src/w32term.h

   1 /* Definitions and headers for communication with Win32 GUI.
   2    Copyright (C) 1995 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 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 /* Added by Kevin Gallo */
  22
  23 #include <win32.h>
  24
  25 /* The class of this X application.  */
  26 #define EMACS_CLASS "Emacs"
  27 \f
  28 #define BLACK_PIX_DEFAULT(f) RGB(0,0,0)
  29 #define WHITE_PIX_DEFAULT(f) RGB(255,255,255)
  30
  31 #define FONT_WIDTH(f)   ((f)->tm.tmAveCharWidth)
  32 #define FONT_HEIGHT(f)  ((f)->tm.tmHeight)
  33 #define FONT_BASE(f)    ((f)->tm.tmAscent)
  34
  35 #define CHECK_WIN32_FRAME(f, frame)             \
  36   if (NILP (frame))                             \
  37     f = selected_frame;                         \
  38   else                                          \
  39     {                                           \
  40       CHECK_LIVE_FRAME (frame, 0);              \
  41       f = XFRAME (frame);                       \
  42     }                                           \
  43   if (! FRAME_WIN32_P (f))
  44
  45 /* Indicates whether we are in the readsocket call and the message we
  46    are processing in the current loop */
  47
  48 extern MSG CurMsg;
  49 extern BOOL bUseDflt;
  50
  51 extern struct frame *x_window_to_frame ();
  52
  53 enum text_cursor_kinds {
  54   filled_box_cursor, hollow_box_cursor, bar_cursor
  55 };
  56
  57 /* This data type is used for the font_table field
  58    of struct win32_display_info.  */
  59
  60 struct font_info
  61 {
  62   XFontStruct *font;
  63   char *name;
  64 };
  65
  66 /* Structure recording bitmaps and reference count.
  67    If REFCOUNT is 0 then this record is free to be reused.  */
  68
  69 struct win32_bitmap_record
  70 {
  71   Pixmap pixmap;
  72   char *file;
  73   HINSTANCE hinst; /* Used to load the file */
  74   int refcount;
  75   /* Record some info about this pixmap.  */
  76   int height, width, depth;
  77 };
  78 \f
  79 /* For each display (currently only one on win32), we have a structure that
  80    records information about it.  */
  81
  82 struct win32_display_info
  83 {
  84   /* Chain of all win32_display_info structures.  */
  85   struct win32_display_info *next;
  86   /* This is a cons cell of the form (NAME . FONT-LIST-CACHE).
  87      The same cons cell also appears in x_display_name_list.  */
  88   Lisp_Object name_list_element;
  89   /* Number of frames that are on this display.  */
  90   int reference_count;
  91   /* Number of planes on this screen.  */
  92   int n_planes;
  93   /* Number of bits per pixel on this screen.  */
  94   int n_cbits;
  95   /* Dimensions of this screen.  */
  96   int height, width;
  97   int height_in,width_in;
  98   /* Mask of things that cause the mouse to be grabbed.  */
  99   int grabbed;
 100   /* The root window of this screen.  */
 101   Window root_window;
 102   /* The cursor to use for vertical scroll bars.  */
 103   Cursor vertical_scroll_bar_cursor;
 104
 105   /* A table of all the fonts we have already loaded.  */
 106   struct font_info *font_table;
 107
 108   /* The current capacity of x_font_table.  */
 109   int font_table_size;
 110
 111   /* These variables describe the range of text currently shown
 112      in its mouse-face, together with the window they apply to.
 113      As long as the mouse stays within this range, we need not
 114      redraw anything on its account.  */
 115   int mouse_face_beg_row, mouse_face_beg_col;
 116   int mouse_face_end_row, mouse_face_end_col;
 117   int mouse_face_past_end;
 118   Lisp_Object mouse_face_window;
 119   int mouse_face_face_id;
 120
 121   /* 1 if a mouse motion event came and we didn't handle it right away because
 122      gc was in progress.  */
 123   int mouse_face_deferred_gc;
 124
 125   /* FRAME and X, Y position of mouse when last checked for
 126      highlighting.  X and Y can be negative or out of range for the frame.  */
 127   struct frame *mouse_face_mouse_frame;
 128   int mouse_face_mouse_x, mouse_face_mouse_y;
 129
 130   /* Nonzero means defer mouse-motion highlighting.  */
 131   int mouse_face_defer;
 132
 133   char *win32_id_name;
 134
 135   /* The number of fonts actually stored in win32_font_table.
