<?php

/*
    hicg -- Harmattan Icon/Color Generator
    Copyright (C) 2011 Javier S. Pedro <maemo@javispedro.com>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 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 Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

define('SVGNS', 'http://www.w3.org/2000/svg');

define('COLOR_EXTRACT_RENDER_SIZE', 128);
define('HARMATTAN_ICON_SIZE', 80);
define('HARMATTAN_FOCAL_SIZE', 54);

function svg2png($svg, $w, $h, $png)
{
	$output = array();
	$exitcode = -1;
	$cmd = sprintf("~/bin/rsvg-convert --format=png --width=%d --height=%d --output=%s %s", $w, $h, escapeshellarg($png), escapeshellarg($svg));
	exec($cmd, $output, $exitcode);
	return $exitcode == 0 && file_exists($png);
}

function multiarray($d, $k, $n = 0)
{
	return array_fill(0, $k, $d == 1 ? $n : multiarray($d - 1, $k, $n));
}

function warn($s)
{
	global $warnings;
	$warnings[] = $s;
}

function colfilter_none($c)
{
	return false;
}

function colfilter_pure($c)
{
	return ($c['red'] == 0 && $c['green'] == 0 && $c['blue'] == 0) ||
		   ($c['red'] == 255 && $c['green'] == 255 && $c['blue'] == 255);
}

function colfilter_grey($c)
{
	return ($c['red'] == $c['green']) && ($c['green'] == $c['blue']);
}

function colfilter_grey5($c)
{
	$r = $c['red'] >> 3;
	$g = $c['green'] >> 3;
	$b = $c['blue'] >> 3;
	return ($r == $g) && ($g == $b);
}

function domcolor_mean($img, $flt)
{
	$w = imagesx($img);
	$h = imagesy($img);
	$t = $w * $h;
	$r = 0; $g = 0; $b = 0;
	for ($y = 0; $y < $h; $y++) {
		for ($x = 0; $x < $w; $x++) {
			$c = imagecolorsforindex($img, imagecolorat($img, $x, $y));
			if (call_user_func($flt, $c)) continue;
			$r += $c['red'];
			$g += $c['green'];
			$b += $c['blue'];
		}
	}
	$r /= $t; $g /= $t;	$b /= $t;
	return array($r, $g, $b);
}

function domcolor_mode($img, $flt)
{
	$w = imagesx($img);
	$h = imagesy($img);
	$t = $w * $h;
	$f = multiarray(3, 256, 0);
	$max_c = false;
	$max_f = 0;
	for ($y = 0; $y < $h; $y++) {
		for ($x = 0; $x < $w; $x++) {
			$c = imagecolorsforindex($img, imagecolorat($img, $x, $y));
			if (call_user_func($flt, $c)) continue;
			$this_f = $f[$c['red']][$c['green']][$c['blue']] += 1;
			if ($this_f > $max_f) {
				$max_c = $c;
				$max_f = $this_f;
			}
		}
	}
	if ($max_c)
		return array($max_c['red'], $max_c['green'], $max_c['blue']);
	else
		return false;
}


function domcolor_custom($img, $flt)
{
	$color = $_POST['customcolor'];

	/* Remove prefixing '#' if present. */
	if ($color[0] == '#')	$color = substr($color, 1);

	if (strlen($color) == 6) {
		/* Handle rrggbb format. */
		$r = $color[0].$color[1];
		$g = $color[2].$color[3];
		$b = $color[4].$color[5];
	} elseif (strlen($color) == 3) {
		/* Handle rgb format. */
		$r = $color[0].$color[0];
		$g = $color[1].$color[1];
		$b = $color[2].$color[2];
	} else {
		/* Unknown format. */
		return false;
	}

	return array(hexdec($r), hexdec($g), hexdec($b));
}

$domalgos = array('mean', 'mode', 'custom');
$colfilters = array('none', 'pure', 'grey', 'grey5');

function extract_dominant_color($svg, $algo = 'average', $filter = 'grey')
{
	global $domalgos, $colfilters;
	$png = '/tmp/hicg-icon-' . uniqid() . '.png';
	if (!in_array($algo, $domalgos)) {
		warn('Invalid dominant color extraction algorithm');
		return false;
	}
	if (!in_array($filter, $colfilters)) {
		warn('Invalid colors to ignore');
		return false;
	}
	if (!svg2png($svg, COLOR_EXTRACT_RENDER_SIZE, COLOR_EXTRACT_RENDER_SIZE, $png)) {
		warn('Initial rasterization failed (not an .svg file?)');
		return false;
	}
	$img = imagecreatefrompng($png);
	if (!$img) {
		warn('Initial rasterization generated incorrect PNG');
		return false;
	}
	$color = call_user_func('domcolor_'. $algo, $img, 'colfilter_'.$filter);
	imagedestroy($img);
	unlink($png);
	if (!$color) {
		warn("I failed to get a dominant color. Your icon might be too greyish, so I'm making it grey.");
		return array(128, 128, 128);
	}
	return $color;
}

