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mutter-performance-source/doc/cookbook/examples/textures-crossfade.c

143 lines
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C
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#include <stdlib.h>
#include <clutter/clutter.h>
static gchar *source = NULL;
static gchar *target = NULL;
static guint duration = 1000;
static GOptionEntry entries[] = {
{
"source", 's',
0,
G_OPTION_ARG_FILENAME, &source,
"The source image of the cross-fade", "FILE"
},
{
"target", 't',
0,
G_OPTION_ARG_FILENAME, &target,
"The target image of the cross-fade", "FILE"
},
{
"duration", 'd',
0,
G_OPTION_ARG_INT, &duration,
"The duration of the cross-fade, in milliseconds", "MSECS"
},
{ NULL }
};
static gboolean
start_animation (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
ClutterState *transitions = CLUTTER_STATE (user_data);
clutter_state_set_state (transitions, "show-top");
return TRUE;
}
static gboolean
load_image (ClutterTexture *texture,
gchar *image_path)
{
GError *error = NULL;
gboolean success = clutter_texture_set_from_file (CLUTTER_TEXTURE (texture),
image_path,
&error);
if (error != NULL)
{
g_warning ("Error loading %s\n%s", image_path, error->message);
g_error_free (error);
exit (EXIT_FAILURE);
}
return success;
}
int
main (int argc, char *argv[])
{
GError *error = NULL;
/* UI */
ClutterActor *stage;
ClutterLayoutManager *layout;
ClutterActor *box;
ClutterActor *top, *bottom;
ClutterState *transitions;
clutter_init_with_args (&argc, &argv,
" - cross-fade", entries,
NULL,
NULL);
if (source == NULL || target == NULL)
{
g_print ("Usage: %s -s <source> -t <target> [-d <duration>]\n", argv[0]);
exit (EXIT_FAILURE);
}
clutter_init (&argc, &argv);
stage = clutter_stage_get_default ();
clutter_stage_set_title (CLUTTER_STAGE (stage), "cross-fade");
clutter_actor_set_size (stage, 400, 300);
clutter_actor_show (stage);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
layout = clutter_bin_layout_new (CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_BIN_ALIGNMENT_CENTER);
box = clutter_box_new (layout);
clutter_actor_set_size (box, 400, 300);
bottom = clutter_texture_new ();
top = clutter_texture_new ();
clutter_container_add_actor (CLUTTER_CONTAINER (box), bottom);
clutter_container_add_actor (CLUTTER_CONTAINER (box), top);
clutter_container_add_actor (CLUTTER_CONTAINER (stage), box);
/* load the first image into the bottom */
load_image (CLUTTER_TEXTURE (bottom), source);
/* load the second image into the top */
load_image (CLUTTER_TEXTURE (top), target);
/* animations */
transitions = clutter_state_new ();
clutter_state_set (transitions, NULL, "show-bottom",
top, "opacity", CLUTTER_LINEAR, 0,
bottom, "opacity", CLUTTER_LINEAR, 255,
NULL);
clutter_state_set (transitions, NULL, "show-top",
top, "opacity", CLUTTER_EASE_IN_CUBIC, 255,
bottom, "opacity", CLUTTER_EASE_IN_CUBIC, 0,
NULL);
clutter_state_set_duration (transitions, NULL, NULL, duration);
/* make the bottom opaque and top transparent */
clutter_state_warp_to_state (transitions, "show-bottom");
/* on key press, fade in the top texture and fade out the bottom texture */
g_signal_connect (stage,
"key-press-event",
G_CALLBACK (start_animation),
transitions);
clutter_actor_show (stage);
clutter_main ();
g_object_unref (transitions);
if (error != NULL)
g_error_free (error);
return EXIT_SUCCESS;
}