| 1 | /*
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| 2 | * Copyright (c) 2012 Petr Koupy
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup softrend
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| 30 | * @{
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| 31 | */
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| 32 | /**
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| 33 | * @file
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| 34 | */
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| 35 |
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| 36 | #include "rectangle.h"
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| 37 |
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| 38 | bool rectangle_intersect(
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| 39 | sysarg_t x1, sysarg_t y1, sysarg_t w1, sysarg_t h1,
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| 40 | sysarg_t x2, sysarg_t y2, sysarg_t w2, sysarg_t h2,
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| 41 | sysarg_t *x_out, sysarg_t *y_out, sysarg_t *w_out, sysarg_t *h_out)
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| 42 | {
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| 43 | sysarg_t l, r, t, b;
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| 44 |
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| 45 | l = x1 < x2 ? x2 : x1;
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| 46 | t = y1 < y2 ? y2 : y1;
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| 47 | r = x1 + w1 < x2 + w2 ? x1 + w1 : x2 + w2;
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| 48 | b = y1 + h1 < y2 + h2 ? y1 + h1 : y2 + h2;
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| 49 |
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| 50 | if (l < r && t < b) {
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| 51 | (*x_out) = l;
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| 52 | (*y_out) = t;
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| 53 | (*w_out) = r - l;
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| 54 | (*h_out) = b - t;
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| 55 | return true;
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| 56 | } else {
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| 57 | (*x_out) = 0;
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| 58 | (*y_out) = 0;
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| 59 | (*w_out) = 0;
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| 60 | (*h_out) = 0;
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| 61 | return false;
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| 62 | }
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| 63 | }
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| 64 |
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| 65 | void rectangle_union(
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| 66 | sysarg_t x1, sysarg_t y1, sysarg_t w1, sysarg_t h1,
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| 67 | sysarg_t x2, sysarg_t y2, sysarg_t w2, sysarg_t h2,
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| 68 | sysarg_t *x_out, sysarg_t *y_out, sysarg_t *w_out, sysarg_t *h_out)
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| 69 | {
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| 70 | sysarg_t l, r, t, b;
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| 71 |
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| 72 | l = x1 > x2 ? x2 : x1;
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| 73 | t = y1 > y2 ? y2 : y1;
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| 74 | r = x1 + w1 > x2 + w2 ? x1 + w1 : x2 + w2;
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| 75 | b = y1 + h1 > y2 + h2 ? y1 + h1 : y2 + h2;
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| 76 |
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| 77 | (*x_out) = l;
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| 78 | (*y_out) = t;
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| 79 | (*w_out) = r - l;
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| 80 | (*h_out) = b - t;
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| 81 | }
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| 82 |
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| 83 | /** @}
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| 84 | */
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