/* Copy an image.
 *
 * Copyright: 1990, N. Dessipris, based on im_powtra()
 * Author: Nicos Dessipris
 * Written on: 02/05/1990
 * Modified on:
 * 23/4/93 J.Cupitt
 *	- adapted to work with partial images
 * 30/6/93 JC
 *	- adapted for partial v2
 *	- and ANSI C
 * 7/7/93 JC
 *	- now does IM_CODING_LABQ too
 * 22/2/95 JC
 *	- new use of im_region_region()
 * 25/6/02 JC
 *	- added im_copy_set()
 *	- hint is IM_ANY
 * 5/9/02 JC
 *	- added xoff/yoff to copy_set
 * 14/4/04 JC
 *	- im_copy() now zeros Xoffset/Yoffset (since origin is the same as
 *	  input)
 * 26/5/04 JC
 *	- added im_copy_swap()
 * 1/6/05
 *	- added im_copy_morph()
 * 13/6/05
 *	- oop, im_copy_set() was messed up
 * 29/9/06
 * 	- added im_copy_set_meta(), handy wrapper for nip2 to set meta fields
 * 2/11/06
 * 	- moved im__convert_saveable() here so it's always defined (was part
 * 	  of JPEG write code)
 * 15/2/08
 * 	- added im__saveable_t ... so we can have CMYK JPEG write
 * 24/3/09
 * 	- added IM_CODING_RAD support
 * 28/1/10
 * 	- gtk-doc
 * 	- cleanups
 * 	- removed im_copy_from() and associated stuff
 * 	- added im_copy_native()
 * 28/11/10
 * 	- im_copy_set() now sets xoff / yoff again hmmm
 * 29/9/11
 * 	- rewrite as a class
 * 1/12/11
 * 	- use glib byteswap macros
 * 15/5/15
 * 	- support bands -> width conversion
 * 4/6/15
 * 	- support width -> bands conversion
 * 5/6/15
 * 	- move byteswap out to vips_byteswap()
 * 	- move band folding out to vips_bandfold()/vips_unfold()
 */

/*

	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 copy 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 <math.h>

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

#include "pconversion.h"

typedef struct _VipsCopy {
	VipsConversion parent_instance;

	/* The input image.
	 */
	VipsImage *in;

	/* Fields we can optionally set on the way through.
	 */
	gboolean swap;
	VipsInterpretation interpretation;
	double xres;
	double yres;
	int xoffset;
	int yoffset;
	int bands;
	VipsBandFormat format;
	VipsCoding coding;
	int width;
	int height;

} VipsCopy;

typedef VipsConversionClass VipsCopyClass;

G_DEFINE_TYPE(VipsCopy, vips_copy, VIPS_TYPE_CONVERSION);

static int
vips_copy_gen(VipsRegion *out_region,
	void *seq, void *a, void *b, gboolean *stop)
{
	VipsRegion *ir = (VipsRegion *) seq;
	VipsRect *r = &out_region->valid;

	if (vips_region_prepare(ir, r) ||
		vips_region_region(out_region, ir, r, r->left, r->top))
		return -1;

	return 0;
}

/* The props we copy, if set, from the operation to the image.
 */
static const char *vips_copy_names[] = {
	"interpretation",
	"xres",
	"yres",
	"xoffset",
	"yoffset",
	"bands",
	"format",
	"coding",
	"width",
	"height"
};

static int
vips_copy_build(VipsObject *object)
{
	VipsObjectClass *class = VIPS_OBJECT_GET_CLASS(object);
	VipsConversion *conversion = VIPS_CONVERSION(object);
	VipsCopy *copy = (VipsCopy *) object;

	guint64 pel_size_before;
	guint64 pel_size_after;
	VipsImage copy_of_fields;
	int i;

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

	if (vips_image_pio_input(copy->in))
		return -1;

	if (copy->swap)
		g_warning("%s",
			_("copy swap is deprecated, use byteswap instead"));

	if (vips_image_pipelinev(conversion->out,
			VIPS_DEMAND_STYLE_THINSTRIP, copy->in, NULL))
		return -1;

	/* Take a copy of all the basic header fields. We use this for
	 * sanity-checking the changes our caller has made.
	 */
	copy_of_fields = *conversion->out;

	/* Use props to adjust header fields.
	 */
	for (i = 0; i < VIPS_NUMBER(vips_copy_names); i++) {
		const char *name = vips_copy_names[i];

		GParamSpec *pspec;
		VipsArgumentClass *argument_class;
		VipsArgumentInstance *argument_instance;

		if (vips_object_get_argument(object, name,
				&pspec, &argument_class, &argument_instance))
			return -1;

		if (argument_instance->assigned) {
			GType type = G_PARAM_SPEC_VALUE_TYPE(pspec);
			GValue value = G_VALUE_INIT;

			g_value_init(&value, type);
			g_object_get_property(G_OBJECT(object),
				name, &value);

#ifdef VIPS_DEBUG
			{
				char *str;

				str = g_strdup_value_contents(&value);
				printf("vips_copy_build: %s = %s\n", name, str);
				g_free(str);
			}
#endif /* VIPS_DEBUG */

			g_object_set_property(G_OBJECT(conversion->out),
				name, &value);
			g_value_unset(&value);
		}
	}

	/* Disallow changes which alter sizeof(pel).
	 */
	pel_size_before = VIPS_IMAGE_SIZEOF_PEL(&copy_of_fields);
	pel_size_after = VIPS_IMAGE_SIZEOF_PEL(conversion->out);
	if (pel_size_after != pel_size_before) {
		vips_error(class->nickname,
			"%s", _("must not change pel size"));
		return -1;
	}

	if (vips_image_generate(conversion->out,
			vips_start_one, vips_copy_gen, vips_stop_one,
			copy->in, copy))
		return -1;

	return 0;
}

static void
vips_copy_class_init(VipsCopyClass *class)
{
	GObjectClass *gobject_class = G_OBJECT_CLASS(class);
	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS(class);
	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS(class);

