dispextern.h 102 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Interface definitions for display code.
2
   Copyright (C) 1985, 1993, 1994, 1997, 1998, 1999, 2000, 2001, 2002,
Glenn Morris's avatar
Glenn Morris committed
3 4
                 2003, 2004, 2005, 2006, 2007, 2008
                 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
5 6 7 8 9

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
10
the Free Software Foundation; either version 3, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
11 12 13 14 15 16 17 18 19
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
Lute Kamstra's avatar
Lute Kamstra committed
20 21
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */
Jim Blandy's avatar
Jim Blandy committed
22

23
/* New redisplay written by Gerd Moellmann <gerd@gnu.org>.  */
Morten Welinder's avatar
Morten Welinder committed
24

Gerd Moellmann's avatar
Gerd Moellmann committed
25 26
#ifndef DISPEXTERN_H_INCLUDED
#define DISPEXTERN_H_INCLUDED
Jim Blandy's avatar
Jim Blandy committed
27 28

#ifdef HAVE_X_WINDOWS
29

30
#include <X11/Xlib.h>
31 32 33
#ifdef USE_X_TOOLKIT
#include <X11/Intrinsic.h>
#endif /* USE_X_TOOLKIT */
34 35 36 37 38 39 40 41 42 43 44 45

#else /* !HAVE_X_WINDOWS */

/* X-related stuff used by non-X gui code. */

typedef struct {
  unsigned long pixel;
  unsigned short red, green, blue;
  char flags;
  char pad;
} XColor;

46
#endif /* HAVE_X_WINDOWS */
Morten Welinder's avatar
Morten Welinder committed
47 48 49 50

#ifdef MSDOS
#include "msdos.h"
#endif
51

52 53
#ifdef HAVE_X_WINDOWS
typedef struct x_display_info Display_Info;
Kenichi Handa's avatar
Kenichi Handa committed
54 55
typedef XImage * XImagePtr;
typedef XImagePtr XImagePtr_or_DC;
56 57 58
#define NativeRectangle XRectangle
#endif

Geoff Voelker's avatar
Geoff Voelker committed
59
#ifdef HAVE_NTGUI
Geoff Voelker's avatar
Geoff Voelker committed
60
#include "w32gui.h"
61
typedef struct w32_display_info Display_Info;
Kenichi Handa's avatar
Kenichi Handa committed
62 63
typedef XImage *XImagePtr;
typedef HDC XImagePtr_or_DC;
Geoff Voelker's avatar
Geoff Voelker committed
64 65
#endif

66
#ifdef MAC_OS
67
#include "macgui.h"
68
typedef struct mac_display_info Display_Info;
Kenichi Handa's avatar
Kenichi Handa committed
69 70 71
/* Mac equivalent of XImage.  */
typedef Pixmap XImagePtr;
typedef XImagePtr XImagePtr_or_DC;
72
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
73

74 75 76 77
#ifndef NativeRectangle
#define NativeRectangle int
#endif

Gerd Moellmann's avatar
Gerd Moellmann committed
78 79 80 81 82 83 84 85 86 87 88 89 90
/* Structure forward declarations.  Some are here because function
   prototypes below reference structure types before their definition
   in this file.  Some are here because not every file including
   dispextern.h also includes frame.h and windows.h.  */

struct glyph;
struct glyph_row;
struct glyph_matrix;
struct glyph_pool;
struct frame;
struct window;


91 92 93 94 95 96 97 98 99 100 101 102
/* Values returned from coordinates_in_window.  */

enum window_part
{
  ON_NOTHING,
  ON_TEXT,
  ON_MODE_LINE,
  ON_VERTICAL_BORDER,
  ON_HEADER_LINE,
  ON_LEFT_FRINGE,
  ON_RIGHT_FRINGE,
  ON_LEFT_MARGIN,
103 104
  ON_RIGHT_MARGIN,
  ON_SCROLL_BAR
105 106
};

Kenichi Handa's avatar
Kenichi Handa committed
107
/* Number of bits allocated to store fringe bitmap numbers.  */
108
#define FRINGE_ID_BITS  16
Kenichi Handa's avatar
Kenichi Handa committed
109

110

Gerd Moellmann's avatar
Gerd Moellmann committed
111 112 113 114 115 116 117 118 119 120 121 122

/***********************************************************************
			      Debugging
 ***********************************************************************/

/* If GLYPH_DEBUG is non-zero, additional checks are activated.  Turn
   it off by defining the macro GLYPH_DEBUG to zero.  */

#ifndef GLYPH_DEBUG
#define GLYPH_DEBUG 0
#endif

123 124 125 126 127 128 129
/* If XASSERTS is non-zero, additional consistency checks are activated.
   Turn it off by defining the macro XASSERTS to zero.  */

#ifndef XASSERTS
#define XASSERTS 0
#endif

Gerd Moellmann's avatar
Gerd Moellmann committed
130 131 132 133 134 135 136 137
/* Macros to include code only if GLYPH_DEBUG != 0.  */

#if GLYPH_DEBUG
#define IF_DEBUG(X)	X
#else
#define IF_DEBUG(X)	(void) 0
#endif

138
#if XASSERTS
139
#define xassert(X)	do {if (!(X)) abort ();} while (0)
140 141 142
#else
#define xassert(X)	(void) 0
#endif
143

Gerd Moellmann's avatar
Gerd Moellmann committed
144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164
/* Macro for displaying traces of redisplay.  If Emacs was compiled
   with GLYPH_DEBUG != 0, the variable trace_redisplay_p can be set to
   a non-zero value in debugging sessions to activate traces.  */

#if GLYPH_DEBUG

extern int trace_redisplay_p;
#include <stdio.h>

#define TRACE(X)				\
     if (trace_redisplay_p)			\
       fprintf X;				\
     else					\
       (void) 0

#else /* GLYPH_DEBUG == 0 */

#define TRACE(X)	(void) 0

#endif /* GLYPH_DEBUG == 0 */

165

Gerd Moellmann's avatar
Gerd Moellmann committed
166 167 168 169 170 171 172 173

/***********************************************************************
			    Text positions
 ***********************************************************************/

/* Starting with Emacs 20.3, characters from strings and buffers have
   both a character and a byte position associated with them.  The
   following structure holds such a pair of positions.  */
174

Gerd Moellmann's avatar
Gerd Moellmann committed
175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195
struct text_pos
{
  /* Character position.  */
  int charpos;

  /* Corresponding byte position.  */
  int bytepos;
};

/* Access character and byte position of POS in a functional form.  */

#define BYTEPOS(POS)	(POS).bytepos
#define CHARPOS(POS)	(POS).charpos

/* Set character position of POS to CHARPOS, byte position to BYTEPOS.  */

#define SET_TEXT_POS(POS, CHARPOS, BYTEPOS) \
     ((POS).charpos = (CHARPOS), (POS).bytepos = BYTEPOS)

/* Increment text position POS.  */

196
#define INC_TEXT_POS(POS, MULTIBYTE_P)		\
Gerd Moellmann's avatar
Gerd Moellmann committed
197 198 199
     do						\
       {					\
	 ++(POS).charpos;			\
200 201 202 203
         if (MULTIBYTE_P)			\
	   INC_POS ((POS).bytepos);		\
	 else					\
	   ++(POS).bytepos;			\
Gerd Moellmann's avatar
Gerd Moellmann committed
204 205 206 207 208
       }					\
     while (0)

