src/empathy-rounded-rectangle.c

   1 /*
   2  * empathy-rounded-rectangle.c - Source for EmpathyRoundedRectangle
   3  * Copyright (C) 2011 Collabora Ltd.
   4  * @author Emilio Pozuelo Monfort <emilio.pozuelo@collabora.co.uk>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include "config.h"
  22 #include "empathy-rounded-rectangle.h"
  23
  24 #include <math.h>
  25
  26 G_DEFINE_TYPE (EmpathyRoundedRectangle,
  27     empathy_rounded_rectangle,
  28     CLUTTER_TYPE_CAIRO_TEXTURE)
  29
  30 struct _EmpathyRoundedRectanglePriv
  31 {
  32   guint width, height;
  33   ClutterColor border_color;
  34   guint border_width;
  35   guint round_factor;
  36 };
  37
  38 static gboolean
  39 draw_cb (ClutterCairoTexture *canvas,
  40     cairo_t *cr)
  41 {
  42   EmpathyRoundedRectangle *self = EMPATHY_ROUNDED_RECTANGLE (canvas);
  43   guint width, height;
  44   guint border_width;
  45   gdouble tmp_alpha;
  46   gdouble radius;
  47
  48   width = self->priv->width;
  49   height = self->priv->height;
  50   radius = self->priv->height / self->priv->round_factor;
  51   border_width = self->priv->border_width;
  52
  53   /* compute the composited opacity of the actor taking into
  54    * account the opacity of the color set by the user */
  55   tmp_alpha = (clutter_actor_get_paint_opacity (CLUTTER_ACTOR (self))
  56                * self->priv->border_color.alpha) / 255.;
  57
  58   cairo_set_source_rgba (cr,
  59       self->priv->border_color.red / 255.,
  60       self->priv->border_color.green / 255.,
  61       self->priv->border_color.blue / 255.,
  62       tmp_alpha);
  63
  64   cairo_set_line_width (cr, border_width);
  65
  66   cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
  67   cairo_paint (cr);
  68   cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
  69
  70   /* make room for the portion of the border drawn on the outside */
  71   cairo_translate (cr, border_width/2.0, border_width/2.0);
  72
  73   cairo_new_sub_path (cr);
  74   cairo_arc (cr, width - radius, radius, radius,
  75       -M_PI/2.0, 0);
  76   cairo_arc (cr, width - radius, height - radius, radius,
  77       0, M_PI/2.0);
  78   cairo_arc (cr, radius, height - radius, radius,
  79       M_PI/2.0, M_PI);
  80   cairo_arc (cr, radius, radius, radius,
  81       M_PI, -M_PI/2.0);
  82   cairo_close_path (cr);
  83
  84   cairo_stroke (cr);
  85
  86   return TRUE;
  87 }
  88
  89 static void
  90 empathy_rounded_rectangle_init (EmpathyRoundedRectangle *self)
  91 {
  92   self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
  93       EMPATHY_TYPE_ROUNDED_RECTANGLE, EmpathyRoundedRectanglePriv);
  94
  95   self->priv->border_width = 1;
  96   self->priv->round_factor = 2;
  97 }
  98
  99 static void
 100 empathy_rounded_rectangle_finalize (GObject *object)
 101 {
 102   G_OBJECT_CLASS (empathy_rounded_rectangle_parent_class)->finalize (object);
 103 }
 104
 105 static void
 106 empathy_rounded_rectangle_class_init (EmpathyRoundedRectangleClass *klass)
 107 {
 108   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 109
 110   gobject_class->finalize = empathy_rounded_rectangle_finalize;
 111
 112   g_type_class_add_private (klass, sizeof (EmpathyRoundedRectanglePriv));
 113 }
 114
 115 static void
 116 empathy_rounded_rectangle_update_surface_size (EmpathyRoundedRectangle *self)
 117 {
 118   clutter_cairo_texture_set_surface_size (CLUTTER_CAIRO_TEXTURE (self),
 119       self->priv->width + self->priv->border_width,
 120       self->priv->height + self->priv->border_width);
 121 }
 122
 123 EmpathyRoundedRectangle *
 124 empathy_rounded_rectangle_new (guint width,
 125     guint height,
 126     guint round_factor)
 127 {
 128   EmpathyRoundedRectangle *self;
 129
 130   self = EMPATHY_ROUNDED_RECTANGLE (g_object_new (EMPATHY_TYPE_ROUNDED_RECTANGLE, NULL));
 131
 132   self->priv->width = width;
 133   self->priv->height = height;
 134   self->priv->round_factor = round_factor;
 135
 136   g_signal_connect (self, "draw", G_CALLBACK (draw_cb), NULL);
 137
 138   empathy_rounded_rectangle_update_surface_size (self);
 139   clutter_cairo_texture_invalidate (CLUTTER_CAIRO_TEXTURE (self));
 140
 141   return self;
 142 }
 143
 144 void
 145 empathy_rounded_rectangle_set_border_width (EmpathyRoundedRectangle *self,
 146     guint border_width)
 147 {
 148   self->priv->border_width = border_width;
 149
 150   empathy_rounded_rectangle_update_surface_size (self);
 151   clutter_cairo_texture_invalidate (CLUTTER_CAIRO_TEXTURE (self));
 152 }
 153
 154 void
 155 empathy_rounded_rectangle_set_border_color (EmpathyRoundedRectangle *self,
 156     const ClutterColor *color)
 157 {
 158   self->priv->border_color = *color;
 159
 160   clutter_cairo_texture_invalidate (CLUTTER_CAIRO_TEXTURE (self));
 161 }