function clip_color_value($c)
{
	if ($c < 0) return 0;
	else if ($c > 255) return 255;
	return $c;
}

function clip_color($c)
{
	return array_map('clip_color_value', $c);
}

function greyscale_color($c)
{
	return .299*$c[0] + .587*$c[1] + .114*$c[2];
}

function color2hex($c)
{
	return sprintf("%02x%02x%02x", $c[0], $c[1], $c[2]);
}

function get_disabled_color($c)
{
	/* Clear and desature a bit. */
	$nc = array_map(create_function('$x', 'return $x + 90;'), $c);
	$grey = greyscale_color($nc);
	$nc = array_map(create_function('$x', 'return $x * 0.8 + ('.$grey.') * 0.2;'), $nc);
	return clip_color($nc);
}

function get_pressed_color($c)
{
	/* Desaturate and darken. */
	$grey = greyscale_color($c);
	$nc = array_map(create_function('$x', 'return $x * 0.5 + ('.$grey.') * 0.5;'), $c);
	$nc = array_map(create_function('$x', 'return $x - 40;'), $nc);

	return clip_color($nc);
}

function get_icon_light_color($c)
{
	$nc = array_map(create_function('$x', 'return $x + 60;'), $c);
	return clip_color($nc);
}

function get_icon_dark_color($c)
{
	$nc = array_map(create_function('$x', 'return $x - 50;'), $c);
	return clip_color($nc);
}

function get_svg_attribute($node, $attrib)
{
	$v = $node->getAttributeNS(SVGNS, 'svg:' . $attrib);
	if (empty($v)) {
		$v = $node->getAttribute('svg:' . $attrib);
		if (empty($v)) {
			$v = $node->getAttribute($attrib);
		}
	}

	return $v;
}

function calc_scale_ratios($w, $h, &$s, &$tx, &$ty)
{
	if ($w > $h) {
		$s = HARMATTAN_FOCAL_SIZE / $w;
		$sw = HARMATTAN_FOCAL_SIZE;
		$sh = $s * $h;
	} else {
		$s = HARMATTAN_FOCAL_SIZE / $h;
		$sw = $s * $w;
		$sh = HARMATTAN_FOCAL_SIZE;
	}
	$tx = HARMATTAN_ICON_SIZE / 2 - $sw / 2;
	$ty = HARMATTAN_ICON_SIZE / 2 - $sh / 2;
}

function make_icon($src, $template, $dst, $color, $shadow)
{
	$srcDoc = new DOMDocument();
	$srcDoc->load($src);
	$doc = new DOMDocument();
	$doc->load($template);
	$xpath = new DOMXPath($doc);
	$xpath->registerNamespace('svg', SVGNS);

	/* Get scaling ratios from source SVG. */
	$srcNode = $srcDoc->documentElement;
	$w = intval(get_svg_attribute($srcNode, 'width'));
	$h = intval(get_svg_attribute($srcNode, 'height'));
	calc_scale_ratios($w, $h, $s, $tx, $ty);

	/* Set background color */
	$bkg = $xpath->query('/svg:svg/svg:g/svg:path[@id="hicg_background"]');
	$bkg->item(0)->setAttribute('fill', '#' . color2hex($color));

	/* Create the scaling & centering transform. */
	$g = $doc->createElement('g');
	$g->setAttribute('transform', "translate($tx, $ty) scale($s)");

	/* Add drop shadow filter if selected. */
	if ($shadow) {
		$g->setAttribute('filter', 'url(#hicg_drop_shadow)');
	}

	foreach ($srcNode->childNodes as $node) {
		$n = $doc->importNode($node, TRUE);
		$g->appendChild($n);
	}
	
	$doc->documentElement->appendChild($g);

	$doc->save($dst);

	return true;
}

function make_png($src, $dst)
{
	if (!svg2png($src, HARMATTAN_ICON_SIZE, HARMATTAN_ICON_SIZE, $dst)) {
		warn("I failed to generate a 80x80 PNG.");
		return false;
	}
	return true;
}

$warnings = array();
$loadsample = true;

if (@isset($_POST['send'])) {
	$prefix = './files/' . uniqid() . '_';
	$srcfile = $prefix . 'src.svg';
	if (!move_uploaded_file($_FILES['iconfile']['tmp_name'], $srcfile)) {
		die('Upload failed.');
	}
	$domalgo = $_POST['domalgo'];
	$colfilter = $_POST['colfilter'];
	$dropshadow = $_POST['dropshadow'] == 'dropshadow';
	$iconfile = $prefix . 'icon.svg';
	$pngfile = $prefix . 'icon.png';

	$domcolor = extract_dominant_color($srcfile, $domalgo, $colfilter);
	if ($domcolor) {
		$loadsample = false;
		$discolor = get_disabled_color($domcolor);
		$prscolor = get_pressed_color($domcolor);
	}

	if (!$loadsample) {
		make_icon($srcfile, 'template.svg', $iconfile, $domcolor, $dropshadow);
		make_png($iconfile, $pngfile);
	} else {
		/* Something went really wrong and we will show the sample, so delete uploaded SVG. */
		unlink($srcfile);
	}

