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flood.c
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flood.c
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/*
* flood.c: puzzle in which you make a grid all the same colour by
* repeatedly flood-filling the top left corner, and try to do so in
* as few moves as possible.
*/
/*
* Possible further work:
*
* - UI: perhaps we should only permit clicking on regions that can
* actually be reached by the next flood-fill - i.e. a click is
* only interpreted as a move if it would cause the clicked-on
* square to become part of the controlled area. This provides a
* hint in cases where you mistakenly thought that would happen,
* and protects you against typos in cases where you just
* mis-aimed.
*
* - UI: perhaps mark the fill square in some way? Or even mark the
* whole connected component _containing_ the fill square. Pro:
* that would make it easier to tell apart cases where almost all
* the yellow squares in the grid are part of the target component
* (hence, yellow is _done_ and you never have to fill in that
* colour again) from cases where there's still one yellow square
* that's only diagonally adjacent and hence will need coming back
* to. Con: but it would almost certainly be ugly.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
#include <limits.h>
#ifdef NO_TGMATH_H
# include <math.h>
#else
# include <tgmath.h>
#endif
#include "puzzles.h"
enum {
COL_BACKGROUND, COL_SEPARATOR,
COL_1, COL_2, COL_3, COL_4, COL_5, COL_6, COL_7, COL_8, COL_9, COL_10,
COL_HIGHLIGHT, COL_LOWLIGHT,
NCOLOURS
};
struct game_params {
int w, h;
int colours;
int leniency;
};
/* Just in case I want to make this changeable later, I'll put the
* coordinates of the flood-fill point here so that it'll be easy to
* find everywhere later that has to change. */
#define FILLX 0
#define FILLY 0
typedef struct soln {
int refcount;
int nmoves;
char *moves;
} soln;
struct game_state {
int w, h, colours;
int moves, movelimit;
bool complete;
char *grid;
bool cheated;
int solnpos;
soln *soln;
};
static game_params *default_params(void)
{
game_params *ret = snew(game_params);
ret->w = ret->h = 12;
ret->colours = 6;
ret->leniency = 5;
return ret;
}
static const struct {
struct game_params preset;
const char *name;
} flood_presets[] = {
/* Default 12x12 size, three difficulty levels. */
{{12, 12, 6, 5}, "12x12 Easy"},
{{12, 12, 6, 2}, "12x12 Medium"},
{{12, 12, 6, 0}, "12x12 Hard"},
/* Larger puzzles, leaving off Easy in the expectation that people
* wanting a bigger grid will have played it enough to find Easy
* easy. */
{{16, 16, 6, 2}, "16x16 Medium"},
{{16, 16, 6, 0}, "16x16 Hard"},
/* A couple of different colour counts. It seems generally not too
* hard with fewer colours (probably because fewer choices), so no
* extra moves for these modes. */
{{12, 12, 3, 0}, "12x12, 3 colours"},
{{12, 12, 4, 0}, "12x12, 4 colours"},
};
static bool game_fetch_preset(int i, char **name, game_params **params)
{
game_params *ret;
if (i < 0 || i >= lenof(flood_presets))
return false;
ret = snew(game_params);
*ret = flood_presets[i].preset;
*name = dupstr(flood_presets[i].name);
*params = ret;
return true;
}
static void free_params(game_params *params)
{
sfree(params);
}
static game_params *dup_params(const game_params *params)
{
game_params *ret = snew(game_params);
*ret = *params; /* structure copy */
return ret;
}
static void decode_params(game_params *ret, char const *string)
{
ret->w = ret->h = atoi(string);
while (*string && isdigit((unsigned char)*string)) string++;
if (*string == 'x') {
string++;
ret->h = atoi(string);
while (*string && isdigit((unsigned char)*string)) string++;
