gtk.c

   1 /*
   2  * gtk.c: GTK front end for my puzzle collection.
   3  */
   4
   5 #include <stdio.h>
   6 #include <assert.h>
   7 #include <stdlib.h>
   8 #include <time.h>
   9 #include <stdarg.h>
  10 #include <string.h>
  11 #include <errno.h>
  12 #include <math.h>
  13
  14 #include <sys/time.h>
  15 #include <sys/resource.h>
  16
  17 #include <gtk/gtk.h>
  18 #include <gdk/gdkkeysyms.h>
  19
  20 #include <gdk-pixbuf/gdk-pixbuf.h>
  21
  22 #include <gdk/gdkx.h>
  23 #include <X11/Xlib.h>
  24 #include <X11/Xutil.h>
  25 #include <X11/Xatom.h>
  26
  27 #include "puzzles.h"
  28
  29 #if GTK_CHECK_VERSION(2,0,0)
  30 # define USE_PANGO
  31 # ifdef PANGO_VERSION_CHECK
  32 #  if PANGO_VERSION_CHECK(1,8,0)
  33 #   define HAVE_SENSIBLE_ABSOLUTE_SIZE_FUNCTION
  34 #  endif
  35 # endif
  36 #endif
  37 #if !GTK_CHECK_VERSION(2,4,0)
  38 # define OLD_FILESEL
  39 #endif
  40 #if GTK_CHECK_VERSION(2,8,0)
  41 # define USE_CAIRO
  42 # if GTK_CHECK_VERSION(3,0,0) || defined(GDK_DISABLE_DEPRECATED)
  43 #  define USE_CAIRO_WITHOUT_PIXMAP
  44 # endif
  45 #endif
  46
  47 #if GTK_CHECK_VERSION(3,0,0)
  48 /* The old names are still more concise! */
  49 #define gtk_hbox_new(x,y) gtk_box_new(GTK_ORIENTATION_HORIZONTAL,y)
  50 #define gtk_vbox_new(x,y) gtk_box_new(GTK_ORIENTATION_VERTICAL,y)
  51 /* GTK 3 has retired stock button labels */
  52 #define LABEL_OK "_OK"
  53 #define LABEL_CANCEL "_Cancel"
  54 #define LABEL_NO "_No"
  55 #define LABEL_YES "_Yes"
  56 #define LABEL_SAVE "_Save"
  57 #define LABEL_OPEN "_Open"
  58 #define gtk_button_new_with_our_label gtk_button_new_with_mnemonic
  59 #else
  60 #define LABEL_OK GTK_STOCK_OK
  61 #define LABEL_CANCEL GTK_STOCK_CANCEL
  62 #define LABEL_NO GTK_STOCK_NO
  63 #define LABEL_YES GTK_STOCK_YES
  64 #define LABEL_SAVE GTK_STOCK_SAVE
  65 #define LABEL_OPEN GTK_STOCK_OPEN
  66 #define gtk_button_new_with_our_label gtk_button_new_from_stock
  67 #endif
  68
  69 /* #undef USE_CAIRO */
  70 /* #define NO_THICK_LINE */
  71 #ifdef DEBUGGING
  72 static FILE *debug_fp = NULL;
  73
  74 void dputs(char *buf)
  75 {
  76     if (!debug_fp) {
  77         debug_fp = fopen("debug.log", "w");
  78     }
  79
  80     fputs(buf, stderr);
  81
  82     if (debug_fp) {
  83         fputs(buf, debug_fp);
  84         fflush(debug_fp);
  85     }
  86 }
  87
  88 void debug_printf(char *fmt, ...)
  89 {
  90     char buf[4096];
  91     va_list ap;
  92
  93     va_start(ap, fmt);
  94     vsprintf(buf, fmt, ap);
  95     dputs(buf);
  96     va_end(ap);
  97 }
  98 #endif
  99
 100 /* ----------------------------------------------------------------------
 101  * Error reporting functions used elsewhere.
 102  */
 103
 104 void fatal(char *fmt, ...)
 105 {
 106     va_list ap;
 107
 108     fprintf(stderr, "fatal error: ");
 109
 110     va_start(ap, fmt);
 111     vfprintf(stderr, fmt, ap);
 112     va_end(ap);
 113
 114     fprintf(stderr, "\n");
 115     exit(1);
 116 }
 117
 118 /* ----------------------------------------------------------------------
 119  * GTK front end to puzzles.
 120  */
 121
 122 static void changed_preset(frontend *fe);
 123
 124 struct font {
 125 #ifdef USE_PANGO
 126     PangoFontDescription *desc;
 127 #else
 128     GdkFont *font;
 129 #endif
 130     int type;
 131     int size;
 132 };
 133
 134 /*
 135  * This structure holds all the data relevant to a single window.
 136  * In principle this would allow us to open multiple independent
 137  * puzzle windows, although I can't currently see any real point in
 138  * doing so. I'm just coding cleanly because there's no
 139  * particularly good reason not to.
 140  */
 141 struct frontend {
 142     GtkWidget *window;
 143     GtkAccelGroup *accelgroup;
 144     GtkWidget *area;
 145     GtkWidget *statusbar;
 146     GtkWidget *menubar;
 147 #if GTK_CHECK_VERSION(3,20,0)
 148     GtkCssProvider *css_provider;
 149 #endif
 150     guint statusctx;
 151     int w, h;
 152     midend *me;
 153 #ifdef USE_CAIRO
 154     const float *colours;
 155     cairo_t *cr;
 156     cairo_surface_t *image;
 157 #ifndef USE_CAIRO_WITHOUT_PIXMAP
 158     GdkPixmap *pixmap;
 159 #endif
 160     GdkColor background;               /* for painting outside puzzle area */
 161 #else
 162     GdkPixmap *pixmap;
 163     GdkGC *gc;
 164     GdkColor *colours;
 165     GdkColormap *colmap;
 166     int backgroundindex;               /* which of colours[] is background */
 167 #endif
 168     int ncolours;
 169     int bbox_l, bbox_r, bbox_u, bbox_d;
 170     int timer_active, timer_id;
 171     struct timeval last_time;
 172     struct font *fonts;
 173     int nfonts, fontsize;
 174     config_item *cfg;
 175     int cfg_which, cfgret;
 176     GtkWidget *cfgbox;
 177     void *paste_data;
 178     int paste_data_len;
 179     int pw, ph;                        /* pixmap size (w, h are area size) */
 180     int ox, oy;                        /* offset of pixmap in drawing area */
 181 #ifdef OLD_FILESEL
 182     char *filesel_name;
 183 #endif
 184     GSList *preset_radio;
 185     int n_preset_menu_items;
 186     int preset_threaded;
 187     GtkWidget *preset_custom;
 188     GtkWidget *copy_menu_item;
 189 #if !GTK_CHECK_VERSION(3,0,0)
 190     int drawing_area_shrink_pending;
 191     int menubar_is_local;
 192 #endif
 193 };
 194
 195 struct blitter {
 196 #ifdef USE_CAIRO
 197     cairo_surface_t *image;
 198 #else
 199     GdkPixmap *pixmap;
 200 #endif
 201     int w, h, x, y;
 202 };
 203
 204 void get_random_seed(void **randseed, int *randseedsize)
 205 {
 206     struct timeval *tvp = snew(struct timeval);
 207     gettimeofday(tvp, NULL);
 208     *randseed = (void *)tvp;
 209     *randseedsize = sizeof(struct timeval);
 210 }
 211
 212 void frontend_default_colour(frontend *fe, float *output)
 213 {
 214 #if !GTK_CHECK_VERSION(3,0,0)
 215     /*
 216      * Use the widget style's default background colour as the
 217      * background for the puzzle drawing area.
 218      */
 219     GdkColor col = gtk_widget_get_style(fe->window)->bg[GTK_STATE_NORMAL];
 220     output[0] = col.red / 65535.0;
 221     output[1] = col.green / 65535.0;
 222     output[2] = col.blue / 65535.0;
 223 #else
 224     /*
 225      * GTK 3 has decided that there's no such thing as a 'default
 226      * background colour' any more, because widget styles might set
 227      * the background to something more complicated like a background
 228      * image. We don't want to get into overlaying our entire puzzle
 229      * on an arbitrary background image, so we'll just make up a
 230      * reasonable shade of grey.
 231      */
 232     output[0] = output[1] = output[2] = 0.9F;
 233 #endif
 234 }
 235
 236 void gtk_status_bar(void *handle, char *text)
 237 {
 238     frontend *fe = (frontend *)handle;
 239
 240     assert(fe->statusbar);
 241
 242     gtk_statusbar_pop(GTK_STATUSBAR(fe->statusbar), fe->statusctx);
 243     gtk_statusbar_push(GTK_STATUSBAR(fe->statusbar), fe->statusctx, text);
 244 }
 245
 246 /* ----------------------------------------------------------------------
 247  * Cairo drawing functions.
 248  */
 249
 250 #ifdef USE_CAIRO
 251
 252 static void setup_drawing(frontend *fe)
 253 {
 254     fe->cr = cairo_create(fe->image);
 255     cairo_set_antialias(fe->cr, CAIRO_ANTIALIAS_GRAY);
 256     cairo_set_line_width(fe->cr, 1.0);
 257     cairo_set_line_cap(fe->cr, CAIRO_LINE_CAP_SQUARE);
 258     cairo_set_line_join(fe->cr, CAIRO_LINE_JOIN_ROUND);
 259 }
 260
 261 static void teardown_drawing(frontend *fe)
 262 {
 263     cairo_destroy(fe->cr);
 264     fe->cr = NULL;
 265
 266 #ifndef USE_CAIRO_WITHOUT_PIXMAP
 267     {
 268         cairo_t *cr = gdk_cairo_create(fe->pixmap);
 269         cairo_set_source_surface(cr, fe->image, 0, 0);
 270         cairo_rectangle(cr,
 271                         fe->bbox_l - 1,
 272                         fe->bbox_u - 1,
 273                         fe->bbox_r - fe->bbox_l + 2,
 274                         fe->bbox_d - fe->bbox_u + 2);
 275         cairo_fill(cr);
 276         cairo_destroy(cr);
 277     }
 278 #endif
 279 }
 280
 281 static void snaffle_colours(frontend *fe)
 282 {
 283     fe->colours = midend_colours(fe->me, &fe->ncolours);
 284 }
 285
 286 static void set_colour(frontend *fe, int colour)
 287 {
 288     cairo_set_source_rgb(fe->cr,
 289                          fe->colours[3*colour + 0],
 290                          fe->colours[3*colour + 1],
 291                          fe->colours[3*colour + 2]);
 292 }
 293
 294 static void set_window_background(frontend *fe, int colour)
 295 {
 296 #if GTK_CHECK_VERSION(3,20,0)
 297     char css_buf[512];
 298     sprintf(css_buf, ".background { "
 299             "background-color: #%02x%02x%02x; }",
 300             (unsigned)(fe->colours[3*colour + 0] * 255),
 301             (unsigned)(fe->colours[3*colour + 1] * 255),
 302             (unsigned)(fe->colours[3*colour + 2] * 255));
 303     if (!fe->css_provider)
 304         fe->css_provider = gtk_css_provider_new();
 305     if (!gtk_css_provider_load_from_data(
 306             GTK_CSS_PROVIDER(fe->css_provider), css_buf, -1, NULL))
 307         assert(0 && "Couldn't load CSS");
 308     gtk_style_context_add_provider(
 309         gtk_widget_get_style_context(fe->window),
 310         GTK_STYLE_PROVIDER(fe->css_provider),
 311         GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
 312     gtk_style_context_add_provider(
 313         gtk_widget_get_style_context(fe->area),
 314         GTK_STYLE_PROVIDER(fe->css_provider),
 315         GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
 316 #elif GTK_CHECK_VERSION(3,0,0)
 317     GdkRGBA rgba;
 318     rgba.red = fe->colours[3*colour + 0];
 319     rgba.green = fe->colours[3*colour + 1];
 320     rgba.blue = fe->colours[3*colour + 2];
 321     rgba.alpha = 1.0;
 322     gdk_window_set_background_rgba(gtk_widget_get_window(fe->area), &rgba);
 323     gdk_window_set_background_rgba(gtk_widget_get_window(fe->window), &rgba);
 324 #else
 325     GdkColormap *colmap;
 326
 327     colmap = gdk_colormap_get_system();
 328     fe->background.red = fe->colours[3*colour + 0] * 65535;
 329     fe->background.green = fe->colours[3*colour + 1] * 65535;
 330     fe->background.blue = fe->colours[3*colour + 2] * 65535;
 331     if (!gdk_colormap_alloc_color(colmap, &fe->background, FALSE, FALSE)) {
 332         g_error("couldn't allocate background (#%02x%02x%02x)\n",
 333                 fe->background.red >> 8, fe->background.green >> 8,
 334                 fe->background.blue >> 8);
 335     }
 336     gdk_window_set_background(gtk_widget_get_window(fe->area),
 337                               &fe->background);
 338     gdk_window_set_background(gtk_widget_get_window(fe->window),
 339                               &fe->background);
 340 #endif
 341 }
 342
 343 static PangoLayout *make_pango_layout(frontend *fe)
 344 {
 345     return (pango_cairo_create_layout(fe->cr));
 346 }
 347
 348 static void draw_pango_layout(frontend *fe, PangoLayout *layout,
 349                               int x, int y)
 350 {
 351     cairo_move_to(fe->cr, x, y);
 352     pango_cairo_show_layout(fe->cr, layout);
 353 }
 354
 355 static void save_screenshot_png(frontend *fe, const char *screenshot_file)
 356 {
 357     cairo_surface_write_to_png(fe->image, screenshot_file);
 358 }
 359
 360 static void do_clip(frontend *fe, int x, int y, int w, int h)
 361 {
 362     cairo_new_path(fe->cr);
 363     cairo_rectangle(fe->cr, x, y, w, h);
 364     cairo_clip(fe->cr);
 365 }
 366
 367 static void do_unclip(frontend *fe)
 368 {
 369     cairo_reset_clip(fe->cr);
 370 }
 371
 372 static void do_draw_rect(frontend *fe, int x, int y, int w, int h)
 373 {
 374     cairo_save(fe->cr);
 375     cairo_new_path(fe->cr);
 376     cairo_set_antialias(fe->cr, CAIRO_ANTIALIAS_NONE);
 377     cairo_rectangle(fe->cr, x, y, w, h);
 378     cairo_fill(fe->cr);
 379     cairo_restore(fe->cr);
 380 }
 381
 382 static void do_draw_line(frontend *fe, int x1, int y1, int x2, int y2)
 383 {
 384     cairo_new_path(fe->cr);
 385     cairo_move_to(fe->cr, x1 + 0.5, y1 + 0.5);
 386     cairo_line_to(fe->cr, x2 + 0.5, y2 + 0.5);
 387     cairo_stroke(fe->cr);
 388 }
 389
 390 static void do_draw_thick_line(frontend *fe, float thickness,
 391                                float x1, float y1, float x2, float y2)
 392 {
 393     cairo_save(fe->cr);
 394     cairo_set_line_width(fe->cr, thickness);
 395     cairo_new_path(fe->cr);
 396     cairo_move_to(fe->cr, x1, y1);
 397     cairo_line_to(fe->cr, x2, y2);
 398     cairo_stroke(fe->cr);
 399     cairo_restore(fe->cr);
 400 }
 401
 402 static void do_draw_poly(frontend *fe, int *coords, int npoints,
 403                          int fillcolour, int outlinecolour)
 404 {
 405     int i;
 406
 407     cairo_new_path(fe->cr);
 408     for (i = 0; i < npoints; i++)
 409         cairo_line_to(fe->cr, coords[i*2] + 0.5, coords[i*2 + 1] + 0.5);
 410     cairo_close_path(fe->cr);
 411     if (fillcolour >= 0) {
 412         set_colour(fe, fillcolour);
 413         cairo_fill_preserve(fe->cr);
 414     }
 415     assert(outlinecolour >= 0);
 416     set_colour(fe, outlinecolour);
 417     cairo_stroke(fe->cr);
 418 }
 419
 420 static void do_draw_circle(frontend *fe, int cx, int cy, int radius,
 421                            int fillcolour, int outlinecolour)
 422 {
 423     cairo_new_path(fe->cr);
 424     cairo_arc(fe->cr, cx + 0.5, cy + 0.5, radius, 0, 2*PI);
 425     cairo_close_path(fe->cr);           /* Just in case... */
 426     if (fillcolour >= 0) {
 427         set_colour(fe, fillcolour);
 428         cairo_fill_preserve(fe->cr);
 429     }
 430     assert(outlinecolour >= 0);
 431     set_colour(fe, outlinecolour);
 432     cairo_stroke(fe->cr);
 433 }
 434
 435 static void setup_blitter(blitter *bl, int w, int h)
 436 {
 437     bl->image = cairo_image_surface_create(CAIRO_FORMAT_RGB24, w, h);
 438 }
 439
 440 static void teardown_blitter(blitter *bl)
 441 {
 442     cairo_surface_destroy(bl->image);
 443 }
 444
 445 static void do_blitter_save(frontend *fe, blitter *bl, int x, int y)
 446 {
 447     cairo_t *cr = cairo_create(bl->image);
 448
 449     cairo_set_source_surface(cr, fe->image, -x, -y);
 450     cairo_paint(cr);
 451     cairo_destroy(cr);
 452 }
 453
 454 static void do_blitter_load(frontend *fe, blitter *bl, int x, int y)
 455 {
 456     cairo_set_source_surface(fe->cr, bl->image, x, y);
 457     cairo_paint(fe->cr);
 458 }
 459
 460 static void clear_backing_store(frontend *fe)
 461 {
 462     fe->image = NULL;
 463 }
 464
 465 static void wipe_and_maybe_destroy_cairo(frontend *fe, cairo_t *cr,
 466                                          int destroy)
 467 {
 468     cairo_set_source_rgb(cr, fe->colours[0], fe->colours[1], fe->colours[2]);
 469     cairo_paint(cr);
 470     if (destroy)
 471         cairo_destroy(cr);
 472 }
 473
 474 static void setup_backing_store(frontend *fe)
 475 {
 476 #ifndef USE_CAIRO_WITHOUT_PIXMAP
 477     fe->pixmap = gdk_pixmap_new(gtk_widget_get_window(fe->area),
 478                                 fe->pw, fe->ph, -1);
 479 #endif
 480     fe->image = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
 481                                            fe->pw, fe->ph);
 482
 483     wipe_and_maybe_destroy_cairo(fe, cairo_create(fe->image), TRUE);
 484 #ifndef USE_CAIRO_WITHOUT_PIXMAP
 485     wipe_and_maybe_destroy_cairo(fe, gdk_cairo_create(fe->pixmap), TRUE);
 486 #endif
 487 #if GTK_CHECK_VERSION(3,22,0)
 488     {
 489         GdkWindow *gdkwin;
 490         cairo_region_t *region;
 491         GdkDrawingContext *drawctx;
 492         cairo_t *cr;
 493
 494         gdkwin = gtk_widget_get_window(fe->area);
 495         region = gdk_window_get_clip_region(gdkwin);
 496         drawctx = gdk_window_begin_draw_frame(gdkwin, region);
 497         cr = gdk_drawing_context_get_cairo_context(drawctx);
 498         wipe_and_maybe_destroy_cairo(fe, cr, FALSE);
 499         gdk_window_end_draw_frame(gdkwin, drawctx);
 500         cairo_region_destroy(region);
 501     }
 502 #else
 503     wipe_and_maybe_destroy_cairo(
 504         fe, gdk_cairo_create(gtk_widget_get_window(fe->area)), TRUE);
 505 #endif
 506 }
 507
 508 static int backing_store_ok(frontend *fe)
 509 {
 510     return (!!fe->image);
 511 }
 512
 513 static void teardown_backing_store(frontend *fe)
 514 {
 515     cairo_surface_destroy(fe->image);
 516 #ifndef USE_CAIRO_WITHOUT_PIXMAP
 517     gdk_pixmap_unref(fe->pixmap);
 518 #endif
 519     fe->image = NULL;
 520 }
 521
 522 #endif
 523
 524 /* ----------------------------------------------------------------------
 525  * GDK drawing functions.
