src/w32xfns.c

   1 /* Functions taken directly from X sources for use with the Microsoft W32 API.
   2    Copyright (C) 1989, 1992-1995, 1999, 2001-2012  Free Software Foundation, Inc.
   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 3 of the License, or
   9 (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include <config.h>
  20 #include <signal.h>
  21 #include <stdio.h>
  22 #include <setjmp.h>
  23 #include "lisp.h"
  24 #include "keyboard.h"
  25 #include "frame.h"
  26 #include "charset.h"
  27 #include "fontset.h"
  28 #include "blockinput.h"
  29 #include "w32term.h"
  30 #include "windowsx.h"
  31
  32 #define myalloc(cb) GlobalAllocPtr (GPTR, cb)
  33 #define myfree(lp) GlobalFreePtr (lp)
  34
  35 CRITICAL_SECTION critsect;
  36 extern HANDLE keyboard_handle;
  37 HANDLE input_available = NULL;
  38 HANDLE interrupt_handle = NULL;
  39
  40 void
  41 init_crit (void)
  42 {
  43   InitializeCriticalSection (&critsect);
  44
  45   /* For safety, input_available should only be reset by get_next_msg
  46      when the input queue is empty, so make it a manual reset event. */
  47   keyboard_handle = input_available = CreateEvent (NULL, TRUE, FALSE, NULL);
  48
  49   /* interrupt_handle is signaled when quit (C-g) is detected, so that
  50      blocking system calls can be interrupted.  We make it a manual
  51      reset event, so that if we should ever have multiple threads
  52      performing system calls, they will all be interrupted (I'm guessing
  53      that would the right response).  Note that we use PulseEvent to
  54      signal this event, so that it never remains signaled.  */
  55   interrupt_handle = CreateEvent (NULL, TRUE, FALSE, NULL);
  56 }
  57
  58 void
  59 delete_crit (void)
  60 {
  61   DeleteCriticalSection (&critsect);
  62
  63   if (input_available)
  64     {
  65       CloseHandle (input_available);
  66       input_available = NULL;
  67     }
  68   if (interrupt_handle)
  69     {
  70       CloseHandle (interrupt_handle);
  71       interrupt_handle = NULL;
  72     }
  73 }
  74
  75 void
  76 signal_quit (void)
  77 {
  78   /* Make sure this event never remains signaled; if the main thread
  79      isn't in a blocking call, then this should do nothing.  */
  80   PulseEvent (interrupt_handle);
  81 }
  82
  83 void
  84 select_palette (FRAME_PTR f, HDC hdc)
  85 {
  86   struct w32_display_info *display_info = FRAME_W32_DISPLAY_INFO (f);
  87
  88   if (!display_info->has_palette)
  89     return;
  90
  91   if (display_info->palette == 0)
  92     return;
  93
  94   if (!NILP (Vw32_enable_palette))
  95     f->output_data.w32->old_palette =
  96       SelectPalette (hdc, display_info->palette, FALSE);
  97   else
  98     f->output_data.w32->old_palette = NULL;
  99
 100   if (RealizePalette (hdc) != GDI_ERROR)
 101   {
 102     Lisp_Object frame, framelist;
 103     FOR_EACH_FRAME (framelist, frame)
 104     {
 105       SET_FRAME_GARBAGED (XFRAME (frame));
 106     }
 107   }
 108 }
 109
 110 void
 111 deselect_palette (FRAME_PTR f, HDC hdc)
 112 {
 113   if (f->output_data.w32->old_palette)
 114     SelectPalette (hdc, f->output_data.w32->old_palette, FALSE);
 115 }
 116
 117 /* Get a DC for frame and select palette for drawing; force an update of
 118    all frames if palette's mapping changes.  */
 119 HDC
 120 get_frame_dc (FRAME_PTR f)
 121 {
 122   HDC hdc;
 123
 124   if (f->output_method != output_w32)
 125     abort ();
 126
 127   enter_crit ();
 128
 129   hdc = GetDC (f->output_data.w32->window_desc);
 130
 131   /* If this gets called during startup before the frame is valid,
 132      there is a chance of corrupting random data or crashing. */
 133   if (hdc)
 134     select_palette (f, hdc);
 135
 136   return hdc;
 137 }
 138
 139 int
 140 release_frame_dc (FRAME_PTR f, HDC hdc)
 141 {
 142   int ret;
 143
 144   deselect_palette (f, hdc);
 145   ret = ReleaseDC (f->output_data.w32->window_desc, hdc);
