/* Definitions and headers for communication on the Microsoft W32 API.
   Copyright (C) 1995, 2001 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 2, 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; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Added by Kevin Gallo */

#include "w32gui.h"

/* The class of this X application.  */
#define EMACS_CLASS "Emacs"

#define BLACK_PIX_DEFAULT(f) PALETTERGB(0,0,0)
#define WHITE_PIX_DEFAULT(f) PALETTERGB(255,255,255)

#define FONT_WIDTH(f)       \
  ((f)->bdf ? (f)->bdf->width : (f)->tm.tmAveCharWidth)
#define FONT_HEIGHT(f)      \
   ((f)->bdf ? (f)->bdf->height : (f)->tm.tmHeight)
#define FONT_BASE(f)        \
  ((f)->bdf ? (f)->bdf->ury : (f)->tm.tmAscent)
#define FONT_DESCENT(f)     \
  ((f)->bdf ? -((f)->bdf->lly) : (f)->tm.tmDescent)
#define FONT_MAX_WIDTH(f)   \
  ((f)->bdf ? (f)->bdf->width : (f)->tm.tmMaxCharWidth)

#define CP_DEFAULT 1004
/* Special pseudo-codepages. */
#define CP_8BIT      -1
#define CP_UNICODE   -2
#define CP_UNKNOWN   -3

#define CHECK_W32_FRAME(f, frame)		\
  if (NILP (frame))				\
    f = SELECTED_FRAME ();			\
  else						\
    {						\
      CHECK_LIVE_FRAME (frame, 0);		\
      f = XFRAME (frame);			\
    }						\
  if (! FRAME_W32_P (f))

/* Indicates whether we are in the readsocket call and the message we
   are processing in the current loop */

extern MSG CurMsg;
extern BOOL bUseDflt;

extern struct frame *x_window_to_frame ();

enum text_cursor_kinds {
  NO_CURSOR = -1,
  FILLED_BOX_CURSOR,
  HOLLOW_BOX_CURSOR,
  BAR_CURSOR
};

/* Structure recording bitmaps and reference count.
   If REFCOUNT is 0 then this record is free to be reused.  */

struct w32_bitmap_record 
{
  Pixmap pixmap;
  char *file;
  HINSTANCE hinst; /* Used to load the file */
  int refcount;
  /* Record some info about this pixmap.  */
  int height, width, depth;
};

/* Palette book-keeping stuff for mapping requested colors into the
   system palette.  Keep a ref-counted list of requested colors and
   regenerate the app palette whenever the requested list changes. */

extern Lisp_Object Vw32_enable_palette;

struct w32_palette_entry {
  struct w32_palette_entry * next;
  PALETTEENTRY entry;
#if 0
  unsigned refcount;
#endif
};

extern void w32_regenerate_palette(struct frame *f);


/* For each display (currently only one on w32), we have a structure that
   records information about it.  */

struct w32_display_info
{
  /* Chain of all w32_display_info structures.  */
  struct w32_display_info *next;

  /* This is a cons cell of the form (NAME . FONT-LIST-CACHE).
     The same cons cell also appears in x_display_name_list.  */
  Lisp_Object name_list_element;

  /* Number of frames that are on this display.  */
  int reference_count;

  /* Dots per inch of the screen.  */
  double resx, resy;

  /* Number of planes on this screen.  */
  int n_planes;

  /* Number of bits per pixel on this screen.  */
  int n_cbits;

  /* Dimensions of this screen.  */
  int height, width;
  int height_in,width_in;

  /* Mask of things that cause the mouse to be grabbed.  */
  int grabbed;

  /* Emacs bitmap-id of the default icon bitmap for this frame.
     Or -1 if none has been allocated yet.  */
  int icon_bitmap_id;

  /* The root window of this screen.  */
  Window root_window;

  /* The cursor to use for vertical scroll bars.  */
  Cursor vertical_scroll_bar_cursor;

  /* color palette information.  */
  int has_palette;
  struct w32_palette_entry * color_list;
  unsigned num_colors;
  HPALETTE palette;

  /* deferred action flags checked when starting frame update.  */
  int regen_palette;

