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mutter/tests/interactive/test-paint-wrapper.c
Emmanuele Bassi d6d208da7d Remove Units from the public API 
With the recent change to internal floating point values, ClutterUnit
has become a redundant type, defined to be a float. All integer entry
points are being internally converted to floating point values to be
passed to the GL pipeline with the least amount of conversion.

ClutterUnit is thus exposed as just a "pixel with fractionary bits",
and not -- as users might think -- as generic, resolution and device
independent units. not that it was the case, but a definitive amount
of people was convinced it did provide this "feature", and was flummoxed
about the mere existence of this type.

So, having ClutterUnit exposed in the public API doubles the entry
points and has the following disadvantages:

  - we have to maintain twice the amount of entry points in ClutterActor
  - we still do an integer-to-float implicit conversion
  - we introduce a weird impedance between pixels and "pixels with
    fractionary bits"
  - language bindings will have to choose what to bind, and resort
    to manually overriding the API
    + *except* for language bindings based on GObject-Introspection, as
      they cannot do manual overrides, thus will replicate the entire
      set of entry points

For these reason, we should coalesces every Actor entry point for
pixels and for ClutterUnit into a single entry point taking a float,
like:

  void clutter_actor_set_x (ClutterActor *self,
                            gfloat        x);
  void clutter_actor_get_size (ClutterActor *self,
                               gfloat       *width,
                               gfloat       *height);
  gfloat clutter_actor_get_height (ClutterActor *self);

etc.

The issues I have identified are:

  - we'll have a two cases of compiler warnings:
    - printf() format of the return values from %d to %f
    - clutter_actor_get_size() taking floats instead of unsigned ints
  - we'll have a problem with varargs when passing an integer instead
    of a floating point value, except on 64bit platforms where the
    size of a float is the same as the size of an int

To be clear: the *intent* of the API should not change -- we still use
pixels everywhere -- but:

  - we remove ambiguity in the API with regard to pixels and units
  - we remove entry points we get to maintain for the whole 1.0
    version of the API
  - we make things simpler to bind for both manual language bindings
    and automatic (gobject-introspection based) ones
  - we have the simplest API possible while still exposing the
    capabilities of the underlying GL implementation
2009-05-06 16:44:47 +01:00

