src/x11.c

   1 /*
   2  * X11 GUI for slide puzzle game
   3  * Copyright © 2022 Nick Bowler
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <config.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <stddef.h>
  23 #include <assert.h>
  24
  25 #include <X11/Intrinsic.h>
  26 #include <X11/StringDefs.h>
  27 #include <X11/Xatom.h>
  28 #include <X11/Shell.h>
  29
  30 #include "motif.h"
  31 #include "ewmhicon.h"
  32
  33 /* Size of the traditional icon pixmap (multiple of 3) */
  34 #define ICON_SIZE 48
  35
  36 /* Define to 1 to add highlights and delays for visually debugging redraws */
  37 #if X11_RENDER_DEBUG
  38 #  include <unistd.h>
  39 #endif
  40
  41 enum {
  42         NUM_TILE_COLOURS = COLOUR_MAX*(TILE_MAX-1),
  43         COLOUR_UI_GAMEBG = NUM_TILE_COLOURS,
  44         COLOUR_UI_MAX
  45 };
  46 typedef Pixel colour_tab[COLOUR_UI_MAX];
  47
  48 #define COLOURRES(name, index, def) { \
  49         (name), (NULL), XtRPixel, sizeof (String), \
  50         offsetof(struct { colour_tab t; }, t[index]), \
  51         XtRString, (def) }
  52
  53 static XtResource colour_resources[] = {
  54         COLOURRES("colour0", 0, COLOUR0_PRIMARY),
  55         COLOURRES("colour1", 1, COLOUR1_PRIMARY),
  56         COLOURRES("colour2", 2, COLOUR2_PRIMARY),
  57         COLOURRES("colour3", 3, COLOUR3_PRIMARY),
  58         COLOURRES("colour4", 4, COLOUR4_PRIMARY),
  59         COLOURRES("colour5", 5, COLOUR5_PRIMARY),
  60
  61         COLOURRES("colourDark0",  6, COLOUR0_DARK),
  62         COLOURRES("colourDark1",  7, COLOUR1_DARK),
  63         COLOURRES("colourDark2",  8, COLOUR2_DARK),
  64         COLOURRES("colourDark3",  9, COLOUR3_DARK),
  65         COLOURRES("colourDark4", 10, COLOUR4_DARK),
  66         COLOURRES("colourDark5", 11, COLOUR5_DARK),
  67
  68         COLOURRES("colourLight0", 12, COLOUR0_LIGHT),
  69         COLOURRES("colourLight1", 13, COLOUR1_LIGHT),
  70         COLOURRES("colourLight2", 14, COLOUR2_LIGHT),
  71         COLOURRES("colourLight3", 15, COLOUR3_LIGHT),
  72         COLOURRES("colourLight4", 16, COLOUR4_LIGHT),
  73         COLOURRES("colourLight5", 17, COLOUR5_LIGHT),
  74
  75         COLOURRES("gameBackground", COLOUR_UI_GAMEBG, "#181818")
  76 };
  77
  78 static void init_colours(struct app_state *state, Widget shell)
  79 {
  80         unsigned i;
  81
  82         colour_tab colours;
  83         XtGetApplicationResources(shell, &colours, colour_resources,
  84                                   XtNumber(colour_resources), NULL, 0);
  85
  86         for (i = 0; i < NUM_TILE_COLOURS; i++) {
  87                 unsigned tile = i % (TILE_MAX-1), shade = i / (TILE_MAX-1);
  88
  89                 state->tile_colour[tile][shade] = colours[i];
  90         }
  91
  92         XtVaSetValues(state->game, XtNbackground, colours[COLOUR_UI_GAMEBG],
  93                                    (char *)NULL);
  94 }
  95
  96 void x11_initialize(struct app_state *state, Widget shell)
  97 {
  98         Display *display = XtDisplay(shell);
  99         Screen *screen = XtScreen(shell);
 100         Window root = RootWindowOfScreen(screen);
 101         XGCValues gcv;
 102
 103         init_colours(state, shell);
 104
 105         gcv.line_width = 1;
 106         state->tile_gc = XCreateGC(display, root, GCLineWidth, &gcv);
 107
 108         state->icon_pixmap = XCreatePixmap(display, root, ICON_SIZE, ICON_SIZE,
 109                                            DefaultDepthOfScreen(screen));
 110 }
 111
 112 static void draw_tile(struct app_state *state, Display *display, Drawable d,
 113                       int tile, int gx, int gy, Dimension tw, Dimension th)
