gtktextlayout.c 65.5 KB
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/* gtktextlayout.c - calculate the layout of the text
 *
 * Copyright (c) 1992-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 * Copyright (c) 2000 Red Hat, Inc.
 * Tk->Gtk port by Havoc Pennington
 * Pango support by Owen Taylor
 *
 *
 * This software is copyrighted by the Regents of the University of
 * California, Sun Microsystems, Inc., and other parties.  The
 * following terms apply to all files associated with the software
 * unless explicitly disclaimed in individual files.
 * 
 * The authors hereby grant permission to use, copy, modify,
 * distribute, and license this software and its documentation for any
 * purpose, provided that existing copyright notices are retained in
 * all copies and that this notice is included verbatim in any
 * distributions. No written agreement, license, or royalty fee is
 * required for any of the authorized uses.  Modifications to this
 * software may be copyrighted by their authors and need not follow
 * the licensing terms described here, provided that the new terms are
 * clearly indicated on the first page of each file where they apply.
 * 
 * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
 * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
 * OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
 * NON-INFRINGEMENT.  THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
 * AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
 * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 *
 * GOVERNMENT USE: If you are acquiring this software on behalf of the
 * U.S. government, the Government shall have only "Restricted Rights"
 * in the software and related documentation as defined in the Federal
 * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2).  If you
 * are acquiring the software on behalf of the Department of Defense,
 * the software shall be classified as "Commercial Computer Software"
 * and the Government shall have only "Restricted Rights" as defined
 * in Clause 252.227-7013 (c) (1) of DFARs.  Notwithstanding the
 * foregoing, the authors grant the U.S. Government and others acting
 * in its behalf permission to use and distribute the software in
 * accordance with the terms specified in this license.
 * 
 */

#include "gtksignal.h"
#include "gtktextlayout.h"
#include "gtktextbtree.h"
#include "gtktextiterprivate.h"

#include <stdlib.h>
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#include <string.h>
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static GtkTextLineData    *gtk_text_line_data_new                 (GtkTextLayout     *layout,
								   GtkTextLine       *line);

static GtkTextLineData *gtk_text_layout_real_wrap (GtkTextLayout *layout,
                                                     GtkTextLine *line,
                                                     /* may be NULL */
                                                     GtkTextLineData *line_data);

static void gtk_text_layout_real_get_log_attrs (GtkTextLayout  *layout,
						GtkTextLine    *line,
						PangoLogAttr  **attrs,
						gint           *n_attrs);

static void gtk_text_layout_invalidated     (GtkTextLayout     *layout);

static void gtk_text_layout_real_invalidate     (GtkTextLayout     *layout,
						 const GtkTextIter *start,
						 const GtkTextIter *end);
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static void gtk_text_layout_invalidate_cache    (GtkTextLayout     *layout,
						 GtkTextLine       *line);
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static void gtk_text_layout_real_free_line_data (GtkTextLayout     *layout,
						 GtkTextLine       *line,
						 GtkTextLineData   *line_data);

static void gtk_text_layout_invalidate_all (GtkTextLayout *layout);

static PangoAttribute *gtk_text_attr_appearance_new (const GtkTextAppearance *appearance);

enum {
  INVALIDATED,
  CHANGED,
  LAST_SIGNAL
};

enum {
  ARG_0,
  LAST_ARG
};

static void gtk_text_layout_init (GtkTextLayout *text_layout);
static void gtk_text_layout_class_init (GtkTextLayoutClass *klass);
static void gtk_text_layout_destroy (GtkObject *object);
static void gtk_text_layout_finalize (GObject *object);

void gtk_marshal_NONE__INT_INT_INT_INT (GtkObject  *object,
                                        GtkSignalFunc func,
                                        gpointer func_data,
                                        GtkArg  *args);

static GtkObjectClass *parent_class = NULL;
static guint signals[LAST_SIGNAL] = { 0 };

PangoAttrType gtk_text_attr_appearance_type = 0;

GtkType
gtk_text_layout_get_type (void)
{
  static GtkType our_type = 0;

  if (our_type == 0)
    {
      static const GtkTypeInfo our_info =
      {
        "GtkTextLayout",
        sizeof (GtkTextLayout),
        sizeof (GtkTextLayoutClass),
        (GtkClassInitFunc) gtk_text_layout_class_init,
        (GtkObjectInitFunc) gtk_text_layout_init,
        /* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL
      };

    our_type = gtk_type_unique (GTK_TYPE_OBJECT, &our_info);
  }

  return our_type;
}

static void
gtk_text_layout_class_init (GtkTextLayoutClass *klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GtkObjectClass *object_class = GTK_OBJECT_CLASS (klass);

  parent_class = gtk_type_class (GTK_TYPE_OBJECT);

  signals[INVALIDATED] =
    gtk_signal_new ("invalidated",
                    GTK_RUN_LAST,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextLayoutClass, invalidated),
                    gtk_marshal_NONE__NONE,
                    GTK_TYPE_NONE,
                    0);

  signals[CHANGED] =
    gtk_signal_new ("changed",
                    GTK_RUN_LAST,
                    GTK_CLASS_TYPE (object_class),
                    GTK_SIGNAL_OFFSET (GtkTextLayoutClass, changed),
                    gtk_marshal_NONE__INT_INT_INT,
                    GTK_TYPE_NONE,
                    3,
                    GTK_TYPE_INT,
                    GTK_TYPE_INT,
                    GTK_TYPE_INT);

  gtk_object_class_add_signals (object_class, signals, LAST_SIGNAL);
  
  object_class->destroy = gtk_text_layout_destroy;
  gobject_class->finalize = gtk_text_layout_finalize;

  klass->wrap = gtk_text_layout_real_wrap;
  klass->get_log_attrs = gtk_text_layout_real_get_log_attrs;
  klass->invalidate = gtk_text_layout_real_invalidate;
  klass->free_line_data = gtk_text_layout_real_free_line_data;
}

void
gtk_text_layout_init (GtkTextLayout *text_layout)
{
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  text_layout->cursor_visible = TRUE;
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}

GtkTextLayout*
gtk_text_layout_new (void)
{
  return GTK_TEXT_LAYOUT (gtk_type_new (gtk_text_layout_get_type ()));
}

static void
free_style_cache (GtkTextLayout *text_layout)
{
  if (text_layout->one_style_cache)
    {
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      gtk_text_attributes_unref (text_layout->one_style_cache);
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      text_layout->one_style_cache = NULL;
    }
}

static void
gtk_text_layout_destroy (GtkObject *object)
{
  GtkTextLayout *layout;

  layout = GTK_TEXT_LAYOUT (object);

  gtk_text_layout_set_buffer (layout, NULL);  

  if (layout->default_style)
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    gtk_text_attributes_unref (layout->default_style);
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  layout->default_style = NULL;

  if (layout->ltr_context)
    {
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      g_object_unref (G_OBJECT (layout->ltr_context));
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      layout->ltr_context = NULL;
    }
  if (layout->rtl_context)
    {
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      g_object_unref (G_OBJECT (layout->rtl_context));
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      layout->rtl_context = NULL;
    }
  
  (* parent_class->destroy) (object);
}

static void
gtk_text_layout_finalize (GObject *object)
{
  GtkTextLayout *text_layout;

  text_layout = GTK_TEXT_LAYOUT (object);

