380 lines
8.2 KiB
PHP
380 lines
8.2 KiB
PHP
<?php
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/**
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* @brief Image Class
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* @author <a href='http://www.invisionpower.com'>Invision Power Services, Inc.</a>
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* @copyright (c) 2001 - SVN_YYYY Invision Power Services, Inc.
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* @license http://www.invisionpower.com/legal/standards/
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* @package IPS Social Suite
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* @since 19 Feb 2013
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* @version SVN_VERSION_NUMBER
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*/
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namespace IPS;
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/* To prevent PHP errors (extending class does not exist) revealing path */
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if ( !defined( '\IPS\SUITE_UNIQUE_KEY' ) )
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{
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header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
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exit;
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}
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/**
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* Image Class
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*/
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abstract class _Image
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{
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/**
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* @brief Image Extensions
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*/
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public static $imageExtensions = array( 'gif', 'jpeg', 'jpe', 'jpg', 'png' );
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/**
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* Determine if EXIF extraction is supported
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*
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* @return bool
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*/
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public static function exifSupported()
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{
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return function_exists( 'exif_read_data' );
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}
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/**
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* @brief Has the image been automatically rotated?
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*/
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public $hasBeenRotated = FALSE;
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/**
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* Create Object
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*
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* @param string $contents Contents
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* @return \IPS\Image
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* @throws \InvalidArgumentException
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*/
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public static function create( $contents )
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{
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/* Create object */
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if( \IPS\Settings::i()->image_suite == 'imagemagick' and class_exists( 'Imagick', FALSE ) )
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{
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$obj = new Image\Imagemagick( $contents );
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}
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else
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{
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$obj = new Image\Gd( $contents );
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}
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/* Work out the type */
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preg_match( '/\A(?:(\xff\xd8\xff)|(GIF8[79]a)|(\x89PNG\x0d\x0a)|(BM)|(\x49\x49(?:\x2a\x00|\x00\x4a))|(FORM.{4}ILBM))/', $contents, $matches );
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switch ( count( $matches ) )
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{
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case 2:
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$obj->type = 'jpeg';
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break;
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case 3:
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$obj->type = 'gif';
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if ( (boolean) preg_match( '#(\x00\x21\xF9\x04.{4}\x00\x2C.*){2,}#s', $contents ) )
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{
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$obj->isAnimatedGif = TRUE;
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$obj->contents = $contents;
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}
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break;
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case 4:
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$obj->type = 'png';
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break;
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default:
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throw new \InvalidArgumentException;
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}
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/* Set EXIF data immediately */
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if( static::exifSupported() )
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{
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$obj->setExifData( $contents );
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/* If the image is misoriented, attempt to automatically reorient */
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if( \IPS\Image::exifSupported() )
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{
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/* Differences in orientation between GD and ImageMagick can cause auto-reorient to not work properly */
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/* @see http://community.invisionpower.com/4bugtrack/rc1-imagemagick-and-vertical-photos-r2952 */
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$orientation = $obj->getImageOrientation();
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if ( !( $obj instanceof Image\Imagemagick ) )
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{
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switch ( $orientation )
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{
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case 3:
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$obj->rotate( 180 );
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$obj->hasBeenRotated = TRUE;
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break;
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case 6:
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$obj->rotate( -90 );
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$obj->hasBeenRotated = TRUE;
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break;
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case 8:
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$obj->rotate( 90 );
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$obj->hasBeenRotated = TRUE;
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break;
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}
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}
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else
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{
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switch( $orientation )
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{
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case 3:
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$obj->rotate( 180 );
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$obj->hasBeenRotated = TRUE;
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break;
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case 6:
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$obj->rotate( 90 );
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$obj->hasBeenRotated = TRUE;
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break;
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case 8:
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$obj->rotate( -90 );
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$obj->hasBeenRotated = TRUE;
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break;
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}
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}
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/* ImageMagick requires orientation be reset when rotated */
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$obj->setImageOrientation( 1 );
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}
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}
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/* Return */
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return $obj;
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}
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/**
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* @brief Type ('png', 'jpeg' or 'gif')
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*/
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protected $type;
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/**
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* @brief Width
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*/
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public $width;
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/**
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* @brief Height
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*/
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public $height;
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/**
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* @brief Is this an animated gif?
