dispextern.h 113 KB
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/* Interface definitions for display code.
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Copyright (C) 1985, 1993-1994, 1997-2011  Free Software Foundation, Inc.
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This file is part of GNU Emacs.

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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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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
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along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
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/* New redisplay written by Gerd Moellmann <gerd@gnu.org>.  */
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#ifndef DISPEXTERN_H_INCLUDED
#define DISPEXTERN_H_INCLUDED
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#ifdef HAVE_X_WINDOWS
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#include <X11/Xlib.h>
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#ifdef USE_X_TOOLKIT
#include <X11/Intrinsic.h>
#endif /* USE_X_TOOLKIT */
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#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;

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#endif /* HAVE_X_WINDOWS */
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#ifdef MSDOS
#include "msdos.h"
#endif
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#ifdef HAVE_X_WINDOWS
typedef struct x_display_info Display_Info;
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typedef XImage * XImagePtr;
typedef XImagePtr XImagePtr_or_DC;
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#define NativeRectangle XRectangle
#endif

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#ifdef HAVE_NTGUI
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#include "w32gui.h"
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typedef struct w32_display_info Display_Info;
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typedef XImage *XImagePtr;
typedef HDC XImagePtr_or_DC;
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#endif

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#ifdef HAVE_NS
#include "nsgui.h"
/* following typedef needed to accomodate the MSDOS port, believe it or not */
typedef struct ns_display_info Display_Info;
typedef Pixmap XImagePtr;
typedef XImagePtr XImagePtr_or_DC;
#endif

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#ifndef HAVE_WINDOW_SYSTEM
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typedef int Cursor;
#define No_Cursor (0)
#endif

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#ifndef NativeRectangle
#define NativeRectangle int
#endif

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/* 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;


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/* 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,
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  ON_RIGHT_MARGIN,
  ON_SCROLL_BAR
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};

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/* Number of bits allocated to store fringe bitmap numbers.  */
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#define FRINGE_ID_BITS  16
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/* Number of bits allocated to store fringe bitmap height.  */
#define FRINGE_HEIGHT_BITS 8
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/***********************************************************************
			      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

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/* 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

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/* 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

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#if XASSERTS
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#define xassert(X)	do {if (!(X)) abort ();} while (0)
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#else
#define xassert(X)	(void) 0
#endif
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/* 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 */

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/***********************************************************************
			    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.  */
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struct text_pos
{
  /* Character position.  */
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  EMACS_INT charpos;
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  /* Corresponding byte position.  */
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  EMACS_INT bytepos;
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};

/* 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.  */

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#define INC_TEXT_POS(POS, MULTIBYTE_P)		\
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     do						\
       {					\
	 ++(POS).charpos;			\
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         if (MULTIBYTE_P)			\
	   INC_POS ((POS).bytepos);		\
	 else					\
	   ++(POS).bytepos;			\
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       }					\
     while (0)

/* Decrement text position POS.  */

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#define DEC_TEXT_POS(POS, MULTIBYTE_P)		\
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     do						\
       {					\
	 --(POS).charpos;			\
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         if (MULTIBYTE_P)			\
	   DEC_POS ((POS).bytepos);		\
	 else					\
	   --(POS).bytepos;			\
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       }					\
     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)))
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/* 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.  */
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  CHAR_GLYPH,
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  /* Glyph describes a static composition.  */
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  COMPOSITE_GLYPH,

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  /* Glyph describes a glyphless character.  */
  GLYPHLESS_GLYPH,

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  /* Glyph describes an image.  */
  IMAGE_GLYPH,

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


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/* Structure describing how to use partial glyphs (images slicing) */

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


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/* Glyphs.