  /* Keystroke that has been faked by Emacs and will be ignored when
     received; value is reset after key is received.  */
  int faked_key;

  /* A table of all the fonts we have already loaded.  */
  struct font_info *font_table;

  /* The current capacity of font_table.  */
  int font_table_size;

  /* Minimum width over all characters in all fonts in font_table.  */
  int smallest_char_width;

  /* Minimum font height over all fonts in font_table.  */
  int smallest_font_height;

  /* Reusable Graphics Context for drawing a cursor in a non-default face. */
  XGCValues *scratch_cursor_gc;

  /* These variables describe the range of text currently shown in its
     mouse-face, together with the window they apply to. As long as
     the mouse stays within this range, we need not redraw anything on
     its account.  Rows and columns are glyph matrix positions in
     MOUSE_FACE_WINDOW.  */
  int mouse_face_beg_row, mouse_face_beg_col;
  int mouse_face_beg_x, mouse_face_beg_y;
  int mouse_face_end_row, mouse_face_end_col;
  int mouse_face_end_x, mouse_face_end_y;
  int mouse_face_past_end;
  Lisp_Object mouse_face_window;
  int mouse_face_face_id;
  Lisp_Object mouse_face_overlay;

  /* 1 if a mouse motion event came and we didn't handle it right away because
     gc was in progress.  */
  int mouse_face_deferred_gc;

  /* FRAME and X, Y position of mouse when last checked for
     highlighting.  X and Y can be negative or out of range for the frame.  */
  struct frame *mouse_face_mouse_frame;
  int mouse_face_mouse_x, mouse_face_mouse_y;

  /* Nonzero means defer mouse-motion highlighting.  */
  int mouse_face_defer;

  int mouse_face_image_state;

  char *w32_id_name;

  /* The number of fonts actually stored in w32_font_table.
     font_table[n] is used and valid iff 0 <= n < n_fonts. 0 <=
     n_fonts <= font_table_size. and font_table[i].name != 0. */
  int n_fonts;

  /* Pointer to bitmap records.  */
  struct w32_bitmap_record *bitmaps;

  /* Allocated size of bitmaps field.  */
  int bitmaps_size;

  /* Last used bitmap index.  */
  int bitmaps_last;

  /* The frame (if any) which has the window that has keyboard focus.
     Zero if none.  This is examined by Ffocus_frame in w32fns.c.  Note
     that a mere EnterNotify event can set this; if you need to know the
     last frame specified in a FocusIn or FocusOut event, use
     w32_focus_event_frame.  */
  struct frame *w32_focus_frame;

  /* The last frame mentioned in a FocusIn or FocusOut event.  This is
     separate from w32_focus_frame, because whether or not LeaveNotify
     events cause us to lose focus depends on whether or not we have
     received a FocusIn event for it.  */
  struct frame *w32_focus_event_frame;

  /* The frame which currently has the visual highlight, and should get
     keyboard input (other sorts of input have the frame encoded in the
     event).  It points to the focus frame's selected window's
     frame.  It differs from w32_focus_frame when we're using a global
     minibuffer.  */
  struct frame *w32_highlight_frame;

  /* Cache of images.  */
  struct image_cache *image_cache;
};

/* This is a chain of structures for all the displays currently in use.  */
extern struct w32_display_info *x_display_list;
extern struct w32_display_info one_w32_display_info;

/* This is a list of cons cells, each of the form (NAME . FONT-LIST-CACHE),
   one for each element of w32_display_list and in the same order.
   NAME is the name of the frame.
   FONT-LIST-CACHE records previous values returned by x-list-fonts.  */
extern Lisp_Object w32_display_name_list;

/* Regexp matching a font name whose width is the same as `PIXEL_SIZE'.  */
extern Lisp_Object Vx_pixel_size_width_font_regexp;

/* A flag to control how to display unibyte 8-bit character.  */
extern int unibyte_display_via_language_environment;

struct w32_display_info *x_display_info_for_name ();

extern struct w32_display_info *w32_term_init ();

extern Lisp_Object w32_list_fonts P_ ((struct frame *, Lisp_Object, int, int));
extern struct font_info *w32_get_font_info (), *w32_query_font ();
extern void w32_cache_char_metrics (XFontStruct *font);
extern void w32_find_ccl_program();

