183 lines
4.6 KiB
C
183 lines
4.6 KiB
C
/* vips_sink_screen() as an operation.
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*
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* 13/1/12
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* - from tilecache.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 cache 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 <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 _VipsCache {
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VipsConversion parent_instance;
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VipsImage *in;
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int tile_width;
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int tile_height;
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int max_tiles;
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} VipsCache;
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typedef VipsConversionClass VipsCacheClass;
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G_DEFINE_TYPE( VipsCache, vips_cache, VIPS_TYPE_CONVERSION );
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static int
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vips_cache_build( VipsObject *object )
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{
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VipsConversion *conversion = VIPS_CONVERSION( object );
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VipsCache *cache = (VipsCache *) object;
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VIPS_DEBUG_MSG( "vips_cache_build\n" );
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if( VIPS_OBJECT_CLASS( vips_cache_parent_class )->build( object ) )
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return( -1 );
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if( vips_sink_screen( cache->in, conversion->out, NULL,
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cache->tile_width, cache->tile_height, cache->max_tiles,
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0, NULL, NULL ) )
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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_cache_class_init( VipsCacheClass *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_cache_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 = "cache";
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vobject_class->description = _( "cache an image" );
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vobject_class->build = vips_cache_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( VipsCache, in ) );
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VIPS_ARG_INT( class, "tile_width", 3,
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_( "Tile width" ),
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_( "Tile width in pixels" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsCache, tile_width ),
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1, 1000000, 128 );
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VIPS_ARG_INT( class, "tile_height", 3,
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_( "Tile height" ),
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_( "Tile height in pixels" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsCache, tile_height ),
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1, 1000000, 128 );
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VIPS_ARG_INT( class, "max_tiles", 3,
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_( "Max tiles" ),
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_( "Maximum number of tiles to cache" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsCache, max_tiles ),
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-1, 1000000, 1000 );
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}
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static void
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vips_cache_init( VipsCache *cache )
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{
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/* By default, enough pixels for two 1920 x 1080 displays.
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*/
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cache->tile_width = 128;
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cache->tile_height = 128;
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cache->max_tiles = 250;
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}
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/**
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* vips_cache: (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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* * @tile_width: width of tiles in cache
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* * @tile_height: height of tiles in cache
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* * @max_tiles: maximum number of tiles to cache
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*
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* This operation behaves rather like vips_copy() between images
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* @in and @out, except that it keeps a cache of computed pixels.
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* This cache is made of up to @max_tiles tiles (a value of -1
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* means any number of tiles), and each tile is of size @tile_width
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* by @tile_height pixels. By default it will cache 250 128 x 128 pixel tiles,
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* enough for two 1920 x 1080 images.
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*
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* This operation is a thin wrapper over vips_sink_screen(), see the
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* documentation for that operation for details.
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*
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* It uses a set of background threads to calculate pixels and the various
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* active cache operations coordinate so as not to overwhelm your system. When
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* a request is made for an area of pixels, the operation will block until all
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* of those pixels have been calculated. Pixels are calculated with a set of
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* threads.
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*
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* See also: vips_tilecache().
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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_cache( 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( "cache", ap, in, out );
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va_end( ap );
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return( result );
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}
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