<?php
/**
* @brief Image Class - GD
* @author <a href='https://www.invisioncommunity.com'>Invision Power Services, Inc.</a>
* @copyright (c) Invision Power Services, Inc.
* @license https://www.invisioncommunity.com/legal/standards/
* @package Invision Community
* @since 19 Feb 2013
*/
namespace IPS\Image;
/* To prevent PHP errors (extending class does not exist) revealing path */
if ( !defined( '\IPS\SUITE_UNIQUE_KEY' ) )
{
header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
exit;
}
/**
* Image Class - GD
*/
class _Gd extends \IPS\Image
{
/**
* @brief Image Resource
*/
public $image;
/**
* Constructor
*
* @param string|NULL $contents Contents
* @param bool $noImage We are creating a new instance of the object internally and are not passing an image string
* @return void
* @throws \InvalidArgumentException
*/
public function __construct( $contents, $noImage=FALSE )
{
/* If we are just creating an instance of the object without passing image contents as a string, return now */
if( $noImage === TRUE )
{
return;
}
/* Create the resource */
$this->image = @imagecreatefromstring( $contents );
if ( $this->image === FALSE )
{
if ( $error = error_get_last() )
{
throw new \InvalidArgumentException( $error['message'], $error['type'] );
}
throw new \InvalidArgumentException;
}
/* Set width/height */
$this->width = imagesx( $this->image );
$this->height = imagesy( $this->image );
/* Try to maintain any transparency */
$this->setAlpha();
}
/**
* Create a new blank canvas image
*
* @param int $width Width
* @param int $height Height
* @param array $rgb Color to use for bg
* @return \IPS\Image
*/
public static function newImageCanvas( $width, $height, $rgb )
{
$obj = new static( NULL, TRUE );
$obj->type = 'png';
$obj->width = $width;
$obj->height = $height;
$obj->image = imagecreatetruecolor( $width, $height );
$bgColor = imagecolorallocatealpha( $obj->image, $rgb[0], $rgb[1], $rgb[2], 1 );
imagefill( $obj->image, 0, 0, $bgColor );
return $obj;
}
/**
* Write text on our image
*
* @param string $text Text
* @param string $font Path to font to use
* @param int $size Size of text
* @return void
* @note Some latin characters have inherent left padding, so when we want to center a letter visually we need to account for this
*/
public function write( $text, $font, $size)
{
$fontColor = imagecolorallocate( $this->image, 255, 255, 255 );
$box = imagettfbbox( $size, 0, $font, $text );
$x = intval( ( imagesx( $this->image ) - abs( max( $box[2], $box[4] ) ) ) / 2 ) - ( ( $box[0] > 0 ) ? ( $box[0] / 2.5 ) : 0 );
$y = intval( ( imagesy( $this->image ) + ( abs( $box[5] ) - abs( $box[1] ) ) ) / 2 );
imagettftext( $this->image, $size, 0, $x, $y, $fontColor, $font, $text );
}
/**
* Destructor
*
* @return void
*/
public function __destruct()
{
if( is_resource( $this->image ) )
{
imagedestroy( $this->image );
}
}
/**
* Get Contents
*
* @return string
*/
public function __toString()
{
$this->setAlpha();
ob_start();
switch( $this->type )
{
case 'gif':
if ( $this->isAnimatedGif )
{
return (string) $this->contents;
}
imagegif( $this->image );
break;
case 'jpeg':
$quality = \IPS\Settings::i()->image_jpg_quality ?: 85;
imagejpeg( $this->image, NULL, $quality );
break;
case 'png':
$quality = \IPS\Settings::i()->image_png_quality_gd ?: NULL;
imagepng( $this->image, NULL, $quality );
break;
}
return ob_get_clean();
}
/**
* Resets alpha transparency preservation
*
* @return void
*/
protected function setAlpha()
{
/* Turn off alpha blending and turn on saving of alpha channel info (this requires turning off alpha blending) */
imagealphablending( $this->image, false );
imagesavealpha( $this->image, true );
}
/**
* Resize
*
* @param int $width Width (in pixels)
* @param int $height Height (in pixels)
* @return void
*/
public function resize( $width, $height )
{
return $this->_manipulate( $width, $height, FALSE );
}
/**
* Crop to a given width and height (will attempt to downsize first)
*
* @param int $width Width (in pixels)
* @param int $height Height (in pixels)
* @return void
*/
public function crop( $width, $height )
{
return $this->_manipulate( $width, $height, TRUE );
}
/**
* Resize and/or crop image
*
* @param int $width Width (in pixels)
* @param int $height Height (in pixels)
* @param bool $crop Crop image to provided dimensions
* @return void
*/
public function _manipulate( $width, $height, $crop=FALSE )
{
if ( $this->isAnimatedGif )
{
return $this->image;
}
/* Create a new canvas */
$width = ceil( $width );
$height = ceil( $height );
$newImage = imagecreatetruecolor( $width, $height );
