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a2cf7e4a19
To deal with all the corner cases that couldn't be scripted a number of patches were written for the remaining 10% of the effort. Note: again no API changes were made in Clutter, only in Cogl.
369 lines
9.8 KiB
C
369 lines
9.8 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By Tomas Frydrych <tf@openedhand.com>
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*
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* Copyright (C) 2006, 2007 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#define G_IMPLEMENT_INLINES
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <glib-object.h>
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#include <gobject/gvaluecollector.h>
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#include "clutter-fixed.h"
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#include "clutter-private.h"
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/**
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* SECTION:clutter-fixed
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* @short_description: Fixed Point API
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*
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* Clutter has a fixed point API targeted at platforms without a
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* floating point unit, such as embedded devices. On such platforms
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* this API should be preferred to the floating point one as it does
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* not trigger the slow path of software emulation, relying on integer
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* math for fixed-to-floating and floating-to-fixed conversion.
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*
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* It is no recommened for use on platforms with a floating point unit
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* (eg desktop systems) nor for use in bindings.
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*
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* Basic rules of Fixed Point arithmethic:
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*
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* <itemizedlist>
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* <listitem>
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* <para>Two fixed point numbers can be directly added,
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* subtracted and have their modulus taken.</para>
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* </listitem>
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* <listitem>
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* <para>To add other numerical type to a fixed point number it has to
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* be first converted to fixed point.</para>
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* </listitem>
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* <listitem>
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* <para>A fixed point number can be directly multiplied or divided by
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* an integer.</para>
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* </listitem>
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* <listitem>
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* <para>Two fixed point numbers can only be multiplied and divided by the
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* provided %CLUTTER_FIXED_MUL and %CLUTTER_FIXED_DIV macros.</para>
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* </listitem>
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* </itemizedlist>
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*/
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static GTypeInfo _info = {
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0,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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0,
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0,
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NULL,
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NULL,
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};
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static GTypeFundamentalInfo _finfo = { 0, };
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static void
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clutter_value_init_fixed (GValue *value)
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{
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value->data[0].v_int = 0;
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}
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static void
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clutter_value_copy_fixed (const GValue *src,
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GValue *dest)
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{
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dest->data[0].v_int = src->data[0].v_int;
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}
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static gchar *
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clutter_value_collect_fixed (GValue *value,
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guint n_collect_values,
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GTypeCValue *collect_values,
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guint collect_flags)
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{
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value->data[0].v_int = collect_values[0].v_int;
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return NULL;
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}
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static gchar *
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clutter_value_lcopy_fixed (const GValue *value,
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guint n_collect_values,
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GTypeCValue *collect_values,
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guint collect_flags)
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{
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gint32 *fixed_p = collect_values[0].v_pointer;
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if (!fixed_p)
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return g_strdup_printf ("value location for `%s' passed as NULL",
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G_VALUE_TYPE_NAME (value));
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*fixed_p = value->data[0].v_int;
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return NULL;
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}
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static void
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clutter_value_transform_fixed_int (const GValue *src,
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GValue *dest)
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{
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dest->data[0].v_int = (src->data[0].v_int);
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}
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static void
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clutter_value_transform_fixed_double (const GValue *src,
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GValue *dest)
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{
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dest->data[0].v_double = CLUTTER_FIXED_TO_DOUBLE (src->data[0].v_int);
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}
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static void
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clutter_value_transform_fixed_float (const GValue *src,
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GValue *dest)
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{
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dest->data[0].v_float = CLUTTER_FIXED_TO_FLOAT (src->data[0].v_int);
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}
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static void
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clutter_value_transform_int_fixed (const GValue *src,
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GValue *dest)
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{
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dest->data[0].v_int = (float)(src->data[0].v_int);
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}
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static void
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clutter_value_transform_double_fixed (const GValue *src,
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GValue *dest)
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{
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dest->data[0].v_int = CLUTTER_FLOAT_TO_FIXED (src->data[0].v_double);
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}
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static void
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clutter_value_transform_float_fixed (const GValue *src,
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GValue *dest)
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{
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dest->data[0].v_int = CLUTTER_FLOAT_TO_FIXED (src->data[0].v_float);
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}
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static const GTypeValueTable _clutter_fixed_value_table = {
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clutter_value_init_fixed,
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NULL,
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clutter_value_copy_fixed,
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NULL,
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"i",
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clutter_value_collect_fixed,
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"p",
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clutter_value_lcopy_fixed
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};
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GType
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clutter_fixed_get_type (void)
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{
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static GType _clutter_fixed_type = 0;
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if (G_UNLIKELY (_clutter_fixed_type == 0))
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{
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_info.value_table = & _clutter_fixed_value_table;
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_clutter_fixed_type =
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g_type_register_fundamental (g_type_fundamental_next (),
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I_("ClutterFixed"),
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&_info, &_finfo, 0);
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g_value_register_transform_func (_clutter_fixed_type, G_TYPE_INT,
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clutter_value_transform_fixed_int);
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g_value_register_transform_func (G_TYPE_INT, _clutter_fixed_type,
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clutter_value_transform_int_fixed);
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g_value_register_transform_func (_clutter_fixed_type, G_TYPE_FLOAT,
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clutter_value_transform_fixed_float);
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g_value_register_transform_func (G_TYPE_FLOAT, _clutter_fixed_type,
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clutter_value_transform_float_fixed);
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g_value_register_transform_func (_clutter_fixed_type, G_TYPE_DOUBLE,
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clutter_value_transform_fixed_double);
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g_value_register_transform_func (G_TYPE_DOUBLE, _clutter_fixed_type,
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clutter_value_transform_double_fixed);
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}
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return _clutter_fixed_type;
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}
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/**
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* clutter_value_set_fixed:
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* @value: a #GValue initialized to #CLUTTER_TYPE_FIXED
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* @fixed_: the fixed point value to set
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*
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* Sets @value to @fixed_.
