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<?php
/**
* Generic handler for bitmap images.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Media
*/
/**
* Generic handler for bitmap images
*
* @ingroup Media
*/
class BitmapHandler extends ImageHandler {
/**
* @param $image File
* @param array $params Transform parameters. Entries with the keys 'width'
* and 'height' are the respective screen width and height, while the keys
* 'physicalWidth' and 'physicalHeight' indicate the thumbnail dimensions.
* @return bool
*/
function normaliseParams( $image, &$params ) {
if ( !parent::normaliseParams( $image, $params ) ) {
return false;
}
# Obtain the source, pre-rotation dimensions
$srcWidth = $image->getWidth( $params['page'] );
$srcHeight = $image->getHeight( $params['page'] );
# Don't make an image bigger than the source
if ( $params['physicalWidth'] >= $srcWidth ) {
$params['physicalWidth'] = $srcWidth;
$params['physicalHeight'] = $srcHeight;
# Skip scaling limit checks if no scaling is required
# due to requested size being bigger than source.
if ( !$image->mustRender() ) {
return true;
}
}
# Check if the file is smaller than the maximum image area for thumbnailing
$checkImageAreaHookResult = null;
wfRunHooks( 'BitmapHandlerCheckImageArea', array( $image, &$params, &$checkImageAreaHookResult ) );
if ( is_null( $checkImageAreaHookResult ) ) {
global $wgMaxImageArea;
if ( $srcWidth * $srcHeight > $wgMaxImageArea &&
!( $image->getMimeType() == 'image/jpeg' &&
self::getScalerType( false, false ) == 'im' ) ) {
# Only ImageMagick can efficiently downsize jpg images without loading
# the entire file in memory
return false;
}
} else {
return $checkImageAreaHookResult;
}
return true;
}
/**
* Extracts the width/height if the image will be scaled before rotating
*
* This will match the physical size/aspect ratio of the original image
* prior to application of the rotation -- so for a portrait image that's
* stored as raw landscape with 90-degress rotation, the resulting size
* will be wider than it is tall.
*
* @param array $params Parameters as returned by normaliseParams
* @param int $rotation The rotation angle that will be applied
* @return array ($width, $height) array
*/
public function extractPreRotationDimensions( $params, $rotation ) {
if ( $rotation == 90 || $rotation == 270 ) {
# We'll resize before rotation, so swap the dimensions again
$width = $params['physicalHeight'];
$height = $params['physicalWidth'];
} else {
$width = $params['physicalWidth'];
$height = $params['physicalHeight'];
}
return array( $width, $height );
}
/**
* @param $image File
* @param $dstPath
* @param $dstUrl
* @param $params
* @param int $flags
* @return MediaTransformError|ThumbnailImage|TransformParameterError
*/
function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
if ( !$this->normaliseParams( $image, $params ) ) {
return new TransformParameterError( $params );
}
# Create a parameter array to pass to the scaler
$scalerParams = array(
# The size to which the image will be resized
'physicalWidth' => $params['physicalWidth'],
'physicalHeight' => $params['physicalHeight'],
'physicalDimensions' => "{$params['physicalWidth']}x{$params['physicalHeight']}",
# The size of the image on the page
'clientWidth' => $params['width'],
'clientHeight' => $params['height'],
# Comment as will be added to the Exif of the thumbnail
'comment' => isset( $params['descriptionUrl'] ) ?