#define PIX_TYPE COLORREF

/* Each W32 frame object points to its own struct w32_display object
   in the output_data.w32 field.  The w32_display structure contains all
   the information that is specific to W32 windows.  */

/* Put some things in x_output for compatibility.
   NTEMACS_TODO: Move all common things here to eliminate unneccesary
   diffs between X and w32 code.  */
struct x_output
{
  PIX_TYPE background_pixel;
  PIX_TYPE foreground_pixel;
};


struct w32_output
{
  /* Placeholder for things accessed through output_data.x.  */
  struct x_output x_compatible;

  /* Menubar "widget" handle.  */
  HMENU menubar_widget;

  /* Original palette (used to deselect real palette after drawing) */
  HPALETTE old_palette;

  /* Position of the W32 window (x and y offsets in root window).  */
  int left_pos;
  int top_pos;

  /* Border width of the W32 window as known by the window system.  */
  int border_width;

  /* Size of the W32 window in pixels.  */
  int pixel_height, pixel_width;

  /* Height of a line, in pixels.  */
  int line_height;

  /* Here are the Graphics Contexts for the default font.  */
  XGCValues *cursor_gc;				/* cursor drawing */

  /* Width of the internal border.  This is a line of background color
     just inside the window's border.  When the frame is selected,
     a highlighting is displayed inside the internal border.  */
  int internal_border_width;

  /* The window used for this frame.
     May be zero while the frame object is being created
     and the window has not yet been created.  */
  Window window_desc;

  /* The window that is the parent of this window.
     Usually this is a window that was made by the window manager,
     but it can be the root window, and it can be explicitly specified
     (see the explicit_parent field, below).  */
  Window parent_desc;

  /* Default ASCII font of this frame. */
  XFontStruct *font;

  /* The baseline offset of the default ASCII font.  */
  int baseline_offset;

  /* If a fontset is specified for this frame instead of font, this
     value contains an ID of the fontset, else -1.  */
  int fontset;

  /* Pixel values used for various purposes.
     border_pixel may be -1 meaning use a gray tile.  */
  COLORREF cursor_pixel;
  COLORREF border_pixel;
  COLORREF mouse_pixel;
  COLORREF cursor_foreground_pixel;

  /* Foreground color for scroll bars.  A value of -1 means use the
     default (black for non-toolkit scroll bars).  */
  COLORREF scroll_bar_foreground_pixel;
  
  /* Background color for scroll bars.  A value of -1 means use the
     default (background color of the frame for non-toolkit scroll
     bars).  */
  COLORREF scroll_bar_background_pixel;

  /* Descriptor for the cursor in use for this window.  */
  Cursor text_cursor;
  Cursor nontext_cursor;
  Cursor modeline_cursor;
  Cursor cross_cursor;
  Cursor hourglass_cursor;
  Cursor horizontal_drag_cursor;

  /* Window whose cursor is hourglass_cursor.  This window is
     temporarily mapped to display an hourglass cursor.  */
  Window hourglass_window;
  
  /* Non-zero means hourglass cursor is currently displayed.  */
  unsigned hourglass_p : 1;

  /* Flag to set when the window needs to be completely repainted.  */
  int needs_exposure;

  /* What kind of text cursor is drawn in this window right now?
     (If there is no cursor (phys_cursor_x < 0), then this means nothing.)  */
  enum text_cursor_kinds current_cursor;

  /* What kind of text cursor should we draw in the future?
     This should always be filled_box_cursor or bar_cursor.  */
  enum text_cursor_kinds desired_cursor;

  /* Width of bar cursor (if we are using that).  */
  int cursor_width;

  DWORD dwStyle;

  /* The size of the extra width currently allotted for vertical
     scroll bars, in pixels.  */
  int vertical_scroll_bar_extra;

  /* The extra width currently allotted for the areas in which
     truncation marks, continuation marks, and overlay arrows are
     displayed.  */
  int flags_areas_extra;

