424 lines
8.7 KiB
C
424 lines
8.7 KiB
C
/* draw straight lines
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*
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* Copyright: J. Cupitt
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* Written: 15/06/1992
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* Modified : 22/10/92 - clipping constraints changed
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* 22/7/93 JC
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* - im_incheck() added
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* 16/8/94 JC
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* - im_incheck() changed to im_makerw()
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* 5/12/06
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* - im_invalidate() after paint
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* 1/3/10
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* - oops, lineset needs to ask for WIO of mask and ink
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* 6/3/10
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* - don't im_invalidate() after paint, this now needs to be at a higher
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* level
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* 27/9/10
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* - gtk-doc
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* - use draw.c base class
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* - do pointwise clipping
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* - rename as im_draw_line() for consistency
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* - cleanups!
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <vips/vips.h>
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#include "draw.h"
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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#define SWAP(A,B) {int t; t = (A); (A) = (B); (B) = t;}
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typedef struct _Line {
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Draw draw;
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int x1, y1;
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int x2, y2;
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int dx;
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int dy;
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VipsPlotFn plot;
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void *a;
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void *b;
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void *c;
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} Line;
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static void
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line_free( Line *line )
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{
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im__draw_free( DRAW( line ) );
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im_free( line );
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}
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static Line *
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line_new( VipsImage *im, int x1, int y1, int x2, int y2, PEL *ink )
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{
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Line *line;
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if( !(line = IM_NEW( NULL, Line )) )
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return( NULL );
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if( !im__draw_init( DRAW( line ), im, ink ) ) {
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line_free( line );
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return( NULL );
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}
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/* Find offsets.
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*/
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line->dx = x2 - x1;
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line->dy = y2 - y1;
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/* Swap endpoints to reduce number of cases.
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*/
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if( abs( line->dx ) >= abs( line->dy ) && line->dx < 0 ) {
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/* Swap to get all x greater or equal cases going to the
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* right. Do diagonals here .. just have up and right and down
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* and right now.
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*/
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SWAP( x1, x2 );
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SWAP( y1, y2 );
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}
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else if( abs( line->dx ) < abs( line->dy ) && line->dy < 0 ) {
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/* Swap to get all y greater cases going down the screen.
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*/
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SWAP( x1, x2 );
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SWAP( y1, y2 );
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}
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/* Recalculate dx, dy.
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*/
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line->dx = x2 - x1;
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line->dy = y2 - y1;
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line->x1 = x1;
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line->y1 = y1;
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line->x2 = x2;
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line->y2 = y2;
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line->plot = NULL;
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line->a = NULL;
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line->b = NULL;
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line->c = NULL;
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if( x1 < im->Xsize && x1 >= 0 &&
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x2 < im->Xsize && x2 >= 0 &&
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y1 < im->Ysize && y1 >= 0 &&
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y2 < im->Ysize && y2 >= 0 )
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DRAW( line )->noclip = TRUE;
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return( line );
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}
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static inline int
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line_plot( Line *line, int x, int y )
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{
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return( line->plot( DRAW( line )->im, x, y,
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line->a, line->b, line->c ) );
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}
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static int
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line_draw( Line *line )
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{
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int x, y, err;
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/* Start point and offset.
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*/
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x = line->x1;
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y = line->y1;
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/* Special case: zero width and height is single point.
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*/
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if( line->dx == 0 && line->dy == 0 ) {
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if( line_plot( line, x, y ) )
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return( -1 );
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}
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/* Special case vertical and horizontal lines for speed.
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*/
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else if( line->dx == 0 ) {
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/* Vertical line going down.
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*/
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for( ; y <= line->y2; y++ ) {
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if( line_plot( line, x, y ) )
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return( -1 );
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}
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}
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else if( line->dy == 0 ) {
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/* Horizontal line to the right.
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*/
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for( ; x <= line->x2; x++ ) {
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if( line_plot( line, x, y ) )
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return( -1 );
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}
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}
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/* Special case diagonal lines.
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*/
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else if( abs( line->dy ) == abs( line->dx ) && line->dy > 0 ) {
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/* Diagonal line going down and right.
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*/
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for( ; x <= line->x2; x++, y++ ) {
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if( line_plot( line, x, y ) )
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return( -1 );
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}
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}
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else if( abs( line->dy ) == abs( line->dx ) && line->dy < 0 ) {
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/* Diagonal line going up and right.
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*/
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for( ; x <= line->x2; x++, y-- ) {
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if( line_plot( line, x, y ) )
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return( -1 );
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}
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}
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else if( abs( line->dy ) < abs( line->dx ) && line->dy > 0 ) {
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/* Between -45 and 0 degrees.
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*/
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for( err = 0; x <= line->x2; x++ ) {
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if( line_plot( line, x, y ) )
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return( -1 );
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err += line->dy;
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if( err >= line->dx ) {
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err -= line->dx;
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y++;
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}
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}
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}
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else if( abs( line->dy ) < abs( line->dx ) && line->dy < 0 ) {
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/* Between 0 and 45 degrees.
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*/
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for( err = 0; x <= line->x2; x++ ) {
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if( line_plot( line, x, y ) )
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return( -1 );
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err -= line->dy;
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if( err >= line->dx ) {
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err -= line->dx;
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y--;
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}
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}
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}
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else if( abs( line->dy ) > abs( line->dx ) && line->dx > 0 ) {
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/* Between -45 and -90 degrees.
