69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* pxl-outline.h: find a list of outlines which make up one character.
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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 PXL_OUTLINE_H
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#define PXL_OUTLINE_H
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#include "types.h"
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/* This is a list of contiguous points on the bitmap. */
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typedef struct
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{
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coordinate_type *data;
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unsigned length;
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boolean clockwise;
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} pixel_outline_type;
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/* The Nth coordinate in the list. */
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#define O_COORDINATE(p_o, n) ((p_o).data[n])
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/* The length of the list. */
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#define O_LENGTH(p_o) ((p_o).length)
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/* Whether the outline moves clockwise or counterclockwise. */
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#define O_CLOCKWISE(p_o) ((p_o).clockwise)
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/* Since a pixel outline is cyclic, the index of the next coordinate
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after the last is the first, and the previous coordinate before the
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first is the last. */
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#define O_NEXT(p_o, n) (((n) + 1) % O_LENGTH (p_o))
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#define O_PREV(p_o, n) ((n) == 0 ? O_LENGTH (p_o) - 1 : (n) - 1)
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/* And the character turns into a list of such lists. */
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typedef struct
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{
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pixel_outline_type *data;
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unsigned length;
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} pixel_outline_list_type;
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/* The Nth list in the list of lists. */
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#define O_LIST_OUTLINE(p_o_l, n) ((p_o_l).data[n])
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/* The length of the list of lists. */
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#define O_LIST_LENGTH(p_o_l) ((p_o_l).length)
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/* Find all pixels on the outline in the character C. */
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extern pixel_outline_list_type find_outline_pixels (void);
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/* Free the memory in the list. */
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extern void free_pixel_outline_list (pixel_outline_list_type *);
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#endif /* not PXL_OUTLINE_H */
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