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mutter-performance-source/clutter/clutter-page-turn-effect.c
Emmanuele Bassi 77ec8774a0 WARNING: Massive revert commit 
Revert all the work that happened on the master branch.

Sadly, this is the only way to merge the current development branch back
into master.

It is now abundantly clear that I merged the 1.99 branch far too soon,
and that Clutter 2.0 won't happen any time soon, if at all.

Since having the development happen on a separate branch throws a lot of
people into confusion, let's undo the clutter-1.99 → master merge, and
move back the development of Clutter to the master branch.

In order to do so, we need to do some surgery to the Git repository.

First, we do a massive revert in a single commit of all that happened
since the switch to 1.99 and the API version bump done with the
89a2862b05 commit. The history is too long
to be reverted commit by commit without being extremely messy.
2015-01-03 20:34:20 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2010 Intel Corporation.
*
* 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/>.
*
* Author:
* Emmanuele Bassi <ebassi@linux.intel.com>
*
* Based on MxDeformPageTurn, written by:
* Chris Lord <chris@linux.intel.com>
*/
/**
* SECTION:clutter-page-turn-effect
* @Title: ClutterPageTurnEffect
* @Short_Description: A page turning effect
*
* A simple page turning effect
*
* #ClutterPageTurnEffect is available since Clutter 1.4
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include "clutter-page-turn-effect.h"
#include "clutter-debug.h"
#include "clutter-private.h"
#define CLUTTER_PAGE_TURN_EFFECT_CLASS(k) (G_TYPE_CHECK_CLASS_CAST ((k), CLUTTER_TYPE_PAGE_TURN_EFFECT, ClutterPageTurnEffectClass))
#define CLUTTER_IS_PAGE_TURN_EFFECT_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), CLUTTER_TYPE_PAGE_TURN_EFFECT))
#define CLUTTER_PAGE_TURN_EFFECT_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), CLUTTER_TYPE_PAGE_TURN_EFFECT, ClutterPageTurnEffectClass))
struct _ClutterPageTurnEffect
{
ClutterDeformEffect parent_instance;
gdouble period;
gdouble angle;
gfloat radius;
};
struct _ClutterPageTurnEffectClass
{
ClutterDeformEffectClass parent_class;
};
enum
{
PROP_0,
PROP_PERIOD,
PROP_ANGLE,
PROP_RADIUS,
PROP_LAST
};
static GParamSpec *obj_props[PROP_LAST];
G_DEFINE_TYPE (ClutterPageTurnEffect,
clutter_page_turn_effect,
CLUTTER_TYPE_DEFORM_EFFECT);
static void
clutter_page_turn_effect_deform_vertex (ClutterDeformEffect *effect,
gfloat width,
gfloat height,
CoglTextureVertex *vertex)
{
ClutterPageTurnEffect *self = CLUTTER_PAGE_TURN_EFFECT (effect);
gfloat cx, cy, rx, ry, radians, turn_angle;
guint shade;
if (self->period == 0.0)
return;
radians = self->angle / (180.0f / G_PI);
/* Rotate the point around the centre of the page-curl ray to align it with
* the y-axis.
*/
cx = (1.f - self->period) * width;
cy = (1.f - self->period) * height;
rx = ((vertex->x - cx) * cos (- radians))
- ((vertex->y - cy) * sin (- radians))
- self->radius;
ry = ((vertex->x - cx) * sin (- radians))
+ ((vertex->y - cy) * cos (- radians));
turn_angle = 0.f;
if (rx > self->radius * -2.0f)
{
/* Calculate the curl angle as a function from the distance of the curl
* ray (i.e. the page crease)
*/
turn_angle = (rx / self->radius * G_PI_2) - G_PI_2;
shade = (sin (turn_angle) * 96.0f) + 159.0f;
/* Add a gradient that makes it look like lighting and hides the switch
* between textures.
*/
