88 lines
3.3 KiB
C
88 lines
3.3 KiB
C
/* BSD 3-Clause License
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*
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* Copyright © 2008-2022, Jice and the libtcod contributors.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _TCOD_BRESENHAM_H
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#define _TCOD_BRESENHAM_H
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#include "portability.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief A callback to be passed to TCOD_line
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*
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* The points given to the callback include both the starting and ending
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* positions.
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*
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* \param x
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* \param y
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* \return As long as this callback returns true it will be called with the
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* next x,y point on the line.
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*/
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typedef bool (*TCOD_line_listener_t)(int x, int y);
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TCODLIB_API TCOD_DEPRECATED("This function is not reentrant. Use TCOD_line_init_mt instead.") void TCOD_line_init(
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int xFrom, int yFrom, int xTo, int yTo);
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/** advance one step. returns true if we reach destination */
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TCODLIB_API TCOD_DEPRECATED("This function is not reentrant.") bool TCOD_line_step(
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int* __restrict xCur, int* __restrict yCur);
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/* atomic callback function. Stops when the callback returns false */
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TCODLIB_API bool TCOD_line(int xFrom, int yFrom, int xTo, int yTo, TCOD_line_listener_t listener);
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/**
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* \brief A struct used for computing a bresenham line.
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*/
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typedef struct {
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int stepx;
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int stepy;
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int e;
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int deltax;
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int deltay;
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int origx;
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int origy;
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int destx;
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int desty;
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} TCOD_bresenham_data_t;
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TCODLIB_API void TCOD_line_init_mt(int xFrom, int yFrom, int xTo, int yTo, TCOD_bresenham_data_t* data);
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TCODLIB_API bool TCOD_line_step_mt(int* __restrict xCur, int* __restrict yCur, TCOD_bresenham_data_t* __restrict data);
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TCOD_DEPRECATED("Use TCOD_line instead.")
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TCODLIB_API bool TCOD_line_mt(
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int xFrom, int yFrom, int xTo, int yTo, TCOD_line_listener_t listener, TCOD_bresenham_data_t* data);
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#ifdef __cplusplus
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} // extern "C"
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#endif // __cplusplus
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#endif // _TCOD_BRESENHAM_H
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