/* Decrement text position POS.  */

209
#define DEC_TEXT_POS(POS, MULTIBYTE_P)		\
Gerd Moellmann's avatar
Gerd Moellmann committed
210 211 212
     do						\
       {					\
	 --(POS).charpos;			\
213 214 215 216
         if (MULTIBYTE_P)			\
	   DEC_POS ((POS).bytepos);		\
	 else					\
	   --(POS).bytepos;			\
Gerd Moellmann's avatar
Gerd Moellmann committed
217 218 219 220 221 222 223 224 225 226 227 228 229
       }					\
     while (0)

/* Set text position POS from marker MARKER.  */

#define SET_TEXT_POS_FROM_MARKER(POS, MARKER)		\
     (CHARPOS (POS) = marker_position ((MARKER)),	\
      BYTEPOS (POS) = marker_byte_position ((MARKER)))

/* Set marker MARKER from text position POS.  */

#define SET_MARKER_FROM_TEXT_POS(MARKER, POS) \
     set_marker_both ((MARKER), Qnil, CHARPOS ((POS)), BYTEPOS ((POS)))
230

Gerd Moellmann's avatar
Gerd Moellmann committed
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
/* Value is non-zero if character and byte positions of POS1 and POS2
   are equal.  */

#define TEXT_POS_EQUAL_P(POS1, POS2)		\
     ((POS1).charpos == (POS2).charpos		\
      && (POS1).bytepos == (POS2).bytepos)

/* When rendering glyphs, redisplay scans string or buffer text,
   overlay strings in that text, and does display table or control
   character translations.  The following structure captures a
   position taking all this into account.  */

struct display_pos
{
  /* Buffer or string position.  */
  struct text_pos pos;

  /* If this is a position in an overlay string, overlay_string_index
     is the index of that overlay string in the sequence of overlay
     strings at `pos' in the order redisplay processes them.  A value
     < 0 means that this is not a position in an overlay string.  */
  int overlay_string_index;

  /* If this is a position in an overlay string, string_pos is the
     position within that string.  */
  struct text_pos string_pos;

  /* If the character at the position above is a control character or
     has a display table entry, dpvec_index is an index in the display
     table or control character translation of that character.  A
     value < 0 means this is not a position in such a translation.  */
  int dpvec_index;
};



/***********************************************************************
				Glyphs
 ***********************************************************************/

/* Enumeration of glyph types.  Glyph structures contain a type field
   containing one of the enumerators defined here.  */

enum glyph_type
{
  /* Glyph describes a character.  */
277
  CHAR_GLYPH,
Gerd Moellmann's avatar
Gerd Moellmann committed
278

279 280 281
  /* Glyph describes a composition sequence.  */
  COMPOSITE_GLYPH,

Gerd Moellmann's avatar
Gerd Moellmann committed
282 283 284 285 286 287 288 289
  /* Glyph describes an image.  */
  IMAGE_GLYPH,

  /* Glyph is a space of fractional width and/or height.  */
  STRETCH_GLYPH
};


290 291 292 293 294 295 296 297 298 299 300
/* Structure describing how to use partial glyphs (images slicing) */

struct glyph_slice
{
  unsigned x : 16;
  unsigned y : 16;
  unsigned width : 16;
  unsigned height : 16;
};


Gerd Moellmann's avatar
Gerd Moellmann committed
301 302 303
/* Glyphs.

   Be extra careful when changing this structure!  Esp. make sure that
304
   functions producing glyphs, like append_glyph, fill ALL of the
Gerd Moellmann's avatar
Gerd Moellmann committed
305 306 307
   glyph structure, and that GLYPH_EQUAL_P compares all
   display-relevant members of glyphs (not to imply that these are the
   only things to check when you add a member).  */
Gerd Moellmann's avatar
Gerd Moellmann committed
308 309 310 311 312 313 314 315 316 317 318

struct glyph
{
  /* Position from which this glyph was drawn.  If `object' below is a
     Lisp string, this is a position in that string.  If it is a
     buffer, this is a position in that buffer.  A value of -1
     together with a null object means glyph is a truncation glyph at
     the start of a row.  */
  int charpos;

  /* Lisp object source of this glyph.  Currently either a buffer or
319
     a string, if the glyph was produced from characters which came from
Gerd Moellmann's avatar
Gerd Moellmann committed
320 321
     a buffer or a string; or 0 if the glyph was inserted by redisplay
     for its own purposes such as padding.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
322 323 324 325 326
  Lisp_Object object;

  /* Width in pixels.  */
  short pixel_width;

Kenichi Handa's avatar
Kenichi Handa committed
327 328 329
  /* Ascent and descent in pixels.  */
  short ascent, descent;

Gerd Moellmann's avatar
Gerd Moellmann committed
330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348
  /* Vertical offset.  If < 0, the glyph is displayed raised, if > 0
     the glyph is displayed lowered.  */
  short voffset;

  /* Which kind of glyph this is---character, image etc.  Value
     should be an enumerator of type enum glyph_type.  */
  unsigned type : 2;

  /* 1 means this glyph was produced from multibyte text.  Zero
     means it was produced from unibyte text, i.e. charsets aren't
     applicable, and encoding is not performed.  */
  unsigned multibyte_p : 1;

  /* Non-zero means draw a box line at the left or right side of this
     glyph.  This is part of the implementation of the face attribute
     `:box'.  */
  unsigned left_box_line_p : 1;
  unsigned right_box_line_p : 1;

349 350 351 352 353
  /* Non-zero means this glyph's physical ascent or descent is greater
     than its logical ascent/descent, i.e. it may potentially overlap
     glyphs above or below it.  */
  unsigned overlaps_vertically_p : 1;

354 355 356 357 358 359 360 361 362 363
  /* For terminal frames, 1 means glyph is a padding glyph.  Padding
     glyphs are used for characters whose visual shape consists of
     more than one glyph (e.g. Asian characters).  All but the first
     glyph of such a glyph sequence have the padding_p flag set.  This
     flag is used only to minimize code changes.  A better way would
     probably be to use the width field of glyphs to express padding.

     For graphic frames, 1 means the pixel width of the glyph in a
     font is 0, but 1-pixel is padded on displaying for correct cursor
     displaying.  The member `pixel_width' above is set to 1.  */
364 365
  unsigned padding_p : 1;

Gerd Moellmann's avatar
Gerd Moellmann committed
366 367 368
  /* 1 means the actual glyph is not available, draw a box instead.
     This can happen when a font couldn't be loaded, or a character
     doesn't have a glyph in a font.  */
369 370
  unsigned glyph_not_available_p : 1;

Kenichi Handa's avatar
Kenichi Handa committed
371 372
#define FACE_ID_BITS	21

373 374
  /* Face of the glyph.  This is a realized face ID,
     an index in the face cache of the frame.  */
Kenichi Handa's avatar
Kenichi Handa committed
375
  unsigned face_id : FACE_ID_BITS;
376

377
  /* Type of font used to display the character glyph.  May be used to
378
     determine which set of functions to use to obtain font metrics
379 380 381
     for the glyph.  On W32, value should be an enumerator of the type
     w32_char_font_type.  Otherwise it equals FONT_TYPE_UNKNOWN.  */
  unsigned font_type : 3;
382

383 384
  struct glyph_slice slice;

Gerd Moellmann's avatar
Gerd Moellmann committed
385 386 387
  /* A union of sub-structures for different glyph types.  */
  union
  {
388 389
    /* Character code for character glyphs (type == CHAR_GLYPH).  */
    unsigned ch;
Gerd Moellmann's avatar
Gerd Moellmann committed
390

