[gtk/wip/chergert/textview-access-to-contexts] textview: give application developers access to RTL and LTR context

[Christian Hergert <chergert src gnome org>]

commit a6101f01815123a3708926361dc6f1950e85da08
Author: Christian Hergert <chergert redhat com>
Date:   Sat Jun 19 12:20:23 2021 -0700

    textview: give application developers access to RTL and LTR context
    
    This allows developers to modify the pango context that is used when
    rendering text within the text view.
    
    Such access can be useful to alter how rounding occurs with API such as
    pango_context_set_round_glyph_positions() and is needed by GtkSourceView
    for proper placement of glyphs within the overview map.

 gtk/gtktextview.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 gtk/gtktextview.h |  4 ++++
 2 files changed, 50 insertions(+)
---
diff --git a/gtk/gtktextview.c b/gtk/gtktextview.c
index 669312faa5..5bf134302c 100644
--- a/gtk/gtktextview.c
+++ b/gtk/gtktextview.c
@@ -9963,3 +9963,49 @@ gtk_text_view_buffer_notify_undo (GtkTextBuffer *buffer,
                                  (gtk_text_view_get_editable (view) &&
                                   gtk_text_buffer_get_can_undo (buffer)));
 }
+
+/**
+ * gtk_text_view_get_ltr_context:
+ * @text_view: a `GtkTextView`
+ *
+ * Gets the `PangoContext` that is used for rendering LTR directed
+ * text layouts.
+ *
+ * The context may be replaced when CSS changes occur.
+ *
+ * Returns: (transfer none): a `PangoContext`
+ *
+ * Since: 4.4
+ */
+PangoContext *
+gtk_text_view_get_ltr_context (GtkTextView *text_view)
+{
+  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);
+
+  gtk_text_view_ensure_layout (text_view);
+
+  return text_view->priv->layout->ltr_context;
+}
+
+/**
+ * gtk_text_view_get_rtl_context:
+ * @text_view: a `GtkTextView`
+ *
+ * Gets the `PangoContext` that is used for rendering RTL directed
+ * text layouts.
+ *
+ * The context may be replaced when CSS changes occur.
+ *
+ * Returns: (transfer none): a `PangoContext`
+ *
+ * Since: 4.4
+ */
+PangoContext *
+gtk_text_view_get_rtl_context (GtkTextView *text_view)
+{
+  g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);
+
+  gtk_text_view_ensure_layout (text_view);
+
+  return text_view->priv->layout->rtl_context;
+}
diff --git a/gtk/gtktextview.h b/gtk/gtktextview.h
index 2b412e6500..325077a871 100644
--- a/gtk/gtktextview.h
+++ b/gtk/gtktextview.h
@@ -427,6 +427,10 @@ void             gtk_text_view_set_extra_menu         (GtkTextView      *text_vi
                                                        GMenuModel       *model);
 GDK_AVAILABLE_IN_ALL
 GMenuModel *     gtk_text_view_get_extra_menu         (GtkTextView      *text_view);
+GDK_AVAILABLE_IN_ALL
+PangoContext    *gtk_text_view_get_rtl_context        (GtkTextView      *text_view);
+GDK_AVAILABLE_IN_ALL
+PangoContext    *gtk_text_view_get_ltr_context        (GtkTextView      *text_view);
 
 G_END_DECLS