src/w32xfns.c

   1 /* Functions taken directly from X sources for use with the Microsoft W32 API.
   2    Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #include <signal.h>
  22 #include <config.h>
  23 #include <stdio.h>
  24 #include "lisp.h"
  25 #include "frame.h"
  26 #include "blockinput.h"
  27 #include "w32term.h"
  28 #include "windowsx.h"
  29
  30 #define myalloc(cb) GlobalAllocPtr (GPTR, cb)
  31 #define myfree(lp) GlobalFreePtr (lp)
  32
  33 CRITICAL_SECTION critsect;
  34 extern HANDLE keyboard_handle;
  35 HANDLE input_available = NULL;
  36
  37 void
  38 init_crit ()
  39 {
  40   InitializeCriticalSection (&critsect);
  41
  42   /* For safety, input_available should only be reset by get_next_msg
  43      when the input queue is empty, so make it a manual reset event. */
  44   keyboard_handle = input_available = CreateEvent (NULL, TRUE, FALSE, NULL);
  45 }
  46
  47 void
  48 delete_crit ()
  49 {
  50   DeleteCriticalSection (&critsect);
  51
  52   if (input_available)
  53     {
  54       CloseHandle (input_available);
  55       input_available = NULL;
  56     }
  57 }
  58
  59 void
  60 select_palette (FRAME_PTR f, HDC hdc)
  61 {
  62   if (!NILP (Vw32_enable_palette))
  63     f->output_data.w32->old_palette =
  64       SelectPalette (hdc, one_w32_display_info.palette, FALSE);
  65   else
  66     f->output_data.w32->old_palette = NULL;
  67
  68   if (RealizePalette (hdc))
  69   {
  70     Lisp_Object frame, framelist;
  71     FOR_EACH_FRAME (framelist, frame)
  72     {
  73       SET_FRAME_GARBAGED (XFRAME (frame));
  74     }
  75   }
  76 }
  77
  78 void
  79 deselect_palette (FRAME_PTR f, HDC hdc)
  80 {
  81   if (f->output_data.w32->old_palette)
  82     SelectPalette (hdc, f->output_data.w32->old_palette, FALSE);
  83 }
  84
  85 /* Get a DC for frame and select palette for drawing; force an update of
  86    all frames if palette's mapping changes.  */
  87 HDC
  88 get_frame_dc (FRAME_PTR f)
  89 {
  90   HDC hdc;
  91
  92   enter_crit ();
  93
  94   hdc = GetDC (f->output_data.w32->window_desc);
  95   select_palette (f, hdc);
  96
  97   return hdc;
  98 }
  99
 100 int
 101 release_frame_dc (FRAME_PTR f, HDC hdc)
 102 {
 103   int ret;
 104
 105   deselect_palette (f, hdc);
 106   ret = ReleaseDC (f->output_data.w32->window_desc, hdc);
 107
 108   leave_crit ();
 109
 110   return ret;
 111 }
 112
 113 typedef struct int_msg
 114 {
 115   W32Msg w32msg;
 116   struct int_msg *lpNext;
 117 } int_msg;
 118
 119 int_msg *lpHead = NULL;
 120 int_msg *lpTail = NULL;
 121 int nQueue = 0;
 122
 123 BOOL
 124 get_next_msg (lpmsg, bWait)
 125      W32Msg * lpmsg;
 126      BOOL bWait;
 127 {
 128   BOOL bRet = FALSE;
 129
 130   enter_crit ();
 131
 132   /* The while loop takes care of multiple sets */
 133
 134   while (!nQueue && bWait)
 135     {
 136       leave_crit ();
 137       WaitForSingleObject (input_available, INFINITE);
 138       enter_crit ();
 139     }
 140
 141   if (nQueue)
 142     {
 143       bcopy (&(lpHead->w32msg), lpmsg, sizeof (W32Msg));
 144
 145       {
 146         int_msg * lpCur = lpHead;
 147
 148         lpHead = lpHead->lpNext;
 149
 150         myfree (lpCur);
 151       }
 152
 153       nQueue--;
 154
 155       bRet = TRUE;
 156     }
 157
 158   if (nQueue == 0)
 159     ResetEvent (input_available);
 160
 161   leave_crit ();
 162
 163   return (bRet);
 164 }
 165
 166 BOOL
 167 post_msg (lpmsg)
 168      W32Msg * lpmsg;
 169 {
 170   int_msg * lpNew = (int_msg *) myalloc (sizeof (int_msg));
 171
 172   if (!lpNew)
 173     return (FALSE);
 174
 175   bcopy (lpmsg, &(lpNew->w32msg), sizeof (W32Msg));
 176   lpNew->lpNext = NULL;
 177
 178   enter_crit ();
 179
 180   if (nQueue++)
 181     {
 182       lpTail->lpNext = lpNew;
 183     }
 184   else
 185     {
 186       lpHead = lpNew;
 187     }
 188
 189   lpTail = lpNew;
 190   SetEvent (input_available);
 191
 192   leave_crit ();
 193
 194   return (TRUE);
 195 }
 196
 197 BOOL
 198 prepend_msg (W32Msg *lpmsg)
 199 {
 200   int_msg * lpNew = (int_msg *) myalloc (sizeof (int_msg));
 201
 202   if (!lpNew)
 203     return (FALSE);
 204
 205   bcopy (lpmsg, &(lpNew->w32msg), sizeof (W32Msg));
 206
 207   enter_crit ();
 208
 209   nQueue++;
 210   lpNew->lpNext = lpHead;
 211   lpHead = lpNew;
 212
 213   leave_crit ();
 214
 215   return (TRUE);
 216 }
 217
 218 /*
 219  *    XParseGeometry parses strings of the form
 220  *   "=<width>x<height>{+-}<xoffset>{+-}<yoffset>", where
 221  *   width, height, xoffset, and yoffset are unsigned integers.