391 392
    /* Composition ID for composition glyphs (type == COMPOSITION_GLYPH)  */
    unsigned cmp_id;
393

394 395
    /* Image ID for image glyphs (type == IMAGE_GLYPH).  */
    unsigned img_id;
Gerd Moellmann's avatar
Gerd Moellmann committed
396 397 398 399 400

    /* Sub-structure for type == STRETCH_GLYPH.  */
    struct
    {
      /* The height of the glyph.  */
401
      unsigned height  : 16;
Gerd Moellmann's avatar
Gerd Moellmann committed
402 403

      /* The ascent of the glyph.  */
404
      unsigned ascent  : 16;
Gerd Moellmann's avatar
Gerd Moellmann committed
405 406
    }
    stretch;
407

Gerd Moellmann's avatar
Gerd Moellmann committed
408 409 410 411 412 413
    /* Used to compare all bit-fields above in one step.  */
    unsigned val;
  } u;
};


414 415 416 417
/* Default value of the glyph font_type field.  */

#define FONT_TYPE_UNKNOWN	0

Gerd Moellmann's avatar
Gerd Moellmann committed
418 419 420
/* Is GLYPH a space?  */

#define CHAR_GLYPH_SPACE_P(GLYPH) \
421
  ((GLYPH).u.ch == SPACEGLYPH && (GLYPH).face_id == DEFAULT_FACE_ID)
Gerd Moellmann's avatar
Gerd Moellmann committed
422

423 424 425 426 427 428 429 430
/* Are glyph slices of glyphs *X and *Y equal */

#define GLYPH_SLICE_EQUAL_P(X, Y)		\
  ((X)->slice.x == (Y)->slice.x			\
   && (X)->slice.y == (Y)->slice.y		\
   && (X)->slice.width == (Y)->slice.width	\
   && (X)->slice.height == (Y)->slice.height)

Gerd Moellmann's avatar
Gerd Moellmann committed
431
/* Are glyphs *X and *Y displayed equal?  */
432

Gerd Moellmann's avatar
Gerd Moellmann committed
433 434 435
#define GLYPH_EQUAL_P(X, Y)					\
     ((X)->type == (Y)->type					\
      && (X)->u.val == (Y)->u.val				\
436
      && GLYPH_SLICE_EQUAL_P (X, Y)				\
437 438
      && (X)->face_id == (Y)->face_id				\
      && (X)->padding_p == (Y)->padding_p			\
Gerd Moellmann's avatar
Gerd Moellmann committed
439 440
      && (X)->left_box_line_p == (Y)->left_box_line_p		\
      && (X)->right_box_line_p == (Y)->right_box_line_p		\
441 442
      && (X)->voffset == (Y)->voffset				\
      && (X)->pixel_width == (Y)->pixel_width)
Gerd Moellmann's avatar
Gerd Moellmann committed
443

444 445 446 447 448 449 450
/* Are character codes, faces, padding_ps of glyphs *X and *Y equal?  */

#define GLYPH_CHAR_AND_FACE_EQUAL_P(X, Y)	\
  ((X)->u.ch == (Y)->u.ch			\
   && (X)->face_id == (Y)->face_id		\
   && (X)->padding_p == (Y)->padding_p)

Gerd Moellmann's avatar
Gerd Moellmann committed
451 452
/* Fill a character glyph GLYPH.  CODE, FACE_ID, PADDING_P correspond
   to the bits defined for the typedef `GLYPH' in lisp.h.  */
453

Gerd Moellmann's avatar
Gerd Moellmann committed
454 455 456
#define SET_CHAR_GLYPH(GLYPH, CODE, FACE_ID, PADDING_P)	\
     do							\
       {						\
457 458 459
         (GLYPH).u.ch = (CODE);				\
         (GLYPH).face_id = (FACE_ID);			\
         (GLYPH).padding_p = (PADDING_P);		\
Gerd Moellmann's avatar
Gerd Moellmann committed
460 461 462 463 464
       }						\
     while (0)

/* Fill a character type glyph GLYPH from a glyph typedef FROM as
   defined in lisp.h.  */
465

Gerd Moellmann's avatar
Gerd Moellmann committed
466 467
#define SET_CHAR_GLYPH_FROM_GLYPH(GLYPH, FROM)			\
     SET_CHAR_GLYPH ((GLYPH),					\
Kim F. Storm's avatar
Kim F. Storm committed
468 469
	 	     GLYPH_CHAR ((FROM)),			\
		     GLYPH_FACE ((FROM)),			\
470
		     0)
Gerd Moellmann's avatar
Gerd Moellmann committed
471

472 473
/* Construct a glyph code from a character glyph GLYPH.  If the
   character is multibyte, return -1 as we can't use glyph table for a
Pavel Janík's avatar
Pavel Janík committed
474
   multibyte character.  */
475

Kim F. Storm's avatar
Kim F. Storm committed
476 477 478 479 480 481 482 483 484 485 486
#define SET_GLYPH_FROM_CHAR_GLYPH(G, GLYPH)			\
  do								\
    {								\
      if ((GLYPH).u.ch < 256)					\
	SET_GLYPH ((G), (GLYPH).u.ch, ((GLYPH).face_id));	\
      else							\
	SET_GLYPH ((G), -1, 0);					\
    }								\
  while (0)

#define GLYPH_INVALID_P(GLYPH) (GLYPH_CHAR (GLYPH) < 0)
Gerd Moellmann's avatar
Gerd Moellmann committed
487 488

/* Is GLYPH a padding glyph?  */
489

490
#define CHAR_GLYPH_PADDING_P(GLYPH) (GLYPH).padding_p
Gerd Moellmann's avatar
Gerd Moellmann committed
491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581




/***********************************************************************
			     Glyph Pools
 ***********************************************************************/

/* Glyph Pool.

   Glyph memory for frame-based redisplay is allocated from the heap
   in one vector kept in a glyph pool structure which is stored with
   the frame.  The size of the vector is made large enough to cover
   all windows on the frame.

   Both frame and window glyph matrices reference memory from a glyph
   pool in frame-based redisplay.

   In window-based redisplay, no glyphs pools exist; windows allocate
   and free their glyph memory themselves.  */

struct glyph_pool
{
  /* Vector of glyphs allocated from the heap.  */
  struct glyph *glyphs;

  /* Allocated size of `glyphs'.  */
  int nglyphs;

  /* Number of rows and columns in a matrix.  */
  int nrows, ncolumns;
};



/***********************************************************************
			     Glyph Matrix
 ***********************************************************************/

/* Glyph Matrix.

   Three kinds of glyph matrices exist:

   1. Frame glyph matrices.  These are used for terminal frames whose
   redisplay needs a view of the whole screen due to limited terminal
   capabilities.  Frame matrices are used only in the update phase
   of redisplay.  They are built in update_frame and not used after
   the update has been performed.

   2. Window glyph matrices on frames having frame glyph matrices.
   Such matrices are sub-matrices of their corresponding frame matrix,
   i.e. frame glyph matrices and window glyph matrices share the same
   glyph memory which is allocated in form of a glyph_pool structure.
   Glyph rows in such a window matrix are slices of frame matrix rows.

   2. Free-standing window glyph matrices managing their own glyph
   storage.  This form is used in window-based redisplay which
   includes variable width and height fonts etc.