  (* G_OBJECT_CLASS (parent_class)->finalize) (object);
}

void
gtk_text_layout_set_buffer (GtkTextLayout *layout,
                            GtkTextBuffer *buffer)
{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (buffer == NULL || GTK_IS_TEXT_BUFFER (buffer));
  
  if (layout->buffer == buffer)
    return;

  free_style_cache (layout);
  
  if (layout->buffer)
    {
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      gtk_text_btree_remove_view (_gtk_text_buffer_get_btree (layout->buffer),
                                  layout);
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      gtk_object_unref (GTK_OBJECT (layout->buffer));
      layout->buffer = NULL;
    }

  if (buffer)
    {
      layout->buffer = buffer;

      gtk_object_sink (GTK_OBJECT (buffer));
      gtk_object_ref (GTK_OBJECT (buffer));

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      gtk_text_btree_add_view (_gtk_text_buffer_get_btree (buffer), layout);
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    }
}

void
gtk_text_layout_default_style_changed (GtkTextLayout *layout)
{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  
  gtk_text_layout_invalidate_all (layout);
}

void
gtk_text_layout_set_default_style (GtkTextLayout *layout,
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                                   GtkTextAttributes *values)
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{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (values != NULL);

  if (values == layout->default_style)
    return;

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  gtk_text_attributes_ref (values);
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  if (layout->default_style)
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    gtk_text_attributes_unref (layout->default_style);
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  layout->default_style = values;

  gtk_text_layout_default_style_changed (layout);
}

void
gtk_text_layout_set_contexts (GtkTextLayout *layout,
			      PangoContext  *ltr_context,
			      PangoContext  *rtl_context)
{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));

  if (layout->ltr_context)
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    g_object_unref (G_OBJECT (ltr_context));
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  layout->ltr_context = ltr_context;
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  g_object_ref (G_OBJECT (ltr_context));
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  if (layout->rtl_context)
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    g_object_unref (G_OBJECT (rtl_context));
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  layout->rtl_context = rtl_context;
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  g_object_ref (G_OBJECT (rtl_context));
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  gtk_text_layout_invalidate_all (layout);
}

void
gtk_text_layout_set_screen_width (GtkTextLayout *layout, gint width)
{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (width >= 0);
  g_return_if_fail (layout->wrap_loop_count == 0);
  
  if (layout->screen_width == width)
    return;
  
  layout->screen_width = width;
  
  gtk_text_layout_invalidate_all (layout);
}

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/**
 * gtk_text_layout_set_cursor_visible:
 * @layout: a #GtkTextLayout
 * @cursor_visible: If %FALSE, then the insertion cursor will not
 *   be shown, even if the text is editable. 
 * 
 * Sets whether the insertion cursor should be shown. Generally,
 * widgets using #GtkTextLayout will hide the cursor when the
 * widget does not have the input focus.
 **/
void
gtk_text_layout_set_cursor_visible (GtkTextLayout *layout,
				    gboolean       cursor_visible)
{
  cursor_visible = (cursor_visible != FALSE);

  if (layout->cursor_visible != cursor_visible)
    {
      GtkTextIter iter;
      gint y, height;
      
      layout->cursor_visible = cursor_visible;

      /* Now queue a redraw on the paragraph containing the cursor
       */
      gtk_text_buffer_get_iter_at_mark (layout->buffer, &iter,
					gtk_text_buffer_get_mark (layout->buffer, "insert"));

      gtk_text_layout_get_line_yrange (layout, &iter, &y, &height);
      gtk_text_layout_changed (layout, y, height, height);

      gtk_text_layout_invalidate_cache (layout, gtk_text_iter_get_text_line (&iter));
    }
}

/**
 * gtk_text_layout_get_cursor_visible:
 * @layout: a #GtkTextLayout
 * 
 * Returns whether the insertion cursor will be shown.
 * 
 * Return value: if %FALSE, the insertion cursor will not be
    shown, even if the text is editable.
 **/
gboolean
gtk_text_layout_get_cursor_visible (GtkTextLayout *layout)
{
  return layout->cursor_visible;
}

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void
gtk_text_layout_get_size (GtkTextLayout *layout,
                          gint *width,
                          gint *height)
{
  gint w, h;
  
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  
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  gtk_text_btree_get_view_size (_gtk_text_buffer_get_btree (layout->buffer),
                                layout,
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                                &w, &h);

  layout->width = w;
  layout->height = h;
  
  if (width)
    *width = layout->width;

  if (height)
    *height = layout->height;
}

static void
gtk_text_layout_invalidated (GtkTextLayout *layout)
{
  gtk_signal_emit (GTK_OBJECT (layout), signals[INVALIDATED]);
}

void
gtk_text_layout_changed (GtkTextLayout *layout,
			 gint           y,
			 gint           old_height,
			 gint           new_height)
{
  gtk_signal_emit (GTK_OBJECT (layout), signals[CHANGED], y, old_height, new_height);
}

void
gtk_text_layout_free_line_data (GtkTextLayout     *layout,
				GtkTextLine       *line,
				GtkTextLineData   *line_data)
{
  (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->free_line_data)
    (layout, line, line_data);
}

void
gtk_text_layout_invalidate (GtkTextLayout *layout,
                            const GtkTextIter *start_index,
                            const GtkTextIter *end_index)
{
  (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->invalidate)
    (layout, start_index, end_index);
}

GtkTextLineData*
gtk_text_layout_wrap (GtkTextLayout *layout,
                       GtkTextLine  *line,
                       /* may be NULL */
                       GtkTextLineData *line_data)
{
  return (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->wrap) (layout, line, line_data);
}

void
gtk_text_layout_get_log_attrs (GtkTextLayout  *layout,
			       GtkTextLine    *line,
			       PangoLogAttr  **attrs,
			       gint           *n_attrs)
{
  (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->get_log_attrs)
    (layout, line, attrs, n_attrs);
}

GSList*
gtk_text_layout_get_lines (GtkTextLayout *layout,
                           /* [top_y, bottom_y) */
                           gint top_y, 
                           gint bottom_y,
                           gint *first_line_y)
{
  GtkTextLine *first_btree_line;
  GtkTextLine *last_btree_line;
  GtkTextLine *line;
  GSList *retval;
  
  g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), NULL);
  g_return_val_if_fail (bottom_y > top_y, NULL);

  retval = NULL;
  
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  first_btree_line =
    gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
                                   layout, top_y, first_line_y);
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  if (first_btree_line == NULL)
    {
      g_assert (top_y > 0);
      /* off the bottom */
      return NULL;
    }
  
  /* -1 since bottom_y is one past */
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  last_btree_line =
    gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
                                   layout, bottom_y - 1, NULL);
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  if (!last_btree_line)
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    last_btree_line =
      gtk_text_btree_get_line (_gtk_text_buffer_get_btree (layout->buffer),
                               gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1,
                               NULL);
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  {
    GtkTextLineData *ld = gtk_text_line_get_data (last_btree_line, layout);
    if (ld->height == 0)
      G_BREAKPOINT();
  }
  
  g_assert (last_btree_line != NULL);

  line = first_btree_line;
  while (TRUE)
    {
      retval = g_slist_prepend (retval, line);

      if (line == last_btree_line)
        break;
      
      line = gtk_text_line_next (line);
    }
  
  retval = g_slist_reverse (retval);

  return retval;
}

static void
invalidate_cached_style (GtkTextLayout *layout)
{
  free_style_cache (layout);
}

