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22ce4409b3
Interpolating between two transformations expressed using a 3D matrix can be achieved by decomposing the matrices into their transformations and do a simple numeric interpolation between the initial and final states, like we do for other data types. Luckily for us, the CSS Transforms specification from the W3C provides the decomposition algorithm, using the "unmatrix" code taken from the book "Graphics Gems II, edited by Jim Arvo". Once the matrices have been decomposed, we can simply interpolate the transformations, and re-apply them onto the result matrix, using the facilities that Clutter provides for interpolating between two known GTypes.
1467 lines
35 KiB
C
1467 lines
35 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 Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2006 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, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* SECTION:clutter-geometric-types
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* @Title: Base geometric types
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* @Short_Description: Common geometric data types used by Clutter
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*
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* Clutter defines a set of geometric data structures that are commonly used
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* across the whole API.
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*/
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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 "clutter-types.h"
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#include "clutter-private.h"
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#include <math.h>
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#define FLOAT_EPSILON (1e-15)
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/*
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* ClutterGeometry
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*/
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static ClutterGeometry*
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clutter_geometry_copy (const ClutterGeometry *geometry)
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{
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return g_slice_dup (ClutterGeometry, geometry);
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}
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static void
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clutter_geometry_free (ClutterGeometry *geometry)
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{
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if (G_LIKELY (geometry != NULL))
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g_slice_free (ClutterGeometry, geometry);
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}
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/**
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* clutter_geometry_union:
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* @geometry_a: a #ClutterGeometry
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* @geometry_b: another #ClutterGeometry
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* @result: (out): location to store the result
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*
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* Find the union of two rectangles represented as #ClutterGeometry.
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*
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* Since: 1.4
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*/
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void
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clutter_geometry_union (const ClutterGeometry *geometry_a,
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const ClutterGeometry *geometry_b,
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ClutterGeometry *result)
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{
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/* We don't try to handle rectangles that can't be represented
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* as a signed integer box */
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gint x_1 = MIN (geometry_a->x, geometry_b->x);
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gint y_1 = MIN (geometry_a->y, geometry_b->y);
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gint x_2 = MAX (geometry_a->x + (gint)geometry_a->width,
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geometry_b->x + (gint)geometry_b->width);
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gint y_2 = MAX (geometry_a->y + (gint)geometry_a->height,
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geometry_b->y + (gint)geometry_b->height);
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result->x = x_1;
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result->y = y_1;
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result->width = x_2 - x_1;
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result->height = y_2 - y_1;
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}
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/**
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* clutter_geometry_intersects:
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* @geometry0: The first geometry to test
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* @geometry1: The second geometry to test
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*
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* Determines if @geometry0 and geometry1 intersect returning %TRUE if
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* they do else %FALSE.
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*
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* Return value: %TRUE of @geometry0 and geometry1 intersect else
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* %FALSE.
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*
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* Since: 1.4
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*/
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gboolean
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clutter_geometry_intersects (const ClutterGeometry *geometry0,
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const ClutterGeometry *geometry1)
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{
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if (geometry1->x >= (geometry0->x + (gint)geometry0->width) ||
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geometry1->y >= (geometry0->y + (gint)geometry0->height) ||
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(geometry1->x + (gint)geometry1->width) <= geometry0->x ||
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(geometry1->y + (gint)geometry1->height) <= geometry0->y)
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return FALSE;
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else
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return TRUE;
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}
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static gboolean
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clutter_geometry_progress (const GValue *a,
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const GValue *b,
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gdouble progress,
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GValue *retval)
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{
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const ClutterGeometry *a_geom = g_value_get_boxed (a);
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const ClutterGeometry *b_geom = g_value_get_boxed (b);
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ClutterGeometry res = { 0, };
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gint a_width = a_geom->width;
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gint b_width = b_geom->width;
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gint a_height = a_geom->height;
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gint b_height = b_geom->height;
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res.x = a_geom->x + (b_geom->x - a_geom->x) * progress;
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res.y = a_geom->y + (b_geom->y - a_geom->y) * progress;
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res.width = a_width + (b_width - a_width) * progress;
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res.height = a_height + (b_height - a_height) * progress;
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g_value_set_boxed (retval, &res);
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return TRUE;
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}
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G_DEFINE_BOXED_TYPE_WITH_CODE (ClutterGeometry, clutter_geometry,
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clutter_geometry_copy,
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clutter_geometry_free,
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CLUTTER_REGISTER_INTERVAL_PROGRESS (clutter_geometry_progress));
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/*
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* ClutterVertices
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*/
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/**
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* clutter_vertex_new:
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* @x: X coordinate
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* @y: Y coordinate
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* @z: Z coordinate
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*
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* Creates a new #ClutterVertex for the point in 3D space
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* identified by the 3 coordinates @x, @y, @z.
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*
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* This function is the logical equivalent of:
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*
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* |[
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* clutter_vertex_init (clutter_vertex_alloc (), x, y, z);
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* ]|
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*
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* Return value: (transfer full): the newly allocated #ClutterVertex.
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* Use clutter_vertex_free() to free the resources
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*
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* Since: 1.0
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*/
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ClutterVertex *
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clutter_vertex_new (gfloat x,
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gfloat y,
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gfloat z)
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{
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return clutter_vertex_init (clutter_vertex_alloc (), x, y, z);
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}
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/**
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* clutter_vertex_alloc: (constructor)
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*
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* Allocates a new, empty #ClutterVertex.
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*
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* Return value: (transfer full): the newly allocated #ClutterVertex.
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* Use clutter_vertex_free() to free its resources
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*
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* Since: 1.12
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*/
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ClutterVertex *
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clutter_vertex_alloc (void)
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{
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return g_slice_new0 (ClutterVertex);
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}
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/**
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* clutter_vertex_init:
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* @vertex: a #ClutterVertex
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* @x: X coordinate
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* @y: Y coordinate
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* @z: Z coordinate
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*
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* Initializes @vertex with the given coordinates.
