mirror of https://github.com/GNOME/gimp.git
113 lines
4.3 KiB
C
113 lines
4.3 KiB
C
/* bitmap.h: definition for a bitmap type. No packing is done by
|
||
default; each pixel is represented by an entire byte. Among other
|
||
things, this means the type can be used for both grayscale and binary
|
||
images.
|
||
|
||
Copyright (C) 1992 Free Software Foundation, Inc.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2, or (at your option)
|
||
any later version.
|
||
|
||
This program 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 General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#ifndef BITMAP_H
|
||
#define BITMAP_H
|
||
|
||
#include <stdio.h>
|
||
#include "bounding-box.h"
|
||
#include "types.h"
|
||
|
||
|
||
/* If the bitmap holds 8-bit values, rather than one-bit, the
|
||
definition of BLACK here is wrong. So don't use it in that case! */
|
||
#define WHITE 0
|
||
#define BLACK 1
|
||
|
||
|
||
/* The basic structure and macros to access it. */
|
||
typedef struct
|
||
{
|
||
dimensions_type dimensions;
|
||
one_byte *bitmap;
|
||
} bitmap_type;
|
||
|
||
/* The dimensions of the bitmap, in pixels. */
|
||
#define BITMAP_DIMENSIONS(b) ((b).dimensions)
|
||
|
||
/* The pixels, represented as an array of bytes (in contiguous storage).
|
||
Each pixel is a single byte, even for binary fonts. */
|
||
#define BITMAP_BITS(b) ((b).bitmap)
|
||
|
||
/* These are convenient abbreviations for geting inside the members. */
|
||
#define BITMAP_WIDTH(b) DIMENSIONS_WIDTH (BITMAP_DIMENSIONS (b))
|
||
#define BITMAP_HEIGHT(b) DIMENSIONS_HEIGHT (BITMAP_DIMENSIONS (b))
|
||
|
||
/* This is the address of the first pixel in the row ROW. */
|
||
#define BITMAP_ROW(b, row) (BITMAP_BITS (b) + (row) * BITMAP_WIDTH (b))
|
||
|
||
/* This is the pixel at [ROW,COL]. */
|
||
#define BITMAP_PIXEL(b, row, col) \
|
||
(*(BITMAP_BITS (b) + (row) * BITMAP_WIDTH (b) + (col)))
|
||
|
||
#define BITMAP_VALID_PIXEL(b, row, col) \
|
||
(0 <= (row) && (row) < BITMAP_HEIGHT (b) \
|
||
&& 0 <= (col) && (col) < BITMAP_WIDTH (b))
|
||
|
||
/* Assume that the pixel at [ROW,COL] itself is black. */
|
||
|
||
#define BITMAP_INTERIOR_PIXEL(b, row, col) \
|
||
(0 != (row) && (row) != BITMAP_HEIGHT (b) - 1 \
|
||
&& 0 != (col) && (col) != BITMAP_WIDTH (b) - 1 \
|
||
&& BITMAP_PIXEL (b, row - 1, col - 1) == BLACK \
|
||
&& BITMAP_PIXEL (b, row - 1, col) == BLACK \
|
||
&& BITMAP_PIXEL (b, row - 1, col + 1) == BLACK \
|
||
&& BITMAP_PIXEL (b, row, col - 1) == BLACK \
|
||
&& BITMAP_PIXEL (b, row, col + 1) == BLACK \
|
||
&& BITMAP_PIXEL (b, row + 1, col - 1) == BLACK \
|
||
&& BITMAP_PIXEL (b, row + 1, col) == BLACK \
|
||
&& BITMAP_PIXEL (b, row + 1, col + 1) == BLACK)
|
||
|
||
/* Allocate storage for the bits, set them all to white, and return an
|
||
initialized structure. */
|
||
extern bitmap_type new_bitmap (dimensions_type);
|
||
|
||
/* Free that storage. */
|
||
extern void free_bitmap (bitmap_type *);
|
||
|
||
/* Make a fresh copy of BITMAP in a new structure, and return it. */
|
||
extern bitmap_type copy_bitmap (bitmap_type bitmap);
|
||
|
||
/* Return the pixels in the bitmap B enclosed by the bounding box BB.
|
||
The result is put in newly allocated storage. */
|
||
extern bitmap_type extract_subbitmap (bitmap_type b, bounding_box_type bb);
|
||
|
||
/* Consider the dimensions of a bitmap as a bounding box. The bounding
|
||
box returned is in bitmap coordinates, rather than Cartesian, and
|
||
refers to pixels, rather than edges. Specifically, this means that
|
||
the maximum column is one less than results from `dimensions_to_bb
|
||
(BITMAP_DIMENSIONS ())'. */
|
||
extern bounding_box_type bitmap_to_bb (const bitmap_type);
|
||
|
||
/* Return a vector of zero-based column numbers marking transitions from
|
||
black to white or white to black in ROW, which is of length WIDTH.
|
||
The end of the vector is marked with an element of length WIDTH + 1.
|
||
The first element always marks a white-to-black transition (or it's
|
||
0, if the first pixel in ROW is black). */
|
||
extern unsigned *bitmap_find_transitions (const one_byte *row, unsigned width);
|
||
|
||
/* Print part of or all of a bitmap. */
|
||
extern void print_bounded_bitmap (FILE *, bitmap_type, bounding_box_type);
|
||
extern void print_bitmap (FILE *, bitmap_type);
|
||
|
||
#endif /* not BITMAP_H */
|
||
|