 222  *   Example:  "=80x24+300-49"
 223  *   The equal sign is optional.
 224  *   It returns a bitmask that indicates which of the four values
 225  *   were actually found in the string.  For each value found,
 226  *   the corresponding argument is updated;  for each value
 227  *   not found, the corresponding argument is left unchanged.
 228  */
 229
 230 static int
 231 read_integer (string, NextString)
 232      register char *string;
 233      char **NextString;
 234 {
 235   register int Result = 0;
 236   int Sign = 1;
 237
 238   if (*string == '+')
 239     string++;
 240   else if (*string == '-')
 241     {
 242       string++;
 243       Sign = -1;
 244     }
 245   for (; (*string >= '0') && (*string <= '9'); string++)
 246     {
 247       Result = (Result * 10) + (*string - '0');
 248     }
 249   *NextString = string;
 250   if (Sign >= 0)
 251     return (Result);
 252   else
 253     return (-Result);
 254 }
 255
 256 int
 257 XParseGeometry (string, x, y, width, height)
 258      char *string;
 259      int *x, *y;
 260      unsigned int *width, *height;    /* RETURN */
 261 {
 262   int mask = NoValue;
 263   register char *strind;
 264   unsigned int tempWidth, tempHeight;
 265   int tempX, tempY;
 266   char *nextCharacter;
 267
 268   if ((string == NULL) || (*string == '\0')) return (mask);
 269   if (*string == '=')
 270     string++;  /* ignore possible '=' at beg of geometry spec */
 271
 272   strind = (char *)string;
 273   if (*strind != '+' && *strind != '-' && *strind != 'x')
 274     {
 275       tempWidth = read_integer (strind, &nextCharacter);
 276       if (strind == nextCharacter)
 277         return (0);
 278       strind = nextCharacter;
 279       mask |= WidthValue;
 280     }
 281
 282   if (*strind == 'x' || *strind == 'X')
 283     {
 284       strind++;
 285       tempHeight = read_integer (strind, &nextCharacter);
 286       if (strind == nextCharacter)
 287         return (0);
 288       strind = nextCharacter;
 289       mask |= HeightValue;
 290     }
 291
 292   if ((*strind == '+') || (*strind == '-'))
 293     {
 294       if (*strind == '-')
 295         {
 296           strind++;
 297           tempX = -read_integer (strind, &nextCharacter);
 298           if (strind == nextCharacter)
 299             return (0);
 300           strind = nextCharacter;
 301           mask |= XNegative;
 302
 303         }
 304       else
 305         {
 306           strind++;
 307           tempX = read_integer (strind, &nextCharacter);
 308           if (strind == nextCharacter)
 309             return (0);
 310           strind = nextCharacter;
 311         }
 312       mask |= XValue;
 313       if ((*strind == '+') || (*strind == '-'))
 314         {
 315           if (*strind == '-')
 316             {
 317               strind++;
 318               tempY = -read_integer (strind, &nextCharacter);
 319               if (strind == nextCharacter)
 320                 return (0);
 321               strind = nextCharacter;
 322               mask |= YNegative;
 323
 324             }
 325           else
 326             {
 327               strind++;
 328               tempY = read_integer (strind, &nextCharacter);
 329               if (strind == nextCharacter)
 330                 return (0);
 331               strind = nextCharacter;
 332             }
 333           mask |= YValue;
 334         }
 335     }
 336
 337   /* If strind isn't at the end of the string the it's an invalid
 338      geometry specification. */
 339
 340   if (*strind != '\0') return (0);
 341
 342   if (mask & XValue)
 343     *x = tempX;
 344   if (mask & YValue)
 345     *y = tempY;
 346   if (mask & WidthValue)
 347     *width = tempWidth;
 348   if (mask & HeightValue)
 349     *height = tempHeight;
 350   return (mask);
 351 }
 352
 353 /* x_sync is a no-op on W32.  */
 354 void
 355 x_sync (f)
 356      void *f;
 357 {
 358 }
 359