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*
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* Return value: (transfer none): the initialized #ClutterVertex
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*
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* Since: 1.10
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*/
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ClutterVertex *
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clutter_vertex_init (ClutterVertex *vertex,
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gfloat x,
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gfloat y,
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gfloat z)
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{
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g_return_val_if_fail (vertex != NULL, NULL);
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vertex->x = x;
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vertex->y = y;
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vertex->z = z;
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return vertex;
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}
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/**
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* clutter_vertex_copy:
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* @vertex: a #ClutterVertex
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*
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* Copies @vertex
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*
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* Return value: (transfer full): a newly allocated copy of #ClutterVertex.
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* Use clutter_vertex_free() to free the allocated resources
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*
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* Since: 1.0
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*/
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ClutterVertex *
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clutter_vertex_copy (const ClutterVertex *vertex)
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{
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if (G_LIKELY (vertex != NULL))
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return g_slice_dup (ClutterVertex, vertex);
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return NULL;
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}
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/**
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* clutter_vertex_free:
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* @vertex: a #ClutterVertex
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*
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* Frees a #ClutterVertex allocated using clutter_vertex_alloc() or
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* clutter_vertex_copy().
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*
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* Since: 1.0
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*/
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void
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clutter_vertex_free (ClutterVertex *vertex)
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{
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if (G_UNLIKELY (vertex != NULL))
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g_slice_free (ClutterVertex, vertex);
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}
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/**
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* clutter_vertex_equal:
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* @vertex_a: a #ClutterVertex
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* @vertex_b: a #ClutterVertex
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*
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* Compares @vertex_a and @vertex_b for equality
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*
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* Return value: %TRUE if the passed #ClutterVertex are equal
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*
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* Since: 1.0
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*/
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gboolean
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clutter_vertex_equal (const ClutterVertex *vertex_a,
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const ClutterVertex *vertex_b)
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{
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g_return_val_if_fail (vertex_a != NULL && vertex_b != NULL, FALSE);
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if (vertex_a == vertex_b)
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return TRUE;
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return fabsf (vertex_a->x - vertex_b->x) < FLOAT_EPSILON &&
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fabsf (vertex_a->y - vertex_b->y) < FLOAT_EPSILON &&
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fabsf (vertex_a->z - vertex_b->z) < FLOAT_EPSILON;
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}
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static void
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clutter_vertex_interpolate (const ClutterVertex *a,
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const ClutterVertex *b,
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double progress,
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ClutterVertex *res)
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{
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res->x = a->x + (b->x - a->x) * progress;
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res->y = a->y + (b->y - a->y) * progress;
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res->z = a->z + (b->z - a->z) * progress;
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}
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static gboolean
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clutter_vertex_progress (const GValue *a,
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const GValue *b,
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gdouble progress,
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GValue *retval)
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{
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const ClutterVertex *av = g_value_get_boxed (a);
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const ClutterVertex *bv = g_value_get_boxed (b);
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ClutterVertex res;
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clutter_vertex_interpolate (av, bv, progress, &res);
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g_value_set_boxed (retval, &res);
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return TRUE;
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}
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G_DEFINE_BOXED_TYPE_WITH_CODE (ClutterVertex, clutter_vertex,
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clutter_vertex_copy,
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clutter_vertex_free,
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CLUTTER_REGISTER_INTERVAL_PROGRESS (clutter_vertex_progress));
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/*
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* ClutterMargin
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*/
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/**
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* clutter_margin_new:
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*
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* Creates a new #ClutterMargin.
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*
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* Return value: (transfer full): a newly allocated #ClutterMargin. Use
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* clutter_margin_free() to free the resources associated with it when
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* done.
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*
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* Since: 1.10
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*/
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ClutterMargin *
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clutter_margin_new (void)
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{
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return g_slice_new0 (ClutterMargin);
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}
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/**
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* clutter_margin_copy:
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* @margin_: a #ClutterMargin
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*
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* Creates a new #ClutterMargin and copies the contents of @margin_ into
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* the newly created structure.
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*
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* Return value: (transfer full): a copy of the #ClutterMargin.
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*
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* Since: 1.10
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*/
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ClutterMargin *
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clutter_margin_copy (const ClutterMargin *margin_)
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{
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if (G_LIKELY (margin_ != NULL))
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return g_slice_dup (ClutterMargin, margin_);
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return NULL;
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}
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/**
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* clutter_margin_free:
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* @margin_: a #ClutterMargin
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*
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* Frees the resources allocated by clutter_margin_new() and
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* clutter_margin_copy().
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*
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* Since: 1.10
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*/
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void
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clutter_margin_free (ClutterMargin *margin_)
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{
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if (G_LIKELY (margin_ != NULL))
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g_slice_free (ClutterMargin, margin_);
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}
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G_DEFINE_BOXED_TYPE (ClutterMargin, clutter_margin,
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clutter_margin_copy,
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clutter_margin_free)
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/*
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* ClutterPoint
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*/
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static const ClutterPoint _clutter_point_zero = CLUTTER_POINT_INIT_ZERO;
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/**
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* clutter_point_zero:
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*
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* A point centered at (0, 0).
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*
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* The returned value can be used as a guard.
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*
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* Return value: a point centered in (0, 0); the returned #ClutterPoint
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* is owned by Clutter and it should not be modified or freed.
