--- /dev/null
+/*
+ * Copyright © 2012 Red Hat Inc.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte@gnome.org>
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include "gtkcssimagecrossfadeprivate.h"
+
+#include "gtkcssnumbervalueprivate.h"
+
+G_DEFINE_TYPE (GtkCssImageCrossFade, _gtk_css_image_cross_fade, GTK_TYPE_CSS_IMAGE)
+
+static int
+gtk_css_image_cross_fade_get_width (GtkCssImage *image)
+{
+ GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
+ int start_width, end_width;
+
+ if (cross_fade->start)
+ {
+ start_width = _gtk_css_image_get_width (cross_fade->start);
+ /* no intrinsic width, what now? */
+ if (start_width == 0)
+ return 0;
+ }
+ else
+ start_width = 0;
+
+ if (cross_fade->end)
+ {
+ end_width = _gtk_css_image_get_width (cross_fade->end);
+ /* no intrinsic width, what now? */
+ if (end_width == 0)
+ return 0;
+ }
+ else
+ end_width = 0;
+
+ return start_width + (end_width - start_width) * cross_fade->progress;
+}
+
+static int
+gtk_css_image_cross_fade_get_height (GtkCssImage *image)
+{
+ GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
+ int start_height, end_height;
+
+ if (cross_fade->start)
+ {
+ start_height = _gtk_css_image_get_height (cross_fade->start);
+ /* no intrinsic height, what now? */
+ if (start_height == 0)
+ return 0;
+ }
+ else
+ start_height = 0;
+
+ if (cross_fade->end)
+ {
+ end_height = _gtk_css_image_get_height (cross_fade->end);
+ /* no intrinsic height, what now? */
+ if (end_height == 0)
+ return 0;
+ }
+ else
+ end_height = 0;
+
+ return start_height + (end_height - start_height) * cross_fade->progress;
+}
+
+static void
+gtk_css_image_cross_fade_draw (GtkCssImage *image,
+ cairo_t *cr,
+ double width,
+ double height)
+{
+ GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
+
+ if (cross_fade->progress <= 0.0)
+ {
+ if (cross_fade->start)
+ _gtk_css_image_draw (cross_fade->start, cr, width, height);
+ }
+ else if (cross_fade->progress >= 1.0)
+ {
+ if (cross_fade->end)
+ _gtk_css_image_draw (cross_fade->end, cr, width, height);
+ }
+ else
+ {
+ cairo_surface_t *surface;
+
+ if (cross_fade->start && cross_fade->end)
+ {
+ /* to reduce the group size */
+ cairo_rectangle (cr, 0, 0, width, height);
+ cairo_clip (cr);
+
+ cairo_push_group (cr);
+
+ _gtk_css_image_draw (cross_fade->start, cr, width, height);
+
+ surface = _gtk_css_image_get_surface (cross_fade->end,
+ cairo_get_target (cr),
+ width, height);
+ cairo_set_source_surface (cr, surface, 0, 0);
+ cairo_paint_with_alpha (cr, cross_fade->progress);
+ cairo_surface_destroy (surface);
+
+ cairo_pop_group_to_source (cr);
+ cairo_paint (cr);
+ }
+ else if (cross_fade->start || cross_fade->end)
+ {
+ surface = _gtk_css_image_get_surface (cross_fade->start ? cross_fade->start : cross_fade->end,
+ cairo_get_target (cr),
+ width, height);
+ cairo_set_source_surface (cr, surface, 0, 0);
+ cairo_paint_with_alpha (cr, cross_fade->start ? 1.0 - cross_fade->progress : cross_fade->progress);
+ cairo_surface_destroy (surface);
+ }
+ }
+}
+
+static gboolean
+gtk_css_image_cross_fade_parse (GtkCssImage *image,
+ GtkCssParser *parser,
+ GFile *base)
+{
+ GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
+ GtkCssValue *number;
+
+ if (!_gtk_css_parser_try (parser, "cross-fade(", TRUE))
+ {
+ _gtk_css_parser_error (parser, "Expected 'cross-fade('");
+ return FALSE;
+ }
+
+ cross_fade->start = _gtk_css_image_new_parse (parser, base);
+ if (cross_fade->start == NULL)
+ return FALSE;
+
+ if (!_gtk_css_parser_try (parser, ",", TRUE))
+ {
+ _gtk_css_parser_error (parser, "Missing comma after first image");
+ return FALSE;
+ }
+
+ cross_fade->end = _gtk_css_image_new_parse (parser, base);
+ if (cross_fade->end == NULL)
+ return FALSE;
+
+ if (!_gtk_css_parser_try (parser, ",", TRUE))
+ {
+ _gtk_css_parser_error (parser, "Missing comma after second image");
+ return FALSE;
+ }
+
+ if (!_gtk_css_parser_try (parser, ")", TRUE))
+ {
+ _gtk_css_parser_error (parser, "Missing closing bracket");
+ return FALSE;
+ }
+
+ number = _gtk_css_number_value_parse (parser, GTK_CSS_PARSE_PERCENT | GTK_CSS_POSITIVE_ONLY);
