<?php namespace CodeIgniter\Images\Handlers;
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014-2018 British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author CodeIgniter Dev Team
* @copyright 2014-2018 British Columbia Institute of Technology (https://bcit.ca/)
* @license https://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 3.0.0
* @filesource
*/
use CodeIgniter\Images\Exceptions\ImageException;
use CodeIgniter\Images\Image;
use CodeIgniter\Images\ImageHandlerInterface;
abstract class BaseHandler implements ImageHandlerInterface
{
/**
* @var \Config\Images
*/
protected $config;
/**
* The image/file instance
* d
*
* @var \CodeIgniter\Images\Image
*/
protected $image = null;
protected $width = 0;
protected $height = 0;
protected $filePermissions = 0644;
protected $xAxis = 0;
protected $yAxis = 0;
protected $masterDim = 'auto';
/**
* Default options for text watermarking.
*
* @var array
*/
protected $textDefaults = [
'fontPath' => null,
'fontSize' => 16,
'color' => 'ffffff',
'opacity' => 1.0,
'vAlign' => 'bottom',
'hAlign' => 'center',
'vOffset' => 0,
'hOffset' => 0,
'padding' => 0,
'withShadow' => false,
'shadowColor' => '000000',
'shadowOffset' => 3,
];
/**
* Temporary image used by the different engines.
*
* @var resource
*/
protected $resource;
//--------------------------------------------------------------------
public function __construct($config = null)
{
$this->config = $config;
}
//--------------------------------------------------------------------
/**
* Sets another image for this handler to work on.
* Keeps us from needing to continually instantiate the handler.
*
* @param string $path
*
* @return $this
*/
public function withFile(string $path)
{
// Clear out the old resource so that
// it doesn't try to use a previous image
$this->resource = null;
$this->image = new Image($path, true);
$this->image->getProperties(false);
$this->width = $this->image->origWidth;
$this->height = $this->image->origHeight;
return $this;
}
//--------------------------------------------------------------------
/**
* Make the image resource object if needed
*/
protected function ensureResource()
{
if ($this->resource === null)
{
$path = $this->image->getPathname();
// if valid image type, make corresponding image resource
switch ($this->image->imageType)
{
case IMAGETYPE_GIF:
$this->resource = imagecreatefromgif($path);
break;
case IMAGETYPE_JPEG:
$this->resource = imagecreatefromjpeg($path);
break;
case IMAGETYPE_PNG:
$this->resource = imagecreatefrompng($path);
break;
}
}
}
//--------------------------------------------------------------------
/**
* Returns the image instance.
*
* @return \CodeIgniter\Images\Image
*/
public function getFile()
{
return $this->image;
}
//--------------------------------------------------------------------
/**
* Returns the temporary image used during the image processing.
* Good for extending the system or doing things this library
* is not intended to do.
*
* @return resource
*/
public function getResource()
{
$this->ensureResource();
return $this->resource;
}
//--------------------------------------------------------------------
/**
* Resize the image
*
* @param integer $width
* @param integer $height
* @param boolean $maintainRatio If true, will get the closest match possible while keeping aspect ratio true.
* @param string $masterDim
*
* @return BaseHandler
*/
public function resize(int $width, int $height, bool $maintainRatio = false, string $masterDim = 'auto')
{
// If the target width/height match the source, then we have nothing to do here.
if ($this->image->origWidth === $width && $this->image->origHeight === $height)
{
return $this;
}
$this->width = $width;
$this->height = $height;
if ($maintainRatio)
{
$this->masterDim = $masterDim;
$this->reproportion();
}
return $this->_resize($maintainRatio);
}
//--------------------------------------------------------------------
/**
* Crops the image to the desired height and width. If one of the height/width values
* is not provided, that value will be set the appropriate value based on offsets and
* image dimensions.
