492 lines
9.9 KiB
C
492 lines
9.9 KiB
C
/* rotate by 0/90/180/270 degrees
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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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* 24/3/09
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* - added IM_CODING_RAD support
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* 1/2/10
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* - cleanups
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* - gtkdoc
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* 4/11/11
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* - rewrite as a class
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* 7/3/17
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* - added 90/180/270 convenience functions
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* 10/11/22 alantudyk
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* - swapped memcpy() in d180 for a loop
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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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/*
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#define VIPS_DEBUG
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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 <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <vips/vips.h>
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#include <vips/internal.h>
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#include <vips/debug.h>
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#include "pconversion.h"
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typedef struct _VipsRot {
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VipsConversion parent_instance;
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/* The input image.
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*/
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VipsImage *in;
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/* Rotate by ...
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*/
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VipsAngle angle;
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} VipsRot;
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typedef VipsConversionClass VipsRotClass;
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G_DEFINE_TYPE( VipsRot, vips_rot, VIPS_TYPE_CONVERSION );
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static int
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vips_rot90_gen( VipsRegion *or, void *seq, void *a, void *b,
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gboolean *stop )
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{
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VipsRegion *ir = (VipsRegion *) seq;
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VipsImage *in = (VipsImage *) a;
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/* Output area.
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*/
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VipsRect *r = &or->valid;
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int le = r->left;
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int ri = VIPS_RECT_RIGHT(r);
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int to = r->top;
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int bo = VIPS_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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VipsRect 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( vips_region_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 = VIPS_IMAGE_SIZEOF_PEL( in );
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ls = VIPS_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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VipsPel *q = VIPS_REGION_ADDR( or, le, y );
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/* Corresponding position in ir.
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*/
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VipsPel *p = VIPS_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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static int
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vips_rot180_gen( VipsRegion *or, void *seq, void *a, void *b,
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gboolean *stop )
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{
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VipsRegion *ir = (VipsRegion *) seq;
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VipsImage *in = (VipsImage *) a;
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/* Output area.
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*/
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VipsRect *r = &or->valid;
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int le = r->left;
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int ri = VIPS_RECT_RIGHT(r);
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int to = r->top;
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int bo = VIPS_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;
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/* Find the area of the input image we need.
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*/
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VipsRect need;
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need.left = in->Xsize - ri;
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need.top = in->Ysize - bo;
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need.width = r->width;
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need.height = r->height;
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if( vips_region_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 = VIPS_IMAGE_SIZEOF_PEL( in );
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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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VipsPel *q = VIPS_REGION_ADDR( or, le, y );
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/* Corresponding position in ir.
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*/
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VipsPel *p = VIPS_REGION_ADDR( ir,
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need.left + need.width - 1,
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need.top + need.height - (y - to) - 1 );
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/* Blap across!
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*/
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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 -= ps;
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}
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}
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return( 0 );
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}
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static int
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vips_rot270_gen( VipsRegion *or, void *seq, void *a, void *b,
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gboolean *stop )
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{
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VipsRegion *ir = (VipsRegion *) seq;
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VipsImage *in = (VipsImage *) a;
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/* Output area.
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*/
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VipsRect *r = &or->valid;
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int le = r->left;
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int ri = VIPS_RECT_RIGHT(r);
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int to = r->top;
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int bo = VIPS_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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VipsRect need;
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need.left = in->Xsize - bo;
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need.top = le;
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need.width = r->height;
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need.height = r->width;
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if( vips_region_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 = VIPS_IMAGE_SIZEOF_PEL( in );
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ls = VIPS_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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VipsPel *q = VIPS_REGION_ADDR( or, le, y );
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/* Corresponding position in ir.
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*/
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VipsPel *p = VIPS_REGION_ADDR( ir,
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need.left + need.width - (y - to) - 1,
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need.top );
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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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static int
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vips_rot_build( VipsObject *object )
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{
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VipsConversion *conversion = VIPS_CONVERSION( object );
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VipsRot *rot = (VipsRot *) object;
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VipsGenerateFn generate_fn;
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VipsDemandStyle hint;
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if( VIPS_OBJECT_CLASS( vips_rot_parent_class )->build( object ) )
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return( -1 );
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if( rot->angle == VIPS_ANGLE_D0 )
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return( vips_image_write( rot->in, conversion->out ) );
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if( vips_image_pio_input( rot->in ) )
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return( -1 );
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hint = rot->angle == VIPS_ANGLE_D180 ?
