demos/c_simple/x11_windows.c

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2013 Cyril Hrubis <metan@ucw.cz>                       *
  20  *                                                                           *
  21  *****************************************************************************/
  22
  23  /*
  24
  25    Simple backend example.
  26
  27   */
  28
  29 #include <stdio.h>
  30 #include <GP.h>
  31
  32 static void redraw(struct GP_Pixmap *pixmap)
  33 {
  34         GP_Pixel white_pixel, black_pixel;
  35
  36         black_pixel = GP_RGBToPixmapPixel(0x00, 0x00, 0x00, pixmap);
  37         white_pixel = GP_RGBToPixmapPixel(0xff, 0xff, 0xff, pixmap);
  38
  39         GP_Fill(pixmap, black_pixel);
  40         GP_Line(pixmap, 0, 0, pixmap->w - 1, pixmap->h - 1, white_pixel);
  41         GP_Line(pixmap, 0, pixmap->h - 1, pixmap->w - 1, 0, white_pixel);
  42 }
  43
  44 static int ev_loop(struct GP_Backend *backend, const char *name)
  45 {
  46         GP_Event ev;
  47
  48         if (backend == NULL)
  49                 return 0;
  50
  51         while (GP_BackendGetEvent(backend, &ev)) {
  52
  53                 printf("-------------------------- %s\n", name);
  54
  55                 GP_EventDump(&ev);
  56
  57                 switch (ev.type) {
  58                 case GP_EV_KEY:
  59                         switch (ev.val.val) {
  60                         case GP_KEY_ESC:
  61                         case GP_KEY_Q:
  62                                 GP_BackendExit(backend);
  63                                 return 1;
  64                         break;
  65                         }
  66                 break;
  67                 case GP_EV_SYS:
  68                         switch (ev.code) {
  69                         case GP_EV_SYS_RESIZE:
  70                                 GP_BackendResizeAck(backend);
  71                                 redraw(backend->pixmap);
  72                                 GP_BackendFlip(backend);
  73                         break;
  74                         case GP_EV_SYS_QUIT:
  75                                 GP_BackendExit(backend);
  76                                 return 1;
  77                         break;
  78                         }
  79                 break;
  80                 }
  81
  82                 printf("-----------------------------\n");
  83         }
  84
  85         return 0;
  86 }
  87
  88 int main(void)
  89 {
  90         GP_Backend *win_1, *win_2;
  91
  92         win_1 = GP_BackendX11Init(NULL, 0, 0, 300, 300, "win 1", 0);
  93         win_2 = GP_BackendX11Init(NULL, 0, 0, 300, 300, "win 2", 0);
  94
  95         if (win_1 == NULL || win_2 == NULL) {
  96                 GP_BackendExit(win_1);
  97                 GP_BackendExit(win_2);
  98                 return 1;
  99         }
 100
 101         /* Update the backend screen */
 102         redraw(win_1->pixmap);
 103         redraw(win_2->pixmap);
 104
 105         GP_BackendFlip(win_1);
 106         GP_BackendFlip(win_2);
 107
 108         for (;;) {
 109                 /*
 110                  * Wait for backend event.
 111                  *
 112                  * Either window is fine as they share connection.
 113                  */
 114                 GP_Backend *b = win_1 ? win_1 : win_2;
 115
 116                 if (b == NULL)
 117                         return 0;
 118
 119                 GP_BackendWait(b);
 120
 121                 if (ev_loop(win_1, "win 1"))
 122                         win_1 = NULL;
 123
 124                 if (ev_loop(win_2, "win 2"))
 125                         win_2 = NULL;
 126         }
 127
 128         GP_BackendExit(win_1);
 129         GP_BackendExit(win_2);
 130
 131         return 0;
 132 }