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 /* #undef USE_CAIRO */
  48 /* #define NO_THICK_LINE */
  49 #ifdef DEBUGGING
  50 static FILE *debug_fp = NULL;
  51
  52 void dputs(char *buf)
  53 {
  54     if (!debug_fp) {
  55         debug_fp = fopen("debug.log", "w");
  56     }
  57
  58     fputs(buf, stderr);
  59
  60     if (debug_fp) {
  61         fputs(buf, debug_fp);
  62         fflush(debug_fp);
  63     }
  64 }
  65
  66 void debug_printf(char *fmt, ...)
  67 {
  68     char buf[4096];
  69     va_list ap;
  70
  71     va_start(ap, fmt);
  72     vsprintf(buf, fmt, ap);
  73     dputs(buf);
  74     va_end(ap);
  75 }
  76 #endif
  77
  78 /* ----------------------------------------------------------------------
  79  * Error reporting functions used elsewhere.
  80  */
  81
  82 void fatal(char *fmt, ...)
  83 {
  84     va_list ap;
  85
  86     fprintf(stderr, "fatal error: ");
  87
  88     va_start(ap, fmt);
  89     vfprintf(stderr, fmt, ap);
  90     va_end(ap);
  91
  92     fprintf(stderr, "\n");
  93     exit(1);
  94 }
  95
  96 /* ----------------------------------------------------------------------
  97  * GTK front end to puzzles.
  98  */
  99
 100 static void changed_preset(frontend *fe);
 101
 102 struct font {
 103 #ifdef USE_PANGO
 104     PangoFontDescription *desc;
 105 #else
 106     GdkFont *font;
 107 #endif
 108     int type;
 109     int size;
 110 };
 111
 112 /*
 113  * This structure holds all the data relevant to a single window.
 114  * In principle this would allow us to open multiple independent
 115  * puzzle windows, although I can't currently see any real point in
 116  * doing so. I'm just coding cleanly because there's no
 117  * particularly good reason not to.
 118  */
 119 struct frontend {
 120     GtkWidget *window;
 121     GtkAccelGroup *accelgroup;
 122     GtkWidget *area;
 123     GtkWidget *statusbar;
 124     GtkWidget *menubar;
 125     guint statusctx;
 126     int w, h;
 127     midend *me;
 128 #ifdef USE_CAIRO
 129     const float *colours;
 130     cairo_t *cr;
 131     cairo_surface_t *image;
 132 #ifndef USE_CAIRO_WITHOUT_PIXMAP
 133     GdkPixmap *pixmap;
 134 #endif
 135     GdkColor background;               /* for painting outside puzzle area */
 136 #else
 137     GdkPixmap *pixmap;
 138     GdkGC *gc;
 139     GdkColor *colours;
 140     GdkColormap *colmap;
 141     int backgroundindex;               /* which of colours[] is background */
 142 #endif
 143     int ncolours;
 144     int bbox_l, bbox_r, bbox_u, bbox_d;
 145     int timer_active, timer_id;
 146     struct timeval last_time;
 147     struct font *fonts;
 148     int nfonts, fontsize;
 149     config_item *cfg;
 150     int cfg_which, cfgret;
 151     GtkWidget *cfgbox;
 152     void *paste_data;
 153     int paste_data_len;
 154     int pw, ph;                        /* pixmap size (w, h are area size) */
 155     int ox, oy;                        /* offset of pixmap in drawing area */
 156 #ifdef OLD_FILESEL
 157     char *filesel_name;
 158 #endif
 159     GSList *preset_radio;
 160     int n_preset_menu_items;
 161     int preset_threaded;
 162     GtkWidget *preset_custom;
 163     GtkWidget *copy_menu_item;
 164 #if !GTK_CHECK_VERSION(3,0,0)
 165     int drawing_area_shrink_pending;
 166     int menubar_is_local;
 167 #endif
 168 };
 169
 170 struct blitter {
 171 #ifdef USE_CAIRO
 172     cairo_surface_t *image;
 173 #else
 174     GdkPixmap *pixmap;
 175 #endif
 176     int w, h, x, y;
 177 };
 178
 179 void get_random_seed(void **randseed, int *randseedsize)
 180 {
 181     struct timeval *tvp = snew(struct timeval);
 182     gettimeofday(tvp, NULL);
 183     *randseed = (void *)tvp;
 184     *randseedsize = sizeof(struct timeval);
 185 }
 186
 187 void frontend_default_colour(frontend *fe, float *output)
 188 {
 189 #if !GTK_CHECK_VERSION(3,0,0)
 190     /*
 191      * Use the widget style's default background colour as the
 192      * background for the puzzle drawing area.
 193      */
 194     GdkColor col = gtk_widget_get_style(fe->window)->bg[GTK_STATE_NORMAL];
 195     output[0] = col.red / 65535.0;
 196     output[1] = col.green / 65535.0;
 197     output[2] = col.blue / 65535.0;
 198 #else
 199     /*
 200      * GTK 3 has decided that there's no such thing as a 'default
 201      * background colour' any more, because widget styles might set
 202      * the background to something more complicated like a background
 203      * image. We don't want to get into overlaying our entire puzzle
 204      * on an arbitrary background image, so we'll just make up a
 205      * reasonable shade of grey.
 206      */
 207     output[0] = output[1] = output[2] = 0.9F;
 208 #endif
 209 }
 210
 211 void gtk_status_bar(void *handle, char *text)
 212 {
 213     frontend *fe = (frontend *)handle;
 214
 215     assert(fe->statusbar);
 216
 217     gtk_statusbar_pop(GTK_STATUSBAR(fe->statusbar), fe->statusctx);
 218     gtk_statusbar_push(GTK_STATUSBAR(fe->statusbar), fe->statusctx, text);
 219 }
 220
 221 /* ----------------------------------------------------------------------
 222  * Cairo drawing functions.
 223  */
 224
 225 #ifdef USE_CAIRO
 226
 227 static void setup_drawing(frontend *fe)
 228 {
 229     fe->cr = cairo_create(fe->image);
 230     cairo_set_antialias(fe->cr, CAIRO_ANTIALIAS_GRAY);
 231     cairo_set_line_width(fe->cr, 1.0);
 232     cairo_set_line_cap(fe->cr, CAIRO_LINE_CAP_SQUARE);
 233     cairo_set_line_join(fe->cr, CAIRO_LINE_JOIN_ROUND);
 234 }
 235
 236 static void teardown_drawing(frontend *fe)
 237 {
 238     cairo_destroy(fe->cr);
 239     fe->cr = NULL;
 240
 241 #ifndef USE_CAIRO_WITHOUT_PIXMAP
 242     {
 243         cairo_t *cr = gdk_cairo_create(fe->pixmap);
 244         cairo_set_source_surface(cr, fe->image, 0, 0);
 245         cairo_rectangle(cr,
 246                         fe->bbox_l - 1,
 247                         fe->bbox_u - 1,
 248                         fe->bbox_r - fe->bbox_l + 2,
 249                         fe->bbox_d - fe->bbox_u + 2);
 250         cairo_fill(cr);
 251         cairo_destroy(cr);
 252     }
 253 #endif
 254 }
 255
 256 static void snaffle_colours(frontend *fe)
 257 {
 258     fe->colours = midend_colours(fe->me, &fe->ncolours);
 259 }
 260
 261 static void set_colour(frontend *fe, int colour)
 262 {
 263     cairo_set_source_rgb(fe->cr,
 264                          fe->colours[3*colour + 0],
 265                          fe->colours[3*colour + 1],
 266                          fe->colours[3*colour + 2]);
 267 }
 268
 269 static void set_window_background(frontend *fe, int colour)
 270 {
 271     GdkColormap *colmap;
 272
 273     colmap = gdk_colormap_get_system();
 274     fe->background.red = fe->colours[3*colour + 0] * 65535;
 275     fe->background.green = fe->colours[3*colour + 1] * 65535;
 276     fe->background.blue = fe->colours[3*colour + 2] * 65535;
 277     if (!gdk_colormap_alloc_color(colmap, &fe->background, FALSE, FALSE)) {
 278         g_error("couldn't allocate background (#%02x%02x%02x)\n",
 279                 fe->background.red >> 8, fe->background.green >> 8,
 280                 fe->background.blue >> 8);
 281     }
 282     gdk_window_set_background(gtk_widget_get_window(fe->area),
 283                               &fe->background);
 284     gdk_window_set_background(gtk_widget_get_window(fe->window),
 285                               &fe->background);
 286 }
 287
 288 static PangoLayout *make_pango_layout(frontend *fe)
 289 {
 290     return (pango_cairo_create_layout(fe->cr));
 291 }
 292
 293 static void draw_pango_layout(frontend *fe, PangoLayout *layout,
 294                               int x, int y)
 295 {
 296     cairo_move_to(fe->cr, x, y);
 297     pango_cairo_show_layout(fe->cr, layout);
 298 }
 299
 300 static void save_screenshot_png(frontend *fe, const char *screenshot_file)
 301 {
 302     cairo_surface_write_to_png(fe->image, screenshot_file);
 303 }
 304
 305 static void do_clip(frontend *fe, int x, int y, int w, int h)
 306 {
 307     cairo_new_path(fe->cr);
 308     cairo_rectangle(fe->cr, x, y, w, h);
 309     cairo_clip(fe->cr);
 310 }
 311
 312 static void do_unclip(frontend *fe)
 313 {
 314     cairo_reset_clip(fe->cr);
 315 }
 316
 317 static void do_draw_rect(frontend *fe, int x, int y, int w, int h)
 318 {
 319     cairo_save(fe->cr);
 320     cairo_new_path(fe->cr);
 321     cairo_set_antialias(fe->cr, CAIRO_ANTIALIAS_NONE);
 322     cairo_rectangle(fe->cr, x, y, w, h);
 323     cairo_fill(fe->cr);
 324     cairo_restore(fe->cr);
 325 }
 326
 327 static void do_draw_line(frontend *fe, int x1, int y1, int x2, int y2)
 328 {
 329     cairo_new_path(fe->cr);
 330     cairo_move_to(fe->cr, x1 + 0.5, y1 + 0.5);
 331     cairo_line_to(fe->cr, x2 + 0.5, y2 + 0.5);
 332     cairo_stroke(fe->cr);
 333 }
 334
 335 static void do_draw_thick_line(frontend *fe, float thickness,
 336                                float x1, float y1, float x2, float y2)
 337 {
 338     cairo_save(fe->cr);
 339     cairo_set_line_width(fe->cr, thickness);
 340     cairo_new_path(fe->cr);
 341     cairo_move_to(fe->cr, x1, y1);
 342     cairo_line_to(fe->cr, x2, y2);
 343     cairo_stroke(fe->cr);
 344     cairo_restore(fe->cr);
 345 }
 346
 347 static void do_draw_poly(frontend *fe, int *coords, int npoints,
 348                          int fillcolour, int outlinecolour)
 349 {
 350     int i;
 351
 352     cairo_new_path(fe->cr);
 353     for (i = 0; i < npoints; i++)
 354         cairo_line_to(fe->cr, coords[i*2] + 0.5, coords[i*2 + 1] + 0.5);
 355     cairo_close_path(fe->cr);
 356     if (fillcolour >= 0) {
 357         set_colour(fe, fillcolour);
 358         cairo_fill_preserve(fe->cr);
 359     }
 360     assert(outlinecolour >= 0);
 361     set_colour(fe, outlinecolour);
 362     cairo_stroke(fe->cr);
 363 }
 364
 365 static void do_draw_circle(frontend *fe, int cx, int cy, int radius,
 366                            int fillcolour, int outlinecolour)
 367 {
 368     cairo_new_path(fe->cr);
 369     cairo_arc(fe->cr, cx + 0.5, cy + 0.5, radius, 0, 2*PI);
 370     cairo_close_path(fe->cr);           /* Just in case... */
 371     if (fillcolour >= 0) {
 372         set_colour(fe, fillcolour);
 373         cairo_fill_preserve(fe->cr);
 374     }
 375     assert(outlinecolour >= 0);
 376     set_colour(fe, outlinecolour);
 377     cairo_stroke(fe->cr);
 378 }
 379
 380 static void setup_blitter(blitter *bl, int w, int h)
 381 {
 382     bl->image = cairo_image_surface_create(CAIRO_FORMAT_RGB24, w, h);
 383 }
 384
 385 static void teardown_blitter(blitter *bl)
 386 {
 387     cairo_surface_destroy(bl->image);
 388 }
 389
 390 static void do_blitter_save(frontend *fe, blitter *bl, int x, int y)
 391 {
 392     cairo_t *cr = cairo_create(bl->image);
 393
 394     cairo_set_source_surface(cr, fe->image, -x, -y);
 395     cairo_paint(cr);
 396     cairo_destroy(cr);
 397 }
 398
 399 static void do_blitter_load(frontend *fe, blitter *bl, int x, int y)
 400 {
 401     cairo_set_source_surface(fe->cr, bl->image, x, y);
 402     cairo_paint(fe->cr);
 403 }
 404
 405 static void clear_backing_store(frontend *fe)
 406 {
 407     fe->image = NULL;
 408 }
 409
 410 static void wipe_and_destroy_cairo(frontend *fe, cairo_t *cr)
 411 {
 412     cairo_set_source_rgb(cr, fe->colours[0], fe->colours[1], fe->colours[2]);
 413     cairo_paint(cr);
 414     cairo_destroy(cr);
 415 }
 416
 417 static void setup_backing_store(frontend *fe)
 418 {
 419 #ifndef USE_CAIRO_WITHOUT_PIXMAP
 420     fe->pixmap = gdk_pixmap_new(gtk_widget_get_window(fe->area),
 421                                 fe->pw, fe->ph, -1);
 422 #endif
 423     fe->image = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
 424                                            fe->pw, fe->ph);
 425
 426     wipe_and_destroy_cairo(fe, cairo_create(fe->image));
 427 #ifndef USE_CAIRO_WITHOUT_PIXMAP
 428     wipe_and_destroy_cairo(fe, gdk_cairo_create(fe->pixmap));
 429 #endif
 430     wipe_and_destroy_cairo(fe, gdk_cairo_create
 431                            (gtk_widget_get_window(fe->area)));
 432 }
 433
 434 static int backing_store_ok(frontend *fe)
 435 {
 436     return (!!fe->image);
 437 }
 438
 439 static void teardown_backing_store(frontend *fe)
 440 {
 441     cairo_surface_destroy(fe->image);
 442 #ifndef USE_CAIRO_WITHOUT_PIXMAP
 443     gdk_pixmap_unref(fe->pixmap);
 444 #endif
 445     fe->image = NULL;
 446 }
 447
 448 #endif
 449
 450 /* ----------------------------------------------------------------------
 451  * GDK drawing functions.
