/* vips_sink_screen() as an operation.
 *
 * 13/1/12
 * 	- from tilecache.c
 */

/*

	This file is part of VIPS.

	VIPS is free software; you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Lesser General Public License for more details.

	You should have received a cache of the GNU Lesser General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	02110-1301  USA

 */

/*

	These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk

 */

/*
#define VIPS_DEBUG
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <vips/vips.h>
#include <vips/internal.h>
#include <vips/debug.h>

#include "pconversion.h"

typedef struct _VipsCache {
	VipsConversion parent_instance;

	VipsImage *in;
	int tile_width;
	int tile_height;
	int max_tiles;
} VipsCache;

typedef VipsConversionClass VipsCacheClass;

G_DEFINE_TYPE(VipsCache, vips_cache, VIPS_TYPE_CONVERSION);

static int
vips_cache_build(VipsObject *object)
{
	VipsConversion *conversion = VIPS_CONVERSION(object);
	VipsCache *cache = (VipsCache *) object;

	VIPS_DEBUG_MSG("vips_cache_build\n");

	if (VIPS_OBJECT_CLASS(vips_cache_parent_class)->build(object))
		return -1;

	if (vips_sink_screen(cache->in, conversion->out, NULL,
			cache->tile_width, cache->tile_height, cache->max_tiles,
			0, NULL, NULL))
		return -1;

	return 0;
}

static void
vips_cache_class_init(VipsCacheClass *class)
{
	GObjectClass *gobject_class = G_OBJECT_CLASS(class);
	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS(class);

	VIPS_DEBUG_MSG("vips_cache_class_init\n");

	gobject_class->set_property = vips_object_set_property;
	gobject_class->get_property = vips_object_get_property;

	vobject_class->nickname = "cache";
	vobject_class->description = _("cache an image");
	vobject_class->build = vips_cache_build;

	VIPS_ARG_IMAGE(class, "in", 1,
		_("Input"),
		_("Input image"),
		VIPS_ARGUMENT_REQUIRED_INPUT,
		G_STRUCT_OFFSET(VipsCache, in));

	VIPS_ARG_INT(class, "tile_width", 3,
		_("Tile width"),
		_("Tile width in pixels"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCache, tile_width),
		1, 1000000, 128);

	VIPS_ARG_INT(class, "tile_height", 3,
		_("Tile height"),
		_("Tile height in pixels"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCache, tile_height),
		1, 1000000, 128);

	VIPS_ARG_INT(class, "max_tiles", 3,
		_("Max tiles"),
		_("Maximum number of tiles to cache"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCache, max_tiles),
		-1, 1000000, 1000);
}

static void
vips_cache_init(VipsCache *cache)
{
	/* By default, enough pixels for two 1920 x 1080 displays.
	 */
	cache->tile_width = 128;
	cache->tile_height = 128;
	cache->max_tiles = 250;
}

/**
 * vips_cache: (method)
 * @in: input image
 * @out: (out): output image
 * @...: %NULL-terminated list of optional named arguments
 *
 * Optional arguments:
 *
 * * @tile_width: width of tiles in cache
 * * @tile_height: height of tiles in cache
 * * @max_tiles: maximum number of tiles to cache
 *
 * This operation behaves rather like vips_copy() between images
 * @in and @out, except that it keeps a cache of computed pixels.
 * This cache is made of up to @max_tiles tiles (a value of -1
 * means any number of tiles), and each tile is of size @tile_width
 * by @tile_height pixels. By default it will cache 250 128 x 128 pixel tiles,
 * enough for two 1920 x 1080 images.
 *
 * This operation is a thin wrapper over vips_sink_screen(), see the
 * documentation for that operation for details.
 *
 * It uses a set of background threads to calculate pixels and the various
 * active cache operations coordinate so as not to overwhelm your system. When
 * a request is made for an area of pixels, the operation will block until all
 * of those pixels have been calculated. Pixels are calculated with a set of
 * threads.
 *
 * See also: vips_tilecache().
 *
 * Returns: 0 on success, -1 on error.
 */
int
vips_cache(VipsImage *in, VipsImage **out, ...)
{
	va_list ap;
	int result;

	va_start(ap, out);
	result = vips_call_split("cache", ap, in, out);
	va_end(ap);

	return result;
}