 526  */
 527
 528 #ifndef USE_CAIRO
 529
 530 static void setup_drawing(frontend *fe)
 531 {
 532     fe->gc = gdk_gc_new(fe->area->window);
 533 }
 534
 535 static void teardown_drawing(frontend *fe)
 536 {
 537     gdk_gc_unref(fe->gc);
 538     fe->gc = NULL;
 539 }
 540
 541 static void snaffle_colours(frontend *fe)
 542 {
 543     int i, ncolours;
 544     float *colours;
 545     gboolean *success;
 546
 547     fe->colmap = gdk_colormap_get_system();
 548     colours = midend_colours(fe->me, &ncolours);
 549     fe->ncolours = ncolours;
 550     fe->colours = snewn(ncolours, GdkColor);
 551     for (i = 0; i < ncolours; i++) {
 552         fe->colours[i].red = colours[i*3] * 0xFFFF;
 553         fe->colours[i].green = colours[i*3+1] * 0xFFFF;
 554         fe->colours[i].blue = colours[i*3+2] * 0xFFFF;
 555     }
 556     success = snewn(ncolours, gboolean);
 557     gdk_colormap_alloc_colors(fe->colmap, fe->colours, ncolours,
 558                               FALSE, FALSE, success);
 559     for (i = 0; i < ncolours; i++) {
 560         if (!success[i]) {
 561             g_error("couldn't allocate colour %d (#%02x%02x%02x)\n",
 562                     i, fe->colours[i].red >> 8,
 563                     fe->colours[i].green >> 8,
 564                     fe->colours[i].blue >> 8);
 565         }
 566     }
 567 }
 568
 569 static void set_window_background(frontend *fe, int colour)
 570 {
 571     fe->backgroundindex = colour;
 572     gdk_window_set_background(fe->area->window, &fe->colours[colour]);
 573     gdk_window_set_background(fe->window->window, &fe->colours[colour]);
 574 }
 575
 576 static void set_colour(frontend *fe, int colour)
 577 {
 578     gdk_gc_set_foreground(fe->gc, &fe->colours[colour]);
 579 }
 580
 581 #ifdef USE_PANGO
 582 static PangoLayout *make_pango_layout(frontend *fe)
 583 {
 584     return (pango_layout_new(gtk_widget_get_pango_context(fe->area)));
 585 }
 586
 587 static void draw_pango_layout(frontend *fe, PangoLayout *layout,
 588                               int x, int y)
 589 {
 590     gdk_draw_layout(fe->pixmap, fe->gc, x, y, layout);
 591 }
 592 #endif
 593
 594 static void save_screenshot_png(frontend *fe, const char *screenshot_file)
 595 {
 596     GdkPixbuf *pb;
 597     GError *gerror = NULL;
 598
 599     midend_redraw(fe->me);
 600
 601     pb = gdk_pixbuf_get_from_drawable(NULL, fe->pixmap,
 602                                       NULL, 0, 0, 0, 0, -1, -1);
 603     gdk_pixbuf_save(pb, screenshot_file, "png", &gerror, NULL);
 604 }
 605
 606 static void do_clip(frontend *fe, int x, int y, int w, int h)
 607 {
 608     GdkRectangle rect;
 609
 610     rect.x = x;
 611     rect.y = y;
 612     rect.width = w;
 613     rect.height = h;
 614     gdk_gc_set_clip_rectangle(fe->gc, &rect);
 615 }
 616
 617 static void do_unclip(frontend *fe)
 618 {
 619     GdkRectangle rect;
 620
 621     rect.x = 0;
 622     rect.y = 0;
 623     rect.width = fe->w;
 624     rect.height = fe->h;
 625     gdk_gc_set_clip_rectangle(fe->gc, &rect);
 626 }
 627
 628 static void do_draw_rect(frontend *fe, int x, int y, int w, int h)
 629 {
 630     gdk_draw_rectangle(fe->pixmap, fe->gc, 1, x, y, w, h);
 631 }
 632
 633 static void do_draw_line(frontend *fe, int x1, int y1, int x2, int y2)
 634 {
 635     gdk_draw_line(fe->pixmap, fe->gc, x1, y1, x2, y2);
 636 }
 637
 638 static void do_draw_thick_line(frontend *fe, float thickness,
 639                                float x1, float y1, float x2, float y2)
 640 {
 641     GdkGCValues save;
 642
 643     gdk_gc_get_values(fe->gc, &save);
 644     gdk_gc_set_line_attributes(fe->gc,
 645                                thickness,
 646                                GDK_LINE_SOLID,
 647                                GDK_CAP_BUTT,
 648                                GDK_JOIN_BEVEL);
 649     gdk_draw_line(fe->pixmap, fe->gc, x1, y1, x2, y2);
 650     gdk_gc_set_line_attributes(fe->gc,
 651                                save.line_width,
 652                                save.line_style,
 653                                save.cap_style,
 654                                save.join_style);
 655 }
 656
 657 static void do_draw_poly(frontend *fe, int *coords, int npoints,
 658                          int fillcolour, int outlinecolour)
 659 {
 660     GdkPoint *points = snewn(npoints, GdkPoint);
 661     int i;
 662
 663     for (i = 0; i < npoints; i++) {
 664         points[i].x = coords[i*2];
 665         points[i].y = coords[i*2+1];
 666     }
 667
 668     if (fillcolour >= 0) {
 669         set_colour(fe, fillcolour);
 670         gdk_draw_polygon(fe->pixmap, fe->gc, TRUE, points, npoints);
 671     }
 672     assert(outlinecolour >= 0);
 673     set_colour(fe, outlinecolour);
 674
 675     /*
 676      * In principle we ought to be able to use gdk_draw_polygon for
 677      * the outline as well. In fact, it turns out to interact badly
 678      * with a clipping region, for no terribly obvious reason, so I
 679      * draw the outline as a sequence of lines instead.
 680      */
 681     for (i = 0; i < npoints; i++)
 682         gdk_draw_line(fe->pixmap, fe->gc,
 683                       points[i].x, points[i].y,
 684                       points[(i+1)%npoints].x, points[(i+1)%npoints].y);
 685
 686     sfree(points);
 687 }
 688
 689 static void do_draw_circle(frontend *fe, int cx, int cy, int radius,
 690                            int fillcolour, int outlinecolour)
 691 {
 692     if (fillcolour >= 0) {
 693         set_colour(fe, fillcolour);
 694         gdk_draw_arc(fe->pixmap, fe->gc, TRUE,
 695                      cx - radius, cy - radius,
 696                      2 * radius, 2 * radius, 0, 360 * 64);
 697     }
 698
 699     assert(outlinecolour >= 0);
 700     set_colour(fe, outlinecolour);
 701     gdk_draw_arc(fe->pixmap, fe->gc, FALSE,
 702                  cx - radius, cy - radius,
 703                  2 * radius, 2 * radius, 0, 360 * 64);
 704 }
 705
 706 static void setup_blitter(blitter *bl, int w, int h)
 707 {
 708     /*
 709      * We can't create the pixmap right now, because fe->window
 710      * might not yet exist. So we just cache w and h and create it
 711      * during the firs call to blitter_save.
 712      */
 713     bl->pixmap = NULL;
 714 }
 715
 716 static void teardown_blitter(blitter *bl)
 717 {
 718     if (bl->pixmap)
 719         gdk_pixmap_unref(bl->pixmap);
 720 }
 721
 722 static void do_blitter_save(frontend *fe, blitter *bl, int x, int y)
 723 {
 724     if (!bl->pixmap)
 725         bl->pixmap = gdk_pixmap_new(fe->area->window, bl->w, bl->h, -1);
 726     gdk_draw_pixmap(bl->pixmap,
 727                     fe->area->style->fg_gc[GTK_WIDGET_STATE(fe->area)],
 728                     fe->pixmap,
 729                     x, y, 0, 0, bl->w, bl->h);
 730 }
 731
 732 static void do_blitter_load(frontend *fe, blitter *bl, int x, int y)
 733 {
 734     assert(bl->pixmap);
 735     gdk_draw_pixmap(fe->pixmap,
 736                     fe->area->style->fg_gc[GTK_WIDGET_STATE(fe->area)],
 737                     bl->pixmap,
 738                     0, 0, x, y, bl->w, bl->h);
 739 }
 740
 741 static void clear_backing_store(frontend *fe)
 742 {
 743     fe->pixmap = NULL;
 744 }
 745
 746 static void setup_backing_store(frontend *fe)
 747 {
 748     GdkGC *gc;
 749
 750     fe->pixmap = gdk_pixmap_new(fe->area->window, fe->pw, fe->ph, -1);
 751
 752     gc = gdk_gc_new(fe->area->window);
 753     gdk_gc_set_foreground(gc, &fe->colours[0]);
 754     gdk_draw_rectangle(fe->pixmap, gc, 1, 0, 0, fe->pw, fe->ph);
 755     gdk_draw_rectangle(fe->area->window, gc, 1, 0, 0, fe->w, fe->h);
 756     gdk_gc_unref(gc);
 757 }
 758
 759 static int backing_store_ok(frontend *fe)
 760 {
 761     return (!!fe->pixmap);
 762 }
 763
 764 static void teardown_backing_store(frontend *fe)
 765 {
 766     gdk_pixmap_unref(fe->pixmap);
 767     fe->pixmap = NULL;
 768 }
 769
 770 #endif
 771
 772 #ifndef USE_CAIRO_WITHOUT_PIXMAP
 773 static void repaint_rectangle(frontend *fe, GtkWidget *widget,
 774                               int x, int y, int w, int h)
 775 {
 776     GdkGC *gc = gdk_gc_new(gtk_widget_get_window(widget));
 777 #ifdef USE_CAIRO
 778     gdk_gc_set_foreground(gc, &fe->background);
 779 #else
 780     gdk_gc_set_foreground(gc, &fe->colours[fe->backgroundindex]);
 781 #endif
 782     if (x < fe->ox) {
 783         gdk_draw_rectangle(gtk_widget_get_window(widget), gc,
 784                            TRUE, x, y, fe->ox - x, h);
 785         w -= (fe->ox - x);
 786         x = fe->ox;
 787     }
 788     if (y < fe->oy) {
 789         gdk_draw_rectangle(gtk_widget_get_window(widget), gc,
 790                            TRUE, x, y, w, fe->oy - y);
 791         h -= (fe->oy - y);
 792         y = fe->oy;
 793     }
 794     if (w > fe->pw) {
 795         gdk_draw_rectangle(gtk_widget_get_window(widget), gc,
 796                            TRUE, x + fe->pw, y, w - fe->pw, h);
 797         w = fe->pw;
 798     }
 799     if (h > fe->ph) {
 800         gdk_draw_rectangle(gtk_widget_get_window(widget), gc,
 801                            TRUE, x, y + fe->ph, w, h - fe->ph);
 802         h = fe->ph;
 803     }
 804     gdk_draw_pixmap(gtk_widget_get_window(widget), gc, fe->pixmap,
 805                     x - fe->ox, y - fe->oy, x, y, w, h);
 806     gdk_gc_unref(gc);
 807 }
 808 #endif
 809
 810 /* ----------------------------------------------------------------------
 811  * Pango font functions.
 812  */
 813
 814 #ifdef USE_PANGO
 815
 816 static void add_font(frontend *fe, int index, int fonttype, int fontsize)
 817 {
 818     /*
 819      * Use Pango to find the closest match to the requested
 820      * font.
 821      */
 822     PangoFontDescription *fd;
 823
 824     fd = pango_font_description_new();
 825     /* `Monospace' and `Sans' are meta-families guaranteed to exist */
 826     pango_font_description_set_family(fd, fonttype == FONT_FIXED ?
