/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* 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 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/>.
*
*
*/
/**
* SECTION:clutter-util
* @short_description: Utility functions
*
* Various miscellaneous utilility functions.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib/gi18n-lib.h>
#include "clutter-main.h"
#include "clutter-interval.h"
#include "clutter-private.h"
#include "deprecated/clutter-util.h"
/**
* clutter_util_next_p2:
* @a: Value to get the next power
*
* Calculates the nearest power of two, greater than or equal to @a.
*
* Return value: The nearest power of two, greater or equal to @a.
*
* Deprecated: 1.2
*/
gint
clutter_util_next_p2 (gint a)
{
int rval = 1;
while (rval < a)
rval <<= 1;
return rval;
}
/*< private >
* _clutter_gettext:
* @str: a string to localize
*
* Retrieves the localized version of @str, using the Clutter domain
*
* Return value: the translated string
*/
const gchar *
_clutter_gettext (const gchar *str)
{
return g_dgettext (GETTEXT_PACKAGE, str);
}
/* Help macros to scale from OpenGL <-1,1> coordinates system to
* window coordinates ranging [0,window-size]
*/
#define MTX_GL_SCALE_X(x,w,v1,v2) ((((((x) / (w)) + 1.0f) / 2.0f) * (v1)) + (v2))
#define MTX_GL_SCALE_Y(y,w,v1,v2) ((v1) - (((((y) / (w)) + 1.0f) / 2.0f) * (v1)) + (v2))
#define MTX_GL_SCALE_Z(z,w,v1,v2) (MTX_GL_SCALE_X ((z), (w), (v1), (v2)))
typedef struct _ClutterVertex4
{
float x;
float y;
float z;
float w;
} ClutterVertex4;
void
_clutter_util_fully_transform_vertices (const CoglMatrix *modelview,
const CoglMatrix *projection,
const float *viewport,
const ClutterVertex *vertices_in,
ClutterVertex *vertices_out,
int n_vertices)
{
CoglMatrix modelview_projection;
ClutterVertex4 *vertices_tmp;
int i;
vertices_tmp = g_alloca (sizeof (ClutterVertex4) * n_vertices);
if (n_vertices >= 4)
{
/* XXX: we should find a way to cache this per actor */
cogl_matrix_multiply (&modelview_projection,
projection,
modelview);
cogl_matrix_project_points (&modelview_projection,
3,
sizeof (ClutterVertex),
vertices_in,
sizeof (ClutterVertex4),
vertices_tmp,
n_vertices);
}
else
{
cogl_matrix_transform_points (modelview,
3,
sizeof (ClutterVertex),
vertices_in,
sizeof (ClutterVertex4),
vertices_tmp,
n_vertices);
cogl_matrix_project_points (projection,
3,
sizeof (ClutterVertex4),
vertices_tmp,
sizeof (ClutterVertex4),
vertices_tmp,
n_vertices);
}
for (i = 0; i < n_vertices; i++)
{
ClutterVertex4 vertex_tmp = vertices_tmp[i];
ClutterVertex *vertex_out = &vertices_out[i];
/* Finally translate from OpenGL coords to window coords */
vertex_out->x = MTX_GL_SCALE_X (vertex_tmp.x, vertex_tmp.w,
viewport[2], viewport[0]);
vertex_out->y = MTX_GL_SCALE_Y (vertex_tmp.y, vertex_tmp.w,
viewport[3], viewport[1]);
}
}
/*< private >
* _clutter_util_rectangle_union:
* @src1: first rectangle to union
* @src2: second rectangle to union
* @dest: (out): return location for the unioned rectangle
*
* Calculates the union of two rectangles.
*
* The union of rectangles @src1 and @src2 is the smallest rectangle which
* includes both @src1 and @src2 within it.
*
* It is allowed for @dest to be the same as either @src1 or @src2.
*
* This function should really be in Cairo.
