gp_bbox.h

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//SPDX-License-Identifier: LGPL-2.0-or-later
 
/*
 
   Copyright (c) 2014-2020 Cyril Hrubis <metan@ucw.cz>
 
 */
 
#ifndef GP_BBOX_H
#define GP_BBOX_H
 
#include <core/gp_types.h>
#include <core/gp_common.h>
 
typedef struct gp_bbox {
        gp_coord x;
        gp_coord y;
        gp_size w;
        gp_size h;
} gp_bbox;
 
static inline int gp_bbox_empty(gp_bbox box)
{
        return box.w == 0 || box.h == 0;
}
 
static inline gp_bbox gp_bbox_pack(gp_coord x, gp_coord y, gp_coord w, gp_coord h)
{
        gp_bbox box = {
                .x = x,
                .y = y,
                .w = w,
                .h = h,
        };
 
        return box;
}
 
static inline gp_bbox gp_bbox_merge(gp_bbox box1, gp_bbox box2)
{
        gp_bbox box = {
                .x = GP_MIN(box1.x, box2.x),
                .y = GP_MIN(box1.y, box2.y),
                .w = GP_MAX(box1.x + box1.w, box2.x + box2.w) - GP_MIN(box1.x, box2.x),
                .h = GP_MAX(box1.y + box1.h, box2.y + box2.h) - GP_MIN(box1.y, box2.y),
        };
 
        return box;
}
 
static inline gp_bbox gp_bbox_intersection(gp_bbox box1, gp_bbox box2)
{
        gp_bbox box = {
                .x = GP_MAX(box1.x, box2.x),
                .y = GP_MAX(box1.y, box2.y),
                .w = GP_MIN(box1.x + box1.w, box2.x + box2.w) - GP_MAX(box1.x, box2.x),
                .h = GP_MIN(box1.y + box1.h, box2.y + box2.h) - GP_MAX(box1.y, box2.y),
        };
 
        return box;
}
 
static inline int gp_bbox_intersects(gp_bbox box1, gp_bbox box2)
{
        if (box1.x > box2.x + (gp_coord)box2.w)
                return 0;
 
        if (box2.x > box1.x + (gp_coord)box1.w)
                return 0;
 
        if (box1.y > box2.y + (gp_coord)box2.h)
                return 0;
 
        if (box2.y > box1.y + (gp_coord)box1.h)
                return 0;
 
        return 1;
}
 
static inline gp_bbox gp_bbox_move(gp_bbox box, gp_coord x, gp_coord y)
{
        return gp_bbox_pack(box.x + x, box.y + y, box.w, box.h);
}
 
#define GP_BBOX_FMT "[%i, %i] w=%u h=%u"
#define GP_BBOX_PARS(bbox) (bbox).x, (bbox).y, (bbox).w, (bbox).h
 
#endif /* GP_BBOX_H */