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*
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* Since: 1.12
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*/
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const ClutterPoint *
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clutter_point_zero (void)
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{
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return &_clutter_point_zero;
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}
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/**
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* clutter_point_alloc: (constructor)
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||
*
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* Allocates a new #ClutterPoint.
|
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*
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* Return value: (transfer full): the newly allocated #ClutterPoint.
|
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* Use clutter_point_free() to free its resources.
|
||
*
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* Since: 1.12
|
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*/
|
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ClutterPoint *
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clutter_point_alloc (void)
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{
|
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return g_slice_new0 (ClutterPoint);
|
||
}
|
||
|
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/**
|
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* clutter_point_init:
|
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* @point: a #ClutterPoint
|
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* @x: the X coordinate of the point
|
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* @y: the Y coordinate of the point
|
||
*
|
||
* Initializes @point with the given coordinates.
|
||
*
|
||
* Return value: (transfer none): the initialized #ClutterPoint
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterPoint *
|
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clutter_point_init (ClutterPoint *point,
|
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float x,
|
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float y)
|
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{
|
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g_return_val_if_fail (point != NULL, NULL);
|
||
|
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point->x = x;
|
||
point->y = y;
|
||
|
||
return point;
|
||
}
|
||
|
||
/**
|
||
* clutter_point_copy:
|
||
* @point: a #ClutterPoint
|
||
*
|
||
* Creates a new #ClutterPoint with the same coordinates of @point.
|
||
*
|
||
* Return value: (transfer full): a newly allocated #ClutterPoint.
|
||
* Use clutter_point_free() to free its resources.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterPoint *
|
||
clutter_point_copy (const ClutterPoint *point)
|
||
{
|
||
return g_slice_dup (ClutterPoint, point);
|
||
}
|
||
|
||
/**
|
||
* clutter_point_free:
|
||
* @point: a #ClutterPoint
|
||
*
|
||
* Frees the resources allocated for @point.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
void
|
||
clutter_point_free (ClutterPoint *point)
|
||
{
|
||
if (point != NULL && point != &_clutter_point_zero)
|
||
g_slice_free (ClutterPoint, point);
|
||
}
|
||
|
||
/**
|
||
* clutter_point_equals:
|
||
* @a: the first #ClutterPoint to compare
|
||
* @b: the second #ClutterPoint to compare
|
||
*
|
||
* Compares two #ClutterPoint for equality.
|
||
*
|
||
* Return value: %TRUE if the #ClutterPoints are equal
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
gboolean
|
||
clutter_point_equals (const ClutterPoint *a,
|
||
const ClutterPoint *b)
|
||
{
|
||
if (a == b)
|
||
return TRUE;
|
||
|
||
if (a == NULL || b == NULL)
|
||
return FALSE;
|
||
|
||
return fabsf (a->x - b->x) < FLOAT_EPSILON &&
|
||
fabsf (a->y - b->y) < FLOAT_EPSILON;
|
||
}
|
||
|
||
/**
|
||
* clutter_point_distance:
|
||
* @a: a #ClutterPoint
|
||
* @b: a #ClutterPoint
|
||
* @x_distance: (out) (allow-none): return location for the horizontal
|
||
* distance between the points
|
||
* @y_distance: (out) (allow-none): return location for the vertical
|
||
* distance between the points
|
||
*
|
||
* Computes the distance between two #ClutterPoint.
|
||
*
|
||
* Return value: the distance between the points.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
float
|
||
clutter_point_distance (const ClutterPoint *a,
|
||
const ClutterPoint *b,
|
||
float *x_distance,
|
||
float *y_distance)
|
||
{
|
||
float x_d, y_d;
|
||
|
||
g_return_val_if_fail (a != NULL, 0.f);
|
||
g_return_val_if_fail (b != NULL, 0.f);
|
||
|
||
if (clutter_point_equals (a, b))
|
||
return 0.f;
|
||
|
||
x_d = (a->x - b->x);
|
||
y_d = (a->y - b->y);
|
||
|
||
if (x_distance != NULL)
|
||
*x_distance = fabsf (x_d);
|
||
|
||
if (y_distance != NULL)
|
||
*y_distance = fabsf (y_d);
|
||
|
||
return sqrt ((x_d * x_d) + (y_d * y_d));
|
||
}
|
||
|
||
static gboolean
|
||
clutter_point_progress (const GValue *a,
|
||
const GValue *b,
|
||
gdouble progress,
|
||
GValue *retval)
|
||
{
|
||
const ClutterPoint *ap = g_value_get_boxed (a);
|
||
const ClutterPoint *bp = g_value_get_boxed (b);
|
||
ClutterPoint res = CLUTTER_POINT_INIT (0, 0);
|
||
|
||
res.x = ap->x + (bp->x - ap->x) * progress;
|
||
res.y = ap->y + (bp->y - ap->y) * progress;
|
||
|
||
g_value_set_boxed (retval, &res);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
G_DEFINE_BOXED_TYPE_WITH_CODE (ClutterPoint, clutter_point,
|
||
clutter_point_copy,
|
||
clutter_point_free,
|
||
CLUTTER_REGISTER_INTERVAL_PROGRESS (clutter_point_progress))
|
||
|
||
|
||
|
||
/*
|
||
* ClutterSize
|
||
*/
|
||
|
||
/**
|
||
* clutter_size_alloc: (constructor)
|
||
*
|
||
* Allocates a new #ClutterSize.
|
||
*
|
||
* Return value: (transfer full): the newly allocated #ClutterSize.
|
||
* Use clutter_size_free() to free its resources.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterSize *
|
||
clutter_size_alloc (void)
|
||
{
|
||
return g_slice_new0 (ClutterSize);
|
||
}
|
||
|
||
/**
|
||
* clutter_size_init:
|
||
* @size: a #ClutterSize
|
||
* @width: the width
|
||
* @height: the height
|
||
*
|
||
* Initializes a #ClutterSize with the given dimensions.