	VIPS_DEBUG_MSG("vips_copy_class_init\n");

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

	vobject_class->nickname = "copy";
	vobject_class->description = _("copy an image");
	vobject_class->build = vips_copy_build;

	/* We use copy to make fresh vipsimages to stop sharing, so don't
	 * cache it. Plus copy is cheap.
	 */
	operation_class->flags =
		VIPS_OPERATION_SEQUENTIAL |
		VIPS_OPERATION_NOCACHE;

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

	VIPS_ARG_BOOL(class, "swap", 2,
		_("Swap"),
		_("Swap bytes in image between little and big-endian"),
		VIPS_ARGUMENT_OPTIONAL_INPUT | VIPS_ARGUMENT_DEPRECATED,
		G_STRUCT_OFFSET(VipsCopy, swap),
		FALSE);

	VIPS_ARG_INT(class, "width", 3,
		_("Width"),
		_("Image width in pixels"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCopy, width),
		0, VIPS_MAX_COORD, 0);

	VIPS_ARG_INT(class, "height", 4,
		_("Height"),
		_("Image height in pixels"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCopy, height),
		0, VIPS_MAX_COORD, 0);

	VIPS_ARG_INT(class, "bands", 5,
		_("Bands"),
		_("Number of bands in image"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCopy, bands),
		0, VIPS_MAX_COORD, 0);

	VIPS_ARG_ENUM(class, "format", 6,
		_("Format"),
		_("Pixel format in image"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCopy, format),
		VIPS_TYPE_BAND_FORMAT, VIPS_FORMAT_UCHAR);

	VIPS_ARG_ENUM(class, "coding", 7,
		_("Coding"),
		_("Pixel coding"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCopy, coding),
		VIPS_TYPE_CODING, VIPS_CODING_NONE);

	VIPS_ARG_ENUM(class, "interpretation", 8,
		_("Interpretation"),
		_("Pixel interpretation"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCopy, interpretation),
		VIPS_TYPE_INTERPRETATION, VIPS_INTERPRETATION_MULTIBAND);

	VIPS_ARG_DOUBLE(class, "xres", 9,
		_("Xres"),
		_("Horizontal resolution in pixels/mm"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCopy, xres),
		-0.0, 1000000, 0);

	VIPS_ARG_DOUBLE(class, "yres", 10,
		_("Yres"),
		_("Vertical resolution in pixels/mm"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCopy, yres),
		-0.0, 1000000, 0);

	VIPS_ARG_INT(class, "xoffset", 11,
		_("Xoffset"),
		_("Horizontal offset of origin"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCopy, xoffset),
		-VIPS_MAX_COORD, VIPS_MAX_COORD, 0);

	VIPS_ARG_INT(class, "yoffset", 12,
		_("Yoffset"),
		_("Vertical offset of origin"),
		VIPS_ARGUMENT_OPTIONAL_INPUT,
		G_STRUCT_OFFSET(VipsCopy, yoffset),
		-VIPS_MAX_COORD, VIPS_MAX_COORD, 0);
}

static void
vips_copy_init(VipsCopy *copy)
{
	/* Init our instance fields.
	 */
}

/**
 * vips_copy: (method)
 * @in: input image
 * @out: (out): output image
 * @...: %NULL-terminated list of optional named arguments
 *
 * Optional arguments:
 *
 * * @width: %gint, set image width
 * * @height: %gint, set image height
 * * @bands: %gint, set image bands
 * * @format: #VipsBandFormat, set image format
 * * @coding: #VipsCoding, set image coding
 * * @interpretation: #VipsInterpretation, set image interpretation
 * * @xres: %gdouble, set image xres
 * * @yres: %gdouble, set image yres
 * * @xoffset: %gint, set image xoffset
 * * @yoffset: %gint, set image yoffset
 *
 * Copy an image, optionally modifying the header. VIPS copies images by
 * copying pointers, so this operation is instant, even for very large images.
 *
 * You can optionally change any or all header fields during the copy. You can
 * make any change which does not change the size of a pel, so for example
 * you can turn a 4-band uchar image into a 2-band ushort image, but you
 * cannot change a 100 x 100 RGB image into a 300 x 100 mono image.
 *
 * See also: vips_byteswap(), vips_bandfold(), vips_bandunfold().
 *
 * Returns: 0 on success, -1 on error.
 */
int
vips_copy(VipsImage *in, VipsImage **out, ...)
{
	va_list ap;
	int result;

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

	return result;
}

/**
 * vips_copy_file: (method)
 * @in: input image
 * @out: (out): output image
 * @...: %NULL-terminated list of optional named arguments
 *
 * A simple convenience function to copy an image to a file, then copy
 * again to output. If the image is already a file, just copy straight
 * through.
 *
 * The file is allocated with vips_image_new_temp_file().
 * The file is automatically deleted when @out is closed.
 *
 * See also: vips_copy(), vips_image_new_temp_file().
 *
 * Returns: 0 on success, -1 on error
 */

int
vips_copy_file(VipsImage *in, VipsImage **out, ...)
{
	VipsImage *file;

	if (vips_image_isfile(in))
		return vips_copy(in, out, NULL);

	if (!(file = vips_image_new_temp_file("%s.v")))
		return -1;
	if (vips_image_write(in, file) ||
		vips_image_pio_input(file)) {
		g_object_unref(file);
		return -1;
	}
	*out = file;

	return 0;
}
