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+/* EINA - EFL data type library
+ * Copyright (C) 2007-2008 Jorge Luis Zapata Muga
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library;
+ * if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef EINA_INLINE_RECTANGLE_H__
+#define EINA_INLINE_RECTANGLE_H__
+
+/**
+ * @addtogroup Eina_Rectangle_Group Rectangle
+ *
+ * @brief These functions provide rectangle management.
+ *
+ * @{
+ */
+
+/**
+ * @brief Check if the given spans intersect.
+ *
+ * @param c1 The column of the first span.
+ * @param l1 The length of the first span.
+ * @param c2 The column of the second span.
+ * @param l2 The length of the second span.
+ * @return #EINA_TRUE on success, #EINA_FALSE otherwise.
+ *
+ * This function returns #EINA_TRUE if the  given spans intersect,
+ * #EINA_FALSE otherwise.
+ */
+static inline int
+eina_spans_intersect(int c1, int l1, int c2, int l2)
+{
+        return (!(((c2 + l2) <= c1) || (c2 >= (c1 + l1))));
+}
+
+/**
+ * @brief Check if the given rectangle is empty.
+ *
+ * @param r The rectangle to check.
+ * @return #EINA_TRUE if the rectangle is empty, #EINA_FALSE otherwise.
+ *
+ * This function returns #EINA_TRUE if @p r is empty, #EINA_FALSE
+ * otherwise. No check is done on @p r, so it must be a valid
+ * rectangle.
+ */
+static inline Eina_Bool
+eina_rectangle_is_empty(const Eina_Rectangle *r)
+{
+        return ((r->w < 1) || (r->h < 1)) ? EINA_TRUE : EINA_FALSE;
+}
+
+/**
+ * @brief Set the coordinates and size of the given rectangle.
+ *
+ * @param r The rectangle.
+ * @param x The top-left x coordinate of the rectangle.
+ * @param y The top-left y coordinate of the rectangle.
+ * @param w The width of the rectangle.
+ * @param h The height of the rectangle.
+ *
+ * This function sets its top-left x coordinate to @p x, its top-left
+ * y coordinate to @p y, its width to @p w and its height to @p h. No
+ * check is done on @p r, so it must be a valid rectangle.
+ */
+static inline void
+eina_rectangle_coords_from(Eina_Rectangle *r, int x, int y, int w, int h)
+{
+        r->x = x;
+        r->y = y;
+        r->w = w;
+        r->h = h;
+}
+
+/**
+ * @brief Check if the given rectangles intersect.
+ *
+ * @param r1 The first rectangle.
+ * @param r2 The second rectangle.
+ * @return #EINA_TRUE if the rectangles intersect, #EINA_FALSE otherwise.
+ *
+ * This function returns #EINA_TRUE if @p r1 and @p r2 intersect,
+ * #EINA_FALSE otherwise. No check is done on @p r1 and @p r2, so they
+ * must be valid rectangles.
+ */
+static inline Eina_Bool
+eina_rectangles_intersect(const Eina_Rectangle *r1, const Eina_Rectangle *r2)
+{
+        return (eina_spans_intersect(r1->x, r1->w, r2->x, r2->w) && eina_spans_intersect(r1->y, r1->h, r2->y, r2->h)) ? EINA_TRUE : EINA_FALSE;
+}
+
+/**
+ * @brief Check if the given x-coordinate is in the rectangle .
+ *
+ * @param r The rectangle.
+ * @param x The x coordinate.
+ * @return #EINA_TRUE on success, #EINA_FALSE otherwise.
+ *
+ * This function returns #EINA_TRUE if @p x is in @p r with respect to
+ * the horizontal direction, #EINA_FALSE otherwise. No check is done
+ * on @p r, so it must be a valid rectangle.
+ */
+static inline Eina_Bool
+eina_rectangle_xcoord_inside(const Eina_Rectangle *r, int x)
+{
+        return ((x >= r->x) && (x < (r->x + r->w))) ? EINA_TRUE : EINA_FALSE;
+}
+
+/**
+ * @brief Check if the given y-coordinate is in the rectangle .
+ *
+ * @param r The rectangle.
+ * @param y The y coordinate.
+ * @return #EINA_TRUE on success, #EINA_FALSE otherwise.
