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, 1999, 2001, 2002, 2003,
   3                  2004, 2005, 2006, 2007  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 #include <config.h>
  23 #include <signal.h>
  24 #include <stdio.h>
  25 #include "lisp.h"
  26 #include "keyboard.h"
  27 #include "frame.h"
  28 #include "charset.h"
  29 #include "fontset.h"
  30 #include "blockinput.h"
  31 #include "w32term.h"
  32 #include "windowsx.h"
  33
  34 #define myalloc(cb) GlobalAllocPtr (GPTR, cb)
  35 #define myfree(lp) GlobalFreePtr (lp)
  36
  37 CRITICAL_SECTION critsect;
  38 extern HANDLE keyboard_handle;
  39 HANDLE input_available = NULL;
  40 HANDLE interrupt_handle = NULL;
  41
  42 void
  43 init_crit ()
  44 {
  45   InitializeCriticalSection (&critsect);
  46
  47   /* For safety, input_available should only be reset by get_next_msg
  48      when the input queue is empty, so make it a manual reset event. */
  49   keyboard_handle = input_available = CreateEvent (NULL, TRUE, FALSE, NULL);
  50
  51   /* interrupt_handle is signalled when quit (C-g) is detected, so that
  52      blocking system calls can be interrupted.  We make it a manual
  53      reset event, so that if we should ever have multiple threads
  54      performing system calls, they will all be interrupted (I'm guessing
  55      that would the right response).  Note that we use PulseEvent to
  56      signal this event, so that it never remains signalled.  */
  57   interrupt_handle = CreateEvent (NULL, TRUE, FALSE, NULL);
  58 }
  59
  60 void
  61 delete_crit ()
  62 {
  63   DeleteCriticalSection (&critsect);
  64
  65   if (input_available)
  66     {
  67       CloseHandle (input_available);
  68       input_available = NULL;
  69     }
  70   if (interrupt_handle)
  71     {
  72       CloseHandle (interrupt_handle);
  73       interrupt_handle = NULL;
  74     }
  75 }
  76
  77 void
  78 signal_quit ()
  79 {
  80   /* Make sure this event never remains signalled; if the main thread
  81      isn't in a blocking call, then this should do nothing.  */
  82   PulseEvent (interrupt_handle);
  83 }
  84
  85 void
  86 select_palette (FRAME_PTR f, HDC hdc)
  87 {
  88   struct w32_display_info *display_info = FRAME_W32_DISPLAY_INFO (f);
  89
  90   if (!display_info->has_palette)
  91     return;
  92
  93   if (display_info->palette == 0)
  94     return;
  95
  96   if (!NILP (Vw32_enable_palette))
  97     f->output_data.w32->old_palette =
  98       SelectPalette (hdc, display_info->palette, FALSE);
  99   else
 100     f->output_data.w32->old_palette = NULL;
 101
 102   if (RealizePalette (hdc))
 103   {
 104     Lisp_Object frame, framelist;
 105     FOR_EACH_FRAME (framelist, frame)
 106     {
 107       SET_FRAME_GARBAGED (XFRAME (frame));
 108     }
 109   }
 110 }
 111
 112 void
 113 deselect_palette (FRAME_PTR f, HDC hdc)
 114 {
 115   if (f->output_data.w32->old_palette)
 116     SelectPalette (hdc, f->output_data.w32->old_palette, FALSE);
 117 }
 118
 119 /* Get a DC for frame and select palette for drawing; force an update of
 120    all frames if palette's mapping changes.  */
 121 HDC
 122 get_frame_dc (FRAME_PTR f)
 123 {
 124   HDC hdc;
 125
 126   if (f->output_method != output_w32)
 127     abort ();
 128
 129   enter_crit ();
 130
