/**
* Convert passed image data, which is assumed to be SVG, to PNG.
*
* @param string $svg SVG image data
* @return string|bool PNG image data, or false on failure
*/
protected function rasterize($svg)
{
// This code should be factored out to a separate method on SvgHandler, or perhaps a separate
// class, with a separate set of configuration settings.
//
// This is a distinct use case from regular SVG rasterization:
// * We can skip many sanity and security checks (as the images come from a trusted source,
// rather than from the user).
// * We need to provide extra options to some converters to achieve acceptable quality for very
// small images, which might cause performance issues in the general case.
// * We want to directly pass image data to the converter, rather than a file path.
//
// See https://phabricator.wikimedia.org/T76473#801446 for examples of what happens with the
// default settings.
//
// For now, we special-case rsvg (used in WMF production) and do a messy workaround for other
// converters.
global $wgSVGConverter, $wgSVGConverterPath;
$svg = $this->massageSvgPathdata($svg);
// Sometimes this might be 'rsvg-secure'. Long as it's rsvg.
if (strpos($wgSVGConverter, 'rsvg') === 0) {
$command = 'rsvg-convert';
if ($wgSVGConverterPath) {
$command = wfEscapeShellArg("{$wgSVGConverterPath}/") . $command;
}
$process = proc_open($command, array(0 => array('pipe', 'r'), 1 => array('pipe', 'w')), $pipes);
if (is_resource($process)) {
fwrite($pipes[0], $svg);
fclose($pipes[0]);
$png = stream_get_contents($pipes[1]);
fclose($pipes[1]);
proc_close($process);
return $png ?: false;
}
return false;
} else {
// Write input to and read output from a temporary file
$tempFilenameSvg = tempnam(wfTempDir(), 'ResourceLoaderImage');
$tempFilenamePng = tempnam(wfTempDir(), 'ResourceLoaderImage');
file_put_contents($tempFilenameSvg, $svg);
$metadata = SVGMetadataExtractor::getMetadata($tempFilenameSvg);
if (!isset($metadata['width']) || !isset($metadata['height'])) {
unlink($tempFilenameSvg);
return false;
}
$handler = new SvgHandler();
$res = $handler->rasterize($tempFilenameSvg, $tempFilenamePng, $metadata['width'], $metadata['height']);
unlink($tempFilenameSvg);
$png = null;
if ($res === true) {
$png = file_get_contents($tempFilenamePng);
unlink($tempFilenamePng);
}
return $png ?: false;
}
}
/**
* Generate a graph for this tag
* @param string $tag
* @param string $filePath
* @return bool, success
*/
public function makeSvgGraph( $tag, $filePath ) {
global $wgSvgGraphDir, $wgContLang, $wgMemc;
require_once( "$wgSvgGraphDir/svgGraph.php" ); // load classes
require_once( "$wgSvgGraphDir/svgGraph2.php" ); // load classes
// Define the object
$plot = new svgGraph2();
// Set file path
$dir = dirname($filePath);
// Make sure directory exists
if( !file_exists($dir) && !wfMkdirParents( $dir, 0777, __METHOD__ ) ) {
throw new MWException( 'Could not create file directory!' );
}
// Set some parameters
$plot->graphicWidth = 1000;
$plot->graphicHeight = 410;
$plot->plotWidth = 930;
$plot->plotHeight = 350;
$plot->decimalPlacesY = 1;
$plot->plotOffsetX = 40;
$plot->plotOffsetY = 30;
$plot->numGridlinesY = 10 + 1;
$plot->innerPaddingX = 15;
$plot->innerPaddingY = 10;
$plot->outerPadding = 5;
$plot->minY = 0;
$plot->maxY = 5;
// Define the data using the DB rows
$dataX = $dave = $rave = $dcount = array();
$totalVal = $totalCount = $sd = $pts = $n = 0;
// Define the data using the DB rows
list($res,$u,$maxC,$days) = $this->doQuery( $tag );
if( !$maxC ) return false;
// Label spacing
$int = intval( ceil($days/10) ); // 10 labels at most
foreach ( $res as $row ) {
$totalVal += (int)$row->rfh_total;
$totalCount += (int)$row->rfh_count;
$dayCount = (real)$row->rfh_count;
if( !$row->rfh_count ) continue; // bad data
// Nudge values up by 1 to fit [1,5]
$dayAve = 1 + (real)$row->rfh_total/(real)$row->rfh_count;
$sd += pow($dayAve - $u,2);
$cumAve = 1 + (real)$totalVal/(real)$totalCount;
$year = intval( substr( $row->rfh_date, 0, 4 ) );
$month = intval( substr( $row->rfh_date, 4, 2 ) );
$day = intval( substr( $row->rfh_date, 6, 2 ) );
# Fill in days with no votes to keep spacing even
if( isset($lastDate) ) {
$dayGap = wfTimestamp(TS_UNIX,$row->rfh_date) - wfTimestamp(TS_UNIX,$lastDate);
$x = intval( $dayGap/86400 );
