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<?php
/**
* @addtogroup Media
*/
class BitmapHandler extends ImageHandler {
function normaliseParams( $image, &$params ) {
global $wgMaxImageArea;
if ( !parent::normaliseParams( $image, $params ) ) {
return false;
}
$mimeType = $image->getMimeType();
$srcWidth = $image->getWidth( $params['page'] );
$srcHeight = $image->getHeight( $params['page'] );
# Don't thumbnail an image so big that it will fill hard drives and send servers into swap
# JPEG has the handy property of allowing thumbnailing without full decompression, so we make
# an exception for it.
if ( $mimeType !== 'image/jpeg' &&
$srcWidth * $srcHeight > $wgMaxImageArea )
{
return false;
}
# Don't make an image bigger than the source
$params['physicalWidth'] = $params['width'];
$params['physicalHeight'] = $params['height'];
if ( $params['physicalWidth'] >= $srcWidth ) {
$params['physicalWidth'] = $srcWidth;
$params['physicalHeight'] = $srcHeight;
return true;
}
return true;
}
function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
global $wgUseImageMagick, $wgImageMagickConvertCommand;
global $wgCustomConvertCommand;
global $wgSharpenParameter, $wgSharpenReductionThreshold;
if ( !$this->normaliseParams( $image, $params ) ) {
return new TransformParameterError( $params );
}
$physicalWidth = $params['physicalWidth'];
$physicalHeight = $params['physicalHeight'];
$clientWidth = $params['width'];
$clientHeight = $params['height'];
$srcWidth = $image->getWidth();
$srcHeight = $image->getHeight();
$mimeType = $image->getMimeType();
$srcPath = $image->getImagePath();
$retval = 0;
wfDebug( __METHOD__.": creating {$physicalWidth}x{$physicalHeight} thumbnail at $dstPath\n" );
if ( $physicalWidth == $srcWidth && $physicalHeight == $srcHeight ) {
# normaliseParams (or the user) wants us to return the unscaled image
wfDebug( __METHOD__.": returning unscaled image\n" );
return new ThumbnailImage( $image->getURL(), $clientWidth, $clientHeight, $srcPath );
}
if ( $wgUseImageMagick ) {
$scaler = 'im';
} elseif ( $wgCustomConvertCommand ) {
$scaler = 'custom';
} elseif ( function_exists( 'imagecreatetruecolor' ) ) {
$scaler = 'gd';
} else {
$scaler = 'client';
}
if ( $scaler == 'client' ) {
# Client-side image scaling, use the source URL
# Using the destination URL in a TRANSFORM_LATER request would be incorrect
return new ThumbnailImage( $image->getURL(), $clientWidth, $clientHeight, $srcPath );
}
if ( $flags & self::TRANSFORM_LATER ) {
return new ThumbnailImage( $dstUrl, $clientWidth, $clientHeight, $dstPath );
}
if ( !wfMkdirParents( dirname( $dstPath ) ) ) {
return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight,
wfMsg( 'thumbnail_dest_directory' ) );
}
if ( $scaler == 'im' ) {
# use ImageMagick
$sharpen = '';
if ( $mimeType == 'image/jpeg' ) {
$quality = "-quality 80"; // 80%
# Sharpening, see bug 6193
if ( ( $physicalWidth + $physicalHeight ) / ( $srcWidth + $srcHeight ) < $wgSharpenReductionThreshold ) {
$sharpen = "-sharpen " . wfEscapeShellArg( $wgSharpenParameter );
}
} elseif ( $mimeType == 'image/png' ) {
$quality = "-quality 95"; // zlib 9, adaptive filtering
} else {
$quality = ''; // default
}
# Specify white background color, will be used for transparent images
# in Internet Explorer/Windows instead of default black.
# Note, we specify "-size {$physicalWidth}" and NOT "-size {$physicalWidth}x{$physicalHeight}".
# It seems that ImageMagick has a bug wherein it produces thumbnails of
# the wrong size in the second case.
$cmd = wfEscapeShellArg($wgImageMagickConvertCommand) .
" {$quality} -background white -size {$physicalWidth} ".
wfEscapeShellArg($srcPath) .
// Coalesce is needed to scale animated GIFs properly (bug 1017).
' -coalesce ' .
// For the -resize option a "!" is needed to force exact size,
// or ImageMagick may decide your ratio is wrong and slice off
// a pixel.
