150 lines
4.1 KiB
PHP
150 lines
4.1 KiB
PHP
<?php
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/**
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* Return a rounded pixel equivalent for a labeled CSS/SVG length.
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* http://www.w3.org/TR/SVG11/coords.html#UnitIdentifiers
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*
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* @param $length String: CSS/SVG length.
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* @return Integer: length in pixels
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*/
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function wfScaleSVGUnit( $length ) {
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static $unitLength = array(
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'px' => 1.0,
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'pt' => 1.25,
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'pc' => 15.0,
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'mm' => 3.543307,
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'cm' => 35.43307,
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'in' => 90.0,
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'' => 1.0, // "User units" pixels by default
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'%' => 2.0, // Fake it!
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);
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$matches = array();
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if( preg_match( '/^(\d+(?:\.\d+)?)(em|ex|px|pt|pc|cm|mm|in|%|)$/', $length, $matches ) ) {
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$length = floatval( $matches[1] );
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$unit = $matches[2];
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return round( $length * $unitLength[$unit] );
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} else {
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// Assume pixels
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return round( floatval( $length ) );
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}
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}
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/**
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* Compatible with PHP getimagesize()
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* @todo support gzipped SVGZ
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* @todo check XML more carefully
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* @todo sensible defaults
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*
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* @param $filename String: full name of the file (passed to php fopen()).
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* @return array
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*/
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function wfGetSVGsize( $filename ) {
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$width = 256;
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$height = 256;
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// Read a chunk of the file
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$f = fopen( $filename, "rt" );
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if( !$f ) return false;
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$chunk = fread( $f, 4096 );
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fclose( $f );
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// Uber-crappy hack! Run through a real XML parser.
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$matches = array();
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if( !preg_match( '/<svg\s*([^>]*)\s*>/s', $chunk, $matches ) ) {
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return false;
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}
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$tag = $matches[1];
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if( preg_match( '/\bwidth\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
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$width = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
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}
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if( preg_match( '/\bheight\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
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$height = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
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}
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return array( $width, $height, 'SVG',
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"width=\"$width\" height=\"$height\"" );
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}
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/**
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* Determine if an image exists on the 'bad image list'.
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*
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* The format of MediaWiki:Bad_image_list is as follows:
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* * Only list items (lines starting with "*") are considered
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* * The first link on a line must be a link to a bad image
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* * Any subsequent links on the same line are considered to be exceptions,
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* i.e. articles where the image may occur inline.
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*
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* @param string $name the image name to check
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* @param Title $contextTitle The page on which the image occurs, if known
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* @return bool
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*/
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function wfIsBadImage( $name, $contextTitle = false ) {
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static $badImages = false;
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wfProfileIn( __METHOD__ );
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# Run the extension hook
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$bad = false;
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if( !wfRunHooks( 'BadImage', array( $name, &$bad ) ) ) {
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wfProfileOut( __METHOD__ );
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return $bad;
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}
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if( !$badImages ) {
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# Build the list now
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$badImages = array();
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$lines = explode( "\n", wfMsgForContentNoTrans( 'bad_image_list' ) );
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foreach( $lines as $line ) {
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# List items only
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if ( substr( $line, 0, 1 ) !== '*' ) {
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continue;
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}
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# Find all links
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$m = array();
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if ( !preg_match_all( '/\[\[:?(.*?)\]\]/', $line, $m ) ) {
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continue;
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}
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$exceptions = array();
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$imageDBkey = false;
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foreach ( $m[1] as $i => $titleText ) {
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$title = Title::newFromText( $titleText );
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if ( !is_null( $title ) ) {
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if ( $i == 0 ) {
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$imageDBkey = $title->getDBkey();
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} else {
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$exceptions[$title->getPrefixedDBkey()] = true;
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}
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}
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}
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if ( $imageDBkey !== false ) {
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$badImages[$imageDBkey] = $exceptions;
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}
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}
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}
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$contextKey = $contextTitle ? $contextTitle->getPrefixedDBkey() : false;
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$bad = isset( $badImages[$name] ) && !isset( $badImages[$name][$contextKey] );
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wfProfileOut( __METHOD__ );
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return $bad;
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}
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/**
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* Calculate the largest thumbnail width for a given original file size
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* such that the thumbnail's height is at most $maxHeight.
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* @param $boxWidth Integer Width of the thumbnail box.
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* @param $boxHeight Integer Height of the thumbnail box.
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* @param $maxHeight Integer Maximum height expected for the thumbnail.
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* @return Integer.
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*/
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function wfFitBoxWidth( $boxWidth, $boxHeight, $maxHeight ) {
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$idealWidth = $boxWidth * $maxHeight / $boxHeight;
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$roundedUp = ceil( $idealWidth );
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if( round( $roundedUp * $boxHeight / $boxWidth ) > $maxHeight )
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return floor( $idealWidth );
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else
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return $roundedUp;
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}
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