 136      font_table[n] is used and valid iff 0 <= n < n_fonts.
 137      0 <= n_fonts <= font_table_size.  */
 138   int n_fonts;
 139
 140   /* Pointer to bitmap records.  */
 141   struct win32_bitmap_record *bitmaps;
 142
 143   /* Allocated size of bitmaps field.  */
 144   int bitmaps_size;
 145
 146   /* Last used bitmap index.  */
 147   int bitmaps_last;
 148
 149   /* The frame (if any) which has the window that has keyboard focus.
 150      Zero if none.  This is examined by Ffocus_frame in w32fns.c.  Note
 151      that a mere EnterNotify event can set this; if you need to know the
 152      last frame specified in a FocusIn or FocusOut event, use
 153      win32_focus_event_frame.  */
 154   struct frame *win32_focus_frame;
 155
 156   /* The last frame mentioned in a FocusIn or FocusOut event.  This is
 157      separate from win32_focus_frame, because whether or not LeaveNotify
 158      events cause us to lose focus depends on whether or not we have
 159      received a FocusIn event for it.  */
 160   struct frame *win32_focus_event_frame;
 161
 162   /* The frame which currently has the visual highlight, and should get
 163      keyboard input (other sorts of input have the frame encoded in the
 164      event).  It points to the focus frame's selected window's
 165      frame.  It differs from win32_focus_frame when we're using a global
 166      minibuffer.  */
 167   struct frame *win32_highlight_frame;
 168 };
 169
 170 /* This is a chain of structures for all the displays currently in use.  */
 171 extern struct win32_display_info one_win32_display_info;
 172
 173 /* This is a list of cons cells, each of the form (NAME . FONT-LIST-CACHE),
 174    one for each element of win32_display_list and in the same order.
 175    NAME is the name of the frame.
 176    FONT-LIST-CACHE records previous values returned by x-list-fonts.  */
 177 extern Lisp_Object win32_display_name_list;
 178
 179 extern struct win32_display_info *x_display_info_for_display ();
 180 extern struct win32_display_info *x_display_info_for_name ();
 181
 182 extern struct win32_display_info *win32_term_init ();
 183 \f
 184 /* Each Win32 frame object points to its own struct win32_display object
 185    in the output_data.win32 field.  The win32_display structure contains all
 186    the information that is specific to Win32 windows.  */
 187
 188 struct win32_output
 189 {
 190   /* Position of the Win32 window (x and y offsets in root window).  */
 191   int left_pos;
 192   int top_pos;
 193
 194   /* Border width of the Win32 window as known by the window system.  */
 195   int border_width;
 196
 197   /* Size of the Win32 window in pixels.  */
 198   int pixel_height, pixel_width;
 199
 200   /* Height of a line, in pixels.  */
 201   int line_height;
 202
 203   /* Width of the internal border.  This is a line of background color
 204      just inside the window's border.  When the frame is selected,
 205      a highlighting is displayed inside the internal border.  */
 206   int internal_border_width;
 207
 208   /* The window used for this frame.
 209      May be zero while the frame object is being created
 210      and the window has not yet been created.  */
 211   Window window_desc;
 212
 213   /* The window that is the parent of this window.
 214      Usually this is a window that was made by the window manager,
 215      but it can be the root window, and it can be explicitly specified
 216      (see the explicit_parent field, below).  */
 217   Window parent_desc;
 218
 219   XFontStruct *font;
 220
 221   /* Pixel values used for various purposes.
 222      border_pixel may be -1 meaning use a gray tile.  */
 223   unsigned long background_pixel;
 224   unsigned long foreground_pixel;
 225   unsigned long cursor_pixel;
 226   unsigned long border_pixel;
 227   unsigned long mouse_pixel;
 228   unsigned long cursor_foreground_pixel;
 229
 230   /* Descriptor for the cursor in use for this window.  */
 231   Cursor text_cursor;
 232   Cursor nontext_cursor;
 233   Cursor modeline_cursor;
 234   Cursor cross_cursor;
 235
 236   /* Flag to set when the window needs to be completely repainted.  */
 237   int needs_exposure;
 238
 239   /* What kind of text cursor is drawn in this window right now?
 240      (If there is no cursor (phys_cursor_x < 0), then this means nothing.)  */
 241   enum text_cursor_kinds current_cursor;
 242
 243   /* What kind of text cursor should we draw in the future?