 131   hdc = GetDC (f->output_data.w32->window_desc);
 132
 133   /* If this gets called during startup before the frame is valid,
 134      there is a chance of corrupting random data or crashing. */
 135   if (hdc)
 136     select_palette (f, hdc);
 137
 138   return hdc;
 139 }
 140
 141 int
 142 release_frame_dc (FRAME_PTR f, HDC hdc)
 143 {
 144   int ret;
 145
 146   deselect_palette (f, hdc);
 147   ret = ReleaseDC (f->output_data.w32->window_desc, hdc);
 148
 149   leave_crit ();
 150
 151   return ret;
 152 }
 153
 154 typedef struct int_msg
 155 {
 156   W32Msg w32msg;
 157   struct int_msg *lpNext;
 158 } int_msg;
 159
 160 int_msg *lpHead = NULL;
 161 int_msg *lpTail = NULL;
 162 int nQueue = 0;
 163
 164 BOOL
 165 get_next_msg (lpmsg, bWait)
 166      W32Msg * lpmsg;
 167      BOOL bWait;
 168 {
 169   BOOL bRet = FALSE;
 170
 171   enter_crit ();
 172
 173   /* The while loop takes care of multiple sets */
 174
 175   while (!nQueue && bWait)
 176     {
 177       leave_crit ();
 178       WaitForSingleObject (input_available, INFINITE);
 179       enter_crit ();
 180     }
 181
 182   if (nQueue)
 183     {
 184       bcopy (&(lpHead->w32msg), lpmsg, sizeof (W32Msg));
 185
 186       {
 187         int_msg * lpCur = lpHead;
 188
 189         lpHead = lpHead->lpNext;
 190
 191         myfree (lpCur);
 192       }
 193
 194       nQueue--;
 195
 196       bRet = TRUE;
 197     }
 198
 199   if (nQueue == 0)
 200     ResetEvent (input_available);
 201
 202   leave_crit ();
 203
 204   return (bRet);
 205 }
 206
 207 BOOL
 208 post_msg (lpmsg)
 209      W32Msg * lpmsg;
 210 {
 211   int_msg * lpNew = (int_msg *) myalloc (sizeof (int_msg));
 212
 213   if (!lpNew)
 214     return (FALSE);
 215
 216   bcopy (lpmsg, &(lpNew->w32msg), sizeof (W32Msg));
 217   lpNew->lpNext = NULL;
 218
 219   enter_crit ();
 220
 221   if (nQueue++)
 222     {
 223       lpTail->lpNext = lpNew;
 224     }
 225   else
 226     {
 227       lpHead = lpNew;
 228     }
 229
 230   lpTail = lpNew;
 231   SetEvent (input_available);
 232
 233   leave_crit ();
 234
 235   return (TRUE);
 236 }
 237
 238 BOOL
 239 prepend_msg (W32Msg *lpmsg)
 240 {
 241   int_msg * lpNew = (int_msg *) myalloc (sizeof (int_msg));
 242
 243   if (!lpNew)
 244     return (FALSE);
 245
 246   bcopy (lpmsg, &(lpNew->w32msg), sizeof (W32Msg));
 247
 248   enter_crit ();
 249
 250   nQueue++;
 251   lpNew->lpNext = lpHead;
 252   lpHead = lpNew;
 253
 254   leave_crit ();
 255
 256   return (TRUE);
 257 }
 258
 259 /* Process all messages in the current thread's queue.  */
 260 void
 261 drain_message_queue ()
 262 {
 263   MSG msg;
 264   while (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
 265     {
 266       TranslateMessage (&msg);
 267       DispatchMessage (&msg);
 268     }
 269 }
 270
 271
 272 /*
 273  *    XParseGeometry parses strings of the form
 274  *   "=<width>x<height>{+-}<xoffset>{+-}<yoffset>", where
 275  *   width, height, xoffset, and yoffset are unsigned integers.
 276  *   Example:  "=80x24+300-49"
 277  *   The equal sign is optional.
 278  *   It returns a bitmask that indicates which of the four values
 279  *   were actually found in the string.  For each value found,
 280  *   the corresponding argument is updated;  for each value
 281  *   not found, the corresponding argument is left unchanged.
