mutter/clutter/clutter-units.h

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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.h"
#endif
#ifndef __CLUTTER_UNITS_H__
#define __CLUTTER_UNITS_H__
#include <glib-object.h>
#include <clutter/clutter-fixed.h>
G_BEGIN_DECLS
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/**
* ClutterUnit:
*
* Device independent unit used by Clutter. The value held can be transformed
* into other units, likes pixels.
*
* Since: 0.4
*/
typedef float ClutterUnit;
#define CLUTTER_UNITS_FROM_INT(x) ((float)(x))
#define CLUTTER_UNITS_TO_INT(x) ((int)(x))
#define CLUTTER_UNITS_FROM_FLOAT(x) (x)
#define CLUTTER_UNITS_TO_FLOAT(x) (x)
#define CLUTTER_UNITS_FROM_FIXED(x) (x)
#define CLUTTER_UNITS_TO_FIXED(x) (x)
/**
* CLUTTER_UNITS_FORMAT:
*
* Format string that should be used for scanning and printing units.
* It is a string literal, but it does not include the percent sign to
* allow precision and length modifiers between the percent sign and
* the format:
*
* |[
* g_print ("%" CLUTTER_UNITS_FORMAT, units);
* ]|
*
* Since: 1.0
*/
#define CLUTTER_UNITS_FORMAT "f"
/**
* CLUTTER_UNITS_FROM_DEVICE:
* @x: value in pixels
*
* Converts @x from pixels to #ClutterUnit<!-- -->s
*
* Since: 0.6
*/
#define CLUTTER_UNITS_FROM_DEVICE(x) CLUTTER_UNITS_FROM_INT ((x))
/**
* CLUTTER_UNITS_TO_DEVICE:
* @x: value in #ClutterUnit<!-- -->s
*
* Converts @x from #ClutterUnit<!-- -->s to pixels
*
* Since: 0.6
*/
#define CLUTTER_UNITS_TO_DEVICE(x) CLUTTER_UNITS_TO_INT ((x))
/**
* CLUTTER_UNITS_FROM_PANGO_UNIT:
* @x: value in Pango units
*
* Converts a value in Pango units to #ClutterUnit<!-- -->s
*
* Since: 0.6
*/
#define CLUTTER_UNITS_FROM_PANGO_UNIT(x) ((float)((x) / 1024))
/**
* CLUTTER_UNITS_TO_PANGO_UNIT:
* @x: value in #ClutterUnit<!-- -->s
*
* Converts a value in #ClutterUnit<!-- -->s to Pango units
*
* Since: 0.6
*/
#define CLUTTER_UNITS_TO_PANGO_UNIT(x) ((int)((x) * 1024))
/**
* CLUTTER_UNITS_FROM_MM:
* @x: a value in millimeters
*
* Converts a value in millimeters into #ClutterUnit<!-- -->s
*
* Since: 0.6
*/
#define CLUTTER_UNITS_FROM_MM(x) (clutter_units_mm (x))
/**
* CLUTTER_UNITS_FROM_POINTS:
* @x: a value in typographic points
*
* Converts a value in typographic points into #ClutterUnit<!-- -->s
*
* Since: 0.6
*/
#define CLUTTER_UNITS_FROM_POINTS(x) (clutter_units_pt (x))
/**
* CLUTTER_UNITS_FROM_EM:
* @x: a value in em
*
* Converts a value in em into #ClutterUnit<!-- -->s
*
* Since: 1.0
*/
#define CLUTTER_UNITS_FROM_EM(x) (clutter_units_em (x))
ClutterUnit clutter_units_mm (gdouble mm);
ClutterUnit clutter_units_pt (gdouble pt);
ClutterUnit clutter_units_em (gdouble em);
#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_MAXUNIT:
*
* Higher boundary for a #ClutterUnit
*
* Since: 0.8
*/
#define CLUTTER_MAXUNIT (G_MAXFLOAT)
/**
* CLUTTER_MINUNIT:
*
* Lower boundary for a #ClutterUnit
*
* Since: 0.8
*/
#define CLUTTER_MINUNIT (-G_MAXFLOAT)
/**
* 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 /* __CLUTTER_UNITS_H__ */