   Be extra careful when changing this structure!  Esp. make sure that
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   functions producing glyphs, like append_glyph, fill ALL of the
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   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).  */
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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.  */
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  EMACS_INT charpos;
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  /* Lisp object source of this glyph.  Currently either a buffer or
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     a string, if the glyph was produced from characters which came from
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     a buffer or a string; or 0 if the glyph was inserted by redisplay
     for its own purposes such as padding.  */
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  Lisp_Object object;

  /* Width in pixels.  */
  short pixel_width;

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  /* Ascent and descent in pixels.  */
  short ascent, descent;

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  /* 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.  */
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  unsigned type : 3;
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  /* 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;

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  /* 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;

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  /* 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.  */
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  unsigned padding_p : 1;

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  /* 1 means the actual glyph is not available, draw using `struct
     glyphless' below instead.  This can happen when a font couldn't
     be loaded, or a character doesn't have a glyph in a font.  */
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  unsigned glyph_not_available_p : 1;

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  /* Non-zero means don't display cursor here.  */
  unsigned avoid_cursor_p : 1;

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  /* Resolved bidirectional level of this character [0..63].  */
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  unsigned resolved_level : 5;
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  /* Resolved bidirectional type of this character, see enum
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     bidi_type_t below.  Note that according to UAX#9, only some
     values (STRONG_L, STRONG_R, WEAK_AN, WEAK_EN, WEAK_BN, and
     NEUTRAL_B) can appear in the resolved type, so we only reserve
     space for those that can.  */
  unsigned bidi_type : 3;
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#define FACE_ID_BITS	20
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  /* Face of the glyph.  This is a realized face ID,
     an index in the face cache of the frame.  */
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  unsigned face_id : FACE_ID_BITS;
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  /* Type of font used to display the character glyph.  May be used to
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     determine which set of functions to use to obtain font metrics
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     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;
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  /* A union of sub-structures for different glyph types.  */
  union
  {
    /* Metrics of a partial glyph of an image (type == IMAGE_GLYPH).  */
    struct glyph_slice img;
    /* Start and end indices of glyphs of a graphme cluster of a
       composition (type == COMPOSITE_GLYPH).  */
    struct { int from, to; } cmp;
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    /* Pixel offsets for upper and lower part of the acronym.  */
    struct {
      short upper_xoff, upper_yoff;
      short lower_xoff, lower_yoff;
    } glyphless;
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  } slice;
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  /* A union of sub-structures for different glyph types.  */
  union
  {
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    /* Character code for character glyphs (type == CHAR_GLYPH).  */
    unsigned ch;
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    /* Sub-structures for type == COMPOSITE_GLYPH.  */
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    struct
    {
      /* Flag to tell if the composition is automatic or not.  */
      unsigned automatic : 1;
      /* ID of the composition.  */
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      unsigned id    : 31;
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    } cmp;
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    /* Image ID for image glyphs (type == IMAGE_GLYPH).  */
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    int img_id;
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    /* Sub-structure for type == STRETCH_GLYPH.  */
    struct
    {
      /* The height of the glyph.  */
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      unsigned height  : 16;
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      /* The ascent of the glyph.  */
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      unsigned ascent  : 16;
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    }
    stretch;
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    /* Sub-stretch for type == GLYPHLESS_GLYPH.  */
    struct
    {
      /* Value is an enum of the type glyphless_display_method.  */
      unsigned method : 2;
      /* 1 iff this glyph is for a character of no font. */
      unsigned for_no_font : 1;
      /* Length of acronym or hexadecimal code string (at most 8).  */
      unsigned len : 4;
      /* Character to display.  Actually we need only 22 bits.  */
      unsigned ch : 26;
    } glyphless;

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    /* Used to compare all bit-fields above in one step.  */
    unsigned val;
  } u;
};


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/* Default value of the glyph font_type field.  */

#define FONT_TYPE_UNKNOWN	0

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/* Is GLYPH a space?  */

#define CHAR_GLYPH_SPACE_P(GLYPH) \
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  ((GLYPH).u.ch == SPACEGLYPH && (GLYPH).face_id == DEFAULT_FACE_ID)
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/* Are glyph slices of glyphs *X and *Y equal?  It assumes that both
   glyphs have the same type.