|
||
*
|
||
* Return value: (transfer none): the initialized #ClutterSize
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterSize *
|
||
clutter_size_init (ClutterSize *size,
|
||
float width,
|
||
float height)
|
||
{
|
||
g_return_val_if_fail (size != NULL, NULL);
|
||
|
||
size->width = width;
|
||
size->height = height;
|
||
|
||
return size;
|
||
}
|
||
|
||
/**
|
||
* clutter_size_copy:
|
||
* @size: a #ClutterSize
|
||
*
|
||
* Creates a new #ClutterSize and duplicates @size.
|
||
*
|
||
* Return value: (transfer full): the newly allocated #ClutterSize.
|
||
* Use clutter_size_free() to free its resources.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterSize *
|
||
clutter_size_copy (const ClutterSize *size)
|
||
{
|
||
return g_slice_dup (ClutterSize, size);
|
||
}
|
||
|
||
/**
|
||
* clutter_size_free:
|
||
* @size: a #ClutterSize
|
||
*
|
||
* Frees the resources allocated for @size.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
void
|
||
clutter_size_free (ClutterSize *size)
|
||
{
|
||
if (size != NULL)
|
||
g_slice_free (ClutterSize, size);
|
||
}
|
||
|
||
/**
|
||
* clutter_size_equals:
|
||
* @a: a #ClutterSize to compare
|
||
* @b: a #ClutterSize to compare
|
||
*
|
||
* Compares two #ClutterSize for equality.
|
||
*
|
||
* Return value: %TRUE if the two #ClutterSize are equal
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
gboolean
|
||
clutter_size_equals (const ClutterSize *a,
|
||
const ClutterSize *b)
|
||
{
|
||
if (a == b)
|
||
return TRUE;
|
||
|
||
if (a == NULL || b == NULL)
|
||
return FALSE;
|
||
|
||
return fabsf (a->width - b->width) < FLOAT_EPSILON &&
|
||
fabsf (a->height - b->height) < FLOAT_EPSILON;
|
||
}
|
||
|
||
static gboolean
|
||
clutter_size_progress (const GValue *a,
|
||
const GValue *b,
|
||
gdouble progress,
|
||
GValue *retval)
|
||
{
|
||
const ClutterSize *as = g_value_get_boxed (a);
|
||
const ClutterSize *bs = g_value_get_boxed (b);
|
||
ClutterSize res = CLUTTER_SIZE_INIT (0, 0);
|
||
|
||
res.width = as->width + (bs->width - as->width) * progress;
|
||
res.height = as->height + (bs->height - as->height) * progress;
|
||
|
||
g_value_set_boxed (retval, &res);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
G_DEFINE_BOXED_TYPE_WITH_CODE (ClutterSize, clutter_size,
|
||
clutter_size_copy,
|
||
clutter_size_free,
|
||
CLUTTER_REGISTER_INTERVAL_PROGRESS (clutter_size_progress))
|
||
|
||
|
||
|
||
/*
|
||
* ClutterRect
|
||
*/
|
||
|
||
static const ClutterRect _clutter_rect_zero = CLUTTER_RECT_INIT_ZERO;
|
||
|
||
static gboolean clutter_rect_progress (const GValue *a,
|
||
const GValue *b,
|
||
gdouble progress,
|
||
GValue *res);
|
||
|
||
G_DEFINE_BOXED_TYPE_WITH_CODE (ClutterRect, clutter_rect,
|
||
clutter_rect_copy,
|
||
clutter_rect_free,
|
||
CLUTTER_REGISTER_INTERVAL_PROGRESS (clutter_rect_progress))
|
||
|
||
static inline void
|
||
clutter_rect_normalize_internal (ClutterRect *rect)
|
||
{
|
||
if (rect->size.width >= 0.f && rect->size.height >= 0.f)
|
||
return;
|
||
|
||
if (rect->size.width < 0.f)
|
||
{
|
||
float size = fabsf (rect->size.width);
|
||
|
||
rect->origin.x -= size;
|
||
rect->size.width = size;
|
||
}
|
||
|
||
if (rect->size.height < 0.f)
|
||
{
|
||
float size = fabsf (rect->size.height);
|
||
|
||
rect->origin.y -= size;
|
||
rect->size.height = size;
|
||
}
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_zero:
|
||
*
|
||
* A #ClutterRect with #ClutterRect.origin set at (0, 0) and a size
|
||
* of 0.
|
||
*
|
||
* The returned value can be used as a guard.
|
||
*
|
||
* Return value: a rectangle with origin in (0, 0) and a size of 0.
|
||
* The returned #ClutterRect is owned by Clutter and it should not
|
||
* be modified or freed.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
const ClutterRect *
|
||
clutter_rect_zero (void)
|
||
{
|
||
return &_clutter_rect_zero;
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_alloc: (constructor)
|
||
*
|
||
* Creates a new, empty #ClutterRect.
|
||
*
|
||
* You can use clutter_rect_init() to initialize the returned rectangle,
|
||
* for instance:
|
||
*
|
||
* |[
|
||
* rect = clutter_rect_init (clutter_rect_alloc (), x, y, width, height);
|
||
* ]|
|
||
*
|
||
* Return value: (transfer full): the newly allocated #ClutterRect.
|
||
* Use clutter_rect_free() to free its resources
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterRect *
|
||
clutter_rect_alloc (void)
|
||
{
|
||
return g_slice_new0 (ClutterRect);
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_init:
|
||
* @rect: a #ClutterRect
|
||
* @x: X coordinate of the origin
|
||
* @y: Y coordinate of the origin
|
||
* @width: width of the rectangle
|
||
* @height: height of the rectangle
|
||
*
|
||
* Initializes a #ClutterRect with the given origin and size.
