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, 33 insertions, 1 deletions

diff --git a/pango/pango-renderer.h b/pango/pango-renderer.h
index 98c4cfb0..1b1e744e 100644
--- a/pango/pango-renderer.h
+++ b/pango/pango-renderer.h
@@ -60,6 +60,21 @@ typedef enum
 } PangoRenderPart;
 
 /**
+ * PangoRenderLineStyle:
+ * @PANGO_RENDER_LINE_SOLID: A solid line
+ * @PANGO_RENDER_LINE_DASHED: A dashed line
+ * @PANGO_RENDER_LINE_DOTTED: A dotted line
+ *
+ * The line style passed to the draw_line() vfunc.
+ */
+typedef enum
+{
+  PANGO_RENDER_LINE_SOLID,
+  PANGO_RENDER_LINE_DASHED,
+  PANGO_RENDER_LINE_DOTTED
+} PangoRenderLineStyle;
+
+/**
  * PangoRenderer:
  * @matrix: (nullable): the current transformation matrix for
  *    the Renderer; may be %NULL, which should be treated the
@@ -108,6 +123,7 @@ struct _PangoRenderer
  * @end: Do renderer-specific cleanup after drawing
  * @prepare_run: updates the renderer for a new run
  * @draw_glyph_item: draws a #PangoGlyphItem
+ * @draw_line: draws a line. Available since Pango 1.50
  *
  * Class structure for #PangoRenderer.
  *
@@ -186,10 +202,17 @@ struct _PangoRendererClass
                                 int               x,
                                 int               y);
 
+  void (*draw_line)            (PangoRenderer        *renderer,
+                                PangoRenderPart       part,
+                                PangoRenderLineStyle  style,
+                                int                   x,
+                                int                   y,
+                                int                   width,
+                                int                   height);
+
   /*< private >*/
 
   /* Padding for future expansion */
-  void (*_pango_reserved2) (void);
   void (*_pango_reserved3) (void);
   void (*_pango_reserved4) (void);
 };
@@ -248,6 +271,15 @@ void pango_renderer_draw_glyph           (PangoRenderer    *renderer,
                                           double            x,
                                           double            y);
 
+PANGO_AVAILABLE_IN_1_50
+void pango_renderer_draw_line            (PangoRenderer        *renderer,
+                                          PangoRenderPart       part,
+                                          PangoRenderLineStyle  style,
+                                          int                   x,
+                                          int                   y,
+                                          int                   width,
+                                          int                   height);
+
 PANGO_AVAILABLE_IN_1_8
 void pango_renderer_activate             (PangoRenderer    *renderer);
 PANGO_AVAILABLE_IN_1_8