 452  */
 453
 454 #ifndef USE_CAIRO
 455
 456 static void setup_drawing(frontend *fe)
 457 {
 458     fe->gc = gdk_gc_new(fe->area->window);
 459 }
 460
 461 static void teardown_drawing(frontend *fe)
 462 {
 463     gdk_gc_unref(fe->gc);
 464     fe->gc = NULL;
 465 }
 466
 467 static void snaffle_colours(frontend *fe)
 468 {
 469     int i, ncolours;
 470     float *colours;
 471     gboolean *success;
 472
 473     fe->colmap = gdk_colormap_get_system();
 474     colours = midend_colours(fe->me, &ncolours);
 475     fe->ncolours = ncolours;
 476     fe->colours = snewn(ncolours, GdkColor);
 477     for (i = 0; i < ncolours; i++) {
 478         fe->colours[i].red = colours[i*3] * 0xFFFF;
 479         fe->colours[i].green = colours[i*3+1] * 0xFFFF;
 480         fe->colours[i].blue = colours[i*3+2] * 0xFFFF;
 481     }
 482     success = snewn(ncolours, gboolean);
 483     gdk_colormap_alloc_colors(fe->colmap, fe->colours, ncolours,
 484                               FALSE, FALSE, success);
 485     for (i = 0; i < ncolours; i++) {
 486         if (!success[i]) {
 487             g_error("couldn't allocate colour %d (#%02x%02x%02x)\n",
 488                     i, fe->colours[i].red >> 8,
 489                     fe->colours[i].green >> 8,
 490                     fe->colours[i].blue >> 8);
 491         }
 492     }
 493 }
 494
 495 static void set_window_background(frontend *fe, int colour)
 496 {
 497     fe->backgroundindex = colour;
 498     gdk_window_set_background(fe->area->window, &fe->colours[colour]);
 499     gdk_window_set_background(fe->window->window, &fe->colours[colour]);
 500 }
 501
 502 static void set_colour(frontend *fe, int colour)
 503 {
 504     gdk_gc_set_foreground(fe->gc, &fe->colours[colour]);
 505 }
 506
 507 #ifdef USE_PANGO
 508 static PangoLayout *make_pango_layout(frontend *fe)
 509 {
 510     return (pango_layout_new(gtk_widget_get_pango_context(fe->area)));
 511 }
 512
 513 static void draw_pango_layout(frontend *fe, PangoLayout *layout,
 514                               int x, int y)
 515 {
 516     gdk_draw_layout(fe->pixmap, fe->gc, x, y, layout);
 517 }
 518 #endif
 519
 520 static void save_screenshot_png(frontend *fe, const char *screenshot_file)
 521 {
 522     GdkPixbuf *pb;
 523     GError *gerror = NULL;
 524
 525     midend_redraw(fe->me);
 526
 527     pb = gdk_pixbuf_get_from_drawable(NULL, fe->pixmap,
 528                                       NULL, 0, 0, 0, 0, -1, -1);
 529     gdk_pixbuf_save(pb, screenshot_file, "png", &gerror, NULL);
 530 }
 531
 532 static void do_clip(frontend *fe, int x, int y, int w, int h)
 533 {
 534     GdkRectangle rect;
 535
 536     rect.x = x;
 537     rect.y = y;
 538     rect.width = w;
 539     rect.height = h;
 540     gdk_gc_set_clip_rectangle(fe->gc, &rect);
 541 }
 542
 543 static void do_unclip(frontend *fe)
 544 {
 545     GdkRectangle rect;
 546
 547     rect.x = 0;
 548     rect.y = 0;
 549     rect.width = fe->w;
 550     rect.height = fe->h;
 551     gdk_gc_set_clip_rectangle(fe->gc, &rect);
 552 }
 553
 554 static void do_draw_rect(frontend *fe, int x, int y, int w, int h)
 555 {
 556     gdk_draw_rectangle(fe->pixmap, fe->gc, 1, x, y, w, h);
 557 }
 558
 559 static void do_draw_line(frontend *fe, int x1, int y1, int x2, int y2)
 560 {
 561     gdk_draw_line(fe->pixmap, fe->gc, x1, y1, x2, y2);
 562 }
 563
 564 static void do_draw_thick_line(frontend *fe, float thickness,
 565                                float x1, float y1, float x2, float y2)
 566 {
 567     GdkGCValues save;
 568
 569     gdk_gc_get_values(fe->gc, &save);
 570     gdk_gc_set_line_attributes(fe->gc,
 571                                thickness,
 572                                GDK_LINE_SOLID,
 573                                GDK_CAP_BUTT,
 574                                GDK_JOIN_BEVEL);
 575     gdk_draw_line(fe->pixmap, fe->gc, x1, y1, x2, y2);
 576     gdk_gc_set_line_attributes(fe->gc,
 577                                save.line_width,
 578                                save.line_style,
 579                                save.cap_style,
 580                                save.join_style);
 581 }
 582
 583 static void do_draw_poly(frontend *fe, int *coords, int npoints,
 584                          int fillcolour, int outlinecolour)
 585 {
 586     GdkPoint *points = snewn(npoints, GdkPoint);
 587     int i;
 588
 589     for (i = 0; i < npoints; i++) {
 590         points[i].x = coords[i*2];
 591         points[i].y = coords[i*2+1];
 592     }
 593
 594     if (fillcolour >= 0) {
 595         set_colour(fe, fillcolour);
 596         gdk_draw_polygon(fe->pixmap, fe->gc, TRUE, points, npoints);
 597     }
 598     assert(outlinecolour >= 0);
 599     set_colour(fe, outlinecolour);
 600
 601     /*
 602      * In principle we ought to be able to use gdk_draw_polygon for
 603      * the outline as well. In fact, it turns out to interact badly
 604      * with a clipping region, for no terribly obvious reason, so I
 605      * draw the outline as a sequence of lines instead.
 606      */
 607     for (i = 0; i < npoints; i++)
 608         gdk_draw_line(fe->pixmap, fe->gc,
 609                       points[i].x, points[i].y,
 610                       points[(i+1)%npoints].x, points[(i+1)%npoints].y);
 611
 612     sfree(points);
 613 }
 614
 615 static void do_draw_circle(frontend *fe, int cx, int cy, int radius,
 616                            int fillcolour, int outlinecolour)
 617 {
 618     if (fillcolour >= 0) {
 619         set_colour(fe, fillcolour);
 620         gdk_draw_arc(fe->pixmap, fe->gc, TRUE,
 621                      cx - radius, cy - radius,
 622                      2 * radius, 2 * radius, 0, 360 * 64);
 623     }
 624
 625     assert(outlinecolour >= 0);
 626     set_colour(fe, outlinecolour);
 627     gdk_draw_arc(fe->pixmap, fe->gc, FALSE,
 628                  cx - radius, cy - radius,
 629                  2 * radius, 2 * radius, 0, 360 * 64);
 630 }
 631
 632 static void setup_blitter(blitter *bl, int w, int h)
 633 {
 634     /*
 635      * We can't create the pixmap right now, because fe->window
 636      * might not yet exist. So we just cache w and h and create it
 637      * during the firs call to blitter_save.
 638      */
 639     bl->pixmap = NULL;
 640 }
 641
 642 static void teardown_blitter(blitter *bl)
 643 {
 644     if (bl->pixmap)
 645         gdk_pixmap_unref(bl->pixmap);
 646 }
 647
 648 static void do_blitter_save(frontend *fe, blitter *bl, int x, int y)
 649 {
 650     if (!bl->pixmap)
 651         bl->pixmap = gdk_pixmap_new(fe->area->window, bl->w, bl->h, -1);
 652     gdk_draw_pixmap(bl->pixmap,
 653                     fe->area->style->fg_gc[GTK_WIDGET_STATE(fe->area)],
 654                     fe->pixmap,
 655                     x, y, 0, 0, bl->w, bl->h);
 656 }
 657
 658 static void do_blitter_load(frontend *fe, blitter *bl, int x, int y)
 659 {
 660     assert(bl->pixmap);
 661     gdk_draw_pixmap(fe->pixmap,
 662                     fe->area->style->fg_gc[GTK_WIDGET_STATE(fe->area)],
 663                     bl->pixmap,
 664                     0, 0, x, y, bl->w, bl->h);
 665 }
 666
 667 static void clear_backing_store(frontend *fe)
 668 {
 669     fe->pixmap = NULL;
 670 }
 671
 672 static void setup_backing_store(frontend *fe)
 673 {
 674     GdkGC *gc;
 675
 676     fe->pixmap = gdk_pixmap_new(fe->area->window, fe->pw, fe->ph, -1);
 677
 678     gc = gdk_gc_new(fe->area->window);
 679     gdk_gc_set_foreground(gc, &fe->colours[0]);
 680     gdk_draw_rectangle(fe->pixmap, gc, 1, 0, 0, fe->pw, fe->ph);
 681     gdk_draw_rectangle(fe->area->window, gc, 1, 0, 0, fe->w, fe->h);
 682     gdk_gc_unref(gc);
 683 }
 684
 685 static int backing_store_ok(frontend *fe)
 686 {
 687     return (!!fe->pixmap);
 688 }
 689
 690 static void teardown_backing_store(frontend *fe)
 691 {
 692     gdk_pixmap_unref(fe->pixmap);
 693     fe->pixmap = NULL;
 694 }
 695
 696 #endif
 697
 698 #ifndef USE_CAIRO_WITHOUT_PIXMAP
 699 static void repaint_rectangle(frontend *fe, GtkWidget *widget,
 700                               int x, int y, int w, int h)
 701 {
 702     GdkGC *gc = gdk_gc_new(gtk_widget_get_window(widget));
 703 #ifdef USE_CAIRO
 704     gdk_gc_set_foreground(gc, &fe->background);
 705 #else
 706     gdk_gc_set_foreground(gc, &fe->colours[fe->backgroundindex]);
 707 #endif
 708     if (x < fe->ox) {
 709         gdk_draw_rectangle(gtk_widget_get_window(widget), gc,
 710                            TRUE, x, y, fe->ox - x, h);
 711         w -= (fe->ox - x);
 712         x = fe->ox;
 713     }
 714     if (y < fe->oy) {
 715         gdk_draw_rectangle(gtk_widget_get_window(widget), gc,
 716                            TRUE, x, y, w, fe->oy - y);
 717         h -= (fe->oy - y);
 718         y = fe->oy;
 719     }
 720     if (w > fe->pw) {
 721         gdk_draw_rectangle(gtk_widget_get_window(widget), gc,
 722                            TRUE, x + fe->pw, y, w - fe->pw, h);
 723         w = fe->pw;
 724     }
 725     if (h > fe->ph) {
 726         gdk_draw_rectangle(gtk_widget_get_window(widget), gc,
 727                            TRUE, x, y + fe->ph, w, h - fe->ph);
 728         h = fe->ph;
 729     }
 730     gdk_draw_pixmap(gtk_widget_get_window(widget), gc, fe->pixmap,
 731                     x - fe->ox, y - fe->oy, x, y, w, h);
 732     gdk_gc_unref(gc);
 733 }
 734 #endif
 735
 736 /* ----------------------------------------------------------------------
 737  * Pango font functions.
 738  */
 739
 740 #ifdef USE_PANGO
 741
 742 static void add_font(frontend *fe, int index, int fonttype, int fontsize)
 743 {
 744     /*
 745      * Use Pango to find the closest match to the requested
 746      * font.
 747      */
 748     PangoFontDescription *fd;
 749
 750     fd = pango_font_description_new();
 751     /* `Monospace' and `Sans' are meta-families guaranteed to exist */
 752     pango_font_description_set_family(fd, fonttype == FONT_FIXED ?
 753                                       "Monospace" : "Sans");
 754     pango_font_description_set_weight(fd, PANGO_WEIGHT_BOLD);
 755     /*
 756      * I found some online Pango documentation which
 757      * described a function called
 758      * pango_font_description_set_absolute_size(), which is
 759      * _exactly_ what I want here. Unfortunately, none of
 760      * my local Pango installations have it (presumably
 761      * they're too old), so I'm going to have to hack round
 762      * it by figuring out the point size myself. This
 763      * limits me to X and probably also breaks in later
 764      * Pango installations, so ideally I should add another
 765      * CHECK_VERSION type ifdef and use set_absolute_size
 766      * where available. All very annoying.
 767      */
 768 #ifdef HAVE_SENSIBLE_ABSOLUTE_SIZE_FUNCTION
 769     pango_font_description_set_absolute_size(fd, PANGO_SCALE*fontsize);
 770 #else
 771     {
 772         Display *d = GDK_DISPLAY();
 773         int s = DefaultScreen(d);
 774         double resolution =
 775             (PANGO_SCALE * 72.27 / 25.4) *
 776             ((double) DisplayWidthMM(d, s) / DisplayWidth (d, s));
 777         pango_font_description_set_size(fd, resolution * fontsize);
 778     }
 779 #endif
 780     fe->fonts[index].desc = fd;
 781 }
 782
 783 static void align_and_draw_text(frontend *fe,
 784                                 int index, int align, int x, int y,
 785                                 const char *text)
 786 {
 787     PangoLayout *layout;
 788     PangoRectangle rect;
 789
 790     layout = make_pango_layout(fe);
 791
 792     /*
 793      * Create a layout.
 794      */
 795     pango_layout_set_font_description(layout, fe->fonts[index].desc);
 796     pango_layout_set_text(layout, text, strlen(text));
 797     pango_layout_get_pixel_extents(layout, NULL, &rect);
 798
 799     if (align & ALIGN_VCENTRE)
 800         rect.y -= rect.height / 2;
 801     else
 802         rect.y -= rect.height;
 803
 804     if (align & ALIGN_HCENTRE)
 805         rect.x -= rect.width / 2;
 806     else if (align & ALIGN_HRIGHT)
 807         rect.x -= rect.width;
 808
 809     draw_pango_layout(fe, layout, rect.x + x, rect.y + y);
 810
 811     g_object_unref(layout);
 812 }
 813
 814 #endif
 815
 816 /* ----------------------------------------------------------------------
 817  * Old-fashioned font functions.
 818  */
 819
 820 #ifndef USE_PANGO
 821
 822 static void add_font(int index, int fonttype, int fontsize)
 823 {
 824     /*
 825      * In GTK 1.2, I don't know of any plausible way to
 826      * pick a suitable font, so I'm just going to be
 827      * tedious.
 828      */
 829     fe->fonts[i].font = gdk_font_load(fonttype == FONT_FIXED ?
 830                                       "fixed" : "variable");
 831 }
 832
 833 static void align_and_draw_text(int index, int align, int x, int y,
 834                                 const char *text)
 835 {
 836     int lb, rb, wid, asc, desc;
 837
 838     /*
 839      * Measure vertical string extents with respect to the same
 840      * string always...