 827                                       "Monospace" : "Sans");
 828     pango_font_description_set_weight(fd, PANGO_WEIGHT_BOLD);
 829     /*
 830      * I found some online Pango documentation which
 831      * described a function called
 832      * pango_font_description_set_absolute_size(), which is
 833      * _exactly_ what I want here. Unfortunately, none of
 834      * my local Pango installations have it (presumably
 835      * they're too old), so I'm going to have to hack round
 836      * it by figuring out the point size myself. This
 837      * limits me to X and probably also breaks in later
 838      * Pango installations, so ideally I should add another
 839      * CHECK_VERSION type ifdef and use set_absolute_size
 840      * where available. All very annoying.
 841      */
 842 #ifdef HAVE_SENSIBLE_ABSOLUTE_SIZE_FUNCTION
 843     pango_font_description_set_absolute_size(fd, PANGO_SCALE*fontsize);
 844 #else
 845     {
 846         Display *d = GDK_DISPLAY();
 847         int s = DefaultScreen(d);
 848         double resolution =
 849             (PANGO_SCALE * 72.27 / 25.4) *
 850             ((double) DisplayWidthMM(d, s) / DisplayWidth (d, s));
 851         pango_font_description_set_size(fd, resolution * fontsize);
 852     }
 853 #endif
 854     fe->fonts[index].desc = fd;
 855 }
 856
 857 static void align_and_draw_text(frontend *fe,
 858                                 int index, int align, int x, int y,
 859                                 const char *text)
 860 {
 861     PangoLayout *layout;
 862     PangoRectangle rect;
 863
 864     layout = make_pango_layout(fe);
 865
 866     /*
 867      * Create a layout.
 868      */
 869     pango_layout_set_font_description(layout, fe->fonts[index].desc);
 870     pango_layout_set_text(layout, text, strlen(text));
 871     pango_layout_get_pixel_extents(layout, NULL, &rect);
 872
 873     if (align & ALIGN_VCENTRE)
 874         rect.y -= rect.height / 2;
 875     else
 876         rect.y -= rect.height;
 877
 878     if (align & ALIGN_HCENTRE)
 879         rect.x -= rect.width / 2;
 880     else if (align & ALIGN_HRIGHT)
 881         rect.x -= rect.width;
 882
 883     draw_pango_layout(fe, layout, rect.x + x, rect.y + y);
 884
 885     g_object_unref(layout);
 886 }
 887
 888 #endif
 889
 890 /* ----------------------------------------------------------------------
 891  * Old-fashioned font functions.
 892  */
 893
 894 #ifndef USE_PANGO
 895
 896 static void add_font(int index, int fonttype, int fontsize)
 897 {
 898     /*
 899      * In GTK 1.2, I don't know of any plausible way to
 900      * pick a suitable font, so I'm just going to be
 901      * tedious.
 902      */
 903     fe->fonts[i].font = gdk_font_load(fonttype == FONT_FIXED ?
 904                                       "fixed" : "variable");
 905 }
 906
 907 static void align_and_draw_text(int index, int align, int x, int y,
 908                                 const char *text)
 909 {
 910     int lb, rb, wid, asc, desc;
 911
 912     /*
 913      * Measure vertical string extents with respect to the same
 914      * string always...
 915      */
 916     gdk_string_extents(fe->fonts[i].font,
 917                        "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
 918                        &lb, &rb, &wid, &asc, &desc);
 919     if (align & ALIGN_VCENTRE)
 920         y += asc - (asc+desc)/2;
 921     else
 922         y += asc;
 923
 924     /*
 925      * ... but horizontal extents with respect to the provided
 926      * string. This means that multiple pieces of text centred
 927      * on the same y-coordinate don't have different baselines.
 928      */
 929     gdk_string_extents(fe->fonts[i].font, text,
 930                        &lb, &rb, &wid, &asc, &desc);
 931
 932     if (align & ALIGN_HCENTRE)
 933         x -= wid / 2;
 934     else if (align & ALIGN_HRIGHT)
 935         x -= wid;
 936
 937     /*
 938      * Actually draw the text.
 939      */
 940     gdk_draw_string(fe->pixmap, fe->fonts[i].font, fe->gc, x, y, text);
 941 }
 942
 943 #endif
 944
 945 /* ----------------------------------------------------------------------
 946  * The exported drawing functions.
 947  */
 948
 949 void gtk_start_draw(void *handle)
 950 {
 951     frontend *fe = (frontend *)handle;
 952     fe->bbox_l = fe->w;
 953     fe->bbox_r = 0;
 954     fe->bbox_u = fe->h;
 955     fe->bbox_d = 0;
 956     setup_drawing(fe);
 957 }
 958
 959 void gtk_clip(void *handle, int x, int y, int w, int h)
 960 {
 961     frontend *fe = (frontend *)handle;
 962     do_clip(fe, x, y, w, h);
 963 }
 964
 965 void gtk_unclip(void *handle)
 966 {
 967     frontend *fe = (frontend *)handle;
 968     do_unclip(fe);
 969 }
 970
 971 void gtk_draw_text(void *handle, int x, int y, int fonttype, int fontsize,
 972                    int align, int colour, char *text)
 973 {
 974     frontend *fe = (frontend *)handle;
 975     int i;
 976
 977     /*
 978      * Find or create the font.
 979      */
 980     for (i = 0; i < fe->nfonts; i++)
 981         if (fe->fonts[i].type == fonttype && fe->fonts[i].size == fontsize)
 982             break;
 983
 984     if (i == fe->nfonts) {
 985         if (fe->fontsize <= fe->nfonts) {
 986             fe->fontsize = fe->nfonts + 10;
 987             fe->fonts = sresize(fe->fonts, fe->fontsize, struct font);
 988         }
 989
 990         fe->nfonts++;
 991
 992         fe->fonts[i].type = fonttype;
 993         fe->fonts[i].size = fontsize;
 994         add_font(fe, i, fonttype, fontsize);
 995     }
 996
 997     /*
 998      * Do the job.
 999      */
1000     set_colour(fe, colour);
1001     align_and_draw_text(fe, i, align, x, y, text);
1002 }
1003
1004 void gtk_draw_rect(void *handle, int x, int y, int w, int h, int colour)
1005 {
1006     frontend *fe = (frontend *)handle;
1007     set_colour(fe, colour);
1008     do_draw_rect(fe, x, y, w, h);
1009 }
1010
1011 void gtk_draw_line(void *handle, int x1, int y1, int x2, int y2, int colour)
1012 {
1013     frontend *fe = (frontend *)handle;
1014     set_colour(fe, colour);
1015     do_draw_line(fe, x1, y1, x2, y2);
1016 }
1017
1018 void gtk_draw_thick_line(void *handle, float thickness,
1019                          float x1, float y1, float x2, float y2, int colour)
1020 {
1021     frontend *fe = (frontend *)handle;
1022     set_colour(fe, colour);
1023     do_draw_thick_line(fe, thickness, x1, y1, x2, y2);
1024 }
1025
1026 void gtk_draw_poly(void *handle, int *coords, int npoints,
1027                    int fillcolour, int outlinecolour)
1028 {
1029     frontend *fe = (frontend *)handle;
1030     do_draw_poly(fe, coords, npoints, fillcolour, outlinecolour);
1031 }
1032
1033 void gtk_draw_circle(void *handle, int cx, int cy, int radius,
1034                      int fillcolour, int outlinecolour)
1035 {
1036     frontend *fe = (frontend *)handle;
1037     do_draw_circle(fe, cx, cy, radius, fillcolour, outlinecolour);
1038 }
1039
1040 blitter *gtk_blitter_new(void *handle, int w, int h)
1041 {
1042     blitter *bl = snew(blitter);
1043     setup_blitter(bl, w, h);
1044     bl->w = w;
1045     bl->h = h;
1046     return bl;
1047 }
1048
1049 void gtk_blitter_free(void *handle, blitter *bl)
1050 {
1051     teardown_blitter(bl);
1052     sfree(bl);
1053 }
1054
1055 void gtk_blitter_save(void *handle, blitter *bl, int x, int y)
1056 {
1057     frontend *fe = (frontend *)handle;
1058     do_blitter_save(fe, bl, x, y);
1059     bl->x = x;
1060     bl->y = y;
1061 }
1062
1063 void gtk_blitter_load(void *handle, blitter *bl, int x, int y)
1064 {
1065     frontend *fe = (frontend *)handle;
1066     if (x == BLITTER_FROMSAVED && y == BLITTER_FROMSAVED) {
1067         x = bl->x;
1068         y = bl->y;
1069     }
1070     do_blitter_load(fe, bl, x, y);
1071 }
1072
1073 void gtk_draw_update(void *handle, int x, int y, int w, int h)
1074 {
1075     frontend *fe = (frontend *)handle;
1076     if (fe->bbox_l > x  ) fe->bbox_l = x  ;
1077     if (fe->bbox_r < x+w) fe->bbox_r = x+w;
1078     if (fe->bbox_u > y  ) fe->bbox_u = y  ;
1079     if (fe->bbox_d < y+h) fe->bbox_d = y+h;
1080 }
1081
1082 void gtk_end_draw(void *handle)
1083 {
1084     frontend *fe = (frontend *)handle;
1085
1086     teardown_drawing(fe);
1087
1088     if (fe->bbox_l < fe->bbox_r && fe->bbox_u < fe->bbox_d) {
1089 #ifdef USE_CAIRO_WITHOUT_PIXMAP
1090         gtk_widget_queue_draw_area(fe->area,
1091                                    fe->bbox_l - 1 + fe->ox,
1092                                    fe->bbox_u - 1 + fe->oy,
1093                                    fe->bbox_r - fe->bbox_l + 2,
1094                                    fe->bbox_d - fe->bbox_u + 2);
1095 #else
1096         repaint_rectangle(fe, fe->area,
1097                           fe->bbox_l - 1 + fe->ox,
1098                           fe->bbox_u - 1 + fe->oy,
1099                           fe->bbox_r - fe->bbox_l + 2,
1100                           fe->bbox_d - fe->bbox_u + 2);
1101 #endif
1102     }
1103 }
1104
1105 #ifdef USE_PANGO
1106 char *gtk_text_fallback(void *handle, const char *const *strings, int nstrings)
1107 {
1108     /*
1109      * We assume Pango can cope with any UTF-8 likely to be emitted
1110      * by a puzzle.
1111      */
1112     return dupstr(strings[0]);
1113 }
1114 #endif
1115
1116 const struct drawing_api gtk_drawing = {
1117     gtk_draw_text,
1118     gtk_draw_rect,
1119     gtk_draw_line,
1120     gtk_draw_poly,
1121     gtk_draw_circle,
1122     gtk_draw_update,
1123     gtk_clip,
1124     gtk_unclip,
1125     gtk_start_draw,
1126     gtk_end_draw,
1127     gtk_status_bar,
1128     gtk_blitter_new,
1129     gtk_blitter_free,
1130     gtk_blitter_save,
1131     gtk_blitter_load,
1132     NULL, NULL, NULL, NULL, NULL, NULL, /* {begin,end}_{doc,page,puzzle} */
1133     NULL, NULL,                        /* line_width, line_dotted */
1134 #ifdef USE_PANGO
1135     gtk_text_fallback,
1136 #else
1137     NULL,
1138 #endif
1139 #ifdef NO_THICK_LINE
1140     NULL,
1141 #else
1142     gtk_draw_thick_line,
1143 #endif
1144 };
1145
1146 static void destroy(GtkWidget *widget, gpointer data)
1147 {
1148     frontend *fe = (frontend *)data;
1149     deactivate_timer(fe);
1150     midend_free(fe->me);
1151     gtk_main_quit();
1152 }
1153
1154 static gint key_event(GtkWidget *widget, GdkEventKey *event, gpointer data)
1155 {
1156     frontend *fe = (frontend *)data;
1157     int keyval;
1158     int shift = (event->state & GDK_SHIFT_MASK) ? MOD_SHFT : 0;
1159     int ctrl = (event->state & GDK_CONTROL_MASK) ? MOD_CTRL : 0;
1160
1161     if (!backing_store_ok(fe))
1162         return TRUE;
1163
1164 #if !GTK_CHECK_VERSION(2,0,0)
1165     /* Gtk 1.2 passes a key event to this function even if it's also
1166      * defined as an accelerator.
1167      * Gtk 2 doesn't do this, and this function appears not to exist there. */
1168     if (fe->accelgroup &&
1169         gtk_accel_group_get_entry(fe->accelgroup,
1170         event->keyval, event->state))
1171         return TRUE;
1172 #endif
1173
1174     /* Handle mnemonics. */
1175     if (gtk_window_activate_key(GTK_WINDOW(fe->window), event))
1176         return TRUE;
1177
1178     if (event->keyval == GDK_KEY_Up)
1179         keyval = shift | ctrl | CURSOR_UP;
1180     else if (event->keyval == GDK_KEY_KP_Up ||
1181              event->keyval == GDK_KEY_KP_8)
1182         keyval = MOD_NUM_KEYPAD | '8';
1183     else if (event->keyval == GDK_KEY_Down)
1184         keyval = shift | ctrl | CURSOR_DOWN;
1185     else if (event->keyval == GDK_KEY_KP_Down ||
1186              event->keyval == GDK_KEY_KP_2)
1187         keyval = MOD_NUM_KEYPAD | '2';
1188     else if (event->keyval == GDK_KEY_Left)
1189         keyval = shift | ctrl | CURSOR_LEFT;
1190     else if (event->keyval == GDK_KEY_KP_Left ||
1191              event->keyval == GDK_KEY_KP_4)
1192         keyval = MOD_NUM_KEYPAD | '4';
1193     else if (event->keyval == GDK_KEY_Right)
1194         keyval = shift | ctrl | CURSOR_RIGHT;
1195     else if (event->keyval == GDK_KEY_KP_Right ||
1196              event->keyval == GDK_KEY_KP_6)
1197         keyval = MOD_NUM_KEYPAD | '6';
1198     else if (event->keyval == GDK_KEY_KP_Home ||
1199              event->keyval == GDK_KEY_KP_7)
1200         keyval = MOD_NUM_KEYPAD | '7';
1201     else if (event->keyval == GDK_KEY_KP_End ||
1202              event->keyval == GDK_KEY_KP_1)
1203         keyval = MOD_NUM_KEYPAD | '1';
1204     else if (event->keyval == GDK_KEY_KP_Page_Up ||
1205              event->keyval == GDK_KEY_KP_9)
1206         keyval = MOD_NUM_KEYPAD | '9';
1207     else if (event->keyval == GDK_KEY_KP_Page_Down ||
1208              event->keyval == GDK_KEY_KP_3)
1209         keyval = MOD_NUM_KEYPAD | '3';
1210     else if (event->keyval == GDK_KEY_KP_Insert ||
1211              event->keyval == GDK_KEY_KP_0)
1212         keyval = MOD_NUM_KEYPAD | '0';
1213     else if (event->keyval == GDK_KEY_KP_Begin ||
1214              event->keyval == GDK_KEY_KP_5)
1215         keyval = MOD_NUM_KEYPAD | '5';
1216     else if (event->keyval == GDK_KEY_BackSpace ||
1217              event->keyval == GDK_KEY_Delete ||
1218              event->keyval == GDK_KEY_KP_Delete)
1219         keyval = '\177';
1220     else if (event->string[0] && !event->string[1])
1221         keyval = (unsigned char)event->string[0];
1222     else
1223         keyval = -1;
1224
1225     if (keyval >= 0 &&
1226         !midend_process_key(fe->me, 0, 0, keyval))
1227         gtk_widget_destroy(fe->window);
1228
1229     return TRUE;
1230 }
1231
1232 static gint button_event(GtkWidget *widget, GdkEventButton *event,
1233                          gpointer data)
1234 {
1235     frontend *fe = (frontend *)data;
1236     int button;
1237
1238     if (!backing_store_ok(fe))
1239         return TRUE;
1240
1241     if (event->type != GDK_BUTTON_PRESS && event->type != GDK_BUTTON_RELEASE)
1242         return TRUE;
1243
1244     if (event->button == 2 || (event->state & GDK_SHIFT_MASK))
1245         button = MIDDLE_BUTTON;
1246     else if (event->button == 3 || (event->state & GDK_MOD1_MASK))
1247         button = RIGHT_BUTTON;
1248     else if (event->button == 1)
1249         button = LEFT_BUTTON;
1250     else if (event->button == 8 && event->type == GDK_BUTTON_PRESS)
1251         button = 'u';
1252     else if (event->button == 9 && event->type == GDK_BUTTON_PRESS)
1253         button = 'r';
1254     else
1255         return FALSE;                  /* don't even know what button! */
1256
1257     if (event->type == GDK_BUTTON_RELEASE && button >= LEFT_BUTTON)
1258         button += LEFT_RELEASE - LEFT_BUTTON;
1259
1260     if (!midend_process_key(fe->me, event->x - fe->ox,
1261                             event->y - fe->oy, button))
1262         gtk_widget_destroy(fe->window);
1263
1264     return TRUE;
1265 }
1266
1267 static gint motion_event(GtkWidget *widget, GdkEventMotion *event,
1268                          gpointer data)
1269 {
1270     frontend *fe = (frontend *)data;
1271     int button;
1272
1273     if (!backing_store_ok(fe))
1274         return TRUE;
1275
1276     if (event->state & (GDK_BUTTON2_MASK | GDK_SHIFT_MASK))
1277         button = MIDDLE_DRAG;
1278     else if (event->state & GDK_BUTTON1_MASK)
1279         button = LEFT_DRAG;
1280     else if (event->state & GDK_BUTTON3_MASK)
1281         button = RIGHT_DRAG;
1282     else
1283         return FALSE;                  /* don't even know what button! */
1284
1285     if (!midend_process_key(fe->me, event->x - fe->ox,
1286                             event->y - fe->oy, button))
1287         gtk_widget_destroy(fe->window);
1288 #if GTK_CHECK_VERSION(2,12,0)
1289     gdk_event_request_motions(event);
1290 #else
1291     gdk_window_get_pointer(gtk_widget_get_window(widget), NULL, NULL, NULL);
1292 #endif
1293
1294     return TRUE;
1295 }
1296
1297 #if GTK_CHECK_VERSION(3,0,0)
1298 static gint draw_area(GtkWidget *widget, cairo_t *cr, gpointer data)
1299 {
1300     frontend *fe = (frontend *)data;
1301     GdkRectangle dirtyrect;
1302
1303     gdk_cairo_get_clip_rectangle(cr, &dirtyrect);
1304     cairo_set_source_surface(cr, fe->image, fe->ox, fe->oy);
1305     cairo_rectangle(cr, dirtyrect.x, dirtyrect.y,
1306                     dirtyrect.width, dirtyrect.height);
1307     cairo_fill(cr);
1308
1309     return TRUE;
1310 }
1311 #else
1312 static gint expose_area(GtkWidget *widget, GdkEventExpose *event,
1313                         gpointer data)
1314 {
1315     frontend *fe = (frontend *)data;
1316
1317     if (backing_store_ok(fe)) {
1318 #ifdef USE_CAIRO_WITHOUT_PIXMAP
1319         cairo_t *cr = gdk_cairo_create(gtk_widget_get_window(widget));
1320         cairo_set_source_surface(cr, fe->image, fe->ox, fe->oy);
1321         cairo_rectangle(cr, event->area.x, event->area.y,
1322                         event->area.width, event->area.height);
1323         cairo_fill(cr);
1324         cairo_destroy(cr);
1325 #else
1326         repaint_rectangle(fe, widget,
1327                           event->area.x, event->area.y,
1328                           event->area.width, event->area.height);
1329 #endif
1330     }
1331     return TRUE;
1332 }
1333 #endif
1334
1335 static gint map_window(GtkWidget *widget, GdkEvent *event,
1336                        gpointer data)
1337 {
1338     frontend *fe = (frontend *)data;
1339
1340     /*
1341      * Apparently we need to do this because otherwise the status
1342      * bar will fail to update immediately. Annoying, but there we
1343      * go.
