227 lines
5.2 KiB
C
227 lines
5.2 KiB
C
/* vips_transpose3d
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*
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* 30/4/18
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* - from grid.c
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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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#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 <stdlib.h>
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#include <string.h>
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#include <vips/vips.h>
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#include "pconversion.h"
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typedef struct _VipsTranspose3d {
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VipsConversion parent_instance;
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VipsImage *in;
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int page_height;
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} VipsTranspose3d;
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typedef VipsConversionClass VipsTranspose3dClass;
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G_DEFINE_TYPE( VipsTranspose3d, vips_transpose3d, VIPS_TYPE_CONVERSION );
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static int
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vips_transpose3d_gen( VipsRegion *or, void *vseq, void *a, void *b,
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gboolean *stop )
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{
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VipsRegion *ir = (VipsRegion *) vseq;
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VipsImage *in = (VipsImage *) a;
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VipsTranspose3d *transpose3d = (VipsTranspose3d *) b;
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VipsRect *r = &or->valid;
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int output_page_height = in->Ysize / transpose3d->page_height;
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int y;
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VipsRect tile;
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tile = *r;
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tile.height = 1;
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for( y = 0; y < r->height; y++ ) {
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/* y in output.
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*/
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int yo = r->top + y;
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/* On output page.
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*/
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int yop = yo / output_page_height;
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/* Line on output page.
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*/
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int yol = yo % output_page_height;
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/* y of input page.
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*/
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int yip = yol * transpose3d->page_height;
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/* y of input line.
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*/
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int yi = yip + yop;
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tile.top = yi;
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/* Render into or.
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*/
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if( vips_region_prepare_to( ir, or, &tile, tile.left, yo ) )
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return( -1 );
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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_transpose3d_build( VipsObject *object )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
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VipsConversion *conversion = VIPS_CONVERSION( object );
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VipsTranspose3d *transpose3d = (VipsTranspose3d *) object;
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VipsImage *in;
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if( VIPS_OBJECT_CLASS( vips_transpose3d_parent_class )->
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build( object ) )
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return( -1 );
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in = transpose3d->in;
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if( vips_check_coding_known( class->nickname, in ) ||
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vips_image_pio_input( in ) )
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return( -1 );
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if( !vips_object_argument_isset( object, "page_height" ) ) {
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if( vips_image_get_int( in,
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VIPS_META_PAGE_HEIGHT, &transpose3d->page_height ) )
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return( -1 );
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}
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if( transpose3d->page_height <= 0 ||
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in->Ysize % transpose3d->page_height != 0 ) {
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vips_error( class->nickname, "%s", _( "bad page_height" ) );
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return( -1 );
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}
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if( vips_image_pipelinev( conversion->out,
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VIPS_DEMAND_STYLE_SMALLTILE, in, NULL ) )
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return( -1 );
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vips_image_set_int( conversion->out,
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VIPS_META_PAGE_HEIGHT, in->Ysize / transpose3d->page_height );
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if( vips_image_generate( conversion->out,
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vips_start_one, vips_transpose3d_gen, vips_stop_one,
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in, transpose3d ) )
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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_transpose3d_class_init( VipsTranspose3dClass *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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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 = "transpose3d";
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vobject_class->description = _( "transpose3d an image" );
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vobject_class->build = vips_transpose3d_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( VipsTranspose3d, in ) );
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VIPS_ARG_INT( class, "page_height", 3,
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_( "Page height" ),
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_( "Height of each input page" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsTranspose3d, page_height ),
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0, 10000000, 0 );
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}
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static void
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vips_transpose3d_init( VipsTranspose3d *transpose3d )
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{
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}
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/**
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* vips_transpose3d: (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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* Optional arguments:
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*
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* * @page_height: %gint, size of each input page
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*
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* Transpose a volumetric image.
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*
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* Volumetric images are very tall, thin images, with the metadata item
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* #VIPS_META_PAGE_HEIGHT set to the height of each sub-image.
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*
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* This operation swaps the two major dimensions, so that page N in the
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* output contains the Nth scanline, in order, from each input page.
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*
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* You can override the #VIPS_META_PAGE_HEIGHT metadata item with the optional
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* @page_height parameter.
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*
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* #VIPS_META_PAGE_HEIGHT in the output image is the number of pages in the
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* input image.
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*
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* See also: vips_grid().
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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_transpose3d( 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( "transpose3d", ap, in, out );
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va_end( ap );
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return( result );
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}
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