gimp/app/airbrush_blob.h

154 lines
3.4 KiB
C

/* airbrush_blob.h: routines for manipulating scan converted convex
* polygons.
*
* Copyright 1998, Owen Taylor <otaylor@gtk.org>
*
* > Please contact the above author before modifying the copy <
* > of this file in the GIMP distribution. Thanks. <
*
* 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 of the License, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#ifndef __AIRBRUSHBLOB_H__
#define __AIRBRUSHBLOB_H__
typedef enum {
CROSS = 0,
CROSS_LEFT = 1,
CROSS_RIGHT = 2,
CROSS_WHOLE_LINE = 3,
CROSS_NORMAL = 4
} CrossType;
typedef enum {
RIGHT_LEFT = 0,
LEFT_RIGHT = 1,
TOP_BOT = 2,
BOT_TOP = 3,
NONE = 4
} MoveType;
/* The AirBlob, which is a abstract of a real AirBrushBlob */
typedef struct _AirBlob AirBlob;
typedef struct _AirPoint AirPoint;
typedef struct _SupportLine SupportLine;
struct _AirPoint {
int x;
int y;
};
struct _SupportLine {
double size;
double dist;
};
struct _AirBlob {
double direction_abs;
double direction;
double ycenter;
double xcenter;
SupportLine main_line;
SupportLine minor_line;
SupportLine maincross_line;
SupportLine minorcross_line;
};
/* The AirLine is a reslut of a AirBlob */
typedef struct _AirLine AirLine;
struct _AirLine {
int xcenter;
int ycenter;
AirPoint line[16];
int min_x, min_y;
int max_x, max_y;
int width, height;
int nlines;
};
typedef struct _AirBrushBlobPoint AirBrushBlobPoint;
typedef struct _AirBrushBlobSpan AirBrushBlobSpan;
typedef struct _AirBrushBlob AirBrushBlob;
struct _AirBrushBlobPoint {
int x;
int y;
};
struct _AirBrushBlobSpan {
int left;
double angle_left;
double angle_left_abs;
double dist_left;
int right;
double angle_right;
double angle_right_abs;
double dist_right;
CrossType cross_type;
int x_cross;
int center;
double dist;
};
struct _AirBrushBlob {
int y;
int height;
int width;
int min_x;
int max_x;
MoveType move;
double direction_abs;
double direction;
CrossType cross;
AirBrushBlobSpan data[1];
};
typedef struct _AirBrush AirBrush;
struct _AirBrush {
AirBrushBlob airbrush_blob;
AirBlob airblob;
};
AirBlob *create_air_blob (double xc, double yc, double xt, double yt, double xr, double yr, double xb, double yb, double xl, double yl, double direction_abs, double direction);
AirBlob *trans_air_blob(AirBlob *airblob_last, AirBlob *airblob_present, double dist, int xc, int yc);
AirLine *create_air_line(AirBlob *airblob);
AirBrushBlob *airbrush_blob_convex_union (AirBrushBlob *b1, AirBrushBlob *b2);
AirBrushBlob *airbrush_blob_ellipse (double xc, double yc, double xt, double yt, double xr, double yr, double xb, double yb, double xl, double yl);
void airbrush_blob_bounds (AirBrushBlob *b, int *x, int *y, int *width, int *height);
#endif /* __AIRBRUSHBLOB_H__ */