1344      */
1345     gtk_widget_queue_draw(fe->window);
1346
1347     return TRUE;
1348 }
1349
1350 static gint configure_area(GtkWidget *widget,
1351                            GdkEventConfigure *event, gpointer data)
1352 {
1353     frontend *fe = (frontend *)data;
1354     int x, y;
1355     int oldw = fe->w, oldpw = fe->pw, oldh = fe->h, oldph = fe->ph;
1356
1357     x = event->width;
1358     y = event->height;
1359     fe->w = x;
1360     fe->h = y;
1361     midend_size(fe->me, &x, &y, TRUE);
1362     fe->pw = x;
1363     fe->ph = y;
1364     fe->ox = (fe->w - fe->pw) / 2;
1365     fe->oy = (fe->h - fe->ph) / 2;
1366
1367     if (oldw != fe->w || oldpw != fe->pw ||
1368         oldh != fe->h || oldph != fe->ph || !backing_store_ok(fe)) {
1369         if (backing_store_ok(fe))
1370             teardown_backing_store(fe);
1371         setup_backing_store(fe);
1372     }
1373
1374     midend_force_redraw(fe->me);
1375
1376     return TRUE;
1377 }
1378
1379 static gint timer_func(gpointer data)
1380 {
1381     frontend *fe = (frontend *)data;
1382
1383     if (fe->timer_active) {
1384         struct timeval now;
1385         float elapsed;
1386         gettimeofday(&now, NULL);
1387         elapsed = ((now.tv_usec - fe->last_time.tv_usec) * 0.000001F +
1388                    (now.tv_sec - fe->last_time.tv_sec));
1389         midend_timer(fe->me, elapsed);  /* may clear timer_active */
1390         fe->last_time = now;
1391     }
1392
1393     return fe->timer_active;
1394 }
1395
1396 void deactivate_timer(frontend *fe)
1397 {
1398     if (!fe)
1399         return;                        /* can happen due to --generate */
1400     if (fe->timer_active)
1401         g_source_remove(fe->timer_id);
1402     fe->timer_active = FALSE;
1403 }
1404
1405 void activate_timer(frontend *fe)
1406 {
1407     if (!fe)
1408         return;                        /* can happen due to --generate */
1409     if (!fe->timer_active) {
1410         fe->timer_id = g_timeout_add(20, timer_func, fe);
1411         gettimeofday(&fe->last_time, NULL);
1412     }
1413     fe->timer_active = TRUE;
1414 }
1415
1416 static void window_destroy(GtkWidget *widget, gpointer data)
1417 {
1418     gtk_main_quit();
1419 }
1420
1421 static int win_key_press(GtkWidget *widget, GdkEventKey *event, gpointer data)
1422 {
1423     GObject *cancelbutton = G_OBJECT(data);
1424
1425     /*
1426      * `Escape' effectively clicks the cancel button
1427      */
1428     if (event->keyval == GDK_KEY_Escape) {
1429         g_signal_emit_by_name(cancelbutton, "clicked");
1430         return TRUE;
1431     }
1432
1433     return FALSE;
1434 }
1435
1436 enum { MB_OK, MB_YESNO };
1437
1438 static void align_label(GtkLabel *label, double x, double y)
1439 {
1440 #if GTK_CHECK_VERSION(3,16,0)
1441     gtk_label_set_xalign(label, x);
1442     gtk_label_set_yalign(label, y);
1443 #elif GTK_CHECK_VERSION(3,14,0)
1444     gtk_widget_set_halign(GTK_WIDGET(label),
1445                           x == 0 ? GTK_ALIGN_START :
1446                           x == 1 ? GTK_ALIGN_END : GTK_ALIGN_CENTER);
1447     gtk_widget_set_valign(GTK_WIDGET(label),
1448                           y == 0 ? GTK_ALIGN_START :
1449                           y == 1 ? GTK_ALIGN_END : GTK_ALIGN_CENTER);
1450 #else
1451     gtk_misc_set_alignment(GTK_MISC(label), x, y);
1452 #endif
1453 }
1454
1455 #if GTK_CHECK_VERSION(3,0,0)
1456 int message_box(GtkWidget *parent, char *title, char *msg, int centre,
1457                 int type)
1458 {
1459     GtkWidget *window;
1460     gint ret;
1461
1462     window = gtk_message_dialog_new
1463         (GTK_WINDOW(parent),
1464          (GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT),
1465          (type == MB_OK ? GTK_MESSAGE_INFO : GTK_MESSAGE_QUESTION),
1466          (type == MB_OK ? GTK_BUTTONS_OK   : GTK_BUTTONS_YES_NO),
1467          "%s", msg);
1468     gtk_window_set_title(GTK_WINDOW(window), title);
1469     ret = gtk_dialog_run(GTK_DIALOG(window));
1470     gtk_widget_destroy(window);
1471     return (type == MB_OK ? TRUE : (ret == GTK_RESPONSE_YES));
1472 }
1473 #else /* GTK_CHECK_VERSION(3,0,0) */
1474 static void msgbox_button_clicked(GtkButton *button, gpointer data)
1475 {
1476     GtkWidget *window = GTK_WIDGET(data);
1477     int v, *ip;
1478
1479     ip = (int *)g_object_get_data(G_OBJECT(window), "user-data");
1480     v = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(button), "user-data"));
1481     *ip = v;
1482
1483     gtk_widget_destroy(GTK_WIDGET(data));
1484 }
1485
1486 int message_box(GtkWidget *parent, char *title, char *msg, int centre,
1487                 int type)
1488 {
1489     GtkWidget *window, *hbox, *text, *button;
1490     char *titles;
1491     int i, def, cancel;
1492
1493     window = gtk_dialog_new();
1494     text = gtk_label_new(msg);
1495     align_label(GTK_LABEL(text), 0.0, 0.0);
1496     hbox = gtk_hbox_new(FALSE, 0);
1497     gtk_box_pack_start(GTK_BOX(hbox), text, FALSE, FALSE, 20);
1498     gtk_box_pack_start
1499         (GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(window))),
1500          hbox, FALSE, FALSE, 20);
1501     gtk_widget_show(text);
1502     gtk_widget_show(hbox);
1503     gtk_window_set_title(GTK_WINDOW(window), title);
1504     gtk_label_set_line_wrap(GTK_LABEL(text), TRUE);
1505
1506     if (type == MB_OK) {
1507         titles = LABEL_OK "\0";
1508         def = cancel = 0;
1509     } else {
1510         assert(type == MB_YESNO);
1511         titles = LABEL_NO "\0" LABEL_YES "\0";
1512         def = 1;
1513         cancel = 0;
1514     }
1515     i = 0;
1516
1517     while (*titles) {
1518         button = gtk_button_new_with_our_label(titles);
1519         gtk_box_pack_end
1520             (GTK_BOX(gtk_dialog_get_action_area(GTK_DIALOG(window))),
1521              button, FALSE, FALSE, 0);
1522         gtk_widget_show(button);
1523         if (i == def) {
1524             gtk_widget_set_can_default(button, TRUE);
1525             gtk_window_set_default(GTK_WINDOW(window), button);
1526         }
1527         if (i == cancel) {
1528             g_signal_connect(G_OBJECT(window), "key_press_event",
1529                              G_CALLBACK(win_key_press), button);
1530         }
1531         g_signal_connect(G_OBJECT(button), "clicked",
1532                          G_CALLBACK(msgbox_button_clicked), window);
1533         g_object_set_data(G_OBJECT(button), "user-data",
1534                           GINT_TO_POINTER(i));
1535         titles += strlen(titles)+1;
1536         i++;
1537     }
1538     g_object_set_data(G_OBJECT(window), "user-data", &i);
1539     g_signal_connect(G_OBJECT(window), "destroy",
1540                      G_CALLBACK(window_destroy), NULL);
1541     gtk_window_set_modal(GTK_WINDOW(window), TRUE);
1542     gtk_window_set_transient_for(GTK_WINDOW(window), GTK_WINDOW(parent));
1543     /* set_transient_window_pos(parent, window); */
1544     gtk_widget_show(window);
1545     i = -1;
1546     gtk_main();
1547     return (type == MB_YESNO ? i == 1 : TRUE);
1548 }
1549 #endif /* GTK_CHECK_VERSION(3,0,0) */
1550
1551 void error_box(GtkWidget *parent, char *msg)
1552 {
1553     message_box(parent, "Error", msg, FALSE, MB_OK);
1554 }
1555
1556 static void config_ok_button_clicked(GtkButton *button, gpointer data)
1557 {
1558     frontend *fe = (frontend *)data;
1559     char *err;
1560
1561     err = midend_set_config(fe->me, fe->cfg_which, fe->cfg);
1562
1563     if (err)
1564         error_box(fe->cfgbox, err);
1565     else {
1566         fe->cfgret = TRUE;
1567         gtk_widget_destroy(fe->cfgbox);
1568         changed_preset(fe);
1569     }
1570 }
1571
1572 static void config_cancel_button_clicked(GtkButton *button, gpointer data)
1573 {
1574     frontend *fe = (frontend *)data;
1575
1576     gtk_widget_destroy(fe->cfgbox);
1577 }
1578
1579 static int editbox_key(GtkWidget *widget, GdkEventKey *event, gpointer data)
1580 {
1581     /*
1582      * GtkEntry has a nasty habit of eating the Return key, which
1583      * is unhelpful since it doesn't actually _do_ anything with it
1584      * (it calls gtk_widget_activate, but our edit boxes never need
1585      * activating). So I catch Return before GtkEntry sees it, and
1586      * pass it straight on to the parent widget. Effect: hitting
1587      * Return in an edit box will now activate the default button
1588      * in the dialog just like it will everywhere else.
1589      */
1590     if (event->keyval == GDK_KEY_Return &&
1591         gtk_widget_get_parent(widget) != NULL) {
1592         gint return_val;
1593         g_signal_stop_emission_by_name(G_OBJECT(widget), "key_press_event");
1594         g_signal_emit_by_name(G_OBJECT(gtk_widget_get_parent(widget)),
1595                               "key_press_event", event, &return_val);
1596         return return_val;
1597     }
1598     return FALSE;
1599 }
1600
1601 static void editbox_changed(GtkEditable *ed, gpointer data)
1602 {
1603     config_item *i = (config_item *)data;
1604
1605     sfree(i->sval);
1606     i->sval = dupstr(gtk_entry_get_text(GTK_ENTRY(ed)));
1607 }
1608
1609 static void button_toggled(GtkToggleButton *tb, gpointer data)
1610 {
1611     config_item *i = (config_item *)data;
1612
1613     i->ival = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(tb));
1614 }
1615
1616 static void droplist_sel(GtkComboBox *combo, gpointer data)
1617 {
1618     config_item *i = (config_item *)data;
1619
1620     i->ival = gtk_combo_box_get_active(combo);
1621 }
1622
1623 static int get_config(frontend *fe, int which)
1624 {
1625     GtkWidget *w, *table, *cancel;
1626     GtkBox *content_box, *button_box;
1627     char *title;
1628     config_item *i;
1629     int y;
1630
1631     fe->cfg = midend_get_config(fe->me, which, &title);
1632     fe->cfg_which = which;
1633     fe->cfgret = FALSE;
1634
1635 #if GTK_CHECK_VERSION(3,0,0)
1636     /* GtkDialog isn't quite flexible enough */
1637     fe->cfgbox = gtk_window_new(GTK_WINDOW_TOPLEVEL);
1638     content_box = GTK_BOX(gtk_vbox_new(FALSE, 8));
1639     g_object_set(G_OBJECT(content_box), "margin", 8, (const char *)NULL);
1640     gtk_widget_show(GTK_WIDGET(content_box));
1641     gtk_container_add(GTK_CONTAINER(fe->cfgbox), GTK_WIDGET(content_box));
1642     button_box = GTK_BOX(gtk_hbox_new(FALSE, 8));
1643     gtk_widget_show(GTK_WIDGET(button_box));
1644     gtk_box_pack_end(content_box, GTK_WIDGET(button_box), FALSE, FALSE, 0);
1645     {
1646         GtkWidget *sep = gtk_separator_new(GTK_ORIENTATION_HORIZONTAL);
1647         gtk_widget_show(sep);
1648         gtk_box_pack_end(content_box, sep, FALSE, FALSE, 0);
1649     }
1650 #else
1651     fe->cfgbox = gtk_dialog_new();
1652     content_box = GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(fe->cfgbox)));
1653     button_box = GTK_BOX(gtk_dialog_get_action_area(GTK_DIALOG(fe->cfgbox)));
1654 #endif
1655     gtk_window_set_title(GTK_WINDOW(fe->cfgbox), title);
1656     sfree(title);
1657
1658     w = gtk_button_new_with_our_label(LABEL_CANCEL);
1659     gtk_box_pack_end(button_box, w, FALSE, FALSE, 0);
1660     gtk_widget_show(w);
1661     g_signal_connect(G_OBJECT(w), "clicked",
1662                      G_CALLBACK(config_cancel_button_clicked), fe);
1663     cancel = w;
1664
1665     w = gtk_button_new_with_our_label(LABEL_OK);
1666     gtk_box_pack_end(button_box, w, FALSE, FALSE, 0);
1667     gtk_widget_show(w);
1668     gtk_widget_set_can_default(w, TRUE);
1669     gtk_window_set_default(GTK_WINDOW(fe->cfgbox), w);
1670     g_signal_connect(G_OBJECT(w), "clicked",
1671                      G_CALLBACK(config_ok_button_clicked), fe);
1672
1673 #if GTK_CHECK_VERSION(3,0,0)
1674     table = gtk_grid_new();
1675 #else
1676     table = gtk_table_new(1, 2, FALSE);
1677 #endif
1678     y = 0;
1679     gtk_box_pack_start(content_box, table, FALSE, FALSE, 0);
1680     gtk_widget_show(table);
1681
1682     for (i = fe->cfg; i->type != C_END; i++) {
1683 #if !GTK_CHECK_VERSION(3,0,0)
1684         gtk_table_resize(GTK_TABLE(table), y+1, 2);
1685 #endif
1686
1687         switch (i->type) {
1688           case C_STRING:
1689             /*
1690              * Edit box with a label beside it.