cogl_color_init_from_4ub (&vertex->color, shade, shade, shade, 0xff);
}
if (rx > 0)
{
/* Make the curl radius smaller as more circles are formed (stops
* z-fighting and looks cool). Note that 10 is a semi-arbitrary
* number here - divide it by two and it's the amount of space
* between curled layers of the texture, in pixels.
*/
gfloat small_radius;
small_radius = self->radius
- MIN (self->radius, (turn_angle * 10) / G_PI);
/* Calculate a point on a cylinder (maybe make this a cone at some
* point) and rotate it by the specified angle.
*/
rx = (small_radius * cos (turn_angle)) + self->radius;
vertex->x = (rx * cos (radians)) - (ry * sin (radians)) + cx;
vertex->y = (rx * sin (radians)) + (ry * cos (radians)) + cy;
vertex->z = (small_radius * sin (turn_angle)) + self->radius;
}
}
static void
clutter_page_turn_effect_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterPageTurnEffect *effect = CLUTTER_PAGE_TURN_EFFECT (gobject);
switch (prop_id)
{
case PROP_PERIOD:
clutter_page_turn_effect_set_period (effect, g_value_get_double (value));
break;
case PROP_ANGLE:
clutter_page_turn_effect_set_angle (effect, g_value_get_double (value));
break;
case PROP_RADIUS:
clutter_page_turn_effect_set_radius (effect, g_value_get_float (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_page_turn_effect_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterPageTurnEffect *effect = CLUTTER_PAGE_TURN_EFFECT (gobject);
switch (prop_id)
{
case PROP_PERIOD:
g_value_set_double (value, effect->period);
break;
case PROP_ANGLE:
g_value_set_double (value, effect->angle);
break;
case PROP_RADIUS:
g_value_set_float (value, effect->radius);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_page_turn_effect_class_init (ClutterPageTurnEffectClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterDeformEffectClass *deform_class = CLUTTER_DEFORM_EFFECT_CLASS (klass);
GParamSpec *pspec;
gobject_class->set_property = clutter_page_turn_effect_set_property;
gobject_class->get_property = clutter_page_turn_effect_get_property;
/**
* ClutterPageTurnEffect:period:
*
* The period of the page turn, between 0.0 (no curling) and
* 1.0 (fully curled)
*
* Since: 1.4
*/
pspec = g_param_spec_double ("period",
"Period",
"The period of the page turn",
0.0, 1.0,
0.0,
CLUTTER_PARAM_READWRITE);
obj_props[PROP_PERIOD] = pspec;
g_object_class_install_property (gobject_class, PROP_PERIOD, pspec);
/**
* ClutterPageTurnEffect:angle:
*
* The angle of the page rotation, in degrees, between 0.0 and 360.0
*
* Since: 1.4
*/
pspec = g_param_spec_double ("angle",
"Angle",
"The angle of the page rotation, in degrees",
0.0, 360.0,
0.0,
CLUTTER_PARAM_READWRITE);
obj_props[PROP_ANGLE] = pspec;
g_object_class_install_property (gobject_class, PROP_ANGLE, pspec);
/**
* ClutterPageTurnEffect:radius:
*
* The radius of the page curl, in pixels
*
* Since: 1.4
*/
pspec = g_param_spec_float ("radius",
"Radius",
"The radius of the page curl",
-G_MAXFLOAT, G_MAXFLOAT,
24.0,
CLUTTER_PARAM_READWRITE);
obj_props[PROP_RADIUS] = pspec;
g_object_class_install_property (gobject_class, PROP_RADIUS, pspec);
deform_class->deform_vertex = clutter_page_turn_effect_deform_vertex;
}
static void
clutter_page_turn_effect_init (ClutterPageTurnEffect *self)
{
self->period = 0.0;
self->angle = 0.0;
self->radius = 24.0f;
}
/**
* clutter_page_turn_effect_new:
* @period: the period of the page curl, between 0.0 and 1.0
* @angle: the angle of the page curl, between 0.0 and 360.0