}
while (*string) {
if (*string == 'c') {
string++;
ret->colours = atoi(string);
while (*string && isdigit((unsigned char)*string)) string++;
} else if (*string == 'm') {
string++;
ret->leniency = atoi(string);
while (*string && isdigit((unsigned char)*string)) string++;
} else
string++;
}
}
static char *encode_params(const game_params *params, bool full)
{
char buf[256];
sprintf(buf, "%dx%d", params->w, params->h);
if (full)
sprintf(buf + strlen(buf), "c%dm%d",
params->colours, params->leniency);
return dupstr(buf);
}
static config_item *game_configure(const game_params *params)
{
config_item *ret;
char buf[80];
ret = snewn(5, config_item);
ret[0].name = "Width";
ret[0].type = C_STRING;
sprintf(buf, "%d", params->w);
ret[0].u.string.sval = dupstr(buf);
ret[1].name = "Height";
ret[1].type = C_STRING;
sprintf(buf, "%d", params->h);
ret[1].u.string.sval = dupstr(buf);
ret[2].name = "Colours";
ret[2].type = C_STRING;
sprintf(buf, "%d", params->colours);
ret[2].u.string.sval = dupstr(buf);
ret[3].name = "Extra moves permitted";
ret[3].type = C_STRING;
sprintf(buf, "%d", params->leniency);
ret[3].u.string.sval = dupstr(buf);
ret[4].name = NULL;
ret[4].type = C_END;
return ret;
}
static game_params *custom_params(const config_item *cfg)
{
game_params *ret = snew(game_params);
ret->w = atoi(cfg[0].u.string.sval);
ret->h = atoi(cfg[1].u.string.sval);
ret->colours = atoi(cfg[2].u.string.sval);
ret->leniency = atoi(cfg[3].u.string.sval);
return ret;
}
static const char *validate_params(const game_params *params, bool full)
{
if (params->w < 2 && params->h < 2)
return "Grid must contain at least two squares";
if (params->w < 1 || params->h < 1)
return "Width and height must be at least one";
if (params->w > INT_MAX / params->h)
return "Width times height must not be unreasonably large";
if (params->colours < 3 || params->colours > 10)
return "Must have between 3 and 10 colours";
if (params->leniency < 0)
return "Leniency must be non-negative";
return NULL;
}
#if 0
/*
* Bodge to permit varying the recursion depth for testing purposes.
To test two Floods against each other:
paste <(./flood.1 --generate 100 12x12c6m0#12345 | cut -f2 -d,) <(./flood.2 --generate 100 12x12c6m0#12345 | cut -f2 -d,) | awk '{print $2-$1}' | sort -n | uniq -c | awk '{print $2,$1}' | tee z
and then run gnuplot and plot "z".
*/
static int rdepth = 0;
#define RECURSION_DEPTH (rdepth)
void check_recursion_depth(void)
{
if (!rdepth) {
const char *depthstr = getenv("FLOOD_DEPTH");
rdepth = depthstr ? atoi(depthstr) : 1;
rdepth = rdepth > 0 ? rdepth : 1;
}
}
#else
/*
* Last time I empirically checked this, depth 3 was a noticeable
* improvement on 2, but 4 only negligibly better than 3.
*/
#define RECURSION_DEPTH 3
#define check_recursion_depth() (void)0
#endif
struct solver_scratch {
int *queue[2];
int *dist;
char *grid, *grid2;
char *rgrids;
};
static struct solver_scratch *new_scratch(int w, int h)
{
int wh = w*h;
struct solver_scratch *scratch = snew(struct solver_scratch);
check_recursion_depth();
scratch->queue[0] = snewn(wh, int);
scratch->queue[1] = snewn(wh, int);
scratch->dist = snewn(wh, int);
scratch->grid = snewn(wh, char);
scratch->grid2 = snewn(wh, char);
scratch->rgrids = snewn(wh * RECURSION_DEPTH, char);
return scratch;
}
static void free_scratch(struct solver_scratch *scratch)
{
sfree(scratch->queue[0]);
sfree(scratch->queue[1]);
sfree(scratch->dist);
sfree(scratch->grid);
sfree(scratch->grid2);
sfree(scratch->rgrids);
sfree(scratch);
}
#if 0
/* Diagnostic routines you can uncomment if you need them */
void dump_grid(int w, int h, const char *grid, const char *titlefmt, ...)