/* These should be called around a loop which wraps a CONTIGUOUS bunch
 * of display lines. If the lines aren't contiguous you can't call
 * these.
 */
void
gtk_text_layout_wrap_loop_start (GtkTextLayout *layout)
{
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (layout->one_style_cache == NULL);
  
  layout->wrap_loop_count += 1;
}

void
gtk_text_layout_wrap_loop_end (GtkTextLayout *layout)
{
  g_return_if_fail (layout->wrap_loop_count > 0);
  
  layout->wrap_loop_count -= 1;

  if (layout->wrap_loop_count == 0)
    {
      /* We cache a some stuff if we're iterating over some lines wrapping
       * them. This cleans it up.
       */
      /* Nuke our cached style */
      invalidate_cached_style (layout);
      g_assert (layout->one_style_cache == NULL);
    }
}

static void
gtk_text_layout_invalidate_all (GtkTextLayout *layout)
{
  GtkTextIter start;
  GtkTextIter end;
  
  if (layout->buffer == NULL)
    return;

  gtk_text_buffer_get_bounds (layout->buffer, &start, &end);

  gtk_text_layout_invalidate (layout, &start, &end);
}

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static void
gtk_text_layout_invalidate_cache (GtkTextLayout *layout,
				  GtkTextLine   *line)
{
  if (layout->one_display_cache && line == layout->one_display_cache->line)
    {
      GtkTextLineDisplay *tmp_display = layout->one_display_cache;
      layout->one_display_cache = NULL;
      gtk_text_layout_free_line_display (layout, tmp_display);
    }
}

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static void
gtk_text_layout_real_invalidate (GtkTextLayout *layout,
                                 const GtkTextIter *start,
                                 const GtkTextIter *end)
{
  GtkTextLine *line;
  GtkTextLine *last_line;
  
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (layout->wrap_loop_count == 0);

#if 0
  gtk_text_view_index_spew (start_index, "invalidate start");
  gtk_text_view_index_spew (end_index, "invalidate end");
#endif
  
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  last_line = gtk_text_iter_get_text_line (end);
  line = gtk_text_iter_get_text_line (start);
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  while (TRUE)
    {
      GtkTextLineData *line_data = gtk_text_line_get_data (line, layout);

      if (line_data &&
	  (line != last_line || !gtk_text_iter_starts_line (end)))
	{
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	  gtk_text_layout_invalidate_cache (layout, line);
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	  gtk_text_line_invalidate_wrap (line, line_data);
	}
      
      if (line == last_line)
        break;
      
      line = gtk_text_line_next (line);
    }
  
  gtk_text_layout_invalidated (layout);
}

static void
gtk_text_layout_real_free_line_data (GtkTextLayout     *layout,
				     GtkTextLine       *line,
				     GtkTextLineData   *line_data)
{
  if (layout->one_display_cache && line == layout->one_display_cache->line)
    {
      GtkTextLineDisplay *tmp_display = layout->one_display_cache;
      layout->one_display_cache = NULL;
      gtk_text_layout_free_line_display (layout, tmp_display);
    }
  
  g_free (line_data);
}



/**
 * gtk_text_layout_is_valid:
 * @layout: a #GtkTextLayout
 * 
 * Check if there are any invalid regions in a #GtkTextLayout's buffer
 * 
 * Return value: #TRUE if any invalid regions were found
 **/
gboolean
gtk_text_layout_is_valid (GtkTextLayout *layout)
{
  g_return_val_if_fail (layout != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE);
  
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  return gtk_text_btree_is_valid (_gtk_text_buffer_get_btree (layout->buffer),
                                  layout);
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}

/**
 * gtk_text_layout_validate_yrange:
 * @layout: a #GtkTextLayout
 * @anchor: iter pointing into a line that will be used as the
 *          coordinate origin
 * @y0: offset from the top of the line pointed to by @anchor at
 *      which to begin validation. (The offset here is in pixels
 *      after validation.)
 * @y1: offset from the top of the line pointed to by @anchor at
 *      which to end validation. (The offset here is in pixels
 *      after validation.)
 * 
 * Ensure that a region of a #GtkTextLayout is valid. The ::changed 
 * signal will be emitted if any lines are validated.
 **/
void
gtk_text_layout_validate_yrange (GtkTextLayout *layout,
				 GtkTextIter   *anchor,
				 gint           y0,
				 gint           y1)
{
  GtkTextLine *line;
  GtkTextLine *first_line = NULL;
  GtkTextLine *last_line = NULL;
  gint seen;
  gint delta_height = 0;
  gint first_line_y = 0;	/* Quiet GCC */
  gint last_line_y = 0;		/* Quiet GCC */
  
  g_return_if_fail (layout != NULL);
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  
  if (y0 > 0)
    y0 = 0;
  if (y1 < 0)
    y1 = 0;
  
  /* Validate backwards from the anchor line to y0
   */
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  line = gtk_text_iter_get_text_line (anchor);
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  seen = 0;
  while (line && seen < -y0)
    {
      GtkTextLineData *line_data = gtk_text_line_get_data (line, layout);
      if (!line_data || !line_data->valid)
	{
	  gint old_height = line_data ? line_data->height : 0;
	  
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	  gtk_text_btree_validate_line (_gtk_text_buffer_get_btree (layout->buffer),
                                        line, layout);
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	  line_data = gtk_text_line_get_data (line, layout);

	  delta_height += line_data->height - old_height;

	  first_line = line;
	  first_line_y = -seen;
	  if (!last_line)
	    {
	      last_line = line;
	      last_line_y = -seen + line_data->height;
	    }
	}
      
      seen += line_data->height;
      line = gtk_text_line_previous (line);
    }

  /* Validate forwards to y1 */
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  line = gtk_text_iter_get_text_line (anchor);
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  seen = 0;
  while (line && seen < y1)
    {
      GtkTextLineData *line_data = gtk_text_line_get_data (line, layout);
      if (!line_data || !line_data->valid)
	{
	  gint old_height = line_data ? line_data->height : 0;
	  
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	  gtk_text_btree_validate_line (_gtk_text_buffer_get_btree (layout->buffer),
                                        line, layout);
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	  line_data = gtk_text_line_get_data (line, layout);

	  delta_height += line_data->height - old_height;

	  if (!first_line)
	    {
	      first_line = line;
	      first_line_y = seen;
	    }
	  last_line = line;
	  last_line_y = seen + line_data->height;
	}
      
      seen += line_data->height;
      line = gtk_text_line_next (line);
    }

  /* If we found and validated any invalid lines, emit the changed singal
   */
  if (first_line)
    {
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      gint line_top =
        gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
                                      first_line, layout);            
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      gtk_text_layout_changed (layout,
			       line_top,
			       last_line_y - first_line_y - delta_height,
			       last_line_y - first_line_y);
    }
}