# Day gaps...
for( $x; $x > 1; --$x ) {
$dataX[] = "";
$dave[] = $lastDAve;
$rave[] = $lastRAve;
$dcount[] = 0;
$n++;
}
}
$n++;
# Label point?
if( $n >= $int || !count($dataX) ) {
$p = ($days > 31) ? "{$month}-".substr( $year, 2, 2 ) : "{$month}/{$day}";
$n = 0;
} else {
$p = "";
}
$dataX[] = $p;
$dave[] = $dayAve;
$rave[] = $cumAve;
$dcount[] = $dayCount;
$lastDate = $row->rfh_date;
$lastDAve = $dayAve;
$lastRAve = $cumAve;
$pts++;
}
// Minimum sample size
if( $pts < 2 ) {
return false;
}
$sd = sqrt($sd/$pts);
// Round values for display
$sd = round( $sd, 3 );
$u = round( $u, 3 );
// Re-scale voter count to fit to graph
$this->dScale = ceil($maxC/5);
// Cache the scale value to memory
$key = wfMemcKey( 'feedback', 'scale', $this->page->getArticleId(), $this->period );
$wgMemc->set( $key, $this->dScale, 7*24*3600 );
// Fit to [0,4]
foreach( $dcount as $x => $c ) {
$dcount[$x] = $c/$this->dScale;
}
$plot->dataX = $dataX;
$plot->dataY['dave'] = $dave;
$plot->dataY['rave'] = $rave;
$plot->dataY['dcount'] = $dcount;
$plot->styleTagsX = 'font-family: monospace; font-size: 9pt;';
$plot->styleTagsY = 'font-family: sans-serif; font-size: 11pt;';
$plot->format['dave'] = array( 'style' => 'stroke:blue; stroke-width:1;' );
$plot->format['rave'] = array( 'style' => 'stroke:green; stroke-width:1;' );
$plot->format['dcount'] = array( 'style' => 'stroke:red; stroke-width:1;' );
#'attributes' => "marker-end='url(#circle)'");
$pageText = $wgContLang->truncate( $this->page->getPrefixedText(), 65 );
$plot->title = wfMsgExt('ratinghistory-graph',array('parsemag','content'),
$totalCount, wfMsgForContent("readerfeedback-$tag"), $pageText );
$plot->styleTitle = 'font-family: sans-serif; font-weight: bold; font-size: 12pt;';
$plot->backgroundStyle = 'fill:#F0F0F0;';
// extra code for markers
// FIXME: http://studio.imagemagick.org/pipermail/magick-bugs/2003-January/001038.html
/* $plot->extraSVG =
'<defs>
<marker id="circle" style="stroke:red; stroke-width:0; fill:red;"
viewBox="0 0 10 10" refX="5" refY="7" orient="0"
markerUnits="strokeWidth" markerWidth="5" markerHeight="5">
<circle cx="5" cy="5" r="3"/>
</marker>
</defs>';
*/
# Create the graph
@$plot->init();
$plot->drawGraph();
if( !$plot->polyLine('dave') ) {
throw new MWException( 'Could not generate "dave" line!' );
}
if( !$plot->polyLine('rave') ) {
throw new MWException( 'Could not generate "rave" line!' );
}
if( !$plot->polyLine('dcount') ) {
throw new MWException( 'Could not generate "dcount" line!' );
}
#$plot->line('dcount');
// Render!
$plot->generateSVG( "xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink'" );
// Write to file for cache
$svgPath = $this->getFilePath( $tag, 'svg' );
$svgHandler = new SvgHandler();
wfSuppressWarnings(); // FS notices possible
if( !file_put_contents( $svgPath, $plot->svg ) ) {
wfRestoreWarnings();
throw new MWException( 'Could not write SVG file!' );
}
wfRestoreWarnings();
// Rasterize due to IE suckage
$status = $svgHandler->rasterize( $svgPath, $filePath, 1000, 410 );
if( $status !== true ) {
wfDebug( 'Could not rasterize SVG file from '.$filePath.'!' );
//return false;
}
return true;
}