/* a complicated operation for testing
 *
 * 6/10/06
 *	- hacked in
 * 27/11/06
 *	- added im_benchmarkn()
 * 1/2/11
 * 	- gtk-doc
 */

/*

	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

 */

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

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

#include <vips/vips.h>
#include <vips/vips7compat.h>

/*

VIPS SMP benchmark
------------------

This is adapted from the system used to generate images for POD:

  http://cima.ng-london.org.uk/~john/POD

Images from a 10k by 10k studio digital camera are colour processed, resized,
cropped and sharpened.

The original POD script was written in nip (see below). This operation is a
reimplementation in vanilla C to make it easier to run (and less fragile!).

This thing was originally processing images off a remote server over a 100mbit
network. No attempt was made to make it quick (there was no point): you
could make it a lot faster very easily.

------ benchmark in nip2 -----------
#!/home/john/vips/bin/nip2 -s

// get command-line arguments

image_path = argv?1;
crop_id = parse_pint argv?2;
crop_left = parse_pint argv?3;
crop_top = parse_pint argv?4;
crop_width = parse_pint argv?5;
crop_height = parse_pint argv?6;
width = parse_pint argv?7;
height = parse_pint argv?8;
sharp = parse_pint argv?9;

// scale down by this much to undo photographic's relativisation
darken = Vector [1.18, 1, 1];

// fudge factor in XYZ to get a match under NGC lights on uv-durable paper
white_point_adjust = Vector [1.06, 1, 1.01];

// brighten by this in XYZ to get relative colorimetry
brighten = 1.5;

// blacks down by this much in LAB
blacks_down = Vector [-2, 0, 0];

// sharpen params for 400, 300, 200 and 150 dpi
// just change the size of the area we search
sharpen_params_table = [
	[ 11, 2.5, 40, 20, 0.5, 1.5 ],
	[ 7, 2.5, 40, 20, 0.5, 1.5 ],
	[ 5, 2.5, 40, 20, 0.5, 1.5 ],
	[ 3, 2.5, 40, 20, 0.5, 1.5 ]
];

// convert D65 XYZ to D50 XYZ
D652D50 = recomb D652D50_direct;

stage_crop in
	= extract_area crop_left crop_top crop_width crop_height in,
		 crop_id != 0
	= in;

// fit within a width / height
stage_shrink image
	= image, factor > 1;	// never upscale
	= resize factor factor Interpolate.BILINEAR image
{
		hfactor = width / get_width image;
		vfactor = height / get_height image;
		factor = min_pair hfactor vfactor;
}

// unphotoize, go to xyz, convert to D50, adjust white point, back to lab
stage_colour in
		= if in?0 > 99 then Vector [100, 0, 0] else in'''
{
	// back to absolute
		in' = in / darken;

	xyz = colour_transform_to Image_type.XYZ in';

	xyz' = D652D50 xyz * white_point_adjust * brighten;

		in'' = colour_transform_to Image_type.LAB xyz';

	// shadows down
	in''' = in'' + blacks_down;
}

stage_sharp in
	= (sharpen params?0 params?1 params?2 params?3 params?4 params?5 @
		colour_transform_to Image_type.LABQ) in
{
	params = sharpen_params_table?sharp;
}

// This was:
//
// stage_srgb in
//	= (icc_export 8 "$VIPSHOME/share/nip2/data/sRGB.icm" 1 @
//		colour_transform_to Image_type.LABQ) in;
//
// but that uses lcms which is single-threaded. So for this benchmark, we use
// VIPS's own ->sRGB converter, which is less accurate but does thread.
stage_srgb in
	= colour_transform_to Image_type.sRGB in;

main = (get_image @ stage_srgb @
	stage_sharp @ stage_colour @ stage_shrink @ stage_crop @
	colour_transform_to Image_type.LAB @ Image_file) image_path;
------ benchmark in nip2 -----------