switch( $this->type )
{
case 'gif':
imagealphablending( $newImage, FALSE );
$transindex = imagecolortransparent( $this->image );
if( $transindex >= 0 )
{
$transcol = @imagecolorsforindex( $this->image, $transindex );
$transindex = imagecolorallocatealpha( $newImage, $transcol['red'], $transcol['green'], $transcol['blue'], 127 );
imagefill( $newImage, 0, 0, $transindex );
}
break;
case 'png':
case 'jpg':
/* We need to fill the background as transparent. If we copy a watermark image here (resizing it down for instance) and it has
transparency, then the background color will show through, so it needs to be transparent too. */
$transparent = imagecolorallocatealpha( $newImage, 0, 0, 0, 127 );
imagefill( $newImage, 0, 0, $transparent );
break;
}
/* Crop the image? */
if( $crop === TRUE )
{
/* First, downsize the image */
$ratio = ( $this->width / $this->height );
if ( $width / $height > $ratio )
{
$nheight = $width / $ratio;
$nwidth = $width;
}
else
{
$nwidth = $height * $ratio;
$nheight = $height;
}
$this->resizeToMax( $nwidth, $nheight );
/* Then we use imagecopy which will crop */
imagecopy( $newImage, $this->image, 0, 0, 0, 0, $this->width, $this->height );
}
else
{
/* Copy the image resampled */
imagecopyresampled( $newImage, $this->image, 0, 0, 0, 0, $width, $height, $this->width, $this->height );
}
/* Replace */
imagedestroy( $this->image );
$this->image = $newImage;
/* Set width/height */
$this->width = imagesx( $this->image );
$this->height = imagesy( $this->image );
$this->setAlpha();
}
/**
* Crop at specific points
*
* @param int $point1X x-point for top-left corner
* @param int $point1Y y-point for top-left corner
* @param int $point2X x-point for bottom-right corner
* @param int $point2Y y-point for bottom-right corner
* @return void
*/
public function cropToPoints( $point1X, $point1Y, $point2X, $point2Y )
{
/* Create a new canvas */
$newImage = imagecreatetruecolor( ( $point2X - $point1X > 0 ) ? $point2X - $point1X : 0, ( $point2Y - $point1Y > 0 ) ? $point2Y - $point1Y : 0 );
switch( $this->type )
{
case 'gif':
imagealphablending( $newImage, FALSE );
$transindex = imagecolortransparent( $this->image );
if( $transindex >= 0 )
{
$transcol = @imagecolorsforindex( $this->image, $transindex );
$transindex = imagecolorallocatealpha( $newImage, $transcol['red'], $transcol['green'], $transcol['blue'], 127 );
imagefill( $newImage, 0, 0, $transindex );
}
break;
case 'png':
case 'jpg':
/* We need to fill the background as transparent. If we copy a watermark image here (resizing it down for instance) and it has
transparency, then the background color will show through, so it needs to be transparent too. */
$transparent = imagecolorallocatealpha( $newImage, 0, 0, 0, 127 );
imagefill( $newImage, 0, 0, $transparent );
break;
}
/* Then we use imagecopy which will crop */
imagecopy( $newImage, $this->image, 0, 0, $point1X, $point1Y, $point2X - $point1X, $point2Y - $point1Y );
/* Replace */
imagedestroy( $this->image );
$this->image = $newImage;
/* Set width/height */
$this->width = imagesx( $this->image );
$this->height = imagesy( $this->image );
$this->setAlpha();
}
/**
* Impose image
*
* @param \IPS\Image $image Image to impose
* @param int $x Location to impose to, x axis
* @param int y Location to impose to, y axis
* @return void
*/
public function impose( $image, $x=0, $y=0 )
{
/* Turn on alpha blending for both images */
imagealphablending( $this->image, true );
imagealphablending( $image->image, true );
/* Copy the image over - typically a watermark */
imagecopy( $this->image, $image->image, $x, $y, 0, 0, $image->width, $image->height );
}
/**
* Rotate image
*
* @param int $angle Angle of rotation
* @return void
*/
public function rotate( $angle )
{
$this->image = imagerotate( $this->image, $angle, 0 );
/* Set width/height */
$this->width = imagesx( $this->image );
$this->height = imagesy( $this->image );
}
/**
* Get Image Orientation
*
* @return int|NULL
*/
public function getImageOrientation()
{
if ( static::exifSupported() )
{
$exif = $this->parseExif();
if ( isset( $exif['IFD0.Orientation'] ) )
{
return $exif['IFD0.Orientation'];
}
}
return NULL;
}
/**
* Set Image Orientation
*
* @param int $orientation The orientation
* @return void
*/
public function setImageOrientation( $orientation )
{
/* Note, GD does not require orientation to be set after rotation */
}
/**
* Can we write text reliably on an image?
*
* @return bool
*/
public static function canWriteText()
{
return (bool) function_exists( 'imagettfbbox' );
}
}