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, 2008, 2009, 2010  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 3 of the License, or
  10 (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include <config.h>
  21 #include <signal.h>
  22 #include <stdio.h>
  23 #include <setjmp.h>
  24 #include "lisp.h"
  25 #include "keyboard.h"
  26 #include "frame.h"
  27 #include "charset.h"
  28 #include "fontset.h"
  29 #include "blockinput.h"
  30 #include "w32term.h"
  31 #include "windowsx.h"
  32
  33 #define myalloc(cb) GlobalAllocPtr (GPTR, cb)
  34 #define myfree(lp) GlobalFreePtr (lp)
  35
  36 CRITICAL_SECTION critsect;
  37 extern HANDLE keyboard_handle;
  38 HANDLE input_available = NULL;
  39 HANDLE interrupt_handle = NULL;
  40
  41 void
  42 init_crit ()
  43 {
  44   InitializeCriticalSection (&critsect);
  45
  46   /* For safety, input_available should only be reset by get_next_msg
  47      when the input queue is empty, so make it a manual reset event. */
  48   keyboard_handle = input_available = CreateEvent (NULL, TRUE, FALSE, NULL);
  49
  50   /* interrupt_handle is signaled when quit (C-g) is detected, so that
  51      blocking system calls can be interrupted.  We make it a manual
  52      reset event, so that if we should ever have multiple threads
  53      performing system calls, they will all be interrupted (I'm guessing
  54      that would the right response).  Note that we use PulseEvent to
  55      signal this event, so that it never remains signaled.  */
  56   interrupt_handle = CreateEvent (NULL, TRUE, FALSE, NULL);
  57 }
  58
  59 void
  60 delete_crit ()
  61 {
  62   DeleteCriticalSection (&critsect);
  63
  64   if (input_available)
  65     {
  66       CloseHandle (input_available);
  67       input_available = NULL;
  68     }
  69   if (interrupt_handle)
  70     {
  71       CloseHandle (interrupt_handle);
  72       interrupt_handle = NULL;
  73     }
  74 }
  75
  76 void
  77 signal_quit ()
  78 {
  79   /* Make sure this event never remains signaled; if the main thread
  80      isn't in a blocking call, then this should do nothing.  */
  81   PulseEvent (interrupt_handle);
  82 }
  83
  84 void
  85 select_palette (FRAME_PTR f, HDC hdc)
  86 {
  87   struct w32_display_info *display_info = FRAME_W32_DISPLAY_INFO (f);
  88
  89   if (!display_info->has_palette)
  90     return;
  91
  92   if (display_info->palette == 0)
  93     return;
  94
  95   if (!NILP (Vw32_enable_palette))
  96     f->output_data.w32->old_palette =
  97       SelectPalette (hdc, display_info->palette, FALSE);
  98   else
  99     f->output_data.w32->old_palette = NULL;
 100
 101   if (RealizePalette (hdc))
 102   {
 103     Lisp_Object frame, framelist;
 104     FOR_EACH_FRAME (framelist, frame)
 105     {
 106       SET_FRAME_GARBAGED (XFRAME (frame));
 107     }
 108   }
 109 }
 110
 111 void
 112 deselect_palette (FRAME_PTR f, HDC hdc)
 113 {
 114   if (f->output_data.w32->old_palette)
 115     SelectPalette (hdc, f->output_data.w32->old_palette, FALSE);
 116 }
 117
 118 /* Get a DC for frame and select palette for drawing; force an update of
 119    all frames if palette's mapping changes.  */
 120 HDC
 121 get_frame_dc (FRAME_PTR f)
 122 {
 123   HDC hdc;
 124
 125   if (f->output_method != output_w32)
 126     abort ();
 127
 128   enter_crit ();
 129
 130   hdc = GetDC (f->output_data.w32->window_desc);
 131
 132   /* If this gets called during startup before the frame is valid,
 133      there is a chance of corrupting random data or crashing. */
 134   if (hdc)
 135     select_palette (f, hdc);
 136
 137   return hdc;
 138 }
 139
 140 int
 141 release_frame_dc (FRAME_PTR f, HDC hdc)
 142 {
 143   int ret;
 144
 145   deselect_palette (f, hdc);
 146   ret = ReleaseDC (f->output_data.w32->window_desc, hdc);
 147
 148   leave_crit ();
 149
 150   return ret;
 151 }
 152