 114 {
 115         int tx = gx * tw, ty = gy * th;
 116
 117         XSegment topshadow[] = {
 118                 { tx,      ty,      tx,      ty+th   },
 119                 { tx+1,    ty,      tx+tw,   ty      },
 120
 121                 { tx+1,    ty+1,    tx+1,    ty+th-1 },
 122                 { tx+2,    ty+1,    tx+tw-1, ty+1    }
 123         };
 124
 125         XSegment bottomshadow[] = {
 126                 { tx+1,    ty+th-1, tx+tw,   ty+th-1 },
 127                 { tx+tw-1, ty+th-1, tx+tw-1, ty+1    },
 128
 129                 { tx+2,    ty+th-2, tx+tw-1, ty+th-2 },
 130                 { tx+tw-2, ty+th-2, tx+tw-2, ty+2    }
 131         };
 132
 133         XSetForeground(display, state->tile_gc, state->tile_colour[tile-1][COLOUR_LIGHT]);
 134         XDrawSegments(display, d, state->tile_gc, topshadow, XtNumber(topshadow));
 135
 136         XSetForeground(display, state->tile_gc, state->tile_colour[tile-1][COLOUR_DARK]);
 137         XDrawSegments(display, d, state->tile_gc, bottomshadow, XtNumber(bottomshadow));
 138
 139         XSetForeground(display, state->tile_gc, state->tile_colour[tile-1][COLOUR_PRIMARY]);
 140         XFillRectangle(display, d, state->tile_gc, tx+2, ty+2, tw-4, th-4);
 141 }
 142
 143 static void
 144 clear_rect(Display *display, Drawable d, int x, int y, int w, int h)
 145 {
 146 #if X11_RENDER_DEBUG
 147         XRectangle r = { x, y, w, h };
 148         XGCValues gcv;
 149         GC gc;
 150
 151         gcv.foreground = 0xff0000;
 152         gc = XCreateGC(display, d, GCForeground, &gcv);
 153         XFillRectangles(display, d, gc, &r, 1);
 154         XFreeGC(display, gc);
 155
 156         XFlush(display);
 157         usleep(70000);
 158 #endif
 159
 160         XClearArea(display, d, x, y, w, h, 0);
 161 }
 162
 163 /*
 164  * Efficiently clear all the border tiles in the game area.  The mask indicates
 165  * which tiles need clearing, but for the border clear it is safe to wipe an
 166  * entire row or column of the border using a single XClearArea.
 167  */
 168 static void clear_border(Display *display, Drawable d, unsigned sz)
 169 {
 170         clear_rect(display, d, 0,    0,    -1, sz);
 171         clear_rect(display, d, 0,    4*sz, -1, sz);
 172         clear_rect(display, d, 0,    0,    sz, -1);
 173         clear_rect(display, d, 4*sz, 0,    sz, -1);
 174 }
 175
 176 static int
 177 redraw_tile(struct app_state *state, Display *display, Drawable d,
 178             uint_least32_t *gp, int x, int y, unsigned sz)
 179 {
 180         unsigned tile = board_tile(gp, 5*y+x);
 181         unsigned w = sz, h = sz;
 182
 183 #if X11_RENDER_DEBUG
 184         if (d == XtWindow(state->game) || d == XtWindow(state->goal)) {
 185                 XRectangle r = { x*w, y*h, w, h };
 186                 XSetForeground(display, state->tile_gc, 0xff0000);
 187                 XFillRectangles(display, d, state->tile_gc, &r, 1);
 188                 XFlush(display);
 189                 usleep(70000);
 190         }
 191 #endif
 192         assert(tile < TILE_MAX);
 193         if (tile == TILE_EMPTY) {
 194                 XClearArea(display, d, x*w, y*h, w, h, 0);
 195         } else {
 196                 draw_tile(state, display, d, tile, x, y, w, h);
 197         }
 198
 199         return tile;
 200 }
 201
 202 static void set_icon(struct app_state *state, Display *display,
 203                      Widget shell, unsigned long *ewmhseq)
 204 {
 205         /*
 206          * Clear and reset XtNiconPixmap otherwise it seems dtwm will not
 207          * notice the changed icon.