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*/
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protected $isAnimatedGif = FALSE;
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/**
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* @brief Contents of the image file when animated gif
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*/
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public $contents = NULL;
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/**
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* @brief EXIF data - has to be pulled and stored before GD manipulates image
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*/
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protected $exif = array();
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/**
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* Resize to maximum
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*
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* @param int|NULL $maxWidth Max Width (in pixels) or NULL
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* @param int|NULL $maxHeight Max Height (in pixels) or NULL
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* @param bool $retainRatio If TRUE, the image will keep it's current width/height ratio rather than being squashed
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* @return bool
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*/
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public function resizeToMax( $maxWidth=NULL, $maxHeight=NULL, $retainRatio=TRUE )
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{
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/* If the image is smaller than max we can skip */
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if( ( $maxWidth == NULL or $this->width < $maxWidth ) and ( $maxHeight == NULL or $this->height < $maxHeight ) )
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{
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return TRUE;
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}
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/* Work out the maximum width/height */
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$width = ( $maxWidth !== NULL and $this->width > $maxWidth ) ? $maxWidth : $this->width;
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$height = ( $maxHeight !== NULL and $this->height > $maxHeight ) ? $maxHeight : $this->height;
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if ( $width != $this->width or $height != $this->height )
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{
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/* Adjust the width/height as necessary if we want to keep the ratio */
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if ( $retainRatio === TRUE )
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{
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if ( ( $this->height - $height ) <= ( $this->width - $width ) )
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{
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$ratio = $this->height / $this->width;
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$height = $width * $ratio;
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}
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else
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{
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$ratio = $this->width / $this->height;
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$width = $height * $ratio;
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}
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}
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/* And resize */
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return $this->resize( $width, $height );
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}
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return TRUE;
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}
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/**
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* Add Watermark
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*
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* @param \IPS\Image $watermark The watermark
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* @return void
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*/
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public function watermark( \IPS\Image $watermark )
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{
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/* If it's too big, resize the watermark */
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$watermark->resizeToMax( $this->width, $this->height );
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/* Impose */
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$this->impose( $watermark, $this->width - $watermark->width, $this->height - $watermark->height );
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}
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/**
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* Parse file object to extract EXIF data
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*
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* @return array
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* @throws \LogicException
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*/
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public function parseExif()
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{
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if( !static::exifSupported() )
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{
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throw new \LogicException( 'NO_EXIF' );
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}
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if( !in_array( $this->type, array( 'jpeg', 'jpg', 'jpe' ) ) )
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{
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return array();
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}
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$result = array();
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/* Read the data and store in an array */
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if( $values = $this->getExifData() )
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{
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foreach( $values as $section => $data )
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{
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foreach( $data as $name => $value )
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{
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$result[ $section . '.' . $name ] = $value;
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}
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}
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}
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/* Return the EXIF data */
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return $result;
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}
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/**
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* Get EXIF data, if possible
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*
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* @return array
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*/
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public function getExifData()
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{
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return $this->exif;
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}
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/**
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* Get EXIF data, if possible
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*
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* @param string $image Image contents
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* @return void
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*/
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public function setExifData( $contents )
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{
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if( !in_array( $this->type, array( 'jpeg', 'jpg', 'jpe' ) ) )
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{
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return;
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}
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/* Exif requires a file on disk, so write it temporarily */
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$temporary = tempnam( \IPS\TEMP_DIRECTORY, 'exif' );
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\file_put_contents( $temporary, $contents );
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$result = @exif_read_data( $temporary, NULL, TRUE );
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/* Remove the temporary file */
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if( @is_file( $temporary ) )
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{
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@unlink( $temporary );
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}
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$this->exif = $result;
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}
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/**
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* Get Contents
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*
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* @return string
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*/
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abstract public function __toString();
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/**
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* Resize
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*
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* @param int $width Width (in pixels)
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* @param int $height Height (in pixels)
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* @return void
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*/
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abstract public function resize( $width, $height );
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/**
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* Crop to a given width and height (will attempt to downsize first)
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*
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* @param int $width Width (in pixels)
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* @param int $height Height (in pixels)
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* @return void
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*/
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abstract public function crop( $width, $height );
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/**
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* Crop at specific points
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*
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* @param int $point1X x-point for top-left corner
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* @param int $point1Y y-point for top-left corner
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* @param int $point2X x-point for bottom-right corner
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* @param int $point2Y y-point for bottom-right corner
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* @return void
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*/
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abstract public function cropToPoints( $point1X, $point1Y, $point2X, $point2Y );
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/**
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* Impose image
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*
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* @param \IPS\Image $image Image to impose
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* @param int $x Location to impose to, x axis
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* @param int $y Location to impose to, y axis
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* @return void
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*/
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abstract public function impose( $image, $x=0, $y=0 );
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/**
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* Rotate image
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*
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* @param int $angle Angle of rotation
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* @return void
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*/
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abstract public function rotate( $angle );
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/**
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* Get Image Orientation
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*
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* @return int|NULL
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*/
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abstract public function getImageOrientation();
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/**
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* Set Image Orientation
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*
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* @param int $orientation The orientation
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* @return void
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*/
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abstract public function setImageOrientation( $orientation );
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} |