Current File : //www/varak.net/wiki.varak.net/includes/media/JpegHandler.php
<?php
/**
* Handler for JPEG 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
*/
/**
* JPEG specific handler.
* Inherits most stuff from BitmapHandler, just here to do the metadata handler differently.
*
* Metadata stuff common to Jpeg and built-in Tiff (not PagedTiffHandler) is
* in ExifBitmapHandler.
*
* @ingroup Media
*/
class JpegHandler extends ExifBitmapHandler {
const SRGB_EXIF_COLOR_SPACE = 'sRGB';
const SRGB_ICC_PROFILE_DESCRIPTION = 'sRGB IEC61966-2.1';
function normaliseParams( $image, &$params ) {
if ( !parent::normaliseParams( $image, $params ) ) {
return false;
}
if ( isset( $params['quality'] ) && !self::validateQuality( $params['quality'] ) ) {
return false;
}
return true;
}
public function validateParam( $name, $value ) {
if ( $name === 'quality' ) {
return self::validateQuality( $value );
} else {
return parent::validateParam( $name, $value );
}
}
/** Validate and normalize quality value to be between 1 and 100 (inclusive).
* @param int $value Quality value, will be converted to integer or 0 if invalid
* @return bool True if the value is valid
*/
private static function validateQuality( $value ) {
return $value === 'low';
}
public function makeParamString( $params ) {
// Prepend quality as "qValue-". This has to match parseParamString() below
$res = parent::makeParamString( $params );
if ( $res && isset( $params['quality'] ) ) {
$res = "q{$params['quality']}-$res";
}
return $res;
}
public function parseParamString( $str ) {
// $str contains "qlow-200px" or "200px" strings because thumb.php would strip the filename
// first - check if the string begins with "qlow-", and if so, treat it as quality.
// Pass the first portion, or the whole string if "qlow-" not found, to the parent
// The parsing must match the makeParamString() above
$res = false;
$m = false;
if ( preg_match( '/q([^-]+)-(.*)$/', $str, $m ) ) {
$v = $m[1];
if ( self::validateQuality( $v ) ) {
$res = parent::parseParamString( $m[2] );
if ( $res ) {
$res['quality'] = $v;
}
}
} else {
$res = parent::parseParamString( $str );
}
return $res;
}
function getScriptParams( $params ) {
$res = parent::getScriptParams( $params );
if ( isset( $params['quality'] ) ) {
$res['quality'] = $params['quality'];
}
return $res;
}
function getMetadata( $image, $filename ) {
try {
$meta = BitmapMetadataHandler::Jpeg( $filename );
if ( !is_array( $meta ) ) {
// This should never happen, but doesn't hurt to be paranoid.
throw new MWException( 'Metadata array is not an array' );
}
$meta['MEDIAWIKI_EXIF_VERSION'] = Exif::version();
return serialize( $meta );
} catch ( Exception $e ) {
// BitmapMetadataHandler throws an exception in certain exceptional
// cases like if file does not exist.
wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
/* This used to use 0 (ExifBitmapHandler::OLD_BROKEN_FILE) for the cases
* * No metadata in the file
* * Something is broken in the file.
* However, if the metadata support gets expanded then you can't tell if the 0 is from
* a broken file, or just no props found. A broken file is likely to stay broken, but
* a file which had no props could have props once the metadata support is improved.
* Thus switch to using -1 to denote only a broken file, and use an array with only
* MEDIAWIKI_EXIF_VERSION to denote no props.
*/
return ExifBitmapHandler::BROKEN_FILE;
}
}
/**
* @param File $file
* @param array $params Rotate parameters.
* 'rotation' clockwise rotation in degrees, allowed are multiples of 90
* @since 1.21
* @return bool|MediaTransformError
*/
public function rotate( $file, $params ) {
global $wgJpegTran;
$rotation = ( $params['rotation'] + $this->getRotation( $file ) ) % 360;
if ( $wgJpegTran && is_executable( $wgJpegTran ) ) {
$cmd = wfEscapeShellArg( $wgJpegTran ) .
" -rotate " . wfEscapeShellArg( $rotation ) .
" -outfile " . wfEscapeShellArg( $params['dstPath'] ) .