 208          */
 209         XtVaSetValues(shell, XtNiconPixmap, None, (char *)NULL);
 210         XtVaSetValues(shell, XtNiconPixmap, state->icon_pixmap, (char *)NULL);
 211
 212         if (state->use_ewmh_icons) {
 213                 Atom net_wm_icon = XInternAtom(display, "_NET_WM_ICON", FALSE);
 214                 Colormap cmap = DefaultColormapOfScreen(XtScreen(shell));
 215                 XColor colours[(TILE_MAX-1)*COLOUR_MAX];
 216                 void *wm_icon;
 217                 int i;
 218
 219                 for (i = 0; i < XtNumber(colours); i++) {
 220                         uint_least32_t *p = state->tile_colour[0];
 221                         colours[i].pixel = p[i];
 222                 }
 223
 224                 XQueryColors(display, cmap, colours, XtNumber(colours));
 225                 wm_icon = ewmh_icon_generate(ewmhseq, colours);
 226                 if (wm_icon) {
 227                         XChangeProperty(display, XtWindow(shell), net_wm_icon,
 228                                         XA_CARDINAL, 32, PropModeReplace,
 229                                         wm_icon, EWMH_ICON_NELEM);
 230                 }
 231                 free(wm_icon);
 232         }
 233 }
 234
 235 void
 236 x11_redraw_goal(struct app_state *state, uint_fast32_t mask, Widget icon_shell)
 237 {
 238         Display *display = XtDisplay(state->goal);
 239         Window goal = XtWindow(state->goal);
 240         unsigned sz = state->goal_tile_sz;
 241         unsigned long ewmhseq[9];
 242         int i;
 243
 244         uint_least32_t gp[3] = {
 245                 state->board.goal[0],
 246                 state->board.goal[1],
 247                 state->board.goal[2]
 248         };
 249
 250         for (i = 0; i < 9; i++) {
 251                 int x = i%3, y = i/3;
 252
 253                 if (icon_shell) {
 254                         unsigned tile;
 255
 256                         tile = redraw_tile(state, display, state->icon_pixmap,
 257                                            gp, x, y, ICON_SIZE/3);
 258                         ewmhseq[i] = COLOUR_MAX*0x10101 * (tile-1) + 0x20100;
 259                 }
 260
 261                 if (mask & 1)
 262                         redraw_tile(state, display, goal, gp, x, y, sz);
 263
 264                 /*
 265                  * Goal bitmaps have a gap of 2 tiles between each row.
 266                  * This funny shift will accomodate that.
 267                  */
 268                 mask >>= 1|x;
 269         }
 270
 271         if (icon_shell)
 272                 set_icon(state, display, icon_shell, ewmhseq);
 273 }
 274
 275 void x11_redraw_game(struct app_state *state, uint_fast32_t mask)
 276 {
 277         Display *display = XtDisplay(state->goal);
 278         Window game = XtWindow(state->game);
 279         uint_least32_t buf[3], *gp = state->board.game;
 280         unsigned sz = state->game_tile_sz;
 281         int i;
 282
 283         if (state->view_goal_on_game) {
 284                 for (i = 0; i < 3; i++) {
 285                         buf[i] = state->board.goal[i];
 286                         buf[i] = (gp[i] & ~GOAL_MASK) | (buf[i] << GOAL_SHIFT);
 287                 }
 288                 gp = buf;
 289         }
 290
 291         /* Optimize the game end case where the outer frame is cleared */
 292         if (((gp[0] | gp[1] | gp[2]) & ~GOAL_MASK) == 0) {
 293                 clear_border(display, game, sz);
 294                 mask &= GOAL_MASK;
 295         }
 296
 297         for (i = 0; i < 25; i++) {
 298                 if (mask & 1)
 299                         redraw_tile(state, display, game, gp, i%5, i/5, sz);
 300                 mask >>= 1;
 301         }
 302 }
 303
 304 /*
 305  * Deferred redraw of tiles after resize/expose to avoid redundant drawing.
 306  *
 307  * Record any tiles that need to be redrawn due to resizes or expose events,
 308  * then, after a short delay, perform all the accumulated redraws at once.
 309  *
 310  * This is implemented using both a work proc and a timeout, because it seems
 311  * that rendering directly inside the timeout callback gives poor results:
 312  * possibly redrawing outdated intermediate positions during "fast" resizes
 313  * long after the resizing has stopped.  This does not happen when drawing
 314  * from a work proc.
 315  */
 316 static Boolean do_render(void *data)
 317 {
 318         struct app_state *state = data;
 319
 320         x11_redraw_goal(state, state->render_goal_mask, NULL);
 321         x11_redraw_game(state, state->render_game_mask);
 322
 323         state->render_goal_mask = state->render_game_mask = 0;
 324         state->render_proc = 0;
 325         state->render_tick = 0;
 326         return True;
 327 }
 328
 329 static void start_render(void *data, XtIntervalId *id)
 330 {
 331         struct app_state *state = data;
 332         XtAppContext app;
 333
 334         if (state->render_proc)
 335                 return;
 336
 337         app = XtWidgetToApplicationContext(state->game);
 338         state->render_proc = XtAppAddWorkProc(app, do_render, state);
 339 }
 340
 341 void x11_queue_render(struct app_state *state, uint_fast32_t mask, int mode)
 342 {
 343         uint_fast32_t changed = 0;
 344         XtAppContext app;
 345
 346         if (mode & RENDER_MODE_GOAL)
 347                 changed |= state->render_goal_mask |= mask;
 348         if (mode & RENDER_MODE_GAME)
 349                 changed |= state->render_game_mask |= mask;
 350
 351         if (state->render_tick || !changed)
 352                 return;
 353
 354         app = XtWidgetToApplicationContext(state->game);
 355         state->render_tick = XtAppAddTimeOut(app, 3, start_render, state);
 356 }