<?php
+/**
+ * Global functions related to images
+ *
+ * @file
+ */
+
/**
* Return a rounded pixel equivalent for a labeled CSS/SVG length.
* http://www.w3.org/TR/SVG11/coords.html#UnitIdentifiers
*
* @param $length String: CSS/SVG length.
- * @return Integer: length in pixels
+ * @param $viewportSize: Float optional scale for percentage units...
+ * @return float: length in pixels
*/
-function wfScaleSVGUnit( $length ) {
+function wfScaleSVGUnit( $length, $viewportSize=512 ) {
static $unitLength = array(
'px' => 1.0,
'pt' => 1.25,
'mm' => 3.543307,
'cm' => 35.43307,
'in' => 90.0,
+ 'em' => 16.0, // fake it?
+ 'ex' => 12.0, // fake it?
'' => 1.0, // "User units" pixels by default
- '%' => 2.0, // Fake it!
);
$matches = array();
- if( preg_match( '/^(\d+(?:\.\d+)?)(em|ex|px|pt|pc|cm|mm|in|%|)$/', $length, $matches ) ) {
+ if( preg_match( '/^\s*(\d+(?:\.\d+)?)(em|ex|px|pt|pc|cm|mm|in|%|)\s*$/', $length, $matches ) ) {
$length = floatval( $matches[1] );
$unit = $matches[2];
- return round( $length * $unitLength[$unit] );
+ if( $unit == '%' ) {
+ return $length * 0.01 * $viewportSize;
+ } else {
+ return $length * $unitLength[$unit];
+ }
} else {
// Assume pixels
- return round( floatval( $length ) );
+ return floatval( $length );
+ }
+}
+
+class XmlSizeFilter {
+ const DEFAULT_WIDTH = 512;
+ const DEFAULT_HEIGHT = 512;
+ var $first = true;
+ var $width = self::DEFAULT_WIDTH;
+ var $height = self::DEFAULT_HEIGHT;
+ function filter( $name, $attribs ) {
+ if( $this->first ) {
+ $defaultWidth = self::DEFAULT_WIDTH;
+ $defaultHeight = self::DEFAULT_HEIGHT;
+ $aspect = 1.0;
+ $width = null;
+ $height = null;
+
+ if( isset( $attribs['viewBox'] ) ) {
+ // min-x min-y width height
+ $viewBox = preg_split( '/\s+/', trim( $attribs['viewBox'] ) );
+ if( count( $viewBox ) == 4 ) {
+ $viewWidth = wfScaleSVGUnit( $viewBox[2] );
+ $viewHeight = wfScaleSVGUnit( $viewBox[3] );
+ if( $viewWidth > 0 && $viewHeight > 0 ) {
+ $aspect = $viewWidth / $viewHeight;
+ $defaultHeight = $defaultWidth / $aspect;
+ }
+ }
+ }
+ if( isset( $attribs['width'] ) ) {
+ $width = wfScaleSVGUnit( $attribs['width'], $defaultWidth );
+ }
+ if( isset( $attribs['height'] ) ) {
+ $height = wfScaleSVGUnit( $attribs['height'], $defaultHeight );
+ }
+
+ if( !isset( $width ) && !isset( $height ) ) {
+ $width = $defaultWidth;
+ $height = $width / $aspect;
+ } elseif( isset( $width ) && !isset( $height ) ) {
+ $height = $width / $aspect;
+ } elseif( isset( $height ) && !isset( $width ) ) {
+ $width = $height * $aspect;
+ }
+
+ if( $width > 0 && $height > 0 ) {
+ $this->width = intval( round( $width ) );
+ $this->height = intval( round( $height ) );
+ }
+
+ $this->first = false;
+ }
}
}
* @return array
*/
function wfGetSVGsize( $filename ) {
- $width = 256;
- $height = 256;
-
- // Read a chunk of the file
- $f = fopen( $filename, "rt" );
- if( !$f ) return false;
- $chunk = fread( $f, 4096 );
- fclose( $f );
-
- // Uber-crappy hack! Run through a real XML parser.
- $matches = array();
- if( !preg_match( '/<svg\s*([^>]*)\s*>/s', $chunk, $matches ) ) {
- return false;
- }
- $tag = $matches[1];
- if( preg_match( '/(?:^|\s)width\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
- $width = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
- }
- if( preg_match( '/(?:^|\s)height\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
- $height = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
+ $filter = new XmlSizeFilter();
+ $xml = new XmlTypeCheck( $filename, array( $filter, 'filter' ) );
+ if( $xml->wellFormed ) {
+ return array( $filter->width, $filter->height, 'SVG',
+ "width=\"$filter->width\" height=\"$filter->height\"" );
}
-
- return array( $width, $height, 'SVG',
- "width=\"$width\" height=\"$height\"" );
+
+ return false;
}
/**
static $badImages = false;
wfProfileIn( __METHOD__ );
+ # Handle redirects
+ $redirectTitle = RepoGroup::singleton()->checkRedirect( Title::makeTitle( NS_FILE, $name ) );
+ if( $redirectTitle ) {
+ $name = $redirectTitle->getDbKey();
+ }
+
# Run the extension hook
$bad = false;
if( !wfRunHooks( 'BadImage', array( $name, &$bad ) ) ) {