[libgxps] Implement Quadratic BÃzier curve

[Carlos Garcia Campos <carlosgc src gnome org>]

commit e2fee33fe68deffe5592824a4c1c33b195347caf
Author: Carlos Garcia Campos <carlosgc gnome org>
Date:   Sun Nov 6 17:00:10 2011 +0100

    Implement Quadratic BÃzier curve

 TODO                |    1 -
 libgxps/gxps-page.c |   14 +++++++++++++-
 2 files changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/TODO b/TODO
index 8ce338c..0b59275 100644
--- a/TODO
+++ b/TODO
@@ -32,7 +32,6 @@ Rendering
    + Opacity
    + Opacity Masks
 - Visual Brush
-- Quadratic BÃzier curve
 - Smooth Cubic BÃzier curve
 - Elliptical Arc
 - Radial gradients when center != origin
diff --git a/libgxps/gxps-page.c b/libgxps/gxps-page.c
index a9ea683..9acc579 100644
--- a/libgxps/gxps-page.c
+++ b/libgxps/gxps-page.c
@@ -704,6 +704,7 @@ path_data_parse (const gchar *data,
 		case 'Q':
 			while (token.type == PD_TOKEN_NUMBER) {
 				gdouble x1, y1, x2, y2;
+                                gdouble x, y;
 
 				if (!path_data_get_point (&token, &x1, &y1, error))
 					return FALSE;
@@ -715,7 +716,18 @@ path_data_parse (const gchar *data,
 
 				GXPS_DEBUG (g_message ("%s (%f, %f, %f, %f)", is_rel ? "rel_quad_curve_to" : "quad_curve_to",
 					      x1, y1, x2, y2));
-				GXPS_DEBUG (g_debug ("Unsupported command in path: %c", command));
+
+                                cairo_get_current_point (cr, &x, &y);
+                                x1 += is_rel ? x : 0;
+                                y1 += is_rel ? y : 0;
+                                x2 += is_rel ? x : 0;
+                                y2 += is_rel ? y : 0;
+                                cairo_curve_to (cr,
+                                                2.0 / 3.0 * x1 + 1.0 / 3.0 * x,
+                                                2.0 / 3.0 * y1 + 1.0 / 3.0 * y,
+                                                2.0 / 3.0 * x1 + 1.0 / 3.0 * x2,
+                                                2.0 / 3.0 * y1 + 1.0 / 3.0 * y2,
+                                                x2, y2);
 
 				if (!path_data_iter_next (&token, error))
                                         return FALSE;