 244      This should always be filled_box_cursor or bar_cursor.  */
 245   enum text_cursor_kinds desired_cursor;
 246
 247   /* Width of bar cursor (if we are using that).  */
 248   int cursor_width;
 249
 250   DWORD dwStyle;
 251
 252   /* The size of the extra width currently allotted for vertical
 253      scroll bars, in pixels.  */
 254   int vertical_scroll_bar_extra;
 255
 256   /* Table of parameter faces for this frame.  Any resources (pixel
 257      values, fonts) referred to here have been allocated explicitly
 258      for this face, and should be freed if we change the face.  */
 259   struct face **param_faces;
 260   int n_param_faces;
 261
 262   /* Table of computed faces for this frame.  These are the faces
 263      whose indexes go into the upper bits of a glyph, computed by
 264      combining the parameter faces specified by overlays, text
 265      properties, and what have you.  The resources mentioned here
 266      are all shared with parameter faces.  */
 267   struct face **computed_faces;
 268   int n_computed_faces;         /* How many are valid */
 269   int size_computed_faces;      /* How many are allocated */
 270
 271   /* This is the gravity value for the specified window position.  */
 272   int win_gravity;
 273
 274   /* The geometry flags for this window.  */
 275   int size_hint_flags;
 276
 277   /* This is the Emacs structure for the display this frame is on.  */
 278   /* struct win32_display_info *display_info; */
 279
 280   /* Nonzero means our parent is another application's window
 281      and was explicitly specified.  */
 282   char explicit_parent;
 283
 284   /* Nonzero means tried already to make this frame visible.  */
 285   char asked_for_visible;
 286 };
 287
 288 /* Get at the computed faces of an X window frame.  */
 289 #define FRAME_PARAM_FACES(f) ((f)->output_data.win32->param_faces)
 290 #define FRAME_N_PARAM_FACES(f) ((f)->output_data.win32->n_param_faces)
 291 #define FRAME_DEFAULT_PARAM_FACE(f) (FRAME_PARAM_FACES (f)[0])
 292 #define FRAME_MODE_LINE_PARAM_FACE(f) (FRAME_PARAM_FACES (f)[1])
 293
 294 #define FRAME_COMPUTED_FACES(f) ((f)->output_data.win32->computed_faces)
 295 #define FRAME_N_COMPUTED_FACES(f) ((f)->output_data.win32->n_computed_faces)
 296 #define FRAME_SIZE_COMPUTED_FACES(f) ((f)->output_data.win32->size_computed_faces)
 297 #define FRAME_DEFAULT_FACE(f) ((f)->output_data.win32->computed_faces[0])
 298 #define FRAME_MODE_LINE_FACE(f) ((f)->output_data.win32->computed_faces[1])
 299
 300 /* Return the window associated with the frame F.  */
 301 #define FRAME_WIN32_WINDOW(f) ((f)->output_data.win32->window_desc)
 302
 303 #define FRAME_FOREGROUND_PIXEL(f) ((f)->output_data.win32->foreground_pixel)
 304 #define FRAME_BACKGROUND_PIXEL(f) ((f)->output_data.win32->background_pixel)
 305 #define FRAME_FONT(f) ((f)->output_data.win32->font)
 306 #define FRAME_INTERNAL_BORDER_WIDTH(f) ((f)->output_data.win32->internal_border_width)
 307
 308 /* This gives the win32_display_info structure for the display F is on.  */
 309 #define FRAME_WIN32_DISPLAY_INFO(f) (&one_win32_display_info)
 310
 311 /* These two really ought to be called FRAME_PIXEL_{WIDTH,HEIGHT}.  */
 312 #define PIXEL_WIDTH(f) ((f)->output_data.win32->pixel_width)
 313 #define PIXEL_HEIGHT(f) ((f)->output_data.win32->pixel_height)
 314 #define FRAME_LINE_HEIGHT(f) ((f)->output_data.win32->line_height)
 315
 316 #define FRAME_DESIRED_CURSOR(f) ((f)->output_data.win32->desired_cursor)
 317
 318 \f
 319 /* Win32-specific scroll bar stuff.  */
 320
 321 /* We represent scroll bars as lisp vectors.  This allows us to place
 322    references to them in windows without worrying about whether we'll
 323    end up with windows referring to dead scroll bars; the garbage
 324    collector will free it when its time comes.