   Note: for composition glyphs, we don't have to compare slice.cmp.to
   because they should be the same if and only if slice.cmp.from are
   the same.  */

#define GLYPH_SLICE_EQUAL_P(X, Y)				\
  ((X)->type == IMAGE_GLYPH					\
   ? ((X)->slice.img.x == (Y)->slice.img.x			\
      && (X)->slice.img.y == (Y)->slice.img.y			\
      && (X)->slice.img.width == (Y)->slice.img.width		\
      && (X)->slice.img.height == (Y)->slice.img.height)	\
   : ((X)->type != COMPOSITE_GLYPH				\
      || (X)->slice.cmp.from == (Y)->slice.cmp.from))
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/* Are glyphs *X and *Y displayed equal?  */
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#define GLYPH_EQUAL_P(X, Y)					\
     ((X)->type == (Y)->type					\
      && (X)->u.val == (Y)->u.val				\
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      && GLYPH_SLICE_EQUAL_P (X, Y)				\
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      && (X)->face_id == (Y)->face_id				\
      && (X)->padding_p == (Y)->padding_p			\
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      && (X)->left_box_line_p == (Y)->left_box_line_p		\
      && (X)->right_box_line_p == (Y)->right_box_line_p		\
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      && (X)->voffset == (Y)->voffset				\
      && (X)->pixel_width == (Y)->pixel_width)
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/* 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)

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/* Fill a character glyph GLYPH.  CODE, FACE_ID, PADDING_P correspond
   to the bits defined for the typedef `GLYPH' in lisp.h.  */
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#define SET_CHAR_GLYPH(GLYPH, CODE, FACE_ID, PADDING_P)	\
     do							\
       {						\
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         (GLYPH).u.ch = (CODE);				\
         (GLYPH).face_id = (FACE_ID);			\
         (GLYPH).padding_p = (PADDING_P);		\
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       }						\
     while (0)

/* Fill a character type glyph GLYPH from a glyph typedef FROM as
   defined in lisp.h.  */
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#define SET_CHAR_GLYPH_FROM_GLYPH(GLYPH, FROM)			\
     SET_CHAR_GLYPH ((GLYPH),					\
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	 	     GLYPH_CHAR ((FROM)),			\
		     GLYPH_FACE ((FROM)),			\
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		     0)
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/* 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
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   multibyte character.  */
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#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)
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/* Is GLYPH a padding glyph?  */
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#define CHAR_GLYPH_PADDING_P(GLYPH) (GLYPH).padding_p
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/***********************************************************************
			     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;

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  /* If this structure describes a window matrix of window W,
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     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;
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  /* 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.  */
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  unsigned header_line_p : 1;
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#if GLYPH_DEBUG
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  /* A string identifying the method used to display the matrix.  */
  char method[512];
#endif
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  /* The buffer this matrix displays.  Set in
     mark_window_display_accurate_1.  */
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  struct buffer *buffer;

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  /* Values of BEGV and ZV as of last redisplay.  Set in
     mark_window_display_accurate_1.  */
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  int begv, zv;
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};


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

#if GLYPH_DEBUG
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void check_matrix_pointer_lossage (struct glyph_matrix *);
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#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.
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   +--------------------+-------------+---------------------+
   |  left margin area  |  text area  |  right margin area  |
   +--------------------+-------------+---------------------+
   |                    |             |                     |
   glyphs[LEFT_MARGIN_AREA]           glyphs[RIGHT_MARGIN_AREA]
			|                                   |
			glyphs[TEXT_AREA]                   |
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			                      glyphs[LAST_AREA]
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   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.
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   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
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     kludge is no longer used, I believe. --gerd).
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     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
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     row.  If y < 0, this means that eabs (y) pixels of the row are
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     invisible because it is partially visible at the top of a window.
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     If x < 0, this means that eabs (x) pixels of the first glyph of
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     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
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     end of the row into account, and without counting truncation
     and continuation glyphs at the end of a row on ttys.  */
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  int pixel_width;