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VIPS_DEMAND_STYLE_THINSTRIP :
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VIPS_DEMAND_STYLE_SMALLTILE;
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if( vips_image_pipelinev( conversion->out, hint, rot->in, NULL ) )
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return( -1 );
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switch( rot->angle ) {
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case VIPS_ANGLE_D90:
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generate_fn = vips_rot90_gen;
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conversion->out->Xsize = rot->in->Ysize;
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conversion->out->Ysize = rot->in->Xsize;
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conversion->out->Xoffset = rot->in->Ysize;
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conversion->out->Yoffset = 0;
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break;
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case VIPS_ANGLE_D180:
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generate_fn = vips_rot180_gen;
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conversion->out->Xoffset = rot->in->Xsize;
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conversion->out->Yoffset = rot->in->Ysize;
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break;
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case VIPS_ANGLE_D270:
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generate_fn = vips_rot270_gen;
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conversion->out->Xsize = rot->in->Ysize;
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conversion->out->Ysize = rot->in->Xsize;
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conversion->out->Xoffset = 0;
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conversion->out->Yoffset = rot->in->Xsize;
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break;
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default:
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g_assert_not_reached();
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/* Stop compiler warnings.
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*/
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generate_fn = NULL;
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}
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if( vips_image_generate( conversion->out,
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vips_start_one, generate_fn, vips_stop_one,
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rot->in, rot ) )
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return( -1 );
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return( 0 );
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}
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static void
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vips_rot_class_init( VipsRotClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
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VIPS_DEBUG_MSG( "vips_rot_class_init\n" );
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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vobject_class->nickname = "rot";
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vobject_class->description = _( "rotate an image" );
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vobject_class->build = vips_rot_build;
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VIPS_ARG_IMAGE( class, "in", 1,
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_( "Input" ),
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_( "Input image" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsRot, in ) );
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VIPS_ARG_ENUM( class, "angle", 6,
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_( "Angle" ),
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_( "Angle to rotate image" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsRot, angle ),
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VIPS_TYPE_ANGLE, VIPS_ANGLE_D90 );
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}
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static void
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vips_rot_init( VipsRot *rot )
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{
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}
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static int
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vips_rotv( VipsImage *in, VipsImage **out, VipsAngle angle, va_list ap )
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{
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return( vips_call_split( "rot", ap, in, out, angle ) );
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}
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/**
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* vips_rot: (method)
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* @in: input image
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* @out: (out): output image
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* @angle: rotation angle
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* @...: %NULL-terminated list of optional named arguments
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*
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* Rotate @in by a multiple of 90 degrees.
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*
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* Use vips_similarity() to rotate by an arbitary angle. vips_rot45() is
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* useful for rotating convolution masks by 45 degrees.
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*
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* See also: vips_flip(), vips_similarity(), vips_rot45().
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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vips_rot( VipsImage *in, VipsImage **out, VipsAngle angle, ... )
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{
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va_list ap;
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int result;
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va_start( ap, angle );
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result = vips_rotv( in, out, angle, ap );
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va_end( ap );
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return( result );
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}
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/**
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* vips_rot90:
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* @in: input image
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* @out: output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* Rotate @in by 90 degress clockwise. A convenience function over vips_rot().
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*
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* See also: vips_rot().
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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vips_rot90( VipsImage *in, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_rotv( in, out, VIPS_ANGLE_D90, ap );
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va_end( ap );
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return( result );
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}
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/**
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* vips_rot180: (method)
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* @in: input image
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* @out: (out): output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* Rotate @in by 180 degress. A convenience function over vips_rot().
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*
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* See also: vips_rot().
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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vips_rot180( VipsImage *in, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_rotv( in, out, VIPS_ANGLE_D180, ap );
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va_end( ap );
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return( result );
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}
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/**
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* vips_rot270: (method)
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* @in: input image
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* @out: (out): output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* Rotate @in by 270 degress clockwise. A convenience function over vips_rot().
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*
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* See also: vips_rot().
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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vips_rot270( VipsImage *in, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_rotv( in, out, VIPS_ANGLE_D270, ap );
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va_end( ap );
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return( result );
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}
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