src/empathy-rounded-effect.c

   1 /*
   2  * empathy-rounded-effect.c - Source for EmpathyRoundedEffect
   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-effect.h"
  23
  24 G_DEFINE_TYPE (EmpathyRoundedEffect,
  25     empathy_rounded_effect,
  26     CLUTTER_TYPE_EFFECT)
  27
  28 static void
  29 empathy_rounded_effect_paint (ClutterEffect *effect,
  30     ClutterEffectPaintFlags flags)
  31 {
  32   EmpathyRoundedEffect *self = EMPATHY_ROUNDED_EFFECT (effect);
  33   ClutterActor *actor;
  34   ClutterActorBox allocation = { 0, };
  35   gfloat width, height;
  36
  37   actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (self));
  38   clutter_actor_get_allocation_box (actor, &allocation);
  39   clutter_actor_box_get_size (&allocation, &width, &height);
  40
  41   cogl_path_new ();
  42
  43   /* Create and store a path describing a rounded rectangle. The small
  44    * size of the preview window makes the radius of the rounded corners
  45    * very small too, so we can safely use a very coarse angle step
  46    * without loosing rendering accuracy. It also significantly reduces
  47    * the time spent in the underlying internal cogl path functions */
  48   cogl_path_round_rectangle (0, 0, width, height, height / 16., 15);
  49
  50   cogl_clip_push_from_path ();
  51
  52   /* Flip */
  53   cogl_push_matrix ();
  54   cogl_translate (width, 0, 0);
  55   cogl_scale (-1, 1, 1);
  56
  57   clutter_actor_continue_paint (actor);
  58
  59   cogl_pop_matrix ();
  60   cogl_clip_pop ();
  61 }
  62
  63 static void
  64 empathy_rounded_effect_init (EmpathyRoundedEffect *self)
  65 {
  66 }
  67
  68 static void
  69 empathy_rounded_effect_class_init (EmpathyRoundedEffectClass *klass)
  70 {
  71   ClutterEffectClass *effect_class = CLUTTER_EFFECT_CLASS (klass);
  72
  73   effect_class->paint = empathy_rounded_effect_paint;
  74 }
  75
  76 ClutterEffect *
  77 empathy_rounded_effect_new (void)
  78 {
  79   return CLUTTER_EFFECT (
  80     g_object_new (EMPATHY_TYPE_ROUNDED_EFFECT, NULL));
  81 }