 325
 326    We use struct scroll_bar as a template for accessing fields of the
 327    vector.  */
 328
 329 struct scroll_bar {
 330
 331   /* These fields are shared by all vectors.  */
 332   EMACS_INT size_from_Lisp_Vector_struct;
 333   struct Lisp_Vector *next_from_Lisp_Vector_struct;
 334
 335   /* The window we're a scroll bar for.  */
 336   Lisp_Object window;
 337
 338   /* The next and previous in the chain of scroll bars in this frame.  */
 339   Lisp_Object next, prev;
 340
 341   /* The window representing this scroll bar.  Since this is a full
 342      32-bit quantity, we store it split into two 32-bit values.  */
 343   Lisp_Object win32_window_low, win32_window_high;
 344
 345   /* The position and size of the scroll bar in pixels, relative to the
 346      frame.  */
 347   Lisp_Object top, left, width, height;
 348
 349   /* The starting and ending positions of the handle, relative to the
 350      handle area (i.e. zero is the top position, not
 351      SCROLL_BAR_TOP_BORDER).  If they're equal, that means the handle
 352      hasn't been drawn yet.
 353
 354      These are not actually the locations where the beginning and end
 355      are drawn; in order to keep handles from becoming invisible when
 356      editing large files, we establish a minimum height by always
 357      drawing handle bottoms VERTICAL_SCROLL_BAR_MIN_HANDLE pixels below
 358      where they would be normally; the bottom and top are in a
 359      different co-ordinate system.  */
 360   Lisp_Object start, end;
 361
 362   /* If the scroll bar handle is currently being dragged by the user,
 363      this is the number of pixels from the top of the handle to the
 364      place where the user grabbed it.  If the handle isn't currently
 365      being dragged, this is Qnil.  */
 366   Lisp_Object dragging;
 367 };
 368
 369 /* The number of elements a vector holding a struct scroll_bar needs.  */
 370 #define SCROLL_BAR_VEC_SIZE                                     \
 371   ((sizeof (struct scroll_bar)                                  \
 372     - sizeof (EMACS_INT) - sizeof (struct Lisp_Vector *))       \
 373    / sizeof (Lisp_Object))
 374
 375 /* Turning a lisp vector value into a pointer to a struct scroll_bar.  */
 376 #define XSCROLL_BAR(vec) ((struct scroll_bar *) XVECTOR (vec))
 377
 378
 379 /* Building a 32-bit C integer from two 16-bit lisp integers.  */
 380 #define SCROLL_BAR_PACK(low, high) (XINT (high) << 16 | XINT (low))
 381
 382 /* Setting two lisp integers to the low and high words of a 32-bit C int.  */
 383 #define SCROLL_BAR_UNPACK(low, high, int32) \
 384   (XSETINT ((low),   (int32)        & 0xffff), \
 385    XSETINT ((high), ((int32) >> 16) & 0xffff))
 386
 387
 388 /* Extract the window id of the scroll bar from a struct scroll_bar.  */
 389 #define SCROLL_BAR_WIN32_WINDOW(ptr) \
 390   ((Window) SCROLL_BAR_PACK ((ptr)->win32_window_low, (ptr)->win32_window_high))
 391
 392 /* Store a window id in a struct scroll_bar.  */
 393 #define SET_SCROLL_BAR_WIN32_WINDOW(ptr, id) \
 394   (SCROLL_BAR_UNPACK ((ptr)->win32_window_low, (ptr)->win32_window_high, (int) id))
 395
 396
 397 /* Return the outside pixel height for a vertical scroll bar HEIGHT
 398    rows high on frame F.  */
 399 #define VERTICAL_SCROLL_BAR_PIXEL_HEIGHT(f, height) \
 400   ((height) * (f)->output_data.win32->line_height)
 401
 402 /* Return the inside width of a vertical scroll bar, given the outside
 403    width.  */
 404 #define VERTICAL_SCROLL_BAR_INSIDE_WIDTH(width) \
 405   ((width) - VERTICAL_SCROLL_BAR_LEFT_BORDER - VERTICAL_SCROLL_BAR_RIGHT_BORDER)
 406
 407 /* Return the length of the rectangle within which the top of the
 408    handle must stay.  This isn't equivalent to the inside height,
 409    because the scroll bar handle has a minimum height.