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*/
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for( err = 0; y <= line->y2; y++ ) {
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if( line_plot( line, x, y ) )
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return( -1 );
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err += line->dx;
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if( err >= line->dy ) {
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err -= line->dy;
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x++;
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}
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}
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}
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else if( abs( line->dy ) > abs( line->dx ) && line->dx < 0 ) {
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/* Between -90 and -135 degrees.
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*/
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for( err = 0; y <= line->y2; y++ ) {
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if( line_plot( line, x, y ) )
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return( -1 );
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err -= line->dx;
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if( err >= line->dy ) {
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err -= line->dy;
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x--;
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}
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}
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}
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else
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g_assert( 0 );
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return( 0 );
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}
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/**
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* im_draw_line_user:
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* @im: image to draw on
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* @x1: start point
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* @y1: start point
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* @x2: end point
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* @y2: end point
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* @ink: value to draw
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*
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* Draws a 1-pixel-wide line on an image. @x1, @y1 and @x2, @y2 must be
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* within the image.
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*
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* @ink is an array of bytes
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* containing a valid pixel for the image's format.
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* It must have at least IM_IMAGE_SIZEOF_PEL( @im ) bytes.
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*
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* See also: im_draw_circle().
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*
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* Returns: 0 on success, or -1 on error.
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*/
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/* Draw a line on a image with a user plot function. We do no clipping: the
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* user function should check ranges for each pixel when it is called.
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*/
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int
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im_draw_line_user( VipsImage *im,
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int x1, int y1, int x2, int y2,
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VipsPlotFn plot, void *a, void *b, void *c )
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{
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Line *line;
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if( im_check_coding_known( "im_draw_line", im ) ||
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!(line = line_new( im, x1, y1, x2, y2, NULL )) )
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return( -1 );
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line->plot = plot;
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line->a = a;
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line->b = b;
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line->c = c;
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if( line_draw( line ) ) {
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line_free( line );
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return( -1 );
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}
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line_free( line );
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return( 0 );
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}
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static int
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line_plot_point( VipsImage *im, int x, int y,
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void *a, void *b, void *c )
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{
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Draw *draw = (Draw *) a;
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if( draw->noclip )
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im__draw_pel( draw, (PEL *) IM_IMAGE_ADDR( draw->im, x, y ) );
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else
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im__draw_pel_clip( draw, x, y );
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return( 0 );
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}
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/**
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* im_draw_line:
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* @im: image to draw on
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* @x1: start point
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* @y1: start point
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* @x2: end point
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* @y2: end point
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* @ink: value to draw
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*
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* Draws a 1-pixel-wide line on an image.
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*
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* @ink is an array of bytes
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* containing a valid pixel for the image's format.
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* It must have at least IM_IMAGE_SIZEOF_PEL( @im ) bytes.
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*
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* See also: im_draw_circle().
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*
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* Returns: 0 on success, or -1 on error.
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*/
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int
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im_draw_line( VipsImage *im, int x1, int y1, int x2, int y2, PEL *ink )
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{
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Line *line;
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if( im_check_coding_known( "im_draw_line", im ) ||
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!(line = line_new( im, x1, y1, x2, y2, ink )) )
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return( -1 );
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line->plot = line_plot_point;
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line->a = line;
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if( line_draw( line ) ) {
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line_free( line );
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return( 0 );
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}
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line_free( line );
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return( 0 );
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}
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/* Draw a set of lines with an ink and a mask. A non-inplace operation, handy
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* for nip2.
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*/
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int
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im_lineset( IMAGE *in, IMAGE *out, IMAGE *mask, IMAGE *ink,
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int n, int *x1v, int *y1v, int *x2v, int *y2v )
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{
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Rect mask_rect;
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int i;
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if( mask->Bands != 1 || mask->BandFmt != IM_BANDFMT_UCHAR ||
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mask->Coding != IM_CODING_NONE ) {
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im_error( "im_lineset",
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"%s", _( "mask image not 1 band 8 bit uncoded" ) );
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return( -1 );
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}
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if( ink->Bands != in->Bands || ink->BandFmt != in->BandFmt ||
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ink->Coding != in->Coding ) {
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im_error( "im_lineset",
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"%s", _( "ink image does not match in image" ) );
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return( -1 );
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}
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if( ink->Xsize != 1 || ink->Ysize != 1 ) {
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im_error( "im_lineset", "%s", _( "ink image not 1x1 pixels" ) );
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return( -1 );
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}
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/* Copy the image then fastline to it ... this will render to a "t"
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* usually.
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*/
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if( im_copy( in, out ) )
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return( -1 );
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mask_rect.left = mask->Xsize / 2;
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mask_rect.top = mask->Ysize / 2;
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mask_rect.width = mask->Xsize;
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mask_rect.height = mask->Ysize;
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if( im_incheck( ink ) ||
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im_incheck( mask ) )
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return( -1 );
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for( i = 0; i < n; i++ ) {
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if( im_fastlineuser( out, x1v[i], y1v[i], x2v[i], y2v[i],
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im_plotmask, ink->data, mask->data, &mask_rect ) )
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return( -1 );
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}
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return( 0 );
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}
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