2 * Copyright © 2012 Red Hat Inc.
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 2.1 of the License, or (at your option) any later version.
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.
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/>.
17 * Authors: Benjamin Otte <otte@gnome.org>
24 #include "gtkcssimagecrossfadeprivate.h"
26 #include "gtkcssnumbervalueprivate.h"
28 G_DEFINE_TYPE (GtkCssImageCrossFade, _gtk_css_image_cross_fade, GTK_TYPE_CSS_IMAGE)
31 gtk_css_image_cross_fade_get_width (GtkCssImage *image)
33 GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
34 int start_width, end_width;
36 if (cross_fade->start)
38 start_width = _gtk_css_image_get_width (cross_fade->start);
39 /* no intrinsic width, what now? */
48 end_width = _gtk_css_image_get_width (cross_fade->end);
49 /* no intrinsic width, what now? */
56 return start_width + (end_width - start_width) * cross_fade->progress;
60 gtk_css_image_cross_fade_get_height (GtkCssImage *image)
62 GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
63 int start_height, end_height;
65 if (cross_fade->start)
67 start_height = _gtk_css_image_get_height (cross_fade->start);
68 /* no intrinsic height, what now? */
69 if (start_height == 0)
77 end_height = _gtk_css_image_get_height (cross_fade->end);
78 /* no intrinsic height, what now? */
85 return start_height + (end_height - start_height) * cross_fade->progress;
89 gtk_css_image_cross_fade_draw (GtkCssImage *image,
94 GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
96 if (cross_fade->progress <= 0.0)
98 if (cross_fade->start)
99 _gtk_css_image_draw (cross_fade->start, cr, width, height);
101 else if (cross_fade->progress >= 1.0)
104 _gtk_css_image_draw (cross_fade->end, cr, width, height);
108 cairo_surface_t *surface;
110 if (cross_fade->start && cross_fade->end)
112 /* to reduce the group size */
113 cairo_rectangle (cr, 0, 0, width, height);
116 cairo_push_group (cr);
118 _gtk_css_image_draw (cross_fade->start, cr, width, height);
120 surface = _gtk_css_image_get_surface (cross_fade->end,
121 cairo_get_target (cr),
123 cairo_set_source_surface (cr, surface, 0, 0);
124 cairo_paint_with_alpha (cr, cross_fade->progress);
125 cairo_surface_destroy (surface);
127 cairo_pop_group_to_source (cr);
130 else if (cross_fade->start || cross_fade->end)
132 surface = _gtk_css_image_get_surface (cross_fade->start ? cross_fade->start : cross_fade->end,
133 cairo_get_target (cr),
135 cairo_set_source_surface (cr, surface, 0, 0);
136 cairo_paint_with_alpha (cr, cross_fade->start ? 1.0 - cross_fade->progress : cross_fade->progress);
137 cairo_surface_destroy (surface);
143 gtk_css_image_cross_fade_parse (GtkCssImage *image,
144 GtkCssParser *parser)
146 GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
149 if (!_gtk_css_parser_try (parser, "cross-fade(", TRUE))
151 _gtk_css_parser_error (parser, "Expected 'cross-fade('");
155 cross_fade->start = _gtk_css_image_new_parse (parser);
156 if (cross_fade->start == NULL)
159 if (!_gtk_css_parser_try (parser, ",", TRUE))
161 _gtk_css_parser_error (parser, "Missing comma after first image");
165 cross_fade->end = _gtk_css_image_new_parse (parser);
166 if (cross_fade->end == NULL)
169 if (!_gtk_css_parser_try (parser, ",", TRUE))
171 _gtk_css_parser_error (parser, "Missing comma after second image");
175 if (!_gtk_css_parser_try (parser, ")", TRUE))
177 _gtk_css_parser_error (parser, "Missing closing bracket");
181 number = _gtk_css_number_value_parse (parser, GTK_CSS_PARSE_PERCENT | GTK_CSS_POSITIVE_ONLY);
184 cross_fade->progress = _gtk_css_number_value_get (number, 1);
185 _gtk_css_value_unref (number);
187 if (cross_fade->progress > 100)
189 _gtk_css_parser_error (parser, "Percentages ovre 100%% are not allowed");
192 cross_fade->progress /= 100.0;
198 gtk_css_image_cross_fade_print (GtkCssImage *image,
201 GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
203 g_string_append (string, "cross_fade(");
204 if (cross_fade->start)
205 _gtk_css_image_print (cross_fade->start, string);
207 g_string_append (string, "none");
208 g_string_append (string, ",");
210 _gtk_css_image_print (cross_fade->end, string);
212 g_string_append (string, "none");
213 g_string_append (string, ",");
214 g_string_append_printf (string, "%g%%", cross_fade->progress * 100.0);
215 g_string_append (string, ")");
219 gtk_css_image_cross_fade_dispose (GObject *object)
221 GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (object);
223 g_clear_object (&cross_fade->start);
224 g_clear_object (&cross_fade->end);
226 G_OBJECT_CLASS (_gtk_css_image_cross_fade_parent_class)->dispose (object);
230 _gtk_css_image_cross_fade_class_init (GtkCssImageCrossFadeClass *klass)
232 GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
233 GObjectClass *object_class = G_OBJECT_CLASS (klass);
235 image_class->get_width = gtk_css_image_cross_fade_get_width;
236 image_class->get_height = gtk_css_image_cross_fade_get_height;
237 image_class->draw = gtk_css_image_cross_fade_draw;
238 image_class->parse = gtk_css_image_cross_fade_parse;
239 image_class->print = gtk_css_image_cross_fade_print;
241 object_class->dispose = gtk_css_image_cross_fade_dispose;
245 _gtk_css_image_cross_fade_init (GtkCssImageCrossFade *image_cross_fade)
250 _gtk_css_image_cross_fade_new (GtkCssImage *start,
254 GtkCssImageCrossFade *cross_fade;
256 g_return_val_if_fail (start == NULL || GTK_IS_CSS_IMAGE (start), NULL);
257 g_return_val_if_fail (end == NULL || GTK_IS_CSS_IMAGE (end), NULL);
259 cross_fade = g_object_new (GTK_TYPE_CSS_IMAGE_CROSS_FADE, NULL);
261 cross_fade->start = g_object_ref (start);
263 cross_fade->end = g_object_ref (end);
264 cross_fade->progress = progress;
266 return GTK_CSS_IMAGE (cross_fade);