1691              */
1692
1693             w = gtk_label_new(i->name);
1694             align_label(GTK_LABEL(w), 0.0, 0.5);
1695 #if GTK_CHECK_VERSION(3,0,0)
1696             gtk_grid_attach(GTK_GRID(table), w, 0, y, 1, 1);
1697 #else
1698             gtk_table_attach(GTK_TABLE(table), w, 0, 1, y, y+1,
1699                              GTK_SHRINK | GTK_FILL,
1700                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1701                              3, 3);
1702 #endif
1703             gtk_widget_show(w);
1704
1705             w = gtk_entry_new();
1706 #if GTK_CHECK_VERSION(3,0,0)
1707             gtk_grid_attach(GTK_GRID(table), w, 1, y, 1, 1);
1708             g_object_set(G_OBJECT(w), "hexpand", TRUE, (const char *)NULL);
1709 #else
1710             gtk_table_attach(GTK_TABLE(table), w, 1, 2, y, y+1,
1711                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1712                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1713                              3, 3);
1714 #endif
1715             gtk_entry_set_text(GTK_ENTRY(w), i->sval);
1716             g_signal_connect(G_OBJECT(w), "changed",
1717                              G_CALLBACK(editbox_changed), i);
1718             g_signal_connect(G_OBJECT(w), "key_press_event",
1719                              G_CALLBACK(editbox_key), NULL);
1720             gtk_widget_show(w);
1721
1722             break;
1723
1724           case C_BOOLEAN:
1725             /*
1726              * Simple checkbox.
1727              */
1728             w = gtk_check_button_new_with_label(i->name);
1729             g_signal_connect(G_OBJECT(w), "toggled",
1730                              G_CALLBACK(button_toggled), i);
1731 #if GTK_CHECK_VERSION(3,0,0)
1732             gtk_grid_attach(GTK_GRID(table), w, 0, y, 2, 1);
1733             g_object_set(G_OBJECT(w), "hexpand", TRUE, (const char *)NULL);
1734 #else
1735             gtk_table_attach(GTK_TABLE(table), w, 0, 2, y, y+1,
1736                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1737                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1738                              3, 3);
1739 #endif
1740             gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(w), i->ival);
1741             gtk_widget_show(w);
1742             break;
1743
1744           case C_CHOICES:
1745             /*
1746              * Drop-down list (GtkComboBox).
1747              */
1748
1749             w = gtk_label_new(i->name);
1750             align_label(GTK_LABEL(w), 0.0, 0.5);
1751 #if GTK_CHECK_VERSION(3,0,0)
1752             gtk_grid_attach(GTK_GRID(table), w, 0, y, 1, 1);
1753 #else
1754             gtk_table_attach(GTK_TABLE(table), w, 0, 1, y, y+1,
1755                              GTK_SHRINK | GTK_FILL,
1756                              GTK_EXPAND | GTK_SHRINK | GTK_FILL ,
1757                              3, 3);
1758 #endif
1759             gtk_widget_show(w);
1760
1761             {
1762                 int c;
1763                 char *p, *q, *name;
1764                 GtkListStore *model;
1765                 GtkCellRenderer *cr;
1766                 GtkTreeIter iter;
1767
1768                 model = gtk_list_store_new(1, G_TYPE_STRING);
1769
1770                 c = *i->sval;
1771                 p = i->sval+1;
1772
1773                 while (*p) {
1774                     q = p;
1775                     while (*q && *q != c)
1776                         q++;
1777
1778                     name = snewn(q-p+1, char);
1779                     strncpy(name, p, q-p);
1780                     name[q-p] = '\0';
1781
1782                     if (*q) q++;       /* eat delimiter */
1783
1784                     gtk_list_store_append(model, &iter);
1785                     gtk_list_store_set(model, &iter, 0, name, -1);
1786
1787                     p = q;
1788                 }
1789
1790                 w = gtk_combo_box_new_with_model(GTK_TREE_MODEL(model));
1791
1792                 gtk_combo_box_set_active(GTK_COMBO_BOX(w), i->ival);
1793
1794                 cr = gtk_cell_renderer_text_new();
1795                 gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(w), cr, TRUE);
1796                 gtk_cell_layout_set_attributes(GTK_CELL_LAYOUT(w), cr,
1797                                                "text", 0, NULL);
1798
1799                 g_signal_connect(G_OBJECT(w), "changed",
1800                                  G_CALLBACK(droplist_sel), i);
1801             }
1802
1803 #if GTK_CHECK_VERSION(3,0,0)
1804             gtk_grid_attach(GTK_GRID(table), w, 1, y, 1, 1);
1805             g_object_set(G_OBJECT(w), "hexpand", TRUE, (const char *)NULL);
1806 #else
1807             gtk_table_attach(GTK_TABLE(table), w, 1, 2, y, y+1,
1808                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1809                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1810                              3, 3);
1811 #endif
1812             gtk_widget_show(w);
1813             break;
1814         }
1815
1816         y++;
1817     }
1818
1819     g_signal_connect(G_OBJECT(fe->cfgbox), "destroy",
1820                      G_CALLBACK(window_destroy), NULL);
1821     g_signal_connect(G_OBJECT(fe->cfgbox), "key_press_event",
1822                      G_CALLBACK(win_key_press), cancel);
1823     gtk_window_set_modal(GTK_WINDOW(fe->cfgbox), TRUE);
1824     gtk_window_set_transient_for(GTK_WINDOW(fe->cfgbox),
1825                                  GTK_WINDOW(fe->window));
1826     /* set_transient_window_pos(fe->window, fe->cfgbox); */
1827     gtk_widget_show(fe->cfgbox);
1828     gtk_main();
1829
1830     free_cfg(fe->cfg);
1831
1832     return fe->cfgret;
1833 }
1834
1835 static void menu_key_event(GtkMenuItem *menuitem, gpointer data)
1836 {
1837     frontend *fe = (frontend *)data;
1838     int key = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(menuitem),
1839                                                 "user-data"));
1840     if (!midend_process_key(fe->me, 0, 0, key))
1841         gtk_widget_destroy(fe->window);
1842 }
1843
1844 static void get_size(frontend *fe, int *px, int *py)
1845 {
1846     int x, y;
1847
1848     /*
1849      * Currently I don't want to make the GTK port scale large
1850      * puzzles to fit on the screen. This is because X does permit
1851      * extremely large windows and many window managers provide a
1852      * means of navigating round them, and the users I consulted
1853      * before deciding said that they'd rather have enormous puzzle
1854      * windows spanning multiple screen pages than have them
1855      * shrunk. I could change my mind later or introduce
1856      * configurability; this would be the place to do so, by
1857      * replacing the initial values of x and y with the screen
1858      * dimensions.
1859      */
1860     x = INT_MAX;
1861     y = INT_MAX;
1862     midend_size(fe->me, &x, &y, FALSE);
1863     *px = x;
1864     *py = y;
1865 }
1866
1867 #if !GTK_CHECK_VERSION(2,0,0)
1868 #define gtk_window_resize(win, x, y) \
1869         gdk_window_resize(GTK_WIDGET(win)->window, x, y)
1870 #endif
1871
1872 /*
1873  * Called when any other code in this file has changed the
1874  * selected game parameters.
1875  */
1876 static void changed_preset(frontend *fe)
1877 {
1878     int n = midend_which_preset(fe->me);
1879
1880     fe->preset_threaded = TRUE;
1881     if (n < 0 && fe->preset_custom) {
1882         gtk_check_menu_item_set_active(
1883             GTK_CHECK_MENU_ITEM(fe->preset_custom),
1884             TRUE);
1885     } else {
1886         GSList *gs = fe->preset_radio;
1887         int i = fe->n_preset_menu_items - 1 - n;
1888         if (fe->preset_custom)
1889             gs = gs->next;
1890         while (i && gs) {
1891             i--;
1892             gs = gs->next;
1893         }
1894         if (gs) {
1895             gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(gs->data),
1896                                            TRUE);
1897         } else for (gs = fe->preset_radio; gs; gs = gs->next) {
1898             gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(gs->data),
1899                                            FALSE);
1900         }
1901     }
1902     fe->preset_threaded = FALSE;
1903
1904     /*
1905      * Update the greying on the Copy menu option.
1906      */
1907     if (fe->copy_menu_item) {
1908         int enabled = midend_can_format_as_text_now(fe->me);
1909         gtk_widget_set_sensitive(fe->copy_menu_item, enabled);
1910     }
1911 }
1912
1913 #if !GTK_CHECK_VERSION(3,0,0)
1914 static gboolean not_size_allocated_yet(GtkWidget *w)
1915 {
1916     /*
1917      * This function tests whether a widget has not yet taken up space
1918      * on the screen which it will occupy in future. (Therefore, it
1919      * returns true only if the widget does exist but does not have a
1920      * size allocation. A null widget is already taking up all the
1921      * space it ever will.)
1922      */
1923     if (!w)
1924         return FALSE;        /* nonexistent widgets aren't a problem */
1925
1926 #if GTK_CHECK_VERSION(2,18,0)  /* skip if no gtk_widget_get_allocation */
1927     {
1928         GtkAllocation a;
1929         gtk_widget_get_allocation(w, &a);
1930         if (a.height == 0 || a.width == 0)
1931             return TRUE;       /* widget exists but has no size yet */
1932     }
1933 #endif
1934
1935     return FALSE;
1936 }
1937
1938 static void try_shrink_drawing_area(frontend *fe)
1939 {
1940     if (fe->drawing_area_shrink_pending &&
1941         (!fe->menubar_is_local || !not_size_allocated_yet(fe->menubar)) &&
1942         !not_size_allocated_yet(fe->statusbar)) {
1943         /*
1944          * In order to permit the user to resize the window smaller as
1945          * well as bigger, we call this function after the window size
1946          * has ended up where we want it. This shouldn't shrink the
1947          * window immediately; it just arranges that the next time the
1948          * user tries to shrink it, they can.
1949          *
1950          * However, at puzzle creation time, we defer the first of
1951          * these operations until after the menu bar and status bar
1952          * are actually visible. On Ubuntu 12.04 I've found that these
1953          * can take a while to be displayed, and that it's a mistake
1954          * to reduce the drawing area's size allocation before they've
1955          * turned up or else the drawing area makes room for them by
1956          * shrinking to less than the size we intended.
1957          */
1958         gtk_drawing_area_size(GTK_DRAWING_AREA(fe->area), 1, 1);
1959         fe->drawing_area_shrink_pending = FALSE;
1960     }
1961 }
1962 #endif /* !GTK_CHECK_VERSION(3,0,0) */
1963
1964 static gint configure_window(GtkWidget *widget,
1965                              GdkEventConfigure *event, gpointer data)
1966 {
1967 #if !GTK_CHECK_VERSION(3,0,0)
1968     /*
1969      * When the main puzzle window changes size, it might be because
1970      * the menu bar or status bar has turned up after starting off
1971      * absent, in which case we should have another go at enacting a
1972      * pending shrink of the drawing area.
1973      */
1974     frontend *fe = (frontend *)data;
1975     try_shrink_drawing_area(fe);
1976 #endif
1977     return FALSE;
1978 }
1979
1980 #if GTK_CHECK_VERSION(3,0,0)
1981 static int window_extra_height(frontend *fe)
1982 {
1983     int ret = 0;
1984     if (fe->menubar) {
1985         GtkRequisition req;
1986         gtk_widget_get_preferred_size(fe->menubar, &req, NULL);
1987         ret += req.height;
1988     }
1989     if (fe->statusbar) {
1990         GtkRequisition req;
1991         gtk_widget_get_preferred_size(fe->statusbar, &req, NULL);
1992         ret += req.height;
1993     }
1994     return ret;
1995 }
1996 #endif
1997
1998 static void resize_fe(frontend *fe)
1999 {
2000     int x, y;
2001
2002     get_size(fe, &x, &y);
2003
2004 #if GTK_CHECK_VERSION(3,0,0)
2005     gtk_window_resize(GTK_WINDOW(fe->window), x, y + window_extra_height(fe));
2006 #else
2007     fe->drawing_area_shrink_pending = FALSE;
2008     gtk_drawing_area_size(GTK_DRAWING_AREA(fe->area), x, y);
2009     {
2010         GtkRequisition req;
2011         gtk_widget_size_request(GTK_WIDGET(fe->window), &req);
2012         gtk_window_resize(GTK_WINDOW(fe->window), req.width, req.height);
2013     }
2014     fe->drawing_area_shrink_pending = TRUE;
2015     try_shrink_drawing_area(fe);
2016 #endif
2017 }
2018
2019 static void menu_preset_event(GtkMenuItem *menuitem, gpointer data)
2020 {
2021     frontend *fe = (frontend *)data;
2022     game_params *params =
2023         (game_params *)g_object_get_data(G_OBJECT(menuitem), "user-data");
2024
2025     if (fe->preset_threaded ||
2026         (GTK_IS_CHECK_MENU_ITEM(menuitem) &&
2027          !gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(menuitem))))
2028         return;
2029     midend_set_params(fe->me, params);
2030     midend_new_game(fe->me);
2031     changed_preset(fe);
2032     resize_fe(fe);
2033     midend_redraw(fe->me);
2034 }
2035
2036 GdkAtom compound_text_atom, utf8_string_atom;
2037 int paste_initialised = FALSE;
2038
2039 static void set_selection(frontend *fe, GdkAtom selection)
2040 {
2041     if (!paste_initialised) {
2042         compound_text_atom = gdk_atom_intern("COMPOUND_TEXT", FALSE);
2043         utf8_string_atom = gdk_atom_intern("UTF8_STRING", FALSE);
2044         paste_initialised = TRUE;
2045     }
2046
2047     /*
2048      * For this simple application we can safely assume that the
2049      * data passed to this function is pure ASCII, which means we
2050      * can return precisely the same stuff for types STRING,
2051      * COMPOUND_TEXT or UTF8_STRING.