 841      */
 842     gdk_string_extents(fe->fonts[i].font,
 843                        "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
 844                        &lb, &rb, &wid, &asc, &desc);
 845     if (align & ALIGN_VCENTRE)
 846         y += asc - (asc+desc)/2;
 847     else
 848         y += asc;
 849
 850     /*
 851      * ... but horizontal extents with respect to the provided
 852      * string. This means that multiple pieces of text centred
 853      * on the same y-coordinate don't have different baselines.
 854      */
 855     gdk_string_extents(fe->fonts[i].font, text,
 856                        &lb, &rb, &wid, &asc, &desc);
 857
 858     if (align & ALIGN_HCENTRE)
 859         x -= wid / 2;
 860     else if (align & ALIGN_HRIGHT)
 861         x -= wid;
 862
 863     /*
 864      * Actually draw the text.
 865      */
 866     gdk_draw_string(fe->pixmap, fe->fonts[i].font, fe->gc, x, y, text);
 867 }
 868
 869 #endif
 870
 871 /* ----------------------------------------------------------------------
 872  * The exported drawing functions.
 873  */
 874
 875 void gtk_start_draw(void *handle)
 876 {
 877     frontend *fe = (frontend *)handle;
 878     fe->bbox_l = fe->w;
 879     fe->bbox_r = 0;
 880     fe->bbox_u = fe->h;
 881     fe->bbox_d = 0;
 882     setup_drawing(fe);
 883 }
 884
 885 void gtk_clip(void *handle, int x, int y, int w, int h)
 886 {
 887     frontend *fe = (frontend *)handle;
 888     do_clip(fe, x, y, w, h);
 889 }
 890
 891 void gtk_unclip(void *handle)
 892 {
 893     frontend *fe = (frontend *)handle;
 894     do_unclip(fe);
 895 }
 896
 897 void gtk_draw_text(void *handle, int x, int y, int fonttype, int fontsize,
 898                    int align, int colour, char *text)
 899 {
 900     frontend *fe = (frontend *)handle;
 901     int i;
 902
 903     /*
 904      * Find or create the font.
 905      */
 906     for (i = 0; i < fe->nfonts; i++)
 907         if (fe->fonts[i].type == fonttype && fe->fonts[i].size == fontsize)
 908             break;
 909
 910     if (i == fe->nfonts) {
 911         if (fe->fontsize <= fe->nfonts) {
 912             fe->fontsize = fe->nfonts + 10;
 913             fe->fonts = sresize(fe->fonts, fe->fontsize, struct font);
 914         }
 915
 916         fe->nfonts++;
 917
 918         fe->fonts[i].type = fonttype;
 919         fe->fonts[i].size = fontsize;
 920         add_font(fe, i, fonttype, fontsize);
 921     }
 922
 923     /*
 924      * Do the job.
 925      */
 926     set_colour(fe, colour);
 927     align_and_draw_text(fe, i, align, x, y, text);
 928 }
 929
 930 void gtk_draw_rect(void *handle, int x, int y, int w, int h, int colour)
 931 {
 932     frontend *fe = (frontend *)handle;
 933     set_colour(fe, colour);
 934     do_draw_rect(fe, x, y, w, h);
 935 }
 936
 937 void gtk_draw_line(void *handle, int x1, int y1, int x2, int y2, int colour)
 938 {
 939     frontend *fe = (frontend *)handle;
 940     set_colour(fe, colour);
 941     do_draw_line(fe, x1, y1, x2, y2);
 942 }
 943
 944 void gtk_draw_thick_line(void *handle, float thickness,
 945                          float x1, float y1, float x2, float y2, int colour)
 946 {
 947     frontend *fe = (frontend *)handle;
 948     set_colour(fe, colour);
 949     do_draw_thick_line(fe, thickness, x1, y1, x2, y2);
 950 }
 951
 952 void gtk_draw_poly(void *handle, int *coords, int npoints,
 953                    int fillcolour, int outlinecolour)
 954 {
 955     frontend *fe = (frontend *)handle;
 956     do_draw_poly(fe, coords, npoints, fillcolour, outlinecolour);
 957 }
 958
 959 void gtk_draw_circle(void *handle, int cx, int cy, int radius,
 960                      int fillcolour, int outlinecolour)
 961 {
 962     frontend *fe = (frontend *)handle;
 963     do_draw_circle(fe, cx, cy, radius, fillcolour, outlinecolour);
 964 }
 965
 966 blitter *gtk_blitter_new(void *handle, int w, int h)
 967 {
 968     blitter *bl = snew(blitter);
 969     setup_blitter(bl, w, h);
 970     bl->w = w;
 971     bl->h = h;
 972     return bl;
 973 }
 974
 975 void gtk_blitter_free(void *handle, blitter *bl)
 976 {
 977     teardown_blitter(bl);
 978     sfree(bl);
 979 }
 980
 981 void gtk_blitter_save(void *handle, blitter *bl, int x, int y)
 982 {
 983     frontend *fe = (frontend *)handle;
 984     do_blitter_save(fe, bl, x, y);
 985     bl->x = x;
 986     bl->y = y;
 987 }
 988
 989 void gtk_blitter_load(void *handle, blitter *bl, int x, int y)
 990 {
 991     frontend *fe = (frontend *)handle;
 992     if (x == BLITTER_FROMSAVED && y == BLITTER_FROMSAVED) {
 993         x = bl->x;
 994         y = bl->y;
 995     }
 996     do_blitter_load(fe, bl, x, y);
 997 }
 998
 999 void gtk_draw_update(void *handle, int x, int y, int w, int h)
1000 {
1001     frontend *fe = (frontend *)handle;
1002     if (fe->bbox_l > x  ) fe->bbox_l = x  ;
1003     if (fe->bbox_r < x+w) fe->bbox_r = x+w;
1004     if (fe->bbox_u > y  ) fe->bbox_u = y  ;
1005     if (fe->bbox_d < y+h) fe->bbox_d = y+h;
1006 }
1007
1008 void gtk_end_draw(void *handle)
1009 {
1010     frontend *fe = (frontend *)handle;
1011
1012     teardown_drawing(fe);
1013
1014     if (fe->bbox_l < fe->bbox_r && fe->bbox_u < fe->bbox_d) {
1015 #ifdef USE_CAIRO_WITHOUT_PIXMAP
1016         gtk_widget_queue_draw_area(fe->area,
1017                                    fe->bbox_l - 1 + fe->ox,
1018                                    fe->bbox_u - 1 + fe->oy,
1019                                    fe->bbox_r - fe->bbox_l + 2,
1020                                    fe->bbox_d - fe->bbox_u + 2);
1021 #else
1022         repaint_rectangle(fe, fe->area,
1023                           fe->bbox_l - 1 + fe->ox,
1024                           fe->bbox_u - 1 + fe->oy,
1025                           fe->bbox_r - fe->bbox_l + 2,
1026                           fe->bbox_d - fe->bbox_u + 2);
1027 #endif
1028     }
1029 }
1030
1031 #ifdef USE_PANGO
1032 char *gtk_text_fallback(void *handle, const char *const *strings, int nstrings)
1033 {
1034     /*
1035      * We assume Pango can cope with any UTF-8 likely to be emitted
1036      * by a puzzle.
1037      */
1038     return dupstr(strings[0]);
1039 }
1040 #endif
1041
1042 const struct drawing_api gtk_drawing = {
1043     gtk_draw_text,
1044     gtk_draw_rect,
1045     gtk_draw_line,
1046     gtk_draw_poly,
1047     gtk_draw_circle,
1048     gtk_draw_update,
1049     gtk_clip,
1050     gtk_unclip,
1051     gtk_start_draw,
1052     gtk_end_draw,
1053     gtk_status_bar,
1054     gtk_blitter_new,
1055     gtk_blitter_free,
1056     gtk_blitter_save,
1057     gtk_blitter_load,
1058     NULL, NULL, NULL, NULL, NULL, NULL, /* {begin,end}_{doc,page,puzzle} */
1059     NULL, NULL,                        /* line_width, line_dotted */
1060 #ifdef USE_PANGO
1061     gtk_text_fallback,
1062 #else
1063     NULL,
1064 #endif
1065 #ifdef NO_THICK_LINE
1066     NULL,
1067 #else
1068     gtk_draw_thick_line,
1069 #endif
1070 };
1071
1072 static void destroy(GtkWidget *widget, gpointer data)
1073 {
1074     frontend *fe = (frontend *)data;
1075     deactivate_timer(fe);
1076     midend_free(fe->me);
1077     gtk_main_quit();
1078 }
1079
1080 static gint key_event(GtkWidget *widget, GdkEventKey *event, gpointer data)
1081 {
1082     frontend *fe = (frontend *)data;
1083     int keyval;
1084     int shift = (event->state & GDK_SHIFT_MASK) ? MOD_SHFT : 0;
1085     int ctrl = (event->state & GDK_CONTROL_MASK) ? MOD_CTRL : 0;
1086
1087     if (!backing_store_ok(fe))
1088         return TRUE;
1089
1090 #if !GTK_CHECK_VERSION(2,0,0)
1091     /* Gtk 1.2 passes a key event to this function even if it's also
1092      * defined as an accelerator.
1093      * Gtk 2 doesn't do this, and this function appears not to exist there. */
1094     if (fe->accelgroup &&
1095         gtk_accel_group_get_entry(fe->accelgroup,
1096         event->keyval, event->state))
1097         return TRUE;
1098 #endif
1099
1100     /* Handle mnemonics. */
1101     if (gtk_window_activate_key(GTK_WINDOW(fe->window), event))
1102         return TRUE;
1103
1104     if (event->keyval == GDK_KEY_Up)
1105         keyval = shift | ctrl | CURSOR_UP;
1106     else if (event->keyval == GDK_KEY_KP_Up ||
1107              event->keyval == GDK_KEY_KP_8)
1108         keyval = MOD_NUM_KEYPAD | '8';
1109     else if (event->keyval == GDK_KEY_Down)
1110         keyval = shift | ctrl | CURSOR_DOWN;
1111     else if (event->keyval == GDK_KEY_KP_Down ||
1112              event->keyval == GDK_KEY_KP_2)
1113         keyval = MOD_NUM_KEYPAD | '2';
1114     else if (event->keyval == GDK_KEY_Left)
1115         keyval = shift | ctrl | CURSOR_LEFT;
1116     else if (event->keyval == GDK_KEY_KP_Left ||
1117              event->keyval == GDK_KEY_KP_4)
1118         keyval = MOD_NUM_KEYPAD | '4';
1119     else if (event->keyval == GDK_KEY_Right)
1120         keyval = shift | ctrl | CURSOR_RIGHT;
1121     else if (event->keyval == GDK_KEY_KP_Right ||
1122              event->keyval == GDK_KEY_KP_6)
1123         keyval = MOD_NUM_KEYPAD | '6';
1124     else if (event->keyval == GDK_KEY_KP_Home ||
1125              event->keyval == GDK_KEY_KP_7)
1126         keyval = MOD_NUM_KEYPAD | '7';
1127     else if (event->keyval == GDK_KEY_KP_End ||
1128              event->keyval == GDK_KEY_KP_1)
1129         keyval = MOD_NUM_KEYPAD | '1';
1130     else if (event->keyval == GDK_KEY_KP_Page_Up ||
1131              event->keyval == GDK_KEY_KP_9)
1132         keyval = MOD_NUM_KEYPAD | '9';
1133     else if (event->keyval == GDK_KEY_KP_Page_Down ||
1134              event->keyval == GDK_KEY_KP_3)
1135         keyval = MOD_NUM_KEYPAD | '3';
1136     else if (event->keyval == GDK_KEY_KP_Insert ||
1137              event->keyval == GDK_KEY_KP_0)
1138         keyval = MOD_NUM_KEYPAD | '0';
1139     else if (event->keyval == GDK_KEY_KP_Begin ||
1140              event->keyval == GDK_KEY_KP_5)
1141         keyval = MOD_NUM_KEYPAD | '5';
1142     else if (event->keyval == GDK_KEY_BackSpace ||
1143              event->keyval == GDK_KEY_Delete ||
1144              event->keyval == GDK_KEY_KP_Delete)
1145         keyval = '\177';
1146     else if (event->string[0] && !event->string[1])
1147         keyval = (unsigned char)event->string[0];
1148     else
1149         keyval = -1;
1150
1151     if (keyval >= 0 &&
1152         !midend_process_key(fe->me, 0, 0, keyval))
1153         gtk_widget_destroy(fe->window);
1154
1155     return TRUE;
1156 }
1157
1158 static gint button_event(GtkWidget *widget, GdkEventButton *event,
1159                          gpointer data)
1160 {
1161     frontend *fe = (frontend *)data;
1162     int button;
1163
1164     if (!backing_store_ok(fe))
1165         return TRUE;
1166
1167     if (event->type != GDK_BUTTON_PRESS && event->type != GDK_BUTTON_RELEASE)
1168         return TRUE;
1169
1170     if (event->button == 2 || (event->state & GDK_SHIFT_MASK))
1171         button = MIDDLE_BUTTON;
1172     else if (event->button == 3 || (event->state & GDK_MOD1_MASK))
1173         button = RIGHT_BUTTON;
1174     else if (event->button == 1)
1175         button = LEFT_BUTTON;
1176     else
1177         return FALSE;                  /* don't even know what button! */
1178
1179     if (event->type == GDK_BUTTON_RELEASE)
1180         button += LEFT_RELEASE - LEFT_BUTTON;
1181
1182     if (!midend_process_key(fe->me, event->x - fe->ox,
1183                             event->y - fe->oy, button))
1184         gtk_widget_destroy(fe->window);
1185
1186     return TRUE;
1187 }
1188
1189 static gint motion_event(GtkWidget *widget, GdkEventMotion *event,
1190                          gpointer data)
1191 {
1192     frontend *fe = (frontend *)data;
1193     int button;
1194
1195     if (!backing_store_ok(fe))
1196         return TRUE;
1197
1198     if (event->state & (GDK_BUTTON2_MASK | GDK_SHIFT_MASK))
1199         button = MIDDLE_DRAG;
1200     else if (event->state & GDK_BUTTON1_MASK)
1201         button = LEFT_DRAG;
1202     else if (event->state & GDK_BUTTON3_MASK)
1203         button = RIGHT_DRAG;
1204     else
1205         return FALSE;                  /* don't even know what button! */
1206
1207     if (!midend_process_key(fe->me, event->x - fe->ox,
1208                             event->y - fe->oy, button))
1209         gtk_widget_destroy(fe->window);
1210 #if GTK_CHECK_VERSION(2,12,0)
1211     gdk_event_request_motions(event);
1212 #else
1213     gdk_window_get_pointer(gtk_widget_get_window(widget), NULL, NULL, NULL);
1214 #endif
1215
1216     return TRUE;
1217 }
1218
1219 #if GTK_CHECK_VERSION(3,0,0)
1220 static gint draw_area(GtkWidget *widget, cairo_t *cr, gpointer data)
1221 {
1222     frontend *fe = (frontend *)data;
1223     GdkRectangle dirtyrect;
1224
1225     gdk_cairo_get_clip_rectangle(cr, &dirtyrect);
1226     cairo_set_source_surface(cr, fe->image, fe->ox, fe->oy);
1227     cairo_rectangle(cr, dirtyrect.x, dirtyrect.y,
1228                     dirtyrect.width, dirtyrect.height);
1229     cairo_fill(cr);
1230
1231     return TRUE;
1232 }
1233 #else
1234 static gint expose_area(GtkWidget *widget, GdkEventExpose *event,
1235                         gpointer data)
1236 {
1237     frontend *fe = (frontend *)data;
1238
1239     if (backing_store_ok(fe)) {
1240 #ifdef USE_CAIRO_WITHOUT_PIXMAP
1241         cairo_t *cr = gdk_cairo_create(gtk_widget_get_window(widget));
1242         cairo_set_source_surface(cr, fe->image, fe->ox, fe->oy);
1243         cairo_rectangle(cr, event->area.x, event->area.y,
1244                         event->area.width, event->area.height);
1245         cairo_fill(cr);
1246         cairo_destroy(cr);
1247 #else
1248         repaint_rectangle(fe, widget,
1249                           event->area.x, event->area.y,
1250                           event->area.width, event->area.height);
1251 #endif
1252     }
1253     return TRUE;
1254 }
1255 #endif
1256
1257 static gint map_window(GtkWidget *widget, GdkEvent *event,
1258                        gpointer data)
1259 {
1260     frontend *fe = (frontend *)data;
1261
1262     /*
1263      * Apparently we need to do this because otherwise the status
1264      * bar will fail to update immediately. Annoying, but there we
1265      * go.