/**
 * gtk_text_layout_validate:
 * @tree: a #GtkTextLayout
 * @max_pixels: the maximum number of pixels to validate. (No more
 *              than one paragraph beyond this limit will be validated)
 * 
 * Validate regions of a #GtkTextLayout. The ::changed signal will
 * be emitted for each region validated.
 **/
void
gtk_text_layout_validate (GtkTextLayout *layout,
			  gint           max_pixels)
{
  gint y, old_height, new_height;

  g_return_if_fail (layout != NULL);
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  
  while (max_pixels > 0 &&
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	 gtk_text_btree_validate (_gtk_text_buffer_get_btree (layout->buffer),
                                  layout,  max_pixels,
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				  &y, &old_height, &new_height))
    {
      max_pixels -= new_height;
      gtk_text_layout_changed (layout, y, old_height, new_height);
    }
}

static GtkTextLineData*
gtk_text_layout_real_wrap (GtkTextLayout   *layout,
			   GtkTextLine     *line,
                            /* may be NULL */
			   GtkTextLineData *line_data)
{
  GtkTextLineDisplay *display;
  
  g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), NULL);
  
  if (line_data == NULL)
    {
      line_data = gtk_text_line_data_new (layout, line);
      gtk_text_line_add_data (line, line_data);
    }

  display = gtk_text_layout_get_line_display (layout, line, TRUE);
  line_data->width = display->width;
  line_data->height = display->height;
  line_data->valid = TRUE;
  gtk_text_layout_free_line_display (layout, display);

  return line_data;
}

static void
gtk_text_layout_real_get_log_attrs (GtkTextLayout  *layout,
				    GtkTextLine    *line,
				    PangoLogAttr  **attrs,
				    gint           *n_attrs)
{
  GtkTextLineDisplay *display;
  
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  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
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  display = gtk_text_layout_get_line_display (layout, line, TRUE);
  pango_layout_get_log_attrs (display->layout, attrs, n_attrs);
  gtk_text_layout_free_line_display (layout, display);
}

/*
 * Layout utility functions
 */

/* If you get the style with get_style () you need to call
   release_style () to free it. */
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static GtkTextAttributes*
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get_style (GtkTextLayout *layout,
	   const GtkTextIter *iter)
{
  GtkTextTag** tags;
  gint tag_count = 0;
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  GtkTextAttributes *style;
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  /* If we have the one-style cache, then it means
     that we haven't seen a toggle since we filled in the
     one-style cache.
  */
  if (layout->one_style_cache != NULL)
    {
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      gtk_text_attributes_ref (layout->one_style_cache);
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      return layout->one_style_cache;
    }

  g_assert (layout->one_style_cache == NULL);
  
  /* Get the tags at this spot */
  tags = gtk_text_btree_get_tags (iter, &tag_count);

  /* No tags, use default style */
  if (tags == NULL || tag_count == 0)
    {
      /* One ref for the return value, one ref for the
         layout->one_style_cache reference */
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      gtk_text_attributes_ref (layout->default_style);
      gtk_text_attributes_ref (layout->default_style);
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      layout->one_style_cache = layout->default_style;

      if (tags)
        g_free (tags);

      return layout->default_style;
    }
  
  /* Sort tags in ascending order of priority */
  gtk_text_tag_array_sort (tags, tag_count);
  
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  style = gtk_text_attributes_new ();
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  gtk_text_attributes_copy (layout->default_style,
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                              style);
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  gtk_text_attributes_fill_from_tags (style,
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                                        tags,
                                        tag_count);
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  g_free (tags);

  g_assert (style->refcount == 1);

  /* Leave this style as the last one seen */
  g_assert (layout->one_style_cache == NULL);
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  gtk_text_attributes_ref (style); /* ref held by layout->one_style_cache */
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  layout->one_style_cache = style;
  
  /* Returning yet another refcount */
  return style;
}

static void
release_style (GtkTextLayout *layout,
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	       GtkTextAttributes *style)
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{
  g_return_if_fail (style != NULL);
  g_return_if_fail (style->refcount > 0);

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  gtk_text_attributes_unref (style);
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}

/*
 * Lines
 */

/* This function tries to optimize the case where a line
   is completely invisible */
static gboolean
totally_invisible_line (GtkTextLayout *layout,
			GtkTextLine   *line,
			GtkTextIter   *iter)
{
  GtkTextLineSegment *seg;
  int bytes = 0;
  
  /* If we have a cached style, then we know it does actually apply
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     and we can just see if it is invisible. */
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  if (layout->one_style_cache &&
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      !layout->one_style_cache->invisible)
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    return FALSE;
  /* Without the cache, we check if the first char is visible, if so
     we are partially visible.  Note that we have to check this since
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     we don't know the current invisible/noninvisible toggle state; this
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     function can use the whole btree to get it right. */
  else
    {
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      gtk_text_btree_get_iter_at_line(_gtk_text_buffer_get_btree (layout->buffer),
                                      iter, line, 0);
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      if (!gtk_text_btree_char_is_invisible (iter))
	return FALSE;
    }

  bytes = 0;
  seg = line->segments;

  while (seg != NULL)
    {
      if (seg->byte_count > 0)
        bytes += seg->byte_count;

      /* Note that these two tests can cause us to bail out
         when we shouldn't, because a higher-priority tag
         may override these settings. However the important
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         thing is to only invisible really-invisible lines, rather
         than to invisible all really-invisible lines. */
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      else if (seg->type == &gtk_text_toggle_on_type)
        {
          invalidate_cached_style (layout);
          
          /* Bail out if an elision-unsetting tag begins */
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          if (seg->body.toggle.info->tag->invisible_set &&
              !seg->body.toggle.info->tag->values->invisible)
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            break;
        }
      else if (seg->type == &gtk_text_toggle_off_type)
        {
          invalidate_cached_style (layout);
          
          /* Bail out if an elision-setting tag ends */
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          if (seg->body.toggle.info->tag->invisible_set &&
              seg->body.toggle.info->tag->values->invisible)
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            break;
        }

      seg = seg->next;
    }

  if (seg != NULL)       /* didn't reach line end */
    return FALSE;

  return TRUE;
}

static void
set_para_values (GtkTextLayout      *layout,
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		 GtkTextAttributes *style,
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		 GtkTextLineDisplay *display,
		 gdouble            *align)
{
  PangoAlignment pango_align = PANGO_ALIGN_LEFT;
  int layout_width;

  display->direction = style->direction;

  if (display->direction == GTK_TEXT_DIR_LTR)
    display->layout = pango_layout_new (layout->ltr_context);
  else
    display->layout = pango_layout_new (layout->rtl_context);

  switch (style->justify)
    {
    case GTK_JUSTIFY_LEFT:
      pango_align = (style->direction == GTK_TEXT_DIR_LTR) ? PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT;
      break;
    case GTK_JUSTIFY_RIGHT:
      pango_align = (style->direction == GTK_TEXT_DIR_LTR) ? PANGO_ALIGN_RIGHT : PANGO_ALIGN_LEFT;
      break;
    case GTK_JUSTIFY_CENTER:
      pango_align = PANGO_ALIGN_CENTER;
      break;
    case GTK_JUSTIFY_FILL:
      g_warning ("FIXME we don't support GTK_JUSTIFY_FILL yet");
      break;
    default:
      g_assert_not_reached ();
      break;
    }

  switch (pango_align)
    {
      case PANGO_ALIGN_LEFT:
	*align = 0.0;
	break;
      case PANGO_ALIGN_RIGHT:
	*align = 1.0;
	break;
      case PANGO_ALIGN_CENTER:
	*align = 0.5;
	break;
    }

  pango_layout_set_alignment (display->layout, pango_align);
  pango_layout_set_spacing (display->layout, style->pixels_inside_wrap * PANGO_SCALE);

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  if (style->tabs)
    pango_layout_set_tabs (display->layout, style->tabs);
  