+ if (number == NULL)
+ return FALSE;
+ cross_fade->progress = _gtk_css_number_value_get (number, 1);
+ _gtk_css_value_unref (number);
+
+ if (cross_fade->progress > 100)
+ {
+ _gtk_css_parser_error (parser, "Percentages ovre 100%% are not allowed");
+ return FALSE;
+ }
+ cross_fade->progress /= 100.0;
+
+ return TRUE;
+}
+
+static void
+gtk_css_image_cross_fade_print (GtkCssImage *image,
+ GString *string)
+{
+ GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
+
+ g_string_append (string, "cross_fade(");
+ if (cross_fade->start)
+ _gtk_css_image_print (cross_fade->start, string);
+ else
+ g_string_append (string, "none");
+ g_string_append (string, ",");
+ if (cross_fade->end)
+ _gtk_css_image_print (cross_fade->end, string);
+ else
+ g_string_append (string, "none");
+ g_string_append (string, ",");
+ g_string_append_printf (string, "%g%%", cross_fade->progress * 100.0);
+ g_string_append (string, ")");
+}
+
+static void
+gtk_css_image_cross_fade_dispose (GObject *object)
+{
+ GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (object);
+
+ g_clear_object (&cross_fade->start);
+ g_clear_object (&cross_fade->end);
+
+ G_OBJECT_CLASS (_gtk_css_image_cross_fade_parent_class)->dispose (object);
+}
+
+static void
+_gtk_css_image_cross_fade_class_init (GtkCssImageCrossFadeClass *klass)
+{
+ GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+ image_class->get_width = gtk_css_image_cross_fade_get_width;
+ image_class->get_height = gtk_css_image_cross_fade_get_height;
+ image_class->draw = gtk_css_image_cross_fade_draw;
+ image_class->parse = gtk_css_image_cross_fade_parse;
+ image_class->print = gtk_css_image_cross_fade_print;
+
+ object_class->dispose = gtk_css_image_cross_fade_dispose;
+}
+
+static void
+_gtk_css_image_cross_fade_init (GtkCssImageCrossFade *image_cross_fade)
+{
+}
+
+GtkCssImage *
+_gtk_css_image_cross_fade_new (GtkCssImage *start,
+ GtkCssImage *end,
+ double progress)
+{
+ GtkCssImageCrossFade *cross_fade;
+
+ g_return_val_if_fail (start == NULL || GTK_IS_CSS_IMAGE (start), NULL);
+ g_return_val_if_fail (end == NULL || GTK_IS_CSS_IMAGE (end), NULL);
+
+ cross_fade = g_object_new (GTK_TYPE_CSS_IMAGE_CROSS_FADE, NULL);
+ if (start)
+ cross_fade->start = g_object_ref (start);
+ if (end)
+ cross_fade->end = g_object_ref (end);
+ cross_fade->progress = progress;
+
+ return GTK_CSS_IMAGE (cross_fade);
+}
+
--- /dev/null
+/*
+ * Copyright © 2012 Red Hat Inc.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte@gnome.org>
+ */
+
+#ifndef __GTK_CSS_IMAGE_CROSS_FADE_PRIVATE_H__
+#define __GTK_CSS_IMAGE_CROSS_FADE_PRIVATE_H__
+
+#include "gtk/gtkcssimageprivate.h"
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_CSS_IMAGE_CROSS_FADE (_gtk_css_image_cross_fade_get_type ())
+#define GTK_CSS_IMAGE_CROSS_FADE(obj) (G_TYPE_CHECK_INSTANCE_CAST (obj, GTK_TYPE_CSS_IMAGE_CROSS_FADE, GtkCssImageCrossFade))
+#define GTK_CSS_IMAGE_CROSS_FADE_CLASS(cls) (G_TYPE_CHECK_CLASS_CAST (cls, GTK_TYPE_CSS_IMAGE_CROSS_FADE, GtkCssImageCrossFadeClass))
+#define GTK_IS_CSS_IMAGE_CROSS_FADE(obj) (G_TYPE_CHECK_INSTANCE_TYPE (obj, GTK_TYPE_CSS_IMAGE_CROSS_FADE))
+#define GTK_IS_CSS_IMAGE_CROSS_FADE_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE (obj, GTK_TYPE_CSS_IMAGE_CROSS_FADE))
+#define GTK_CSS_IMAGE_CROSS_FADE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_CSS_IMAGE_CROSS_FADE, GtkCssImageCrossFadeClass))
+
+typedef struct _GtkCssImageCrossFade GtkCssImageCrossFade;
+typedef struct _GtkCssImageCrossFadeClass GtkCssImageCrossFadeClass;
+
+struct _GtkCssImageCrossFade
+{
+ GtkCssImage parent;
+
+ GtkCssImage *start;
+ GtkCssImage *end;
+ double progress;
+};
+
+struct _GtkCssImageCrossFadeClass
+{
+ GtkCssImageClass parent_class;
+};
+
+GType _gtk_css_image_cross_fade_get_type (void) G_GNUC_CONST;
+
+GtkCssImage * _gtk_css_image_cross_fade_new (GtkCssImage *start,
+ GtkCssImage *end,
+ double progress);
+
+G_END_DECLS
+
+#endif /* __GTK_CSS_IMAGE_CROSS_FADE_PRIVATE_H__ */
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