 146
 147   leave_crit ();
 148
 149   return ret;
 150 }
 151
 152 typedef struct int_msg
 153 {
 154   W32Msg w32msg;
 155   struct int_msg *lpNext;
 156 } int_msg;
 157
 158 int_msg *lpHead = NULL;
 159 int_msg *lpTail = NULL;
 160 int nQueue = 0;
 161
 162 BOOL
 163 get_next_msg (W32Msg * lpmsg, BOOL bWait)
 164 {
 165   BOOL bRet = FALSE;
 166
 167   enter_crit ();
 168
 169   /* The while loop takes care of multiple sets */
 170
 171   while (!nQueue && bWait)
 172     {
 173       leave_crit ();
 174       WaitForSingleObject (input_available, INFINITE);
 175       enter_crit ();
 176     }
 177
 178   if (nQueue)
 179     {
 180       memcpy (lpmsg, &lpHead->w32msg, sizeof (W32Msg));
 181
 182       {
 183         int_msg * lpCur = lpHead;
 184
 185         lpHead = lpHead->lpNext;
 186
 187         myfree (lpCur);
 188       }
 189
 190       nQueue--;
 191       /* Consolidate WM_PAINT messages to optimize redrawing.  */
 192       if (lpmsg->msg.message == WM_PAINT && nQueue)
 193         {
 194           int_msg * lpCur = lpHead;
 195           int_msg * lpPrev = NULL;
 196           int_msg * lpNext = NULL;
 197
 198           while (lpCur && nQueue)
 199             {
 200               lpNext = lpCur->lpNext;
 201               if (lpCur->w32msg.msg.message == WM_PAINT)
 202                 {
 203                   /* Remove this message from the queue.  */
 204                   if (lpPrev)
 205                     lpPrev->lpNext = lpNext;
 206                   else
 207                     lpHead = lpNext;
 208
 209                   if (lpCur == lpTail)
 210                     lpTail = lpPrev;
 211
 212                   /* Adjust clip rectangle to cover both.  */
 213                   if (!UnionRect (&(lpmsg->rect), &(lpmsg->rect),
 214                                   &(lpCur->w32msg.rect)))
 215                     {
 216                       SetRectEmpty (&(lpmsg->rect));
 217                     }
 218
 219                   myfree (lpCur);
 220
 221                   nQueue--;
 222
 223                   lpCur = lpNext;
 224                 }
 225               else
 226                 {
 227                   lpPrev = lpCur;
 228                   lpCur = lpNext;
 229                 }
 230             }
 231         }
 232
 233       bRet = TRUE;
 234     }
 235
 236   if (nQueue == 0)
 237     ResetEvent (input_available);
 238
 239   leave_crit ();
 240
 241   return (bRet);
 242 }
 243
 244 BOOL
 245 post_msg (W32Msg * lpmsg)
 246 {
 247   int_msg * lpNew = (int_msg *) myalloc (sizeof (int_msg));
 248
 249   if (!lpNew)
 250     return (FALSE);
 251
 252   memcpy (&lpNew->w32msg, lpmsg, sizeof (W32Msg));
 253   lpNew->lpNext = NULL;
 254
 255   enter_crit ();
 256
 257   if (nQueue++)
 258     {
 259       lpTail->lpNext = lpNew;
 260     }
 261   else
 262     {
 263       lpHead = lpNew;
 264     }
 265
 266   lpTail = lpNew;
 267   SetEvent (input_available);
 268
 269   leave_crit ();
 270
 271   return (TRUE);
 272 }
 273
 274 BOOL
 275 prepend_msg (W32Msg *lpmsg)
 276 {
 277   int_msg * lpNew = (int_msg *) myalloc (sizeof (int_msg));
 278
 279   if (!lpNew)
 280     return (FALSE);
 281
 282   memcpy (&lpNew->w32msg, lpmsg, sizeof (W32Msg));
 283
 284   enter_crit ();
 285
 286   nQueue++;
 287   lpNew->lpNext = lpHead;
 288   lpHead = lpNew;
 289
 290   leave_crit ();
 291
 292   return (TRUE);
 293 }
 294
 295 /* Process all messages in the current thread's queue.  */
 296 void
 297 drain_message_queue (void)
 298 {
 299   MSG msg;
 300   while (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
 301     {
 302       TranslateMessage (&msg);
 303       DispatchMessage (&msg);
 304     }
 305 }
 306
 307
 308 /*
 309  *    XParseGeometry parses strings of the form
 310  *   "=<width>x<height>{+-}<xoffset>{+-}<yoffset>", where
 311  *   width, height, xoffset, and yoffset are unsigned integers.
