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| -rw-r--r-- | libgimpbase/gimprectangle.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/libgimpbase/gimprectangle.c b/libgimpbase/gimprectangle.c new file mode 100644 index 0000000..678ff82 --- /dev/null +++ b/libgimpbase/gimprectangle.c @@ -0,0 +1,133 @@ +/* LIBGIMP - The GIMP Library + * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis + * + * gimprectangle.c + * + * 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 3 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 + * <https://www.gnu.org/licenses/>. + */ + +#include "config.h" + +#include <glib.h> + +#include "gimprectangle.h" + + +/** + * SECTION: gimprectangle + * @title: gimprectangle + * @short_description: Utility functions dealing with rectangle extents. + * + * Utility functions dealing with rectangle extents. + **/ + + +/** + * gimp_rectangle_intersect: + * @x1: origin of first rectangle + * @y1: origin of first rectangle + * @width1: width of first rectangle + * @height1: height of first rectangle + * @x2: origin of second rectangle + * @y2: origin of second rectangle + * @width2: width of second rectangle + * @height2: height of second rectangle + * @dest_x: return location for origin of intersection (may be %NULL) + * @dest_y: return location for origin of intersection (may be %NULL) + * @dest_width: return location for width of intersection (may be %NULL) + * @dest_height: return location for height of intersection (may be %NULL) + * + * Calculates the intersection of two rectangles. + * + * Return value: %TRUE if the intersection is non-empty, %FALSE otherwise + * + * Since: 2.4 + **/ +gboolean +gimp_rectangle_intersect (gint x1, + gint y1, + gint width1, + gint height1, + gint x2, + gint y2, + gint width2, + gint height2, + gint *dest_x, + gint *dest_y, + gint *dest_width, + gint *dest_height) +{ + gint d_x, d_y; + gint d_w, d_h; + + d_x = MAX (x1, x2); + d_y = MAX (y1, y2); + d_w = MIN (x1 + width1, x2 + width2) - d_x; + d_h = MIN (y1 + height1, y2 + height2) - d_y; + + if (dest_x) *dest_x = d_x; + if (dest_y) *dest_y = d_y; + if (dest_width) *dest_width = d_w; + if (dest_height) *dest_height = d_h; + + return (d_w > 0 && d_h > 0); +} + +/** + * gimp_rectangle_union: + * @x1: origin of first rectangle + * @y1: origin of first rectangle + * @width1: width of first rectangle + * @height1: height of first rectangle + * @x2: origin of second rectangle + * @y2: origin of second rectangle + * @width2: width of second rectangle + * @height2: height of second rectangle + * @dest_x: return location for origin of union (may be %NULL) + * @dest_y: return location for origin of union (may be %NULL) + * @dest_width: return location for width of union (may be %NULL) + * @dest_height: return location for height of union (may be %NULL) + * + * Calculates the union of two rectangles. + * + * Since: 2.8 + **/ +void +gimp_rectangle_union (gint x1, + gint y1, + gint width1, + gint height1, + gint x2, + gint y2, + gint width2, + gint height2, + gint *dest_x, + gint *dest_y, + gint *dest_width, + gint *dest_height) +{ + gint d_x, d_y; + gint d_w, d_h; + + d_x = MIN (x1, x2); + d_y = MIN (y1, y2); + d_w = MAX (x1 + width1, x2 + width2) - d_x; + d_h = MAX (y1 + height1, y2 + height2) - d_y; + + if (dest_x) *dest_x = d_x; + if (dest_y) *dest_y = d_y; + if (dest_width) *dest_width = d_w; + if (dest_height) *dest_height = d_h; +} |