   The size of a window's row vector depends on the height of fonts
   defined on its frame.  It is chosen so that the vector is large
   enough to describe all lines in a window when it is displayed in
   the smallest possible character size.  When new fonts are loaded,
   or window sizes change, the row vector is adjusted accordingly.  */

struct glyph_matrix
{
  /* The pool from which glyph memory is allocated, if any.  This is
     null for frame matrices and for window matrices managing their
     own storage.  */
  struct glyph_pool *pool;

  /* Vector of glyph row structures.  The row at nrows - 1 is reserved
     for the mode line.  */
  struct glyph_row *rows;

  /* Number of elements allocated for the vector rows above.  */
  int rows_allocated;

  /* The number of rows used by the window if all lines were displayed
     with the smallest possible character height.  */
  int nrows;

  /* Origin within the frame matrix if this is a window matrix on a
     frame having a frame matrix.  Both values are zero for
     window-based redisplay.  */
  int matrix_x, matrix_y;

  /* Width and height of the matrix in columns and rows.  */
  int matrix_w, matrix_h;

582
  /* If this structure describes a window matrix of window W,
583 584 585 586 587 588 589 590
     window_left_col is the value of W->left_col, window_top_line the
     value of W->top_line, window_height and window_width are width and
     height of W, as returned by window_box, and window_vscroll is the
     value of W->vscroll at the time the matrix was last adjusted.
     Only set for window-based redisplay.  */
  int window_left_col, window_top_line;
  int window_height, window_width;
  int window_vscroll;
Gerd Moellmann's avatar
Gerd Moellmann committed
591 592 593 594 595 596 597 598 599 600 601 602

  /* Number of glyphs reserved for left and right marginal areas when
     the matrix was last adjusted.  */
  int left_margin_glyphs, right_margin_glyphs;

  /* Flag indicating that scrolling should not be tried in
     update_window.  This flag is set by functions like try_window_id
     which do their own scrolling.  */
  unsigned no_scrolling_p : 1;

  /* Non-zero means window displayed in this matrix has a top mode
     line.  */
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
603
  unsigned header_line_p : 1;
Gerd Moellmann's avatar
Gerd Moellmann committed
604 605 606 607 608

#ifdef GLYPH_DEBUG
  /* A string identifying the method used to display the matrix.  */
  char method[512];
#endif
609

Gerd Moellmann's avatar
Gerd Moellmann committed
610 611
  /* The buffer this matrix displays.  Set in
     mark_window_display_accurate_1.  */
612 613
  struct buffer *buffer;

Gerd Moellmann's avatar
Gerd Moellmann committed
614 615
  /* Values of BEGV and ZV as of last redisplay.  Set in
     mark_window_display_accurate_1.  */
616
  int begv, zv;
Gerd Moellmann's avatar
Gerd Moellmann committed
617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651
};


/* Check that glyph pointers stored in glyph rows of MATRIX are okay.
   This aborts if any pointer is found twice.  */

#if GLYPH_DEBUG
void check_matrix_pointer_lossage P_ ((struct glyph_matrix *));
#define CHECK_MATRIX(MATRIX) check_matrix_pointer_lossage ((MATRIX))
#else
#define CHECK_MATRIX(MATRIX) (void) 0
#endif



/***********************************************************************
			     Glyph Rows
 ***********************************************************************/

/* Area in window glyph matrix.  If values are added or removed, the
   function mark_object in alloc.c has to be changed.  */

enum glyph_row_area
{
  LEFT_MARGIN_AREA,
  TEXT_AREA,
  RIGHT_MARGIN_AREA,
  LAST_AREA
};


/* Rows of glyphs in a windows or frame glyph matrix.

   Each row is partitioned into three areas.  The start and end of
   each area is recorded in a pointer as shown below.
652

Gerd Moellmann's avatar
Gerd Moellmann committed
653 654 655 656 657 658 659
   +--------------------+-------------+---------------------+
   |  left margin area  |  text area  |  right margin area  |
   +--------------------+-------------+---------------------+
   |                    |             |                     |
   glyphs[LEFT_MARGIN_AREA]           glyphs[RIGHT_MARGIN_AREA]
			|                                   |
			glyphs[TEXT_AREA]                   |
660
			                      glyphs[LAST_AREA]
Gerd Moellmann's avatar
Gerd Moellmann committed
661 662 663 664 665

   Rows in frame matrices reference glyph memory allocated in a frame
   glyph pool (see the description of struct glyph_pool).  Rows in
   window matrices on frames having frame matrices reference slices of
   the glyphs of corresponding rows in the frame matrix.
666

Gerd Moellmann's avatar
Gerd Moellmann committed
667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
   Rows in window matrices on frames having no frame matrices point to
   glyphs allocated from the heap via xmalloc;
   glyphs[LEFT_MARGIN_AREA] is the start address of the allocated
   glyph structure array.  */

struct glyph_row
{
  /* Pointers to beginnings of areas.  The end of an area A is found at
     A + 1 in the vector.  The last element of the vector is the end
     of the whole row.

     Kludge alert: Even if used[TEXT_AREA] == 0, glyphs[TEXT_AREA][0]'s
     position field is used.  It is -1 if this row does not correspond
     to any text; it is some buffer position if the row corresponds to
     an empty display line that displays a line end.  This is what old
     redisplay used to do.  (Except in code for terminal frames, this
Pavel Janík's avatar
Pavel Janík committed
683
     kludge is no longer used, I believe. --gerd).
Gerd Moellmann's avatar
Gerd Moellmann committed
684 685 686 687 688 689 690 691 692 693

     See also start, end, displays_text_p and ends_at_zv_p for cleaner
     ways to do it.  The special meaning of positions 0 and -1 will be
     removed some day, so don't use it in new code.  */
  struct glyph *glyphs[1 + LAST_AREA];

  /* Number of glyphs actually filled in areas.  */
  short used[LAST_AREA];

  /* Window-relative x and y-position of the top-left corner of this
Eli Zaretskii's avatar
Eli Zaretskii committed
694
     row.  If y < 0, this means that eabs (y) pixels of the row are
Gerd Moellmann's avatar
Gerd Moellmann committed
695
     invisible because it is partially visible at the top of a window.
Eli Zaretskii's avatar
Eli Zaretskii committed
696
     If x < 0, this means that eabs (x) pixels of the first glyph of
Gerd Moellmann's avatar
Gerd Moellmann committed
697 698 699 700 701
     the text area of the row are invisible because the glyph is
     partially visible.  */
  int x, y;

  /* Width of the row in pixels without taking face extension at the
Gerd Moellmann's avatar
Gerd Moellmann committed
702 703
     end of the row into account, and without counting truncation
     and continuation glyphs at the end of a row on ttys.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
704 705
  int pixel_width;

706 707
  /* Logical ascent/height of this line.  The value of ascent is zero
     and height is 1 on terminal frames.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
708 709
  int ascent, height;

710 711 712 713 714
  /* Physical ascent/height of this line.  If max_ascent > ascent,
     this line overlaps the line above it on the display.  Otherwise,
     if max_height > height, this line overlaps the line beneath it.  */
  int phys_ascent, phys_height;

Gerd Moellmann's avatar
Gerd Moellmann committed
715 716 717 718 719
  /* Portion of row that is visible.  Partially visible rows may be
     found at the top and bottom of a window.  This is 1 for tty
     frames.  It may be < 0 in case of completely invisible rows.  */
  int visible_height;

720 721 722 723
  /* Extra line spacing added after this row.  Do not consider this
     in last row when checking if row is fully visible.  */
  int extra_line_spacing;