 153 typedef struct int_msg
 154 {
 155   W32Msg w32msg;
 156   struct int_msg *lpNext;
 157 } int_msg;
 158
 159 int_msg *lpHead = NULL;
 160 int_msg *lpTail = NULL;
 161 int nQueue = 0;
 162
 163 BOOL
 164 get_next_msg (lpmsg, bWait)
 165      W32Msg * lpmsg;
 166      BOOL bWait;
 167 {
 168   BOOL bRet = FALSE;
 169
 170   enter_crit ();
 171
 172   /* The while loop takes care of multiple sets */
 173
 174   while (!nQueue && bWait)
 175     {
 176       leave_crit ();
 177       WaitForSingleObject (input_available, INFINITE);
 178       enter_crit ();
 179     }
 180
 181   if (nQueue)
 182     {
 183       bcopy (&(lpHead->w32msg), lpmsg, sizeof (W32Msg));
 184
 185       {
 186         int_msg * lpCur = lpHead;
 187
 188         lpHead = lpHead->lpNext;
 189
 190         myfree (lpCur);
 191       }
 192
 193       nQueue--;
 194       /* Consolidate WM_PAINT messages to optimise redrawing.  */
 195       if (lpmsg->msg.message == WM_PAINT && nQueue)
 196         {
 197           int_msg * lpCur = lpHead;
 198           int_msg * lpPrev = NULL;
 199           int_msg * lpNext = NULL;
 200
 201           while (lpCur && nQueue)
 202             {
 203               lpNext = lpCur->lpNext;
 204               if (lpCur->w32msg.msg.message == WM_PAINT)
 205                 {
 206                   /* Remove this message from the queue.  */
 207                   if (lpPrev)
 208                     lpPrev->lpNext = lpNext;
 209                   else
 210                     lpHead = lpNext;
 211
 212                   if (lpCur == lpTail)
 213                     lpTail = lpPrev;
 214
 215                   /* Adjust clip rectangle to cover both.  */
 216                   if (!UnionRect (&(lpmsg->rect), &(lpmsg->rect),
 217                                   &(lpCur->w32msg.rect)))
 218                     {
 219                       SetRectEmpty(&(lpmsg->rect));
 220                     }
 221
 222                   myfree (lpCur);
 223
 224                   nQueue--;
 225
 226                   lpCur = lpNext;
 227                 }
 228               else
 229                 {
 230                   lpPrev = lpCur;
 231                   lpCur = lpNext;
 232                 }
 233             }
 234         }
 235
 236       bRet = TRUE;
 237     }
 238
 239   if (nQueue == 0)
 240     ResetEvent (input_available);
 241
 242   leave_crit ();
 243
 244   return (bRet);
 245 }
 246
 247 BOOL
 248 post_msg (lpmsg)
 249      W32Msg * lpmsg;
 250 {
 251   int_msg * lpNew = (int_msg *) myalloc (sizeof (int_msg));
 252
 253   if (!lpNew)
 254     return (FALSE);
 255
 256   bcopy (lpmsg, &(lpNew->w32msg), sizeof (W32Msg));
 257   lpNew->lpNext = NULL;
 258
 259   enter_crit ();
 260
 261   if (nQueue++)
 262     {
 263       lpTail->lpNext = lpNew;
 264     }
 265   else
 266     {
 267       lpHead = lpNew;
 268     }
 269
 270   lpTail = lpNew;
 271   SetEvent (input_available);
 272
 273   leave_crit ();
 274
 275   return (TRUE);
 276 }
 277
 278 BOOL
 279 prepend_msg (W32Msg *lpmsg)
 280 {
 281   int_msg * lpNew = (int_msg *) myalloc (sizeof (int_msg));
 282
 283   if (!lpNew)
 284     return (FALSE);
 285
 286   bcopy (lpmsg, &(lpNew->w32msg), sizeof (W32Msg));
 287
 288   enter_crit ();
 289
 290   nQueue++;
 291   lpNew->lpNext = lpHead;
 292   lpHead = lpNew;
 293
 294   leave_crit ();
 295
 296   return (TRUE);
 297 }
 298
 299 /* Process all messages in the current thread's queue.  */
 300 void
 301 drain_message_queue ()
 302 {
 303   MSG msg;
 304   while (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
 305     {
 306       TranslateMessage (&msg);
 307       DispatchMessage (&msg);
 308     }
 309 }
 310
 311
 312 /*
 313  *    XParseGeometry parses strings of the form
 314  *   "=<width>x<height>{+-}<xoffset>{+-}<yoffset>", where
 315  *   width, height, xoffset, and yoffset are unsigned integers.