|
||
*
|
||
* Return value: (transfer none): the updated rectangle
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterRect *
|
||
clutter_rect_init (ClutterRect *rect,
|
||
float x,
|
||
float y,
|
||
float width,
|
||
float height)
|
||
{
|
||
g_return_val_if_fail (rect != NULL, NULL);
|
||
|
||
rect->origin.x = x;
|
||
rect->origin.y = y;
|
||
|
||
rect->size.width = width;
|
||
rect->size.height = height;
|
||
|
||
return rect;
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_copy:
|
||
* @rect: a #ClutterRect
|
||
*
|
||
* Copies @rect into a new #ClutterRect instance.
|
||
*
|
||
* Return value: (transfer full): the newly allocate copy of @rect.
|
||
* Use clutter_rect_free() to free the associated resources
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterRect *
|
||
clutter_rect_copy (const ClutterRect *rect)
|
||
{
|
||
if (rect != NULL)
|
||
{
|
||
ClutterRect *res;
|
||
|
||
res = g_slice_dup (ClutterRect, rect);
|
||
clutter_rect_normalize_internal (res);
|
||
|
||
return res;
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_free:
|
||
* @rect: a #ClutterRect
|
||
*
|
||
* Frees the resources allocated by @rect.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
void
|
||
clutter_rect_free (ClutterRect *rect)
|
||
{
|
||
if (rect != NULL && rect != &_clutter_rect_zero)
|
||
g_slice_free (ClutterRect, rect);
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_equals:
|
||
* @a: a #ClutterRect
|
||
* @b: a #ClutterRect
|
||
*
|
||
* Checks whether @a and @b are equals.
|
||
*
|
||
* This function will normalize both @a and @b before comparing
|
||
* their origin and size.
|
||
*
|
||
* Return value: %TRUE if the rectangles match in origin and size.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
gboolean
|
||
clutter_rect_equals (ClutterRect *a,
|
||
ClutterRect *b)
|
||
{
|
||
if (a == b)
|
||
return TRUE;
|
||
|
||
if (a == NULL || b == NULL)
|
||
return FALSE;
|
||
|
||
clutter_rect_normalize_internal (a);
|
||
clutter_rect_normalize_internal (b);
|
||
|
||
return clutter_point_equals (&a->origin, &b->origin) &&
|
||
clutter_size_equals (&a->size, &b->size);
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_normalize:
|
||
* @rect: a #ClutterRect
|
||
*
|
||
* Normalizes a #ClutterRect.
|
||
*
|
||
* A #ClutterRect is defined by the area covered by its size; this means
|
||
* that a #ClutterRect with #ClutterRect.origin in [ 0, 0 ] and a
|
||
* #ClutterRect.size of [ 10, 10 ] is equivalent to a #ClutterRect with
|
||
* #ClutterRect.origin in [ 10, 10 ] and a #ClutterRect.size of [ -10, -10 ].
|
||
*
|
||
* This function is useful to ensure that a rectangle has positive width
|
||
* and height; it will modify the passed @rect and normalize its size.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterRect *
|
||
clutter_rect_normalize (ClutterRect *rect)
|
||
{
|
||
g_return_val_if_fail (rect != NULL, NULL);
|
||
|
||
clutter_rect_normalize_internal (rect);
|
||
|
||
return rect;
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_get_center:
|
||
* @rect: a #ClutterRect
|
||
* @center: (out caller-allocates): a #ClutterPoint
|
||
*
|
||
* Retrieves the center of @rect, after normalizing the rectangle,
|
||
* and updates @center with the correct coordinates.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
void
|
||
clutter_rect_get_center (ClutterRect *rect,
|
||
ClutterPoint *center)
|
||
{
|
||
g_return_if_fail (rect != NULL);
|
||
g_return_if_fail (center != NULL);
|
||
|
||
clutter_rect_normalize_internal (rect);
|
||
|
||
center->x = rect->origin.x + (rect->size.width / 2.0f);
|
||
center->y = rect->origin.y + (rect->size.height / 2.0f);
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_contains_point:
|
||
* @rect: a #ClutterRect
|
||
* @point: the point to check
|
||
*
|
||
* Checks whether @point is contained by @rect, after normalizing the
|
||
* rectangle.
|
||
*
|
||
* Return value: %TRUE if the @point is contained by @rect.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
gboolean
|
||
clutter_rect_contains_point (ClutterRect *rect,
|
||
ClutterPoint *point)
|
||
{
|
||
g_return_val_if_fail (rect != NULL, FALSE);
|
||
g_return_val_if_fail (point != NULL, FALSE);
|
||
|
||
clutter_rect_normalize_internal (rect);
|
||
|
||
return (point->x >= rect->origin.x) &&
|
||
(point->y >= rect->origin.y) &&
|
||
(point->x <= (rect->origin.x + rect->size.width)) &&
|
||
(point->y <= (rect->origin.y + rect->size.height));
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_contains_rect:
|
||
* @a: a #ClutterRect
|
||
* @b: a #ClutterRect
|
||
*
|
||
* Checks whether @a contains @b.
|
||
*
|
||
* The first rectangle contains the second if the union of the
|
||
* two #ClutterRect is equal to the first rectangle.
|
||
*
|
||
* Return value: %TRUE if the first rectangle contains the second.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
gboolean
|
||
clutter_rect_contains_rect (ClutterRect *a,
|
||
ClutterRect *b)
|
||
{
|
||
ClutterRect res;
|
||
|
||
g_return_val_if_fail (a != NULL, FALSE);
|
||
g_return_val_if_fail (b != NULL, FALSE);
|
||
|
||
clutter_rect_union (a, b, &res);
|
||
|
||
return clutter_rect_equals (a, &res);
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_union:
|
||
* @a: a #ClutterRect
|
||
* @b: a #ClutterRect
|
||
* @res: (out caller-allocates): a #ClutterRect
|
||
*
|
||
* Computes the smallest possible rectangle capable of fully containing
|
||
* both @a and @b, and places it into @res.
