unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob 29636d1de80820bc2cc8ce173a3d99975985e8da 7429 bytes (raw)
name: src/w32xfns.c 	 # note: path name is non-authoritative(*)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
 
/* Functions taken directly from X sources for use with the Microsoft Windows API.
   Copyright (C) 1989, 1992-1995, 1999, 2001-2016 Free Software
   Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

#include <config.h>
#include <signal.h>
#include <stdio.h>
#include <windows.h>
#include <windowsx.h>

#include "lisp.h"
#include "frame.h"
#include "w32term.h"

#define myalloc(cb) GlobalAllocPtr (GPTR, cb)
#define myfree(lp) GlobalFreePtr (lp)

CRITICAL_SECTION critsect;

#ifdef WINDOWSNT
extern HANDLE keyboard_handle;
#endif /* WINDOWSNT */

HANDLE input_available = NULL;
HANDLE interrupt_handle = NULL;

void
init_crit (void)
{
  InitializeCriticalSection (&critsect);

  /* For safety, input_available should only be reset by get_next_msg
     when the input queue is empty, so make it a manual reset event. */
  input_available = CreateEvent (NULL, TRUE, FALSE, NULL);

#ifdef WINDOWSNT
  keyboard_handle = input_available;
#endif /* WINDOWSNT */

  /* interrupt_handle is signaled when quit (C-g) is detected, so that
     blocking system calls can be interrupted.  We make it a manual
     reset event, so that if we should ever have multiple threads
     performing system calls, they will all be interrupted (I'm guessing
     that would the right response).  Note that we use PulseEvent to
     signal this event, so that it never remains signaled.  */
  interrupt_handle = CreateEvent (NULL, TRUE, FALSE, NULL);
}

void
delete_crit (void)
{
  DeleteCriticalSection (&critsect);

  if (input_available)
    {
      CloseHandle (input_available);
      input_available = NULL;
    }
  if (interrupt_handle)
    {
      CloseHandle (interrupt_handle);
      interrupt_handle = NULL;
    }
}

void
signal_quit (void)
{
  /* Make sure this event never remains signaled; if the main thread
     isn't in a blocking call, then this should do nothing.  */
  PulseEvent (interrupt_handle);
}

void
select_palette (struct frame *f, HDC hdc)
{
  struct w32_display_info *display_info = FRAME_DISPLAY_INFO (f);

  if (!display_info->has_palette)
    return;

  if (display_info->palette == 0)
    return;

  if (!NILP (Vw32_enable_palette))
    f->output_data.w32->old_palette =
      SelectPalette (hdc, display_info->palette, FALSE);
  else
    f->output_data.w32->old_palette = NULL;

  if (RealizePalette (hdc) != GDI_ERROR)
  {
    Lisp_Object frame, framelist;
    FOR_EACH_FRAME (framelist, frame)
    {
      SET_FRAME_GARBAGED (XFRAME (frame));
    }
  }
}

void
deselect_palette (struct frame *f, HDC hdc)
{
  if (f->output_data.w32->old_palette)
    SelectPalette (hdc, f->output_data.w32->old_palette, FALSE);
}

/* Get a DC for frame and select palette for drawing; force an update of
   all frames if palette's mapping changes.  */
HDC
get_frame_dc (struct frame *f)
{
  HDC hdc;

  if (f->output_method != output_w32)
    emacs_abort ();

  enter_crit ();

  hdc = GetDC (f->output_data.w32->window_desc);

  /* If this gets called during startup before the frame is valid,
     there is a chance of corrupting random data or crashing. */
  if (hdc)
    select_palette (f, hdc);

  return hdc;
}

int
release_frame_dc (struct frame *f, HDC hdc)
{
  int ret;

  deselect_palette (f, hdc);
  ret = ReleaseDC (f->output_data.w32->window_desc, hdc);

  leave_crit ();

  return ret;
}

typedef struct int_msg
{
  W32Msg w32msg;
  struct int_msg *lpNext;
} int_msg;

int_msg *lpHead = NULL;
int_msg *lpTail = NULL;
int nQueue = 0;

