ImageHandler.php

Go to the documentation of this file.

<?php
abstract class ImageHandler extends MediaHandler {
    function canRender( $file ) {
        return ( $file->getWidth() && $file->getHeight() );
    }

    function getParamMap() {
        return array( 'img_width' => 'width' );
    }

    function validateParam( $name, $value ) {
        if ( in_array( $name, array( 'width', 'height' ) ) ) {
            if ( $value <= 0 ) {
                return false;
            } else {
                return true;
            }
        } else {
            return false;
        }
    }

    function makeParamString( $params ) {
        if ( isset( $params['physicalWidth'] ) ) {
            $width = $params['physicalWidth'];
        } elseif ( isset( $params['width'] ) ) {
            $width = $params['width'];
        } else {
            throw new MWException( 'No width specified to ' . __METHOD__ );
        }

        # Removed for ProofreadPage
        #$width = intval( $width );
        return "{$width}px";
    }

    function parseParamString( $str ) {
        $m = false;
        if ( preg_match( '/^(\d+)px$/', $str, $m ) ) {
            return array( 'width' => $m[1] );
        } else {
            return false;
        }
    }

    function getScriptParams( $params ) {
        return array( 'width' => $params['width'] );
    }

    function normaliseParams( $image, &$params ) {
        $mimeType = $image->getMimeType();

        if ( !isset( $params['width'] ) ) {
            return false;
        }

        if ( !isset( $params['page'] ) ) {
            $params['page'] = 1;
        } else {
            $params['page'] = intval( $params['page'] );
            if ( $params['page'] > $image->pageCount() ) {
                $params['page'] = $image->pageCount();
            }

            if ( $params['page'] < 1 ) {
                $params['page'] = 1;
            }
        }

        $srcWidth = $image->getWidth( $params['page'] );
        $srcHeight = $image->getHeight( $params['page'] );

        if ( isset( $params['height'] ) && $params['height'] != -1 ) {
            # Height & width were both set
            if ( $params['width'] * $srcHeight > $params['height'] * $srcWidth ) {
                # Height is the relative smaller dimension, so scale width accordingly
                $params['width'] = self::fitBoxWidth( $srcWidth, $srcHeight, $params['height'] );

                if ( $params['width'] == 0 ) {
                    # Very small image, so we need to rely on client side scaling :(
                    $params['width'] = 1;
                }

                $params['physicalWidth'] = $params['width'];
            } else {
                # Height was crap, unset it so that it will be calculated later
                unset( $params['height'] );
            }
        }

        if ( !isset( $params['physicalWidth'] ) ) {
            # Passed all validations, so set the physicalWidth
            $params['physicalWidth'] = $params['width'];
        }

        # Because thumbs are only referred to by width, the height always needs
        # to be scaled by the width to keep the thumbnail sizes consistent,
        # even if it was set inside the if block above
        $params['physicalHeight'] = File::scaleHeight( $srcWidth, $srcHeight,
            $params['physicalWidth'] );

        # Set the height if it was not validated in the if block higher up
        if ( !isset( $params['height'] ) || $params['height'] == -1 ) {
            $params['height'] = $params['physicalHeight'];
        }

        if ( !$this->validateThumbParams( $params['physicalWidth'],
            $params['physicalHeight'], $srcWidth, $srcHeight, $mimeType )
        ) {
            return false;
        }

        return true;
    }

    function validateThumbParams( &$width, &$height, $srcWidth, $srcHeight, $mimeType ) {
        $width = intval( $width );

        # Sanity check $width
        if ( $width <= 0 ) {
            wfDebug( __METHOD__ . ": Invalid destination width: $width\n" );

            return false;
        }
        if ( $srcWidth <= 0 ) {
            wfDebug( __METHOD__ . ": Invalid source width: $srcWidth\n" );

            return false;
        }

        $height = File::scaleHeight( $srcWidth, $srcHeight, $width );
        if ( $height == 0 ) {
            # Force height to be at least 1 pixel
            $height = 1;
        }

        return true;
    }

    function getScriptedTransform( $image, $script, $params ) {
        if ( !$this->normaliseParams( $image, $params ) ) {
            return false;
        }
        $url = wfAppendQuery( $script, $this->getScriptParams( $params ) );

        if ( $image->mustRender() || $params['width'] < $image->getWidth() ) {
            return new ThumbnailImage( $image, $url, false, $params );
        }
    }

    function getImageSize( $image, $path ) {
        wfSuppressWarnings();
        $gis = getimagesize( $path );
        wfRestoreWarnings();

        return $gis;
    }

    function getImageArea( $image ) {
        return $image->getWidth() * $image->getHeight();
    }

    function getShortDesc( $file ) {
        global $wgLang;
        $nbytes = htmlspecialchars( $wgLang->formatSize( $file->getSize() ) );
        $widthheight = wfMessage( 'widthheight' )
            ->numParams( $file->getWidth(), $file->getHeight() )->escaped();

        return "$widthheight ($nbytes)";
    }

    function getLongDesc( $file ) {
        global $wgLang;
        $pages = $file->pageCount();
        $size = htmlspecialchars( $wgLang->formatSize( $file->getSize() ) );
        if ( $pages === false || $pages <= 1 ) {
            $msg = wfMessage( 'file-info-size' )->numParams( $file->getWidth(),
                $file->getHeight() )->params( $size,
                    $file->getMimeType() )->parse();
        } else {
            $msg = wfMessage( 'file-info-size-pages' )->numParams( $file->getWidth(),
                $file->getHeight() )->params( $size,
                    $file->getMimeType() )->numParams( $pages )->parse();
        }

        return $msg;
    }

    function getDimensionsString( $file ) {
        $pages = $file->pageCount();
        if ( $pages > 1 ) {
            return wfMessage( 'widthheightpage' )
                ->numParams( $file->getWidth(), $file->getHeight(), $pages )->text();
        } else {
            return wfMessage( 'widthheight' )
                ->numParams( $file->getWidth(), $file->getHeight() )->text();
        }
    }

    public function sanitizeParamsForBucketing( $params ) {
        $params = parent::sanitizeParamsForBucketing( $params );

        // We unset the height parameters in order to let normaliseParams recalculate them
        // Otherwise there might be a height discrepancy
        if ( isset( $params['height'] ) ) {
            unset( $params['height'] );
        }

        if ( isset( $params['physicalHeight'] ) ) {
            unset( $params['physicalHeight'] );
        }

        return $params;
    }
}