|
||
*
|
||
* This function will normalize both @a and @b prior to computing their
|
||
* union.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
void
|
||
clutter_rect_union (ClutterRect *a,
|
||
ClutterRect *b,
|
||
ClutterRect *res)
|
||
{
|
||
g_return_if_fail (a != NULL);
|
||
g_return_if_fail (b != NULL);
|
||
g_return_if_fail (res != NULL);
|
||
|
||
clutter_rect_normalize_internal (a);
|
||
clutter_rect_normalize_internal (b);
|
||
|
||
res->origin.x = MIN (a->origin.x, b->origin.x);
|
||
res->origin.y = MIN (a->origin.y, b->origin.y);
|
||
|
||
res->size.width = MAX (a->size.width, b->size.width);
|
||
res->size.height = MAX (a->size.height, b->size.height);
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_intersection:
|
||
* @a: a #ClutterRect
|
||
* @b: a #ClutterRect
|
||
* @res: (out caller-allocates) (allow-none): a #ClutterRect, or %NULL
|
||
*
|
||
* Computes the intersection of @a and @b, and places it in @res, if @res
|
||
* is not %NULL.
|
||
*
|
||
* This function will normalize both @a and @b prior to computing their
|
||
* intersection.
|
||
*
|
||
* This function can be used to simply check if the intersection of @a and @b
|
||
* is not empty, by using %NULL for @res.
|
||
*
|
||
* Return value: %TRUE if the intersection of @a and @b is not empty
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
gboolean
|
||
clutter_rect_intersection (ClutterRect *a,
|
||
ClutterRect *b,
|
||
ClutterRect *res)
|
||
{
|
||
float x_1, y_1, x_2, y_2;
|
||
|
||
g_return_val_if_fail (a != NULL, FALSE);
|
||
g_return_val_if_fail (b != NULL, FALSE);
|
||
|
||
clutter_rect_normalize_internal (a);
|
||
clutter_rect_normalize_internal (b);
|
||
|
||
x_1 = MAX (a->origin.x, b->origin.y);
|
||
y_1 = MAX (a->origin.y, b->origin.y);
|
||
x_2 = MIN (a->origin.x + a->size.width, b->origin.x + b->size.width);
|
||
y_2 = MIN (a->origin.y + a->size.height, b->origin.y + b->size.height);
|
||
|
||
if (x_1 >= x_2 || y_1 >= y_2)
|
||
{
|
||
if (res != NULL)
|
||
clutter_rect_init (res, 0.f, 0.f, 0.f, 0.f);
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
if (res != NULL)
|
||
clutter_rect_init (res, x_1, y_1, x_2 - x_1, y_2 - y_1);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_offset:
|
||
* @rect: a #ClutterRect
|
||
* @d_x: the horizontal offset value
|
||
* @d_y: the vertical offset value
|
||
*
|
||
* Offsets the origin of @rect by the given values, after normalizing
|
||
* the rectangle.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
void
|
||
clutter_rect_offset (ClutterRect *rect,
|
||
float d_x,
|
||
float d_y)
|
||
{
|
||
g_return_if_fail (rect != NULL);
|
||
|
||
clutter_rect_normalize_internal (rect);
|
||
|
||
rect->origin.x += d_x;
|
||
rect->origin.y += d_y;
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_inset:
|
||
* @rect: a #ClutterRect
|
||
* @d_x: an horizontal value; a positive @d_x will create an inset rectangle,
|
||
* and a negative value will create a larger rectangle
|
||
* @d_y: a vertical value; a positive @d_x will create an inset rectangle,
|
||
* and a negative value will create a larger rectangle
|
||
*
|
||
* Normalizes the @rect and offsets its origin by the @d_x and @d_y values;
|
||
* the size is adjusted by (2 * @d_x, 2 * @d_y).
|
||
*
|
||
* If @d_x and @d_y are positive the size of the rectangle is decreased; if
|
||
* the values are negative, the size of the rectangle is increased.
|
||
*
|
||
* If the resulting rectangle has a negative width or height, the size is
|
||
* set to 0.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
void
|
||
clutter_rect_inset (ClutterRect *rect,
|
||
float d_x,
|
||
float d_y)
|
||
{
|
||
g_return_if_fail (rect != NULL);
|
||
|
||
clutter_rect_normalize_internal (rect);
|
||
|
||
rect->origin.x += d_x;
|
||
rect->origin.y += d_y;
|
||
|
||
if (d_x >= 0.f)
|
||
rect->size.width -= (d_x * 2.f);
|
||
else
|
||
rect->size.width += (d_x * -2.f);
|
||
|
||
if (d_y >= 0.f)
|
||
rect->size.height -= (d_y * 2.f);
|
||
else
|
||
rect->size.height += (d_y * -2.f);
|
||
|
||
if (rect->size.width < 0.f)
|
||
rect->size.width = 0.f;
|
||
|
||
if (rect->size.height < 0.f)
|
||
rect->size.height = 0.f;
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_clamp_to_pixel:
|
||
* @rect: a #ClutterRect
|
||
*
|
||
* Rounds the origin of @rect downwards to the nearest integer, and rounds
|
||
* the size of @rect upwards to the nearest integer, so that @rect is
|
||
* updated to the smallest rectangle capable of fully containing the
|
||
* original, fractional rectangle.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
void
|
||
clutter_rect_clamp_to_pixel (ClutterRect *rect)
|
||
{
|
||
g_return_if_fail (rect != NULL);
|
||
|
||
clutter_rect_normalize_internal (rect);
|
||
|
||
rect->origin.x = floorf (rect->origin.x);
|
||
rect->origin.y = floorf (rect->origin.y);
|
||
|
||
rect->size.width = ceilf (rect->size.width);
|
||
rect->size.height = ceilf (rect->size.height);
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_get_x:
|
||
* @rect: a #ClutterRect
|
||
*
|
||
* Retrieves the X coordinate of the origin of @rect.