"File source: {$params['descriptionUrl']}" : '',
# Properties of the original image
'srcWidth' => $image->getWidth(),
'srcHeight' => $image->getHeight(),
'mimeType' => $image->getMimeType(),
'dstPath' => $dstPath,
'dstUrl' => $dstUrl,
);
# Determine scaler type
$scaler = self::getScalerType( $dstPath );
wfDebug( __METHOD__ . ": creating {$scalerParams['physicalDimensions']} thumbnail at $dstPath using scaler $scaler\n" );
if ( !$image->mustRender() &&
$scalerParams['physicalWidth'] == $scalerParams['srcWidth']
&& $scalerParams['physicalHeight'] == $scalerParams['srcHeight'] ) {
# normaliseParams (or the user) wants us to return the unscaled image
wfDebug( __METHOD__ . ": returning unscaled image\n" );
return $this->getClientScalingThumbnailImage( $image, $scalerParams );
}
if ( $scaler == 'client' ) {
# Client-side image scaling, use the source URL
# Using the destination URL in a TRANSFORM_LATER request would be incorrect
return $this->getClientScalingThumbnailImage( $image, $scalerParams );
}
if ( $flags & self::TRANSFORM_LATER ) {
wfDebug( __METHOD__ . ": Transforming later per flags.\n" );
$params = array(
'width' => $scalerParams['clientWidth'],
'height' => $scalerParams['clientHeight']
);
return new ThumbnailImage( $image, $dstUrl, false, $params );
}
# Try to make a target path for the thumbnail
if ( !wfMkdirParents( dirname( $dstPath ), null, __METHOD__ ) ) {
wfDebug( __METHOD__ . ": Unable to create thumbnail destination directory, falling back to client scaling\n" );
return $this->getClientScalingThumbnailImage( $image, $scalerParams );
}
# Transform functions and binaries need a FS source file
$scalerParams['srcPath'] = $image->getLocalRefPath();
# Try a hook
$mto = null;
wfRunHooks( 'BitmapHandlerTransform', array( $this, $image, &$scalerParams, &$mto ) );
if ( !is_null( $mto ) ) {
wfDebug( __METHOD__ . ": Hook to BitmapHandlerTransform created an mto\n" );
$scaler = 'hookaborted';
}
switch ( $scaler ) {
case 'hookaborted':
# Handled by the hook above
$err = $mto->isError() ? $mto : false;
break;
case 'im':
$err = $this->transformImageMagick( $image, $scalerParams );
break;
case 'custom':
$err = $this->transformCustom( $image, $scalerParams );
break;
case 'imext':
$err = $this->transformImageMagickExt( $image, $scalerParams );
break;
case 'gd':
default:
$err = $this->transformGd( $image, $scalerParams );
break;
}
# Remove the file if a zero-byte thumbnail was created, or if there was an error
$removed = $this->removeBadFile( $dstPath, (bool)$err );
if ( $err ) {
# transform returned MediaTransforError
return $err;
} elseif ( $removed ) {
# Thumbnail was zero-byte and had to be removed
return new MediaTransformError( 'thumbnail_error',
$scalerParams['clientWidth'], $scalerParams['clientHeight'] );
} elseif ( $mto ) {
return $mto;
} else {
$params = array(
'width' => $scalerParams['clientWidth'],
'height' => $scalerParams['clientHeight']
);
return new ThumbnailImage( $image, $dstUrl, $dstPath, $params );
}
}
/**
* Returns which scaler type should be used. Creates parent directories
* for $dstPath and returns 'client' on error
*
* @return string client,im,custom,gd
*/
protected static function getScalerType( $dstPath, $checkDstPath = true ) {
global $wgUseImageResize, $wgUseImageMagick, $wgCustomConvertCommand;
if ( !$dstPath && $checkDstPath ) {
# No output path available, client side scaling only
$scaler = 'client';
} elseif ( !$wgUseImageResize ) {
$scaler = 'client';
} elseif ( $wgUseImageMagick ) {
$scaler = 'im';
} elseif ( $wgCustomConvertCommand ) {
$scaler = 'custom';
} elseif ( function_exists( 'imagecreatetruecolor' ) ) {
$scaler = 'gd';
} elseif ( class_exists( 'Imagick' ) ) {
$scaler = 'imext';
} else {
$scaler = 'client';
}
return $scaler;
}
/**
* Get a ThumbnailImage that respresents an image that will be scaled
* client side
*
* @param $image File File associated with this thumbnail
* @param array $scalerParams Array with scaler params
* @return ThumbnailImage
*
* @todo fixme: no rotation support
*/
protected function getClientScalingThumbnailImage( $image, $scalerParams ) {
$params = array(
'width' => $scalerParams['clientWidth'],
'height' => $scalerParams['clientHeight']
);
return new ThumbnailImage( $image, $image->getURL(), null, $params );
}
/**
* Transform an image using ImageMagick
*
* @param $image File File associated with this thumbnail
* @param array $params Array with scaler params
*
* @return MediaTransformError Error object if error occurred, false (=no error) otherwise
*/
protected function transformImageMagick( $image, $params ) {
# use ImageMagick
global $wgSharpenReductionThreshold, $wgSharpenParameter,
$wgMaxAnimatedGifArea,
$wgImageMagickTempDir, $wgImageMagickConvertCommand;
$quality = '';
$sharpen = '';
$scene = false;
$animation_pre = '';
$animation_post = '';
$decoderHint = '';
if ( $params['mimeType'] == 'image/jpeg' ) {
$quality = "-quality 80"; // 80%
# Sharpening, see bug 6193
if ( ( $params['physicalWidth'] + $params['physicalHeight'] )
/ ( $params['srcWidth'] + $params['srcHeight'] )
< $wgSharpenReductionThreshold ) {
$sharpen = "-sharpen " . wfEscapeShellArg( $wgSharpenParameter );
}
if ( version_compare( $this->getMagickVersion(), "6.5.6" ) >= 0 ) {
// JPEG decoder hint to reduce memory, available since IM 6.5.6-2
$decoderHint = "-define jpeg:size={$params['physicalDimensions']}";
}
} elseif ( $params['mimeType'] == 'image/png' ) {
$quality = "-quality 95"; // zlib 9, adaptive filtering
} elseif ( $params['mimeType'] == 'image/gif' ) {
if ( $this->getImageArea( $image ) > $wgMaxAnimatedGifArea ) {
// Extract initial frame only; we're so big it'll
// be a total drag. :P
$scene = 0;
} elseif ( $this->isAnimatedImage( $image ) ) {
// Coalesce is needed to scale animated GIFs properly (bug 1017).
