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2008-04-17 Emmanuele Bassi <ebassi@openedhand.com>

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* clutter/Makefile.am: Add clutter-units.c

	* clutter/clutter-units.[ch]: Add a ClutterUnit fundamental
	type, and wrappers for storing it into GValues; also add a
	GParamSpec subclass for defining parameters holding ClutterUnit
	values. This allows creating GObject properties using units.

	* doc/reference/clutter-sections.txt: Document the newly
	added API.
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Emmanuele Bassi 2008-04-17 09:13:12 +00:00
parent c2cb5bf64a
commit d1ba07d0e7
5 changed files with 367 additions and 22 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2008-04-17 Emmanuele Bassi <ebassi@openedhand.com>
* clutter/Makefile.am: Add clutter-units.c
* clutter/clutter-units.[ch]: Add a ClutterUnit fundamental
type, and wrappers for storing it into GValues; also add a
GParamSpec subclass for defining parameters holding ClutterUnit
values. This allows creating GObject properties using units.
* doc/reference/clutter-sections.txt: Document the newly
added API.
2008-04-15 Matthew Allum <mallum@openedhand.com>
Work related to #873;

1
clutter/Makefile.am
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@ -166,6 +166,7 @@ source_c = \
clutter-texture.c \
clutter-timeline.c \
clutter-timeout-pool.c \
clutter-units.c \
clutter-util.c \
$(NULL)