2052      */
2053
2054     if (gtk_selection_owner_set(fe->area, selection, CurrentTime)) {
2055         gtk_selection_clear_targets(fe->area, selection);
2056         gtk_selection_add_target(fe->area, selection,
2057                                  GDK_SELECTION_TYPE_STRING, 1);
2058         gtk_selection_add_target(fe->area, selection, compound_text_atom, 1);
2059         gtk_selection_add_target(fe->area, selection, utf8_string_atom, 1);
2060     }
2061 }
2062
2063 void write_clip(frontend *fe, char *data)
2064 {
2065     if (fe->paste_data)
2066         sfree(fe->paste_data);
2067
2068     fe->paste_data = data;
2069     fe->paste_data_len = strlen(data);
2070
2071     set_selection(fe, GDK_SELECTION_PRIMARY);
2072     set_selection(fe, GDK_SELECTION_CLIPBOARD);
2073 }
2074
2075 void selection_get(GtkWidget *widget, GtkSelectionData *seldata,
2076                    guint info, guint time_stamp, gpointer data)
2077 {
2078     frontend *fe = (frontend *)data;
2079     gtk_selection_data_set(seldata, gtk_selection_data_get_target(seldata), 8,
2080                            fe->paste_data, fe->paste_data_len);
2081 }
2082
2083 gint selection_clear(GtkWidget *widget, GdkEventSelection *seldata,
2084                      gpointer data)
2085 {
2086     frontend *fe = (frontend *)data;
2087
2088     if (fe->paste_data)
2089         sfree(fe->paste_data);
2090     fe->paste_data = NULL;
2091     fe->paste_data_len = 0;
2092     return TRUE;
2093 }
2094
2095 static void menu_copy_event(GtkMenuItem *menuitem, gpointer data)
2096 {
2097     frontend *fe = (frontend *)data;
2098     char *text;
2099
2100     text = midend_text_format(fe->me);
2101
2102     if (text) {
2103         write_clip(fe, text);
2104     } else {
2105         gdk_beep();
2106     }
2107 }
2108
2109 #ifdef OLD_FILESEL
2110
2111 static void filesel_ok(GtkButton *button, gpointer data)
2112 {
2113     frontend *fe = (frontend *)data;
2114
2115     gpointer filesel = g_object_get_data(G_OBJECT(button), "user-data");
2116
2117     const char *name =
2118         gtk_file_selection_get_filename(GTK_FILE_SELECTION(filesel));
2119
2120     fe->filesel_name = dupstr(name);
2121 }
2122
2123 static char *file_selector(frontend *fe, char *title, int save)
2124 {
2125     GtkWidget *filesel =
2126         gtk_file_selection_new(title);
2127
2128     fe->filesel_name = NULL;
2129
2130     gtk_window_set_modal(GTK_WINDOW(filesel), TRUE);
2131     g_object_set_data
2132         (G_OBJECT(GTK_FILE_SELECTION(filesel)->ok_button), "user-data",
2133          (gpointer)filesel);
2134     g_signal_connect
2135         (G_OBJECT(GTK_FILE_SELECTION(filesel)->ok_button), "clicked",
2136          G_CALLBACK(filesel_ok), fe);
2137     g_signal_connect_swapped
2138         (G_OBJECT(GTK_FILE_SELECTION(filesel)->ok_button), "clicked",
2139          G_CALLBACK(gtk_widget_destroy), (gpointer)filesel);
2140     g_signal_connect_object
2141         (G_OBJECT(GTK_FILE_SELECTION(filesel)->cancel_button), "clicked",
2142          G_CALLBACK(gtk_widget_destroy), (gpointer)filesel);
2143     g_signal_connect(G_OBJECT(filesel), "destroy",
2144                      G_CALLBACK(window_destroy), NULL);
2145     gtk_widget_show(filesel);
2146     gtk_window_set_transient_for(GTK_WINDOW(filesel), GTK_WINDOW(fe->window));
2147     gtk_main();
2148
2149     return fe->filesel_name;
2150 }
2151
2152 #else
2153
2154 static char *file_selector(frontend *fe, char *title, int save)
2155 {
2156     char *filesel_name = NULL;
2157
2158     GtkWidget *filesel =
2159         gtk_file_chooser_dialog_new(title,
2160                                     GTK_WINDOW(fe->window),
2161                                     save ? GTK_FILE_CHOOSER_ACTION_SAVE :
2162                                     GTK_FILE_CHOOSER_ACTION_OPEN,
2163                                     LABEL_CANCEL, GTK_RESPONSE_CANCEL,
2164                                     save ? LABEL_SAVE : LABEL_OPEN,
2165                                     GTK_RESPONSE_ACCEPT,
2166                                     NULL);
2167
2168     if (gtk_dialog_run(GTK_DIALOG(filesel)) == GTK_RESPONSE_ACCEPT) {
2169         char *name = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(filesel));
2170         filesel_name = dupstr(name);
2171         g_free(name);
2172     }
2173
2174     gtk_widget_destroy(filesel);
2175
2176     return filesel_name;
2177 }
2178
2179 #endif
2180
2181 struct savefile_write_ctx {
2182     FILE *fp;
2183     int error;
2184 };
2185
2186 static void savefile_write(void *wctx, void *buf, int len)
2187 {
2188     struct savefile_write_ctx *ctx = (struct savefile_write_ctx *)wctx;
2189     if (fwrite(buf, 1, len, ctx->fp) < len)
2190         ctx->error = errno;
2191 }
2192
2193 static int savefile_read(void *wctx, void *buf, int len)
2194 {
2195     FILE *fp = (FILE *)wctx;
2196     int ret;
2197
2198     ret = fread(buf, 1, len, fp);
2199     return (ret == len);
2200 }
2201
2202 static void menu_save_event(GtkMenuItem *menuitem, gpointer data)
2203 {
2204     frontend *fe = (frontend *)data;
2205     char *name;
2206
2207     name = file_selector(fe, "Enter name of game file to save", TRUE);
2208
2209     if (name) {
2210         FILE *fp;
2211
2212         if ((fp = fopen(name, "r")) != NULL) {
2213             char buf[256 + FILENAME_MAX];
2214             fclose(fp);
2215             /* file exists */
2216
2217             sprintf(buf, "Are you sure you want to overwrite the"
2218                     " file \"%.*s\"?",
2219                     FILENAME_MAX, name);
2220             if (!message_box(fe->window, "Question", buf, TRUE, MB_YESNO))
2221                 goto free_and_return;
2222         }
2223
2224         fp = fopen(name, "w");
2225
2226         if (!fp) {
2227             error_box(fe->window, "Unable to open save file");
2228             goto free_and_return;
2229         }
2230
2231         {
2232             struct savefile_write_ctx ctx;
2233             ctx.fp = fp;
2234             ctx.error = 0;
2235             midend_serialise(fe->me, savefile_write, &ctx);
2236             fclose(fp);
2237             if (ctx.error) {
2238                 char boxmsg[512];
2239                 sprintf(boxmsg, "Error writing save file: %.400s",
2240                         strerror(errno));
2241                 error_box(fe->window, boxmsg);
2242                 goto free_and_return;
2243             }
2244         }
2245     free_and_return:
2246         sfree(name);
2247     }
2248 }
2249
2250 static void menu_load_event(GtkMenuItem *menuitem, gpointer data)
2251 {
2252     frontend *fe = (frontend *)data;
2253     char *name, *err;
2254
2255     name = file_selector(fe, "Enter name of saved game file to load", FALSE);
2256
2257     if (name) {
2258         FILE *fp = fopen(name, "r");
2259         sfree(name);
2260
2261         if (!fp) {
2262             error_box(fe->window, "Unable to open saved game file");
2263             return;
2264         }
2265
2266         err = midend_deserialise(fe->me, savefile_read, fp);
2267
2268         fclose(fp);
2269
2270         if (err) {
2271             error_box(fe->window, err);
2272             return;
2273         }
2274
2275         changed_preset(fe);
2276         resize_fe(fe);
2277         midend_redraw(fe->me);
2278     }
2279 }
2280
2281 static void menu_solve_event(GtkMenuItem *menuitem, gpointer data)
2282 {
2283     frontend *fe = (frontend *)data;
2284     char *msg;
2285
2286     msg = midend_solve(fe->me);
2287
2288     if (msg)
2289         error_box(fe->window, msg);
2290 }
2291
2292 static void menu_restart_event(GtkMenuItem *menuitem, gpointer data)
2293 {
2294     frontend *fe = (frontend *)data;
2295
2296     midend_restart_game(fe->me);
2297 }
2298
2299 static void menu_config_event(GtkMenuItem *menuitem, gpointer data)
2300 {
2301     frontend *fe = (frontend *)data;
2302     int which = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(menuitem),
2303                                                   "user-data"));
2304
2305     if (fe->preset_threaded ||
2306         (GTK_IS_CHECK_MENU_ITEM(menuitem) &&
2307          !gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(menuitem))))
2308         return;
2309     changed_preset(fe);                 /* Put the old preset back! */
2310     if (!get_config(fe, which))
2311         return;
2312
2313     midend_new_game(fe->me);
2314     resize_fe(fe);
2315     midend_redraw(fe->me);
2316 }
2317
2318 static void menu_about_event(GtkMenuItem *menuitem, gpointer data)
2319 {
2320     frontend *fe = (frontend *)data;
2321
2322 #if GTK_CHECK_VERSION(3,0,0)
2323     extern char *const *const xpm_icons[];
2324     extern const int n_xpm_icons;
2325     GdkPixbuf *icon = gdk_pixbuf_new_from_xpm_data
2326         ((const gchar **)xpm_icons[n_xpm_icons-1]);
2327     gtk_show_about_dialog
2328         (GTK_WINDOW(fe->window),
2329          "program-name", thegame.name,
2330          "version", ver,
2331          "comments", "Part of Simon Tatham's Portable Puzzle Collection",
2332          "logo", icon,
2333          (const gchar *)NULL);
2334     g_object_unref(G_OBJECT(icon));
2335 #else
2336     char titlebuf[256];
2337     char textbuf[1024];
2338
2339     sprintf(titlebuf, "About %.200s", thegame.name);
2340     sprintf(textbuf,
2341             "%.200s\n\n"
2342             "from Simon Tatham's Portable Puzzle Collection\n\n"
2343             "%.500s", thegame.name, ver);
2344
2345     message_box(fe->window, titlebuf, textbuf, TRUE, MB_OK);
2346 #endif
2347 }
2348
2349 static GtkWidget *add_menu_item_with_key(frontend *fe, GtkContainer *cont,
2350                                          char *text, int key)
2351 {
2352     GtkWidget *menuitem = gtk_menu_item_new_with_label(text);
2353     int keyqual;
2354     gtk_container_add(cont, menuitem);
2355     g_object_set_data(G_OBJECT(menuitem), "user-data", GINT_TO_POINTER(key));
2356     g_signal_connect(G_OBJECT(menuitem), "activate",
2357                      G_CALLBACK(menu_key_event), fe);
2358     switch (key & ~0x1F) {
2359       case 0x00:
2360         key += 0x60;
2361         keyqual = GDK_CONTROL_MASK;
2362         break;
2363       case 0x40:
2364         key += 0x20;
2365         keyqual = GDK_SHIFT_MASK;
2366         break;
2367       default:
2368         keyqual = 0;
2369         break;
2370     }
2371     gtk_widget_add_accelerator(menuitem,
2372                                "activate", fe->accelgroup,
2373                                key, keyqual,
2374                                GTK_ACCEL_VISIBLE);
2375     gtk_widget_show(menuitem);
2376     return menuitem;
2377 }
2378
2379 static void add_menu_separator(GtkContainer *cont)
2380 {
2381     GtkWidget *menuitem = gtk_menu_item_new();
2382     gtk_container_add(cont, menuitem);
2383     gtk_widget_show(menuitem);
2384 }
2385
2386 enum { ARG_EITHER, ARG_SAVE, ARG_ID }; /* for argtype */
2387
2388 static frontend *new_window(char *arg, int argtype, char **error)
2389 {
2390     frontend *fe;
2391     GtkBox *vbox, *hbox;
2392     GtkWidget *menu, *menuitem;
2393     GList *iconlist;
2394     int x, y, n;
2395     char errbuf[1024];
2396     extern char *const *const xpm_icons[];
2397     extern const int n_xpm_icons;
2398
2399     fe = snew(frontend);
2400 #if GTK_CHECK_VERSION(3,20,0)
2401     fe->css_provider = NULL;
2402 #endif
2403
2404     fe->timer_active = FALSE;
2405     fe->timer_id = -1;
2406
2407     fe->me = midend_new(fe, &thegame, &gtk_drawing, fe);
2408
2409     if (arg) {
2410         char *err;
2411         FILE *fp;
2412
2413         errbuf[0] = '\0';
2414
2415         switch (argtype) {
2416           case ARG_ID:
2417             err = midend_game_id(fe->me, arg);
2418             if (!err)
2419                 midend_new_game(fe->me);
2420             else
2421                 sprintf(errbuf, "Invalid game ID: %.800s", err);
2422             break;
2423           case ARG_SAVE:
2424             fp = fopen(arg, "r");
2425             if (!fp) {
2426                 sprintf(errbuf, "Error opening file: %.800s", strerror(errno));
2427             } else {
2428                 err = midend_deserialise(fe->me, savefile_read, fp);
2429                 if (err)
2430                     sprintf(errbuf, "Invalid save file: %.800s", err);
2431                 fclose(fp);
2432             }
2433             break;
2434           default /*case ARG_EITHER*/:
2435             /*
2436              * First try treating the argument as a game ID.
2437              */
2438             err = midend_game_id(fe->me, arg);
2439             if (!err) {
2440                 /*
2441                  * It's a valid game ID.
2442                  */
2443                 midend_new_game(fe->me);
2444             } else {
2445                 FILE *fp = fopen(arg, "r");
2446                 if (!fp) {
2447                     sprintf(errbuf, "Supplied argument is neither a game ID (%.400s)"
2448                             " nor a save file (%.400s)", err, strerror(errno));
2449                 } else {
2450                     err = midend_deserialise(fe->me, savefile_read, fp);
2451                     if (err)
2452                         sprintf(errbuf, "%.800s", err);
2453                     fclose(fp);
2454                 }
2455             }
2456             break;
2457         }
2458         if (*errbuf) {
2459             *error = dupstr(errbuf);
2460             midend_free(fe->me);
2461             sfree(fe);
2462             return NULL;
2463         }
2464
2465     } else {
2466         midend_new_game(fe->me);
2467     }
2468
2469 #if !GTK_CHECK_VERSION(3,0,0)
2470     {
2471         /*
2472          * try_shrink_drawing_area() will do some fiddling with the
2473          * window size request (see comment in that function) after
2474          * all the bits and pieces such as the menu bar and status bar
2475          * have appeared in the puzzle window.
2476          *
2477          * However, on Unity systems, the menu bar _doesn't_ appear in
2478          * the puzzle window, because the Unity shell hijacks it into
2479          * the menu bar at the very top of the screen. We therefore
2480          * try to detect that situation here, so that we don't sit
2481          * here forever waiting for a menu bar.