$animation_pre = '-coalesce';
// We optimize the output, but -optimize is broken,
// use optimizeTransparency instead (bug 11822)
if ( version_compare( $this->getMagickVersion(), "6.3.5" ) >= 0 ) {
$animation_post = '-fuzz 5% -layers optimizeTransparency';
}
}
} elseif ( $params['mimeType'] == 'image/x-xcf' ) {
$animation_post = '-layers merge';
}
// Use one thread only, to avoid deadlock bugs on OOM
$env = array( 'OMP_NUM_THREADS' => 1 );
if ( strval( $wgImageMagickTempDir ) !== '' ) {
$env['MAGICK_TMPDIR'] = $wgImageMagickTempDir;
}
$rotation = $this->getRotation( $image );
list( $width, $height ) = $this->extractPreRotationDimensions( $params, $rotation );
$cmd =
wfEscapeShellArg( $wgImageMagickConvertCommand ) .
// Specify white background color, will be used for transparent images
// in Internet Explorer/Windows instead of default black.
" {$quality} -background white" .
" {$decoderHint} " .
wfEscapeShellArg( $this->escapeMagickInput( $params['srcPath'], $scene ) ) .
" {$animation_pre}" .
// For the -thumbnail option a "!" is needed to force exact size,
// or ImageMagick may decide your ratio is wrong and slice off
// a pixel.
" -thumbnail " . wfEscapeShellArg( "{$width}x{$height}!" ) .
// Add the source url as a comment to the thumb, but don't add the flag if there's no comment
( $params['comment'] !== ''
? " -set comment " . wfEscapeShellArg( $this->escapeMagickProperty( $params['comment'] ) )
: '' ) .
" -depth 8 $sharpen " .
" -rotate -$rotation " .
" {$animation_post} " .
wfEscapeShellArg( $this->escapeMagickOutput( $params['dstPath'] ) );
wfDebug( __METHOD__ . ": running ImageMagick: $cmd\n" );
wfProfileIn( 'convert' );
$retval = 0;
$err = wfShellExecWithStderr( $cmd, $retval, $env );
wfProfileOut( 'convert' );
if ( $retval !== 0 ) {
$this->logErrorForExternalProcess( $retval, $err, $cmd );
return $this->getMediaTransformError( $params, $err );
}
return false; # No error
}
/**
* Transform an image using the Imagick PHP extension
*
* @param $image File File associated with this thumbnail
* @param array $params Array with scaler params
*
* @return MediaTransformError Error object if error occurred, false (=no error) otherwise
*/
protected function transformImageMagickExt( $image, $params ) {
global $wgSharpenReductionThreshold, $wgSharpenParameter, $wgMaxAnimatedGifArea;
try {
$im = new Imagick();
$im->readImage( $params['srcPath'] );
if ( $params['mimeType'] == 'image/jpeg' ) {
// Sharpening, see bug 6193
if ( ( $params['physicalWidth'] + $params['physicalHeight'] )
/ ( $params['srcWidth'] + $params['srcHeight'] )
< $wgSharpenReductionThreshold ) {
// Hack, since $wgSharpenParamater is written specifically for the command line convert
list( $radius, $sigma ) = explode( 'x', $wgSharpenParameter );
$im->sharpenImage( $radius, $sigma );
}
$im->setCompressionQuality( 80 );
} elseif ( $params['mimeType'] == 'image/png' ) {
$im->setCompressionQuality( 95 );
} elseif ( $params['mimeType'] == 'image/gif' ) {
if ( $this->getImageArea( $image ) > $wgMaxAnimatedGifArea ) {
// Extract initial frame only; we're so big it'll
// be a total drag. :P
$im->setImageScene( 0 );
} elseif ( $this->isAnimatedImage( $image ) ) {
// Coalesce is needed to scale animated GIFs properly (bug 1017).
