John Cupitt
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d2b4478318
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e44921f481
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/* compose a set of images together with porter-duff operators
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*
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* 25/9/17
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* - from bandjoin.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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/*
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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 <string.h>
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#include <stdlib.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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/**
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* VipsBlendMode:
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* VIPS_BLEND_MODE_OVER:
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*
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* The various Porter-Duff blend modes. See vips_composite(), for example.
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*/
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/* References:
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*
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* @gasi's composite example https://gist.github.com/jcupitt/abacc012e2991f332e8b
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*
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* https://en.wikipedia.org/wiki/Alpha_compositing
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*/
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typedef struct _VipsComposite {
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VipsConversion parent_instance;
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/* The input images.
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*/
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VipsArrayImage *in;
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/* For N input images, N - 1 blend modes.
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*/
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VipsArrayInt *mode;
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/* Compositing space. This defaults to RGB, or B_W if we only have
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* G and GA inputs.
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*/
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VipsInterpretation compositing_space;
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/* The number of inputs. This can be less than the number of images in
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* @in.
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*/
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int n;
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} VipsComposite;
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typedef VipsConversionClass VipsCompositeClass;
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G_DEFINE_TYPE( VipsComposite, vips_composite, VIPS_TYPE_CONVERSION );
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#define COMPOSE_INT( TYPE ) { \
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TYPE
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}
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static void
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vips_composite_process_line( VipsComposite *composite, VipsBandFormat format,
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VipsPel *q, VipsPel **p, int width )
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{
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int n = composite->n;
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int i;
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switch( format ) {
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case VIPS_FORMAT_UCHAR:
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COMPOSE_INT( unsigned char );
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break;
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case VIPS_FORMAT_CHAR:
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COMPOSE_INT( unsigned char );
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break;
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case VIPS_FORMAT_USHORT:
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case VIPS_FORMAT_SHORT:
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case VIPS_FORMAT_UINT:
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case VIPS_FORMAT_INT:
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case VIPS_FORMAT_FLOAT:
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case VIPS_FORMAT_DOUBLE:
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g_assert_not_reached();
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break;
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case VIPS_FORMAT_COMPLEX:
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case VIPS_FORMAT_DPCOMPLEX:
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default:
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return;
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}
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}
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static int
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vips_composite_gen( VipsRegion *or, void *seq, void *a, void *b, gboolean *stop )
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{
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VipsRegion **ir = (VipsRegion **) seq;
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VipsComposite *composite = (VipsComposite *) b;
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VipsRect *r = &or->valid;
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VipsPel *p[MAX_INPUT_IMAGES], *q;
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int y, i;
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if( vips_reorder_prepare_many( or->im, ir, r ) )
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return( -1 );
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for( i = 0; i < bandary->n; i++ )
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p[i] = VIPS_REGION_ADDR( ir[i], r->left, r->top );
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p[i] = NULL;
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q = VIPS_REGION_ADDR( or, r->left, r->top );
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VIPS_GATE_START( "vips_composite_gen: work" );
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for( y = 0; y < r->height; y++ ) {
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vips_composite_process_line( composite, ir[0]->im->BandFmt,
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q, p, r->width );
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for( i = 0; i < bandary->n; i++ )
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p[i] += VIPS_REGION_LSKIP( ir[i] );
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q += VIPS_REGION_LSKIP( or );
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}
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VIPS_GATE_STOP( "vips_composite_gen: work" );
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return( 0 );
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}
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static int
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vips_composite_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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VipsBandary *bandary = (VipsBandary *) object;
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VipsComposite *composite = (VipsComposite *) object;
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int i;
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VipsImage **in;
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VipsImage **decode;
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VipsImage **compositing;
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VipsImage **format;
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VipsImage **size;
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VipsImage **ready;
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VipsInterpretation compositing_space;
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int max_bands;
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VipsInterpretation max_interpretation;
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if( VIPS_OBJECT_CLASS( vips_composite_parent_class )->build( object ) )
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return( -1 );
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composite->n = composite->in->area->n;
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in = (VipsImage **) composite->in->data;
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decode = (VipsImage **) vips_object_local_array( object, composite->n );
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for( i = 0; i < composite->n; i++ )
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if( vips_image_decode( in[i], &decode[i] ) )
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return( -1 );
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in = decode;
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/* Are any of the images missing alpha? The first missing alpha is
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* given a solid 255 and becomes the background image, shortening n.