" -thumbnail " . wfEscapeShellArg( "{$physicalWidth}x{$physicalHeight}!" ) .
" -depth 8 $sharpen " .
wfEscapeShellArg($dstPath) . " 2>&1";
wfDebug( __METHOD__.": running ImageMagick: $cmd\n");
wfProfileIn( 'convert' );
$err = wfShellExec( $cmd, $retval );
wfProfileOut( 'convert' );
} elseif( $scaler == 'custom' ) {
# Use a custom convert command
# Variables: %s %d %w %h
$src = wfEscapeShellArg( $srcPath );
$dst = wfEscapeShellArg( $dstPath );
$cmd = $wgCustomConvertCommand;
$cmd = str_replace( '%s', $src, str_replace( '%d', $dst, $cmd ) ); # Filenames
$cmd = str_replace( '%h', $physicalHeight, str_replace( '%w', $physicalWidth, $cmd ) ); # Size
wfDebug( __METHOD__.": Running custom convert command $cmd\n" );
wfProfileIn( 'convert' );
$err = wfShellExec( $cmd, $retval );
wfProfileOut( 'convert' );
} else /* $scaler == 'gd' */ {
# Use PHP's builtin GD library functions.
#
# First find out what kind of file this is, and select the correct
# input routine for this.
$typemap = array(
'image/gif' => array( 'imagecreatefromgif', 'palette', 'imagegif' ),
'image/jpeg' => array( 'imagecreatefromjpeg', 'truecolor', array( __CLASS__, 'imageJpegWrapper' ) ),
'image/png' => array( 'imagecreatefrompng', 'bits', 'imagepng' ),
'image/vnd.wap.wbmp' => array( 'imagecreatefromwbmp', 'palette', 'imagewbmp' ),
'image/xbm' => array( 'imagecreatefromxbm', 'palette', 'imagexbm' ),
);
if( !isset( $typemap[$mimeType] ) ) {
$err = 'Image type not supported';
wfDebug( "$err\n" );
return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight, $err );
}
list( $loader, $colorStyle, $saveType ) = $typemap[$mimeType];
if( !function_exists( $loader ) ) {
$err = "Incomplete GD library configuration: missing function $loader";
wfDebug( "$err\n" );
return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight, $err );
}
$src_image = call_user_func( $loader, $srcPath );
$dst_image = imagecreatetruecolor( $physicalWidth, $physicalHeight );
imagecopyresampled( $dst_image, $src_image,
0,0,0,0,
$physicalWidth, $physicalHeight, imagesx( $src_image ), imagesy( $src_image ) );
call_user_func( $saveType, $dst_image, $dstPath );
imagedestroy( $dst_image );
imagedestroy( $src_image );
$retval = 0;
}
$removed = $this->removeBadFile( $dstPath, $retval );
if ( $retval != 0 || $removed ) {
wfDebugLog( 'thumbnail',
sprintf( 'thumbnail failed on %s: error %d "%s" from "%s"',
wfHostname(), $retval, trim($err), $cmd ) );
return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight, $err );
} else {
return new ThumbnailImage( $dstUrl, $clientWidth, $clientHeight, $dstPath );
}
}
static function imageJpegWrapper( $dst_image, $thumbPath ) {
imageinterlace( $dst_image );
imagejpeg( $dst_image, $thumbPath, 95 );
}
function getMetadata( $image, $filename ) {
global $wgShowEXIF;
if( $wgShowEXIF && file_exists( $filename ) ) {
$exif = new Exif( $filename );
$data = $exif->getFilteredData();
if ( $data ) {
$data['MEDIAWIKI_EXIF_VERSION'] = Exif::version();
return serialize( $data );
} else {
return '0';
}
} else {
return '';
}
}
function getMetadataType( $image ) {
return 'exif';
}
function isMetadataValid( $image, $metadata ) {
global $wgShowEXIF;
if ( !$wgShowEXIF ) {
# Metadata disabled and so an empty field is expected
return true;
}
if ( $metadata === '0' ) {
# Special value indicating that there is no EXIF data in the file
return true;
}
$exif = @unserialize( $metadata );
if ( !isset( $exif['MEDIAWIKI_EXIF_VERSION'] ) ||
$exif['MEDIAWIKI_EXIF_VERSION'] != Exif::version() )
{
# Wrong version
wfDebug( __METHOD__.": wrong version\n" );
return false;
}
return true;
}
}
?>
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