1266      */
1267     gtk_widget_queue_draw(fe->window);
1268
1269     return TRUE;
1270 }
1271
1272 static gint configure_area(GtkWidget *widget,
1273                            GdkEventConfigure *event, gpointer data)
1274 {
1275     frontend *fe = (frontend *)data;
1276     int x, y;
1277
1278     x = event->width;
1279     y = event->height;
1280
1281     if (x != fe->w || y != fe->h || !backing_store_ok(fe)) {
1282         if (backing_store_ok(fe))
1283             teardown_backing_store(fe);
1284
1285         fe->w = x;
1286         fe->h = y;
1287         midend_size(fe->me, &x, &y, TRUE);
1288         fe->pw = x;
1289         fe->ph = y;
1290         fe->ox = (fe->w - fe->pw) / 2;
1291         fe->oy = (fe->h - fe->ph) / 2;
1292
1293         setup_backing_store(fe);
1294     }
1295
1296     midend_force_redraw(fe->me);
1297
1298     return TRUE;
1299 }
1300
1301 static gint timer_func(gpointer data)
1302 {
1303     frontend *fe = (frontend *)data;
1304
1305     if (fe->timer_active) {
1306         struct timeval now;
1307         float elapsed;
1308         gettimeofday(&now, NULL);
1309         elapsed = ((now.tv_usec - fe->last_time.tv_usec) * 0.000001F +
1310                    (now.tv_sec - fe->last_time.tv_sec));
1311         midend_timer(fe->me, elapsed);  /* may clear timer_active */
1312         fe->last_time = now;
1313     }
1314
1315     return fe->timer_active;
1316 }
1317
1318 void deactivate_timer(frontend *fe)
1319 {
1320     if (!fe)
1321         return;                        /* can happen due to --generate */
1322     if (fe->timer_active)
1323         g_source_remove(fe->timer_id);
1324     fe->timer_active = FALSE;
1325 }
1326
1327 void activate_timer(frontend *fe)
1328 {
1329     if (!fe)
1330         return;                        /* can happen due to --generate */
1331     if (!fe->timer_active) {
1332         fe->timer_id = g_timeout_add(20, timer_func, fe);
1333         gettimeofday(&fe->last_time, NULL);
1334     }
1335     fe->timer_active = TRUE;
1336 }
1337
1338 static void window_destroy(GtkWidget *widget, gpointer data)
1339 {
1340     gtk_main_quit();
1341 }
1342
1343 static void msgbox_button_clicked(GtkButton *button, gpointer data)
1344 {
1345     GtkWidget *window = GTK_WIDGET(data);
1346     int v, *ip;
1347
1348     ip = (int *)g_object_get_data(G_OBJECT(window), "user-data");
1349     v = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(button), "user-data"));
1350     *ip = v;
1351
1352     gtk_widget_destroy(GTK_WIDGET(data));
1353 }
1354
1355 static int win_key_press(GtkWidget *widget, GdkEventKey *event, gpointer data)
1356 {
1357     GObject *cancelbutton = G_OBJECT(data);
1358
1359     /*
1360      * `Escape' effectively clicks the cancel button
1361      */
1362     if (event->keyval == GDK_KEY_Escape) {
1363         g_signal_emit_by_name(cancelbutton, "clicked");
1364         return TRUE;
1365     }
1366
1367     return FALSE;
1368 }
1369
1370 enum { MB_OK, MB_YESNO };
1371
1372 int message_box(GtkWidget *parent, char *title, char *msg, int centre,
1373                 int type)
1374 {
1375     GtkWidget *window, *hbox, *text, *button;
1376     char *titles;
1377     int i, def, cancel;
1378
1379     window = gtk_dialog_new();
1380     text = gtk_label_new(msg);
1381     gtk_misc_set_alignment(GTK_MISC(text), 0.0, 0.0);
1382     hbox = gtk_hbox_new(FALSE, 0);
1383     gtk_box_pack_start(GTK_BOX(hbox), text, FALSE, FALSE, 20);
1384     gtk_box_pack_start
1385         (GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(window))),
1386          hbox, FALSE, FALSE, 20);
1387     gtk_widget_show(text);
1388     gtk_widget_show(hbox);
1389     gtk_window_set_title(GTK_WINDOW(window), title);
1390     gtk_label_set_line_wrap(GTK_LABEL(text), TRUE);
1391
1392     if (type == MB_OK) {
1393         titles = GTK_STOCK_OK "\0";
1394         def = cancel = 0;
1395     } else {
1396         assert(type == MB_YESNO);
1397         titles = GTK_STOCK_NO "\0" GTK_STOCK_YES "\0";
1398         def = 1;
1399         cancel = 0;
1400     }
1401     i = 0;
1402
1403     while (*titles) {
1404         button = gtk_button_new_from_stock(titles);
1405         gtk_box_pack_end
1406             (GTK_BOX(gtk_dialog_get_action_area(GTK_DIALOG(window))),
1407              button, FALSE, FALSE, 0);
1408         gtk_widget_show(button);
1409         if (i == def) {
1410             gtk_widget_set_can_default(button, TRUE);
1411             gtk_window_set_default(GTK_WINDOW(window), button);
1412         }
1413         if (i == cancel) {
1414             g_signal_connect(G_OBJECT(window), "key_press_event",
1415                              G_CALLBACK(win_key_press), button);
1416         }
1417         g_signal_connect(G_OBJECT(button), "clicked",
1418                          G_CALLBACK(msgbox_button_clicked), window);
1419         g_object_set_data(G_OBJECT(button), "user-data",
1420                           GINT_TO_POINTER(i));
1421         titles += strlen(titles)+1;
1422         i++;
1423     }
1424     g_object_set_data(G_OBJECT(window), "user-data", &i);
1425     g_signal_connect(G_OBJECT(window), "destroy",
1426                      G_CALLBACK(window_destroy), NULL);
1427     gtk_window_set_modal(GTK_WINDOW(window), TRUE);
1428     gtk_window_set_transient_for(GTK_WINDOW(window), GTK_WINDOW(parent));
1429     /* set_transient_window_pos(parent, window); */
1430     gtk_widget_show(window);
1431     i = -1;
1432     gtk_main();
1433     return (type == MB_YESNO ? i == 1 : TRUE);
1434 }
1435
1436 void error_box(GtkWidget *parent, char *msg)
1437 {
1438     message_box(parent, "Error", msg, FALSE, MB_OK);
1439 }
1440
1441 static void config_ok_button_clicked(GtkButton *button, gpointer data)
1442 {
1443     frontend *fe = (frontend *)data;
1444     char *err;
1445
1446     err = midend_set_config(fe->me, fe->cfg_which, fe->cfg);
1447
1448     if (err)
1449         error_box(fe->cfgbox, err);
1450     else {
1451         fe->cfgret = TRUE;
1452         gtk_widget_destroy(fe->cfgbox);
1453         changed_preset(fe);
1454     }
1455 }
1456
1457 static void config_cancel_button_clicked(GtkButton *button, gpointer data)
1458 {
1459     frontend *fe = (frontend *)data;
1460
1461     gtk_widget_destroy(fe->cfgbox);
1462 }
1463
1464 static int editbox_key(GtkWidget *widget, GdkEventKey *event, gpointer data)
1465 {
1466     /*
1467      * GtkEntry has a nasty habit of eating the Return key, which
1468      * is unhelpful since it doesn't actually _do_ anything with it
1469      * (it calls gtk_widget_activate, but our edit boxes never need
1470      * activating). So I catch Return before GtkEntry sees it, and
1471      * pass it straight on to the parent widget. Effect: hitting
1472      * Return in an edit box will now activate the default button
1473      * in the dialog just like it will everywhere else.
1474      */
1475     if (event->keyval == GDK_KEY_Return &&
1476         gtk_widget_get_parent(widget) != NULL) {
1477         gint return_val;
1478         g_signal_stop_emission_by_name(G_OBJECT(widget), "key_press_event");
1479         g_signal_emit_by_name(G_OBJECT(gtk_widget_get_parent(widget)),
1480                               "key_press_event", event, &return_val);
1481         return return_val;
1482     }
1483     return FALSE;
1484 }
1485
1486 static void editbox_changed(GtkEditable *ed, gpointer data)
1487 {
1488     config_item *i = (config_item *)data;
1489
1490     sfree(i->sval);
1491     i->sval = dupstr(gtk_entry_get_text(GTK_ENTRY(ed)));
1492 }
1493
1494 static void button_toggled(GtkToggleButton *tb, gpointer data)
1495 {
1496     config_item *i = (config_item *)data;
1497
1498     i->ival = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(tb));
1499 }
1500
1501 static void droplist_sel(GtkComboBox *combo, gpointer data)
1502 {
1503     config_item *i = (config_item *)data;
1504
1505     i->ival = gtk_combo_box_get_active(combo);
1506 }
1507
1508 static int get_config(frontend *fe, int which)
1509 {
1510     GtkWidget *w, *table, *cancel;
1511     char *title;
1512     config_item *i;
1513     int y;
1514
1515     fe->cfg = midend_get_config(fe->me, which, &title);
1516     fe->cfg_which = which;
1517     fe->cfgret = FALSE;
1518
1519     fe->cfgbox = gtk_dialog_new();
1520     gtk_window_set_title(GTK_WINDOW(fe->cfgbox), title);
1521     sfree(title);
1522
1523     w = gtk_button_new_from_stock(GTK_STOCK_CANCEL);
1524     gtk_box_pack_end
1525         (GTK_BOX(gtk_dialog_get_action_area(GTK_DIALOG(fe->cfgbox))),
1526          w, FALSE, FALSE, 0);
1527     gtk_widget_show(w);
1528     g_signal_connect(G_OBJECT(w), "clicked",
1529                      G_CALLBACK(config_cancel_button_clicked), fe);
1530     cancel = w;
1531
1532     w = gtk_button_new_from_stock(GTK_STOCK_OK);
1533     gtk_box_pack_end
1534         (GTK_BOX(gtk_dialog_get_action_area(GTK_DIALOG(fe->cfgbox))),
1535          w, FALSE, FALSE, 0);
1536     gtk_widget_show(w);
1537     gtk_widget_set_can_default(w, TRUE);
1538     gtk_window_set_default(GTK_WINDOW(fe->cfgbox), w);
1539     g_signal_connect(G_OBJECT(w), "clicked",
1540                      G_CALLBACK(config_ok_button_clicked), fe);
1541
1542 #if GTK_CHECK_VERSION(3,0,0)
1543     table = gtk_grid_new();
1544 #else
1545     table = gtk_table_new(1, 2, FALSE);
1546 #endif
1547     y = 0;
1548     gtk_box_pack_start
1549         (GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(fe->cfgbox))),
1550          table, FALSE, FALSE, 0);
1551     gtk_widget_show(table);
1552
1553     for (i = fe->cfg; i->type != C_END; i++) {
1554 #if !GTK_CHECK_VERSION(3,0,0)
1555         gtk_table_resize(GTK_TABLE(table), y+1, 2);
1556 #endif
1557
1558         switch (i->type) {
1559           case C_STRING:
1560             /*
1561              * Edit box with a label beside it.
1562              */
1563
1564             w = gtk_label_new(i->name);
1565             gtk_misc_set_alignment(GTK_MISC(w), 0.0, 0.5);
1566 #if GTK_CHECK_VERSION(3,0,0)
1567             gtk_grid_attach(GTK_GRID(table), w, 0, y, 1, 1);
1568 #else
1569             gtk_table_attach(GTK_TABLE(table), w, 0, 1, y, y+1,
1570                              GTK_SHRINK | GTK_FILL,
1571                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1572                              3, 3);
1573 #endif
1574             gtk_widget_show(w);
1575
1576             w = gtk_entry_new();
1577 #if GTK_CHECK_VERSION(3,0,0)
1578             gtk_grid_attach(GTK_GRID(table), w, 1, y, 1, 1);
1579             g_object_set(G_OBJECT(w), "hexpand", TRUE, (const char *)NULL);
1580 #else
1581             gtk_table_attach(GTK_TABLE(table), w, 1, 2, y, y+1,
1582                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1583                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1584                              3, 3);
1585 #endif
1586             gtk_entry_set_text(GTK_ENTRY(w), i->sval);
1587             g_signal_connect(G_OBJECT(w), "changed",
1588                              G_CALLBACK(editbox_changed), i);
1589             g_signal_connect(G_OBJECT(w), "key_press_event",
1590                              G_CALLBACK(editbox_key), NULL);
1591             gtk_widget_show(w);
1592
1593             break;
1594
1595           case C_BOOLEAN:
1596             /*
1597              * Simple checkbox.
