
                      COL_QUERY, "?");
@@ -2716,11 +2814,11 @@ static void draw_tile(frontend *fe, game_drawstate *ds,
         * Exception is that for value 65 (mine we've just trodden
         * on), we clear the square to COL_BANG.
         */
-        draw_rect(fe, x, y, TILE_SIZE, TILE_SIZE,
+        draw_rect(dr, x, y, TILE_SIZE, TILE_SIZE,
                  (v == 65 ? COL_BANG :
                    bg == COL_BACKGROUND ? COL_BACKGROUND2 : bg));
-       draw_line(fe, x, y, x + TILE_SIZE - 1, y, COL_LOWLIGHT);
-       draw_line(fe, x, y, x, y + TILE_SIZE - 1, COL_LOWLIGHT);
+       draw_line(dr, x, y, x + TILE_SIZE - 1, y, COL_LOWLIGHT);
+       draw_line(dr, x, y, x, y + TILE_SIZE - 1, COL_LOWLIGHT);
 
        if (v > 0 && v <= 8) {
            /*
@@ -2729,7 +2827,7 @@ static void draw_tile(frontend *fe, game_drawstate *ds,
            char str[2];
            str[0] = v + '0';
            str[1] = '\0';
-           draw_text(fe, x + TILE_SIZE / 2, y + TILE_SIZE / 2,
+           draw_text(dr, x + TILE_SIZE / 2, y + TILE_SIZE / 2,
                      FONT_VARIABLE, TILE_SIZE * 7 / 8,
                      ALIGN_VCENTRE | ALIGN_HCENTRE,
                      (COL_1 - 1) + v, str);
@@ -2741,7 +2839,7 @@ static void draw_tile(frontend *fe, game_drawstate *ds,
             * FIXME: this could be done better!
             */
 #if 0
-           draw_text(fe, x + TILE_SIZE / 2, y + TILE_SIZE / 2,
+           draw_text(dr, x + TILE_SIZE / 2, y + TILE_SIZE / 2,
                      FONT_VARIABLE, TILE_SIZE * 7 / 8,
                      ALIGN_VCENTRE | ALIGN_HCENTRE,
                      COL_MINE, "*");
@@ -2774,10 +2872,9 @@ static void draw_tile(frontend *fe, game_drawstate *ds,
                    xdy = -tdy;
                }
 
-               draw_polygon(fe, coords, 5*4, TRUE, COL_MINE);
-               draw_polygon(fe, coords, 5*4, FALSE, COL_MINE);
+               draw_polygon(dr, coords, 5*4, COL_MINE, COL_MINE);
 
-               draw_rect(fe, cx-r/3, cy-r/3, r/3, r/4, COL_HIGHLIGHT);
+               draw_rect(dr, cx-r/3, cy-r/3, r/3, r/4, COL_HIGHLIGHT);
            }
 #endif
 
@@ -2787,10 +2884,10 @@ static void draw_tile(frontend *fe, game_drawstate *ds,
                 */
                int dx;
                for (dx = -1; dx <= +1; dx++) {
-                   draw_line(fe, x + 3 + dx, y + 2,
+                   draw_line(dr, x + 3 + dx, y + 2,
                              x + TILE_SIZE - 3 + dx,
                              y + TILE_SIZE - 2, COL_CROSS);
-                   draw_line(fe, x + TILE_SIZE - 3 + dx, y + 2,
+                   draw_line(dr, x + TILE_SIZE - 3 + dx, y + 2,
                              x + 3 + dx, y + TILE_SIZE - 2,
                              COL_CROSS);
                }
@@ -2798,10 +2895,10 @@ static void draw_tile(frontend *fe, game_drawstate *ds,
        }
     }
 
-    draw_update(fe, x, y, TILE_SIZE, TILE_SIZE);
+    draw_update(dr, x, y, TILE_SIZE, TILE_SIZE);
 }
 
-static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate,
+static void game_redraw(drawing *dr, game_drawstate *ds, game_state *oldstate,
                        game_state *state, int dir, game_ui *ui,
                        float animtime, float flashtime)
 {
@@ -2820,10 +2917,10 @@ static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate,
     if (!ds->started) {
         int coords[10];
 
-       draw_rect(fe, 0, 0,
+       draw_rect(dr, 0, 0,
                  TILE_SIZE * state->w + 2 * BORDER,
                  TILE_SIZE * state->h + 2 * BORDER, COL_BACKGROUND);
-       draw_update(fe, 0, 0,
+       draw_update(dr, 0, 0,
                    TILE_SIZE * state->w + 2 * BORDER,
                    TILE_SIZE * state->h + 2 * BORDER);
 
@@ -2840,13 +2937,11 @@ static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate,
         coords[9] = COORD(state->h) + OUTER_HIGHLIGHT_WIDTH - 1;
         coords[6] = coords[8] + TILE_SIZE;
         coords[7] = coords[9] - TILE_SIZE;
-        draw_polygon(fe, coords, 5, TRUE, COL_HIGHLIGHT);
-        draw_polygon(fe, coords, 5, FALSE, COL_HIGHLIGHT);
+        draw_polygon(dr, coords, 5, COL_HIGHLIGHT, COL_HIGHLIGHT);
 
         coords[1] = COORD(0) - OUTER_HIGHLIGHT_WIDTH;
         coords[0] = COORD(0) - OUTER_HIGHLIGHT_WIDTH;
-        draw_polygon(fe, coords, 5, TRUE, COL_LOWLIGHT);
-        draw_polygon(fe, coords, 5, FALSE, COL_LOWLIGHT);
+        draw_polygon(dr, coords, 5, COL_LOWLIGHT, COL_LOWLIGHT);
 
         ds->started = TRUE;
     }
@@ -2869,11 +2964,12 @@ static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate,
                (abs(x-ui->hx) <= ui->hradius && abs(y-ui->hy) <= ui->hradius))
                v -= 20;
 