 410
 411    This is the real range of motion for the scroll bar, so when we're
 412    scaling buffer positions to scroll bar positions, we use this, not
 413    VERTICAL_SCROLL_BAR_INSIDE_HEIGHT.  */
 414 #define VERTICAL_SCROLL_BAR_TOP_RANGE(height) \
 415   (VERTICAL_SCROLL_BAR_INSIDE_HEIGHT (height) - VERTICAL_SCROLL_BAR_MIN_HANDLE)
 416
 417 /* Return the inside height of vertical scroll bar, given the outside
 418    height.  See VERTICAL_SCROLL_BAR_TOP_RANGE too.  */
 419 #define VERTICAL_SCROLL_BAR_INSIDE_HEIGHT(height) \
 420   ((height) - VERTICAL_SCROLL_BAR_TOP_BORDER - VERTICAL_SCROLL_BAR_BOTTOM_BORDER)
 421
 422
 423 /* Border widths for scroll bars.
 424
 425    Scroll bar windows don't have any borders; their border width is
 426    set to zero, and we redraw borders ourselves.  This makes the code
 427    a bit cleaner, since we don't have to convert between outside width
 428    (used when relating to the rest of the screen) and inside width
 429    (used when sizing and drawing the scroll bar window itself).
 430
 431    The handle moves up and down/back and forth in a rectangle inset
 432    from the edges of the scroll bar.  These are widths by which we
 433    inset the handle boundaries from the scroll bar edges.  */
 434 #define VERTICAL_SCROLL_BAR_LEFT_BORDER (0)
 435 #define VERTICAL_SCROLL_BAR_RIGHT_BORDER (0)
 436 #define VERTICAL_SCROLL_BAR_TOP_BORDER (0)
 437 #define VERTICAL_SCROLL_BAR_BOTTOM_BORDER (0)
 438
 439 /* Minimum lengths for scroll bar handles, in pixels.  */
 440 #define VERTICAL_SCROLL_BAR_MIN_HANDLE (0)
 441
 442 \f
 443 /* Manipulating pixel sizes and character sizes.
 444    Knowledge of which factors affect the overall size of the window should
 445    be hidden in these macros, if that's possible.
 446
 447    Return the upper/left pixel position of the character cell on frame F
 448    at ROW/COL.  */
 449 #define CHAR_TO_PIXEL_ROW(f, row) \
 450   ((f)->output_data.win32->internal_border_width \
 451    + (row) * (f)->output_data.win32->line_height)
 452 #define CHAR_TO_PIXEL_COL(f, col) \
 453   ((f)->output_data.win32->internal_border_width \
 454    + (col) * FONT_WIDTH ((f)->output_data.win32->font))
 455
 456 /* Return the pixel width/height of frame F if it has
 457    WIDTH columns/HEIGHT rows.  */
 458 #define CHAR_TO_PIXEL_WIDTH(f, width) \
 459   (CHAR_TO_PIXEL_COL (f, width) \
 460    + (f)->output_data.win32->vertical_scroll_bar_extra \
 461    + (f)->output_data.win32->internal_border_width)
 462 #define CHAR_TO_PIXEL_HEIGHT(f, height) \
 463   (CHAR_TO_PIXEL_ROW (f, height) \
 464    + (f)->output_data.win32->internal_border_width)
 465
 466
 467 /* Return the row/column (zero-based) of the character cell containing
 468    the pixel on FRAME at ROW/COL.  */
 469 #define PIXEL_TO_CHAR_ROW(f, row) \
 470   (((row) - (f)->output_data.win32->internal_border_width) \
 471    / (f)->output_data.win32->line_height)
 472 #define PIXEL_TO_CHAR_COL(f, col) \
 473   (((col) - (f)->output_data.win32->internal_border_width) \
 474    / FONT_WIDTH ((f)->output_data.win32->font))
 475
 476 /* How many columns/rows of text can we fit in WIDTH/HEIGHT pixels on
 477    frame F?  */
 478 #define PIXEL_TO_CHAR_WIDTH(f, width) \
 479   (PIXEL_TO_CHAR_COL (f, ((width) \
 480                           - (f)->output_data.win32->internal_border_width \
 481                           - (f)->output_data.win32->vertical_scroll_bar_extra)))
 482 #define PIXEL_TO_CHAR_HEIGHT(f, height) \
 483   (PIXEL_TO_CHAR_ROW (f, ((height) \
 484                           - (f)->output_data.win32->internal_border_width)))
 485 \f
 486 /* Interface to the face code functions.  */
 487
 488 /* Create the first two computed faces for a frame -- the ones that
 489    have GC's.  */
 490 extern void init_frame_faces (/* FRAME_PTR */);
 491
 492 /* Free the resources for the faces associated with a frame.  */
 493 extern void free_frame_faces (/* FRAME_PTR */);
 494
 495 /* Given a computed face, find or make an equivalent display face
 496    in face_vector, and return a pointer to it.  */
 497 extern struct face *intern_face (/* FRAME_PTR, struct face * */);
 498
 499 /* Given a frame and a face name, return the face's ID number, or
 500    zero if it isn't a recognized face name.  */
 501 extern int face_name_id_number (/* FRAME_PTR, Lisp_Object */);
 502
 503 /* Return non-zero if FONT1 and FONT2 have the same size bounding box.