*/
void
_clutter_util_rectangle_union (const cairo_rectangle_int_t *src1,
const cairo_rectangle_int_t *src2,
cairo_rectangle_int_t *dest)
{
int dest_x, dest_y;
dest_x = MIN (src1->x, src2->x);
dest_y = MIN (src1->y, src2->y);
dest->width = MAX (src1->x + src1->width, src2->x + src2->width) - dest_x;
dest->height = MAX (src1->y + src1->height, src2->y + src2->height) - dest_y;
dest->x = dest_x;
dest->y = dest_y;
}
typedef struct
{
GType value_type;
ClutterProgressFunc func;
} ProgressData;
G_LOCK_DEFINE_STATIC (progress_funcs);
static GHashTable *progress_funcs = NULL;
gboolean
_clutter_has_progress_function (GType gtype)
{
const char *type_name = g_type_name (gtype);
if (progress_funcs == NULL)
return FALSE;
return g_hash_table_lookup (progress_funcs, type_name) != NULL;
}
gboolean
_clutter_run_progress_function (GType gtype,
const GValue *initial,
const GValue *final,
gdouble progress,
GValue *retval)
{
ProgressData *pdata;
gboolean res;
G_LOCK (progress_funcs);
if (G_UNLIKELY (progress_funcs == NULL))
{
res = FALSE;
goto out;
}
pdata = g_hash_table_lookup (progress_funcs, g_type_name (gtype));
if (G_UNLIKELY (pdata == NULL))
{
res = FALSE;
goto out;
}
res = pdata->func (initial, final, progress, retval);
out:
G_UNLOCK (progress_funcs);
return res;
}
static void
progress_data_destroy (gpointer data_)
{
g_slice_free (ProgressData, data_);
}
/**
* clutter_interval_register_progress_func: (skip)
* @value_type: a #GType
* @func: a #ClutterProgressFunc, or %NULL to unset a previously
* set progress function
*
* Sets the progress function for a given @value_type, like:
*
* |[
* clutter_interval_register_progress_func (MY_TYPE_FOO,
* my_foo_progress);
* ]|
*
* Whenever a #ClutterInterval instance using the default
* #ClutterInterval::compute_value implementation is set as an
* interval between two #GValue of type @value_type, it will call
* @func to establish the value depending on the given progress,
* for instance:
*
* |[
* static gboolean
* my_int_progress (const GValue *a,
* const GValue *b,
* gdouble progress,
* GValue *retval)
* {
* gint ia = g_value_get_int (a);
* gint ib = g_value_get_int (b);
* gint res = factor * (ib - ia) + ia;
*
* g_value_set_int (retval, res);
*
* return TRUE;
* }
*
* clutter_interval_register_progress_func (G_TYPE_INT, my_int_progress);
* ]|
*
* To unset a previously set progress function of a #GType, pass %NULL
* for @func.
*
* Since: 1.0
*/
void
clutter_interval_register_progress_func (GType value_type,
ClutterProgressFunc func)
{
ProgressData *progress_func;
const char *type_name;
g_return_if_fail (value_type != G_TYPE_INVALID);
type_name = g_type_name (value_type);
G_LOCK (progress_funcs);
if (G_UNLIKELY (progress_funcs == NULL))
progress_funcs = g_hash_table_new_full (NULL, NULL,
NULL,
progress_data_destroy);
progress_func =
g_hash_table_lookup (progress_funcs, type_name);
if (G_UNLIKELY (progress_func))
{
if (func == NULL)
{
g_hash_table_remove (progress_funcs, type_name);
g_slice_free (ProgressData, progress_func);
}
else
progress_func->func = func;
}
else
{
progress_func = g_slice_new (ProgressData);
progress_func->value_type = value_type;
progress_func->func = func;
g_hash_table_replace (progress_funcs,
(gpointer) type_name,
progress_func);
}
G_UNLOCK (progress_funcs);
}