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  /* Logical ascent/height of this line.  The value of ascent is zero
     and height is 1 on terminal frames.  */
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  int ascent, height;

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  /* 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;

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  /* 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;

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  /* 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;

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  /* 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
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     started, and can thus be less than the position of the first
     glyph (e.g. due to invisible text or horizontal scrolling).
     BIDI Note: In R2L rows, that have its reversed_p flag set, this
     position is at or beyond the right edge of the row.  */
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  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
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     glyph position + 1, due to a newline that ends the line,
     truncation, invisible text etc.  In an up-to-date display, this
     should always be equal to the start position of the next row.
     BIDI Note: In R2L rows, this position is at or beyond the left
     edge of the row.  */
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  struct display_pos end;

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  /* The smallest and the largest buffer positions that contributed to
     glyphs in this row.  Note that due to bidi reordering, these are
     in general different from the text positions stored in `start'
     and `end' members above, and also different from the buffer
     positions recorded in the glyphs displayed the leftmost and
     rightmost on the screen.  */
  struct text_pos minpos, maxpos;

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  /* 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;

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  /* 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;

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  /* 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;

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

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  /* Vertical offset of the left fringe bitmap.  */
  signed left_fringe_offset : FRINGE_HEIGHT_BITS;

  /* Vertical offset of the right fringe bitmap.  */
  signed right_fringe_offset : FRINGE_HEIGHT_BITS;

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

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  /* 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;

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  /* 1 means this row is as wide as the window it is displayed in, including
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     scroll bars, fringes, and internal borders.  This also
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     implies that the row doesn't have marginal areas.  */
  unsigned full_width_p : 1;

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  /* Non-zero means row is a mode or header-line.  */
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  unsigned mode_line_p : 1;

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

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  /* 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;
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  /* 1 means this line starts in the middle of a character consisting
     of more than one glyph.  Some glyphs have been put in the
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     previous row, the rest are put in this row.  */
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  unsigned starts_in_middle_of_char_p : 1;

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

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

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

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  /* 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;

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

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  /* 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;

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  /* Non-zero means the row was reversed to display text in a
     right-to-left paragraph.  */
  unsigned reversed_p : 1;

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  /* Continuation lines width at the start of the row.  */
  int continuation_lines_width;
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#ifdef HAVE_WINDOW_SYSTEM
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  /* Non-NULL means the current clipping area.  This is temporarily
     set while exposing a region.  Coordinates are frame-relative.  */
  XRectangle *clip;
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#endif
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};


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

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/* Return a pointer to the row reserved for the mode line in MATRIX.
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   Row MATRIX->nrows - 1 is always reserved for the mode line.  */

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

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/* Return a pointer to the row reserved for the header line in MATRIX.
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   This is always the first row in MATRIX because that's the only
   way that works in frame-based redisplay.  */

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#define MATRIX_HEADER_LINE_ROW(MATRIX) (MATRIX)->rows
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/* 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.  */
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#define MATRIX_ROW_USED(MATRIX, ROW) \
     (MATRIX_ROW ((MATRIX), (ROW))->used[TEXT_AREA])

/* Return the character/ byte position at which the display of ROW
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   starts.  BIDI Note: this is the smallest character/byte position
   among characters in ROW, i.e. the first logical-order character
   displayed by ROW, which is not necessarily the smallest horizontal
   position.  */
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#define MATRIX_ROW_START_CHARPOS(ROW) ((ROW)->minpos.charpos)
#define MATRIX_ROW_START_BYTEPOS(ROW) ((ROW)->minpos.bytepos)
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/* Return the character/ byte position at which ROW ends.  BIDI Note:
   this is the largest character/byte position among characters in
   ROW, i.e. the last logical-order character displayed by ROW, which
   is not necessarily the largest horizontal position.  */
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#define MATRIX_ROW_END_CHARPOS(ROW) ((ROW)->maxpos.charpos)
#define MATRIX_ROW_END_BYTEPOS(ROW) ((ROW)->maxpos.bytepos)
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/* Return the vertical position of ROW in MATRIX.  */
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#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.  */
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#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.  */
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#define MATRIX_ROW_EXTENDS_FACE_P(ROW) ((ROW)->fill_line_p)