Gerd Moellmann's avatar
Gerd Moellmann committed
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740
  /* Hash code.  This hash code is available as soon as the row
     is constructed, i.e. after a call to display_line.  */
  unsigned hash;

  /* First position in this row.  This is the text position, including
     overlay position information etc, where the display of this row
     started, and can thus be less the position of the first glyph
     (e.g. due to invisible text or horizontal scrolling).  */
  struct display_pos start;

  /* Text position at the end of this row.  This is the position after
     the last glyph on this row.  It can be greater than the last
     glyph position + 1, due to truncation, invisible text etc.  In an
     up-to-date display, this should always be equal to the start
     position of the next row.  */
  struct display_pos end;

741 742 743 744 745
  /* Non-zero means the overlay arrow bitmap is on this line.
     -1 means use default overlay arrow bitmap, else
     it specifies actual fringe bitmap number.  */
  int overlay_arrow_bitmap;

Kenichi Handa's avatar
Kenichi Handa committed
746 747 748 749 750 751 752 753 754 755 756 757
  /* Left fringe bitmap number (enum fringe_bitmap_type).  */
  unsigned left_user_fringe_bitmap : FRINGE_ID_BITS;

  /* Right fringe bitmap number (enum fringe_bitmap_type).  */
  unsigned right_user_fringe_bitmap : FRINGE_ID_BITS;

  /* Left fringe bitmap number (enum fringe_bitmap_type).  */
  unsigned left_fringe_bitmap : FRINGE_ID_BITS;

  /* Right fringe bitmap number (enum fringe_bitmap_type).  */
  unsigned right_fringe_bitmap : FRINGE_ID_BITS;

758 759 760 761 762 763 764 765 766
  /* Face of the left fringe glyph.  */
  unsigned left_user_fringe_face_id : FACE_ID_BITS;

  /* Face of the right fringe glyph.  */
  unsigned right_user_fringe_face_id : FACE_ID_BITS;

  /* Face of the left fringe glyph.  */
  unsigned left_fringe_face_id : FACE_ID_BITS;

Kenichi Handa's avatar
Kenichi Handa committed
767 768 769 770 771 772
  /* Face of the right fringe glyph.  */
  unsigned right_fringe_face_id : FACE_ID_BITS;

  /* 1 means that we must draw the bitmaps of this row.  */
  unsigned redraw_fringe_bitmaps_p : 1;

Gerd Moellmann's avatar
Gerd Moellmann committed
773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
  /* In a desired matrix, 1 means that this row must be updated.  In a
     current matrix, 0 means that the row has been invalidated, i.e.
     the row's contents do not agree with what is visible on the
     screen.  */
  unsigned enabled_p : 1;

  /* 1 means row displays a text line that is truncated on the left or
     right side.  */
  unsigned truncated_on_left_p : 1;
  unsigned truncated_on_right_p : 1;

  /* 1 means that this row displays a continued line, i.e. it has a
     continuation mark at the right side.  */
  unsigned continued_p : 1;

  /* 0 means that this row does not contain any text, i.e. it is
     a blank line at the window and buffer end.  */
  unsigned displays_text_p : 1;

  /* 1 means that this line ends at ZV.  */
  unsigned ends_at_zv_p : 1;

  /* 1 means the face of the last glyph in the text area is drawn to
     the right end of the window.  This flag is used in
     update_text_area to optimize clearing to the end of the area.  */
  unsigned fill_line_p : 1;

  /* Non-zero means display a bitmap on X frames indicating that this
     line contains no text and ends in ZV.  */
  unsigned indicate_empty_line_p : 1;

  /* 1 means this row contains glyphs that overlap each other because
     of lbearing or rbearing.  */
  unsigned contains_overlapping_glyphs_p : 1;

Pavel Janík's avatar
Pavel Janík committed
808
  /* 1 means this row is as wide as the window it is displayed in, including
Kim F. Storm's avatar
Kim F. Storm committed
809
     scroll bars, fringes, and internal borders.  This also
Gerd Moellmann's avatar
Gerd Moellmann committed
810 811 812
     implies that the row doesn't have marginal areas.  */
  unsigned full_width_p : 1;

Pavel Janík's avatar
Pavel Janík committed
813
  /* Non-zero means row is a mode or header-line.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
814 815
  unsigned mode_line_p : 1;

816 817 818
  /* 1 in a current row means this row is overlapped by another row.  */
  unsigned overlapped_p : 1;

819 820 821 822
  /* 1 means this line ends in the middle of a character consisting
     of more than one glyph.  Some glyphs have been put in this row,
     the rest are put in rows below this one.  */
  unsigned ends_in_middle_of_char_p : 1;
823

824 825
  /* 1 means this line starts in the middle of a character consisting
     of more than one glyph.  Some glyphs have been put in the
Pavel Janík's avatar
Pavel Janík committed
826
     previous row, the rest are put in this row.  */
827 828
  unsigned starts_in_middle_of_char_p : 1;

829 830 831
  /* 1 in a current row means this row overlaps others.  */
  unsigned overlapping_p : 1;

832 833 834
  /* 1 means some glyphs in this row are displayed in mouse-face.  */
  unsigned mouse_face_p : 1;

835 836 837
  /* 1 means this row was ended by a newline from a string.  */
  unsigned ends_in_newline_from_string_p : 1;

Kenichi Handa's avatar
Kenichi Handa committed
838 839 840 841 842 843 844
  /* 1 means this row width is exactly the width of the window, and the
     final newline character is hidden in the right fringe.  */
  unsigned exact_window_width_line_p : 1;

  /* 1 means this row currently shows the cursor in the right fringe.  */
  unsigned cursor_in_fringe_p : 1;

845 846 847
  /* 1 means the last glyph in the row is part of an ellipsis.  */
  unsigned ends_in_ellipsis_p : 1;

Kenichi Handa's avatar
Kenichi Handa committed
848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863
  /* Non-zero means display a bitmap on X frames indicating that this
     the first line of the buffer.  */
  unsigned indicate_bob_p : 1;

  /* Non-zero means display a bitmap on X frames indicating that this
     the top line of the window, but not start of the buffer.  */
  unsigned indicate_top_line_p : 1;

  /* Non-zero means display a bitmap on X frames indicating that this
     the last line of the buffer.  */
  unsigned indicate_eob_p : 1;

  /* Non-zero means display a bitmap on X frames indicating that this
     the bottom line of the window, but not end of the buffer.  */
  unsigned indicate_bottom_line_p : 1;

Gerd Moellmann's avatar
Gerd Moellmann committed
864 865
  /* Continuation lines width at the start of the row.  */
  int continuation_lines_width;
866

867
#ifdef HAVE_WINDOW_SYSTEM
868 869 870
  /* Non-NULL means the current clipping area.  This is temporarily
     set while exposing a region.  Coordinates are frame-relative.  */
  XRectangle *clip;
871
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
872 873 874 875 876 877 878 879 880 881 882 883 884 885
};


/* Get a pointer to row number ROW in matrix MATRIX.  If GLYPH_DEBUG
   is defined to a non-zero value, the function matrix_row checks that
   we don't try to access rows that are out of bounds.  */

#if GLYPH_DEBUG
struct glyph_row *matrix_row P_ ((struct glyph_matrix *, int));
#define MATRIX_ROW(MATRIX, ROW)   matrix_row ((MATRIX), (ROW))
#else
#define MATRIX_ROW(MATRIX, ROW)	  ((MATRIX)->rows + (ROW))
#endif