1598              */
1599             w = gtk_check_button_new_with_label(i->name);
1600             g_signal_connect(G_OBJECT(w), "toggled",
1601                              G_CALLBACK(button_toggled), i);
1602 #if GTK_CHECK_VERSION(3,0,0)
1603             gtk_grid_attach(GTK_GRID(table), w, 0, y, 2, 1);
1604             g_object_set(G_OBJECT(w), "hexpand", TRUE, (const char *)NULL);
1605 #else
1606             gtk_table_attach(GTK_TABLE(table), w, 0, 2, y, y+1,
1607                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1608                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1609                              3, 3);
1610 #endif
1611             gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(w), i->ival);
1612             gtk_widget_show(w);
1613             break;
1614
1615           case C_CHOICES:
1616             /*
1617              * Drop-down list (GtkComboBox).
1618              */
1619
1620             w = gtk_label_new(i->name);
1621             gtk_misc_set_alignment(GTK_MISC(w), 0.0, 0.5);
1622 #if GTK_CHECK_VERSION(3,0,0)
1623             gtk_grid_attach(GTK_GRID(table), w, 0, y, 1, 1);
1624 #else
1625             gtk_table_attach(GTK_TABLE(table), w, 0, 1, y, y+1,
1626                              GTK_SHRINK | GTK_FILL,
1627                              GTK_EXPAND | GTK_SHRINK | GTK_FILL ,
1628                              3, 3);
1629 #endif
1630             gtk_widget_show(w);
1631
1632             {
1633                 int c;
1634                 char *p, *q, *name;
1635                 GtkListStore *model;
1636                 GtkCellRenderer *cr;
1637                 GtkTreeIter iter;
1638
1639                 model = gtk_list_store_new(1, G_TYPE_STRING);
1640
1641                 c = *i->sval;
1642                 p = i->sval+1;
1643
1644                 while (*p) {
1645                     q = p;
1646                     while (*q && *q != c)
1647                         q++;
1648
1649                     name = snewn(q-p+1, char);
1650                     strncpy(name, p, q-p);
1651                     name[q-p] = '\0';
1652
1653                     if (*q) q++;       /* eat delimiter */
1654
1655                     gtk_list_store_append(model, &iter);
1656                     gtk_list_store_set(model, &iter, 0, name, -1);
1657
1658                     p = q;
1659                 }
1660
1661                 w = gtk_combo_box_new_with_model(GTK_TREE_MODEL(model));
1662
1663                 gtk_combo_box_set_active(GTK_COMBO_BOX(w), i->ival);
1664
1665                 cr = gtk_cell_renderer_text_new();
1666                 gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(w), cr, TRUE);
1667                 gtk_cell_layout_set_attributes(GTK_CELL_LAYOUT(w), cr,
1668                                                "text", 0, NULL);
1669
1670                 g_signal_connect(G_OBJECT(w), "changed",
1671                                  G_CALLBACK(droplist_sel), i);
1672             }
1673
1674 #if GTK_CHECK_VERSION(3,0,0)
1675             gtk_grid_attach(GTK_GRID(table), w, 1, y, 1, 1);
1676             g_object_set(G_OBJECT(w), "hexpand", TRUE, (const char *)NULL);
1677 #else
1678             gtk_table_attach(GTK_TABLE(table), w, 1, 2, y, y+1,
1679                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1680                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
1681                              3, 3);
1682 #endif
1683             gtk_widget_show(w);
1684             break;
1685         }
1686
1687         y++;
1688     }
1689
1690     g_signal_connect(G_OBJECT(fe->cfgbox), "destroy",
1691                      G_CALLBACK(window_destroy), NULL);
1692     g_signal_connect(G_OBJECT(fe->cfgbox), "key_press_event",
1693                      G_CALLBACK(win_key_press), cancel);
1694     gtk_window_set_modal(GTK_WINDOW(fe->cfgbox), TRUE);
1695     gtk_window_set_transient_for(GTK_WINDOW(fe->cfgbox),
1696                                  GTK_WINDOW(fe->window));
1697     /* set_transient_window_pos(fe->window, fe->cfgbox); */
1698     gtk_widget_show(fe->cfgbox);
1699     gtk_main();
1700
1701     free_cfg(fe->cfg);
1702
1703     return fe->cfgret;
1704 }
1705
1706 static void menu_key_event(GtkMenuItem *menuitem, gpointer data)
1707 {
1708     frontend *fe = (frontend *)data;
1709     int key = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(menuitem),
1710                                                 "user-data"));
1711     if (!midend_process_key(fe->me, 0, 0, key))
1712         gtk_widget_destroy(fe->window);
1713 }
1714
1715 static void get_size(frontend *fe, int *px, int *py)
1716 {
1717     int x, y;
1718
1719     /*
1720      * Currently I don't want to make the GTK port scale large
1721      * puzzles to fit on the screen. This is because X does permit
1722      * extremely large windows and many window managers provide a
1723      * means of navigating round them, and the users I consulted
1724      * before deciding said that they'd rather have enormous puzzle
1725      * windows spanning multiple screen pages than have them
1726      * shrunk. I could change my mind later or introduce
1727      * configurability; this would be the place to do so, by
1728      * replacing the initial values of x and y with the screen
1729      * dimensions.
1730      */
1731     x = INT_MAX;
1732     y = INT_MAX;
1733     midend_size(fe->me, &x, &y, FALSE);
1734     *px = x;
1735     *py = y;
1736 }
1737
1738 #if !GTK_CHECK_VERSION(2,0,0)
1739 #define gtk_window_resize(win, x, y) \
1740         gdk_window_resize(GTK_WIDGET(win)->window, x, y)
1741 #endif
1742
1743 /*
1744  * Called when any other code in this file has changed the
1745  * selected game parameters.
1746  */
1747 static void changed_preset(frontend *fe)
1748 {
1749     int n = midend_which_preset(fe->me);
1750
1751     fe->preset_threaded = TRUE;
1752     if (n < 0 && fe->preset_custom) {
1753         gtk_check_menu_item_set_active(
1754             GTK_CHECK_MENU_ITEM(fe->preset_custom),
1755             TRUE);
1756     } else {
1757         GSList *gs = fe->preset_radio;
1758         int i = fe->n_preset_menu_items - 1 - n;
1759         if (fe->preset_custom)
1760             gs = gs->next;
1761         while (i && gs) {
1762             i--;
1763             gs = gs->next;
1764         }
1765         if (gs) {
1766             gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(gs->data),
1767                                            TRUE);
1768         } else for (gs = fe->preset_radio; gs; gs = gs->next) {
1769             gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(gs->data),
1770                                            FALSE);
1771         }
1772     }
1773     fe->preset_threaded = FALSE;
1774
1775     /*
1776      * Update the greying on the Copy menu option.
1777      */
1778     if (fe->copy_menu_item) {
1779         int enabled = midend_can_format_as_text_now(fe->me);
1780         gtk_widget_set_sensitive(fe->copy_menu_item, enabled);
1781     }
1782 }
1783
1784 #if !GTK_CHECK_VERSION(3,0,0)
1785 static gboolean not_size_allocated_yet(GtkWidget *w)
1786 {
1787     /*
1788      * This function tests whether a widget has not yet taken up space
1789      * on the screen which it will occupy in future. (Therefore, it
1790      * returns true only if the widget does exist but does not have a
1791      * size allocation. A null widget is already taking up all the
1792      * space it ever will.)
1793      */
1794     if (!w)
1795         return FALSE;        /* nonexistent widgets aren't a problem */
1796
1797 #if GTK_CHECK_VERSION(2,18,0)  /* skip if no gtk_widget_get_allocation */
1798     {
1799         GtkAllocation a;
1800         gtk_widget_get_allocation(w, &a);
1801         if (a.height == 0 || a.width == 0)
1802             return TRUE;       /* widget exists but has no size yet */
1803     }
1804 #endif
1805
1806     return FALSE;
1807 }
1808
1809 static void try_shrink_drawing_area(frontend *fe)
1810 {
1811     if (fe->drawing_area_shrink_pending &&
1812         (!fe->menubar_is_local || !not_size_allocated_yet(fe->menubar)) &&
1813         !not_size_allocated_yet(fe->statusbar)) {
1814         /*
1815          * In order to permit the user to resize the window smaller as
1816          * well as bigger, we call this function after the window size
1817          * has ended up where we want it. This shouldn't shrink the
1818          * window immediately; it just arranges that the next time the
1819          * user tries to shrink it, they can.
1820          *
1821          * However, at puzzle creation time, we defer the first of
1822          * these operations until after the menu bar and status bar
1823          * are actually visible. On Ubuntu 12.04 I've found that these
1824          * can take a while to be displayed, and that it's a mistake
1825          * to reduce the drawing area's size allocation before they've
1826          * turned up or else the drawing area makes room for them by
1827          * shrinking to less than the size we intended.
1828          */
1829         gtk_drawing_area_size(GTK_DRAWING_AREA(fe->area), 1, 1);
1830         fe->drawing_area_shrink_pending = FALSE;
1831     }
1832 }
1833 #endif /* !GTK_CHECK_VERSION(3,0,0) */
1834
1835 static gint configure_window(GtkWidget *widget,
1836                              GdkEventConfigure *event, gpointer data)
1837 {
1838 #if !GTK_CHECK_VERSION(3,0,0)
1839     /*
1840      * When the main puzzle window changes size, it might be because
1841      * the menu bar or status bar has turned up after starting off
1842      * absent, in which case we should have another go at enacting a
1843      * pending shrink of the drawing area.
1844      */
1845     frontend *fe = (frontend *)data;
1846     try_shrink_drawing_area(fe);
1847 #endif
1848     return FALSE;
1849 }
1850
1851 static void resize_fe(frontend *fe)
1852 {
1853     int x, y;
1854
1855     get_size(fe, &x, &y);
1856
1857 #if GTK_CHECK_VERSION(3,0,0)
1858     gtk_window_resize_to_geometry(GTK_WINDOW(fe->window), x, y);
1859 #else
1860     fe->w = x;
1861     fe->h = y;
1862     fe->drawing_area_shrink_pending = FALSE;
1863     gtk_drawing_area_size(GTK_DRAWING_AREA(fe->area), x, y);
1864     {
1865         GtkRequisition req;
1866         gtk_widget_size_request(GTK_WIDGET(fe->window), &req);
1867         gtk_window_resize(GTK_WINDOW(fe->window), req.width, req.height);
1868     }
1869     fe->drawing_area_shrink_pending = TRUE;
1870     try_shrink_drawing_area(fe);
1871 #endif
1872 }
1873
1874 static void menu_preset_event(GtkMenuItem *menuitem, gpointer data)
1875 {
1876     frontend *fe = (frontend *)data;
1877     game_params *params =
1878         (game_params *)g_object_get_data(G_OBJECT(menuitem), "user-data");
1879
1880     if (fe->preset_threaded ||
1881         (GTK_IS_CHECK_MENU_ITEM(menuitem) &&
1882          !gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(menuitem))))
1883         return;
1884     midend_set_params(fe->me, params);
1885     midend_new_game(fe->me);
1886     changed_preset(fe);
1887     resize_fe(fe);
1888 }
1889
1890 GdkAtom compound_text_atom, utf8_string_atom;
1891 int paste_initialised = FALSE;
1892
1893 static void set_selection(frontend *fe, GdkAtom selection)
1894 {
1895     if (!paste_initialised) {
1896         compound_text_atom = gdk_atom_intern("COMPOUND_TEXT", FALSE);
1897         utf8_string_atom = gdk_atom_intern("UTF8_STRING", FALSE);
1898         paste_initialised = TRUE;
1899     }
1900
1901     /*
1902      * For this simple application we can safely assume that the
1903      * data passed to this function is pure ASCII, which means we
1904      * can return precisely the same stuff for types STRING,
1905      * COMPOUND_TEXT or UTF8_STRING.