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  display->top_margin = style->pixels_above_lines;
  display->height = style->pixels_above_lines + style->pixels_below_lines;
  display->bottom_margin = style->pixels_below_lines;
  display->x_offset = display->left_margin = MIN (style->left_margin, style->left_wrapped_line_margin);
  display->right_margin = style->right_margin;

  pango_layout_set_indent (display->layout, style->left_margin - style->left_wrapped_line_margin);

  switch (style->wrap_mode)
    {
    case GTK_WRAPMODE_CHAR:
      /* FIXME: Handle this; for now, fall-through */
    case GTK_WRAPMODE_WORD:
      display->total_width = -1;
      layout_width = layout->screen_width - display->x_offset - style->right_margin;
      pango_layout_set_width (display->layout, layout_width * PANGO_SCALE);
      break;
    case GTK_WRAPMODE_NONE:
      display->total_width = MAX (layout->screen_width, layout->width) - display->x_offset - style->right_margin;
      break;
    }
}

static PangoAttribute *
gtk_text_attr_appearance_copy (const PangoAttribute *attr)
{
  const GtkTextAttrAppearance *appearance_attr = (const GtkTextAttrAppearance *)attr;
  
  return gtk_text_attr_appearance_new (&appearance_attr->appearance);
}

static void
gtk_text_attr_appearance_destroy (PangoAttribute *attr)
{
  GtkTextAppearance *appearance = &((GtkTextAttrAppearance *)attr)->appearance;

  if (appearance->bg_stipple)
    gdk_drawable_unref (appearance->bg_stipple);
  if (appearance->fg_stipple)
    gdk_drawable_unref (appearance->fg_stipple);
  
  g_free (attr);
}

static gboolean
gtk_text_attr_appearance_compare (const PangoAttribute *attr1,
				  const PangoAttribute *attr2)
{
  const GtkTextAppearance *appearance1 = &((const GtkTextAttrAppearance *)attr1)->appearance;
  const GtkTextAppearance *appearance2 = &((const GtkTextAttrAppearance *)attr2)->appearance;

  return (gdk_color_equal (&appearance1->fg_color, &appearance2->fg_color) &&
	  gdk_color_equal (&appearance1->bg_color, &appearance2->bg_color) &&
	  appearance1->fg_stipple ==  appearance2->fg_stipple &&
	  appearance1->bg_stipple ==  appearance2->bg_stipple &&
	  appearance1->underline == appearance2->underline &&
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	  appearance1->strikethrough == appearance2->strikethrough &&
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	  appearance1->draw_bg == appearance2->draw_bg);
	  
}

/**
 * gtk_text_attr_appearance_new:
 * @desc: 
 * 
 * Create a new font description attribute. (This attribute
 * allows setting family, style, weight, variant, stretch,
 * and size simultaneously.)
 * 
 * Return value: 
 **/
static PangoAttribute *
gtk_text_attr_appearance_new (const GtkTextAppearance *appearance)
{
  static PangoAttrClass klass = {
    0,
    gtk_text_attr_appearance_copy,
    gtk_text_attr_appearance_destroy,
    gtk_text_attr_appearance_compare
  };

  GtkTextAttrAppearance *result;

  if (!klass.type)
    klass.type = gtk_text_attr_appearance_type =
      pango_attr_type_register ("GtkTextAttrAppearance");

  result = g_new (GtkTextAttrAppearance, 1);
  result->attr.klass = &klass;

  result->appearance = *appearance;
    
  if (appearance->bg_stipple)
    gdk_drawable_ref (appearance->bg_stipple);
  if (appearance->fg_stipple)
    gdk_drawable_ref (appearance->fg_stipple);

  return (PangoAttribute *)result;
}

static void
add_text_attrs (GtkTextLayout      *layout,
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		GtkTextAttributes *style,
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		gint                byte_count,
		PangoAttrList      *attrs,
		gint                start,
		gboolean            size_only)
{
  PangoAttribute *attr;

  attr = pango_attr_font_desc_new (style->font_desc);
  attr->start_index = start;
  attr->end_index = start + byte_count;

  pango_attr_list_insert (attrs, attr);

  if (!size_only)
    {
      attr = gtk_text_attr_appearance_new (&style->appearance);
  
      attr->start_index = start;
      attr->end_index = start + byte_count;

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      pango_attr_list_insert (attrs, attr); 
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    }
}

static void
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add_pixbuf_attrs (GtkTextLayout      *layout,
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		  GtkTextLineDisplay *display,
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		  GtkTextAttributes *style,
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		  GtkTextLineSegment *seg,
		  PangoAttrList      *attrs,
		  gint                start)
{
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  PangoAttribute *attr;
  PangoRectangle logical_rect;
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  GtkTextPixbuf *pixbuf = &seg->body.pixbuf;
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  gint width, height;

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  width = gdk_pixbuf_get_width (pixbuf->pixbuf);
  height = gdk_pixbuf_get_height (pixbuf->pixbuf);

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  logical_rect.x = 0;
  logical_rect.y = -height * PANGO_SCALE;
  logical_rect.width = width * PANGO_SCALE;
  logical_rect.height = height * PANGO_SCALE;

  attr = pango_attr_shape_new (&logical_rect, &logical_rect);
  attr->start_index = start;
  attr->end_index = start + seg->byte_count;
  pango_attr_list_insert (attrs, attr);

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  display->pixbufs = g_slist_append (display->pixbufs, pixbuf);
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}

static void
add_cursor (GtkTextLayout      *layout,
	    GtkTextLineDisplay *display,
	    GtkTextLineSegment *seg,
	    gint                start)
{
  PangoRectangle strong_pos, weak_pos;
  GtkTextCursorDisplay *cursor;

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  /* Hide insertion cursor when we have a selection or the layout
   * user has hidden the cursor.
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   */
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  if (gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer),
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                                     seg->body.mark.obj) &&
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      (!layout->cursor_visible ||
       gtk_text_buffer_get_selection_bounds (layout->buffer, NULL, NULL)))
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    return;
  
  pango_layout_get_cursor_pos (display->layout, start, &strong_pos, &weak_pos);
  
  cursor = g_new (GtkTextCursorDisplay, 1);
  
  cursor->x = strong_pos.x / PANGO_SCALE;
  cursor->y = strong_pos.y / PANGO_SCALE;
  cursor->height = strong_pos.height / PANGO_SCALE;
  cursor->is_strong = TRUE;
  display->cursors = g_slist_prepend (display->cursors, cursor);
  
  if (weak_pos.x == strong_pos.x)
    cursor->is_weak = TRUE;
  else
    {
      cursor->is_weak = FALSE;
      
      cursor = g_new (GtkTextCursorDisplay, 1);
      
      cursor->x = weak_pos.x / PANGO_SCALE;
      cursor->y = weak_pos.y / PANGO_SCALE;
      cursor->height = weak_pos.height / PANGO_SCALE;
      cursor->is_strong = FALSE;
      cursor->is_weak = TRUE;
      display->cursors = g_slist_prepend (display->cursors, cursor);
    }
}

GtkTextLineDisplay *
gtk_text_layout_get_line_display (GtkTextLayout *layout,
				  GtkTextLine   *line,
				  gboolean       size_only)
{
  GtkTextLineDisplay *display;
  GtkTextLineSegment *seg;
  GtkTextIter iter;
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  GtkTextAttributes *style;
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  gchar *text;
  PangoAttrList *attrs;
  gint byte_count, byte_offset;
  gdouble align;
  PangoRectangle extents;
  gboolean para_values_set = FALSE;
  GSList *cursor_byte_offsets = NULL;
  GSList *cursor_segs = NULL;
  GSList *tmp_list1, *tmp_list2;

  g_return_val_if_fail (line != NULL, NULL);

  if (layout->one_display_cache)
    {
      if (line == layout->one_display_cache->line &&
	  (size_only || !layout->one_display_cache->size_only))
	return layout->one_display_cache;
      else
	{
	  GtkTextLineDisplay *tmp_display = layout->one_display_cache;
	  layout->one_display_cache = NULL;
	  gtk_text_layout_free_line_display (layout, tmp_display);
	}
    }
  
  display = g_new0 (GtkTextLineDisplay, 1);

  display->size_only = size_only;
  display->line = line;