{
int x, y;
if (titlefmt) {
va_list ap;
va_start(ap, titlefmt);
vprintf(titlefmt, ap);
va_end(ap);
printf(":\n");
} else {
printf("Grid:\n");
}
for (y = 0; y < h; y++) {
printf(" ");
for (x = 0; x < w; x++) {
printf("%1x", grid[y*w+x]);
}
printf("\n");
}
}
void dump_dist(int w, int h, const int *dists, const char *titlefmt, ...)
{
int x, y;
if (titlefmt) {
va_list ap;
va_start(ap, titlefmt);
vprintf(titlefmt, ap);
va_end(ap);
printf(":\n");
} else {
printf("Distances:\n");
}
for (y = 0; y < h; y++) {
printf(" ");
for (x = 0; x < w; x++) {
printf("%3d", dists[y*w+x]);
}
printf("\n");
}
}
#endif
/*
* Search a grid to find the most distant square(s). Return their
* distance and the number of them, and also the number of squares in
* the current controlled set (i.e. at distance zero).
*/
static void search(int w, int h, char *grid, int x0, int y0,
struct solver_scratch *scratch,
int *rdist, int *rnumber, int *rcontrol)
{
int wh = w*h;
int i, qcurr, qhead, qtail, qnext, currdist, remaining;
for (i = 0; i < wh; i++)
scratch->dist[i] = -1;
scratch->queue[0][0] = y0*w+x0;
scratch->queue[1][0] = y0*w+x0;
scratch->dist[y0*w+x0] = 0;
currdist = 0;
qcurr = 0;
qtail = 0;
qhead = 1;
qnext = 1;
remaining = wh - 1;
while (1) {
if (qtail == qhead) {
/* Switch queues. */
if (currdist == 0)
*rcontrol = qhead;
currdist++;
qcurr ^= 1; /* switch queues */
qhead = qnext;
qtail = 0;
qnext = 0;
#if 0
printf("switch queue, new dist %d, queue %d\n", currdist, qhead);
#endif
} else if (remaining == 0 && qnext == 0) {
break;
} else {
int pos = scratch->queue[qcurr][qtail++];
int y = pos / w;
int x = pos % w;
#if 0
printf("checking neighbours of %d,%d\n", x, y);
#endif
int dir;
for (dir = 0; dir < 4; dir++) {
int y1 = y + (dir == 1 ? 1 : dir == 3 ? -1 : 0);
int x1 = x + (dir == 0 ? 1 : dir == 2 ? -1 : 0);
if (0 <= x1 && x1 < w && 0 <= y1 && y1 < h) {
int pos1 = y1*w+x1;
#if 0
printf("trying %d,%d: colours %d-%d dist %d\n", x1, y1,
grid[pos], grid[pos1], scratch->dist[pos]);
#endif
if (scratch->dist[pos1] == -1 &&
((grid[pos1] == grid[pos] &&
scratch->dist[pos] == currdist) ||
(grid[pos1] != grid[pos] &&
scratch->dist[pos] == currdist - 1))) {
#if 0
printf("marking %d,%d dist %d\n", x1, y1, currdist);
#endif
scratch->queue[qcurr][qhead++] = pos1;
scratch->queue[qcurr^1][qnext++] = pos1;
scratch->dist[pos1] = currdist;
remaining--;
}
}
}
}
}
*rdist = currdist;
*rnumber = qhead;
if (currdist == 0)
*rcontrol = qhead;
}
/*
* Enact a flood-fill move on a grid.