	$srcurl = $srcfile;
	$iconurl = $iconfile;
	$pngurl = $pngfile;
}

if (php_sapi_name() == 'cli' && $argc >= 2) {
	$loadsample = false;
	$srcfile = $argv[1];
	$domalgo = 'mode';
	$dropshadow = true;
	$colfilter = 'grey';
	$iconfile = 'cliicon.svg';
	$pngfile = 'cliicon.png';

	$domcolor = extract_dominant_color($srcfile, $domalgo, $colfilter);

	make_icon($srcfile, 'template.svg', $iconfile, $domcolor, $dropshadow);
	make_png($iconfile, $pngfile);

	exit(0);
}

if ($loadsample) {
	/* Load some sample data. */
	$srcfile = 'samplesrc.svg';
	$domalgo = 'mode';
	$dropshadow = true;
	$colfilter = 'grey';
	$iconfile = 'sampleicon.svg';
	$pngfile = 'sampleicon.png';

	$domcolor = extract_dominant_color($srcfile, $domalgo, $colfilter);
	$discolor = get_disabled_color($domcolor);
	$prscolor = get_pressed_color($domcolor);

	$srcurl = $srcfile;
	$iconurl = $iconfile;
	$pngurl = $pngfile;
}

echo '<?xml version="1.0" encoding="utf-8" ?>';
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
	  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Harmattan Icon Generator</title>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>
<?php if (!empty($warnings)): ?>
<h1>Warnings</h1>
<?php foreach ($warnings as $w): ?>
	<p><strong>Warning:</strong> <?php echo $w; ?></p>
<?php endforeach; ?>
<?php endif; ?>
<h1>Upload your icon</h1>
<form enctype="multipart/form-data" action="." method="post">
	<fieldset>
		<legend>Your application's current icon file</legend>
		<label>SVG icon file:
			<input type="file" name="iconfile" size="60" />
		</label>
	</fieldset>
	<fieldset>
		<legend>Algorithm for dominant color extraction</legend>
		<label><input type="radio" name="domalgo" value="mean" />Mean / Average</label>
		<label><input type="radio" name="domalgo" value="mode" checked="true" />Mode</label>
		<label><input type="radio" name="domalgo" value="custom" />Custom color:</label>
		<input type="text" name="customcolor" maxlength="7" />
	</fieldset>
	<fieldset>
		<legend>Colors to ignore</legend>
		<label><input type="radio" name="colfilter" value="none" />None</label>
		<label><input type="radio" name="colfilter" value="pure" />Pure white/blacks</label>
		<label><input type="radio" name="colfilter" value="grey" checked="true" />Pure greys</label>
		<label><input type="radio" name="colfilter" value="grey5" />Greys at 5bpp per channel</label>
	</fieldset>
	<fieldset>
		<legend>Drop shadow</legend>
		<label><input type="checkbox" name="dropshadow" value="dropshadow" checked="true" />Add drop shadow</label>
	</fieldset>
	<div class="buttons">
		<input type="submit" name="send" value="Submit" />
	</div>
</form>
<h1>Results</h1>
<div id="uploaded">
	<p>You uploaded:</p>
	<object type="image/svg+xml" data="<?php echo $srcurl; ?>" width="200" height="200"></object>
</div>
<div id="results">
	<div id="yourcolor">
		<p>Your icon's dominant color is <span class="color">#<?php echo color2hex($domcolor); ?></span></p>
		<div class="color" style="background-color: #<?php echo color2hex($domcolor); ?>;"></div>
	</div>
	<div id="discolor">
		<p>A suggested disabled color is <span class="color">#<?php echo color2hex($discolor); ?></span></p>
		<div class="color" style="background-color: #<?php echo color2hex($discolor); ?>;"></div>
	</div>
	<div id="prscolor">
		<p>A suggested pressed color is <span class="color">#<?php echo color2hex($prscolor); ?></span></p>
		<div class="color" style="background-color: #<?php echo color2hex($prscolor); ?>;"></div>
	</div>
	<div id="youricon">
		<p>Harmattan style icon:</p>
		<div>
			<div class="icon">
				<object type="image/svg+xml" data="<?php echo $iconurl; ?>" width="80" height="80"></object>
				<p>YourApp</p>
			</div>
		</div>
	</div>
	<p>Download the prerendered 80x80 <a href="<?php echo $pngurl; ?>">PNG file</a>. Or a <a href="<?php echo $iconurl; ?>">SVG file</a>, if you want to make more changes.</p>
</div>
<h1>Suggested reading</h1>
<ul>
	<li><a href="http://www.developer.nokia.com/swipe/ux/pages/Colour.html">Nokia N9 UX Color Guidelines</a></li>
	<li><a href="http://www.developer.nokia.com/swipe/ux/pages/Icons.html">Nokia N9 UX Icon Guidelines</a></li>
	<li><a href="https://gitorious.org/hicg/hicg">The source for this tool</a></li>
</ul>
</body>
</html>