 316  *   Example:  "=80x24+300-49"
 317  *   The equal sign is optional.
 318  *   It returns a bitmask that indicates which of the four values
 319  *   were actually found in the string.  For each value found,
 320  *   the corresponding argument is updated;  for each value
 321  *   not found, the corresponding argument is left unchanged.
 322  */
 323
 324 static int
 325 read_integer (string, NextString)
 326      register char *string;
 327      char **NextString;
 328 {
 329   register int Result = 0;
 330   int Sign = 1;
 331
 332   if (*string == '+')
 333     string++;
 334   else if (*string == '-')
 335     {
 336       string++;
 337       Sign = -1;
 338     }
 339   for (; (*string >= '0') && (*string <= '9'); string++)
 340     {
 341       Result = (Result * 10) + (*string - '0');
 342     }
 343   *NextString = string;
 344   if (Sign >= 0)
 345     return (Result);
 346   else
 347     return (-Result);
 348 }
 349
 350 int
 351 XParseGeometry (string, x, y, width, height)
 352      char *string;
 353      int *x, *y;
 354      unsigned int *width, *height;    /* RETURN */
 355 {
 356   int mask = NoValue;
 357   register char *strind;
 358   unsigned int tempWidth, tempHeight;
 359   int tempX, tempY;
 360   char *nextCharacter;
 361
 362   if ((string == NULL) || (*string == '\0')) return (mask);
 363   if (*string == '=')
 364     string++;  /* ignore possible '=' at beg of geometry spec */
 365
 366   strind = (char *)string;
 367   if (*strind != '+' && *strind != '-' && *strind != 'x')
 368     {
 369       tempWidth = read_integer (strind, &nextCharacter);
 370       if (strind == nextCharacter)
 371         return (0);
 372       strind = nextCharacter;
 373       mask |= WidthValue;
 374     }
 375
 376   if (*strind == 'x' || *strind == 'X')
 377     {
 378       strind++;
 379       tempHeight = read_integer (strind, &nextCharacter);
 380       if (strind == nextCharacter)
 381         return (0);
 382       strind = nextCharacter;
 383       mask |= HeightValue;
 384     }
 385
 386   if ((*strind == '+') || (*strind == '-'))
 387     {
 388       if (*strind == '-')
 389         {
 390           strind++;
 391           tempX = -read_integer (strind, &nextCharacter);
 392           if (strind == nextCharacter)
 393             return (0);
 394           strind = nextCharacter;
 395           mask |= XNegative;
 396
 397         }
 398       else
 399         {
 400           strind++;
 401           tempX = read_integer (strind, &nextCharacter);
 402           if (strind == nextCharacter)
 403             return (0);
 404           strind = nextCharacter;
 405         }
 406       mask |= XValue;
 407       if ((*strind == '+') || (*strind == '-'))
 408         {
 409           if (*strind == '-')
 410             {
 411               strind++;
 412               tempY = -read_integer (strind, &nextCharacter);
 413               if (strind == nextCharacter)
 414                 return (0);
 415               strind = nextCharacter;
 416               mask |= YNegative;
 417
 418             }
 419           else
 420             {
 421               strind++;
 422               tempY = read_integer (strind, &nextCharacter);
 423               if (strind == nextCharacter)
 424                 return (0);
 425               strind = nextCharacter;
 426             }
 427           mask |= YValue;
 428         }
 429     }
 430
 431   /* If strind isn't at the end of the string the it's an invalid
 432      geometry specification. */
 433
 434   if (*strind != '\0') return (0);
 435
 436   if (mask & XValue)
 437     *x = tempX;
 438   if (mask & YValue)
 439     *y = tempY;
 440   if (mask & WidthValue)
 441     *width = tempWidth;
 442   if (mask & HeightValue)
 443     *height = tempHeight;
 444   return (mask);
 445 }
 446
 447 /* x_sync is a no-op on W32.  */
 448 void
 449 x_sync (f)
 450      void *f;
 451 {
 452 }
 453
 454 /* arch-tag: 4fab3695-4ad3-4cc6-a2b1-fd2c67dc46be
 455    (do not change this comment) */