2482          */
2483         const char prop[] = "gtk-shell-shows-menubar";
2484         GtkSettings *settings = gtk_settings_get_default();
2485         if (!g_object_class_find_property(G_OBJECT_GET_CLASS(settings),
2486                                           prop)) {
2487             fe->menubar_is_local = TRUE;
2488         } else {
2489             int unity_mode;
2490             g_object_get(gtk_settings_get_default(),
2491                          prop, &unity_mode,
2492                          (const gchar *)NULL);
2493             fe->menubar_is_local = !unity_mode;
2494         }
2495     }
2496 #endif
2497
2498     fe->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
2499     gtk_window_set_title(GTK_WINDOW(fe->window), thegame.name);
2500
2501     vbox = GTK_BOX(gtk_vbox_new(FALSE, 0));
2502     gtk_container_add(GTK_CONTAINER(fe->window), GTK_WIDGET(vbox));
2503     gtk_widget_show(GTK_WIDGET(vbox));
2504
2505     fe->accelgroup = gtk_accel_group_new();
2506     gtk_window_add_accel_group(GTK_WINDOW(fe->window), fe->accelgroup);
2507
2508     hbox = GTK_BOX(gtk_hbox_new(FALSE, 0));
2509     gtk_box_pack_start(vbox, GTK_WIDGET(hbox), FALSE, FALSE, 0);
2510     gtk_widget_show(GTK_WIDGET(hbox));
2511
2512     fe->menubar = gtk_menu_bar_new();
2513     gtk_box_pack_start(hbox, fe->menubar, TRUE, TRUE, 0);
2514     gtk_widget_show(fe->menubar);
2515
2516     menuitem = gtk_menu_item_new_with_mnemonic("_Game");
2517     gtk_container_add(GTK_CONTAINER(fe->menubar), menuitem);
2518     gtk_widget_show(menuitem);
2519
2520     menu = gtk_menu_new();
2521     gtk_menu_item_set_submenu(GTK_MENU_ITEM(menuitem), menu);
2522
2523     add_menu_item_with_key(fe, GTK_CONTAINER(menu), "New", 'n');
2524
2525     menuitem = gtk_menu_item_new_with_label("Restart");
2526     gtk_container_add(GTK_CONTAINER(menu), menuitem);
2527     g_signal_connect(G_OBJECT(menuitem), "activate",
2528                      G_CALLBACK(menu_restart_event), fe);
2529     gtk_widget_show(menuitem);
2530
2531     menuitem = gtk_menu_item_new_with_label("Specific...");
2532     g_object_set_data(G_OBJECT(menuitem), "user-data",
2533                       GINT_TO_POINTER(CFG_DESC));
2534     gtk_container_add(GTK_CONTAINER(menu), menuitem);
2535     g_signal_connect(G_OBJECT(menuitem), "activate",
2536                      G_CALLBACK(menu_config_event), fe);
2537     gtk_widget_show(menuitem);
2538
2539     menuitem = gtk_menu_item_new_with_label("Random Seed...");
2540     g_object_set_data(G_OBJECT(menuitem), "user-data",
2541                       GINT_TO_POINTER(CFG_SEED));
2542     gtk_container_add(GTK_CONTAINER(menu), menuitem);
2543     g_signal_connect(G_OBJECT(menuitem), "activate",
2544                      G_CALLBACK(menu_config_event), fe);
2545     gtk_widget_show(menuitem);
2546
2547     fe->preset_radio = NULL;
2548     fe->preset_custom = NULL;
2549     fe->n_preset_menu_items = 0;
2550     fe->preset_threaded = FALSE;
2551     if ((n = midend_num_presets(fe->me)) > 0 || thegame.can_configure) {
2552         GtkWidget *submenu;
2553         int i;
2554
2555         menuitem = gtk_menu_item_new_with_mnemonic("_Type");
2556         gtk_container_add(GTK_CONTAINER(fe->menubar), menuitem);
2557         gtk_widget_show(menuitem);
2558
2559         submenu = gtk_menu_new();
2560         gtk_menu_item_set_submenu(GTK_MENU_ITEM(menuitem), submenu);
2561
2562         for (i = 0; i < n; i++) {
2563             char *name;
2564             game_params *params;
2565
2566             midend_fetch_preset(fe->me, i, &name, &params);
2567
2568             menuitem =
2569                 gtk_radio_menu_item_new_with_label(fe->preset_radio, name);
2570             fe->preset_radio =
2571                 gtk_radio_menu_item_get_group(GTK_RADIO_MENU_ITEM(menuitem));
2572             fe->n_preset_menu_items++;
2573             gtk_container_add(GTK_CONTAINER(submenu), menuitem);
2574             g_object_set_data(G_OBJECT(menuitem), "user-data", params);
2575             g_signal_connect(G_OBJECT(menuitem), "activate",
2576                              G_CALLBACK(menu_preset_event), fe);
2577             gtk_widget_show(menuitem);
2578         }
2579
2580         if (thegame.can_configure) {
2581             menuitem = fe->preset_custom =
2582                 gtk_radio_menu_item_new_with_label(fe->preset_radio,
2583                                                    "Custom...");
2584             fe->preset_radio =
2585                 gtk_radio_menu_item_get_group(GTK_RADIO_MENU_ITEM(menuitem));
2586             gtk_container_add(GTK_CONTAINER(submenu), menuitem);
2587             g_object_set_data(G_OBJECT(menuitem), "user-data",
2588                               GINT_TO_POINTER(CFG_SETTINGS));
2589             g_signal_connect(G_OBJECT(menuitem), "activate",
2590                              G_CALLBACK(menu_config_event), fe);
2591             gtk_widget_show(menuitem);
2592         }
2593
2594     }
2595
2596     add_menu_separator(GTK_CONTAINER(menu));
2597     menuitem = gtk_menu_item_new_with_label("Load...");
2598     gtk_container_add(GTK_CONTAINER(menu), menuitem);
2599     g_signal_connect(G_OBJECT(menuitem), "activate",
2600                      G_CALLBACK(menu_load_event), fe);
2601     gtk_widget_show(menuitem);
2602     menuitem = gtk_menu_item_new_with_label("Save...");
2603     gtk_container_add(GTK_CONTAINER(menu), menuitem);
2604     g_signal_connect(G_OBJECT(menuitem), "activate",
2605                      G_CALLBACK(menu_save_event), fe);
2606     gtk_widget_show(menuitem);
2607 #ifndef STYLUS_BASED
2608     add_menu_separator(GTK_CONTAINER(menu));
2609     add_menu_item_with_key(fe, GTK_CONTAINER(menu), "Undo", 'u');
2610     add_menu_item_with_key(fe, GTK_CONTAINER(menu), "Redo", 'r');
2611 #endif
2612     if (thegame.can_format_as_text_ever) {
2613         add_menu_separator(GTK_CONTAINER(menu));
2614         menuitem = gtk_menu_item_new_with_label("Copy");
2615         gtk_container_add(GTK_CONTAINER(menu), menuitem);
2616         g_signal_connect(G_OBJECT(menuitem), "activate",
2617                          G_CALLBACK(menu_copy_event), fe);
2618         gtk_widget_show(menuitem);
2619         fe->copy_menu_item = menuitem;
2620     } else {
2621         fe->copy_menu_item = NULL;
2622     }
2623     if (thegame.can_solve) {
2624         add_menu_separator(GTK_CONTAINER(menu));
2625         menuitem = gtk_menu_item_new_with_label("Solve");
2626         gtk_container_add(GTK_CONTAINER(menu), menuitem);
2627         g_signal_connect(G_OBJECT(menuitem), "activate",
2628                          G_CALLBACK(menu_solve_event), fe);
2629         gtk_widget_show(menuitem);
2630     }
2631     add_menu_separator(GTK_CONTAINER(menu));
2632     add_menu_item_with_key(fe, GTK_CONTAINER(menu), "Exit", 'q');
2633
2634     menuitem = gtk_menu_item_new_with_mnemonic("_Help");
2635     gtk_container_add(GTK_CONTAINER(fe->menubar), menuitem);
2636     gtk_widget_show(menuitem);
2637
2638     menu = gtk_menu_new();
2639     gtk_menu_item_set_submenu(GTK_MENU_ITEM(menuitem), menu);
2640
2641     menuitem = gtk_menu_item_new_with_label("About");
2642     gtk_container_add(GTK_CONTAINER(menu), menuitem);
2643     g_signal_connect(G_OBJECT(menuitem), "activate",
2644                      G_CALLBACK(menu_about_event), fe);
2645     gtk_widget_show(menuitem);
2646
2647 #ifdef STYLUS_BASED
2648     menuitem=gtk_button_new_with_mnemonic("_Redo");
2649     g_object_set_data(G_OBJECT(menuitem), "user-data",
2650                       GINT_TO_POINTER((int)('r')));
2651     g_signal_connect(G_OBJECT(menuitem), "clicked",
2652                      G_CALLBACK(menu_key_event), fe);
2653     gtk_box_pack_end(hbox, menuitem, FALSE, FALSE, 0);
2654     gtk_widget_show(menuitem);
2655
2656     menuitem=gtk_button_new_with_mnemonic("_Undo");
2657     g_object_set_data(G_OBJECT(menuitem), "user-data",
2658                       GINT_TO_POINTER((int)('u')));
2659     g_signal_connect(G_OBJECT(menuitem), "clicked",
2660                      G_CALLBACK(menu_key_event), fe);
2661     gtk_box_pack_end(hbox, menuitem, FALSE, FALSE, 0);
2662     gtk_widget_show(menuitem);
2663
2664     if (thegame.flags & REQUIRE_NUMPAD) {
2665         hbox = GTK_BOX(gtk_hbox_new(FALSE, 0));
2666         gtk_box_pack_start(vbox, GTK_WIDGET(hbox), FALSE, FALSE, 0);
2667         gtk_widget_show(GTK_WIDGET(hbox));
2668
2669         *((int*)errbuf)=0;
2670         errbuf[1]='\0';
2671         for(errbuf[0]='0';errbuf[0]<='9';errbuf[0]++) {
2672             menuitem=gtk_button_new_with_label(errbuf);
2673             g_object_set_data(G_OBJECT(menuitem), "user-data",
2674                               GINT_TO_POINTER((int)(errbuf[0])));
2675             g_signal_connect(G_OBJECT(menuitem), "clicked",
2676                              G_CALLBACK(menu_key_event), fe);
2677             gtk_box_pack_start(hbox, menuitem, TRUE, TRUE, 0);
2678             gtk_widget_show(menuitem);
2679         }
2680     }
2681 #endif /* STYLUS_BASED */
2682
2683     changed_preset(fe);
2684
2685     snaffle_colours(fe);
2686
2687     if (midend_wants_statusbar(fe->me)) {
2688         GtkWidget *viewport;
2689         GtkRequisition req;
2690
2691         viewport = gtk_viewport_new(NULL, NULL);
2692         gtk_viewport_set_shadow_type(GTK_VIEWPORT(viewport), GTK_SHADOW_NONE);
2693         fe->statusbar = gtk_statusbar_new();
2694         gtk_container_add(GTK_CONTAINER(viewport), fe->statusbar);
2695         gtk_widget_show(viewport);
2696         gtk_box_pack_end(vbox, viewport, FALSE, FALSE, 0);
2697         gtk_widget_show(fe->statusbar);
2698         fe->statusctx = gtk_statusbar_get_context_id
2699             (GTK_STATUSBAR(fe->statusbar), "game");
2700         gtk_statusbar_push(GTK_STATUSBAR(fe->statusbar), fe->statusctx,
2701                            DEFAULT_STATUSBAR_TEXT);
2702 #if GTK_CHECK_VERSION(3,0,0)
2703         gtk_widget_get_preferred_size(fe->statusbar, &req, NULL);
2704 #else
2705         gtk_widget_size_request(fe->statusbar, &req);
2706 #endif
2707         gtk_widget_set_size_request(viewport, -1, req.height);
2708     } else
2709         fe->statusbar = NULL;
2710
2711     fe->area = gtk_drawing_area_new();
2712 #if GTK_CHECK_VERSION(2,0,0) && !GTK_CHECK_VERSION(3,0,0)
2713     gtk_widget_set_double_buffered(fe->area, FALSE);
2714 #endif
2715     {
2716         GdkGeometry geom;
2717         geom.base_width = 0;
2718 #if GTK_CHECK_VERSION(3,0,0)
2719         geom.base_height = window_extra_height(fe);
2720         gtk_window_set_geometry_hints(GTK_WINDOW(fe->window), NULL,
2721                                       &geom, GDK_HINT_BASE_SIZE);
2722 #else
2723         geom.base_height = 0;
2724         gtk_window_set_geometry_hints(GTK_WINDOW(fe->window), fe->area,
2725                                       &geom, GDK_HINT_BASE_SIZE);
2726 #endif
2727     }
2728     fe->w = -1;
2729     fe->h = -1;
2730     get_size(fe, &x, &y);
2731 #if GTK_CHECK_VERSION(3,0,0)
2732     gtk_window_set_default_size(GTK_WINDOW(fe->window),
2733                                 x, y + window_extra_height(fe));
2734 #else
2735     fe->drawing_area_shrink_pending = FALSE;
2736     gtk_drawing_area_size(GTK_DRAWING_AREA(fe->area), x, y);
2737 #endif
2738
2739     gtk_box_pack_end(vbox, fe->area, TRUE, TRUE, 0);
2740
2741     clear_backing_store(fe);
2742     fe->fonts = NULL;
2743     fe->nfonts = fe->fontsize = 0;
2744
2745     fe->paste_data = NULL;
2746     fe->paste_data_len = 0;
2747
2748     g_signal_connect(G_OBJECT(fe->window), "destroy",
2749                      G_CALLBACK(destroy), fe);
2750     g_signal_connect(G_OBJECT(fe->window), "key_press_event",
2751                      G_CALLBACK(key_event), fe);
2752     g_signal_connect(G_OBJECT(fe->area), "button_press_event",
2753                      G_CALLBACK(button_event), fe);
2754     g_signal_connect(G_OBJECT(fe->area), "button_release_event",
2755                      G_CALLBACK(button_event), fe);
2756     g_signal_connect(G_OBJECT(fe->area), "motion_notify_event",
2757                      G_CALLBACK(motion_event), fe);
2758     g_signal_connect(G_OBJECT(fe->area), "selection_get",
2759                      G_CALLBACK(selection_get), fe);
2760     g_signal_connect(G_OBJECT(fe->area), "selection_clear_event",
2761                      G_CALLBACK(selection_clear), fe);
2762 #if GTK_CHECK_VERSION(3,0,0)
2763     g_signal_connect(G_OBJECT(fe->area), "draw",
2764                      G_CALLBACK(draw_area), fe);
2765 #else
2766     g_signal_connect(G_OBJECT(fe->area), "expose_event",
2767                      G_CALLBACK(expose_area), fe);
2768 #endif
2769     g_signal_connect(G_OBJECT(fe->window), "map_event",
2770                      G_CALLBACK(map_window), fe);
2771     g_signal_connect(G_OBJECT(fe->area), "configure_event",
2772                      G_CALLBACK(configure_area), fe);
2773     g_signal_connect(G_OBJECT(fe->window), "configure_event",
2774                      G_CALLBACK(configure_window), fe);
2775
2776     gtk_widget_add_events(GTK_WIDGET(fe->area),
2777                           GDK_BUTTON_PRESS_MASK |
2778                           GDK_BUTTON_RELEASE_MASK |
2779                           GDK_BUTTON_MOTION_MASK |
2780                           GDK_POINTER_MOTION_HINT_MASK);
2781
2782     if (n_xpm_icons) {
2783         gtk_window_set_icon(GTK_WINDOW(fe->window),
2784                             gdk_pixbuf_new_from_xpm_data
2785                             ((const gchar **)xpm_icons[0]));
2786
2787         iconlist = NULL;
2788         for (n = 0; n < n_xpm_icons; n++) {
2789             iconlist =
2790                 g_list_append(iconlist,
2791                               gdk_pixbuf_new_from_xpm_data((const gchar **)
2792                                                            xpm_icons[n]));
2793         }
2794         gtk_window_set_icon_list(GTK_WINDOW(fe->window), iconlist);
2795     }
2796
2797     gtk_widget_show(fe->area);
2798     gtk_widget_show(fe->window);
2799
2800 #if !GTK_CHECK_VERSION(3,0,0)
2801     fe->drawing_area_shrink_pending = TRUE;
2802     try_shrink_drawing_area(fe);
2803 #endif
2804
2805     set_window_background(fe, 0);
2806
2807     return fe;
2808 }
2809
2810 char *fgetline(FILE *fp)
2811 {
2812     char *ret = snewn(512, char);
2813     int size = 512, len = 0;
2814     while (fgets(ret + len, size - len, fp)) {
2815         len += strlen(ret + len);
2816         if (ret[len-1] == '\n')
2817             break;                     /* got a newline, we're done */
2818         size = len + 512;
2819         ret = sresize(ret, size, char);
2820     }
2821     if (len == 0) {                    /* first fgets returned NULL */
2822         sfree(ret);
2823         return NULL;
2824     }
2825     ret[len] = '\0';
2826     return ret;
2827 }
2828
2829 int main(int argc, char **argv)
2830 {
2831     char *pname = argv[0];
2832     char *error;
2833     int ngenerate = 0, print = FALSE, px = 1, py = 1;
2834     int time_generation = FALSE, test_solve = FALSE, list_presets = FALSE;
2835     int soln = FALSE, colour = FALSE;
2836     float scale = 1.0F;
2837     float redo_proportion = 0.0F;
2838     char *savefile = NULL, *savesuffix = NULL;
2839     char *arg = NULL;
2840     int argtype = ARG_EITHER;
2841     char *screenshot_file = NULL;
2842     int doing_opts = TRUE;
2843     int ac = argc;
2844     char **av = argv;
2845     char errbuf[500];
2846
2847     /*
2848      * Command line parsing in this function is rather fiddly,
2849      * because GTK wants to have a go at argc/argv _first_ - and
2850      * yet we can't let it, because gtk_init() will bomb out if it
2851      * can't open an X display, whereas in fact we want to permit
2852      * our --generate and --print modes to run without an X
2853      * display.
