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/*************************************************************************
* Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension 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 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension 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 program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/*
* A canvas which is rendered to.
*/
#ifndef DIMENSION_CANVAS_H
#define DIMENSION_CANVAS_H
#include <pthread.h>
typedef struct {
unsigned int x, y;
/*
* Stored in first-quadrant representation (origin is bottom-left). The pixel
* at (a,b) is accessible as pixels[b*x + a].
*/
dmnsn_color *pixels;
/* Read-write locks for each pixel */
pthread_rwlock_t *rwlocks;
} dmnsn_canvas;
dmnsn_canvas *dmnsn_new_canvas(unsigned int x, unsigned int y);
void dmnsn_delete_canvas(dmnsn_canvas *canvas);
/* These handle the rwlocks correctly */
dmnsn_color dmnsn_get_pixel(const dmnsn_canvas *canvas,
unsigned int x, unsigned int y);
void dmnsn_set_pixel(dmnsn_canvas *canvas,
unsigned int x, unsigned int y, dmnsn_color color);
/* Manual locking */
void dmnsn_rdlock_pixel(const dmnsn_canvas *canvas,
unsigned int x, unsigned int y);
void dmnsn_wrlock_pixel(dmnsn_canvas *canvas, unsigned int x, unsigned int y);
void dmnsn_unlock_pixel(const dmnsn_canvas *canvas,
unsigned int x, unsigned int y);
#endif /* DIMENSION_CANVAS_H */
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