* @radius: the radius of the page curl, in pixels
*
* Creates a new #ClutterPageTurnEffect instance with the given parameters
*
* Return value: the newly created #ClutterPageTurnEffect
*
* Since: 1.4
*/
ClutterEffect *
clutter_page_turn_effect_new (gdouble period,
gdouble angle,
gfloat radius)
{
g_return_val_if_fail (period >= 0.0 && period <= 1.0, NULL);
g_return_val_if_fail (angle >= 0.0 && angle <= 360.0, NULL);
return g_object_new (CLUTTER_TYPE_PAGE_TURN_EFFECT,
"period", period,
"angle", angle,
"radius", radius,
NULL);
}
/**
* clutter_page_turn_effect_set_period:
* @effect: a #ClutterPageTurnEffect
* @period: the period of the page curl, between 0.0 and 1.0
*
* Sets the period of the page curling, between 0.0 (no curling)
* and 1.0 (fully curled)
*
* Since: 1.4
*/
void
clutter_page_turn_effect_set_period (ClutterPageTurnEffect *effect,
gdouble period)
{
g_return_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect));
g_return_if_fail (period >= 0.0 && period <= 1.0);
effect->period = period;
clutter_deform_effect_invalidate (CLUTTER_DEFORM_EFFECT (effect));
g_object_notify_by_pspec (G_OBJECT (effect), obj_props[PROP_PERIOD]);
}
/**
* clutter_page_turn_effect_get_period:
* @effect: a #ClutterPageTurnEffect
*
* Retrieves the value set using clutter_page_turn_effect_get_period()
*
* Return value: the period of the page curling
*
* Since: 1.4
*/
gdouble
clutter_page_turn_effect_get_period (ClutterPageTurnEffect *effect)
{
g_return_val_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect), 0.0);
return effect->period;
}
/**
* clutter_page_turn_effect_set_angle:
* @effect: #ClutterPageTurnEffect
* @angle: the angle of the page curl, in degrees
*
* Sets the angle of the page curling, in degrees
*
* Since: 1.4
*/
void
clutter_page_turn_effect_set_angle (ClutterPageTurnEffect *effect,
gdouble angle)
{
g_return_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect));
g_return_if_fail (angle >= 0.0 && angle <= 360.0);
effect->angle = angle;
clutter_deform_effect_invalidate (CLUTTER_DEFORM_EFFECT (effect));
g_object_notify_by_pspec (G_OBJECT (effect), obj_props[PROP_ANGLE]);
}
/**
* clutter_page_turn_effect_get_angle:
* @effect: a #ClutterPageTurnEffect:
*
* Retrieves the value set using clutter_page_turn_effect_get_angle()
*
* Return value: the angle of the page curling
*
* Since: 1.4
*/
gdouble
clutter_page_turn_effect_get_angle (ClutterPageTurnEffect *effect)
{
g_return_val_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect), 0.0);
return effect->angle;
}
/**
* clutter_page_turn_effect_set_radius:
* @effect: a #ClutterPageTurnEffect:
* @radius: the radius of the page curling, in pixels
*
* Sets the radius of the page curling
*
* Since: 1.4
*/
void
clutter_page_turn_effect_set_radius (ClutterPageTurnEffect *effect,
gfloat radius)
{
g_return_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect));
effect->radius = radius;
clutter_deform_effect_invalidate (CLUTTER_DEFORM_EFFECT (effect));
g_object_notify_by_pspec (G_OBJECT (effect), obj_props[PROP_RADIUS]);
}
/**
* clutter_page_turn_effect_get_radius:
* @effect: a #ClutterPageTurnEffect
*
* Retrieves the value set using clutter_page_turn_effect_set_radius()
*
* Return value: the radius of the page curling
*
* Since: 1.4
*/
gfloat
clutter_page_turn_effect_get_radius (ClutterPageTurnEffect *effect)
{
g_return_val_if_fail (CLUTTER_IS_PAGE_TURN_EFFECT (effect), 0.0);
return effect->radius;
}
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