Pileus Git - ~andy/gtk/blob - gtk/gtkcssimagevalue.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2011 Red Hat, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "config.h"
  19
  20 #include "gtkcssimagevalueprivate.h"
  21
  22 #include "gtkcssimagecrossfadeprivate.h"
  23
  24 struct _GtkCssValue {
  25   GTK_CSS_VALUE_BASE
  26   GtkCssImage *image;
  27 };
  28
  29 static void
  30 gtk_css_value_image_free (GtkCssValue *value)
  31 {
  32   g_object_unref (value->image);
  33   g_slice_free (GtkCssValue, value);
  34 }
  35
  36 static GtkCssValue *
  37 gtk_css_value_image_compute (GtkCssValue     *value,
  38                              GtkStyleContext *context)
  39 {
  40   GtkCssImage *image, *computed;
  41
  42   image = _gtk_css_image_value_get_image (value);
  43
  44   if (image == NULL)
  45     return _gtk_css_value_ref (value);
  46
  47   computed = _gtk_css_image_compute (image, context);
  48
  49   if (computed == image)
  50     {
  51       g_object_unref (computed);
  52       return _gtk_css_value_ref (value);
  53     }
  54
  55   return _gtk_css_image_value_new (computed);
  56 }
  57
  58 static gboolean
  59 gtk_css_value_image_equal (const GtkCssValue *value1,
  60                            const GtkCssValue *value2)
  61 {
  62   return value1->image == value2->image;
  63 }
  64
  65 static GtkCssValue *
  66 gtk_css_value_image_transition (GtkCssValue *start,
  67                                 GtkCssValue *end,
  68                                 double       progress)
  69 {
  70   GtkCssImage *fade;
  71
  72   fade = _gtk_css_image_cross_fade_new (_gtk_css_image_value_get_image (start),
  73                                         _gtk_css_image_value_get_image (end),
  74                                         progress);
  75
  76   return _gtk_css_image_value_new (fade);
  77 }
  78
  79 static void
  80 gtk_css_value_image_print (const GtkCssValue *value,
  81                            GString           *string)
  82 {
  83   if (value->image)
  84     _gtk_css_image_print (value->image, string);
  85   else
  86     g_string_append (string, "none");
  87 }
  88
  89 static const GtkCssValueClass GTK_CSS_VALUE_IMAGE = {
  90   gtk_css_value_image_free,
  91   gtk_css_value_image_compute,
  92   gtk_css_value_image_equal,
  93   gtk_css_value_image_transition,
  94   gtk_css_value_image_print
  95 };
  96
  97 GtkCssValue *
  98 _gtk_css_image_value_new (GtkCssImage *image)
  99 {
 100   static GtkCssValue none_singleton = { &GTK_CSS_VALUE_IMAGE, 1, NULL };
 101   GtkCssValue *value;
 102
 103   if (image == NULL)
 104     return _gtk_css_value_ref (&none_singleton);
 105
 106   value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_IMAGE);
 107   value->image = image;
 108
 109   return value;
 110 }
 111
 112 GtkCssImage *
 113 _gtk_css_image_value_get_image (const GtkCssValue *value)
 114 {
 115   g_return_val_if_fail (value->class == &GTK_CSS_VALUE_IMAGE, NULL);
 116
 117   return value->image;
 118 }
 119