  /* This is the gravity value for the specified window position.  */
  int win_gravity;

  /* The geometry flags for this window.  */
  int size_hint_flags;

  /* This is the Emacs structure for the display this frame is on.  */
  /* struct w32_display_info *display_info; */

  /* Nonzero means our parent is another application's window
     and was explicitly specified.  */
  char explicit_parent;

  /* Nonzero means tried already to make this frame visible.  */
  char asked_for_visible;

  /* Nonzero means menubar is currently active.  */
  char menubar_active;

  /* Nonzero means menubar is about to become active, but should be
     brought up to date first.  */
  volatile char pending_menu_activation;

  /* Relief GCs, colors etc.  */
  struct relief
  {
    XGCValues *gc;
    unsigned long pixel;
    int allocated_p;
  }
  black_relief, white_relief;

  /* The background for which the above relief GCs were set up.
     They are changed only when a different background is involved.  */
  unsigned long relief_background;
};

extern struct w32_output w32term_display;

/* Return the window associated with the frame F.  */
#define FRAME_W32_WINDOW(f) ((f)->output_data.w32->window_desc)

#define FRAME_FOREGROUND_PIXEL(f) ((f)->output_data.x->foreground_pixel)
#define FRAME_BACKGROUND_PIXEL(f) ((f)->output_data.x->background_pixel)
#define FRAME_FONT(f) ((f)->output_data.w32->font)
#define FRAME_FONTSET(f) ((f)->output_data.w32->fontset)
#define FRAME_INTERNAL_BORDER_WIDTH(f) ((f)->output_data.w32->internal_border_width)
#define FRAME_LINE_HEIGHT(f) ((f)->output_data.w32->line_height)
/* Width of the default font of frame F.  Must be defined by each
   terminal specific header.  */
#define FRAME_DEFAULT_FONT_WIDTH(F) 	FONT_WIDTH (FRAME_FONT (F))
#define FRAME_BASELINE_OFFSET(f) ((f)->output_data.w32->baseline_offset)

/* This gives the w32_display_info structure for the display F is on.  */
#define FRAME_W32_DISPLAY_INFO(f) (&one_w32_display_info)
#define FRAME_X_DISPLAY_INFO(f) (&one_w32_display_info)

/* This is the 'font_info *' which frame F has.  */
#define FRAME_W32_FONT_TABLE(f) (FRAME_W32_DISPLAY_INFO (f)->font_table)

/* These two really ought to be called FRAME_PIXEL_{WIDTH,HEIGHT}.  */
#define PIXEL_WIDTH(f) ((f)->output_data.w32->pixel_width)
#define PIXEL_HEIGHT(f) ((f)->output_data.w32->pixel_height)

#define FRAME_DESIRED_CURSOR(f) ((f)->output_data.w32->desired_cursor)

/* Value is the smallest width of any character in any font on frame F.  */

#define FRAME_SMALLEST_CHAR_WIDTH(F) \
     FRAME_W32_DISPLAY_INFO(F)->smallest_char_width

/* Value is the smallest height of any font on frame F.  */

#define FRAME_SMALLEST_FONT_HEIGHT(F) \
     FRAME_W32_DISPLAY_INFO(F)->smallest_font_height

/* Return a pointer to the image cache of frame F.  */

#define FRAME_X_IMAGE_CACHE(F) FRAME_W32_DISPLAY_INFO ((F))->image_cache


/* Pixel width of the bitmaps drawn to indicate truncation,
   continuation etc.  */

#define FRAME_FLAGS_BITMAP_WIDTH(f)	8
#define FRAME_FLAGS_BITMAP_HEIGHT(f)	8

/* Total width of areas reserved for drawing truncation bitmaps,
   continuation bitmaps and alike.  The width is in canonical char
   units of the frame.  This must currently be the case because window
   sizes aren't pixel values.  If it weren't the case, we wouldn't be
   able to split windows horizontally nicely.  */

#define FRAME_X_FLAGS_AREA_COLS(F)				\
     ((2 * FRAME_FLAGS_BITMAP_WIDTH ((F)) + CANON_X_UNIT ((F)) - 1)	\
      / CANON_X_UNIT ((F)))