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*
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* Since: 0.8
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*/
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void
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clutter_value_set_fixed (GValue *value,
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ClutterFixed fixed_)
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{
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g_return_if_fail (CLUTTER_VALUE_HOLDS_FIXED (value));
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value->data[0].v_int = fixed_;
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}
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/**
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* clutter_value_get_fixed:
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* @value: a #GValue initialized to #CLUTTER_TYPE_FIXED
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*
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* Gets the fixed point value stored inside @value.
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*
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* Return value: the value inside the passed #GValue
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*
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* Since: 0.8
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*/
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ClutterFixed
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clutter_value_get_fixed (const GValue *value)
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{
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g_return_val_if_fail (CLUTTER_VALUE_HOLDS_FIXED (value), 0);
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return value->data[0].v_int;
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}
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static void
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param_fixed_init (GParamSpec *pspec)
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{
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ClutterParamSpecFixed *fspec = CLUTTER_PARAM_SPEC_FIXED (pspec);
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fspec->minimum = CLUTTER_MAXFIXED;
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fspec->maximum = CLUTTER_MINFIXED;
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fspec->default_value = 0;
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}
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static void
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param_fixed_set_default (GParamSpec *pspec,
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GValue *value)
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{
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value->data[0].v_int = CLUTTER_PARAM_SPEC_FIXED (pspec)->default_value;
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}
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static gboolean
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param_fixed_validate (GParamSpec *pspec,
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GValue *value)
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{
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ClutterParamSpecFixed *fspec = CLUTTER_PARAM_SPEC_FIXED (pspec);
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gint oval = (value->data[0].v_int);
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gint min, max, val;
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g_assert (CLUTTER_IS_PARAM_SPEC_FIXED (pspec));
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/* we compare the integer part of the value because the minimum
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* and maximum values cover just that part of the representation
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*/
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min = fspec->minimum;
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max = fspec->maximum;
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val = (value->data[0].v_int);
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val = CLAMP (val, min, max);
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if (val != oval)
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{
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value->data[0].v_int = val;
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return TRUE;
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}
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return FALSE;
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}
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static gint
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param_fixed_values_cmp (GParamSpec *pspec,
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const GValue *value1,
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const GValue *value2)
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{
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if (value1->data[0].v_int < value2->data[0].v_int)
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return -1;
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else
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return value1->data[0].v_int > value2->data[0].v_int;
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}
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GType
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clutter_param_fixed_get_type (void)
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{
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static GType pspec_type = 0;
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if (G_UNLIKELY (pspec_type == 0))
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{
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const GParamSpecTypeInfo pspec_info = {
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sizeof (ClutterParamSpecFixed),
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16,
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param_fixed_init,
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CLUTTER_TYPE_FIXED,
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NULL,
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param_fixed_set_default,
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param_fixed_validate,
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param_fixed_values_cmp,
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};
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pspec_type = g_param_type_register_static (I_("ClutterParamSpecFixed"),
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&pspec_info);
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}
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return pspec_type;
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}
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/**
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* clutter_param_spec_fixed:
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* @name: name of the property
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* @nick: short name
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* @blurb: description (can be translatable)
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* @minimum: lower boundary
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* @maximum: higher boundary
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* @default_value: default value
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* @flags: flags for the param spec
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*
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* Creates a #GParamSpec for properties using #ClutterFixed values
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*
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* Return value: the newly created #GParamSpec
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*
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* Since: 0.8
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*/
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GParamSpec *
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clutter_param_spec_fixed (const gchar *name,
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const gchar *nick,
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const gchar *blurb,
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ClutterFixed minimum,
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ClutterFixed maximum,
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ClutterFixed default_value,
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GParamFlags flags)
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{
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ClutterParamSpecFixed *fspec;
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g_return_val_if_fail (default_value >= minimum && default_value <= maximum,
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NULL);
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fspec = g_param_spec_internal (CLUTTER_TYPE_PARAM_FIXED,
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name, nick, blurb,
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flags);
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fspec->minimum = minimum;
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fspec->maximum = maximum;
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fspec->default_value = default_value;
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return G_PARAM_SPEC (fspec);
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}
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