[gtk-theme-engine-clearlooks] Render sliders in GtkScales as per the mockups.

[Carlos Garnacho <carlosg src gnome org>]

commit 53b4ed6bccdd122bc71594eb3dc8c58c8e4c48b3
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jan 19 04:27:48 2011 +0100

    Render sliders in GtkScales as per the mockups.

 src/adwaita_engine.c |   82 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 82 insertions(+), 0 deletions(-)
---
diff --git a/src/adwaita_engine.c b/src/adwaita_engine.c
index c1e0154..1323457 100644
--- a/src/adwaita_engine.c
+++ b/src/adwaita_engine.c
@@ -521,6 +521,87 @@ adwaita_engine_render_activity (GtkThemingEngine *engine,
 }
 
 static void
+adwaita_engine_render_slider (GtkThemingEngine *engine,
+			      cairo_t          *cr,
+			      gdouble           x,
+			      gdouble           y,
+			      gdouble           width,
+			      gdouble           height,
+			      GtkOrientation    orientation)
+{
+	const GtkWidgetPath *path;
+
+	path = gtk_theming_engine_get_path (engine);
+	cairo_save (cr);
+
+	if (gtk_widget_path_is_type (path, GTK_TYPE_SCALE))
+	{
+		cairo_pattern_t *pattern;
+		cairo_matrix_t matrix;
+		GtkStateFlags state;
+		GdkRGBA color;
+
+		state = gtk_theming_engine_get_state (engine);
+
+		if (orientation == GTK_ORIENTATION_HORIZONTAL)
+		{
+			cairo_move_to (cr, x + width / 2, y);
+			cairo_line_to (cr, x, y + height / 2);
+			cairo_line_to (cr, x, y + height);
+			cairo_line_to (cr, x + width, y + height);
+			cairo_line_to (cr, x + width, y + height / 2);
+			cairo_line_to (cr, x + width / 2, y);
+		}
+		else if (gtk_theming_engine_get_direction (engine) == GTK_TEXT_DIR_RTL)
+		{
+			cairo_move_to (cr, x, y + height / 2);
+			cairo_line_to (cr, x + width / 2, y);
+			cairo_line_to (cr, x + width, y);
+			cairo_line_to (cr, x + width, y + height);
+			cairo_line_to (cr, x + width / 2, y + height);
+			cairo_line_to (cr, x, y + height / 2);
+		}
+		else
+		{
+			cairo_move_to (cr, x + width, y + height / 2);
+			cairo_line_to (cr, x + width / 2, y);
+			cairo_line_to (cr, x, y);
+			cairo_line_to (cr, x, y + height);
+			cairo_line_to (cr, x + width / 2, y + height);
+			cairo_line_to (cr, x + width, y + height / 2);
+		}
+		cairo_close_path (cr);
+
+		cairo_set_line_width (cr, 1);
+
+		gtk_theming_engine_get (engine, state,
+					"background-image", &pattern,
+					NULL);
+
+		cairo_matrix_init_scale (&matrix, 1 / width, 1 / height);
+		cairo_matrix_translate (&matrix, -x, -y);
+		cairo_pattern_set_matrix (pattern, &matrix);
+
+		cairo_set_source (cr, pattern);
+		cairo_fill_preserve (cr);
+
+		gtk_theming_engine_get_border_color (engine, state, &color);
+		gdk_cairo_set_source_rgba (cr, &color);
+		cairo_stroke (cr);
+
+		cairo_pattern_destroy (pattern);
+	}
+	else
+	{
+		GTK_THEMING_ENGINE_CLASS (adwaita_engine_parent_class)->render_slider (engine, cr,
+										       x, y, width, height,
+										       orientation);
+	}
+
+	cairo_restore (cr);
+}
+
+static void
 adwaita_engine_class_init (AdwaitaEngineClass *klass)
 {
 	GtkThemingEngineClass *engine_class = GTK_THEMING_ENGINE_CLASS (klass);
@@ -533,6 +614,7 @@ adwaita_engine_class_init (AdwaitaEngineClass *klass)
 	engine_class->render_frame = adwaita_engine_render_frame;
 	engine_class->render_expander = adwaita_engine_render_expander;
 	engine_class->render_activity = adwaita_engine_render_activity;
+	engine_class->render_slider = adwaita_engine_render_slider;
 
 	gtk_theming_engine_register_property (ADWAITA_NAMESPACE, NULL,
 					      g_param_spec_boxed ("focus-border-color",