/* Total width of flags areas in pixels.  */

#define FRAME_X_FLAGS_AREA_WIDTH(F) \
     (FRAME_X_FLAGS_AREA_COLS ((F)) * CANON_X_UNIT ((F)))

/* Pixel-width of the left flags area.  */

#define FRAME_X_LEFT_FLAGS_AREA_WIDTH(F) \
     (FRAME_X_FLAGS_AREA_WIDTH (F) / 2)

/* Pixel-width of the right flags area.  Note that we are doing
   integer arithmetic here, so don't loose a pixel if the total
   width is an odd number.  */

#define FRAME_X_RIGHT_FLAGS_AREA_WIDTH(F) 	\
     (FRAME_X_FLAGS_AREA_WIDTH (F) - FRAME_X_FLAGS_AREA_WIDTH (F) / 2)



/* W32-specific scroll bar stuff.  */

/* We represent scroll bars as lisp vectors.  This allows us to place
   references to them in windows without worrying about whether we'll
   end up with windows referring to dead scroll bars; the garbage
   collector will free it when its time comes.

   We use struct scroll_bar as a template for accessing fields of the
   vector.  */

struct scroll_bar {

  /* These fields are shared by all vectors.  */
  EMACS_INT size_from_Lisp_Vector_struct;
  struct Lisp_Vector *next_from_Lisp_Vector_struct;

  /* The window we're a scroll bar for.  */
  Lisp_Object window;

  /* The next and previous in the chain of scroll bars in this frame.  */
  Lisp_Object next, prev;

  /* The window representing this scroll bar.  Since this is a full
     32-bit quantity, we store it split into two 32-bit values.  */
  Lisp_Object w32_window_low, w32_window_high;

  /* Same as above for the widget.  */
  Lisp_Object w32_widget_low, w32_widget_high;

  /* The position and size of the scroll bar in pixels, relative to the
     frame.  */
  Lisp_Object top, left, width, height;

  /* The starting and ending positions of the handle, relative to the
     handle area (i.e. zero is the top position, not
     SCROLL_BAR_TOP_BORDER).  If they're equal, that means the handle
     hasn't been drawn yet.

     These are not actually the locations where the beginning and end
     are drawn; in order to keep handles from becoming invisible when
     editing large files, we establish a minimum height by always
     drawing handle bottoms VERTICAL_SCROLL_BAR_MIN_HANDLE pixels below
     where they would be normally; the bottom and top are in a
     different co-ordinate system.  */
  Lisp_Object start, end;

  /* If the scroll bar handle is currently being dragged by the user,
     this is the number of pixels from the top of the handle to the
     place where the user grabbed it.  If the handle isn't currently
     being dragged, this is Qnil.  */
  Lisp_Object dragging;
};

/* The number of elements a vector holding a struct scroll_bar needs.  */
#define SCROLL_BAR_VEC_SIZE					\
  ((sizeof (struct scroll_bar)					\
    - sizeof (EMACS_INT) - sizeof (struct Lisp_Vector *))	\
   / sizeof (Lisp_Object))

/* Turning a lisp vector value into a pointer to a struct scroll_bar.  */
#define XSCROLL_BAR(vec) ((struct scroll_bar *) XVECTOR (vec))


/* Building a 32-bit C integer from two 16-bit lisp integers.  */
#define SCROLL_BAR_PACK(low, high) (XINT (high) << 16 | XINT (low))

/* Setting two lisp integers to the low and high words of a 32-bit C int.  */
#define SCROLL_BAR_UNPACK(low, high, int32) \
  (XSETINT ((low),   (int32)        & 0xffff), \
   XSETINT ((high), ((int32) >> 16) & 0xffff))


/* Extract the window id of the scroll bar from a struct scroll_bar.  */
#define SCROLL_BAR_W32_WINDOW(ptr) \
  ((Window) SCROLL_BAR_PACK ((ptr)->w32_window_low, (ptr)->w32_window_high))

