253 lines
5.9 KiB
C
253 lines
5.9 KiB
C
/* Swap image byte order.
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*
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* 5/6/15
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* - from copy.c
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* 27/1/16
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* - don't swap coded images
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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 <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 <math.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 _VipsByteswap {
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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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} VipsByteswap;
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typedef VipsConversionClass VipsByteswapClass;
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G_DEFINE_TYPE( VipsByteswap, vips_byteswap, VIPS_TYPE_CONVERSION );
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/* Swap pairs of bytes.
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*/
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static void
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vips_byteswap_swap2( VipsPel *in, VipsPel *out, int width, VipsImage *im )
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{
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guint16 *p = (guint16 *) in;
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guint16 *q = (guint16 *) out;
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int sz = (VIPS_IMAGE_SIZEOF_PEL( im ) * width) / 2;
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int x;
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for( x = 0; x < sz; x++ )
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q[x] = GUINT16_SWAP_LE_BE( p[x] );
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}
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/* Swap 4- of bytes.
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*/
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static void
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vips_byteswap_swap4( VipsPel *in, VipsPel *out, int width, VipsImage *im )
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{
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guint32 *p = (guint32 *) in;
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guint32 *q = (guint32 *) out;
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int sz = (VIPS_IMAGE_SIZEOF_PEL( im ) * width) / 4;
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int x;
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for( x = 0; x < sz; x++ )
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q[x] = GUINT32_SWAP_LE_BE( p[x] );
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}
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/* Swap 8- of bytes.
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*/
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static void
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vips_byteswap_swap8( VipsPel *in, VipsPel *out, int width, VipsImage *im )
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{
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guint64 *p = (guint64 *) in;
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guint64 *q = (guint64 *) out;
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int sz = (VIPS_IMAGE_SIZEOF_PEL( im ) * width) / 8;
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int x;
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for( x = 0; x < sz; x++ )
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q[x] = GUINT64_SWAP_LE_BE( p[x] );
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}
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typedef void (*SwapFn)( VipsPel *in, VipsPel *out, int width, VipsImage *im );
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static SwapFn vips_byteswap_swap_fn[] = {
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NULL, /* VIPS_FORMAT_UCHAR = 0, */
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NULL, /* VIPS_FORMAT_CHAR = 1, */
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vips_byteswap_swap2, /* VIPS_FORMAT_USHORT = 2, */
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vips_byteswap_swap2, /* VIPS_FORMAT_SHORT = 3, */
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vips_byteswap_swap4, /* VIPS_FORMAT_UINT = 4, */
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vips_byteswap_swap4, /* VIPS_FORMAT_INT = 5, */
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vips_byteswap_swap4, /* VIPS_FORMAT_FLOAT = 6, */
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vips_byteswap_swap4, /* VIPS_FORMAT_COMPLEX = 7, */
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vips_byteswap_swap8, /* VIPS_FORMAT_DOUBLE = 8, */
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vips_byteswap_swap8 /* VIPS_FORMAT_DPCOMPLEX = 9, */
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};
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/* Byteswap, turning bands into the x axis.
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*/
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static int
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vips_byteswap_gen( VipsRegion *or,
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void *seq, void *a, void *b, gboolean *stop )
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{
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VipsRegion *ir = (VipsRegion *) seq;
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VipsImage *im = ir->im;
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VipsRect *r = &or->valid;
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SwapFn swap = vips_byteswap_swap_fn[im->BandFmt];
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int y;
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g_assert( swap );
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if( vips_region_prepare( ir, r ) )
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return( -1 );
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for( y = 0; y < r->height; y++ ) {
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VipsPel *p = VIPS_REGION_ADDR( ir, r->left, r->top + y );
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VipsPel *q = VIPS_REGION_ADDR( or, r->left, r->top + y );
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swap( p, q, r->width, im );
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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_byteswap_build( VipsObject *object )
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{
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VipsConversion *conversion = VIPS_CONVERSION( object );
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VipsByteswap *byteswap = (VipsByteswap *) object;
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if( VIPS_OBJECT_CLASS( vips_byteswap_parent_class )->build( object ) )
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return( -1 );
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/* Lots of images don't need swapping.
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*/
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if( byteswap->in->Coding != VIPS_CODING_NONE ||
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!vips_byteswap_swap_fn[byteswap->in->BandFmt] )
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return( vips_image_write( byteswap->in, conversion->out ) );
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if( vips_image_pio_input( byteswap->in ) )
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return( -1 );
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if( vips_image_pipelinev( conversion->out,
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VIPS_DEMAND_STYLE_THINSTRIP, byteswap->in, NULL ) )
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return( -1 );
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if( vips_image_generate( conversion->out,
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vips_start_one, vips_byteswap_gen, vips_stop_one,
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byteswap->in, byteswap ) )
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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_byteswap_class_init( VipsByteswapClass *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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VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
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VIPS_DEBUG_MSG( "vips_byteswap_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 = "byteswap";
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vobject_class->description = _( "byteswap an image" );
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vobject_class->build = vips_byteswap_build;
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operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
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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( VipsByteswap, in ) );
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}
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static void
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vips_byteswap_init( VipsByteswap *byteswap )
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{
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}
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/**
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* vips_byteswap: (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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* Swap the byte order in an image.
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*
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* See also: vips_rawload().
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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_byteswap( 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_call_split( "byteswap", ap, in, out );
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va_end( ap );
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return( result );
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}
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/* Convenience function: swap if @swap is %TRUE, otherwise copy.
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*/
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int
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vips__byteswap_bool( VipsImage *in, VipsImage **out, gboolean swap )
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{
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if( swap )
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return( vips_byteswap( in, out, NULL ) );
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else
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return( vips_copy( in, out, NULL ) );
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}
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