forked from enlightenment/efl
197 lines
4.0 KiB
C
197 lines
4.0 KiB
C
/* EINA - EFL data type library
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* Copyright (C) 2007-2008 Jorge Luis Zapata Muga
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library;
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* if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef EINA_RECTANGLE_H_
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#define EINA_RECTANGLE_H_
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/**
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* @file
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* @{
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*/
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/**
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* To be documented
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* FIXME: To be fixed
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*/
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typedef struct _Eina_Rectangle
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{
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int x;
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int y;
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int w;
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int h;
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} Eina_Rectangle;
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/**
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* To be documented
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* FIXME: To be fixed
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* Is it needed??
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*/
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static inline int
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eina_spans_intersect(int c1, int l1, int c2, int l2)
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{
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return (!(((c2 + l2) <= c1) || (c2 >= (c1 + l1))));
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}
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/**
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* To be documented
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* FIXME: To be fixed
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*/
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static inline Eina_Bool
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eina_rectangle_is_empty(Eina_Rectangle *r)
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{
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return ((r->w < 1) || (r->h < 1));
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}
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/**
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* To be documented
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* FIXME: To be fixed
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*/
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static inline void
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eina_rectangle_coords_from(Eina_Rectangle *r, int x, int y, int w, int h)
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{
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r->x = x;
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r->y = y;
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r->w = w;
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r->h = h;
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}
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/**
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* To be documented
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* FIXME: To be fixed
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*/
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static inline Eina_Bool
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eina_rectangles_intersect(Eina_Rectangle *r1, Eina_Rectangle *r2)
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{
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return (eina_spans_intersect(r1->x, r1->w, r2->x, r2->w) && eina_spans_intersect(r1->y, r1->h, r2->y, r2->h));
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}
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/**
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* To be documented
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* FIXME: To be fixed
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*/
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static inline Eina_Bool
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eina_rectangle_xcoord_inside(Eina_Rectangle *r, int x)
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{
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return ((x >= r->x) && (x < (r->x + r->w)));
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}
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/**
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* To be documented
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* FIXME: To be fixed
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*/
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static inline Eina_Bool
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eina_rectangle_ycoord_inside(Eina_Rectangle *r, int y)
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{
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return ((y >= r->y) && (y < (r->y + r->h)));
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}
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/**
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* To be documented
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* FIXME: To be fixed
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*/
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static inline Eina_Bool
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eina_rectangle_coords_inside(Eina_Rectangle *r, int x, int y)
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{
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return (eina_rectangle_xcoord_inside(r, x) && eina_rectangle_ycoord_inside(r, y));
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}
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/**
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* To be documented
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* FIXME: To be fixed
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*/
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static inline void
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eina_rectangle_union(Eina_Rectangle *dst, Eina_Rectangle *src)
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{
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/* left */
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if (dst->x > src->x)
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{
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dst->w += dst->x - src->x;
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dst->x = src->x;
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}
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/* right */
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if ((dst->x + dst->w) < (src->x + src->w))
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dst->w = src->x + src->w;
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/* top */
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if (dst->y > src->y)
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{
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dst->h += dst->y - src->y;
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dst->y = src->y;
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}
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/* bottom */
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if ((dst->y + dst->h) < (src->y + src->h))
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dst->h = src->y + src->h;
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}
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/**
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* To be documented
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* FIXME: To be fixed
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*/
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static inline Eina_Bool
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eina_rectangle_intersection(Eina_Rectangle *dst, Eina_Rectangle *src)
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{
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if (!(eina_rectangles_intersect(dst, src)))
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return EINA_FALSE;
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/* left */
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if (dst->x < src->x)
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{
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dst->w += dst->x - src->x;
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dst->x = src->x;
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if (dst->w < 0)
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dst->w = 0;
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}
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/* right */
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if ((dst->x + dst->w) > (src->x + src->w))
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dst->w = src->x + src->w - dst->x;
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/* top */
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if (dst->y < src->y)
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{
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dst->h += dst->y - src->y;
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dst->y = src->y;
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if (dst->h < 0)
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dst->h = 0;
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}
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/* bottom */
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if ((dst->y + dst->h) > (src->y + src->h))
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dst->h = src->y + src->h - dst->y;
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return EINA_TRUE;
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}
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/**
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* Rescale the coordinates from @in as if it where relative to @out
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*/
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static inline void
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eina_rectangle_rescale_in(Eina_Rectangle *out, Eina_Rectangle *in, Eina_Rectangle *res)
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{
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res->x = in->x - out->x;
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res->y = in->y - out->y;
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res->w = in->w;
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res->h = in->h;
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}
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/**
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* To be documented
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* FIXME: To be fixed
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*/
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static inline void
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eina_rectangle_rescale_out(Eina_Rectangle *out, Eina_Rectangle *in, Eina_Rectangle *res)
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{
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res->x = out->x + in->x;
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res->y = out->y + in->y;
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res->w = out->w;
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res->h = out->h;
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}
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/** @} */
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#endif /*_ENESIM_RECTANGLE_H_*/
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