[empathy] Add a rectangle actor with rounded corners

[Emilio Pozuelo Monfort <epm src gnome org>]

commit c1eb12ebde6572a01744a8120440e630c8920d3a
Author: Emilio Pozuelo Monfort <emilio pozuelo collabora co uk>
Date:   Wed Aug 17 13:20:29 2011 +0100

    Add a rectangle actor with rounded corners
    
    This is a ClutterCairoTexture subclass and uses Cairo for
    drawing as Cairo is antialiased while Cogl is not.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=656576

 src/Makefile.am                 |    2 +
 src/empathy-rounded-rectangle.c |  133 +++++++++++++++++++++++++++++++++++++++
 src/empathy-rounded-rectangle.h |   75 ++++++++++++++++++++++
 3 files changed, 210 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index d77f75f..91c9988 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -179,6 +179,8 @@ empathy_call_SOURCES = \
        empathy-mic-menu.h \
        empathy-rounded-actor.c \
        empathy-rounded-actor.h \
+       empathy-rounded-rectangle.c \
+       empathy-rounded-rectangle.h \
        empathy-rounded-texture.c \
        empathy-rounded-texture.h \
        empathy-mic-monitor.c \
diff --git a/src/empathy-rounded-rectangle.c b/src/empathy-rounded-rectangle.c
new file mode 100644
index 0000000..e06889d
--- /dev/null
+++ b/src/empathy-rounded-rectangle.c
@@ -0,0 +1,133 @@
+/*
+ * empathy-rounded-rectangle.c - Source for EmpathyRoundedRectangle
+ * Copyright (C) 2011 Collabora Ltd.
+ * @author Emilio Pozuelo Monfort <emilio pozuelo collabora co uk>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <math.h>
+
+#include <clutter/clutter.h>
+
+#include "empathy-rounded-rectangle.h"
+
+G_DEFINE_TYPE (EmpathyRoundedRectangle,
+    empathy_rounded_rectangle,
+    CLUTTER_TYPE_CAIRO_TEXTURE)
+
+struct _EmpathyRoundedRectanglePriv
+{
+  ClutterColor border_color;
+  guint border_width;
+};
+
+static void
+empathy_rounded_rectangle_paint (EmpathyRoundedRectangle *self)
+{
+  guint width, height;
+  guint tmp_alpha;
+  cairo_t *cr;
+
+#define RADIUS (height / 8.)
+
+  clutter_cairo_texture_get_surface_size (CLUTTER_CAIRO_TEXTURE (self),
+      &width, &height);
+
+  /* compute the composited opacity of the actor taking into
+   * account the opacity of the color set by the user */
+  tmp_alpha = clutter_actor_get_paint_opacity (CLUTTER_ACTOR (self))
+            * self->priv->border_color.alpha
+            / 255;
+
+  cr = clutter_cairo_texture_create (CLUTTER_CAIRO_TEXTURE (self));
+
+  cairo_set_source_rgba (cr,
+      self->priv->border_color.red,
+      self->priv->border_color.green,
+      self->priv->border_color.blue,
+      tmp_alpha);
+
+  cairo_set_line_width (cr, self->priv->border_width);
+
+  cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
+  cairo_paint (cr);
+  cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
+
+  cairo_new_sub_path (cr);
+  cairo_arc (cr, width - RADIUS, RADIUS, RADIUS,
+      -M_PI/2.0, 0);
+  cairo_arc (cr, width - RADIUS, height - RADIUS, RADIUS,
+      0, M_PI/2.0);
+  cairo_arc (cr, RADIUS, height - RADIUS, RADIUS,
+      M_PI/2.0, M_PI);
+  cairo_arc (cr, RADIUS, RADIUS, RADIUS,
+      M_PI, -M_PI/2.0);
+  cairo_close_path (cr);
+
+  cairo_stroke (cr);
+  cairo_destroy (cr);
+
+#undef RADIUS
+}
+
+static void
+empathy_rounded_rectangle_init (EmpathyRoundedRectangle *self)
+{
+  self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