 312  *   Example:  "=80x24+300-49"
 313  *   The equal sign is optional.
 314  *   It returns a bitmask that indicates which of the four values
 315  *   were actually found in the string.  For each value found,
 316  *   the corresponding argument is updated;  for each value
 317  *   not found, the corresponding argument is left unchanged.
 318  */
 319
 320 static int
 321 read_integer (register char *string, char **NextString)
 322 {
 323   register int Result = 0;
 324   int Sign = 1;
 325
 326   if (*string == '+')
 327     string++;
 328   else if (*string == '-')
 329     {
 330       string++;
 331       Sign = -1;
 332     }
 333   for (; (*string >= '0') && (*string <= '9'); string++)
 334     {
 335       Result = (Result * 10) + (*string - '0');
 336     }
 337   *NextString = string;
 338   if (Sign >= 0)
 339     return (Result);
 340   else
 341     return (-Result);
 342 }
 343
 344 int
 345 XParseGeometry (char *string,
 346                 int *x, int *y,
 347                 unsigned int *width, unsigned int *height)
 348 {
 349   int mask = NoValue;
 350   register char *strind;
 351   unsigned int tempWidth, tempHeight;
 352   int tempX, tempY;
 353   char *nextCharacter;
 354
 355   if ((string == NULL) || (*string == '\0')) return (mask);
 356   if (*string == '=')
 357     string++;  /* ignore possible '=' at beg of geometry spec */
 358
 359   strind = (char *)string;
 360   if (*strind != '+' && *strind != '-' && *strind != 'x')
 361     {
 362       tempWidth = read_integer (strind, &nextCharacter);
 363       if (strind == nextCharacter)
 364         return (0);
 365       strind = nextCharacter;
 366       mask |= WidthValue;
 367     }
 368
 369   if (*strind == 'x' || *strind == 'X')
 370     {
 371       strind++;
 372       tempHeight = read_integer (strind, &nextCharacter);
 373       if (strind == nextCharacter)
 374         return (0);
 375       strind = nextCharacter;
 376       mask |= HeightValue;
 377     }
 378
 379   if ((*strind == '+') || (*strind == '-'))
 380     {
 381       if (*strind == '-')
 382         {
 383           strind++;
 384           tempX = -read_integer (strind, &nextCharacter);
 385           if (strind == nextCharacter)
 386             return (0);
 387           strind = nextCharacter;
 388           mask |= XNegative;
 389
 390         }
 391       else
 392         {
 393           strind++;
 394           tempX = read_integer (strind, &nextCharacter);
 395           if (strind == nextCharacter)
 396             return (0);
 397           strind = nextCharacter;
 398         }
 399       mask |= XValue;
 400       if ((*strind == '+') || (*strind == '-'))
 401         {
 402           if (*strind == '-')
 403             {
 404               strind++;
 405               tempY = -read_integer (strind, &nextCharacter);
 406               if (strind == nextCharacter)
 407                 return (0);
 408               strind = nextCharacter;
 409               mask |= YNegative;
 410             }
 411           else
 412             {
 413               strind++;
 414               tempY = read_integer (strind, &nextCharacter);
 415               if (strind == nextCharacter)
 416                 return (0);
 417               strind = nextCharacter;
 418             }
 419           mask |= YValue;
 420         }
 421     }
 422
 423   /* If strind isn't at the end of the string then it's an invalid
 424      geometry specification. */
 425
 426   if (*strind != '\0') return (0);
 427
 428   if (mask & XValue)
 429     *x = tempX;
 430   if (mask & YValue)
 431     *y = tempY;
 432   if (mask & WidthValue)
 433     *width = tempWidth;
 434   if (mask & HeightValue)
 435     *height = tempHeight;
 436   return (mask);
 437 }
 438
 439 /* x_sync is a no-op on W32.  */
 440 void
 441 x_sync (void *f)
 442 {
 443 }