2854      *
2855      * So what we do is:
2856      *  - we parse the command line ourselves, without modifying
2857      *    argc/argv
2858      *  - if we encounter an error which might plausibly be the
2859      *    result of a GTK command line (i.e. not detailed errors in
2860      *    particular options of ours) we store the error message
2861      *    and terminate parsing.
2862      *  - if we got enough out of the command line to know it
2863      *    specifies a non-X mode of operation, we either display
2864      *    the stored error and return failure, or if there is no
2865      *    stored error we do the non-X operation and return
2866      *    success.
2867      *  - otherwise, we go straight to gtk_init().
2868      */
2869
2870     errbuf[0] = '\0';
2871     while (--ac > 0) {
2872         char *p = *++av;
2873         if (doing_opts && !strcmp(p, "--version")) {
2874             printf("%s, from Simon Tatham's Portable Puzzle Collection\n%s\n",
2875                    thegame.name, ver);
2876             return 0;
2877         } else if (doing_opts && !strcmp(p, "--generate")) {
2878             if (--ac > 0) {
2879                 ngenerate = atoi(*++av);
2880                 if (!ngenerate) {
2881                     fprintf(stderr, "%s: '--generate' expected a number\n",
2882                             pname);
2883                     return 1;
2884                 }
2885             } else
2886                 ngenerate = 1;
2887         } else if (doing_opts && !strcmp(p, "--time-generation")) {
2888             time_generation = TRUE;
2889         } else if (doing_opts && !strcmp(p, "--test-solve")) {
2890             test_solve = TRUE;
2891         } else if (doing_opts && !strcmp(p, "--list-presets")) {
2892             list_presets = TRUE;
2893         } else if (doing_opts && !strcmp(p, "--save")) {
2894             if (--ac > 0) {
2895                 savefile = *++av;
2896             } else {
2897                 fprintf(stderr, "%s: '--save' expected a filename\n",
2898                         pname);
2899                 return 1;
2900             }
2901         } else if (doing_opts && (!strcmp(p, "--save-suffix") ||
2902                                   !strcmp(p, "--savesuffix"))) {
2903             if (--ac > 0) {
2904                 savesuffix = *++av;
2905             } else {
2906                 fprintf(stderr, "%s: '--save-suffix' expected a filename\n",
2907                         pname);
2908                 return 1;
2909             }
2910         } else if (doing_opts && !strcmp(p, "--print")) {
2911             if (!thegame.can_print) {
2912                 fprintf(stderr, "%s: this game does not support printing\n",
2913                         pname);
2914                 return 1;
2915             }
2916             print = TRUE;
2917             if (--ac > 0) {
2918                 char *dim = *++av;
2919                 if (sscanf(dim, "%dx%d", &px, &py) != 2) {
2920                     fprintf(stderr, "%s: unable to parse argument '%s' to "
2921                             "'--print'\n", pname, dim);
2922                     return 1;
2923                 }
2924             } else {
2925                 px = py = 1;
2926             }
2927         } else if (doing_opts && !strcmp(p, "--scale")) {
2928             if (--ac > 0) {
2929                 scale = atof(*++av);
2930             } else {
2931                 fprintf(stderr, "%s: no argument supplied to '--scale'\n",
2932                         pname);
2933                 return 1;
2934             }
2935         } else if (doing_opts && !strcmp(p, "--redo")) {
2936             /*
2937              * This is an internal option which I don't expect
2938              * users to have any particular use for. The effect of
2939              * --redo is that once the game has been loaded and
2940              * initialised, the next move in the redo chain is
2941              * replayed, and the game screen is redrawn part way
2942              * through the making of the move. This is only
2943              * meaningful if there _is_ a next move in the redo
2944              * chain, which means in turn that this option is only
2945              * useful if you're also passing a save file on the
2946              * command line.
2947              *
2948              * This option is used by the script which generates
2949              * the puzzle icons and website screenshots, and I
2950              * don't imagine it's useful for anything else.
2951              * (Unless, I suppose, users don't like my screenshots
2952              * and want to generate their own in the same way for
2953              * some repackaged version of the puzzles.)
2954              */
2955             if (--ac > 0) {
2956                 redo_proportion = atof(*++av);
2957             } else {
2958                 fprintf(stderr, "%s: no argument supplied to '--redo'\n",
2959                         pname);
2960                 return 1;
2961             }
2962         } else if (doing_opts && !strcmp(p, "--screenshot")) {
2963             /*
2964              * Another internal option for the icon building
2965              * script. This causes a screenshot of the central
2966              * drawing area (i.e. not including the menu bar or
2967              * status bar) to be saved to a PNG file once the
2968              * window has been drawn, and then the application
2969              * quits immediately.
2970              */
2971             if (--ac > 0) {
2972                 screenshot_file = *++av;
2973             } else {
2974                 fprintf(stderr, "%s: no argument supplied to '--screenshot'\n",
2975                         pname);
2976                 return 1;
2977             }
2978         } else if (doing_opts && (!strcmp(p, "--with-solutions") ||
2979                                   !strcmp(p, "--with-solution") ||
2980                                   !strcmp(p, "--with-solns") ||
2981                                   !strcmp(p, "--with-soln") ||
2982                                   !strcmp(p, "--solutions") ||
2983                                   !strcmp(p, "--solution") ||
2984                                   !strcmp(p, "--solns") ||
2985                                   !strcmp(p, "--soln"))) {
2986             soln = TRUE;
2987         } else if (doing_opts && !strcmp(p, "--colour")) {
2988             if (!thegame.can_print_in_colour) {
2989                 fprintf(stderr, "%s: this game does not support colour"
2990                         " printing\n", pname);
2991                 return 1;
2992             }
2993             colour = TRUE;
2994         } else if (doing_opts && !strcmp(p, "--load")) {
2995             argtype = ARG_SAVE;
2996         } else if (doing_opts && !strcmp(p, "--game")) {
2997             argtype = ARG_ID;
2998         } else if (doing_opts && !strcmp(p, "--")) {
2999             doing_opts = FALSE;
3000         } else if (!doing_opts || p[0] != '-') {
3001             if (arg) {
3002                 fprintf(stderr, "%s: more than one argument supplied\n",
3003                         pname);
3004                 return 1;
3005             }
3006             arg = p;
3007         } else {
3008             sprintf(errbuf, "%.100s: unrecognised option '%.100s'\n",
3009                     pname, p);
3010             break;
3011         }
3012     }
3013
3014     /*
3015      * Special standalone mode for generating puzzle IDs on the
3016      * command line. Useful for generating puzzles to be printed
3017      * out and solved offline (for puzzles where that even makes
3018      * sense - Solo, for example, is a lot more pencil-and-paper
3019      * friendly than Twiddle!)
3020      *
3021      * Usage:
3022      *
3023      *   <puzzle-name> --generate [<n> [<params>]]
3024      *
3025      * <n>, if present, is the number of puzzle IDs to generate.
3026      * <params>, if present, is the same type of parameter string
3027      * you would pass to the puzzle when running it in GUI mode,
3028      * including optional extras such as the expansion factor in
3029      * Rectangles and the difficulty level in Solo.
3030      *
3031      * If you specify <params>, you must also specify <n> (although
3032      * you may specify it to be 1). Sorry; that was the
3033      * simplest-to-parse command-line syntax I came up with.
3034      */
3035     if (ngenerate > 0 || print || savefile || savesuffix) {
3036         int i, n = 1;
3037         midend *me;
3038         char *id;
3039         document *doc = NULL;
3040
3041         /*
3042          * If we're in this branch, we should display any pending
3043          * error message from the command line, since GTK isn't going
3044          * to take another crack at making sense of it.
3045          */
3046         if (*errbuf) {
3047             fputs(errbuf, stderr);
3048             return 1;
3049         }
3050
3051         n = ngenerate;
3052
3053         me = midend_new(NULL, &thegame, NULL, NULL);
3054         i = 0;
3055
3056         if (savefile && !savesuffix)
3057             savesuffix = "";
3058         if (!savefile && savesuffix)
3059             savefile = "";
3060
3061         if (print)
3062             doc = document_new(px, py, scale);
3063
3064         /*
3065          * In this loop, we either generate a game ID or read one
3066          * from stdin depending on whether we're in generate mode;
3067          * then we either write it to stdout or print it, depending
3068          * on whether we're in print mode. Thus, this loop handles
3069          * generate-to-stdout, print-from-stdin and generate-and-
3070          * immediately-print modes.
3071          *
3072          * (It could also handle a copy-stdin-to-stdout mode,
3073          * although there's currently no combination of options
3074          * which will cause this loop to be activated in that mode.
3075          * It wouldn't be _entirely_ pointless, though, because
3076          * stdin could contain bare params strings or random-seed
3077          * IDs, and stdout would contain nothing but fully
3078          * generated descriptive game IDs.)
3079          */
3080         while (ngenerate == 0 || i < n) {
3081             char *pstr, *err, *seed;
3082             struct rusage before, after;
3083
3084             if (ngenerate == 0) {
3085                 pstr = fgetline(stdin);
3086                 if (!pstr)
3087                     break;
3088                 pstr[strcspn(pstr, "\r\n")] = '\0';
3089             } else {
3090                 if (arg) {
3091                     pstr = snewn(strlen(arg) + 40, char);
3092
3093                     strcpy(pstr, arg);
3094                     if (i > 0 && strchr(arg, '#'))
3095                         sprintf(pstr + strlen(pstr), "-%d", i);
3096                 } else
3097                     pstr = NULL;
3098             }
3099
3100             if (pstr) {
3101                 err = midend_game_id(me, pstr);
3102                 if (err) {
3103                     fprintf(stderr, "%s: error parsing '%s': %s\n",
3104                             pname, pstr, err);
3105                     return 1;
3106                 }
3107             }
3108
3109             if (time_generation)
3110                 getrusage(RUSAGE_SELF, &before);
3111
3112             midend_new_game(me);
3113
3114             seed = midend_get_random_seed(me);
3115
3116             if (time_generation) {
3117                 double elapsed;
3118
3119                 getrusage(RUSAGE_SELF, &after);
3120
3121                 elapsed = (after.ru_utime.tv_sec -
3122                            before.ru_utime.tv_sec);
3123                 elapsed += (after.ru_utime.tv_usec -
3124                             before.ru_utime.tv_usec) / 1000000.0;
3125
3126                 printf("%s %s: %.6f\n", thegame.name, seed, elapsed);
3127             }
3128
3129             if (test_solve && thegame.can_solve) {
3130                 /*
3131                  * Now destroy the aux_info in the midend, by means of
3132                  * re-entering the same game id, and then try to solve
3133                  * it.
3134                  */
3135                 char *game_id, *err;
3136
3137                 game_id = midend_get_game_id(me);
3138                 err = midend_game_id(me, game_id);
3139                 if (err) {
3140                     fprintf(stderr, "%s %s: game id re-entry error: %s\n",
3141                             thegame.name, seed, err);
3142                     return 1;
3143                 }
3144                 midend_new_game(me);
3145                 sfree(game_id);
3146
3147                 err = midend_solve(me);
3148                 /*
3149                  * If the solve operation returned the error "Solution
3150                  * not known for this puzzle", that's OK, because that
3151                  * just means it's a puzzle for which we don't have an
3152                  * algorithmic solver and hence can't solve it without
3153                  * the aux_info, e.g. Netslide. Any other error is a
3154                  * problem, though.
3155                  */
3156                 if (err && strcmp(err, "Solution not known for this puzzle")) {
3157                     fprintf(stderr, "%s %s: solve error: %s\n",
3158                             thegame.name, seed, err);
3159                     return 1;
3160                 }
3161             }
3162
3163             sfree(pstr);
3164             sfree(seed);
3165
3166             if (doc) {
3167                 err = midend_print_puzzle(me, doc, soln);
3168                 if (err) {
3169                     fprintf(stderr, "%s: error in printing: %s\n", pname, err);
3170                     return 1;
3171                 }
3172             }
3173             if (savefile) {
3174                 struct savefile_write_ctx ctx;
3175                 char *realname = snewn(40 + strlen(savefile) +
3176                                        strlen(savesuffix), char);
3177                 sprintf(realname, "%s%d%s", savefile, i, savesuffix);
3178
3179                 if (soln) {
3180                     char *err = midend_solve(me);
3181                     if (err) {
3182                         fprintf(stderr, "%s: unable to show solution: %s\n",
3183                                 realname, err);
3184                         return 1;
3185                     }
3186                 }
3187
3188                 ctx.fp = fopen(realname, "w");
3189                 if (!ctx.fp) {
3190                     fprintf(stderr, "%s: open: %s\n", realname,
3191                             strerror(errno));
3192                     return 1;
3193                 }
3194                 ctx.error = 0;
3195                 midend_serialise(me, savefile_write, &ctx);
3196                 if (ctx.error) {
3197                     fprintf(stderr, "%s: write: %s\n", realname,
3198                             strerror(ctx.error));
3199                     return 1;
3200                 }
3201                 if (fclose(ctx.fp)) {
3202                     fprintf(stderr, "%s: close: %s\n", realname,
3203                             strerror(errno));
3204                     return 1;
3205                 }
3206                 sfree(realname);
3207             }
3208             if (!doc && !savefile && !time_generation) {
3209                 id = midend_get_game_id(me);
3210                 puts(id);
3211                 sfree(id);
3212             }
3213
3214             i++;
3215         }
3216
3217         if (doc) {
3218             psdata *ps = ps_init(stdout, colour);
3219             document_print(doc, ps_drawing_api(ps));
3220             document_free(doc);
3221             ps_free(ps);
3222         }
3223
3224         midend_free(me);
3225
3226         return 0;
3227     } else if (list_presets) {
3228         /*
3229          * Another specialist mode which causes the puzzle to list the
3230          * game_params strings for all its preset configurations.
3231          */
3232         int i, npresets;
3233         midend *me;
3234
3235         me = midend_new(NULL, &thegame, NULL, NULL);
3236         npresets = midend_num_presets(me);
3237
3238         for (i = 0; i < npresets; i++) {
3239             game_params *params;
3240             char *name, *paramstr;
3241
3242             midend_fetch_preset(me, i, &name, &params);
3243             paramstr = thegame.encode_params(params, TRUE);
3244
3245             printf("%s %s\n", paramstr, name);
3246             sfree(paramstr);
3247         }
3248
3249         midend_free(me);
3250         return 0;
3251     } else {
3252         frontend *fe;
3253
3254         gtk_init(&argc, &argv);
3255
3256         fe = new_window(arg, argtype, &error);
3257
3258         if (!fe) {
3259             fprintf(stderr, "%s: %s\n", pname, error);
3260             return 1;
3261         }
3262
3263         if (screenshot_file) {
3264             /*
3265              * Some puzzles will not redraw their entire area if
3266              * given a partially completed animation, which means
3267              * we must redraw now and _then_ redraw again after
3268              * freezing the move timer.
3269              */
3270             midend_force_redraw(fe->me);
3271         }
3272
3273         if (redo_proportion) {
3274             /* Start a redo. */
3275             midend_process_key(fe->me, 0, 0, 'r');
3276             /* And freeze the timer at the specified position. */
3277             midend_freeze_timer(fe->me, redo_proportion);
3278         }
3279
3280         if (screenshot_file) {
3281             save_screenshot_png(fe, screenshot_file);
3282             exit(0);
3283         }
3284
3285         gtk_main();
3286     }
3287
3288     return 0;
3289 }