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  gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
                                   &iter, line, 0);
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  /* Special-case optimization for completely
   * invisible lines; makes it faster to deal
   * with sequences of invisible lines.
   */
  if (totally_invisible_line (layout, line, &iter))
    return display;

  /* Allocate space for flat text for buffer
   */
  byte_count = gtk_text_line_byte_count (line);
  text = g_malloc (byte_count);

  attrs = pango_attr_list_new ();

  /* Iterate over segments, creating display chunks for them. */
  byte_offset = 0;
  seg = gtk_text_iter_get_any_segment (&iter);
  while (seg != NULL)
    {
      /* Displayable segments */
      if (seg->type == &gtk_text_char_type ||
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	  seg->type == &gtk_text_pixbuf_type)
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        {
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	  gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
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					   &iter, line,
					   byte_offset);
	  style = get_style (layout, &iter);
	  
	  /* We have to delay setting the paragraph values until we
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	   * hit the first pixbuf or text segment because toggles at
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	   * the beginning of the paragraph should affect the
	   * paragraph-global values
	   */
	  if (!para_values_set)
	    {
	      set_para_values (layout, style, display, &align);
	      para_values_set = TRUE;
	    }

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          /* First see if the chunk is invisible, and ignore it if so. Tk
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	   * looked at tabs, wrap mode, etc. before doing this, but
	   * that made no sense to me, so I am just skipping the
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	   * invisible chunks
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	   */
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          if (!style->invisible)
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            {
	      if (seg->type == &gtk_text_char_type)
		{
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		  /* We don't want to split segments because of marks,
		   * so we scan forward for more segments only
		   * separated from us by marks. In theory, we should
		   * also merge segments with identical styles, even
		   * if there are toggles in-between
                   */
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		  gint byte_count = 0;

		  while (TRUE)
		    {
		      if (seg->type == &gtk_text_char_type)
			{
			  memcpy (text + byte_offset, seg->body.chars, seg->byte_count);
			  byte_offset += seg->byte_count;
			  byte_count += seg->byte_count;
			}
		      else if (seg->body.mark.visible)
			{
			  cursor_byte_offsets = g_slist_prepend (cursor_byte_offsets, GINT_TO_POINTER (byte_offset));
			  cursor_segs = g_slist_prepend (cursor_segs, seg);
			}

		      if (!seg->next ||
			  (seg->next->type != &gtk_text_right_mark_type &&
			   seg->next->type != &gtk_text_left_mark_type &&
			   seg->next->type != &gtk_text_char_type))
			break;

		      seg = seg->next;
		    }
		  
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		  add_text_attrs (layout, style, byte_count, attrs,
                                  byte_offset - byte_count, size_only);
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		}
	      else
		{
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		  add_pixbuf_attrs (layout, display, style,
                                    seg, attrs, byte_offset);
		  memcpy (text + byte_offset, gtk_text_unknown_char_utf8,
                          seg->byte_count);
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		  byte_offset += seg->byte_count;
		}
	    }

	  release_style (layout, style);
        }

      /* Toggles */
      else if (seg->type == &gtk_text_toggle_on_type ||
               seg->type == &gtk_text_toggle_off_type)
        {
          /* Style may have changed, drop our
             current cached style */
          invalidate_cached_style (layout);
        }
      
      /* Marks */
      else if (seg->type == &gtk_text_right_mark_type ||
               seg->type == &gtk_text_left_mark_type)
        {
          /* Display visible marks */

          if (seg->body.mark.visible)
	    {
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	      cursor_byte_offsets = g_slist_prepend (cursor_byte_offsets,
                                                     GINT_TO_POINTER (byte_offset));
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	      cursor_segs = g_slist_prepend (cursor_segs, seg);
	    }
        }

      else
        g_error ("Unknown segment type: %s", seg->type->name);

      seg = seg->next;
    }

  if (!para_values_set)
    {
      style = get_style (layout, &iter);
      set_para_values (layout, style, display, &align);
      release_style (layout, style);
    }
	      
  /* Pango doesn't want the trailing new line */
  if (byte_offset > 0 && text[byte_offset - 1] == '\n')
    byte_offset--;
  
  pango_layout_set_text (display->layout, text, byte_offset);
  pango_layout_set_attributes (display->layout, attrs);

  tmp_list1 = cursor_byte_offsets;
  tmp_list2 = cursor_segs;
  while (tmp_list1)
    {
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      add_cursor (layout, display, tmp_list2->data,
                  GPOINTER_TO_INT (tmp_list1->data));
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      tmp_list1 = tmp_list1->next;
      tmp_list2 = tmp_list2->next;
    }
  g_slist_free (cursor_byte_offsets);
  g_slist_free (cursor_segs);

  pango_layout_get_extents (display->layout, NULL, &extents);

  if (display->total_width >= 0)
    display->x_offset += (display->total_width - extents.width / PANGO_SCALE) * align;

  display->width = extents.width / PANGO_SCALE + display->left_margin + display->right_margin;
  display->height += extents.height / PANGO_SCALE;
 
  /* Free this if we aren't in a loop */
  if (layout->wrap_loop_count == 0)
    invalidate_cached_style (layout);

  g_free (text);
  pango_attr_list_unref (attrs);

  layout->one_display_cache = display;
  
  return display;
}

void
gtk_text_layout_free_line_display (GtkTextLayout      *layout,
				   GtkTextLineDisplay *display)
{
  if (display != layout->one_display_cache)
    {
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      g_object_unref (G_OBJECT (display->layout));
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      if (display->cursors)
	{
	  g_slist_foreach (display->cursors, (GFunc)g_free, NULL);
	  g_slist_free (display->cursors);
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	  g_slist_free (display->pixbufs);
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	}
      
      g_free (display);
    }
}

/* FIXME: This really doesn't belong in this file ... */
static GtkTextLineData*
gtk_text_line_data_new (GtkTextLayout *layout,
			GtkTextLine   *line)
{
  GtkTextLineData *line_data;

  line_data = g_new (GtkTextLineData, 1);

  line_data->view_id = layout;
  line_data->next = NULL;
  line_data->width = 0;
  line_data->height = 0;
  line_data->valid = FALSE;
  
  return line_data;
}

static void
get_line_at_y (GtkTextLayout *layout,
	       gint           y,
	       GtkTextLine  **line,
	       gint          *line_top)
{
  if (y < 0)
    y = 0;
  if (y > layout->height)
    y = layout->height;
  
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  *line = gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
                                         layout, y, line_top);
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  if (*line == NULL)
    {
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      *line = gtk_text_btree_get_line (_gtk_text_buffer_get_btree (layout->buffer),
				       gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1, NULL);
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      if (line_top)
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	*line_top =
          gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
                                        *line, layout);      
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    }
}

/**
 * gtk_text_layout_get_line_at_y:
 * @layout: a #GtkLayout
 * @target_iter: the iterator in which the result is stored
 * @y: the y positition
 * @line_top: location to store the y coordinate of the
 *            top of the line. (Can by %NULL.)
 * 
 * Get the iter at the beginning of the line which is displayed
 * at the given y.
 **/
void
gtk_text_layout_get_line_at_y (GtkTextLayout *layout,
			       GtkTextIter   *target_iter,
			       gint           y,
			       gint          *line_top)
{
  GtkTextLine *line;