/* Set and query the enabled_p flag of glyph row ROW in MATRIX.  */
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#define SET_MATRIX_ROW_ENABLED_P(MATRIX, ROW, VALUE) \
     (MATRIX_ROW ((MATRIX), (ROW))->enabled_p = (VALUE) != 0)
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#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.  */
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#define MATRIX_ROW_DISPLAYS_TEXT_P(ROW) ((ROW)->displays_text_p)

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/* 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)))

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/* Non-zero if ROW is not completely visible in window W.  */
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#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))))


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/* Non-zero if ROW is partially visible at the top of window W.  */
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#define MATRIX_ROW_PARTIALLY_VISIBLE_AT_TOP_P(W, ROW)		\
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  (MR_PARTIALLY_VISIBLE ((ROW))					\
   && MR_PARTIALLY_VISIBLE_AT_TOP ((W), (ROW)))
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/* Non-zero if ROW is partially visible at the bottom of window W.  */
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#define MATRIX_ROW_PARTIALLY_VISIBLE_AT_BOTTOM_P(W, ROW)	\
  (MR_PARTIALLY_VISIBLE ((ROW))					\
   && MR_PARTIALLY_VISIBLE_AT_BOTTOM ((W), (ROW)))
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/* Return the bottom Y + 1 of ROW.   */
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#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?.  */
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#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)	\
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     ((ROW)->end.dpvec_index > 0			\
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      || (ROW)->end.overlay_string_index >= 0		\
      || (ROW)->ends_in_middle_of_char_p)
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/* 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.  */
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#define MATRIX_ROW_STARTS_IN_MIDDLE_OF_CHAR_P(ROW)	\
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     ((ROW)->start.dpvec_index > 0			\
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      || (ROW)->starts_in_middle_of_char_p		\
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      || ((ROW)->start.overlay_string_index >= 0	\
	  && (ROW)->start.string_pos.charpos > 0))

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/* 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)

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/* 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
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   update_window has not finished, and null otherwise.  */
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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 last display completed.  Zero means it was
   preempted.  */

extern int display_completed;

/* A temporary storage area, including a row of glyphs.  Initialized
   in xdisp.c.  Used for various purposes, as an example see
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   get_overlay_arrow_glyph_row.  */
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extern struct glyph_row scratch_glyph_row;


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/************************************************************************
			  Glyph Strings
 ************************************************************************/

/* Enumeration for overriding/changing the face to use for drawing
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   glyphs in draw_glyphs.  */
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enum draw_glyphs_face
{
  DRAW_NORMAL_TEXT,
  DRAW_INVERSE_VIDEO,
  DRAW_CURSOR,
  DRAW_MOUSE_FACE,
  DRAW_IMAGE_RAISED,
  DRAW_IMAGE_SUNKEN
};

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#ifdef HAVE_WINDOW_SYSTEM

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/* 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.  */
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  struct font *font;
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  /* Non-null means this string describes (part of) a static
     composition.  */
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  struct composition *cmp;

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  /* If not negative, this string describes a compos.  */
  int cmp_id;

  /* Start and end glyph indices in a glyph-string.  */
  int cmp_from, cmp_to;
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  /* 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;

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#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;
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  /* 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;

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  /* The GC to use for drawing this glyph string.  */
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#if defined(HAVE_X_WINDOWS)
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  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;

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  /* Slice */
  struct glyph_slice slice;

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  /* 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;

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  /* The current clipping areas.  */
  NativeRectangle clip[2];

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

  int underline_thickness;

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  struct glyph_string *next, *prev;
};