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/* -*- mode:C; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By: Tomas Frydrych <tf@openedhand.com>
* Emmanuele Bassu <ebassi@linux.intel.com>
*
* Copyright (C) 2007, 2008 OpenedHand
* Copyright (C) 2009 Intel Corp.
*
* 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/>.
*/
#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
#error "Only <clutter/clutter.h> can be included directly."
#endif
#ifndef __CLUTTER_UNITS_H__
#define __CLUTTER_UNITS_H__
#include <glib-object.h>
#include <cogl/cogl.h>
G_BEGIN_DECLS
/**
* ClutterUnitType:
* @CLUTTER_UNIT_PIXEL: Unit expressed in pixels (with subpixel precision)
* @CLUTTER_UNIT_EM: Unit expressed in em
* @CLUTTER_UNIT_MM: Unit expressed in millimeters
* @CLUTTER_UNIT_POINT: Unit expressed in points
* @CLUTTER_UNIT_CM: Unit expressed in centimeters
*
* The type of unit in which a value is expressed
*
* This enumeration might be expanded at later date
*
* Since: 1.0
*/
typedef enum {
CLUTTER_UNIT_PIXEL,
CLUTTER_UNIT_EM,
CLUTTER_UNIT_MM,
CLUTTER_UNIT_POINT,
CLUTTER_UNIT_CM
} ClutterUnitType;
/**
* ClutterUnits:
*
* An opaque structure, to be used to store sizing and positioning
* values along with their unit.
*
* Since: 1.0
*/
typedef struct _ClutterUnits ClutterUnits;
struct _ClutterUnits
{
/*< private >*/
ClutterUnitType unit_type;
gfloat value;
/* pre-filled by the provided constructors */
/* cached pixel value */
gfloat pixels;
/* whether the :pixels field is set */
guint pixels_set;
/* the serial coming from the backend, used to evict the cache */
gint32 serial;
/* padding for eventual expansion */
gint32 __padding_1;
gint64 __padding_2;
};
GType clutter_units_get_type (void) G_GNUC_CONST;
ClutterUnitType clutter_units_get_unit_type (const ClutterUnits *units);
gfloat clutter_units_get_unit_value (const ClutterUnits *units);
ClutterUnits * clutter_units_copy (const ClutterUnits *units);
void clutter_units_free (ClutterUnits *units);
void clutter_units_from_pixels (ClutterUnits *units,
gint px);
void clutter_units_from_em (ClutterUnits *units,
gfloat em);
void clutter_units_from_em_for_font (ClutterUnits *units,
const gchar *font_name,
gfloat em);
void clutter_units_from_mm (ClutterUnits *units,
gfloat mm);
void clutter_units_from_cm (ClutterUnits *units,
gfloat cm);
void clutter_units_from_pt (ClutterUnits *units,
gfloat pt);
gfloat clutter_units_to_pixels (ClutterUnits *units);
gboolean clutter_units_from_string (ClutterUnits *units,
const gchar *str);
gchar * clutter_units_to_string (const ClutterUnits *units);
/* shorthands for the constructors */
#define clutter_units_pixels clutter_units_from_pixels
#define clutter_units_em clutter_units_from_em
#define clutter_units_em_for_font clutter_units_from_em_for_font
#define clutter_units_mm clutter_units_from_mm
#define clutter_units_cm clutter_units_from_cm
#define clutter_units_pt clutter_units_from_pt
#define CLUTTER_TYPE_UNITS (clutter_units_get_type ())
#define CLUTTER_TYPE_PARAM_UNITS (clutter_param_units_get_type ())
#define CLUTTER_PARAM_SPEC_UNITS(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), CLUTTER_TYPE_PARAM_UNITS, ClutterParamSpecUnits))
#define CLUTTER_IS_PARAM_SPEC_UNITS(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), CLUTTER_TYPE_PARAM_UNITS))
/**
* CLUTTER_VALUE_HOLDS_UNITS:
* @x: a #GValue
*
* Evaluates to %TRUE if @x holds a #ClutterUnits value
*
* Since: 0.8
*/
#define CLUTTER_VALUE_HOLDS_UNITS(x) (G_VALUE_HOLDS ((x), CLUTTER_TYPE_UNITS))
typedef struct _ClutterParamSpecUnits ClutterParamSpecUnits;
/**
* ClutterParamSpecUnits: (skip)
* @default_type: default type
* @default_value: default value
* @minimum: lower boundary
* @maximum: higher boundary
*
* #GParamSpec subclass for unit based properties.
*
* Since: 1.0
*/
struct _ClutterParamSpecUnits
{
/*< private >*/
GParamSpec parent_instance;
/*< public >*/
ClutterUnitType default_type;
gfloat default_value;
gfloat minimum;
gfloat maximum;
};
GType clutter_param_units_get_type (void) G_GNUC_CONST;
GParamSpec * clutter_param_spec_units (const gchar *name,
const gchar *nick,
const gchar *blurb,
ClutterUnitType default_type,
gfloat minimum,
gfloat maximum,
gfloat default_value,
GParamFlags flags);
void clutter_value_set_units (GValue *value,
const ClutterUnits *units);
const ClutterUnits * clutter_value_get_units (const GValue *value);
G_END_DECLS
#endif /* __CLUTTER_UNITS_H__ */
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