BOOL
get_next_msg (W32Msg * lpmsg, BOOL bWait)
{
  BOOL bRet = FALSE;

  enter_crit ();

  /* The while loop takes care of multiple sets */

  while (!nQueue && bWait)
    {
      leave_crit ();
      WaitForSingleObject (input_available, INFINITE);
      enter_crit ();
    }

  if (nQueue)
    {
      memcpy (lpmsg, &lpHead->w32msg, sizeof (W32Msg));

      {
	int_msg * lpCur = lpHead;

	lpHead = lpHead->lpNext;

	myfree (lpCur);
      }

      nQueue--;
      /* Consolidate WM_PAINT messages to optimize redrawing.  */
      if (lpmsg->msg.message == WM_PAINT && nQueue)
        {
          int_msg * lpCur = lpHead;
          int_msg * lpPrev = NULL;
          int_msg * lpNext = NULL;

          while (lpCur && nQueue)
            {
              lpNext = lpCur->lpNext;
              if (lpCur->w32msg.msg.message == WM_PAINT)
                {
                  /* Remove this message from the queue.  */
                  if (lpPrev)
                    lpPrev->lpNext = lpNext;
                  else
                    lpHead = lpNext;

                  if (lpCur == lpTail)
                    lpTail = lpPrev;

                  /* Adjust clip rectangle to cover both.  */
                  if (!UnionRect (&(lpmsg->rect), &(lpmsg->rect),
                                  &(lpCur->w32msg.rect)))
                    {
                      SetRectEmpty (&(lpmsg->rect));
                    }

                  myfree (lpCur);

                  nQueue--;

                  lpCur = lpNext;
                }
              else
                {
                  lpPrev = lpCur;
                  lpCur = lpNext;
                }
            }
        }

      bRet = TRUE;
    }

  if (nQueue == 0)
    ResetEvent (input_available);

  leave_crit ();

  return (bRet);
}

extern char * w32_strerror (int error_no);

/* Tell the main thread that we have input available; if the main
   thread is blocked in select(), we wake it up here.  */
static void
notify_msg_ready (void)
{
  SetEvent (input_available);

#ifdef CYGWIN
  /* Wakes up the main thread, which is blocked select()ing for /dev/windows,
     among other files.  */
  (void) PostThreadMessage (dwMainThreadId, WM_EMACS_INPUT_READY, 0, 0);
#endif /* CYGWIN */
}

BOOL
post_msg (W32Msg * lpmsg)
{
  int_msg * lpNew = (int_msg *) myalloc (sizeof (int_msg));

  if (!lpNew)
    return (FALSE);

  memcpy (&lpNew->w32msg, lpmsg, sizeof (W32Msg));
  lpNew->lpNext = NULL;

  enter_crit ();

  if (nQueue++)
    {
      lpTail->lpNext = lpNew;
    }
  else
    {
      lpHead = lpNew;
    }

  lpTail = lpNew;
  notify_msg_ready ();
  leave_crit ();

  return (TRUE);
}

BOOL
prepend_msg (W32Msg *lpmsg)
{
  int_msg * lpNew = (int_msg *) myalloc (sizeof (int_msg));

  if (!lpNew)
    return (FALSE);

  memcpy (&lpNew->w32msg, lpmsg, sizeof (W32Msg));

  enter_crit ();

  nQueue++;
  lpNew->lpNext = lpHead;
  lpHead = lpNew;
  notify_msg_ready ();
  leave_crit ();

  return (TRUE);
}

/* Process all messages in the current thread's queue.  Value is 1 if
   one of these messages was WM_EMACS_FILENOTIFY, zero otherwise.  */
int
drain_message_queue (void)
{
  MSG msg;
  int retval = 0;

  while (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
    {
      if (msg.message == WM_EMACS_FILENOTIFY)
	retval = 1;
      TranslateMessage (&msg);
      DispatchMessage (&msg);
    }
  return retval;
}

debug log:

solving 29636d1 ...
found 29636d1 in https://git.savannah.gnu.org/cgit/emacs.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).