This file is indexed.

/usr/share/gtk-3.0/demo/rotated_text.c is in gtk-3-examples 3.4.2-0ubuntu0.9.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
/* Rotated Text
 *
 * This demo shows how to use PangoCairo to draw rotated and transformed
 * text.  The right pane shows a rotated GtkLabel widget.
 *
 * In both cases, a custom PangoCairo shape renderer is installed to draw
 * a red heard using cairo drawing operations instead of the Unicode heart
 * character.
 */

#include <gtk/gtk.h>
#include <string.h>

static GtkWidget *window = NULL;

#define HEART "♥"
const char text[] = "I ♥ GTK+";

static void
fancy_shape_renderer (cairo_t        *cr,
                      PangoAttrShape *attr,
                      gboolean        do_path,
                      gpointer        data)
{
  double x, y;
  cairo_get_current_point (cr, &x, &y);
  cairo_translate (cr, x, y);

  cairo_scale (cr,
               (double) attr->ink_rect.width  / PANGO_SCALE,
               (double) attr->ink_rect.height / PANGO_SCALE);

  switch (GPOINTER_TO_UINT (attr->data))
    {
    case 0x2665: /* U+2665 BLACK HEART SUIT */
      {
        cairo_move_to (cr, .5, .0);
        cairo_line_to (cr, .9, -.4);
        cairo_curve_to (cr, 1.1, -.8, .5, -.9, .5, -.5);
        cairo_curve_to (cr, .5, -.9, -.1, -.8, .1, -.4);
        cairo_close_path (cr);
      }
      break;
    }

  if (!do_path) {
    cairo_set_source_rgb (cr, 1., 0., 0.);
    cairo_fill (cr);
  }
}

PangoAttrList *
create_fancy_attr_list_for_layout (PangoLayout *layout)
{
  PangoAttrList *attrs;
  PangoFontMetrics *metrics;
  int ascent;
  PangoRectangle ink_rect, logical_rect;
  const char *p;

  /* Get font metrics and prepare fancy shape size */
  metrics = pango_context_get_metrics (pango_layout_get_context (layout),
                                       pango_layout_get_font_description (layout),
                                       NULL);
  ascent = pango_font_metrics_get_ascent (metrics);
  logical_rect.x = 0;
  logical_rect.width = ascent;
  logical_rect.y = -ascent;
  logical_rect.height = ascent;
  ink_rect = logical_rect;
  pango_font_metrics_unref (metrics);

  /* Set fancy shape attributes for all hearts */
  attrs = pango_attr_list_new ();
  for (p = text; (p = strstr (p, HEART)); p += strlen (HEART))
    {
      PangoAttribute *attr;

      attr = pango_attr_shape_new_with_data (&ink_rect,
                                             &logical_rect,
                                             GUINT_TO_POINTER (g_utf8_get_char (p)),
                                             NULL, NULL);

      attr->start_index = p - text;
      attr->end_index = attr->start_index + strlen (HEART);

      pango_attr_list_insert (attrs, attr);
    }

  return attrs;
}

static gboolean
rotated_text_draw (GtkWidget *widget,
                   cairo_t   *cr,
                   gpointer   data)
{
#define RADIUS 150
#define N_WORDS 5
#define FONT "Serif 18"

  PangoContext *context;
  PangoLayout *layout;
  PangoFontDescription *desc;

  cairo_pattern_t *pattern;

  PangoAttrList *attrs;

  double device_radius;
  int width, height;
  int i;

  /* Create a cairo context and set up a transformation matrix so that the user
   * space coordinates for the centered square where we draw are [-RADIUS, RADIUS],
   * [-RADIUS, RADIUS].
   * We first center, then change the scale. */
  width = gtk_widget_get_allocated_width (widget);
  height = gtk_widget_get_allocated_height (widget);
  device_radius = MIN (width, height) / 2.;
  cairo_translate (cr,
                   device_radius + (width - 2 * device_radius) / 2,
                   device_radius + (height - 2 * device_radius) / 2);
  cairo_scale (cr, device_radius / RADIUS, device_radius / RADIUS);

