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_Context *context)
  33 {
  34         GP_Pixel white_pixel, black_pixel;
  35
  36         black_pixel = GP_RGBToContextPixel(0x00, 0x00, 0x00, context);
  37         white_pixel = GP_RGBToContextPixel(0xff, 0xff, 0xff, context);
  38
  39         GP_Fill(context, black_pixel);
  40         GP_Line(context, 0, 0, context->w - 1, context->h - 1, white_pixel);
  41         GP_Line(context, 0, context->h - 1, context->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                         break;
  72                         case GP_EV_SYS_QUIT:
  73                                 GP_BackendExit(backend);
  74                                 return 1;
  75                         break;
  76                         }
  77                 break;
  78                 }
  79
  80                 printf("-----------------------------\n");
  81         }
  82
  83         return 0;
  84 }
  85
  86 int main(void)
  87 {
  88         GP_Backend *win_1, *win_2;
  89
  90         win_1 = GP_BackendX11Init(NULL, 0, 0, 300, 300, "win 1", 0);
  91         win_2 = GP_BackendX11Init(NULL, 0, 0, 300, 300, "win 2", 0);
  92
  93         if (win_1 == NULL || win_2 == NULL) {
  94                 GP_BackendExit(win_1);
  95                 GP_BackendExit(win_2);
  96                 return 1;
  97         }
  98
  99         /* Update the backend screen */
 100         redraw(win_1->context);
 101         redraw(win_2->context);
 102
 103         GP_BackendFlip(win_1);
 104         GP_BackendFlip(win_2);
 105
 106         for (;;) {
 107                 /*
 108                  * Wait for backend event.
 109                  *
 110                  * Either window is fine as they share connection.
 111                  */
 112                 GP_Backend *b = win_1 ? win_1 : win_2;
 113
 114                 if (b == NULL)
 115                         return 0;
 116
 117                 GP_BackendWait(b);
 118
 119                 if (ev_loop(win_1, "win 1"))
 120                         win_1 = NULL;
 121
 122                 if (ev_loop(win_2, "win 2"))
 123                         win_2 = NULL;
 124         }
 125
 126         GP_BackendExit(win_1);
 127         GP_BackendExit(win_2);
 128
 129         return 0;
 130 }