  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (target_iter != NULL);

  get_line_at_y (layout, y, &line, line_top);
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  gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
                                   target_iter, line, 0);
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}

void
gtk_text_layout_get_iter_at_pixel (GtkTextLayout *layout,
                                   GtkTextIter *target_iter,
                                   gint x, gint y)
{
  GtkTextLine *line;
  gint byte_index, trailing;
  gint line_top;
  GtkTextLineDisplay *display;
  
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (target_iter != NULL);
  
  /* Adjust pixels to be on-screen. This gives nice
     behavior if the user is dragging with a pointer grab.
  */
  if (x < 0)
    x = 0;
  if (x > layout->width)
    x = layout->width;

  get_line_at_y (layout, y, &line, &line_top);

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  display = gtk_text_layout_get_line_display (layout, line, FALSE);
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  x -= display->x_offset;
  y -= line_top + display->top_margin;

  /* We clamp y to the area of the actual layout so that the layouts
   * hit testing works OK on the space above and below the layout
   */
  y = CLAMP (y, display->top_margin, display->height - display->top_margin - display->bottom_margin - 1);
  
  if (!pango_layout_xy_to_index (display->layout, x * PANGO_SCALE, y * PANGO_SCALE,
				 &byte_index, &trailing))
    {
      byte_index = gtk_text_line_byte_count (line);
      trailing = 0;
    }

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                                   target_iter,
                                   line, byte_index);

  while (trailing--)
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    gtk_text_iter_next_char (target_iter);
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  gtk_text_layout_free_line_display (layout, display);
}

/**
 * gtk_text_layout_get_cursor_locations
 * @layout: a #GtkTextLayout
 * @iter: a #GtkTextIter
 * @strong_pos: location to store the strong cursor position (may be %NULL)
 * @weak_pos: location to store the weak cursor position (may be %NULL)
 * 
 * Given an iterator within a text laout, determine the positions that of the
 * strong and weak cursors if the insertion point is at that
 * iterator. The position of each cursor is stored as a zero-width
 * rectangle. The strong cursor location is the location where
 * characters of the directionality equal to the base direction of the
 * paragraph are inserted.  The weak cursor location is the location
 * where characters of the directionality opposite to the base
 * direction of the paragraph are inserted.
 **/
void
gtk_text_layout_get_cursor_locations (GtkTextLayout  *layout,
				      GtkTextIter    *iter,
				      GdkRectangle   *strong_pos,
				      GdkRectangle   *weak_pos)
{
  GtkTextLine *line;
  GtkTextLineDisplay *display;
  gint line_top;

  PangoRectangle pango_strong_pos;
  PangoRectangle pango_weak_pos;

  g_return_if_fail (layout != NULL);
  g_return_if_fail (iter != NULL);
  
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  line = gtk_text_iter_get_text_line (iter);
  line_top = gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
                                           line, layout);
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  display = gtk_text_layout_get_line_display (layout, line, FALSE);
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  pango_layout_get_cursor_pos (display->layout, gtk_text_iter_get_line_index (iter),
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			       strong_pos ? &pango_strong_pos : NULL,
			       weak_pos ? &pango_weak_pos : NULL);

  if (strong_pos)
    {
      strong_pos->x = display->x_offset + pango_strong_pos.x / PANGO_SCALE;
      strong_pos->y = line_top + display->top_margin + pango_strong_pos.y / PANGO_SCALE;
      strong_pos->width = 0;
      strong_pos->height = pango_strong_pos.height / PANGO_SCALE;
    }

  if (weak_pos)
    {
      weak_pos->x = display->x_offset + pango_weak_pos.x / PANGO_SCALE;
      weak_pos->y = line_top + display->top_margin + pango_weak_pos.y / PANGO_SCALE;
      weak_pos->width = 0;
      weak_pos->height = pango_weak_pos.height / PANGO_SCALE;
    }

  gtk_text_layout_free_line_display (layout, display);
}

/**
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 * gtk_text_layout_get_line_yrange:
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 * @layout: a #GtkTextLayout
 * @iter:   a #GtkTextIter
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 * @y:      location to store the top of the paragraph in pixels,
 *          or %NULL.
 * @height  location to store the height of the paragraph in pixels,
 *          or %NULL.
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 * 
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 * the given iter.
 **/
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void
gtk_text_layout_get_line_yrange (GtkTextLayout     *layout,
				 const GtkTextIter *iter,
				 gint              *y,
				 gint              *height)
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{
  GtkTextLine *line;
  
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  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (gtk_text_iter_get_btree (iter) == _gtk_text_buffer_get_btree (layout->buffer));
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  line = gtk_text_iter_get_text_line (iter);
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  if (y)
    *y = gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
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                                       line, layout);
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  if (height)
    {
      GtkTextLineData *line_data = gtk_text_line_get_data (line, layout);
      if (line_data)
	*height = line_data->height;
      else
	*height = 0;
    }
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}

void
gtk_text_layout_get_iter_location (GtkTextLayout     *layout,
                                   const GtkTextIter *iter,
                                   GdkRectangle      *rect)
{
  PangoRectangle pango_rect;
  GtkTextLine *line;
  GtkTextBTree *tree;
  GtkTextLineDisplay *display;
  gint byte_index;
  
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
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  g_return_if_fail (gtk_text_iter_get_btree (iter) == _gtk_text_buffer_get_btree (layout->buffer));
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  g_return_if_fail (rect != NULL);
  
  tree = gtk_text_iter_get_btree (iter);
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  line = gtk_text_iter_get_text_line (iter);
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  display = gtk_text_layout_get_line_display (layout, line, FALSE);
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  rect->y = gtk_text_btree_find_line_top (tree, line, layout);

  /* pango_layout_index_to_pos() expects the index of a character within the layout,
   * so we have to special case the last character. FIXME: This should be moved
   * to Pango.
   */
  if (gtk_text_iter_ends_line (iter))
    {
      PangoLayoutLine *last_line = g_slist_last (pango_layout_get_lines (display->layout))->data;

      pango_layout_line_get_extents (last_line, NULL, &pango_rect);
      
      rect->x = display->x_offset + (pango_rect.x + pango_rect.width) / PANGO_SCALE;
      rect->y += display->top_margin;
      rect->width = 0;
      rect->height = pango_rect.height / PANGO_SCALE;
    }
  else
    {
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      byte_index = gtk_text_iter_get_line_index (iter);

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      pango_layout_index_to_pos (display->layout, byte_index, &pango_rect);
      
      rect->x = display->x_offset + pango_rect.x / PANGO_SCALE;
      rect->y += display->top_margin;
      rect->width = pango_rect.width / PANGO_SCALE;
      rect->height = pango_rect.height / PANGO_SCALE;
    }
  
  gtk_text_layout_free_line_display (layout, display);
}

/* Find the iter for the logical beginning of the first display line whose
 * top y is >= y. If none exists, move the iter to the logical beginning
 * of the last line in the buffer.
 */
static void
find_display_line_below (GtkTextLayout *layout,
			 GtkTextIter   *iter,
			 gint           y)
{
  GtkTextLine *line, *next;
  GtkTextLine *found_line = NULL;
  gint line_top;
  gint found_byte = 0;
  