" " . wfEscapeShellArg( $params['srcPath'] );
wfDebug( __METHOD__ . ": running jpgtran: $cmd\n" );
$retval = 0;
$err = wfShellExecWithStderr( $cmd, $retval );
if ( $retval !== 0 ) {
$this->logErrorForExternalProcess( $retval, $err, $cmd );
return new MediaTransformError( 'thumbnail_error', 0, 0, $err );
}
return false;
} else {
return parent::rotate( $file, $params );
}
}
public function supportsBucketing() {
return true;
}
public function sanitizeParamsForBucketing( $params ) {
$params = parent::sanitizeParamsForBucketing( $params );
// Quality needs to be cleared for bucketing. Buckets need to be default quality
if ( isset( $params['quality'] ) ) {
unset( $params['quality'] );
}
return $params;
}
/**
* @inheritDoc
*/
protected function transformImageMagick( $image, $params ) {
global $wgUseTinyRGBForJPGThumbnails;
$ret = parent::transformImageMagick( $image, $params );
if ( $ret ) {
return $ret;
}
if ( $wgUseTinyRGBForJPGThumbnails ) {
// T100976 If the profile embedded in the JPG is sRGB, swap it for the smaller
// (and free) TinyRGB
/**
* We'll want to replace the color profile for JPGs:
* * in the sRGB color space, or with the sRGB profile
* (other profiles will be left untouched)
* * without color space or profile, in which case browsers
* should assume sRGB, but don't always do (e.g. on wide-gamut
* monitors (unless it's meant for low bandwith)
* @see https://phabricator.wikimedia.org/T134498
*/
$colorSpaces = [ self::SRGB_EXIF_COLOR_SPACE, '-' ];
$profiles = [ self::SRGB_ICC_PROFILE_DESCRIPTION ];
// we'll also add TinyRGB profile to images lacking a profile, but
// only if they're not low quality (which are meant to save bandwith
// and we don't want to increase the filesize by adding a profile)
if ( isset( $params['quality'] ) && $params['quality'] > 30 ) {
$profiles[] = '-';
}
$this->swapICCProfile(
$params['dstPath'],
$colorSpaces,
$profiles,
realpath( __DIR__ ) . '/tinyrgb.icc'
);
}
return false;
}
/**
* Swaps an embedded ICC profile for another, if found.
* Depends on exiftool, no-op if not installed.
* @param string $filepath File to be manipulated (will be overwritten)
* @param array $colorSpaces Only process files with this/these Color Space(s)
* @param array $oldProfileStrings Exact name(s) of color profile to look for
* (the one that will be replaced)
* @param string $profileFilepath ICC profile file to apply to the file
* @since 1.26
* @return bool
*/
public function swapICCProfile( $filepath, array $colorSpaces,
array $oldProfileStrings, $profileFilepath
) {
global $wgExiftool;
if ( !$wgExiftool || !is_executable( $wgExiftool ) ) {
return false;
}
$cmd = wfEscapeShellArg( $wgExiftool,
'-EXIF:ColorSpace',
'-ICC_Profile:ProfileDescription',
'-S',
'-T',
$filepath
);
$output = wfShellExecWithStderr( $cmd, $retval );
// Explode EXIF data into an array with [0 => Color Space, 1 => Device Model Desc]
$data = explode( "\t", trim( $output ) );
if ( $retval !== 0 ) {
return false;
}
// Make a regex out of the source data to match it to an array of color
// spaces in a case-insensitive way
$colorSpaceRegex = '/' . preg_quote( $data[0], '/' ) . '/i';
if ( empty( preg_grep( $colorSpaceRegex, $colorSpaces ) ) ) {
// We can't establish that this file matches the color space, don't process it
return false;
}
$profileRegex = '/' . preg_quote( $data[1], '/' ) . '/i';
if ( empty( preg_grep( $profileRegex, $oldProfileStrings ) ) ) {
// We can't establish that this file has the expected ICC profile, don't process it
return false;
}
$cmd = wfEscapeShellArg( $wgExiftool,
'-overwrite_original',
'-icc_profile<=' . $profileFilepath,
$filepath
);
$output = wfShellExecWithStderr( $cmd, $retval );
if ( $retval !== 0 ) {
$this->logErrorForExternalProcess( $retval, $output, $cmd );
return false;
}
return true;
}
}
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