mirror of
https://github.com/brl/mutter.git
synced 2024-12-24 12:02:04 +00:00
1f0826543e
This adds a utility function that can determine if a given point intersects an arbitrary polygon, by counting how many edges a "semi-infinite" horizontal ray crosses from that point. The plan is to use this for a software based read-pixel fast path that avoids using the GPU to rasterize journaled primitives and can instead intersect a point being read with quads in the journal to determine the correct color.
41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/*
|
|
* Cogl
|
|
*
|
|
* An object oriented GL/GLES Abstraction/Utility Layer
|
|
*
|
|
* Copyright (C) 2011 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/>.
|
|
*/
|
|
|
|
#ifndef __COGL_POINT_INT_POLYGON_PRIVATE_H
|
|
#define __COGL_POINT_INT_POLYGON_PRIVATE_H
|
|
|
|
#include <glib.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
int
|
|
_cogl_util_point_in_poly (float point_x,
|
|
float point_y,
|
|
void *vertices,
|
|
size_t stride,
|
|
int n_vertices);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __COGL_POINT_INT_POLYGON_PRIVATE_H */
|
|
|