*/
static void fill(int w, int h, char *grid, int x0, int y0, char newcolour,
int *queue)
{
char oldcolour;
int qhead, qtail;
oldcolour = grid[y0*w+x0];
assert(oldcolour != newcolour);
grid[y0*w+x0] = newcolour;
queue[0] = y0*w+x0;
qtail = 0;
qhead = 1;
while (qtail < qhead) {
int pos = queue[qtail++];
int y = pos / w;
int x = pos % w;
int dir;
for (dir = 0; dir < 4; dir++) {
int y1 = y + (dir == 1 ? 1 : dir == 3 ? -1 : 0);
int x1 = x + (dir == 0 ? 1 : dir == 2 ? -1 : 0);
if (0 <= x1 && x1 < w && 0 <= y1 && y1 < h) {
int pos1 = y1*w+x1;
if (grid[pos1] == oldcolour) {
grid[pos1] = newcolour;
queue[qhead++] = pos1;
}
}
}
}
}
/*
* Detect a completed grid.
*/
static bool completed(int w, int h, char *grid)
{
int wh = w*h;
int i;
for (i = 1; i < wh; i++)
if (grid[i] != grid[0])
return false;
return true;
}
/*
* Try out every possible move on a grid, and choose whichever one
* reduced the result of search() by the most.
*/
static char choosemove_recurse(int w, int h, char *grid, int x0, int y0,
int maxmove, struct solver_scratch *scratch,
int depth, int *rbestdist, int *rbestnumber, int *rbestcontrol)
{
int wh = w*h;
char move, bestmove;
int dist, number, control, bestdist, bestnumber, bestcontrol;
char *tmpgrid;
assert(0 <= depth && depth < RECURSION_DEPTH);
tmpgrid = scratch->rgrids + depth*wh;
bestdist = wh + 1;
bestnumber = 0;
bestcontrol = 0;
bestmove = -1;
#if 0
dump_grid(w, h, grid, "before choosemove_recurse %d", depth);
#endif
for (move = 0; move < maxmove; move++) {
if (grid[y0*w+x0] == move)
continue;
memcpy(tmpgrid, grid, wh * sizeof(*grid));
fill(w, h, tmpgrid, x0, y0, move, scratch->queue[0]);
if (completed(w, h, tmpgrid)) {
/*
* A move that wins is immediately the best, so stop
* searching. Record what depth of recursion that happened
* at, so that higher levels will choose a move that gets
* to a winning position sooner.
*/
*rbestdist = -1;
*rbestnumber = depth;
*rbestcontrol = wh;
return move;
}
if (depth < RECURSION_DEPTH-1) {
choosemove_recurse(w, h, tmpgrid, x0, y0, maxmove, scratch,
depth+1, &dist, &number, &control);
} else {
#if 0
dump_grid(w, h, tmpgrid, "after move %d at depth %d",
move, depth);
#endif
search(w, h, tmpgrid, x0, y0, scratch, &dist, &number, &control);
#if 0
dump_dist(w, h, scratch->dist, "after move %d at depth %d",
move, depth);
printf("move %d at depth %d: %d at %d\n",
depth, move, number, dist);
#endif
}
if (dist < bestdist ||
(dist == bestdist &&
(number < bestnumber ||
(number == bestnumber &&
(control > bestcontrol))))) {
bestdist = dist;
bestnumber = number;
bestcontrol = control;
bestmove = move;
}
}
#if 0
printf("best at depth %d was %d (%d at %d, %d controlled)\n",
depth, bestmove, bestnumber, bestdist, bestcontrol);
#endif
*rbestdist = bestdist;
*rbestnumber = bestnumber;
*rbestcontrol = bestcontrol;
return bestmove;
}
static char choosemove(int w, int h, char *grid, int x0, int y0,
int maxmove, struct solver_scratch *scratch)
{
int tmp0, tmp1, tmp2;
return choosemove_recurse(w, h, grid, x0, y0, maxmove, scratch,
0, &tmp0, &tmp1, &tmp2);
}
static char *new_game_desc(const game_params *params, random_state *rs,
char **aux, bool interactive)
{
int w = params->w, h = params->h, wh = w*h;
int i, moves;
char *desc;
struct solver_scratch *scratch;
scratch = new_scratch(w, h);
/*
* Invent a random grid.
