166 lines
3.4 KiB
C
166 lines
3.4 KiB
C
/* @(#) rotates an image 90 degrees
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* @(#) Usage:
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* @(#) im_rot90(in, out)
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* @(#) IMAGE *in, *out;
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* @(#)
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* @(#) Returns 0 on sucess and -1 on error
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* @(#)
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* Copyright: 1991, N. Dessipris
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* Written on: 28/10/91
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* Updated on: 2/4/92, J.Cupitt
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* bugs in im_la90rot fixed, now works for any type.
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* 19/7/93 JC
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* - IM_CODING_LABQ allowed now
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* 15/11/94 JC
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* - name changed
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* - memory leaks fixed
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* 8/2/95 JC
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* - oops! memory allocation problem fixed
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* 18/5/95 JC
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* - IM_MAXLINES increased
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* 13/8/96 JC
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* - rewritten for partials
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* 6/11/02 JC
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* - speed-up ... replace memcpy() with a loop for small pixels
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* 14/4/04
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* - sets Xoffset / Yoffset
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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 <string.h>
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#include <vips/vips.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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/* Rotate a small piece.
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*/
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static int
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rot90_gen( REGION *or, void *seq, void *a, void *b )
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{
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REGION *ir = (REGION *) seq;
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IMAGE *in = (IMAGE *) a;
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/* Output area.
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*/
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Rect *r = &or->valid;
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int le = r->left;
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int ri = IM_RECT_RIGHT(r);
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int to = r->top;
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int bo = IM_RECT_BOTTOM(r);
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int x, y, i;
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/* Pixel geometry.
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*/
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int ps, ls;
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/* Find the area of the input image we need.
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*/
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Rect need;
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need.left = to;
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need.top = in->Ysize - ri;
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need.width = r->height;
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need.height = r->width;
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if( im_prepare( ir, &need ) )
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return( -1 );
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/* Find PEL size and line skip for ir.
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*/
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ps = IM_IMAGE_SIZEOF_PEL( in );
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ls = IM_REGION_LSKIP( ir );
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/* Rotate the bit we now have.
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*/
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for( y = to; y < bo; y++ ) {
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/* Start of this output line.
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*/
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PEL *q = (PEL *) IM_REGION_ADDR( or, le, y );
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/* Corresponding position in ir.
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*/
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PEL *p = (PEL *) IM_REGION_ADDR( ir,
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need.left + y - to,
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need.top + need.height - 1 );
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for( x = le; x < ri; x++ ) {
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for( i = 0; i < ps; i++ )
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q[i] = p[i];
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q += ps;
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p -= ls;
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}
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}
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return( 0 );
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}
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int
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im_rot90( IMAGE *in, IMAGE *out )
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{
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/* Make output image.
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*/
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if( im_piocheck( in, out ) )
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return( -1 );
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if( in->Coding != IM_CODING_NONE && in->Coding != IM_CODING_LABQ ) {
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im_error( "im_rot90", _( "uncoded or IM_CODING_LABQ only" ) );
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return( -1 );
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}
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if( im_cp_desc( out, in ) )
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return( -1 );
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out->Xsize = in->Ysize;
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out->Ysize = in->Xsize;
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/* We want smalltile if possible.
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*/
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if( im_demand_hint( out, IM_SMALLTILE, in, NULL ) )
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return( -1 );
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/* Generate!
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*/
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if( im_generate( out,
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im_start_one, rot90_gen, im_stop_one, in, NULL ) )
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return( -1 );
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out->Xoffset = in->Ysize;
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out->Yoffset = 0;
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return( 0 );
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}
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