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  line = gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer),
                                        layout, y, &line_top);
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  if (!line)
    {
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      line =
        gtk_text_btree_get_line (_gtk_text_buffer_get_btree (layout->buffer),
                                 gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1,
                                 NULL);
      line_top =
        gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer),
                                      line, layout);
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    }

  while (line && !found_line)
    {
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      GtkTextLineDisplay *display = gtk_text_layout_get_line_display (layout, line, FALSE);
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      gint byte_index = 0;
      GSList *tmp_list =  pango_layout_get_lines (display->layout);

      line_top += display->top_margin;
      
      while (tmp_list)
	{
	  PangoRectangle logical_rect;
	  PangoLayoutLine *layout_line = tmp_list->data;

	  found_byte = byte_index;
	  
	  if (line_top >= y)
	    {
	      found_line = line;
	      break;
	    }
	  
	  pango_layout_line_get_extents (layout_line, NULL, &logical_rect);
	  line_top += logical_rect.height / PANGO_SCALE;
	  
	  tmp_list = tmp_list->next;
	}

      line_top += display->bottom_margin;
      gtk_text_layout_free_line_display (layout, display);

      next = gtk_text_line_next (line);
      if (!next)
	found_line = line;

      line = next;
    }
  
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  gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
                                   iter, found_line, found_byte);
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}
  
/* Find the iter for the logical beginning of the last display line whose
 * top y is >= y. If none exists, move the iter to the logical beginning
 * of the first line in the buffer.
 */
static void
find_display_line_above (GtkTextLayout *layout,
			 GtkTextIter   *iter,
			 gint           y)
{
  GtkTextLine *line;
  GtkTextLine *found_line = NULL;
  gint line_top;
  gint found_byte = 0;
  
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  line = gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer), layout, y, &line_top);
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  if (!line)
    {
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      line = gtk_text_btree_get_line (_gtk_text_buffer_get_btree (layout->buffer),
				      gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1, NULL);
      line_top = gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer), line, layout);
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    }

  while (line && !found_line)
    {
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      GtkTextLineDisplay *display = gtk_text_layout_get_line_display (layout, line, FALSE);
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      PangoRectangle logical_rect;
      
      gint byte_index = 0;
      GSList *tmp_list;
      gint tmp_top;

      line_top -= display->top_margin + display->bottom_margin;
      pango_layout_get_extents (display->layout, NULL, &logical_rect);
      line_top -= logical_rect.height / PANGO_SCALE;
	  
      tmp_top = line_top + display->top_margin;

      tmp_list =  pango_layout_get_lines (display->layout);
      while (tmp_list)
	{
	  PangoLayoutLine *layout_line = tmp_list->data;

	  found_byte = byte_index;
	  
	  tmp_top += logical_rect.height / PANGO_SCALE;

	  if (tmp_top < y)
	    {
	      found_line = line;
	      found_byte = byte_index;
	    }
	  
	  pango_layout_line_get_extents (layout_line, NULL, &logical_rect);
	  
	  tmp_list = tmp_list->next;
	}

      gtk_text_layout_free_line_display (layout, display);
      
      line = gtk_text_line_previous (line);
    }

  if (found_line)
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    gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
                                     iter, found_line, found_byte);
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  else
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    gtk_text_buffer_get_iter_at_offset (layout->buffer, iter, 0);
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}
  
/**
 * gtk_text_layout_clamp_iter_to_vrange:
 * @layout: a #GtkTextLayout
 * @iter:   a #GtkTextIter
 * @top:    the top of the range
 * @bottom: the bottom the range
 * 
 * If the iterator is not fully in the range @top <= y < @bottom,
 * then, if possible, move it the minimum distance so that the
 * iterator in this range.
 *
 * Returns: %TRUE if the iterator was moved, otherwise %FALSE.
 **/
gboolean
gtk_text_layout_clamp_iter_to_vrange (GtkTextLayout *layout,
				      GtkTextIter   *iter,
				      gint           top,
				      gint           bottom)
{
  GdkRectangle iter_rect;

  gtk_text_layout_get_iter_location (layout, iter, &iter_rect);

  /* If the iter is at least partially above the range, put the iter
   * at the first fully visible line after the range.
   */
  if (iter_rect.y < top)
    {
      find_display_line_below (layout, iter, top);
      
      return TRUE;
    }
  /* Otherwise, if the iter is at least partially below the screen, put the
   * iter on the last logical position of the last completely visible
   * line on screen
   */
  else if (iter_rect.y + iter_rect.height > bottom)
    {
      find_display_line_above (layout, iter, bottom);
      
      return TRUE;
    }
  else
    return FALSE;
}

/**
 * gtk_text_layout_move_iter_to_next_line:
 * @layout: a #GtkLayout
 * @iter:   a #GtkTextIter
 * 
 * Move the iterator to the beginning of the previous line. The lines
 * of a wrapped paragraph are treated as distinct for this operation.
 **/
void
gtk_text_layout_move_iter_to_previous_line (GtkTextLayout *layout,
					    GtkTextIter   *iter)
{
  GtkTextLine *line;
  GtkTextLineDisplay *display;
  gint line_byte;
  GSList *tmp_list;
  PangoLayoutLine *layout_line;

  g_return_if_fail (layout != NULL);
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (iter != NULL);
  
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  line = gtk_text_iter_get_text_line (iter);
  line_byte = gtk_text_iter_get_line_index (iter);
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  display = gtk_text_layout_get_line_display (layout, line, FALSE);
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  tmp_list = pango_layout_get_lines (display->layout);
  layout_line = tmp_list->data;

  if (line_byte < layout_line->length || !tmp_list->next) /* first line of paragraph */
    {
      GtkTextLine *prev_line = gtk_text_line_previous (line);

      if (prev_line)
	{
	  gint byte_offset = 0;
	  
	  gtk_text_layout_free_line_display (layout, display);
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	  display = gtk_text_layout_get_line_display (layout, prev_line, FALSE);
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	  tmp_list =  pango_layout_get_lines (display->layout);

	  while (tmp_list->next)
	    {
	      layout_line = tmp_list->data;
	      tmp_list = tmp_list->next;

	      byte_offset += layout_line->length;
	    }

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	  gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
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					   iter, prev_line, byte_offset);
	}
      else
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	gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
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					 iter, line, 0);
    }
  else
    {
      gint prev_offset = 0;
      gint byte_offset = layout_line->length;

      tmp_list = tmp_list->next;
      while (tmp_list)
	{
	  layout_line = tmp_list->data;

	  if (line_byte < byte_offset + layout_line->length || !tmp_list->next)
	    {
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	      gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
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					       iter, line, prev_offset);
	      break;
	    }
	  
	  prev_offset = byte_offset;
	  byte_offset += layout_line->length;
	  tmp_list = tmp_list->next;
	}
    }

  gtk_text_layout_free_line_display (layout, display);
}

/**
 * gtk_text_layout_move_iter_to_next_line:
 * @layout: a #GtkLayout
 * @iter:   a #GtkTextIter
 * 
 * Move the iterator to the beginning of the next line. The
 * lines of a wrapped paragraph are treated as distinct for
 * this operation.
 **/
void
gtk_text_layout_move_iter_to_next_line (GtkTextLayout *layout,
					GtkTextIter   *iter)
{
  GtkTextLine *line;
  GtkTextLineDisplay *display;
  gint line_byte;
  
  gboolean found = FALSE;
  gboolean found_after = FALSE;
  
  g_return_if_fail (layout != NULL);
  g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
  g_return_if_fail (iter != NULL);