/* Store a window id in a struct scroll_bar.  */
#define SET_SCROLL_BAR_W32_WINDOW(ptr, id) \
  (SCROLL_BAR_UNPACK ((ptr)->w32_window_low, (ptr)->w32_window_high, (int) id))

/* Extract the X widget of the scroll bar from a struct scroll_bar.  */
#define SCROLL_BAR_X_WIDGET(ptr) \
  ((Widget) SCROLL_BAR_PACK ((ptr)->x_widget_low, (ptr)->x_widget_high))

/* Store a widget id in a struct scroll_bar.  */
#define SET_SCROLL_BAR_X_WIDGET(ptr, w) \
  (SCROLL_BAR_UNPACK ((ptr)->x_widget_low, (ptr)->x_widget_high, (int) w))

/* Return the inside width of a vertical scroll bar, given the outside
   width.  */
#define VERTICAL_SCROLL_BAR_INSIDE_WIDTH(f,width) \
  ((width) \
   - VERTICAL_SCROLL_BAR_LEFT_BORDER \
   - VERTICAL_SCROLL_BAR_RIGHT_BORDER \
   - VERTICAL_SCROLL_BAR_WIDTH_TRIM * 2)

/* Return the length of the rectangle within which the top of the
   handle must stay.  This isn't equivalent to the inside height,
   because the scroll bar handle has a minimum height.  

   This is the real range of motion for the scroll bar, so when we're
   scaling buffer positions to scroll bar positions, we use this, not
   VERTICAL_SCROLL_BAR_INSIDE_HEIGHT.  */
#define VERTICAL_SCROLL_BAR_TOP_RANGE(f,height) \
  (VERTICAL_SCROLL_BAR_INSIDE_HEIGHT (f, height) - VERTICAL_SCROLL_BAR_MIN_HANDLE)

/* Return the inside height of vertical scroll bar, given the outside
   height.  See VERTICAL_SCROLL_BAR_TOP_RANGE too.  */
#define VERTICAL_SCROLL_BAR_INSIDE_HEIGHT(f,height) \
  ((height) - VERTICAL_SCROLL_BAR_TOP_BORDER - VERTICAL_SCROLL_BAR_BOTTOM_BORDER)


/* Border widths for scroll bars.

   Scroll bar windows don't have any borders; their border width is
   set to zero, and we redraw borders ourselves.  This makes the code
   a bit cleaner, since we don't have to convert between outside width
   (used when relating to the rest of the screen) and inside width
   (used when sizing and drawing the scroll bar window itself).

   The handle moves up and down/back and forth in a rectangle inset
   from the edges of the scroll bar.  These are widths by which we
   inset the handle boundaries from the scroll bar edges.  */
#define VERTICAL_SCROLL_BAR_LEFT_BORDER (0)
#define VERTICAL_SCROLL_BAR_RIGHT_BORDER (0)
#define VERTICAL_SCROLL_BAR_TOP_BORDER (vertical_scroll_bar_top_border)
#define VERTICAL_SCROLL_BAR_BOTTOM_BORDER (vertical_scroll_bar_bottom_border)

/* Minimum lengths for scroll bar handles, in pixels.  */
#define VERTICAL_SCROLL_BAR_MIN_HANDLE (vertical_scroll_bar_min_handle)

/* Trimming off a few pixels from each side prevents
   text from glomming up against the scroll bar */
#define VERTICAL_SCROLL_BAR_WIDTH_TRIM (0)


/* Manipulating pixel sizes and character sizes.
   Knowledge of which factors affect the overall size of the window should
   be hidden in these macros, if that's possible.