1906      */
1907
1908     if (gtk_selection_owner_set(fe->area, selection, CurrentTime)) {
1909         gtk_selection_clear_targets(fe->area, selection);
1910         gtk_selection_add_target(fe->area, selection,
1911                                  GDK_SELECTION_TYPE_STRING, 1);
1912         gtk_selection_add_target(fe->area, selection, compound_text_atom, 1);
1913         gtk_selection_add_target(fe->area, selection, utf8_string_atom, 1);
1914     }
1915 }
1916
1917 void write_clip(frontend *fe, char *data)
1918 {
1919     if (fe->paste_data)
1920         sfree(fe->paste_data);
1921
1922     fe->paste_data = data;
1923     fe->paste_data_len = strlen(data);
1924
1925     set_selection(fe, GDK_SELECTION_PRIMARY);
1926     set_selection(fe, GDK_SELECTION_CLIPBOARD);
1927 }
1928
1929 void selection_get(GtkWidget *widget, GtkSelectionData *seldata,
1930                    guint info, guint time_stamp, gpointer data)
1931 {
1932     frontend *fe = (frontend *)data;
1933     gtk_selection_data_set(seldata, gtk_selection_data_get_target(seldata), 8,
1934                            fe->paste_data, fe->paste_data_len);
1935 }
1936
1937 gint selection_clear(GtkWidget *widget, GdkEventSelection *seldata,
1938                      gpointer data)
1939 {
1940     frontend *fe = (frontend *)data;
1941
1942     if (fe->paste_data)
1943         sfree(fe->paste_data);
1944     fe->paste_data = NULL;
1945     fe->paste_data_len = 0;
1946     return TRUE;
1947 }
1948
1949 static void menu_copy_event(GtkMenuItem *menuitem, gpointer data)
1950 {
1951     frontend *fe = (frontend *)data;
1952     char *text;
1953
1954     text = midend_text_format(fe->me);
1955
1956     if (text) {
1957         write_clip(fe, text);
1958     } else {
1959         gdk_beep();
1960     }
1961 }
1962
1963 #ifdef OLD_FILESEL
1964
1965 static void filesel_ok(GtkButton *button, gpointer data)
1966 {
1967     frontend *fe = (frontend *)data;
1968
1969     gpointer filesel = g_object_get_data(G_OBJECT(button), "user-data");
1970
1971     const char *name =
1972         gtk_file_selection_get_filename(GTK_FILE_SELECTION(filesel));
1973
1974     fe->filesel_name = dupstr(name);
1975 }
1976
1977 static char *file_selector(frontend *fe, char *title, int save)
1978 {
1979     GtkWidget *filesel =
1980         gtk_file_selection_new(title);
1981
1982     fe->filesel_name = NULL;
1983
1984     gtk_window_set_modal(GTK_WINDOW(filesel), TRUE);
1985     g_object_set_data
1986         (G_OBJECT(GTK_FILE_SELECTION(filesel)->ok_button), "user-data",
1987          (gpointer)filesel);
1988     g_signal_connect
1989         (G_OBJECT(GTK_FILE_SELECTION(filesel)->ok_button), "clicked",
1990          G_CALLBACK(filesel_ok), fe);
1991     g_signal_connect_swapped
1992         (G_OBJECT(GTK_FILE_SELECTION(filesel)->ok_button), "clicked",
1993          G_CALLBACK(gtk_widget_destroy), (gpointer)filesel);
1994     g_signal_connect_object
1995         (G_OBJECT(GTK_FILE_SELECTION(filesel)->cancel_button), "clicked",
1996          G_CALLBACK(gtk_widget_destroy), (gpointer)filesel);
1997     g_signal_connect(G_OBJECT(filesel), "destroy",
1998                      G_CALLBACK(window_destroy), NULL);
1999     gtk_widget_show(filesel);
2000     gtk_window_set_transient_for(GTK_WINDOW(filesel), GTK_WINDOW(fe->window));
2001     gtk_main();
2002
2003     return fe->filesel_name;
2004 }
2005
2006 #else
2007
2008 static char *file_selector(frontend *fe, char *title, int save)
2009 {
2010     char *filesel_name = NULL;
2011
2012     GtkWidget *filesel =
2013         gtk_file_chooser_dialog_new(title,
2014                                     GTK_WINDOW(fe->window),
2015                                     save ? GTK_FILE_CHOOSER_ACTION_SAVE :
2016                                     GTK_FILE_CHOOSER_ACTION_OPEN,
2017                                     GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
2018                                     save ? GTK_STOCK_SAVE : GTK_STOCK_OPEN,
2019                                     GTK_RESPONSE_ACCEPT,
2020                                     NULL);
2021
2022     if (gtk_dialog_run(GTK_DIALOG(filesel)) == GTK_RESPONSE_ACCEPT) {
2023         const char *name = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(filesel));
2024         filesel_name = dupstr(name);
2025     }
2026
2027     gtk_widget_destroy(filesel);
2028
2029     return filesel_name;
2030 }
2031
2032 #endif
2033
2034 struct savefile_write_ctx {
2035     FILE *fp;
2036     int error;
2037 };
2038
2039 static void savefile_write(void *wctx, void *buf, int len)
2040 {
2041     struct savefile_write_ctx *ctx = (struct savefile_write_ctx *)wctx;
2042     if (fwrite(buf, 1, len, ctx->fp) < len)
2043         ctx->error = errno;
2044 }
2045
2046 static int savefile_read(void *wctx, void *buf, int len)
2047 {
2048     FILE *fp = (FILE *)wctx;
2049     int ret;
2050
2051     ret = fread(buf, 1, len, fp);
2052     return (ret == len);
2053 }
2054
2055 static void menu_save_event(GtkMenuItem *menuitem, gpointer data)
2056 {
2057     frontend *fe = (frontend *)data;
2058     char *name;
2059
2060     name = file_selector(fe, "Enter name of game file to save", TRUE);
2061
2062     if (name) {
2063         FILE *fp;
2064
2065         if ((fp = fopen(name, "r")) != NULL) {
2066             char buf[256 + FILENAME_MAX];
2067             fclose(fp);
2068             /* file exists */
2069
2070             sprintf(buf, "Are you sure you want to overwrite the"
2071                     " file \"%.*s\"?",
2072                     FILENAME_MAX, name);
2073             if (!message_box(fe->window, "Question", buf, TRUE, MB_YESNO))
2074                 return;
2075         }
2076
2077         fp = fopen(name, "w");
2078         sfree(name);
2079
2080         if (!fp) {
2081             error_box(fe->window, "Unable to open save file");
2082             return;
2083         }
2084
2085         {
2086             struct savefile_write_ctx ctx;
2087             ctx.fp = fp;
2088             ctx.error = 0;
2089             midend_serialise(fe->me, savefile_write, &ctx);
2090             fclose(fp);
2091             if (ctx.error) {
2092                 char boxmsg[512];
2093                 sprintf(boxmsg, "Error writing save file: %.400s",
2094                         strerror(errno));
2095                 error_box(fe->window, boxmsg);
2096                 return;
2097             }
2098         }
2099
2100     }
2101 }
2102
2103 static void menu_load_event(GtkMenuItem *menuitem, gpointer data)
2104 {
2105     frontend *fe = (frontend *)data;
2106     char *name, *err;
2107
2108     name = file_selector(fe, "Enter name of saved game file to load", FALSE);
2109
2110     if (name) {
2111         FILE *fp = fopen(name, "r");
2112         sfree(name);
2113
2114         if (!fp) {
2115             error_box(fe->window, "Unable to open saved game file");
2116             return;
2117         }
2118
2119         err = midend_deserialise(fe->me, savefile_read, fp);
2120
2121         fclose(fp);
2122
2123         if (err) {
2124             error_box(fe->window, err);
2125             return;
2126         }
2127
2128         changed_preset(fe);
2129         resize_fe(fe);
2130     }
2131 }
2132
2133 static void menu_solve_event(GtkMenuItem *menuitem, gpointer data)
2134 {
2135     frontend *fe = (frontend *)data;
2136     char *msg;
2137
2138     msg = midend_solve(fe->me);
2139
2140     if (msg)
2141         error_box(fe->window, msg);
2142 }
2143
2144 static void menu_restart_event(GtkMenuItem *menuitem, gpointer data)
2145 {
2146     frontend *fe = (frontend *)data;
2147
2148     midend_restart_game(fe->me);
2149 }
2150
2151 static void menu_config_event(GtkMenuItem *menuitem, gpointer data)
2152 {
2153     frontend *fe = (frontend *)data;
2154     int which = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(menuitem),
2155                                                   "user-data"));
2156
2157     if (fe->preset_threaded ||
2158         (GTK_IS_CHECK_MENU_ITEM(menuitem) &&
2159          !gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(menuitem))))
2160         return;
2161     changed_preset(fe);                 /* Put the old preset back! */
2162     if (!get_config(fe, which))
2163         return;
2164
2165     midend_new_game(fe->me);
2166     resize_fe(fe);
2167 }
2168
2169 static void menu_about_event(GtkMenuItem *menuitem, gpointer data)
2170 {
2171     frontend *fe = (frontend *)data;
2172     char titlebuf[256];
2173     char textbuf[1024];
2174
2175     sprintf(titlebuf, "About %.200s", thegame.name);
2176     sprintf(textbuf,
2177             "%.200s\n\n"
2178             "from Simon Tatham's Portable Puzzle Collection\n\n"
2179             "%.500s", thegame.name, ver);
2180
2181     message_box(fe->window, titlebuf, textbuf, TRUE, MB_OK);
2182 }
2183
2184 static GtkWidget *add_menu_item_with_key(frontend *fe, GtkContainer *cont,
2185                                          char *text, int key)
2186 {
2187     GtkWidget *menuitem = gtk_menu_item_new_with_label(text);
2188     int keyqual;
2189     gtk_container_add(cont, menuitem);
2190     g_object_set_data(G_OBJECT(menuitem), "user-data", GINT_TO_POINTER(key));
2191     g_signal_connect(G_OBJECT(menuitem), "activate",
2192                      G_CALLBACK(menu_key_event), fe);
2193     switch (key & ~0x1F) {
2194       case 0x00:
2195         key += 0x60;
2196         keyqual = GDK_CONTROL_MASK;
2197         break;
2198       case 0x40:
2199         key += 0x20;
2200         keyqual = GDK_SHIFT_MASK;
2201         break;
2202       default:
2203         keyqual = 0;
2204         break;
2205     }
2206     gtk_widget_add_accelerator(menuitem,
2207                                "activate", fe->accelgroup,
2208                                key, keyqual,
2209                                GTK_ACCEL_VISIBLE);
2210     gtk_widget_show(menuitem);
2211     return menuitem;
2212 }
2213
2214 static void add_menu_separator(GtkContainer *cont)
2215 {
2216     GtkWidget *menuitem = gtk_menu_item_new();
2217     gtk_container_add(cont, menuitem);
2218     gtk_widget_show(menuitem);
2219 }
2220
2221 enum { ARG_EITHER, ARG_SAVE, ARG_ID }; /* for argtype */
2222
2223 static frontend *new_window(char *arg, int argtype, char **error)
2224 {
2225     frontend *fe;
2226     GtkBox *vbox, *hbox;
2227     GtkWidget *menu, *menuitem;
2228     GList *iconlist;
2229     int x, y, n;
2230     char errbuf[1024];
2231     extern char *const *const xpm_icons[];
2232     extern const int n_xpm_icons;
2233
2234     fe = snew(frontend);
2235
2236     fe->timer_active = FALSE;
2237     fe->timer_id = -1;
2238
2239     fe->me = midend_new(fe, &thegame, &gtk_drawing, fe);
2240
2241     if (arg) {
2242         char *err;
2243         FILE *fp;
2244
2245         errbuf[0] = '\0';
2246
2247         switch (argtype) {
2248           case ARG_ID:
2249             err = midend_game_id(fe->me, arg);
2250             if (!err)
2251                 midend_new_game(fe->me);
2252             else
2253                 sprintf(errbuf, "Invalid game ID: %.800s", err);
2254             break;
2255           case ARG_SAVE:
2256             fp = fopen(arg, "r");
2257             if (!fp) {
2258                 sprintf(errbuf, "Error opening file: %.800s", strerror(errno));
2259             } else {
2260                 err = midend_deserialise(fe->me, savefile_read, fp);
2261                 if (err)
2262                     sprintf(errbuf, "Invalid save file: %.800s", err);
2263                 fclose(fp);
2264             }
2265             break;
2266           default /*case ARG_EITHER*/:
2267             /*
2268              * First try treating the argument as a game ID.
2269              */
2270             err = midend_game_id(fe->me, arg);
2271             if (!err) {
2272                 /*
2273                  * It's a valid game ID.
2274                  */
2275                 midend_new_game(fe->me);
2276             } else {
2277                 FILE *fp = fopen(arg, "r");
2278                 if (!fp) {
2279                     sprintf(errbuf, "Supplied argument is neither a game ID (%.400s)"
2280                             " nor a save file (%.400s)", err, strerror(errno));
2281                 } else {
2282                     err = midend_deserialise(fe->me, savefile_read, fp);
2283                     if (err)
2284                         sprintf(errbuf, "%.800s", err);
2285                     fclose(fp);
2286                 }
2287             }
2288             break;
2289         }
2290         if (*errbuf) {
2291             *error = dupstr(errbuf);
2292             midend_free(fe->me);
2293             sfree(fe);
2294             return NULL;
2295         }
2296
2297     } else {
2298         midend_new_game(fe->me);
2299     }
2300
2301 #if !GTK_CHECK_VERSION(3,0,0)
2302     {
2303         /*
2304          * try_shrink_drawing_area() will do some fiddling with the
2305          * window size request (see comment in that function) after
2306          * all the bits and pieces such as the menu bar and status bar
2307          * have appeared in the puzzle window.
2308          *
2309          * However, on Unity systems, the menu bar _doesn't_ appear in
2310          * the puzzle window, because the Unity shell hijacks it into
2311          * the menu bar at the very top of the screen. We therefore
2312          * try to detect that situation here, so that we don't sit
2313          * here forever waiting for a menu bar.
