start vips_grid()
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John Cupitt
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278
libvips/conversion/grid.c
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278
libvips/conversion/grid.c
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/* im_grid
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*
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* 4/8/05
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* 7/9/05
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* - oops, clipping was wrong
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* 30/1/10
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* - gtkdoc
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* - small cleanups
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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 <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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#include "conversion.h"
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typedef struct _VipsGrid {
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VipsConversion parent_instance;
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VipsImage *in;
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int tile_height;
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int across;
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int down;
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} VipsGrid;
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typedef VipsConversionClass VipsGridClass;
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G_DEFINE_TYPE( VipsGrid, vips_grid, VIPS_TYPE_CONVERSION );
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static int
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vips_grid_gen( VipsRegion *or, void *vseq, void *a, void *b,
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gboolean *stop )
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{
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REGION *ir = (REGION *) seq;
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Grid *grid = (Grid *) b;
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Rect *r = &or->valid;
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int twidth = grid->in->Xsize;
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int theight = grid->tile_height;
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int x, y;
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Rect tile;
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/* Find top left of tiles we need.
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*/
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int xs = (r->left / twidth) * twidth;
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int ys = (r->top / theight) * theight;
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/* The tile enclosing the top-left corner of the requested area.
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*/
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tile.left = xs;
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tile.top = ys;
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tile.width = twidth;
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tile.height = theight;
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/* If the request fits inside a single tile, we can just pointer-copy.
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*/
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if( im_rect_includesrect( &tile, r ) ) {
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Rect irect;
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/* Translate request to input space.
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*/
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irect = *r;
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irect.left -= xs;
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irect.top -= ys;
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irect.top += grid->across * ys + theight * (xs / twidth);
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if( im_prepare( ir, &irect ) ||
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im_region_region( or, ir, r, irect.left, irect.top ) )
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return( -1 );
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return( 0 );
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}
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for( y = ys; y < IM_RECT_BOTTOM( r ); y += theight )
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for( x = xs; x < IM_RECT_RIGHT( r ); x += twidth ) {
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Rect paint;
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Rect input;
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/* Whole tile at x, y
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*/
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tile.left = x;
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tile.top = y;
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tile.width = twidth;
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tile.height = theight;
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/* Which parts touch the area of the output we are
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* building.
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*/
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im_rect_intersectrect( &tile, r, &paint );
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g_assert( !im_rect_isempty( &paint ) );
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/* Translate back to ir coordinates.
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*/
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input = paint;
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input.left -= x;
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input.top -= y;
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input.top += grid->across * y + theight * (x / twidth);
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/* Render into or.
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*/
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if( im_prepare_to( ir, or, &input,
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paint.left, paint.top ) )
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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_grid_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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VipsGrid *grid = (VipsGrid *) object;
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int n_tiles;
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if( VIPS_OBJECT_CLASS( vips_grid_parent_class )->build( object ) )
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return( -1 );
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if( vips_check_coding_known( class->nickname, grid->in ) ||
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vips_image_pio_input( grid->in ) )
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return( -1 );
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!vips_object_argument_isset( object, "background" ) ) {
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if( grid->in->Ysize % grid->tile_height != 0 ) {
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vips_error( class->nickname, "%s", _( "geometry" ) );
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return( -1 );
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}
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n_tiles = grid->in->Ysize / grid->tile_height;
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if( grid->across <= 0 ||
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grid->down <= 0 ) {
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vips_error( class->nickname, "%s", _( "bad parameters" ) );
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return( -1 );
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}
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if( grid->in->Ysize % grid->tile_height != 0 ||
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grid->in->Ysize / grid->tile_height != grid->across * grid->down ) {
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vips_error( class->nickname, "%s", _( "bad grid geometry" ) );
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return( -1 );
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}
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if( vips_image_copy_fields( conversion->out, grid->in ) )
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return( -1 );
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/* We can render small tiles with pointer copies.
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*/
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vips_demand_hint( conversion->out,
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VIPS_DEMAND_STYLE_SMALLTILE, grid->in, NULL );
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out->Xsize = grid->in->Xsize * grid->across;
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out->Ysize = grid->tile_height * grid->down;
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if( vips_image_generate( conversion->out,
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vips_start_one, vips_grid_gen, vips_stop_one,
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grid->in, grid ) )
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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_grid_class_init( VipsGridClass *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_grid_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 = "grid";
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vobject_class->description = _( "grid an image" );
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vobject_class->build = vips_grid_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( VipsGrid, in ) );
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VIPS_ARG_INT( class, "tile_height", 3,
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_( "Tile height" ),
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_( "chop into tiles this high" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsGrid, tile_height ),
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1, 10000000, 128 );
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VIPS_ARG_INT( class, "across", 3,
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_( "Across" ),
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_( "number of tiles across" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsGrid, across ),
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1, 10000000, 1 );
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}
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static void
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vips_grid_init( VipsGrid *grid )
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{
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grid->tile_height = 128;
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grid->across = 1;
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grid->down = 1;
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}
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/**
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* vips_grid:
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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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* Optional args:
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*
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* @tile_height: chop into tiles this high
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* @across: tiles across
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* @down: tiles down
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*
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* Chop a tall thin image up into a set of tiles, lay the tiles out in a grid.
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*
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* The input image should be a very tall, thin image containing a list of
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* smaller images. Volumetric or time-sequence images are often laid out like
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* this. This image is chopped into a series of tiles, each @tile_height
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* pixels high and the width of @in. The tiles are then rearranged into a grid
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* @across tiles across and @down tiles down in row-major order.
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*
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* See also: im_embed(), im_insert(), im_lrjoin().
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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_grid( 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, format );
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result = vips_call( "grid", in, out, ap );
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va_end( ap );
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return( result );
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}
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