886
/* Return a pointer to the row reserved for the mode line in MATRIX.
Gerd Moellmann's avatar
Gerd Moellmann committed
887 888 889 890 891
   Row MATRIX->nrows - 1 is always reserved for the mode line.  */

#define MATRIX_MODE_LINE_ROW(MATRIX) \
     ((MATRIX)->rows + (MATRIX)->nrows - 1)

Pavel Janík's avatar
Pavel Janík committed
892
/* Return a pointer to the row reserved for the header line in MATRIX.
Gerd Moellmann's avatar
Gerd Moellmann committed
893 894 895
   This is always the first row in MATRIX because that's the only
   way that works in frame-based redisplay.  */

Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
896
#define MATRIX_HEADER_LINE_ROW(MATRIX) (MATRIX)->rows
Gerd Moellmann's avatar
Gerd Moellmann committed
897 898 899 900 901 902 903 904 905 906 907 908 909 910

/* Return a pointer to first row in MATRIX used for text display.  */

#define MATRIX_FIRST_TEXT_ROW(MATRIX) \
     ((MATRIX)->rows->mode_line_p ? (MATRIX)->rows + 1 : (MATRIX)->rows)

/* Return a pointer to the first glyph in the text area of a row.
   MATRIX is the glyph matrix accessed, and ROW is the row index in
   MATRIX.  */

#define MATRIX_ROW_GLYPH_START(MATRIX, ROW) \
     (MATRIX_ROW ((MATRIX), (ROW))->glyphs[TEXT_AREA])

/* Return the number of used glyphs in the text area of a row.  */
911

Gerd Moellmann's avatar
Gerd Moellmann committed
912 913 914 915 916
#define MATRIX_ROW_USED(MATRIX, ROW) \
     (MATRIX_ROW ((MATRIX), (ROW))->used[TEXT_AREA])

/* Return the character/ byte position at which the display of ROW
   starts.  */
917

Gerd Moellmann's avatar
Gerd Moellmann committed
918 919 920
#define MATRIX_ROW_START_CHARPOS(ROW) ((ROW)->start.pos.charpos)
#define MATRIX_ROW_START_BYTEPOS(ROW) ((ROW)->start.pos.bytepos)

Pavel Janík's avatar
Pavel Janík committed
921
/* Return the character/ byte position at which ROW ends.  */
922

Gerd Moellmann's avatar
Gerd Moellmann committed
923 924 925 926
#define MATRIX_ROW_END_CHARPOS(ROW) ((ROW)->end.pos.charpos)
#define MATRIX_ROW_END_BYTEPOS(ROW) ((ROW)->end.pos.bytepos)

/* Return the vertical position of ROW in MATRIX.  */
927

Gerd Moellmann's avatar
Gerd Moellmann committed
928 929 930 931 932
#define MATRIX_ROW_VPOS(ROW, MATRIX) ((ROW) - (MATRIX)->rows)

/* Return the last glyph row + 1 in MATRIX on window W reserved for
   text.  If W has a mode line, the last row in the matrix is reserved
   for it.  */
933

Gerd Moellmann's avatar
Gerd Moellmann committed
934 935 936 937 938 939 940
#define MATRIX_BOTTOM_TEXT_ROW(MATRIX, W)		\
     ((MATRIX)->rows					\
      + (MATRIX)->nrows					\
      - (WINDOW_WANTS_MODELINE_P ((W)) ? 1 : 0))

/* Non-zero if the face of the last glyph in ROW's text area has
   to be drawn to the end of the text area.  */
941

Gerd Moellmann's avatar
Gerd Moellmann committed
942 943 944
#define MATRIX_ROW_EXTENDS_FACE_P(ROW) ((ROW)->fill_line_p)

/* Set and query the enabled_p flag of glyph row ROW in MATRIX.  */
945

Gerd Moellmann's avatar
Gerd Moellmann committed
946 947
#define SET_MATRIX_ROW_ENABLED_P(MATRIX, ROW, VALUE) \
     (MATRIX_ROW ((MATRIX), (ROW))->enabled_p = (VALUE) != 0)
948

Gerd Moellmann's avatar
Gerd Moellmann committed
949 950 951 952 953
#define MATRIX_ROW_ENABLED_P(MATRIX, ROW) \
     (MATRIX_ROW ((MATRIX), (ROW))->enabled_p)

/* Non-zero if ROW displays text.  Value is non-zero if the row is
   blank but displays a line end.  */
954

Gerd Moellmann's avatar
Gerd Moellmann committed
955 956
#define MATRIX_ROW_DISPLAYS_TEXT_P(ROW) ((ROW)->displays_text_p)

957 958 959 960 961 962 963 964 965 966 967 968 969

/* Helper macros */

#define MR_PARTIALLY_VISIBLE(ROW)	\
  ((ROW)->height != (ROW)->visible_height)

#define MR_PARTIALLY_VISIBLE_AT_TOP(W, ROW)  \
  ((ROW)->y < WINDOW_HEADER_LINE_HEIGHT ((W)))

#define MR_PARTIALLY_VISIBLE_AT_BOTTOM(W, ROW)  \
  (((ROW)->y + (ROW)->height - (ROW)->extra_line_spacing) \
   > WINDOW_BOX_HEIGHT_NO_MODE_LINE ((W)))

Gerd Moellmann's avatar
Gerd Moellmann committed
970
/* Non-zero if ROW is not completely visible in window W.  */
971

972 973 974 975 976 977
#define MATRIX_ROW_PARTIALLY_VISIBLE_P(W, ROW)		\
  (MR_PARTIALLY_VISIBLE ((ROW))				\
   && (MR_PARTIALLY_VISIBLE_AT_TOP ((W), (ROW))		\
       || MR_PARTIALLY_VISIBLE_AT_BOTTOM ((W), (ROW))))


Gerd Moellmann's avatar
Gerd Moellmann committed
978 979

/* Non-zero if ROW is partially visible at the top of window W.  */
980

Gerd Moellmann's avatar
Gerd Moellmann committed
981
#define MATRIX_ROW_PARTIALLY_VISIBLE_AT_TOP_P(W, ROW)		\
982 983
  (MR_PARTIALLY_VISIBLE ((ROW))					\
   && MR_PARTIALLY_VISIBLE_AT_TOP ((W), (ROW)))
Gerd Moellmann's avatar
Gerd Moellmann committed
984 985

/* Non-zero if ROW is partially visible at the bottom of window W.  */
986

987 988 989
#define MATRIX_ROW_PARTIALLY_VISIBLE_AT_BOTTOM_P(W, ROW)	\
  (MR_PARTIALLY_VISIBLE ((ROW))					\
   && MR_PARTIALLY_VISIBLE_AT_BOTTOM ((W), (ROW)))
Gerd Moellmann's avatar
Gerd Moellmann committed
990 991

/* Return the bottom Y + 1 of ROW.   */
992

Gerd Moellmann's avatar
Gerd Moellmann committed
993 994 995 996
#define MATRIX_ROW_BOTTOM_Y(ROW) ((ROW)->y + (ROW)->height)

/* Is ROW the last visible one in the display described by the
   iterator structure pointed to by IT?.  */
997

Gerd Moellmann's avatar
Gerd Moellmann committed
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
#define MATRIX_ROW_LAST_VISIBLE_P(ROW, IT) \
     (MATRIX_ROW_BOTTOM_Y ((ROW)) >= (IT)->last_visible_y)