   Return the upper/left pixel position of the character cell on frame F
   at ROW/COL.  */
#define CHAR_TO_PIXEL_ROW(f, row) \
  ((f)->output_data.w32->internal_border_width \
   + (row) * (f)->output_data.w32->line_height)
#define CHAR_TO_PIXEL_COL(f, col) \
  ((f)->output_data.w32->internal_border_width \
   + (col) * FONT_WIDTH ((f)->output_data.w32->font))

/* Return the pixel width/height of frame F if it has
   WIDTH columns/HEIGHT rows.  */
#define CHAR_TO_PIXEL_WIDTH(f, width) \
  (CHAR_TO_PIXEL_COL (f, width) \
   + (f)->output_data.w32->vertical_scroll_bar_extra \
   + (f)->output_data.w32->flags_areas_extra \
   + (f)->output_data.w32->internal_border_width)
#define CHAR_TO_PIXEL_HEIGHT(f, height) \
  (CHAR_TO_PIXEL_ROW (f, height) \
   + (f)->output_data.w32->internal_border_width)


/* Return the row/column (zero-based) of the character cell containing 
   the pixel on FRAME at ROW/COL.  */
#define PIXEL_TO_CHAR_ROW(f, row) \
  (((row) - (f)->output_data.w32->internal_border_width) \
   / (f)->output_data.w32->line_height)
#define PIXEL_TO_CHAR_COL(f, col) \
  (((col) - (f)->output_data.w32->internal_border_width) \
   / FONT_WIDTH ((f)->output_data.w32->font))

/* How many columns/rows of text can we fit in WIDTH/HEIGHT pixels on
   frame F?  */
#define PIXEL_TO_CHAR_WIDTH(f, width) \
  (PIXEL_TO_CHAR_COL (f, ((width) \
			  - (f)->output_data.w32->internal_border_width \
			  - (f)->output_data.w32->flags_areas_extra \
			  - (f)->output_data.w32->vertical_scroll_bar_extra)))
#define PIXEL_TO_CHAR_HEIGHT(f, height) \
  (PIXEL_TO_CHAR_ROW (f, ((height) \
			  - (f)->output_data.w32->internal_border_width)))


extern void w32_fill_rect ();
extern void w32_clear_window ();

#define w32_fill_area(f,hdc,pix,x,y,nx,ny) \
{ \
    RECT rect; \
    rect.left = x; \
    rect.top = y; \
    rect.right = x + nx; \
    rect.bottom = y + ny; \
    w32_fill_rect (f,hdc,pix,&rect); \
}

#define w32_clear_rect(f,hdc,lprect) \
w32_fill_rect (f,hdc,f->output_data.x->background_pixel,lprect)

#define w32_clear_area(f,hdc,px,py,nx,ny) \
w32_fill_area (f,hdc,f->output_data.x->background_pixel,px,py,nx,ny)

extern struct font_info *w32_load_font ();
extern void w32_unload_font ();

/* Define for earlier versions of Visual C */
#ifndef WM_MOUSEWHEEL
#define WM_MOUSEWHEEL 		       (WM_MOUSELAST + 1)
#endif /* WM_MOUSEWHEEL */
#ifndef MSH_MOUSEWHEEL
#define MSH_MOUSEWHEEL		       "MSWHEEL_ROLLMSG"
#endif /* MSH_MOUSEWHEEL */

#define WM_EMACS_START                 (WM_USER + 1)
#define WM_EMACS_KILL                  (WM_EMACS_START + 0)
#define WM_EMACS_CREATEWINDOW          (WM_EMACS_START + 1)
#define WM_EMACS_DONE                  (WM_EMACS_START + 2)
#define WM_EMACS_CREATESCROLLBAR       (WM_EMACS_START + 3)
#define WM_EMACS_SHOWWINDOW            (WM_EMACS_START + 4)
#define WM_EMACS_SETWINDOWPOS          (WM_EMACS_START + 5)
#define WM_EMACS_DESTROYWINDOW         (WM_EMACS_START + 6)
#define WM_EMACS_TRACKPOPUPMENU        (WM_EMACS_START + 7)
#define WM_EMACS_SETFOCUS              (WM_EMACS_START + 8)
#define WM_EMACS_SETFOREGROUND         (WM_EMACS_START + 9)
#define WM_EMACS_SETLOCALE             (WM_EMACS_START + 10)
#define WM_EMACS_SETKEYBOARDLAYOUT     (WM_EMACS_START + 11)
#define WM_EMACS_REGISTER_HOT_KEY      (WM_EMACS_START + 12)
#define WM_EMACS_UNREGISTER_HOT_KEY    (WM_EMACS_START + 13)
#define WM_EMACS_TOGGLE_LOCK_KEY       (WM_EMACS_START + 14)
#define WM_EMACS_END                   (WM_EMACS_START + 15)

