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<?php
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/**
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* @brief Image Class - GD
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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\Image;
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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 - GD
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*/
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class _GD extends \IPS\Image
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{
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/**
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* @brief Image Resource
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*/
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public $image;
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/**
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* Constructor
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*
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* @param string $contents Contents
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* @return void
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* @throws \InvalidArgumentException
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*/
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public function __construct( $contents )
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{
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/* Create the resource */
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$this->image = @imagecreatefromstring( $contents );
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if ( $this->image === FALSE )
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{
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throw new \InvalidArgumentException;
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}
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/* Set width/height */
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$this->width = imagesx( $this->image );
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$this->height = imagesy( $this->image );
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/* Try to maintain any transparency */
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imagealphablending( $this->image, true );
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imagesavealpha( $this->image, true );
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}
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/**
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* Destructor
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*
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* @return void
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*/
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public function __destruct()
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{
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if( is_resource( $this->image ) )
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{
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imagedestroy( $this->image );
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}
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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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public function __toString()
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{
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ob_start();
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switch( $this->type )
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{
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case 'gif':
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if ( $this->isAnimatedGif )
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{
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return $this->contents;
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}
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imagegif( $this->image );
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break;
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case 'jpeg':
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$quality = \IPS\Settings::i()->image_jpg_quality ?: NULL;
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imagejpeg( $this->image, NULL, $quality );
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break;
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case 'png':
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$quality = \IPS\Settings::i()->image_png_quality_gd ?: NULL;
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imagepng( $this->image, NULL, $quality );
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break;
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}
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return ob_get_clean();
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}
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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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public function resize( $width, $height )
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{
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return $this->_manipulate( $width, $height, FALSE );
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}
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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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public function crop( $width, $height )
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{
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return $this->_manipulate( $width, $height, TRUE );
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}
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/**
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* Resize and/or crop image
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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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* @param bool $crop Crop image to provided dimensions
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* @return void
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*/
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public function _manipulate( $width, $height, $crop=FALSE )
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{
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if ( $this->isAnimatedGif )
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{
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return $this->image;
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}
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/* Create a new canvas */
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$newImage = imagecreatetruecolor( $width, $height );
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switch( $this->type )
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{
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case 'gif':
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imagealphablending( $newImage, FALSE );
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$transindex = imagecolortransparent( $this->image );
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if( $transindex >= 0 )
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{
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$transcol = @imagecolorsforindex( $this->image, $transindex );
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$transindex = imagecolorallocatealpha( $newImage, $transcol['red'], $transcol['green'], $transcol['blue'], 127 );
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imagefill( $newImage, 0, 0, $transindex );
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}
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break;
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case 'jpeg':
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imagealphablending( $newImage, TRUE );
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break;
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case 'png':
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imagealphablending( $newImage, FALSE );
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imagesavealpha( $newImage, TRUE );
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break;
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}
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/* Crop the image? */
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if( $crop === TRUE )
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{
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/* First, downsize the image */
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$ratio = ( $this->width / $this->height );
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if ( $width / $height > $ratio )
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{
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$nheight = $width / $ratio;
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$nwidth = $width;
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}
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else
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{
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$nwidth = $height * $ratio;
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$nheight = $height;
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}
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$this->resizeToMax( $nwidth, $nheight );
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/* Then we use imagecopy which will crop */
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imagecopy( $newImage, $this->image, 0, 0, 0, 0, $this->width, $this->height );
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}
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else
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{
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/* Copy the image resampled */
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imagecopyresampled( $newImage, $this->image, 0, 0, 0, 0, $width, $height, $this->width, $this->height );
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}
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/* Replace */
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imagedestroy( $this->image );
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$this->image = $newImage;
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/* Set width/height */
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$this->width = imagesx( $this->image );
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$this->height = imagesy( $this->image );
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}
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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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public function cropToPoints( $point1X, $point1Y, $point2X, $point2Y )
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{
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/* Create a new canvas */
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$newImage = imagecreatetruecolor( ( $point2X - $point1X > 0 ) ? $point2X - $point1X : 0, ( $point2Y - $point1Y > 0 ) ? $point2Y - $point1Y : 0 );
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switch( $this->type )
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{
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case 'gif':
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imagealphablending( $newImage, FALSE );
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$transindex = imagecolortransparent( $this->image );
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if( $transindex >= 0 )
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{
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$transcol = @imagecolorsforindex( $this->image, $transindex );
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$transindex = imagecolorallocatealpha( $newImage, $transcol['red'], $transcol['green'], $transcol['blue'], 127 );
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imagefill( $newImage, 0, 0, $transindex );
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}
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break;
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case 'jpeg':
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imagealphablending( $newImage, TRUE );
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break;
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case 'png':
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imagealphablending( $newImage, FALSE );
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imagesavealpha( $newImage, TRUE );
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break;
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}
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/* Then we use imagecopy which will crop */
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imagecopy( $newImage, $this->image, 0, 0, $point1X, $point1Y, $point2X - $point1X, $point2Y - $point1Y );
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/* Replace */
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imagedestroy( $this->image );
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$this->image = $newImage;
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/* Set width/height */
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$this->width = imagesx( $this->image );
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$this->height = imagesy( $this->image );
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}
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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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public function impose( $image, $x=0, $y=0 )
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{
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imagecopy( $this->image, $image->image, $x, $y, 0, 0, $image->width, $image->height );
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}
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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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public function rotate( $angle )
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{
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$this->image = imagerotate( $this->image, $angle, 0 );
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/* Set width/height */
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$this->width = imagesx( $this->image );
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$this->height = imagesy( $this->image );
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/* Try to maintain any transparency */
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imagealphablending( $this->image, true );
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imagesavealpha( $this->image, true );
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}
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/**
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* Get Image Orientation
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*
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* @return int|NULL
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*/
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public function getImageOrientation()
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{
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if ( static::exifSupported() )
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{
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$exif = $this->parseExif();
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if ( isset( $exif['IFD0.Orientation'] ) )
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{
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return $exif['IFD0.Orientation'];
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}
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}
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return NULL;
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}
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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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public function setImageOrientation( $orientation )
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{
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/* Note, GD does not require orientation to be set after rotation */
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}
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}
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