/* Non-zero if ROW displays a continuation line.  */

#define MATRIX_ROW_CONTINUATION_LINE_P(ROW) \
     ((ROW)->continuation_lines_width > 0)

/* Non-zero if ROW ends in the middle of a character.  This is the
   case for continued lines showing only part of a display table entry
   or a control char, or an overlay string.  */

#define MATRIX_ROW_ENDS_IN_MIDDLE_OF_CHAR_P(ROW)	\
1011
     ((ROW)->end.dpvec_index > 0			\
1012 1013
      || (ROW)->end.overlay_string_index >= 0		\
      || (ROW)->ends_in_middle_of_char_p)
Gerd Moellmann's avatar
Gerd Moellmann committed
1014 1015 1016 1017 1018 1019 1020

/* Non-zero if ROW ends in the middle of an overlay string.  */

#define MATRIX_ROW_ENDS_IN_OVERLAY_STRING_P(ROW) \
     ((ROW)->end.overlay_string_index >= 0)

/* Non-zero if ROW starts in the middle of a character.  See above.  */
1021

Gerd Moellmann's avatar
Gerd Moellmann committed
1022
#define MATRIX_ROW_STARTS_IN_MIDDLE_OF_CHAR_P(ROW)	\
1023
     ((ROW)->start.dpvec_index > 0			\
1024
      || (ROW)->starts_in_middle_of_char_p		\
Gerd Moellmann's avatar
Gerd Moellmann committed
1025 1026 1027
      || ((ROW)->start.overlay_string_index >= 0	\
	  && (ROW)->start.string_pos.charpos > 0))

1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038
/* Non-zero means ROW overlaps its predecessor.  */

#define MATRIX_ROW_OVERLAPS_PRED_P(ROW) \
     ((ROW)->phys_ascent > (ROW)->ascent)

/* Non-zero means ROW overlaps its successor.  */

#define MATRIX_ROW_OVERLAPS_SUCC_P(ROW)		\
      ((ROW)->phys_height - (ROW)->phys_ascent	\
       > (ROW)->height - (ROW)->ascent)

Gerd Moellmann's avatar
Gerd Moellmann committed
1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
/* Non-zero means that fonts have been loaded since the last glyph
   matrix adjustments.  The function redisplay_internal adjusts glyph
   matrices when this flag is non-zero.  */

extern int fonts_changed_p;

/* A glyph for a space.  */

extern struct glyph space_glyph;

/* Window being updated by update_window.  This is non-null as long as
1050
   update_window has not finished, and null otherwise.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084

extern struct window *updated_window;

/* Glyph row and area updated by update_window_line.  */

extern struct glyph_row *updated_row;
extern int updated_area;

/* Non-zero means reading single-character input with prompt so put
   cursor on mini-buffer after the prompt.  Positive means at end of
   text in echo area; negative means at beginning of line.  */

extern int cursor_in_echo_area;

/* Non-zero means last display completed.  Zero means it was
   preempted.  */

extern int display_completed;

/* Non-zero means redisplay has been performed directly (see also
   direct_output_for_insert and direct_output_forward_char), so that
   no further updating has to be performed.  The function
   redisplay_internal checks this flag, and does nothing but reset it
   to zero if it is non-zero.  */

extern int redisplay_performed_directly_p;

/* A temporary storage area, including a row of glyphs.  Initialized
   in xdisp.c.  Used for various purposes, as an example see
   direct_output_for_insert.  */

extern struct glyph_row scratch_glyph_row;


1085 1086 1087 1088 1089 1090

/************************************************************************
			  Glyph Strings
 ************************************************************************/

/* Enumeration for overriding/changing the face to use for drawing
1091
   glyphs in draw_glyphs.  */
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102

enum draw_glyphs_face
{
  DRAW_NORMAL_TEXT,
  DRAW_INVERSE_VIDEO,
  DRAW_CURSOR,
  DRAW_MOUSE_FACE,
  DRAW_IMAGE_RAISED,
  DRAW_IMAGE_SUNKEN
};

1103 1104
#ifdef HAVE_WINDOW_SYSTEM

1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
/* A sequence of glyphs to be drawn in the same face.  */

struct glyph_string
{
  /* X-origin of the string.  */
  int x;

  /* Y-origin and y-position of the base line of this string.  */
  int y, ybase;

  /* The width of the string, not including a face extension.  */
  int width;

  /* The width of the string, including a face extension.  */
  int background_width;

  /* The height of this string.  This is the height of the line this
     string is drawn in, and can be different from the height of the
     font the string is drawn in.  */
  int height;

  /* Number of pixels this string overwrites in front of its x-origin.
     This number is zero if the string has an lbearing >= 0; it is
     -lbearing, if the string has an lbearing < 0.  */
  int left_overhang;

  /* Number of pixels this string overwrites past its right-most
     nominal x-position, i.e. x + width.  Zero if the string's
     rbearing is <= its nominal width, rbearing - width otherwise.  */
  int right_overhang;

  /* The frame on which the glyph string is drawn.  */
  struct frame *f;

  /* The window on which the glyph string is drawn.  */
  struct window *w;

  /* X display and window for convenience.  */
  Display *display;
  Window window;

  /* The glyph row for which this string was built.  It determines the
     y-origin and height of the string.  */
  struct glyph_row *row;

  /* The area within row.  */
  enum glyph_row_area area;

  /* Characters to be drawn, and number of characters.  */
  XChar2b *char2b;
  int nchars;

  /* A face-override for drawing cursors, mouse face and similar.  */
  enum draw_glyphs_face hl;

  /* Face in which this string is to be drawn.  */
  struct face *face;

  /* Font in which this string is to be drawn.  */
  XFontStruct *font;

  /* Font info for this string.  */
  struct font_info *font_info;

  /* Non-null means this string describes (part of) a composition.
     All characters from char2b are drawn composed.  */
  struct composition *cmp;

  /* Index of this glyph string's first character in the glyph
     definition of CMP.  If this is zero, this glyph string describes
     the first character of a composition.  */
  int gidx;

  /* 1 means this glyph strings face has to be drawn to the right end
     of the window's drawing area.  */
  unsigned extends_to_end_of_line_p : 1;

  /* 1 means the background of this string has been drawn.  */
  unsigned background_filled_p : 1;

  /* 1 means glyph string must be drawn with 16-bit functions.  */
  unsigned two_byte_p : 1;

  /* 1 means that the original font determined for drawing this glyph
     string could not be loaded.  The member `font' has been set to
     the frame's default font in this case.  */
  unsigned font_not_found_p : 1;

  /* 1 means that the face in which this glyph string is drawn has a
     stipple pattern.  */
  unsigned stippled_p : 1;

1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
#define OVERLAPS_PRED		(1 << 0)
#define OVERLAPS_SUCC		(1 << 1)
#define OVERLAPS_BOTH		(OVERLAPS_PRED | OVERLAPS_SUCC)
#define OVERLAPS_ERASED_CURSOR 	(1 << 2)
  /* Non-zero means only the foreground of this glyph string must be
     drawn, and we should use the physical height of the line this
     glyph string appears in as clip rect.  If the value is
     OVERLAPS_ERASED_CURSOR, the clip rect is restricted to the rect
     of the erased cursor.  OVERLAPS_PRED and OVERLAPS_SUCC mean we
     draw overlaps with the preceding and the succeeding rows,
     respectively.  */
  unsigned for_overlaps : 3;
1209

