gtk.c

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