+      EMPATHY_TYPE_ROUNDED_RECTANGLE, EmpathyRoundedRectanglePriv);
+
+  self->priv->border_width = 1;
+}
+
+static void
+empathy_rounded_rectangle_class_init (EmpathyRoundedRectangleClass *klass)
+{
+  g_type_class_add_private (klass, sizeof (EmpathyRoundedRectanglePriv));
+}
+
+ClutterActor *
+empathy_rounded_rectangle_new (guint width,
+    guint height)
+{
+  ClutterActor *self;
+
+  self = CLUTTER_ACTOR (g_object_new (EMPATHY_TYPE_ROUNDED_RECTANGLE, NULL));
+
+  clutter_cairo_texture_set_surface_size (CLUTTER_CAIRO_TEXTURE (self),
+      width, height);
+
+  empathy_rounded_rectangle_paint (EMPATHY_ROUNDED_RECTANGLE (self));
+
+  return self;
+}
+
+void
+empathy_rounded_rectangle_set_border_width (EmpathyRoundedRectangle *self,
+    guint border_width)
+{
+  self->priv->border_width = border_width;
+
+  empathy_rounded_rectangle_paint (self);
+}
+
+void
+empathy_rounded_rectangle_set_border_color (EmpathyRoundedRectangle *self,
+    const ClutterColor *color)
+{
+  self->priv->border_color = *color;
+
+  empathy_rounded_rectangle_paint (self);
+}
diff --git a/src/empathy-rounded-rectangle.h b/src/empathy-rounded-rectangle.h
new file mode 100644
index 0000000..38d396f
--- /dev/null
+++ b/src/empathy-rounded-rectangle.h
@@ -0,0 +1,75 @@
+/*
+ * empathy-rounded-rectangle.h - Header for EmpathyRoundedRectangle
+ * Copyright (C) 2011 Collabora Ltd.
+ * @author Emilio Pozuelo Monfort <emilio pozuelo collabora co uk>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef __EMPATHY_ROUNDED_RECTANGLE_H__
+#define __EMPATHY_ROUNDED_RECTANGLE_H__
+
+#include <glib-object.h>
+#include <clutter/clutter.h>
+
+G_BEGIN_DECLS
+
+typedef struct _EmpathyRoundedRectangle EmpathyRoundedRectangle;
+typedef struct _EmpathyRoundedRectanglePriv EmpathyRoundedRectanglePriv;
+typedef struct _EmpathyRoundedRectangleClass EmpathyRoundedRectangleClass;
+
+struct _EmpathyRoundedRectangleClass {
+    ClutterCairoTextureClass parent_class;
+};
+
+struct _EmpathyRoundedRectangle {
+    ClutterCairoTexture parent;
+
+    EmpathyRoundedRectanglePriv *priv;
+};
+
+GType empathy_rounded_rectangle_get_type (void);
+
+/* TYPE MACROS */
+#define EMPATHY_TYPE_ROUNDED_RECTANGLE \
+  (empathy_rounded_rectangle_get_type ())
+#define EMPATHY_ROUNDED_RECTANGLE(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj), EMPATHY_TYPE_ROUNDED_RECTANGLE, \
+    EmpathyRoundedRectangle))
+#define EMPATHY_ROUNDED_RECTANGLE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass), EMPATHY_TYPE_ROUNDED_RECTANGLE, \
+    EmpathyRoundedRectangleClass))
+#define EMPATHY_IS_ROUNDED_RECTANGLE(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj), EMPATHY_TYPE_ROUNDED_RECTANGLE))
+#define EMPATHY_IS_ROUNDED_RECTANGLE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass), EMPATHY_TYPE_ROUNDED_RECTANGLE))
+#define EMPATHY_ROUNDED_RECTANGLE_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), EMPATHY_TYPE_ROUNDED_RECTANGLE, \
+    EmpathyRoundedRectangleClass))
+
+ClutterActor *empathy_rounded_rectangle_new (guint width,
+    guint height);
+
+void
+empathy_rounded_rectangle_set_border_width (EmpathyRoundedRectangle *self,
+    guint border_width);
+
+void
+empathy_rounded_rectangle_set_border_color (EmpathyRoundedRectangle *self,
+    const ClutterColor *color);
+
+G_END_DECLS
+
+#endif /* #ifndef __EMPATHY_ROUNDED_RECTANGLE_H__*/