-           if (ds->grid[y*ds->w+x] != v || bg != COL_BACKGROUND) {
-               draw_tile(fe, ds, COORD(x), COORD(y), v, bg);
-               ds->grid[y*ds->w+x] = (bg == COL_BACKGROUND ? v : -10);
+           if (ds->grid[y*ds->w+x] != v || bg != ds->bg) {
+               draw_tile(dr, ds, COORD(x), COORD(y), v, bg);
+               ds->grid[y*ds->w+x] = v;
            }
        }
+    ds->bg = bg;
 
     if (!state->layout->mines)
        mines = state->layout->n;
@@ -2896,7 +2992,7 @@ static void game_redraw(frontend *fe, game_drawstate *ds, game_state *oldstate,
         if (ui->deaths)
             sprintf(statusbar + strlen(statusbar),
                     "  Deaths: %d", ui->deaths);
-       status_bar(fe, statusbar);
+       status_bar(dr, statusbar);
     }
 }
 
@@ -2930,13 +3026,21 @@ static int game_wants_statusbar(void)
     return TRUE;
 }
 
-static int game_timing_state(game_state *state)
+static int game_timing_state(game_state *state, game_ui *ui)
 {
-    if (state->dead || state->won || !state->layout->mines)
+    if (state->dead || state->won || ui->completed || !state->layout->mines)
        return FALSE;
     return TRUE;
 }
 
+static void game_print_size(game_params *params, float *x, float *y)
+{
+}
+
+static void game_print(drawing *dr, game_state *state, int tilesize)
+{
+}
+
 #ifdef COMBINED
 #define thegame mines
 #endif
@@ -2952,7 +3056,6 @@ const struct game thegame = {
     TRUE, game_configure, custom_params,
     validate_params,
     new_game_desc,
-    game_free_aux_info,
     validate_desc,
     new_game,
     dup_game,
@@ -2961,15 +3064,19 @@ const struct game thegame = {
     TRUE, game_text_format,
     new_ui,
     free_ui,
+    encode_ui,
+    decode_ui,
     game_changed_state,
-    make_move,
-    game_size,
+    interpret_move,
+    execute_move,
+    PREFERRED_TILE_SIZE, game_compute_size, game_set_size,
     game_colours,
     game_new_drawstate,
     game_free_drawstate,
     game_redraw,
     game_anim_length,
     game_flash_length,
+    FALSE, FALSE, game_print_size, game_print,
     game_wants_statusbar,
     TRUE, game_timing_state,
     BUTTON_BEATS(LEFT_BUTTON, RIGHT_BUTTON),
@@ -2989,25 +3096,25 @@ const struct game thegame = {
  * $ ./mineobfusc 9x9:4,4,004000007c00010022080
  * 9x9:4,4,mb071b49fbd1cb6a0d5868
  *
- * gcc -DSTANDALONE_OBFUSCATOR -o mineobfusc mines.c malloc.c random.c tree234.c
+ * gcc -DSTANDALONE_OBFUSCATOR -o mineobfusc mines.c malloc.c random.c tree234.c misc.c
  */
 
 #include <stdarg.h>
 
 void frontend_default_colour(frontend *fe, float *output) {}
-void draw_text(frontend *fe, int x, int y, int fonttype, int fontsize,
+void draw_text(drawing *dr, int x, int y, int fonttype, int fontsize,
                int align, int colour, char *text) {}
-void draw_rect(frontend *fe, int x, int y, int w, int h, int colour) {}
-void draw_line(frontend *fe, int x1, int y1, int x2, int y2, int colour) {}
-void draw_polygon(frontend *fe, int *coords, int npoints,
-                  int fill, int colour) {}
-void clip(frontend *fe, int x, int y, int w, int h) {}
-void unclip(frontend *fe) {}
-void start_draw(frontend *fe) {}
-void draw_update(frontend *fe, int x, int y, int w, int h) {}
-void end_draw(frontend *fe) {}
-void midend_supersede_game_desc(midend_data *me, char *desc) {}
-void status_bar(frontend *fe, char *text) {}
+void draw_rect(drawing *dr, int x, int y, int w, int h, int colour) {}
+void draw_line(drawing *dr, int x1, int y1, int x2, int y2, int colour) {}
+void draw_polygon(drawing *dr, int *coords, int npoints,
+                  int fillcolour, int outlinecolour) {}
+void clip(drawing *dr, int x, int y, int w, int h) {}
+void unclip(drawing *dr) {}
+void start_draw(drawing *dr) {}
+void draw_update(drawing *dr, int x, int y, int w, int h) {}
+void end_draw(drawing *dr) {}
+void midend_supersede_game_desc(midend *me, char *desc, char *privdesc) {}
+void status_bar(drawing *dr, char *text) {}
 
 void fatal(char *fmt, ...)
 {
@@ -3027,15 +3134,13 @@ int main(int argc, char **argv)
 {
     game_params *p;
     game_state *s;
-    int recurse = TRUE;
     char *id = NULL, *desc, *err;
     int y, x;
-    int grade = FALSE;
 
     while (--argc > 0) {
         char *p = *++argv;
        if (*p == '-') {
-            fprintf(stderr, "%s: unrecognised option `%s'\n", argv[0]);
+            fprintf(stderr, "%s: unrecognised option `%s'\n", argv[0], p);
             return 1;
         } else {
             id = p;