$im = $im->coalesceImages();
}
}
$rotation = $this->getRotation( $image );
list( $width, $height ) = $this->extractPreRotationDimensions( $params, $rotation );
$im->setImageBackgroundColor( new ImagickPixel( 'white' ) );
// Call Imagick::thumbnailImage on each frame
foreach ( $im as $i => $frame ) {
if ( !$frame->thumbnailImage( $width, $height, /* fit */ false ) ) {
return $this->getMediaTransformError( $params, "Error scaling frame $i" );
}
}
$im->setImageDepth( 8 );
if ( $rotation ) {
if ( !$im->rotateImage( new ImagickPixel( 'white' ), 360 - $rotation ) ) {
return $this->getMediaTransformError( $params, "Error rotating $rotation degrees" );
}
}
if ( $this->isAnimatedImage( $image ) ) {
wfDebug( __METHOD__ . ": Writing animated thumbnail\n" );
// This is broken somehow... can't find out how to fix it
$result = $im->writeImages( $params['dstPath'], true );
} else {
$result = $im->writeImage( $params['dstPath'] );
}
if ( !$result ) {
return $this->getMediaTransformError( $params,
"Unable to write thumbnail to {$params['dstPath']}" );
}
} catch ( ImagickException $e ) {
return $this->getMediaTransformError( $params, $e->getMessage() );
}
return false;
}
/**
* Transform an image using a custom command
*
* @param $image File File associated with this thumbnail
* @param array $params Array with scaler params
*
* @return MediaTransformError Error object if error occurred, false (=no error) otherwise
*/
protected function transformCustom( $image, $params ) {
# Use a custom convert command
global $wgCustomConvertCommand;
# Variables: %s %d %w %h
$src = wfEscapeShellArg( $params['srcPath'] );
$dst = wfEscapeShellArg( $params['dstPath'] );
$cmd = $wgCustomConvertCommand;
$cmd = str_replace( '%s', $src, str_replace( '%d', $dst, $cmd ) ); # Filenames
$cmd = str_replace( '%h', $params['physicalHeight'],
str_replace( '%w', $params['physicalWidth'], $cmd ) ); # Size
wfDebug( __METHOD__ . ": Running custom convert command $cmd\n" );
wfProfileIn( 'convert' );
$retval = 0;
$err = wfShellExecWithStderr( $cmd, $retval );
wfProfileOut( 'convert' );
if ( $retval !== 0 ) {
$this->logErrorForExternalProcess( $retval, $err, $cmd );
return $this->getMediaTransformError( $params, $err );
}
return false; # No error
}
/**
* Log an error that occurred in an external process
*
* @param $retval int
* @param $err int
* @param $cmd string
*/
protected function logErrorForExternalProcess( $retval, $err, $cmd ) {
wfDebugLog( 'thumbnail',
sprintf( 'thumbnail failed on %s: error %d "%s" from "%s"',
wfHostname(), $retval, trim( $err ), $cmd ) );
}
/**
* Get a MediaTransformError with error 'thumbnail_error'
*
* @param array $params Parameter array as passed to the transform* functions
* @param string $errMsg Error message
* @return MediaTransformError
*/
public function getMediaTransformError( $params, $errMsg ) {
return new MediaTransformError( 'thumbnail_error', $params['clientWidth'],
$params['clientHeight'], $errMsg );
}
/**
* Transform an image using the built in GD library
*
* @param $image File File associated with this thumbnail
* @param array $params Array with scaler params
*
* @return MediaTransformError Error object if error occurred, false (=no error) otherwise
*/
protected function transformGd( $image, $params ) {
# 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( $typemap[$params['mimeType']] ) ) {
$err = 'Image type not supported';
wfDebug( "$err\n" );
$errMsg = wfMessage( 'thumbnail_image-type' )->text();
return $this->getMediaTransformError( $params, $errMsg );
}
list( $loader, $colorStyle, $saveType ) = $typemap[$params['mimeType']];
if ( !function_exists( $loader ) ) {
$err = "Incomplete GD library configuration: missing function $loader";
wfDebug( "$err\n" );
$errMsg = wfMessage( 'thumbnail_gd-library', $loader )->text();
return $this->getMediaTransformError( $params, $errMsg );
}
if ( !file_exists( $params['srcPath'] ) ) {
$err = "File seems to be missing: {$params['srcPath']}";
wfDebug( "$err\n" );
$errMsg = wfMessage( 'thumbnail_image-missing', $params['srcPath'] )->text();
return $this->getMediaTransformError( $params, $errMsg );
}
$src_image = call_user_func( $loader, $params['srcPath'] );
$rotation = function_exists( 'imagerotate' ) ? $this->getRotation( $image ) : 0;
list( $width, $height ) = $this->extractPreRotationDimensions( $params, $rotation );
$dst_image = imagecreatetruecolor( $width, $height );
// Initialise the destination image to transparent instead of
// the default solid black, to support PNG and GIF transparency nicely
$background = imagecolorallocate( $dst_image, 0, 0, 0 );
imagecolortransparent( $dst_image, $background );
imagealphablending( $dst_image, false );
if ( $colorStyle == 'palette' ) {
// Don't resample for paletted GIF images.