*/
do {
for (i = 0; i < wh; i++)
scratch->grid[i] = random_upto(rs, params->colours);
} while (completed(w, h, scratch->grid));
/*
* Run the solver, and count how many moves it uses.
*/
memcpy(scratch->grid2, scratch->grid, wh * sizeof(*scratch->grid2));
moves = 0;
check_recursion_depth();
while (!completed(w, h, scratch->grid2)) {
char move = choosemove(w, h, scratch->grid2, FILLX, FILLY,
params->colours, scratch);
fill(w, h, scratch->grid2, FILLX, FILLY, move, scratch->queue[0]);
moves++;
}
/*
* Adjust for difficulty.
*/
moves += params->leniency;
/*
* Encode the game id.
*/
desc = snewn(wh + 40, char);
for (i = 0; i < wh; i++) {
char colour = scratch->grid[i];
char textcolour = (colour > 9 ? 'A' : '0') + colour;
desc[i] = textcolour;
}
sprintf(desc+i, ",%d", moves);
free_scratch(scratch);
return desc;
}
static const char *validate_desc(const game_params *params, const char *desc)
{
int w = params->w, h = params->h, wh = w*h;
int i;
for (i = 0; i < wh; i++) {
char c = *desc++;
if (c == 0)
return "Not enough data in grid description";
if (c >= '0' && c <= '9')
c -= '0';
else if (c >= 'A' && c <= 'Z')
c = 10 + (c - 'A');
else
return "Bad character in grid description";
if ((unsigned)c >= params->colours)
return "Colour out of range in grid description";
}
if (*desc != ',')
return "Expected ',' after grid description";
desc++;
if (desc[strspn(desc, "0123456789")])
return "Badly formatted move limit after grid description";
return NULL;
}
static game_state *new_game(midend *me, const game_params *params,
const char *desc)
{
int w = params->w, h = params->h, wh = w*h;
game_state *state = snew(game_state);
int i;
state->w = w;
state->h = h;
state->colours = params->colours;
state->moves = 0;
state->grid = snewn(wh, char);
for (i = 0; i < wh; i++) {
char c = *desc++;
assert(c);
if (c >= '0' && c <= '9')
c -= '0';
else if (c >= 'A' && c <= 'Z')
c = 10 + (c - 'A');
else
assert(!"bad colour");
state->grid[i] = c;
}
assert(*desc == ',');
desc++;
state->movelimit = atoi(desc);
state->complete = false;
state->cheated = false;
state->solnpos = 0;
state->soln = NULL;
return state;
}
static game_state *dup_game(const game_state *state)
{
game_state *ret = snew(game_state);
ret->w = state->w;
ret->h = state->h;
ret->colours = state->colours;
ret->moves = state->moves;
ret->movelimit = state->movelimit;
ret->complete = state->complete;
ret->grid = snewn(state->w * state->h, char);
memcpy(ret->grid, state->grid, state->w * state->h * sizeof(*ret->grid));
ret->cheated = state->cheated;
ret->soln = state->soln;
if (ret->soln)
ret->soln->refcount++;
ret->solnpos = state->solnpos;
return ret;
}
static void free_game(game_state *state)
{
if (state->soln && --state->soln->refcount == 0) {
sfree(state->soln->moves);
sfree(state->soln);
}
sfree(state->grid);
sfree(state);
}
static char *solve_game(const game_state *state, const game_state *currstate,
const char *aux, const char **error)
{
int w = state->w, h = state->h, wh = w*h;
char *moves, *ret, *p;
int i, len, nmoves;
char buf[256];
struct solver_scratch *scratch;
if (currstate->complete) {
*error = "Puzzle is already solved";
return NULL;
}
/*
* Find the best solution our solver can give.
