187 lines
5.9 KiB
C
187 lines
5.9 KiB
C
/*
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* File : matrix.h
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* This file is part of RT-Thread GUI Engine
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* COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2010-04-10 Grissiom The first version
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*/
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#ifndef __MATRIX_H__
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#define __MATRIX_H__
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/* Port from ejoy2d: https://github.com/cloudwu/ejoy2d/blob/master/LICENSE
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* Original License:
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013 Ejoy.com Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/* Port to RTGUI and modified by Grissiom */
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#ifdef _MSC_VER
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typedef __int32 int32_t;
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typedef unsigned __int32 uint32_t;
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typedef __int64 int64_t;
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typedef unsigned __int64 uint64_t;
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#else
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#include <stdint.h>
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#endif
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#define RTGUI_MATRIX_FRAC_BITS 11
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#define RTGUI_MATRIX_FRAC (1 << RTGUI_MATRIX_FRAC_BITS)
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struct rtgui_matrix
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{
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/* The matrix format is :
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*
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* | m[0] m[1] 0 |
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* | m[2] m[3] 0 |
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* | m[4] m[5] 1 |
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*
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* The format of the coordinate of a point is:
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*
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* | x y 1 |
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*
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* So, if you want to transform a point p with a matrix m, do:
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*
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* p * m
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*
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* Note: m[0-3] is in fix presentation that has 10 bits decimal
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* fraction(m/RTGUI_MATRIX_FRAC). While the unit of m[4-5] is pixel.
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*
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*/
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int m[6];
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};
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rt_inline int32_t _rtgui_matrix_round_div32(int32_t n, int32_t d)
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{
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if (n == 0)
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return 0;
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if (d < 0)
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{
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d = -d;
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n = -n;
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}
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if (n > 0)
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return (n + d / 2) / d;
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else
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return (n - d / 2) / d;
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}
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rt_inline int32_t _rtgui_matrix_round_div6432(int64_t n, int32_t d)
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{
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if (n == 0)
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return 0;
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if (d < 0)
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{
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d = -d;
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n = -n;
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}
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if (n > 0)
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return (n + d / 2) / d;
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else
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return (n - d / 2) / d;
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}
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/* mm = mm1 * mm2 */
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rt_inline void rtgui_matrix_mul(struct rtgui_matrix *mm,
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const struct rtgui_matrix *mm1,
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const struct rtgui_matrix *mm2)
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{
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int *m = mm->m;
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const int *m1 = mm1->m;
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const int *m2 = mm2->m;
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m[0] = _rtgui_matrix_round_div32(m1[0] * m2[0] + m1[1] * m2[2], RTGUI_MATRIX_FRAC);
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m[1] = _rtgui_matrix_round_div32(m1[0] * m2[1] + m1[1] * m2[3], RTGUI_MATRIX_FRAC);
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m[2] = _rtgui_matrix_round_div32(m1[2] * m2[0] + m1[3] * m2[2], RTGUI_MATRIX_FRAC);
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m[3] = _rtgui_matrix_round_div32(m1[2] * m2[1] + m1[3] * m2[3], RTGUI_MATRIX_FRAC);
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m[4] = _rtgui_matrix_round_div32(m1[4] * m2[0] + m1[5] * m2[2], RTGUI_MATRIX_FRAC) + m2[4];
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m[5] = _rtgui_matrix_round_div32(m1[4] * m2[1] + m1[5] * m2[3], RTGUI_MATRIX_FRAC) + m2[5];
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}
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/* Matrix multiply point[(p) = (x, y) * m], ignore the movement components. */
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rt_inline void rtgui_matrix_mul_point_nomove(struct rtgui_point *p,
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int x, int y,
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struct rtgui_matrix *m)
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{
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int *mm = m->m;
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p->x = _rtgui_matrix_round_div32(x * mm[0] + y * mm[2], RTGUI_MATRIX_FRAC);
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p->y = _rtgui_matrix_round_div32(x * mm[1] + y * mm[3], RTGUI_MATRIX_FRAC);
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}
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/* Matrix multiply point[(p) = (x, y) * m]. */
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rt_inline void rtgui_matrix_mul_point(struct rtgui_point *p,
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int x, int y,
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struct rtgui_matrix *m)
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{
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int *mm = m->m;
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p->x = _rtgui_matrix_round_div32(x * mm[0] + y * mm[2], RTGUI_MATRIX_FRAC) + mm[4];
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p->y = _rtgui_matrix_round_div32(x * mm[1] + y * mm[3], RTGUI_MATRIX_FRAC) + mm[5];
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}
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/** Set @mm to an identity matrix. */
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rt_inline void rtgu_matrix_identity(struct rtgui_matrix *mm)
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{
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int *mat = mm->m;
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mat[0] = RTGUI_MATRIX_FRAC;
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mat[1] = 0;
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mat[2] = 0;
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mat[3] = RTGUI_MATRIX_FRAC;
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mat[4] = 0;
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mat[5] = 0;
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}
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/** Save the inversed matrix of @mm to @mo.
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*
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* @return If the matrix is not inversale, return 1. Otherwise, return 0. */
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int rtgui_matrix_inverse(const struct rtgui_matrix *mm, struct rtgui_matrix *mo);
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/** @degree range from 0 ~ 512. */
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void rtgui_matrix_rotate(struct rtgui_matrix *m, int degree);
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/** The unit is fixed point number. RTGUI_MATRIX_FRAC means 1.0. */
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void rtgui_matrix_scale(struct rtgui_matrix *m, int sx, int sy);
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/** The unit is pixel. Not the fixed point number. */
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void rtgui_matrix_move(struct rtgui_matrix *m, int dx, int dy);
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#endif /* end of include guard: __MATRIX_H__ */
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