|
||
*
|
||
* Return value: the X coordinate of the origin of the rectangle
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
float
|
||
clutter_rect_get_x (ClutterRect *rect)
|
||
{
|
||
g_return_val_if_fail (rect != NULL, 0.f);
|
||
|
||
clutter_rect_normalize_internal (rect);
|
||
|
||
return rect->origin.x;
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_get_y:
|
||
* @rect: a #ClutterRect
|
||
*
|
||
* Retrieves the Y coordinate of the origin of @rect.
|
||
*
|
||
* Return value: the Y coordinate of the origin of the rectangle
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
float
|
||
clutter_rect_get_y (ClutterRect *rect)
|
||
{
|
||
g_return_val_if_fail (rect != NULL, 0.f);
|
||
|
||
clutter_rect_normalize_internal (rect);
|
||
|
||
return rect->origin.y;
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_get_width:
|
||
* @rect: a #ClutterRect
|
||
*
|
||
* Retrieves the width of @rect.
|
||
*
|
||
* Return value: the width of the rectangle
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
float
|
||
clutter_rect_get_width (ClutterRect *rect)
|
||
{
|
||
g_return_val_if_fail (rect != NULL, 0.f);
|
||
|
||
clutter_rect_normalize_internal (rect);
|
||
|
||
return rect->size.width;
|
||
}
|
||
|
||
/**
|
||
* clutter_rect_get_height:
|
||
* @rect: a #ClutterRect
|
||
*
|
||
* Retrieves the height of @rect.
|
||
*
|
||
* Return value: the height of the rectangle
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
float
|
||
clutter_rect_get_height (ClutterRect *rect)
|
||
{
|
||
g_return_val_if_fail (rect != NULL, 0.f);
|
||
|
||
clutter_rect_normalize_internal (rect);
|
||
|
||
return rect->size.height;
|
||
}
|
||
|
||
static gboolean
|
||
clutter_rect_progress (const GValue *a,
|
||
const GValue *b,
|
||
gdouble progress,
|
||
GValue *retval)
|
||
{
|
||
const ClutterRect *rect_a = g_value_get_boxed (a);
|
||
const ClutterRect *rect_b = g_value_get_boxed (b);
|
||
ClutterRect res = CLUTTER_RECT_INIT_ZERO;
|
||
|
||
#define INTERPOLATE(r_a,r_b,member,field,factor) ((r_a)->member.field + (((r_b)->member.field - ((r_b)->member.field)) * (factor)))
|
||
|
||
res.origin.x = INTERPOLATE (rect_a, rect_b, origin, x, progress);
|
||
res.origin.y = INTERPOLATE (rect_a, rect_b, origin, y, progress);
|
||
|
||
res.size.width = INTERPOLATE (rect_a, rect_b, size, width, progress);
|
||
res.size.height = INTERPOLATE (rect_a, rect_b, size, height, progress);
|
||
|
||
#undef INTERPOLATE
|
||
|
||
clutter_rect_normalize_internal (&res);
|
||
|
||
g_value_set_boxed (retval, &res);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/**
|
||
* ClutterMatrix:
|
||
*
|
||
* A type representing a 4x4 matrix.
|
||
*
|
||
* It is identicaly to #CoglMatrix.
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
|
||
static gpointer
|
||
clutter_matrix_copy (gpointer data)
|
||
{
|
||
return cogl_matrix_copy (data);
|
||
}
|
||
|
||
static gboolean
|
||
clutter_matrix_progress (const GValue *a,
|
||
const GValue *b,
|
||
gdouble progress,
|
||
GValue *retval)
|
||
{
|
||
const ClutterMatrix *matrix1 = g_value_get_boxed (a);
|
||
const ClutterMatrix *matrix2 = g_value_get_boxed (b);
|
||
ClutterVertex scale1 = CLUTTER_VERTEX_INIT (1.f, 1.f, 1.f);
|
||
float shear1[3] = { 0.f, 0.f, 0.f };
|
||
ClutterVertex rotate1 = CLUTTER_VERTEX_INIT_ZERO;
|
||
ClutterVertex translate1 = CLUTTER_VERTEX_INIT_ZERO;
|
||
ClutterVertex4 perspective1 = { 0.f, 0.f, 0.f, 0.f };
|
||
ClutterVertex scale2 = CLUTTER_VERTEX_INIT (1.f, 1.f, 1.f);
|
||
float shear2[3] = { 0.f, 0.f, 0.f };
|
||
ClutterVertex rotate2 = CLUTTER_VERTEX_INIT_ZERO;
|
||
ClutterVertex translate2 = CLUTTER_VERTEX_INIT_ZERO;
|
||
ClutterVertex4 perspective2 = { 0.f, 0.f, 0.f, 0.f };
|
||
ClutterVertex scale_res = CLUTTER_VERTEX_INIT (1.f, 1.f, 1.f);
|
||
float shear_res = 0.f;
|
||
ClutterVertex rotate_res = CLUTTER_VERTEX_INIT_ZERO;
|
||
ClutterVertex translate_res = CLUTTER_VERTEX_INIT_ZERO;
|
||
ClutterVertex4 perspective_res = { 0.f, 0.f, 0.f, 0.f };
|
||
ClutterMatrix res;
|
||
|
||
clutter_matrix_init_identity (&res);
|
||
|
||
_clutter_util_matrix_decompose (matrix1,
|
||
&scale1, shear1, &rotate1, &translate1,
|
||
&perspective1);
|
||
_clutter_util_matrix_decompose (matrix2,
|