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#include <gmodule.h>
#include <clutter/clutter.h>
#if defined (_MSC_VER) && !defined (_USE_MATH_DEFINES)
#define _USE_MATH_DEFINES
#endif
#include <math.h>
#include <errno.h>
#include <stdlib.h>
#include <glib.h>
#define TRAILS 0
#define NHANDS 6
#define RADIUS ((CLUTTER_STAGE_WIDTH()+CLUTTER_STAGE_HEIGHT())/NHANDS)
typedef struct SuperOH
{
ClutterActor **hand, *bgtex;
ClutterActor *group;
gboolean *paint_guards;
} SuperOH;
static gint n_hands = NHANDS;
static GOptionEntry super_oh_entries[] = {
{
"num-hands", 'n',
0,
G_OPTION_ARG_INT, &n_hands,
"Number of hands", "HANDS"
},
{ NULL }
};
static gint
get_radius (void)
{
return (CLUTTER_STAGE_HEIGHT() + CLUTTER_STAGE_HEIGHT()) / n_hands ;
}
/* input handler */
static gboolean
input_cb (ClutterStage *stage,
ClutterEvent *event,
gpointer data)
{
if (event->type == CLUTTER_BUTTON_PRESS)
{
ClutterButtonEvent *button_event;
ClutterActor *e;
gfloat x, y;
clutter_event_get_coords (event, &x, &y);
button_event = (ClutterButtonEvent *) event;
g_print ("*** button press event (button:%d) ***\n",
button_event->button);
e = clutter_stage_get_actor_at_pos (stage, CLUTTER_PICK_ALL, x, y);
if (e && (CLUTTER_IS_TEXTURE (e) || CLUTTER_IS_CLONE (e)))
{
clutter_actor_hide (e);
return TRUE;
}
}
else if (event->type == CLUTTER_KEY_RELEASE)
{
ClutterKeyEvent *kev = (ClutterKeyEvent *) event;
g_print ("*** key press event (key:%c) ***\n",
clutter_key_event_symbol (kev));
if (clutter_key_event_symbol (kev) == CLUTTER_q)
{
clutter_main_quit ();
return TRUE;
}
}
return FALSE;
}
/* Timeline handler */
static void
frame_cb (ClutterTimeline *timeline,
gint frame_num,
gpointer data)
{
SuperOH *oh = (SuperOH *)data;
gint i;
/* Rotate everything clockwise about stage center*/
clutter_actor_set_rotation (CLUTTER_ACTOR (oh->group),
CLUTTER_Z_AXIS,
frame_num,
CLUTTER_STAGE_WIDTH () / 2,
CLUTTER_STAGE_HEIGHT () / 2,
0);
for (i = 0; i < n_hands; i++)
{
gdouble scale_x, scale_y;
clutter_actor_get_scale (oh->hand[i], &scale_x, &scale_y);
/* Rotate each hand around there centers - to get this we need
* to take into account any scaling.
*
* FIXME: scaling causes drift so disabled for now. Need rotation
* unit based functions to fix.
*/
clutter_actor_set_rotation (oh->hand[i], CLUTTER_Z_AXIS,
- 6.0 * frame_num, 0, 0, 0);
}
}
static void
hand_pre_paint (ClutterActor *actor,
gpointer user_data)
{
SuperOH *oh = (SuperOH *) user_data;
gfloat w, h;
int actor_num;
for (actor_num = 0; oh->hand[actor_num] != actor; actor_num++);
g_assert (oh->paint_guards[actor_num] == FALSE);
clutter_actor_get_size (actor, &w, &h);
cogl_set_source_color4ub (255, 0, 0, 128);
cogl_rectangle (0, 0, w / 2, h / 2);
oh->paint_guards[actor_num] = TRUE;
}
static void
hand_post_paint (ClutterActor *actor,
gpointer user_data)
{
SuperOH *oh = (SuperOH *) user_data;
gfloat w, h;
int actor_num;
for (actor_num = 0; oh->hand[actor_num] != actor; actor_num++);
g_assert (oh->paint_guards[actor_num] == TRUE);
clutter_actor_get_size (actor, &w, &h);
cogl_set_source_color4ub (0, 255, 0, 128);
cogl_rectangle (w / 2, h / 2, w, h);
oh->paint_guards[actor_num] = FALSE;
}
static gdouble
my_sine_wave (ClutterAlpha *alpha,
gpointer dummy G_GNUC_UNUSED)
{
ClutterTimeline *timeline = clutter_alpha_get_timeline (alpha);
gdouble progress = clutter_timeline_get_progress (timeline);
return sin (progress * G_PI);
}
G_MODULE_EXPORT int
test_paint_wrapper_main (int argc, char *argv[])
{
ClutterTimeline *timeline;
ClutterAlpha *alpha;
ClutterBehaviour *scaler_1, *scaler_2;
ClutterActor *stage;
ClutterColor stage_color = { 0x61, 0x64, 0x8c, 0xff };
SuperOH *oh;
gint i;
GError *error;
error = NULL;
clutter_init_with_args (&argc, &argv,
NULL,
super_oh_entries,
NULL,
&error);
if (error)
{
g_warning ("Unable to initialise Clutter:\n%s",
error->message);
g_error_free (error);
exit (1);
}
stage = clutter_stage_get_default ();
clutter_actor_set_size (stage, 800, 600);
clutter_stage_set_title (CLUTTER_STAGE (stage), "Actors Test");
clutter_stage_set_color (CLUTTER_STAGE (stage),
&stage_color);
oh = g_new(SuperOH, 1);
/* Create a timeline to manage animation */
timeline = clutter_timeline_new (360, 60); /* num frames, fps */
g_object_set (timeline, "loop", TRUE, NULL); /* have it loop */
/* fire a callback for frame change */
g_signal_connect (timeline, "new-frame", G_CALLBACK (frame_cb), oh);
/* Set up some behaviours to handle scaling */
alpha = clutter_alpha_new_with_func (timeline, my_sine_wave, NULL, NULL);
scaler_1 = clutter_behaviour_scale_new (alpha,
0.5, 0.5,
1.0, 1.0);
scaler_2 = clutter_behaviour_scale_new (alpha,
1.0, 1.0,
0.5, 0.5);
/* create a new group to hold multiple actors in a group */
oh->group = clutter_group_new();
oh->hand = g_new (ClutterActor*, n_hands);
for (i = 0; i < n_hands; i++)
{
gint x, y, w, h;
gint radius = get_radius ();
/* Create a texture from file, then clone in to same resources */
if (i == 0)
{
if ((oh->hand[i] = clutter_texture_new_from_file ("redhand.png",
&error)) == NULL)
{
g_error ("image load failed: %s", error->message);
exit (1);
}
}
else
oh->hand[i] = clutter_clone_new (oh->hand[0]);
/* paint something before each hand */
g_signal_connect (oh->hand[i],
"paint", G_CALLBACK (hand_pre_paint),
oh);
/* paint something after each hand */
g_signal_connect_after (oh->hand[i],
"paint", G_CALLBACK (hand_post_paint),
oh);
/* Place around a circle */
w = clutter_actor_get_width (oh->hand[0]);
h = clutter_actor_get_height (oh->hand[0]);
x = CLUTTER_STAGE_WIDTH () / 2
+ radius
* cos (i * M_PI / (n_hands / 2))
- w / 2;
y = CLUTTER_STAGE_HEIGHT () / 2
+ radius
* sin (i * M_PI / (n_hands / 2))
- h / 2;
clutter_actor_set_position (oh->hand[i], x, y);
clutter_actor_move_anchor_point_from_gravity (oh->hand[i],
CLUTTER_GRAVITY_CENTER);
/* Add to our group group */
clutter_container_add_actor (CLUTTER_CONTAINER (oh->group), oh->hand[i]);
#if 1 /* FIXME: disabled as causes drift? - see comment above */
if (i % 2)
clutter_behaviour_apply (scaler_1, oh->hand[i]);
else
clutter_behaviour_apply (scaler_2, oh->hand[i]);
#endif
}
oh->paint_guards = g_malloc0 (sizeof (gboolean) * n_hands);
/* Add the group to the stage */
clutter_container_add_actor (CLUTTER_CONTAINER (stage),
CLUTTER_ACTOR (oh->group));
/* Show everying ( and map window ) */
clutter_actor_show (stage);
g_signal_connect (stage, "button-press-event",
G_CALLBACK (input_cb),
oh);
g_signal_connect (stage, "key-release-event",
G_CALLBACK (input_cb),
oh);
/* and start it */
clutter_timeline_start (timeline);
clutter_main ();
g_free (oh->hand);
g_free (oh->paint_guards);
g_free (oh);
return 0;
}
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