2314          */
2315         const char prop[] = "gtk-shell-shows-menubar";
2316         GtkSettings *settings = gtk_settings_get_default();
2317         if (!g_object_class_find_property(G_OBJECT_GET_CLASS(settings),
2318                                           prop)) {
2319             fe->menubar_is_local = TRUE;
2320         } else {
2321             int unity_mode;
2322             g_object_get(gtk_settings_get_default(),
2323                          prop, &unity_mode,
2324                          (const gchar *)NULL);
2325             fe->menubar_is_local = !unity_mode;
2326         }
2327     }
2328 #endif
2329
2330     fe->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
2331     gtk_window_set_title(GTK_WINDOW(fe->window), thegame.name);
2332
2333     vbox = GTK_BOX(gtk_vbox_new(FALSE, 0));
2334     gtk_container_add(GTK_CONTAINER(fe->window), GTK_WIDGET(vbox));
2335     gtk_widget_show(GTK_WIDGET(vbox));
2336
2337     fe->accelgroup = gtk_accel_group_new();
2338     gtk_window_add_accel_group(GTK_WINDOW(fe->window), fe->accelgroup);
2339
2340     hbox = GTK_BOX(gtk_hbox_new(FALSE, 0));
2341     gtk_box_pack_start(vbox, GTK_WIDGET(hbox), FALSE, FALSE, 0);
2342     gtk_widget_show(GTK_WIDGET(hbox));
2343
2344     fe->menubar = gtk_menu_bar_new();
2345     gtk_box_pack_start(hbox, fe->menubar, TRUE, TRUE, 0);
2346     gtk_widget_show(fe->menubar);
2347
2348     menuitem = gtk_menu_item_new_with_mnemonic("_Game");
2349     gtk_container_add(GTK_CONTAINER(fe->menubar), menuitem);
2350     gtk_widget_show(menuitem);
2351
2352     menu = gtk_menu_new();
2353     gtk_menu_item_set_submenu(GTK_MENU_ITEM(menuitem), menu);
2354
2355     add_menu_item_with_key(fe, GTK_CONTAINER(menu), "New", 'n');
2356
2357     menuitem = gtk_menu_item_new_with_label("Restart");
2358     gtk_container_add(GTK_CONTAINER(menu), menuitem);
2359     g_signal_connect(G_OBJECT(menuitem), "activate",
2360                      G_CALLBACK(menu_restart_event), fe);
2361     gtk_widget_show(menuitem);
2362
2363     menuitem = gtk_menu_item_new_with_label("Specific...");
2364     g_object_set_data(G_OBJECT(menuitem), "user-data",
2365                       GINT_TO_POINTER(CFG_DESC));
2366     gtk_container_add(GTK_CONTAINER(menu), menuitem);
2367     g_signal_connect(G_OBJECT(menuitem), "activate",
2368                      G_CALLBACK(menu_config_event), fe);
2369     gtk_widget_show(menuitem);
2370
2371     menuitem = gtk_menu_item_new_with_label("Random Seed...");
2372     g_object_set_data(G_OBJECT(menuitem), "user-data",
2373                       GINT_TO_POINTER(CFG_SEED));
2374     gtk_container_add(GTK_CONTAINER(menu), menuitem);
2375     g_signal_connect(G_OBJECT(menuitem), "activate",
2376                      G_CALLBACK(menu_config_event), fe);
2377     gtk_widget_show(menuitem);
2378
2379     fe->preset_radio = NULL;
2380     fe->preset_custom = NULL;
2381     fe->n_preset_menu_items = 0;
2382     fe->preset_threaded = FALSE;
2383     if ((n = midend_num_presets(fe->me)) > 0 || thegame.can_configure) {
2384         GtkWidget *submenu;
2385         int i;
2386
2387         menuitem = gtk_menu_item_new_with_mnemonic("_Type");
2388         gtk_container_add(GTK_CONTAINER(fe->menubar), menuitem);
2389         gtk_widget_show(menuitem);
2390
2391         submenu = gtk_menu_new();
2392         gtk_menu_item_set_submenu(GTK_MENU_ITEM(menuitem), submenu);
2393
2394         for (i = 0; i < n; i++) {
2395             char *name;
2396             game_params *params;
2397
2398             midend_fetch_preset(fe->me, i, &name, &params);
2399
2400             menuitem =
2401                 gtk_radio_menu_item_new_with_label(fe->preset_radio, name);
2402             fe->preset_radio =
2403                 gtk_radio_menu_item_get_group(GTK_RADIO_MENU_ITEM(menuitem));
2404             fe->n_preset_menu_items++;
2405             gtk_container_add(GTK_CONTAINER(submenu), menuitem);
2406             g_object_set_data(G_OBJECT(menuitem), "user-data", params);
2407             g_signal_connect(G_OBJECT(menuitem), "activate",
2408                              G_CALLBACK(menu_preset_event), fe);
2409             gtk_widget_show(menuitem);
2410         }
2411
2412         if (thegame.can_configure) {
2413             menuitem = fe->preset_custom =
2414                 gtk_radio_menu_item_new_with_label(fe->preset_radio,
2415                                                    "Custom...");
2416             fe->preset_radio =
2417                 gtk_radio_menu_item_get_group(GTK_RADIO_MENU_ITEM(menuitem));
2418             gtk_container_add(GTK_CONTAINER(submenu), menuitem);
2419             g_object_set_data(G_OBJECT(menuitem), "user-data",
2420                               GINT_TO_POINTER(CFG_SETTINGS));
2421             g_signal_connect(G_OBJECT(menuitem), "activate",
2422                              G_CALLBACK(menu_config_event), fe);
2423             gtk_widget_show(menuitem);
2424         }
2425
2426     }
2427
2428     add_menu_separator(GTK_CONTAINER(menu));
2429     menuitem = gtk_menu_item_new_with_label("Load...");
2430     gtk_container_add(GTK_CONTAINER(menu), menuitem);
2431     g_signal_connect(G_OBJECT(menuitem), "activate",
2432                      G_CALLBACK(menu_load_event), fe);
2433     gtk_widget_show(menuitem);
2434     menuitem = gtk_menu_item_new_with_label("Save...");
2435     gtk_container_add(GTK_CONTAINER(menu), menuitem);
2436     g_signal_connect(G_OBJECT(menuitem), "activate",
2437                      G_CALLBACK(menu_save_event), fe);
2438     gtk_widget_show(menuitem);
2439 #ifndef STYLUS_BASED
2440     add_menu_separator(GTK_CONTAINER(menu));
2441     add_menu_item_with_key(fe, GTK_CONTAINER(menu), "Undo", 'u');
2442     add_menu_item_with_key(fe, GTK_CONTAINER(menu), "Redo", 'r');
2443 #endif
2444     if (thegame.can_format_as_text_ever) {
2445         add_menu_separator(GTK_CONTAINER(menu));
2446         menuitem = gtk_menu_item_new_with_label("Copy");
2447         gtk_container_add(GTK_CONTAINER(menu), menuitem);
2448         g_signal_connect(G_OBJECT(menuitem), "activate",
2449                          G_CALLBACK(menu_copy_event), fe);
2450         gtk_widget_show(menuitem);
2451         fe->copy_menu_item = menuitem;
2452     } else {
2453         fe->copy_menu_item = NULL;
2454     }
2455     if (thegame.can_solve) {
2456         add_menu_separator(GTK_CONTAINER(menu));
2457         menuitem = gtk_menu_item_new_with_label("Solve");
2458         gtk_container_add(GTK_CONTAINER(menu), menuitem);
2459         g_signal_connect(G_OBJECT(menuitem), "activate",
2460                          G_CALLBACK(menu_solve_event), fe);
2461         gtk_widget_show(menuitem);
2462     }
2463     add_menu_separator(GTK_CONTAINER(menu));
2464     add_menu_item_with_key(fe, GTK_CONTAINER(menu), "Exit", 'q');
2465
2466     menuitem = gtk_menu_item_new_with_mnemonic("_Help");
2467     gtk_container_add(GTK_CONTAINER(fe->menubar), menuitem);
2468     gtk_widget_show(menuitem);
2469
2470     menu = gtk_menu_new();
2471     gtk_menu_item_set_submenu(GTK_MENU_ITEM(menuitem), menu);
2472
2473     menuitem = gtk_menu_item_new_with_label("About");
2474     gtk_container_add(GTK_CONTAINER(menu), menuitem);
2475     g_signal_connect(G_OBJECT(menuitem), "activate",
2476                      G_CALLBACK(menu_about_event), fe);
2477     gtk_widget_show(menuitem);
2478
2479 #ifdef STYLUS_BASED
2480     menuitem=gtk_button_new_with_mnemonic("_Redo");
2481     g_object_set_data(G_OBJECT(menuitem), "user-data",
2482                       GINT_TO_POINTER((int)('r')));
2483     g_signal_connect(G_OBJECT(menuitem), "clicked",
2484                      G_CALLBACK(menu_key_event), fe);
2485     gtk_box_pack_end(hbox, menuitem, FALSE, FALSE, 0);
2486     gtk_widget_show(menuitem);
2487
2488     menuitem=gtk_button_new_with_mnemonic("_Undo");
2489     g_object_set_data(G_OBJECT(menuitem), "user-data",
2490                       GINT_TO_POINTER((int)('u')));
2491     g_signal_connect(G_OBJECT(menuitem), "clicked",
2492                      G_CALLBACK(menu_key_event), fe);
2493     gtk_box_pack_end(hbox, menuitem, FALSE, FALSE, 0);
2494     gtk_widget_show(menuitem);
2495
2496     if (thegame.flags & REQUIRE_NUMPAD) {
2497         hbox = GTK_BOX(gtk_hbox_new(FALSE, 0));
2498         gtk_box_pack_start(vbox, GTK_WIDGET(hbox), FALSE, FALSE, 0);
2499         gtk_widget_show(GTK_WIDGET(hbox));
2500
2501         *((int*)errbuf)=0;
2502         errbuf[1]='\0';
2503         for(errbuf[0]='0';errbuf[0]<='9';errbuf[0]++) {
2504             menuitem=gtk_button_new_with_label(errbuf);
2505             g_object_set_data(G_OBJECT(menuitem), "user-data",
2506                               GINT_TO_POINTER((int)(errbuf[0])));
2507             g_signal_connect(G_OBJECT(menuitem), "clicked",
2508                              G_CALLBACK(menu_key_event), fe);
2509             gtk_box_pack_start(hbox, menuitem, TRUE, TRUE, 0);
2510             gtk_widget_show(menuitem);
2511         }
2512     }
2513 #endif /* STYLUS_BASED */
2514
2515     changed_preset(fe);
2516
2517     snaffle_colours(fe);
2518
2519     if (midend_wants_statusbar(fe->me)) {
2520         GtkWidget *viewport;
2521         GtkRequisition req;
2522
2523         viewport = gtk_viewport_new(NULL, NULL);
2524         gtk_viewport_set_shadow_type(GTK_VIEWPORT(viewport), GTK_SHADOW_NONE);
2525         fe->statusbar = gtk_statusbar_new();
2526         gtk_container_add(GTK_CONTAINER(viewport), fe->statusbar);
2527         gtk_widget_show(viewport);
2528         gtk_box_pack_end(vbox, viewport, FALSE, FALSE, 0);
2529         gtk_widget_show(fe->statusbar);
2530         fe->statusctx = gtk_statusbar_get_context_id
2531             (GTK_STATUSBAR(fe->statusbar), "game");
2532         gtk_statusbar_push(GTK_STATUSBAR(fe->statusbar), fe->statusctx,
2533                            "test");
2534         gtk_widget_size_request(fe->statusbar, &req);
2535 #if 0
2536         /* For GTK 2.0, should we be using gtk_widget_set_size_request? */
2537 #endif
2538         gtk_widget_set_usize(viewport, -1, req.height);
2539     } else
2540         fe->statusbar = NULL;
2541
2542     fe->area = gtk_drawing_area_new();
2543 #if GTK_CHECK_VERSION(2,0,0)
2544     gtk_widget_set_double_buffered(fe->area, FALSE);
2545 #endif
2546     {
2547         GdkGeometry geom;
2548         geom.base_width = geom.base_height = 0;
2549         gtk_window_set_geometry_hints(GTK_WINDOW(fe->window), fe->area,
2550                                       &geom, GDK_HINT_BASE_SIZE);
2551     }
2552     get_size(fe, &x, &y);
2553 #if GTK_CHECK_VERSION(3,0,0)
2554     gtk_window_set_default_geometry(GTK_WINDOW(fe->window), x, y);
2555 #else
2556     fe->drawing_area_shrink_pending = FALSE;
2557     gtk_drawing_area_size(GTK_DRAWING_AREA(fe->area), x, y);
2558 #endif
2559     fe->w = x;
2560     fe->h = y;
2561
2562     gtk_box_pack_end(vbox, fe->area, TRUE, TRUE, 0);
2563
2564     clear_backing_store(fe);
2565     fe->fonts = NULL;
2566     fe->nfonts = fe->fontsize = 0;
2567
2568     fe->paste_data = NULL;
2569     fe->paste_data_len = 0;
2570
2571     g_signal_connect(G_OBJECT(fe->window), "destroy",
2572                      G_CALLBACK(destroy), fe);
2573     g_signal_connect(G_OBJECT(fe->window), "key_press_event",
2574                      G_CALLBACK(key_event), fe);
2575     g_signal_connect(G_OBJECT(fe->area), "button_press_event",
2576                      G_CALLBACK(button_event), fe);
2577     g_signal_connect(G_OBJECT(fe->area), "button_release_event",
2578                      G_CALLBACK(button_event), fe);
2579     g_signal_connect(G_OBJECT(fe->area), "motion_notify_event",
2580                      G_CALLBACK(motion_event), fe);
2581     g_signal_connect(G_OBJECT(fe->area), "selection_get",
2582                      G_CALLBACK(selection_get), fe);
2583     g_signal_connect(G_OBJECT(fe->area), "selection_clear_event",
2584                      G_CALLBACK(selection_clear), fe);
2585 #if GTK_CHECK_VERSION(3,0,0)
2586     g_signal_connect(G_OBJECT(fe->area), "draw",
2587                      G_CALLBACK(draw_area), fe);
2588 #else
2589     g_signal_connect(G_OBJECT(fe->area), "expose_event",
2590                      G_CALLBACK(expose_area), fe);
2591 #endif
2592     g_signal_connect(G_OBJECT(fe->window), "map_event",
2593                      G_CALLBACK(map_window), fe);
2594     g_signal_connect(G_OBJECT(fe->area), "configure_event",
2595                      G_CALLBACK(configure_area), fe);
2596     g_signal_connect(G_OBJECT(fe->window), "configure_event",
2597                      G_CALLBACK(configure_window), fe);
2598
2599     gtk_widget_add_events(GTK_WIDGET(fe->area),
2600                           GDK_BUTTON_PRESS_MASK |
2601                           GDK_BUTTON_RELEASE_MASK |
2602                           GDK_BUTTON_MOTION_MASK |
2603                           GDK_POINTER_MOTION_HINT_MASK);
2604
2605     if (n_xpm_icons) {
2606         gtk_window_set_icon(GTK_WINDOW(fe->window),
2607                             gdk_pixbuf_new_from_xpm_data
2608                             ((const gchar **)xpm_icons[0]));
2609
2610         iconlist = NULL;
2611         for (n = 0; n < n_xpm_icons; n++) {
2612             iconlist =
2613                 g_list_append(iconlist,
2614                               gdk_pixbuf_new_from_xpm_data((const gchar **)
2615                                                            xpm_icons[n]));
2616         }
2617         gtk_window_set_icon_list(GTK_WINDOW(fe->window), iconlist);
2618     }
2619
2620     gtk_widget_show(fe->area);
2621     gtk_widget_show(fe->window);
2622
2623 #if !GTK_CHECK_VERSION(3,0,0)
2624     fe->drawing_area_shrink_pending = TRUE;
2625     try_shrink_drawing_area(fe);
2626 #endif
2627
2628     set_window_background(fe, 0);
2629
2630     return fe;
2631 }
2632
2633 char *fgetline(FILE *fp)
2634 {
2635     char *ret = snewn(512, char);
2636     int size = 512, len = 0;
2637     while (fgets(ret + len, size - len, fp)) {
2638         len += strlen(ret + len);
2639         if (ret[len-1] == '\n')
2640             break;                     /* got a newline, we're done */
2641         size = len + 512;
2642         ret = sresize(ret, size, char);
2643     }
2644     if (len == 0) {                    /* first fgets returned NULL */
2645         sfree(ret);
2646         return NULL;
2647     }
2648     ret[len] = '\0';
2649     return ret;
2650 }
2651
2652 int main(int argc, char **argv)
2653 {
2654     char *pname = argv[0];
2655     char *error;
2656     int ngenerate = 0, print = FALSE, px = 1, py = 1;
2657     int time_generation = FALSE, test_solve = FALSE, list_presets = FALSE;
2658     int soln = FALSE, colour = FALSE;
2659     float scale = 1.0F;
2660     float redo_proportion = 0.0F;
2661     char *savefile = NULL, *savesuffix = NULL;
2662     char *arg = NULL;
2663     int argtype = ARG_EITHER;
2664     char *screenshot_file = NULL;
2665     int doing_opts = TRUE;
2666     int ac = argc;
2667     char **av = argv;
2668     char errbuf[500];
2669
2670     /*
2671      * Command line parsing in this function is rather fiddly,
2672      * because GTK wants to have a go at argc/argv _first_ - and
2673      * yet we can't let it, because gtk_init() will bomb out if it
2674      * can't open an X display, whereas in fact we want to permit
2675      * our --generate and --print modes to run without an X
2676      * display.
2677      *
2678      * So what we do is:
2679      *  - we parse the command line ourselves, without modifying
2680      *    argc/argv
2681      *  - if we encounter an error which might plausibly be the
2682      *    result of a GTK command line (i.e. not detailed errors in
2683      *    particular options of ours) we store the error message
2684      *    and terminate parsing.
2685      *  - if we got enough out of the command line to know it
2686      *    specifies a non-X mode of operation, we either display
2687      *    the stored error and return failure, or if there is no
2688      *    stored error we do the non-X operation and return
2689      *    success.
2690      *  - otherwise, we go straight to gtk_init().