 282  */
 283
 284 static int
 285 read_integer (string, NextString)
 286      register char *string;
 287      char **NextString;
 288 {
 289   register int Result = 0;
 290   int Sign = 1;
 291
 292   if (*string == '+')
 293     string++;
 294   else if (*string == '-')
 295     {
 296       string++;
 297       Sign = -1;
 298     }
 299   for (; (*string >= '0') && (*string <= '9'); string++)
 300     {
 301       Result = (Result * 10) + (*string - '0');
 302     }
 303   *NextString = string;
 304   if (Sign >= 0)
 305     return (Result);
 306   else
 307     return (-Result);
 308 }
 309
 310 int
 311 XParseGeometry (string, x, y, width, height)
 312      char *string;
 313      int *x, *y;
 314      unsigned int *width, *height;    /* RETURN */
 315 {
 316   int mask = NoValue;
 317   register char *strind;
 318   unsigned int tempWidth, tempHeight;
 319   int tempX, tempY;
 320   char *nextCharacter;
 321
 322   if ((string == NULL) || (*string == '\0')) return (mask);
 323   if (*string == '=')
 324     string++;  /* ignore possible '=' at beg of geometry spec */
 325
 326   strind = (char *)string;
 327   if (*strind != '+' && *strind != '-' && *strind != 'x')
 328     {
 329       tempWidth = read_integer (strind, &nextCharacter);
 330       if (strind == nextCharacter)
 331         return (0);
 332       strind = nextCharacter;
 333       mask |= WidthValue;
 334     }
 335
 336   if (*strind == 'x' || *strind == 'X')
 337     {
 338       strind++;
 339       tempHeight = read_integer (strind, &nextCharacter);
 340       if (strind == nextCharacter)
 341         return (0);
 342       strind = nextCharacter;
 343       mask |= HeightValue;
 344     }
 345
 346   if ((*strind == '+') || (*strind == '-'))
 347     {
 348       if (*strind == '-')
 349         {
 350           strind++;
 351           tempX = -read_integer (strind, &nextCharacter);
 352           if (strind == nextCharacter)
 353             return (0);
 354           strind = nextCharacter;
 355           mask |= XNegative;
 356
 357         }
 358       else
 359         {
 360           strind++;
 361           tempX = read_integer (strind, &nextCharacter);
 362           if (strind == nextCharacter)
 363             return (0);
 364           strind = nextCharacter;
 365         }
 366       mask |= XValue;
 367       if ((*strind == '+') || (*strind == '-'))
 368         {
 369           if (*strind == '-')
 370             {
 371               strind++;
 372               tempY = -read_integer (strind, &nextCharacter);
 373               if (strind == nextCharacter)
 374                 return (0);
 375               strind = nextCharacter;
 376               mask |= YNegative;
 377
 378             }
 379           else
 380             {
 381               strind++;
 382               tempY = read_integer (strind, &nextCharacter);
 383               if (strind == nextCharacter)
 384                 return (0);
 385               strind = nextCharacter;
 386             }
 387           mask |= YValue;
 388         }
 389     }
 390
 391   /* If strind isn't at the end of the string the it's an invalid
 392      geometry specification. */
 393
 394   if (*strind != '\0') return (0);
 395
 396   if (mask & XValue)
 397     *x = tempX;
 398   if (mask & YValue)
 399     *y = tempY;
 400   if (mask & WidthValue)
 401     *width = tempWidth;
 402   if (mask & HeightValue)
 403     *height = tempHeight;
 404   return (mask);
 405 }
 406
 407 /* x_sync is a no-op on W32.  */
 408 void
 409 x_sync (f)
 410      void *f;
 411 {
 412 }
 413
 414 /* arch-tag: 4fab3695-4ad3-4cc6-a2b1-fd2c67dc46be
 415    (do not change this comment) */