  /* Create and a subtle gradient source and use it. */
  pattern = cairo_pattern_create_linear (-RADIUS, -RADIUS, RADIUS, RADIUS);
  cairo_pattern_add_color_stop_rgb (pattern, 0., .5, .0, .0);
  cairo_pattern_add_color_stop_rgb (pattern, 1., .0, .0, .5);
  cairo_set_source (cr, pattern);

  /* Create a PangoContext and set up our shape renderer */
  context = gtk_widget_create_pango_context (widget);
  pango_cairo_context_set_shape_renderer (context,
                                          fancy_shape_renderer,
                                          NULL, NULL);

  /* Create a PangoLayout, set the text, font, and attributes */
  layout = pango_layout_new (context);
  pango_layout_set_text (layout, text, -1);
  desc = pango_font_description_from_string (FONT);
  pango_layout_set_font_description (layout, desc);

  attrs = create_fancy_attr_list_for_layout (layout);
  pango_layout_set_attributes (layout, attrs);
  pango_attr_list_unref (attrs);

  /* Draw the layout N_WORDS times in a circle */
  for (i = 0; i < N_WORDS; i++)
    {
      int width, height;

      /* Inform Pango to re-layout the text with the new transformation matrix */
      pango_cairo_update_layout (cr, layout);

      pango_layout_get_pixel_size (layout, &width, &height);
      cairo_move_to (cr, - width / 2, - RADIUS * .9);
      pango_cairo_show_layout (cr, layout);

      /* Rotate for the next turn */
      cairo_rotate (cr, G_PI*2 / N_WORDS);
    }

  /* free the objects we created */
  pango_font_description_free (desc);
  g_object_unref (layout);
  g_object_unref (context);
  cairo_pattern_destroy (pattern);

  return FALSE;
}

GtkWidget *
do_rotated_text (GtkWidget *do_widget)
{
  if (!window)
    {
      GtkWidget *box;
      GtkWidget *drawing_area;
      GtkWidget *label;
      PangoLayout *layout;
      PangoAttrList *attrs;

      const GdkRGBA white = { 1.0, 1.0, 1.0, 1.0 };

      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
      gtk_window_set_screen (GTK_WINDOW (window),
                             gtk_widget_get_screen (do_widget));
      gtk_window_set_title (GTK_WINDOW (window), "Rotated Text");
      gtk_window_set_default_size (GTK_WINDOW (window), 4 * RADIUS, 2 * RADIUS);
      g_signal_connect (window, "destroy", G_CALLBACK (gtk_widget_destroyed), &window);

      box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
      gtk_box_set_homogeneous (GTK_BOX (box), TRUE);
      gtk_container_add (GTK_CONTAINER (window), box);

      /* Add a drawing area */

      drawing_area = gtk_drawing_area_new ();
      gtk_container_add (GTK_CONTAINER (box), drawing_area);

      /* This overrides the background color from the theme */
      gtk_widget_override_background_color (drawing_area, 0, &white);

      g_signal_connect (drawing_area, "draw",
                        G_CALLBACK (rotated_text_draw), NULL);

      /* And a label */

      label = gtk_label_new (text);
      gtk_container_add (GTK_CONTAINER (box), label);

      gtk_label_set_angle (GTK_LABEL (label), 45);

      /* Set up fancy stuff on the label */
      layout = gtk_label_get_layout (GTK_LABEL (label));
      pango_cairo_context_set_shape_renderer (pango_layout_get_context (layout),
                                              fancy_shape_renderer,
                                              NULL, NULL);
      attrs = create_fancy_attr_list_for_layout (layout);
      gtk_label_set_attributes (GTK_LABEL (label), attrs);
      pango_attr_list_unref (attrs);
    }

  if (!gtk_widget_get_visible (window))
    {
      gtk_widget_show_all (window);
    }
  else
    {
      gtk_widget_destroy (window);
      window = NULL;
    }

  return window;
}