source: mainline/uspace/lib/softrend/rectangle.c@ 959b7ec

/*
 * Copyright (c) 2012 Petr Koupy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup softrend
 * @{
 */
/**
 * @file
 */

#include "rectangle.h"

bool rectangle_intersect(
    sysarg_t x1, sysarg_t y1, sysarg_t w1, sysarg_t h1,
    sysarg_t x2, sysarg_t y2, sysarg_t w2, sysarg_t h2,
    sysarg_t *x_out, sysarg_t *y_out, sysarg_t *w_out, sysarg_t *h_out)
{
        sysarg_t l, r, t, b;

        l = x1 < x2 ? x2 : x1;
        t = y1 < y2 ? y2 : y1;
        r = x1 + w1 < x2 + w2 ? x1 + w1 : x2 + w2;
        b = y1 + h1 < y2 + h2 ? y1 + h1 : y2 + h2;

        if (l < r && t < b) {
                (*x_out) = l;
                (*y_out) = t;
                (*w_out) = r - l;
                (*h_out) = b - t;
                return true;
        } else {
                (*x_out) = 0;
                (*y_out) = 0;
                (*w_out) = 0;
                (*h_out) = 0;
                return false;
        }
}

void rectangle_union(
    sysarg_t x1, sysarg_t y1, sysarg_t w1, sysarg_t h1,
    sysarg_t x2, sysarg_t y2, sysarg_t w2, sysarg_t h2,
    sysarg_t *x_out, sysarg_t *y_out, sysarg_t *w_out, sysarg_t *h_out)
{
        sysarg_t l, r, t, b;

        l = x1 > x2 ? x2 : x1;
        t = y1 > y2 ? y2 : y1;
        r = x1 + w1 > x2 + w2 ? x1 + w1 : x2 + w2;
        b = y1 + h1 > y2 + h2 ? y1 + h1 : y2 + h2;

        (*x_out) = l;
        (*y_out) = t;
        (*w_out) = r - l;
        (*h_out) = b - t;
}

/** @}
 */