// It may just uglify them, and completely breaks transparency.
imagecopyresized( $dst_image, $src_image,
0, 0, 0, 0,
$width, $height,
imagesx( $src_image ), imagesy( $src_image ) );
} else {
imagecopyresampled( $dst_image, $src_image,
0, 0, 0, 0,
$width, $height,
imagesx( $src_image ), imagesy( $src_image ) );
}
if ( $rotation % 360 != 0 && $rotation % 90 == 0 ) {
$rot_image = imagerotate( $dst_image, $rotation, 0 );
imagedestroy( $dst_image );
$dst_image = $rot_image;
}
imagesavealpha( $dst_image, true );
call_user_func( $saveType, $dst_image, $params['dstPath'] );
imagedestroy( $dst_image );
imagedestroy( $src_image );
return false; # No error
}
/**
* Escape a string for ImageMagick's property input (e.g. -set -comment)
* See InterpretImageProperties() in magick/property.c
* @return mixed|string
*/
function escapeMagickProperty( $s ) {
// Double the backslashes
$s = str_replace( '\\', '\\\\', $s );
// Double the percents
$s = str_replace( '%', '%%', $s );
// Escape initial - or @
if ( strlen( $s ) > 0 && ( $s[0] === '-' || $s[0] === '@' ) ) {
$s = '\\' . $s;
}
return $s;
}
/**
* Escape a string for ImageMagick's input filenames. See ExpandFilenames()
* and GetPathComponent() in magick/utility.c.
*
* This won't work with an initial ~ or @, so input files should be prefixed
* with the directory name.
*
* Glob character unescaping is broken in ImageMagick before 6.6.1-5, but
* it's broken in a way that doesn't involve trying to convert every file
* in a directory, so we're better off escaping and waiting for the bugfix
* to filter down to users.
*
* @param string $path The file path
* @param bool|string $scene The scene specification, or false if there is none
* @throws MWException
* @return string
*/
function escapeMagickInput( $path, $scene = false ) {
# Die on initial metacharacters (caller should prepend path)
$firstChar = substr( $path, 0, 1 );
if ( $firstChar === '~' || $firstChar === '@' ) {
throw new MWException( __METHOD__ . ': cannot escape this path name' );
}
# Escape glob chars
$path = preg_replace( '/[*?\[\]{}]/', '\\\\\0', $path );
return $this->escapeMagickPath( $path, $scene );
}
/**
* Escape a string for ImageMagick's output filename. See
* InterpretImageFilename() in magick/image.c.
* @return string
*/
function escapeMagickOutput( $path, $scene = false ) {
$path = str_replace( '%', '%%', $path );
return $this->escapeMagickPath( $path, $scene );
}
/**
* Armour a string against ImageMagick's GetPathComponent(). This is a
* helper function for escapeMagickInput() and escapeMagickOutput().
