| /* @(#) Read a pel out of an image and into a buffer, plot a pel back into |
| * @(#) the image again. |
| * @(#) |
| * @(#) int |
| * @(#) im_readpoint( IMAGE *im, int x, int y, PEL *ink ) |
| * @(#) |
| * @(#) int |
| * @(#) im_plotpoint( IMAGE *im, int x, int y, PEL *ink ) |
| * @(#) |
| * |
| * Copyright: J. Cupitt |
| * Written: 15/06/1992 |
| * 22/7/93 JC |
| * - im_incheck() added |
| * 16/8/94 JC |
| * - im_incheck() changed to im_makerw() |
| * 5/12/06 |
| * - im_invalidate() after paint |
| * 6/3/10 |
| * - don't im_invalidate() after paint, this now needs to be at a higher |
| * level |
| */ |
| |
| /* |
| |
| This file is part of VIPS. |
| |
| VIPS is free software; you can redistribute it and/or modify |
| it under the terms of the GNU Lesser 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 Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser 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 |
| |
| */ |
| |
| /* |
| |
| These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk |
| |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif /*HAVE_CONFIG_H*/ |
| #include <vips/intl.h> |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include <vips/vips.h> |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| /* Read a colour from an image. |
| */ |
| int |
| im_readpoint( IMAGE *im, int x, int y, PEL *pel ) |
| { |
| int es = IM_IMAGE_SIZEOF_ELEMENT( im ); |
| int ps = es * im->Bands; |
| int ls = ps * im->Xsize; |
| int b; |
| PEL *from; |
| |
| if( im_rwcheck( im ) ) |
| return( -1 ); |
| |
| /* Check coordinates in range. |
| */ |
| if( x > im->Xsize || x < 0 || y > im->Ysize || y < 0 ) { |
| im_error( "im_readpoint", "%s", _( "invalid cooordinates" ) ); |
| return( 1 ); |
| } |
| |
| /* Suck single pixel. |
| */ |
| from = (PEL *) im->data + x * ps + y * ls; |
| for( b = 0; b < ps; b++ ) |
| *pel++ = *from++; |
| |
| return( 0 ); |
| } |
| |
| /* Plot a point in an image. |
| */ |
| int |
| im_plotpoint( IMAGE *im, int x, int y, PEL *pel ) |
| { |
| int es = IM_IMAGE_SIZEOF_ELEMENT( im ); |
| int ps = es * im->Bands; |
| int ls = ps * im->Xsize; |
| int b; |
| PEL *to; |
| |
| if( im_rwcheck( im ) ) |
| return( -1 ); |
| |
| /* Check coordinates in range. |
| */ |
| if( x > im->Xsize || x < 0 || y > im->Ysize || y < 0 ) |
| return( 0 ); |
| |
| /* Paint single pixel. |
| */ |
| to = (PEL *) im->data + x * ps + y * ls; |
| for( b = 0; b < ps; b++ ) |
| *to++ = *pel++; |
| |
| return( 0 ); |
| } |