1210 1211 1212 1213 1214
  /* 1 means that all glyphs in this glyph string has the flag
     padding_p set, and thus must be drawn one by one to have 1-pixel
     width even though the logical width in the font is zero.  */
  unsigned padding_p : 1;

1215
  /* The GC to use for drawing this glyph string.  */
1216
#if defined(HAVE_X_WINDOWS) || defined(MAC_OS)
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
  GC gc;
#endif
#if defined(HAVE_NTGUI)
  XGCValues *gc;
  HDC hdc;
#endif

  /* A pointer to the first glyph in the string.  This glyph
     corresponds to char2b[0].  Needed to draw rectangles if
     font_not_found_p is 1.  */
  struct glyph *first_glyph;

  /* Image, if any.  */
  struct image *img;

1232 1233 1234
  /* Slice */
  struct glyph_slice slice;

1235 1236 1237 1238 1239
  /* Non-null means the horizontal clipping region starts from the
     left edge of *clip_head, and ends with the right edge of
     *clip_tail, not including their overhangs.  */
  struct glyph_string *clip_head, *clip_tail;

1240 1241 1242 1243 1244
  /* The current clipping areas.  */
  NativeRectangle clip[2];

  /* Number of clipping areas. */
  int num_clips;
1245

1246 1247 1248
  struct glyph_string *next, *prev;
};

1249
#endif /* HAVE_WINDOW_SYSTEM */
1250

Gerd Moellmann's avatar
Gerd Moellmann committed
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264

/************************************************************************
			  Display Dimensions
 ************************************************************************/

/* Return the height of the mode line in glyph matrix MATRIX, or zero
   if not known.  This macro is called under circumstances where
   MATRIX might not have been allocated yet.  */

#define MATRIX_MODE_LINE_HEIGHT(MATRIX)		\
     ((MATRIX) && (MATRIX)->rows		\
      ? MATRIX_MODE_LINE_ROW (MATRIX)->height	\
      : 0)

Pavel Janík's avatar
Pavel Janík committed
1265
/* Return the height of the header line in glyph matrix MATRIX, or zero
Gerd Moellmann's avatar
Gerd Moellmann committed
1266 1267 1268
   if not known.  This macro is called under circumstances where
   MATRIX might not have been allocated yet.  */

Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
1269
#define MATRIX_HEADER_LINE_HEIGHT(MATRIX)	\
Gerd Moellmann's avatar
Gerd Moellmann committed
1270
     ((MATRIX) && (MATRIX)->rows		\
Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
1271
      ? MATRIX_HEADER_LINE_ROW (MATRIX)->height	\
Gerd Moellmann's avatar
Gerd Moellmann committed
1272 1273
      : 0)

1274 1275 1276 1277 1278 1279 1280 1281
/* Return the desired face id for the mode line of a window, depending
   on whether the window is selected or not, or if the window is the
   scrolling window for the currently active minibuffer window.

   Due to the way display_mode_lines manipulates with the contents of
   selected_window, this macro needs three arguments: SELW which is
   compared against the current value of selected_window, MBW which is
   compared against minibuf_window (if SELW doesn't match), and SCRW
1282
   which is compared against minibuf_selected_window (if MBW matches).  */
1283 1284

#define CURRENT_MODE_LINE_FACE_ID_3(SELW, MBW, SCRW)		\
1285
     ((!mode_line_in_non_selected_windows			\
1286
       || (SELW) == XWINDOW (selected_window)			\
1287
       || (minibuf_level > 0					\
1288
           && !NILP (minibuf_selected_window)			\
1289
           && (MBW) == XWINDOW (minibuf_window)			\
1290
           && (SCRW) == XWINDOW (minibuf_selected_window)))	\
1291 1292 1293 1294 1295
      ? MODE_LINE_FACE_ID					\
      : MODE_LINE_INACTIVE_FACE_ID)


/* Return the desired face id for the mode line of window W.  */
1296 1297

#define CURRENT_MODE_LINE_FACE_ID(W)		\
1298
	(CURRENT_MODE_LINE_FACE_ID_3((W), XWINDOW (selected_window), (W)))
1299

Gerd Moellmann's avatar
Gerd Moellmann committed
1300
/* Return the current height of the mode line of window W.  If not
Gerd Moellmann's avatar
Gerd Moellmann committed
1301 1302 1303 1304 1305 1306 1307 1308 1309 1310
   known from current_mode_line_height, look at W's current glyph
   matrix, or return a default based on the height of the font of the
   face `mode-line'.  */

#define CURRENT_MODE_LINE_HEIGHT(W)				\
     (current_mode_line_height >= 0				\
      ? current_mode_line_height				\
      : (MATRIX_MODE_LINE_HEIGHT ((W)->current_matrix)		\
	 ? MATRIX_MODE_LINE_HEIGHT ((W)->current_matrix)	\
	 : estimate_mode_line_height (XFRAME ((W)->frame),	\
1311
				      CURRENT_MODE_LINE_FACE_ID (W))))
Gerd Moellmann's avatar
Gerd Moellmann committed
1312

Pavel Janík's avatar
Pavel Janík committed
1313
/* Return the current height of the header line of window W.  If not
Gerd Moellmann's avatar
Gerd Moellmann committed
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324
   known from current_header_line_height, look at W's current glyph
   matrix, or return an estimation based on the height of the font of
   the face `header-line'.  */

#define CURRENT_HEADER_LINE_HEIGHT(W)				\
      (current_header_line_height >= 0				\
       ? current_header_line_height				\
       : (MATRIX_HEADER_LINE_HEIGHT ((W)->current_matrix)	\
	  ? MATRIX_HEADER_LINE_HEIGHT ((W)->current_matrix)	\
	  : estimate_mode_line_height (XFRAME ((W)->frame),	\
				       HEADER_LINE_FACE_ID)))
Gerd Moellmann's avatar
Gerd Moellmann committed
1325 1326 1327 1328 1329 1330

/* Return the height of the desired mode line of window W.  */

#define DESIRED_MODE_LINE_HEIGHT(W) \
     MATRIX_MODE_LINE_HEIGHT ((W)->desired_matrix)

Pavel Janík's avatar
Pavel Janík committed
1331
/* Return the height of the desired header line of window W.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
1332

Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
1333 1334
#define DESIRED_HEADER_LINE_HEIGHT(W) \
     MATRIX_HEADER_LINE_HEIGHT ((W)->desired_matrix)
Gerd Moellmann's avatar
Gerd Moellmann committed
1335

Pavel Janík's avatar
Pavel Janík committed
1336
/* Value is non-zero if window W wants a mode line.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
1337 1338

#define WINDOW_WANTS_MODELINE_P(W)					\
1339
     (!MINI_WINDOW_P ((W))						\
Gerd Moellmann's avatar
Gerd Moellmann committed
1340
      && !(W)->pseudo_window_p						\
1341
      && FRAME_WANTS_MODELINE_P (XFRAME (WINDOW_FRAME ((W))))		\
1342
      && BUFFERP ((W)->buffer)						\
1343
      && !NILP (XBUFFER ((W)->buffer)->mode_line_format)		\
1344
      && WINDOW_TOTAL_LINES (W) > 1)
Gerd Moellmann's avatar
Gerd Moellmann committed
1345

Pavel Janík's avatar
Pavel Janík committed
1346
/* Value is non-zero if window W wants a header line.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
1347

Gerd Moellmann's avatar
Change  
Gerd Moellmann committed
1348
#define WINDOW_WANTS_HEADER_LINE_P(W)					\