#define WND_FONTWIDTH_INDEX    (0) 
#define WND_LINEHEIGHT_INDEX   (4) 
#define WND_BORDER_INDEX       (8) 
#define WND_SCROLLBAR_INDEX    (12) 
#define WND_BACKGROUND_INDEX   (16) 
#define WND_LAST_INDEX         (20)

#define WND_EXTRA_BYTES     (WND_LAST_INDEX)

extern DWORD dwWindowsThreadId;
extern HANDLE hWindowsThread;
extern DWORD dwMainThreadId;
extern HANDLE hMainThread;

typedef struct W32Msg {
    MSG msg;
    DWORD dwModifiers;
    RECT rect;
} W32Msg;

/* Structure for recording message when input thread must return a
   result that depends on lisp thread to compute.  Lisp thread can
   complete deferred messages out of order.  */
typedef struct deferred_msg
{
  struct deferred_msg * next;
  W32Msg                w32msg;
  LRESULT               result;
  int                   completed;
} deferred_msg;

extern CRITICAL_SECTION critsect;

extern void init_crit ();
extern void delete_crit ();

extern void signal_quit ();

#define enter_crit() EnterCriticalSection (&critsect)
#define leave_crit() LeaveCriticalSection (&critsect)

extern void select_palette (struct frame * f, HDC hdc);
extern void deselect_palette (struct frame * f, HDC hdc);
extern HDC get_frame_dc (struct frame * f);
extern int release_frame_dc (struct frame * f, HDC hDC);

extern void drain_message_queue ();

extern BOOL get_next_msg ();
extern BOOL post_msg ();
extern void complete_deferred_msg (HWND hwnd, UINT msg, LRESULT result);
extern void wait_for_sync ();

extern BOOL parse_button ();

/* Keypad command key support.  W32 doesn't have virtual keys defined
   for the function keys on the keypad (they are mapped to the standard
   fuction keys), so we define our own.  */
#define VK_NUMPAD_BEGIN		0x92
#define VK_NUMPAD_CLEAR		(VK_NUMPAD_BEGIN + 0)
#define VK_NUMPAD_ENTER		(VK_NUMPAD_BEGIN + 1)
#define VK_NUMPAD_PRIOR		(VK_NUMPAD_BEGIN + 2)
#define VK_NUMPAD_NEXT		(VK_NUMPAD_BEGIN + 3)
#define VK_NUMPAD_END		(VK_NUMPAD_BEGIN + 4)
#define VK_NUMPAD_HOME		(VK_NUMPAD_BEGIN + 5)
#define VK_NUMPAD_LEFT		(VK_NUMPAD_BEGIN + 6)
#define VK_NUMPAD_UP		(VK_NUMPAD_BEGIN + 7)
#define VK_NUMPAD_RIGHT		(VK_NUMPAD_BEGIN + 8)
#define VK_NUMPAD_DOWN		(VK_NUMPAD_BEGIN + 9)
#define VK_NUMPAD_INSERT	(VK_NUMPAD_BEGIN + 10)
#define VK_NUMPAD_DELETE	(VK_NUMPAD_BEGIN + 11)

#ifndef VK_LWIN
/* Older compiler environments don't have these defined.  */
#define VK_LWIN			0x5B
#define VK_RWIN			0x5C
#define VK_APPS			0x5D
#endif

/* Support for treating Windows and Apps keys as modifiers.  These
   constants must not overlap with any of the dwControlKeyState flags in
   KEY_EVENT_RECORD.  */
#define LEFT_WIN_PRESSED       0x8000
#define RIGHT_WIN_PRESSED      0x4000
#define APPS_PRESSED           0x2000

struct image;
struct face;

XGCValues *XCreateGC (void *, Window, unsigned long, XGCValues *);
struct frame * check_x_frame (Lisp_Object);
EXFUN (Fx_display_color_p, 1);
EXFUN (Fx_display_grayscale_p, 1);
int image_ascent P_ ((struct image *, struct face *));