Add dashed and dotted lineslines

Extend the PangoUnderline and PangoOverline enumerations to
cover dashed and dotted variants of the various lines, add
api to PangoRenderer to render such lines, and implement it
in the cairo renderer.

1 files changed, 34 insertions, 2 deletions

diff --git a/pango/pango-attributes.h b/pango/pango-attributes.h
index e20b6413..fdc1e86a 100644
--- a/pango/pango-attributes.h
+++ b/pango/pango-attributes.h
@@ -228,6 +228,22 @@ typedef enum
  * @PANGO_UNDERLINE_ERROR_LINE: Like @PANGO_UNDERLINE_ERROR, but
  *     drawn continuously across multiple runs. This type
  *     of underlining is available since Pango 1.46.
+ * @PANGO_UNDERLINE_SINGLE_DOTTED: a single, dotted underline. Since Pango 1.50.
+ * @PANGO_UNDERLINE_DOUBLE_DOTTED: a double, dotted underline. Since Pango 1.50.
+ * @PANGO_UNDERLINE_LOW_DOTTED: a single, dotted underline in the same
+ *     position as for @PANGO_UNDERLINE_LOW. Since Pango 1.50.
+ * @PANGO_UNDERLINE_SINGLE_LINE_DOTTED: a single, dotted underline, drawn
+ *     continuously across multiple runs. Since Pango 1.50.
+ * @PANGO_UNDERLINE_DOUBLE_LINE_DOTTED: a double, dotted underline, drawn
+ *     continuously across multiple runs. Since Pango 1.50.
+ * @PANGO_UNDERLINE_SINGLE_DASHED: a single, dashed underline. Since Pango 1.50.
+ * @PANGO_UNDERLINE_DOUBLE_DASHED: a double, dashed underline. Since Pango 1.50.
+ * @PANGO_UNDERLINE_LOW_DASHED: a single, dashed underline in the same
+ *     position as for @PANGO_UNDERLINE_LOW. Since Pango 1.50.
+ * @PANGO_UNDERLINE_SINGLE_LINE_DASHED: a single, dashed underline, drawn
+ *     continuously across multiple runs. Since Pango 1.50.
+ * @PANGO_UNDERLINE_DOUBLE_LINE_DASHED: a double, dashed underline, drawn
+ *     continuously across multiple runs. Since Pango 1.50.
  *
  * The `PangoUnderline` enumeration is used to specify whether text
  * should be underlined, and if so, the type of underlining.
@@ -240,7 +256,19 @@ typedef enum {
   PANGO_UNDERLINE_ERROR,
   PANGO_UNDERLINE_SINGLE_LINE,
   PANGO_UNDERLINE_DOUBLE_LINE,
-  PANGO_UNDERLINE_ERROR_LINE
+  PANGO_UNDERLINE_ERROR_LINE,
+
+  PANGO_UNDERLINE_SINGLE_DOTTED,
+  PANGO_UNDERLINE_DOUBLE_DOTTED,
+  PANGO_UNDERLINE_LOW_DOTTED,
+  PANGO_UNDERLINE_SINGLE_LINE_DOTTED,
+  PANGO_UNDERLINE_DOUBLE_LINE_DOTTED,
+
+  PANGO_UNDERLINE_SINGLE_DASHED,
+  PANGO_UNDERLINE_DOUBLE_DASHED,
+  PANGO_UNDERLINE_LOW_DASHED,
+  PANGO_UNDERLINE_SINGLE_LINE_DASHED,
+  PANGO_UNDERLINE_DOUBLE_LINE_DASHED,
 } PangoUnderline;
 
 
@@ -249,6 +277,8 @@ typedef enum {
  * @PANGO_OVERLINE_NONE: no overline should be drawn
  * @PANGO_OVERLINE_SINGLE: Draw a single line above the ink
  *     extents of the text being underlined.
+ * @PANGO_OVERLINE_SINGLE_DOTTED: A single, dotted line. Since Pango 1.50
+ * @PANGO_OVERLINE_SINGLE_DASHED: A single, dashed line. Since Pango 1.50
  *
  * The `PangoOverline` enumeration is used to specify whether text
  * should be overlined, and if so, the type of line.
@@ -257,7 +287,9 @@ typedef enum {
  */
 typedef enum {
   PANGO_OVERLINE_NONE,
-  PANGO_OVERLINE_SINGLE
+  PANGO_OVERLINE_SINGLE,
+  PANGO_OVERLINE_SINGLE_DOTTED,
+  PANGO_OVERLINE_SINGLE_DASHED
 } PangoOverline;
 
 /**