*/
moves = snewn(wh, char); /* sure to be enough */
nmoves = 0;
scratch = new_scratch(w, h);
memcpy(scratch->grid2, currstate->grid, wh * sizeof(*scratch->grid2));
check_recursion_depth();
while (!completed(w, h, scratch->grid2)) {
char move = choosemove(w, h, scratch->grid2, FILLX, FILLY,
currstate->colours, scratch);
fill(w, h, scratch->grid2, FILLX, FILLY, move, scratch->queue[0]);
assert(nmoves < wh);
moves[nmoves++] = move;
}
free_scratch(scratch);
/*
* Encode it as a move string.
*/
len = 1; /* trailing NUL */
for (i = 0; i < nmoves; i++)
len += sprintf(buf, ",%d", moves[i]);
ret = snewn(len, char);
p = ret;
for (i = 0; i < nmoves; i++)
p += sprintf(p, "%c%d", (i==0 ? 'S' : ','), moves[i]);
assert(p - ret == len - 1);
sfree(moves);
return ret;
}
static bool game_can_format_as_text_now(const game_params *params)
{
return true;
}
static char *game_text_format(const game_state *state)
{
int w = state->w, h = state->h;
char *ret, *p;
int x, y, len;
len = h * (w+1); /* +1 for newline after each row */
ret = snewn(len+1, char); /* and +1 for terminating \0 */
p = ret;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
char colour = state->grid[y*w+x];
char textcolour = (colour > 9 ? 'A' : '0') + colour;
*p++ = textcolour;
}
*p++ = '\n';
}
assert(p - ret == len);
*p = '\0';
return ret;
}
struct game_ui {
bool cursor_visible;
int cx, cy;
enum { VICTORY, DEFEAT } flash_type;
};
static game_ui *new_ui(const game_state *state)
{
struct game_ui *ui = snew(struct game_ui);
ui->cursor_visible = getenv_bool("PUZZLES_SHOW_CURSOR", false);
ui->cx = FILLX;
ui->cy = FILLY;
return ui;
}
static void free_ui(game_ui *ui)
{
sfree(ui);
}
static char *encode_ui(const game_ui *ui)
{
return NULL;
}
static void decode_ui(game_ui *ui, const char *encoding)
{
}
static void game_changed_state(game_ui *ui, const game_state *oldstate,
const game_state *newstate)
{
}
static const char *current_key_label(const game_ui *ui,
const game_state *state, int button)
{
if (button == CURSOR_SELECT &&
state->grid[0] != state->grid[ui->cy*state->w+ui->cx])
return "Fill";
if (button == CURSOR_SELECT2 &&
state->soln && state->solnpos < state->soln->nmoves)
return "Advance";
return "";
}
struct game_drawstate {
bool started;
int tilesize;
int *grid;
};
#define TILESIZE (ds->tilesize)
#define PREFERRED_TILESIZE 32
#define BORDER (TILESIZE / 2)
#define SEP_WIDTH (TILESIZE / 32)
#define CURSOR_INSET (TILESIZE / 8)
#define HIGHLIGHT_WIDTH (TILESIZE / 10)
#define COORD(x) ( (x) * TILESIZE + BORDER )
#define FROMCOORD(x) ( ((x) - BORDER + TILESIZE) / TILESIZE - 1 )
#define VICTORY_FLASH_FRAME 0.03F
#define DEFEAT_FLASH_FRAME 0.10F
static char *interpret_move(const game_state *state, game_ui *ui,
const game_drawstate *ds,
int x, int y, int button)
{
int w = state->w, h = state->h;
int tx = -1, ty = -1, move = -1;
if (button == LEFT_BUTTON) {
tx = FROMCOORD(x);
ty = FROMCOORD(y);
ui->cursor_visible = false;
} else if (button == CURSOR_LEFT && ui->cx > 0) {
ui->cx--;
ui->cursor_visible = true;
return UI_UPDATE;
} else if (button == CURSOR_RIGHT && ui->cx+1 < w) {
ui->cx++;
ui->cursor_visible = true;
return UI_UPDATE;