282
clutter/clutter-units.c Normal file
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@ -0,0 +1,282 @@
/* -*- mode:C; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Tomas Frydrych <tf@openedhand.com>
*
* Copyright (C) 2007 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:clutter-units
* @short_description: A logical distance unit.
*
* Clutter units are logical units with granularity greater than that of the
* device units; they are used by #ClutterActorBox and the _units() family of
* ClutterActor functions. To convert between clutter units and device units,
* use #CLUTTER_UNITS_FROM_DEVICE and #CLUTTER_UNITS_TO_DEVICE macros.
*
* Note: It is expected that as of version 0.6 all dimensions in the public
* Clutter API will be given in clutter units. In order to ease the transition,
* two extra macros have been provided, #CLUTTER_UNITS_TMP_TO_DEVICE and
* #CLUTTER_UNITS_TMP_FROM_DEVICE. In version 0.4 these are identity macros,
* but when the API transition happens will map to #CLUTTER_UNITS_TO_DEVICE and
* #CLUTTER_UNITS_FROM_DEVICE respectively. You can use these in newly written
* code as place holders.
*
* Since: 0.4
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib-object.h>
#include <gobject/gvaluecollector.h>
#include "clutter-units.h"
#include "clutter-private.h"
static GTypeInfo _info = {
0,
NULL,
NULL,
NULL,
NULL,
NULL,
0,
0,
NULL,
NULL,
};
static GTypeFundamentalInfo _finfo = { 0, };
static void
clutter_value_init_unit (GValue *value)
{
value->data[0].v_int = 0;
}
static void
clutter_value_copy_unit (const GValue *src,
GValue *dest)
{
dest->data[0].v_int = src->data[0].v_int;
}
static gchar *
clutter_value_collect_unit (GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags)
{
value->data[0].v_int = collect_values[0].v_int;
return NULL;
}
static gchar *
clutter_value_lcopy_unit (const GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags)
{
gint32 *units_p = collect_values[0].v_pointer;
if (!units_p)
return g_strdup_printf ("value location for `%s' passed as NULL",
G_VALUE_TYPE_NAME (value));
*units_p = value->data[0].v_int;
return NULL;
}
static const GTypeValueTable _clutter_unit_value_table = {
clutter_value_init_unit,
NULL,
clutter_value_copy_unit,
NULL,
"i",
clutter_value_collect_unit,
"p",
clutter_value_lcopy_unit
};
GType
clutter_unit_get_type (void)
{
static GType _clutter_unit_type = 0;
if (G_UNLIKELY (_clutter_unit_type == 0))
{
_info.value_table = & _clutter_unit_value_table;
_clutter_unit_type =
g_type_register_fundamental (g_type_fundamental_next (),
I_("ClutterUnit"),
&_info, &_finfo, 0);
}
return _clutter_unit_type;
}
/**
* clutter_value_set_unit:
* @value: a #GValue initialized to #CLUTTER_TYPE_UNIT
* @units: the units to set
*
* Sets @value to @units
*
* Since: 0.8
*/
void
clutter_value_set_unit (GValue *value,
ClutterUnit units)
{
g_return_if_fail (CLUTTER_VALUE_HOLDS_UNIT (value));
value->data[0].v_int = units;
}
/**
* clutter_value_get_unit:
* @value: a #GValue initialized to #CLUTTER_TYPE_UNIT
*
* Gets the #ClutterUnit<!-- -->s contained in @value.
*
* Return value: the units inside the passed #GValue
*
* Since: 0.8
*/
ClutterUnit
cluttter_value_get_unit (const GValue *value)
{
g_return_val_if_fail (CLUTTER_VALUE_HOLDS_UNIT (value), 0);
return value->data[0].v_int;
}
static void
param_unit_init (GParamSpec *pspec)
{
ClutterParamSpecUnit *uspec = CLUTTER_PARAM_SPEC_UNIT (pspec);
uspec->minimum = -G_MAXINT32;
uspec->maximum = G_MAXINT32;
uspec->default_value = 0;
}
static void
param_unit_set_default (GParamSpec *pspec,
GValue *value)
{
value->data[0].v_int = CLUTTER_PARAM_SPEC_UNIT (pspec)->default_value;
}
static gboolean
param_unit_validate (GParamSpec *pspec,
GValue *value)
{
ClutterParamSpecUnit *uspec = CLUTTER_PARAM_SPEC_UNIT (pspec);
gint oval = value->data[0].v_int;
value->data[0].v_int = CLAMP (value->data[0].v_int,
uspec->minimum,
uspec->maximum);
return value->data[0].v_int != oval;
}
static gint
param_unit_values_cmp (GParamSpec *pspec,
const GValue *value1,
const GValue *value2)
{
if (value1->data[0].v_int < value2->data[0].v_int)
return -1;
else
return value1->data[0].v_int > value2->data[0].v_int;
}
GType
clutter_param_unit_get_type (void)
{
static GType pspec_type = 0;
if (G_UNLIKELY (pspec_type == 0))
{
const GParamSpecTypeInfo pspec_info = {
sizeof (ClutterParamSpecUnit),
16,
param_unit_init,
CLUTTER_TYPE_UNIT,
NULL,
param_unit_set_default,
param_unit_validate,
param_unit_values_cmp,
};
pspec_type = g_param_type_register_static (I_("ClutterParamSpecUnit"),
&pspec_info);
}
return pspec_type;
}
/**
* clutter_param_spec_unit:
* @name: name of the property
* @nick: short name
* @blurb: description (can be translatable)
* @minimum: lower boundary
* @maximum: higher boundary
* @default_value: default value
* @flags: flags for the param spec
*
* Creates a #GParamSpec for properties using #ClutterUnit<!-- -->s.
*
* Return value: the newly created #GParamSpec
*
* Since: 0.8
*/
GParamSpec *
clutter_param_spec_unit (const gchar *name,
const gchar *nick,
const gchar *blurb,
ClutterUnit minimum,
ClutterUnit maximum,
ClutterUnit default_value,
GParamFlags flags)
{
ClutterParamSpecUnit *uspec;
g_return_val_if_fail (default_value >= minimum && default_value <= maximum,
NULL);
uspec = g_param_spec_internal (CLUTTER_TYPE_PARAM_UNIT,
name, nick, blurb,
flags);
uspec->minimum = minimum;
uspec->maximum = maximum;
uspec->default_value = default_value;
return G_PARAM_SPEC (uspec);
}