 504    We assume that they're both character-cell fonts.  */
 505 extern int same_size_fonts (/* XFontStruct *, XFontStruct * */);
 506
 507 /* Recompute the GC's for the default and modeline faces.
 508    We call this after changing frame parameters on which those GC's
 509    depend.  */
 510 extern void recompute_basic_faces (/* FRAME_PTR */);
 511
 512 /* Return the face ID associated with a buffer position POS.  Store
 513    into *ENDPTR the next position at which a different face is
 514    needed.  This does not take account of glyphs that specify their
 515    own face codes.  F is the frame in use for display, and W is a
 516    window displaying the current buffer.
 517
 518    REGION_BEG, REGION_END delimit the region, so it can be highlighted.  */
 519 extern int compute_char_face (/* FRAME_PTR frame,
 520                                  struct window *w,
 521                                  int pos,
 522                                  int region_beg, int region_end,
 523                                  int *endptr */);
 524 /* Return the face ID to use to display a special glyph which selects
 525    FACE_CODE as the face ID, assuming that ordinarily the face would
 526    be BASIC_FACE.  F is the frame.  */
 527 extern int compute_glyph_face (/* FRAME_PTR, int */);
 528
 529 extern void win32_fill_rect ();
 530 extern void win32_clear_window ();
 531
 532 #define win32_fill_area(f,hdc,pix,x,y,nx,ny) \
 533 { \
 534     RECT rect; \
 535     rect.left = x; \
 536     rect.top = y; \
 537     rect.right = x + nx; \
 538     rect.bottom = y + ny; \
 539     win32_fill_rect (f,hdc,pix,&rect); \
 540 }
 541
 542 #define win32_clear_rect(f,hdc,lprect) \
 543 win32_fill_rect (f,hdc,f->output_data.win32->background_pixel,lprect)
 544
 545 #define win32_clear_area(f,hdc,x,y,nx,ny) \
 546 win32_fill_area (f,hdc,f->output_data.win32->background_pixel,x,y,nx,ny)
 547
 548 extern XFontStruct *win32_load_font ();
 549 extern void win32_unload_font ();
 550
 551 extern HDC map_mode();
 552
 553 #define my_get_dc(hwnd) (map_mode (GetDC (hwnd)))
 554
 555 #define WM_EMACS_START                 (WM_USER + 1)
 556 #define WM_EMACS_KILL                  (WM_EMACS_START + 0x00)
 557 #define WM_EMACS_CREATEWINDOW          (WM_EMACS_START + 0x01)
 558 #define WM_EMACS_DONE                  (WM_EMACS_START + 0x02)
 559 #define WM_EMACS_CREATESCROLLBAR       (WM_EMACS_START + 0x03)
 560 #define WM_EMACS_DESTROYWINDOW         (WM_EMACS_START + 0x04)
 561 #define WM_EMACS_END                   (WM_EMACS_START + 0x10)
 562
 563 #define WND_X_UNITS_INDEX      (0)
 564 #define WND_Y_UNITS_INDEX      (4)
 565 #define WND_BACKGROUND_INDEX   (8)
 566
 567 #define WND_LAST_INDEX      (16)
 568 #define WND_EXTRA_BYTES     (WND_LAST_INDEX)
 569
 570 extern DWORD dwWinThreadId;
 571 extern HANDLE hWinThread;
 572 extern DWORD dwMainThreadId;
 573 extern HANDLE hMainThread;
 574
 575 typedef struct Win32Msg {
 576     MSG msg;
 577     DWORD dwModifiers;
 578     RECT rect;
 579 } Win32Msg;
 580
 581 extern void init_crit ();
 582 extern void enter_crit ();
 583 extern void leave_crit ();
 584 extern void delete_crit ();
 585
 586 extern BOOL get_next_msg ();
 587 extern BOOL post_msg ();
 588 extern void wait_for_sync ();
 589
 590 extern BOOL parse_button ();