||
&scale2, shear2, &rotate2, &translate2,
|
||
&perspective2);
|
||
|
||
/* perspective */
|
||
_clutter_util_vertex4_interpolate (&perspective1, &perspective2, progress, &perspective_res);
|
||
res.wx = perspective_res.x;
|
||
res.wy = perspective_res.y;
|
||
res.wz = perspective_res.z;
|
||
res.ww = perspective_res.w;
|
||
|
||
/* translation */
|
||
clutter_vertex_interpolate (&translate1, &translate2, progress, &translate_res);
|
||
cogl_matrix_translate (&res, translate_res.x, translate_res.y, translate_res.z);
|
||
|
||
/* rotation */
|
||
clutter_vertex_interpolate (&rotate1, &rotate2, progress, &rotate_res);
|
||
cogl_matrix_rotate (&res, rotate_res.x, 1.0f, 0.0f, 0.0f);
|
||
cogl_matrix_rotate (&res, rotate_res.y, 0.0f, 1.0f, 0.0f);
|
||
cogl_matrix_rotate (&res, rotate_res.z, 0.0f, 0.0f, 1.0f);
|
||
|
||
/* skew */
|
||
shear_res = shear1[2] + (shear2[2] - shear1[2]) * progress; /* YZ */
|
||
if (shear_res != 0.f)
|
||
_clutter_util_matrix_skew_yz (&res, shear_res);
|
||
|
||
shear_res = shear1[1] + (shear2[1] - shear1[1]) * progress; /* XZ */
|
||
if (shear_res != 0.f)
|
||
_clutter_util_matrix_skew_xz (&res, shear_res);
|
||
|
||
shear_res = shear1[0] + (shear2[0] - shear1[0]) * progress; /* XY */
|
||
if (shear_res != 0.f)
|
||
_clutter_util_matrix_skew_xy (&res, shear_res);
|
||
|
||
/* scale */
|
||
clutter_vertex_interpolate (&scale1, &scale2, progress, &scale_res);
|
||
cogl_matrix_scale (&res, scale_res.x, scale_res.y, scale_res.z);
|
||
|
||
g_value_set_boxed (retval, &res);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
G_DEFINE_BOXED_TYPE_WITH_CODE (ClutterMatrix, clutter_matrix,
|
||
clutter_matrix_copy,
|
||
clutter_matrix_free,
|
||
CLUTTER_REGISTER_INTERVAL_PROGRESS (clutter_matrix_progress))
|
||
|
||
/**
|
||
* clutter_matrix_alloc:
|
||
*
|
||
* Allocates enough memory to hold a #ClutterMatrix.
|
||
*
|
||
* Return value: (transfer full): the newly allocated #ClutterMatrix
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterMatrix *
|
||
clutter_matrix_alloc (void)
|
||
{
|
||
return g_new0 (ClutterMatrix, 1);
|
||
}
|
||
|
||
/**
|
||
* clutter_matrix_free:
|
||
* @matrix: (allow-none): a #ClutterMatrix
|
||
*
|
||
* Frees the memory allocated by clutter_matrix_alloc().
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
void
|
||
clutter_matrix_free (ClutterMatrix *matrix)
|
||
{
|
||
cogl_matrix_free (matrix);
|
||
}
|
||
|
||
/**
|
||
* clutter_matrix_init_identity:
|
||
* @matrix: a #ClutterMatrix
|
||
*
|
||
* Initializes @matrix with the identity matrix, i.e.:
|
||
*
|
||
* |[
|
||
* .xx = 1.0, .xy = 0.0, .xz = 0.0, .xw = 0.0
|
||
* .yx = 0.0, .yy = 1.0, .yz = 0.0, .yw = 0.0
|
||
* .zx = 0.0, .zy = 0.0, .zz = 1.0, .zw = 0.0
|
||
* .wx = 0.0, .wy = 0.0, .wz = 0.0, .ww = 1.0
|
||
* ]|
|
||
*
|
||
* Return value: (transfer none): the initialized #ClutterMatrix
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterMatrix *
|
||
clutter_matrix_init_identity (ClutterMatrix *matrix)
|
||
{
|
||
cogl_matrix_init_identity (matrix);
|
||
|
||
return matrix;
|
||
}
|
||
|
||
/**
|
||
* clutter_matrix_init_from_array:
|
||
* @matrix: a #ClutterMatrix
|
||
* @values: (array fixed-size=16): a C array of 16 floating point values,
|
||
* representing a 4x4 matrix, with column-major order
|
||
*
|
||
* Initializes @matrix with the contents of a C array of floating point
|
||
* values.
|
||
*
|
||
* Return value: (transfer none): the initialzed #ClutterMatrix
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterMatrix *
|
||
clutter_matrix_init_from_array (ClutterMatrix *matrix,
|
||
const float values[16])
|
||
{
|
||
cogl_matrix_init_from_array (matrix, values);
|
||
|
||
return matrix;
|
||
}
|
||
|
||
/**
|
||
* clutter_matrix_init_from_matrix:
|
||
* @a: the #ClutterMatrix to initialize
|
||
* @b: the #ClutterMatrix to copy
|
||
*
|
||
* Initializes the #ClutterMatrix @a with the contents of the
|
||
* #ClutterMatrix @b.
|
||
*
|
||
* Return value: (transfer none): the initialized #ClutterMatrix
|
||
*
|
||
* Since: 1.12
|
||
*/
|
||
ClutterMatrix *
|
||
clutter_matrix_init_from_matrix (ClutterMatrix *a,
|
||
const ClutterMatrix *b)
|
||
{
|
||
return memcpy (a, b, sizeof (ClutterMatrix));
|
||
}
|