+ *
+ * This function returns #EINA_TRUE if @p y is in @p r with respect to
+ * the vertical direction, #EINA_FALSE otherwise. No check is done
+ * on @p r, so it must be a valid rectangle.
+ */
+static inline Eina_Bool
+eina_rectangle_ycoord_inside(const Eina_Rectangle *r, int y)
+{
+        return ((y >= r->y) && (y < (r->y + r->h))) ? EINA_TRUE : EINA_FALSE;
+}
+
+/**
+ * @brief Check if the given point is in the rectangle .
+ *
+ * @param r The rectangle.
+ * @param x The x coordinate of the point.
+ * @param y The y coordinate of the point.
+ * @return #EINA_TRUE on success, #EINA_FALSE otherwise.
+ *
+ * This function returns #EINA_TRUE if the point of coordinate (@p x,
+ * @p y) is in @p r, #EINA_FALSE otherwise. No check is done on @p r,
+ * so it must be a valid rectangle.
+ */
+static inline Eina_Bool
+eina_rectangle_coords_inside(const Eina_Rectangle *r, int x, int y)
+{
+        return (eina_rectangle_xcoord_inside(r, x) && eina_rectangle_ycoord_inside(r, y)) ? EINA_TRUE : EINA_FALSE;
+}
+
+/**
+ * @brief Get the union of two rectangles.
+ *
+ * @param dst The first rectangle.
+ * @param src The second rectangle.
+ *
+ * This function get the union of the rectangles @p dst and @p src. The
+ * result is stored in @p dst. No check is done on @p dst or @p src,
+ * so they must be valid rectangles.
+ */
+static inline void
+eina_rectangle_union(Eina_Rectangle *dst, const Eina_Rectangle *src)
+{
+        /* left */
+        if (dst->x > src->x)
+        {
+                dst->w += dst->x - src->x;
+                dst->x = src->x;
+        }
+        /* right */
+        if ((dst->x + dst->w) < (src->x + src->w))
+                dst->w = src->x + src->w;
+        /* top */
+        if (dst->y > src->y)
+        {
+                dst->h += dst->y - src->y;
+                dst->y = src->y;
+        }
+        /* bottom */
+        if ((dst->y + dst->h) < (src->y + src->h))
+                dst->h = src->y + src->h;
+}
+
+/**
+ * @brief Get the intersection of two rectangles.
+ *
+ * @param dst The first rectangle.
+ * @param src The second rectangle.
+ * @return #EINA_TRUE if the rectangles intersect, #EINA_FALSE
+ * otherwise.
+ *
+ * This function get the intersection of the rectangles @p dst and
+ * @p src. The result is stored in @p dst. No check is done on @p dst
+ * or @p src, so they must be valid rectangles.
+ */
+static inline Eina_Bool
+eina_rectangle_intersection(Eina_Rectangle *dst, const Eina_Rectangle *src)
+{
+        if (!(eina_rectangles_intersect(dst, src)))
+                return EINA_FALSE;
+
+        /* left */
+        if (dst->x < src->x)
+        {
+                dst->w += dst->x - src->x;
+                dst->x = src->x;
+                if (dst->w < 0)
+                        dst->w = 0;
+        }
+        /* right */
+        if ((dst->x + dst->w) > (src->x + src->w))
+                dst->w = src->x + src->w - dst->x;
+        /* top */
+        if (dst->y < src->y)
+        {
+                dst->h += dst->y - src->y;
+                dst->y = src->y;
+                if (dst->h < 0)
+                        dst->h = 0;
+        }
+        /* bottom */
+        if ((dst->y + dst->h) > (src->y + src->h))
+                dst->h = src->y + src->h - dst->y;
+
+        return EINA_TRUE;
+}
+
+static inline void
+eina_rectangle_rescale_in(const Eina_Rectangle *out, const Eina_Rectangle *in, Eina_Rectangle *res)
+{
+        res->x = in->x - out->x;
+        res->y = in->y - out->y;
+        res->w = in->w;
+        res->h = in->h;
+}
+
+static inline void
+eina_rectangle_rescale_out(const Eina_Rectangle *out, const Eina_Rectangle *in, Eina_Rectangle *res)
+{
+        res->x = out->x + in->x;
+        res->y = out->y + in->y;
+        res->w = out->w;
+        res->h = out->h;
+}
+
+/**
+ * @}
+ */
+
+#endif