} else if (button == CURSOR_UP && ui->cy > 0) {
ui->cy--;
ui->cursor_visible = true;
return UI_UPDATE;
} else if (button == CURSOR_DOWN && ui->cy+1 < h) {
ui->cy++;
ui->cursor_visible = true;
return UI_UPDATE;
} else if (button == CURSOR_SELECT) {
tx = ui->cx;
ty = ui->cy;
} else if (button == CURSOR_SELECT2 &&
state->soln && state->solnpos < state->soln->nmoves) {
move = state->soln->moves[state->solnpos];
} else {
return NULL;
}
if (tx >= 0 && tx < w && ty >= 0 && ty < h &&
state->grid[0] != state->grid[ty*w+tx])
move = state->grid[ty*w+tx];
if (move >= 0 && !state->complete) {
char buf[256];
sprintf(buf, "M%d", move);
return dupstr(buf);
}
return NULL;
}
static game_state *execute_move(const game_state *state, const char *move)
{
game_state *ret;
int c;
if (move[0] == 'M' &&
sscanf(move+1, "%d", &c) == 1 &&
c >= 0 && c < state->colours &&
c != state->grid[FILLY * state->w + FILLX] &&
!state->complete) {
int *queue = snewn(state->w * state->h, int);
ret = dup_game(state);
fill(ret->w, ret->h, ret->grid, FILLX, FILLY, c, queue);
ret->moves++;
ret->complete = completed(ret->w, ret->h, ret->grid);
if (ret->soln) {
/*
* If this move is the correct next one in the stored
* solution path, advance solnpos.
*/
if (c == ret->soln->moves[ret->solnpos] &&
ret->solnpos+1 < ret->soln->nmoves) {
ret->solnpos++;
} else {
/*
* Otherwise, the user has strayed from the path or
* else the path has come to an end; either way, the
* path is no longer valid.
*/
ret->soln->refcount--;
assert(ret->soln->refcount > 0);/* `state' at least still exists */
ret->soln = NULL;
ret->solnpos = 0;
}
}
sfree(queue);
return ret;
} else if (*move == 'S') {
soln *sol;
const char *p;
int i;
/*
* This is a solve move, so we don't actually _change_ the
* grid but merely set up a stored solution path.
*/
move++;
sol = snew(soln);
sol->nmoves = 1;
for (p = move; *p; p++) {
if (*p == ',')
sol->nmoves++;
}
sol->moves = snewn(sol->nmoves, char);
for (i = 0, p = move; i < sol->nmoves; i++) {
if (!*p) {
badsolve:
sfree(sol->moves);
sfree(sol);
return NULL;
};
sol->moves[i] = atoi(p);
if (sol->moves[i] < 0 || sol->moves[i] >= state->colours ||
(i == 0 ?
sol->moves[i] == state->grid[FILLY * state->w + FILLX] :
sol->moves[i] == sol->moves[i-1]))
/* Solution contains a fill with an invalid colour or
* the current colour. */
goto badsolve;
p += strspn(p, "0123456789");
if (*p) {
if (*p != ',') goto badsolve;
p++;
}
}
ret = dup_game(state);
ret->cheated = true;
if (ret->soln && --ret->soln->refcount == 0) {
sfree(ret->soln->moves);
sfree(ret->soln);
}
ret->soln = sol;
ret->solnpos = 0;
sol->refcount = 1;
return ret;
}
return NULL;
}
/* ----------------------------------------------------------------------
* Drawing routines.
*/
static void game_compute_size(const game_params *params, int tilesize,
int *x, int *y)
{
/* Ick: fake up `ds->tilesize' for macro expansion purposes */
struct { int tilesize; } ads, *ds = &ads;
ads.tilesize = tilesize;
*x = BORDER * 2 + TILESIZE * params->w;
*y = BORDER * 2 + TILESIZE * params->h;
}
static void game_set_size(drawing *dr, game_drawstate *ds,
const game_params *params, int tilesize)
{
ds->tilesize = tilesize;
}