2691      */
2692
2693     errbuf[0] = '\0';
2694     while (--ac > 0) {
2695         char *p = *++av;
2696         if (doing_opts && !strcmp(p, "--version")) {
2697             printf("%s, from Simon Tatham's Portable Puzzle Collection\n%s\n",
2698                    thegame.name, ver);
2699             return 0;
2700         } else if (doing_opts && !strcmp(p, "--generate")) {
2701             if (--ac > 0) {
2702                 ngenerate = atoi(*++av);
2703                 if (!ngenerate) {
2704                     fprintf(stderr, "%s: '--generate' expected a number\n",
2705                             pname);
2706                     return 1;
2707                 }
2708             } else
2709                 ngenerate = 1;
2710         } else if (doing_opts && !strcmp(p, "--time-generation")) {
2711             time_generation = TRUE;
2712         } else if (doing_opts && !strcmp(p, "--test-solve")) {
2713             test_solve = TRUE;
2714         } else if (doing_opts && !strcmp(p, "--list-presets")) {
2715             list_presets = TRUE;
2716         } else if (doing_opts && !strcmp(p, "--save")) {
2717             if (--ac > 0) {
2718                 savefile = *++av;
2719             } else {
2720                 fprintf(stderr, "%s: '--save' expected a filename\n",
2721                         pname);
2722                 return 1;
2723             }
2724         } else if (doing_opts && (!strcmp(p, "--save-suffix") ||
2725                                   !strcmp(p, "--savesuffix"))) {
2726             if (--ac > 0) {
2727                 savesuffix = *++av;
2728             } else {
2729                 fprintf(stderr, "%s: '--save-suffix' expected a filename\n",
2730                         pname);
2731                 return 1;
2732             }
2733         } else if (doing_opts && !strcmp(p, "--print")) {
2734             if (!thegame.can_print) {
2735                 fprintf(stderr, "%s: this game does not support printing\n",
2736                         pname);
2737                 return 1;
2738             }
2739             print = TRUE;
2740             if (--ac > 0) {
2741                 char *dim = *++av;
2742                 if (sscanf(dim, "%dx%d", &px, &py) != 2) {
2743                     fprintf(stderr, "%s: unable to parse argument '%s' to "
2744                             "'--print'\n", pname, dim);
2745                     return 1;
2746                 }
2747             } else {
2748                 px = py = 1;
2749             }
2750         } else if (doing_opts && !strcmp(p, "--scale")) {
2751             if (--ac > 0) {
2752                 scale = atof(*++av);
2753             } else {
2754                 fprintf(stderr, "%s: no argument supplied to '--scale'\n",
2755                         pname);
2756                 return 1;
2757             }
2758         } else if (doing_opts && !strcmp(p, "--redo")) {
2759             /*
2760              * This is an internal option which I don't expect
2761              * users to have any particular use for. The effect of
2762              * --redo is that once the game has been loaded and
2763              * initialised, the next move in the redo chain is
2764              * replayed, and the game screen is redrawn part way
2765              * through the making of the move. This is only
2766              * meaningful if there _is_ a next move in the redo
2767              * chain, which means in turn that this option is only
2768              * useful if you're also passing a save file on the
2769              * command line.
2770              *
2771              * This option is used by the script which generates
2772              * the puzzle icons and website screenshots, and I
2773              * don't imagine it's useful for anything else.
2774              * (Unless, I suppose, users don't like my screenshots
2775              * and want to generate their own in the same way for
2776              * some repackaged version of the puzzles.)
2777              */
2778             if (--ac > 0) {
2779                 redo_proportion = atof(*++av);
2780             } else {
2781                 fprintf(stderr, "%s: no argument supplied to '--redo'\n",
2782                         pname);
2783                 return 1;
2784             }
2785         } else if (doing_opts && !strcmp(p, "--screenshot")) {
2786             /*
2787              * Another internal option for the icon building
2788              * script. This causes a screenshot of the central
2789              * drawing area (i.e. not including the menu bar or
2790              * status bar) to be saved to a PNG file once the
2791              * window has been drawn, and then the application
2792              * quits immediately.
2793              */
2794             if (--ac > 0) {
2795                 screenshot_file = *++av;
2796             } else {
2797                 fprintf(stderr, "%s: no argument supplied to '--screenshot'\n",
2798                         pname);
2799                 return 1;
2800             }
2801         } else if (doing_opts && (!strcmp(p, "--with-solutions") ||
2802                                   !strcmp(p, "--with-solution") ||
2803                                   !strcmp(p, "--with-solns") ||
2804                                   !strcmp(p, "--with-soln") ||
2805                                   !strcmp(p, "--solutions") ||
2806                                   !strcmp(p, "--solution") ||
2807                                   !strcmp(p, "--solns") ||
2808                                   !strcmp(p, "--soln"))) {
2809             soln = TRUE;
2810         } else if (doing_opts && !strcmp(p, "--colour")) {
2811             if (!thegame.can_print_in_colour) {
2812                 fprintf(stderr, "%s: this game does not support colour"
2813                         " printing\n", pname);
2814                 return 1;
2815             }
2816             colour = TRUE;
2817         } else if (doing_opts && !strcmp(p, "--load")) {
2818             argtype = ARG_SAVE;
2819         } else if (doing_opts && !strcmp(p, "--game")) {
2820             argtype = ARG_ID;
2821         } else if (doing_opts && !strcmp(p, "--")) {
2822             doing_opts = FALSE;
2823         } else if (!doing_opts || p[0] != '-') {
2824             if (arg) {
2825                 fprintf(stderr, "%s: more than one argument supplied\n",
2826                         pname);
2827                 return 1;
2828             }
2829             arg = p;
2830         } else {
2831             sprintf(errbuf, "%.100s: unrecognised option '%.100s'\n",
2832                     pname, p);
2833             break;
2834         }
2835     }
2836
2837     /*
2838      * Special standalone mode for generating puzzle IDs on the
2839      * command line. Useful for generating puzzles to be printed
2840      * out and solved offline (for puzzles where that even makes
2841      * sense - Solo, for example, is a lot more pencil-and-paper
2842      * friendly than Twiddle!)
2843      *
2844      * Usage:
2845      *
2846      *   <puzzle-name> --generate [<n> [<params>]]
2847      *
2848      * <n>, if present, is the number of puzzle IDs to generate.
2849      * <params>, if present, is the same type of parameter string
2850      * you would pass to the puzzle when running it in GUI mode,
2851      * including optional extras such as the expansion factor in
2852      * Rectangles and the difficulty level in Solo.
2853      *
2854      * If you specify <params>, you must also specify <n> (although
2855      * you may specify it to be 1). Sorry; that was the
2856      * simplest-to-parse command-line syntax I came up with.
2857      */
2858     if (ngenerate > 0 || print || savefile || savesuffix) {
2859         int i, n = 1;
2860         midend *me;
2861         char *id;
2862         document *doc = NULL;
2863
2864         /*
2865          * If we're in this branch, we should display any pending
2866          * error message from the command line, since GTK isn't going
2867          * to take another crack at making sense of it.
2868          */
2869         if (*errbuf) {
2870             fputs(errbuf, stderr);
2871             return 1;
2872         }
2873
2874         n = ngenerate;
2875
2876         me = midend_new(NULL, &thegame, NULL, NULL);
2877         i = 0;
2878
2879         if (savefile && !savesuffix)
2880             savesuffix = "";
2881         if (!savefile && savesuffix)
2882             savefile = "";
2883
2884         if (print)
2885             doc = document_new(px, py, scale);
2886
2887         /*
2888          * In this loop, we either generate a game ID or read one
2889          * from stdin depending on whether we're in generate mode;
2890          * then we either write it to stdout or print it, depending
2891          * on whether we're in print mode. Thus, this loop handles
2892          * generate-to-stdout, print-from-stdin and generate-and-
2893          * immediately-print modes.
2894          *
2895          * (It could also handle a copy-stdin-to-stdout mode,
2896          * although there's currently no combination of options
2897          * which will cause this loop to be activated in that mode.
2898          * It wouldn't be _entirely_ pointless, though, because
2899          * stdin could contain bare params strings or random-seed
2900          * IDs, and stdout would contain nothing but fully
2901          * generated descriptive game IDs.)
2902          */
2903         while (ngenerate == 0 || i < n) {
2904             char *pstr, *err, *seed;
2905             struct rusage before, after;
2906
2907             if (ngenerate == 0) {
2908                 pstr = fgetline(stdin);
2909                 if (!pstr)
2910                     break;
2911                 pstr[strcspn(pstr, "\r\n")] = '\0';
2912             } else {
2913                 if (arg) {
2914                     pstr = snewn(strlen(arg) + 40, char);
2915
2916                     strcpy(pstr, arg);
2917                     if (i > 0 && strchr(arg, '#'))
2918                         sprintf(pstr + strlen(pstr), "-%d", i);
2919                 } else
2920                     pstr = NULL;
2921             }
2922
2923             if (pstr) {
2924                 err = midend_game_id(me, pstr);
2925                 if (err) {
2926                     fprintf(stderr, "%s: error parsing '%s': %s\n",
2927                             pname, pstr, err);
2928                     return 1;
2929                 }
2930             }
2931
2932             if (time_generation)
2933                 getrusage(RUSAGE_SELF, &before);
2934
2935             midend_new_game(me);
2936
2937             seed = midend_get_random_seed(me);
2938
2939             if (time_generation) {
2940                 double elapsed;
2941
2942                 getrusage(RUSAGE_SELF, &after);
2943
2944                 elapsed = (after.ru_utime.tv_sec -
2945                            before.ru_utime.tv_sec);
2946                 elapsed += (after.ru_utime.tv_usec -
2947                             before.ru_utime.tv_usec) / 1000000.0;
2948
2949                 printf("%s %s: %.6f\n", thegame.name, seed, elapsed);
2950             }
2951
2952             if (test_solve && thegame.can_solve) {
2953                 /*
2954                  * Now destroy the aux_info in the midend, by means of
2955                  * re-entering the same game id, and then try to solve
2956                  * it.
2957                  */
2958                 char *game_id, *err;
2959
2960                 game_id = midend_get_game_id(me);
2961                 err = midend_game_id(me, game_id);
2962                 if (err) {
2963                     fprintf(stderr, "%s %s: game id re-entry error: %s\n",
2964                             thegame.name, seed, err);
2965                     return 1;
2966                 }
2967                 midend_new_game(me);
2968                 sfree(game_id);
2969
2970                 err = midend_solve(me);
2971                 /*
2972                  * If the solve operation returned the error "Solution
2973                  * not known for this puzzle", that's OK, because that
2974                  * just means it's a puzzle for which we don't have an
2975                  * algorithmic solver and hence can't solve it without
2976                  * the aux_info, e.g. Netslide. Any other error is a
2977                  * problem, though.
2978                  */
2979                 if (err && strcmp(err, "Solution not known for this puzzle")) {
2980                     fprintf(stderr, "%s %s: solve error: %s\n",
2981                             thegame.name, seed, err);
2982                     return 1;
2983                 }
2984             }
2985
2986             sfree(pstr);
2987             sfree(seed);
2988
2989             if (doc) {
2990                 err = midend_print_puzzle(me, doc, soln);
2991                 if (err) {
2992                     fprintf(stderr, "%s: error in printing: %s\n", pname, err);
2993                     return 1;
2994                 }
2995             }
2996             if (savefile) {
2997                 struct savefile_write_ctx ctx;
2998                 char *realname = snewn(40 + strlen(savefile) +
2999                                        strlen(savesuffix), char);
3000                 sprintf(realname, "%s%d%s", savefile, i, savesuffix);
3001
3002                 if (soln) {
3003                     char *err = midend_solve(me);
3004                     if (err) {
3005                         fprintf(stderr, "%s: unable to show solution: %s\n",
3006                                 realname, err);
3007                         return 1;
3008                     }
3009                 }
3010
3011                 ctx.fp = fopen(realname, "w");
3012                 if (!ctx.fp) {
3013                     fprintf(stderr, "%s: open: %s\n", realname,
3014                             strerror(errno));
3015                     return 1;
3016                 }
3017                 ctx.error = 0;
3018                 midend_serialise(me, savefile_write, &ctx);
3019                 if (ctx.error) {
3020                     fprintf(stderr, "%s: write: %s\n", realname,
3021                             strerror(ctx.error));
3022                     return 1;
3023                 }
3024                 if (fclose(ctx.fp)) {
3025                     fprintf(stderr, "%s: close: %s\n", realname,
3026                             strerror(errno));
3027                     return 1;
3028                 }
3029                 sfree(realname);
3030             }
3031             if (!doc && !savefile && !time_generation) {
3032                 id = midend_get_game_id(me);
3033                 puts(id);
3034                 sfree(id);
3035             }
3036
3037             i++;
3038         }
3039
3040         if (doc) {
3041             psdata *ps = ps_init(stdout, colour);
3042             document_print(doc, ps_drawing_api(ps));
3043             document_free(doc);
3044             ps_free(ps);
3045         }
3046
3047         midend_free(me);
3048
3049         return 0;
3050     } else if (list_presets) {
3051         /*
3052          * Another specialist mode which causes the puzzle to list the
3053          * game_params strings for all its preset configurations.
3054          */
3055         int i, npresets;
3056         midend *me;
3057
3058         me = midend_new(NULL, &thegame, NULL, NULL);
3059         npresets = midend_num_presets(me);
3060
3061         for (i = 0; i < npresets; i++) {
3062             game_params *params;
3063             char *name, *paramstr;
3064
3065             midend_fetch_preset(me, i, &name, &params);
3066             paramstr = thegame.encode_params(params, TRUE);
3067
3068             printf("%s %s\n", paramstr, name);
3069             sfree(paramstr);
3070         }
3071
3072         midend_free(me);
3073         return 0;
3074     } else {
3075         frontend *fe;
3076
3077         gtk_init(&argc, &argv);
3078
3079         fe = new_window(arg, argtype, &error);
3080
3081         if (!fe) {
3082             fprintf(stderr, "%s: %s\n", pname, error);
3083             return 1;
3084         }
3085
3086         if (screenshot_file) {
3087             /*
3088              * Some puzzles will not redraw their entire area if
3089              * given a partially completed animation, which means
3090              * we must redraw now and _then_ redraw again after
3091              * freezing the move timer.
3092              */
3093             midend_force_redraw(fe->me);
3094         }
3095
3096         if (redo_proportion) {
3097             /* Start a redo. */
3098             midend_process_key(fe->me, 0, 0, 'r');
3099             /* And freeze the timer at the specified position. */
3100             midend_freeze_timer(fe->me, redo_proportion);
3101         }
3102
3103         if (screenshot_file) {
3104             save_screenshot_png(fe, screenshot_file);
3105             exit(0);
3106         }
3107
3108         gtk_main();
3109     }
3110
3111     return 0;
3112 }