 */

/* The main part of the benchmark ... transform labq to labq. Chain several of
 * these together to get a CPU-bound operation.
 */
static int
benchmark(IMAGE *in, IMAGE *out)
{
	IMAGE *t[18];
	double one[3] = { 1.0, 1.0, 1.0 };
	double zero[3] = { 0.0, 0.0, 0.0 };
	double darken[3] = { 1.0 / 1.18, 1.0, 1.0 };
	double whitepoint[3] = { 1.06, 1.0, 1.01 };
	double shadow[3] = { -2, 0, 0 };
	double white[3] = { 100, 0, 0 };
	DOUBLEMASK *d652d50 = im_create_dmaskv("d652d50", 3, 3,
		1.13529, -0.0604663, -0.0606321,
		0.0975399, 0.935024, -0.0256156,
		-0.0336428, 0.0414702, 0.994135);

	im_add_close_callback(out,
		(im_callback_fn) im_free_dmask, d652d50, NULL);

	return (
		/* Set of descriptors for this operation.
		 */
		im_open_local_array(out, t, 18, "im_benchmark", "p") ||

		/* Unpack to float.
		 */
		im_LabQ2Lab(in, t[0]) ||

		/* Crop 100 pixels off all edges.
		 */
		im_extract_area(t[0], t[1],
			100, 100, t[0]->Xsize - 200, t[0]->Ysize - 200) ||

		/* Shrink by 10%, bilinear interp.
		 */
		im_affinei_all(t[1], t[2],
			vips_interpolate_bilinear_static(),
			0.9, 0, 0, 0.9,
			0, 0) ||

		/* Find L ~= 100 areas (white surround).
		 */
		im_extract_band(t[2], t[3], 0) ||
		im_moreconst(t[3], t[4], 99) ||

		/* Adjust white point and shadows.
		 */
		im_lintra_vec(3, darken, t[2], zero, t[5]) ||
		im_Lab2XYZ(t[5], t[6]) ||
		im_recomb(t[6], t[7], d652d50) ||
		im_lintra_vec(3, whitepoint, t[7], zero, t[8]) ||
		im_lintra(1.5, t[8], 0.0, t[9]) ||
		im_XYZ2Lab(t[9], t[10]) ||
		im_lintra_vec(3, one, t[10], shadow, t[11]) ||

		/* Make a solid white image.
		 */
		im_black(t[12], t[4]->Xsize, t[4]->Ysize, 3) ||
		im_lintra_vec(3, zero, t[12], white, t[13]) ||

		/* Reattach border.
		 */
		im_ifthenelse(t[4], t[13], t[11], t[14]) ||

		/* Sharpen.
		 */
		im_Lab2LabQ(t[14], t[15]) ||
		im_sharpen(t[15], out, 11, 2.5, 40, 20, 0.5, 1.5));
}

/**
 * im_benchmarkn:
 * @in: input image
 * @out: output image
 * @n: iterations
 *
 * This operation runs a complicated set of other operations on image @in,
 * producing image @out. Use @n to set the number of iterations to run: a
 * larger number will make the operation more CPU-bound, a smaller number will
 * make the operation more IO-bound.
 *
 * See http://www.vips.ecs.soton.ac.uk/index.php?title=Benchmarks for a
 * detailed discussion of the benchmark and some sample results.
 *
 * See also: im_benchmark2().
 *
 * Returns: 0 on success, -1 on error
 */
int
im_benchmarkn(IMAGE *in, IMAGE *out, int n)
{
	IMAGE *t[2];

	if (n == 0)
		/* To sRGB.
		 */
		return im_LabQ2disp(in, out, im_col_displays(7));
	else
		return im_open_local_array(out, t, 2, "benchmarkn", "p") ||
			benchmark(in, t[0]) ||

			/* Expand back to the original size again ...
			 * benchmark does a 200 pixel crop plus a 10% shrink,
			 * so if we chain many of them together the image gets
			 * too small.
			 */
			im_affinei_all(t[0], t[1],
				vips_interpolate_bilinear_static(),
				(double) in->Xsize / t[0]->Xsize, 0, 0,
				(double) in->Ysize / t[0]->Ysize,
				0, 0) ||

			im_benchmarkn(t[1], out, n - 1);
}

/**
 * im_benchmark2:
 * @in: input image
 * @out: average image value
 *
 * This operation runs a single im_benchmarkn() and calculates the average
 * pixel value. It's useful if you just want to test image input.
 *
 * See also: im_benchmarkn().
 *
 * Returns: 0 on success, -1 on error
 */
int
im_benchmark2(IMAGE *in, double *out)
{
	IMAGE *t;

	return !(t = im_open_local(in, "benchmarkn", "p")) ||
		im_benchmarkn(in, t, 1) ||
		im_avg(t, out);
}