74
clutter/clutter-units.h
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@ -24,29 +24,10 @@
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:clutter-units
* @short_description: A logical distance unit.
*
* Clutter units are logical units with granularity greater than that of the
* device units; they are used by #ClutterActorBox and the _units() family of
* ClutterActor functions. To convert between clutter units and device units,
* use #CLUTTER_UNITS_FROM_DEVICE and #CLUTTER_UNITS_TO_DEVICE macros.
*
* Note: It is expected that as of version 0.6 all dimensions in the public
* Clutter API will be given in clutter units. In order to ease the transition,
* two extra macros have been provided, #CLUTTER_UNITS_TMP_TO_DEVICE and
* #CLUTTER_UNITS_TMP_FROM_DEVICE. In version 0.4 these are identity macros,
* but when the API transition happens will map to #CLUTTER_UNITS_TO_DEVICE and
* #CLUTTER_UNITS_FROM_DEVICE respectively. You can use these in newly written
* code as place holders.
*
* Since: 0.4
*/
#ifndef _HAVE_CLUTTER_UNITS_H
#define _HAVE_CLUTTER_UNITS_H
#include <glib-object.h>
#include <clutter/clutter-fixed.h>
G_BEGIN_DECLS
@ -159,6 +140,59 @@ typedef gint32 ClutterUnit;
#define CLUTTER_UNITS_FROM_POINTSX(x) \
(CFX_MUL ((x), clutter_stage_get_resolutionx ((ClutterStage *) clutter_stage_get_default ())) / 72)
#define CLUTTER_TYPE_UNIT (clutter_unit_get_type ())
#define CLUTTER_TYPE_PARAM_UNIT (clutter_param_unit_get_type ())
#define CLUTTER_PARAM_SPEC_UNIT(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), CLUTTER_TYPE_PARAM_UNIT, ClutterParamSpecUnit))
#define CLUTTER_IS_PARAM_SPEC_UNIT(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), CLUTTER_TYPE_PARAM_UNIT))
/**
* CLUTTER_VALUE_HOLDS_UNIT:
* @x: a #GValue
*
* Evaluates to %TRUE if @x holds #ClutterUnit<!-- -->s.
*
* Since: 0.8
*/
#define CLUTTER_VALUE_HOLDS_UNIT(x) (G_VALUE_HOLDS ((x), CLUTTER_TYPE_UNIT))
typedef struct _ClutterParamSpecUnit ClutterParamSpecUnit;
/**
* ClutterParamSpecUnit:
* @minimum: lower boundary
* @maximum: higher boundary
* @default_value: default value
*
* #GParamSpec subclass for unit based properties.
*
* Since: 0.8
*/
struct _ClutterParamSpecUnit
{
/*< private >*/
GParamSpec parent_instance;
/*< public >*/
ClutterUnit minimum;
ClutterUnit maximum;
ClutterUnit default_value;
};
GType clutter_unit_get_type (void) G_GNUC_CONST;
GType clutter_param_unit_get_type (void) G_GNUC_CONST;
void clutter_value_set_unit (GValue *value,
ClutterUnit units);
ClutterUnit clutter_value_get_unit (const GValue *value);
GParamSpec *clutter_param_spec_unit (const gchar *name,
const gchar *nick,
const gchar *blurb,
ClutterUnit minimum,
ClutterUnit maximum,
ClutterUnit default_value,
GParamFlags flags);
G_END_DECLS
#endif /* _HAVE_CLUTTER_UNITS_H */

20
doc/reference/clutter-sections.txt
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@ -28,14 +28,15 @@ clutter_media_get_type
<FILE>clutter-units</FILE>
<TITLE>Unit conversion</TITLE>
ClutterUnit
CLUTTER_UNITS_FROM_DEVICE
CLUTTER_UNITS_TO_DEVICE
CLUTTER_UNITS_FROM_FIXED
CLUTTER_UNITS_TO_FIXED
CLUTTER_UNITS_FROM_FLOAT
CLUTTER_UNITS_TO_FLOAT
CLUTTER_UNITS_FROM_INT
CLUTTER_UNITS_TO_INT
<SUBSECTION>
CLUTTER_UNITS_FROM_DEVICE
CLUTTER_UNITS_TO_DEVICE
CLUTTER_UNITS_FROM_PANGO_UNIT
CLUTTER_UNITS_TO_PANGO_UNIT
CLUTTER_UNITS_TMP_FROM_DEVICE
@ -48,6 +49,21 @@ CLUTTER_UNITS_FROM_MM
CLUTTER_UNITS_FROM_MMX
CLUTTER_UNITS_FROM_POINTS
CLUTTER_UNITS_FROM_POINTSX
<SUBSECTION>
CLUTTER_VALUE_HOLDS_UNIT
clutter_value_set_unit
clutter_value_get_unit
<SUBSECTION>
ClutterParamSpecUnit
clutter_param_spec_unit
<SUBSECTION Standard>
CLUTTER_TYPE_UNIT
CLUTTER_TYPE_PARAM_UNIT
CLUTTER_PARAM_SPEC_UNIT
CLUTTER_IS_PARAM_SPEC_UNIT
<SUBSECTION Private>
clutter_unit_get_type
clutter_param_unit_get_type
</SECTION>
<SECTION>