*
* @param string $path The file path
* @param bool|string $scene The scene specification, or false if there is none
* @throws MWException
* @return string
*/
protected function escapeMagickPath( $path, $scene = false ) {
# Die on format specifiers (other than drive letters). The regex is
# meant to match all the formats you get from "convert -list format"
if ( preg_match( '/^([a-zA-Z0-9-]+):/', $path, $m ) ) {
if ( wfIsWindows() && is_dir( $m[0] ) ) {
// OK, it's a drive letter
// ImageMagick has a similar exception, see IsMagickConflict()
} else {
throw new MWException( __METHOD__ . ': unexpected colon character in path name' );
}
}
# If there are square brackets, add a do-nothing scene specification
# to force a literal interpretation
if ( $scene === false ) {
if ( strpos( $path, '[' ) !== false ) {
$path .= '[0--1]';
}
} else {
$path .= "[$scene]";
}
return $path;
}
/**
* Retrieve the version of the installed ImageMagick
* You can use PHPs version_compare() to use this value
* Value is cached for one hour.
* @return String representing the IM version.
*/
protected function getMagickVersion() {
global $wgMemc;
$cache = $wgMemc->get( "imagemagick-version" );
if ( !$cache ) {
global $wgImageMagickConvertCommand;
$cmd = wfEscapeShellArg( $wgImageMagickConvertCommand ) . ' -version';
wfDebug( __METHOD__ . ": Running convert -version\n" );
$retval = '';
$return = wfShellExec( $cmd, $retval );
$x = preg_match( '/Version: ImageMagick ([0-9]*\.[0-9]*\.[0-9]*)/', $return, $matches );
if ( $x != 1 ) {
wfDebug( __METHOD__ . ": ImageMagick version check failed\n" );
return null;
}
$wgMemc->set( "imagemagick-version", $matches[1], 3600 );
return $matches[1];
}
return $cache;
}
static function imageJpegWrapper( $dst_image, $thumbPath ) {
imageinterlace( $dst_image );
imagejpeg( $dst_image, $thumbPath, 95 );
}
/**
* Returns whether the current scaler supports rotation (im and gd do)
*
* @return bool
*/
public static function canRotate() {
$scaler = self::getScalerType( null, false );
switch ( $scaler ) {
case 'im':
# ImageMagick supports autorotation
return true;
case 'imext':
# Imagick::rotateImage
return true;
case 'gd':
# GD's imagerotate function is used to rotate images, but not
# all precompiled PHP versions have that function
return function_exists( 'imagerotate' );
default:
# Other scalers don't support rotation
return false;
}
}
/**
* @param $file File
* @param array $params Rotate parameters.
* 'rotation' clockwise rotation in degrees, allowed are multiples of 90
* @since 1.21
* @return bool
*/
public function rotate( $file, $params ) {
global $wgImageMagickConvertCommand;
$rotation = ( $params['rotation'] + $this->getRotation( $file ) ) % 360;
$scene = false;
$scaler = self::getScalerType( null, false );
switch ( $scaler ) {
case 'im':
$cmd = wfEscapeShellArg( $wgImageMagickConvertCommand ) . " " .
wfEscapeShellArg( $this->escapeMagickInput( $params['srcPath'], $scene ) ) .
" -rotate -$rotation " .
wfEscapeShellArg( $this->escapeMagickOutput( $params['dstPath'] ) );
wfDebug( __METHOD__ . ": running ImageMagick: $cmd\n" );
wfProfileIn( 'convert' );
$retval = 0;
$err = wfShellExecWithStderr( $cmd, $retval, $env );
wfProfileOut( 'convert' );
if ( $retval !== 0 ) {
$this->logErrorForExternalProcess( $retval, $err, $cmd );
return new MediaTransformError( 'thumbnail_error', 0, 0, $err );
}
return false;
case 'imext':
$im = new Imagick();
$im->readImage( $params['srcPath'] );
if ( !$im->rotateImage( new ImagickPixel( 'white' ), 360 - $rotation ) ) {
return new MediaTransformError( 'thumbnail_error', 0, 0,
"Error rotating $rotation degrees" );
}
$result = $im->writeImage( $params['dstPath'] );
if ( !$result ) {
return new MediaTransformError( 'thumbnail_error', 0, 0,
"Unable to write image to {$params['dstPath']}" );
}
return false;
default:
return new MediaTransformError( 'thumbnail_error', 0, 0,
"$scaler rotation not implemented" );
}
}
/**
* Rerurns whether the file needs to be rendered. Returns true if the
* file requires rotation and we are able to rotate it.
*
* @param $file File
* @return bool
*/
public function mustRender( $file ) {
return self::canRotate() && $this->getRotation( $file ) != 0;
}
}
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