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*/
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for( i = 0; i < composite->n; i++ )
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if( !vips_image_hasalpha( in[i] ) ) {
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VipsImage *x;
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if( vips_bandjoin( in[i], &x, 255 ) )
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return( -1 );
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g_object_unref( in[i] );
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in[i] = x;
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composite->n = i + 1;
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break;
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}
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/* Transform to compositing space. It defaults to sRGB or B_W.
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*/
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if( !vips_object_argument_isset( object, "compositing_space" ) ) {
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gboolean all_grey;
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all_grey = TRUE;
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for( i = 0; i < composite->n; i++ )
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if( in[i]->Bands > 2 ) {
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all_grey = FALSE;
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break;
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}
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composite->compositing_space = all_grey ?
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VIPS_INTERPRETATION_B_W : VIPS_INTERPRETATION_sRGB;
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}
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compositing = (VipsImage **)
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vips_object_local_array( object, composite->n );
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for( i = 0; i < composite->n; i++ )
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if( vips_colourspace( in[i], &compositing[i],
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composite->compositing_space, NULL ) )
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return( -1 );
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in = compositing;
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/* Transform the input images to match in size and format.
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*/
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format = (VipsImage **) vips_object_local_array( object, composite->n );
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size = (VipsImage **) vips_object_local_array( object, composite->n );
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if( vips__formatalike_vec( decode, format, composite->n ) ||
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vips__sizealike_vec( format, size, composite->n ) )
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return( -1 );
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in = size;
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/* Check that they all now match in bands. This can fail for some
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* inputs.
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*/
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for( i = 1; i < composite->n; i++ )
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if( in[i]->Bands != in[0]->Bands ) {
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vips_error( class->nickname,
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_( "image %d does not have %d bands" ),
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i, in[0]->Bands );
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return( -1 );
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}
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if( vips_image_pipeline_array( conversion->out,
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VIPS_DEMAND_STYLE_THINSTRIP, in ) )
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return( -1 );
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if( vips_image_generate( conversion->out,
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vips_start_many, vips_composite_gen, vips_stop_many,
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in, composite ) )
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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_composite_class_init( VipsCompositeClass *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_composite_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 = "composite";
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vobject_class->description = _( "blend an array of images according to an array of blend modes" );
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vobject_class->build = vips_composite_build;
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operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
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VIPS_ARG_BOXED( class, "in", 0,
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_( "Inputs" ),
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_( "Array of input images" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsComposite, in ),
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VIPS_TYPE_ARRAY_IMAGE );
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VIPS_ARG_BOXED( class, "mode", 1,
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_( "Blend modes" ),
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_( "Array of VipsBlendMode to join with" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsComposite, mode ),
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VIPS_TYPE_ARRAY_INT );
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VIPS_ARG_ENUM( class, "compositing_space", 10,
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_( "Interpretation" ),
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_( "Pixel interpretation" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsComposite, compositing_space ),
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VIPS_TYPE_INTERPRETATION, VIPS_INTERPRETATION_sRGB );
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}
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static void
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vips_composite_init( VipsComposite *composite )
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{
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composite->compositing_space = VIPS_INTERPRETATION_sRGB;
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}
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static int
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vips_compositev( VipsImage **in, VipsImage **out, int n, va_list ap )
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{
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VipsArrayImage *array;
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int result;
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array = vips_array_image_new( in, n );
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result = vips_call_split( "composite", ap, array, out );
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vips_area_unref( VIPS_AREA( array ) );
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return( result );
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}
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/**
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* vips_composite:
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* @in: (array length=n) (transfer none): array of input images
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* @out: output image
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* @n: number of input images
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* @...: %NULL-terminated list of optional named arguments
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*
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* Join a set of images together, bandwise.
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*
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* If the images
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* have n and m bands, then the output image will have n + m
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* bands, with the first n coming from the first image and the last m
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* from the second.
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*
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* If the images differ in size, the smaller images are enlarged to match the
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* larger by adding zero pixels along the bottom and right.
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*
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* The input images are cast up to the smallest common type (see table
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* Smallest common format in
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* <link linkend="libvips-arithmetic">arithmetic</link>).
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*
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* See also: vips_insert().
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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_composite( VipsImage **in, VipsImage **out, int n, ... )
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{
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va_list ap;
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int result;
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va_start( ap, n );
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result = vips_compositev( in, out, n, 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_composite2:
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* @in1: first input image
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* @in2: second 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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* Join a pair of images together, bandwise. See vips_composite().
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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_composite2( VipsImage *in1, VipsImage *in2, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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VipsImage *in[2];
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in[0] = in1;
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in[1] = in2;
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va_start( ap, out );
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result = vips_compositev( in, out, 2, ap );
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va_end( ap );
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return( result );
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}
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