mirror of https://github.com/GNOME/gimp.git
64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/* bounding-box.h: operations on both real- and integer-valued bounding boxes.
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*
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* Copyright (C) 1992 Free Software Foundation, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BOUNDING_BOX_H
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#define BOUNDING_BOX_H
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#include "types.h"
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/* The bounding box's numbers are usually in Cartesian/Metafont
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coordinates: (0,0) is towards the lower left. */
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typedef struct
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{
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signed_4_bytes min_row, max_row;
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signed_4_bytes min_col, max_col;
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} bounding_box_type;
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typedef struct
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{
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real min_row, max_row;
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real min_col, max_col;
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} real_bounding_box_type;
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/* These accessing macros work for both types of bounding boxes, since
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the member names are the same. */
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#define MIN_ROW(bb) ((bb).min_row)
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#define MAX_ROW(bb) ((bb).max_row)
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#define MIN_COL(bb) ((bb).min_col)
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#define MAX_COL(bb) ((bb).max_col)
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/* See the comments at `get_character_bitmap' in gf_input.c for why the
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width and height are treated asymmetrically. */
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#define BB_WIDTH(bb) (MAX_COL (bb) - MIN_COL (bb))
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#define BB_HEIGHT(bb) (MAX_ROW (bb) - MIN_ROW (bb) + 1)
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/* Convert a dimensions structure to an integer bounding box, and vice
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versa. */
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extern bounding_box_type dimensions_to_bb (dimensions_type);
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extern dimensions_type bb_to_dimensions (bounding_box_type);
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/* Update the bounding box BB from the point P. */
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extern void update_real_bounding_box (real_bounding_box_type *bb,
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real_coordinate_type p);
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extern void update_bounding_box (bounding_box_type *bb, coordinate_type p);
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#endif /* not BOUNDING_BOX_H */
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