*
* @param integer|null $width
* @param integer|null $height
* @param integer|null $x X-axis coord to start cropping from the left of image
* @param integer|null $y Y-axis coord to start cropping from the top of image
* @param boolean $maintainRatio
* @param string $masterDim
*
* @return mixed
*/
public function crop(int $width = null, int $height = null, int $x = null, int $y = null, bool $maintainRatio = false, string $masterDim = 'auto')
{
$this->width = $width;
$this->height = $height;
$this->xAxis = $x;
$this->yAxis = $y;
if ($maintainRatio)
{
$this->masterDim = $masterDim;
$this->reproportion();
}
$result = $this->_crop();
$this->xAxis = null;
$this->yAxis = null;
return $result;
}
//--------------------------------------------------------------------
/**
* Rotates the image on the current canvas.
*
* @param float $angle
*
* @return mixed
*/
public function rotate(float $angle)
{
// Allowed rotation values
$degs = [
90,
180,
270,
];
if ($angle === '' || ! in_array($angle, $degs))
{
throw ImageException::forMissingAngle();
}
// cast angle as an int, for our use
$angle = (int) $angle;
// Reassign the width and height
if ($angle === 90 || $angle === 270)
{
$temp = $this->height;
$this->width = $this->height;
$this->height = $temp;
}
// Call the Handler-specific version.
$this->_rotate($angle);
return $this;
}
//--------------------------------------------------------------------
/**
* Flattens transparencies, default white background
*
* @param integer $red
* @param integer $green
* @param integer $blue
*
* @return mixed
*/
public function flatten(int $red = 255, int $green = 255, int $blue = 255)
{
$this->width = $this->image->origWidth;
$this->height = $this->image->origHeight;
return $this->_flatten();
}
//--------------------------------------------------------------------
/**
* Handler-specific method to flattening an image's transparencies.
*
* @param integer $red
* @param integer $green
* @param integer $blue
*
* @return mixed
* @internal param int $angle
*/
protected abstract function _flatten(int $red = 255, int $green = 255, int $blue = 255);
//--------------------------------------------------------------------
/**
* Handler-specific method to handle rotating an image in 90 degree increments.
*
* @param integer $angle
*
* @return mixed
*/
protected abstract function _rotate(int $angle);
//--------------------------------------------------------------------
/**
* Flips an image either horizontally or vertically.
*
* @param string $dir Either 'vertical' or 'horizontal'
*
* @return $this
*/
public function flip(string $dir = 'vertical')
{
$dir = strtolower($dir);
if ($dir !== 'vertical' && $dir !== 'horizontal')
{
throw ImageException::forInvalidDirection($dir);
}
return $this->_flip($dir);
}
//--------------------------------------------------------------------
/**
* Handler-specific method to handle flipping an image along its
* horizontal or vertical axis.
*
* @param string $direction
*
* @return mixed
*/
protected abstract function _flip(string $direction);
//--------------------------------------------------------------------
/**
* Overlays a string of text over the image.
*
* Valid options:
*
* - color Text Color (hex number)
* - shadowColor Color of the shadow (hex number)
* - hAlign Horizontal alignment: left, center, right
* - vAlign Vertical alignment: top, middle, bottom
* - hOffset
* - vOffset
* - fontPath
* - fontSize
* - shadowOffset
*
* @param string $text
* @param array $options
*
* @return $this
*/
public function text(string $text, array $options = [])
{
$options = array_merge($this->textDefaults, $options);
$options['color'] = trim($options['color'], '# ');
$options['shadowColor'] = trim($options['shadowColor'], '# ');
$this->_text($text, $options);
return $this;
}
//--------------------------------------------------------------------
/**
* Handler-specific method for overlaying text on an image.
*
* @param string $text
* @param array $options
*/
protected abstract function _text(string $text, array $options = []);
//--------------------------------------------------------------------
/**
* Reads the EXIF information from the image and modifies the orientation
* so that displays correctly in the browser. This is especially an issue
* with images taken by smartphones who always store the image up-right,
* but set the orientation flag to display it correctly.
*
* @param boolean $silent If true, will ignore exceptions when PHP doesn't support EXIF.
*
* @return $this
*/
public function reorient(bool $silent = false)
{
$orientation = $this->getEXIF('Orientation', $silent);
switch ($orientation)
{
case 2:
return $this->flip('horizontal');
break;
case 3:
return $this->rotate(180);
break;
case 4:
return $this->rotate(180)
->flip('horizontal');
break;
case 5:
return $this->rotate(270)
->flip('horizontal');
break;
case 6:
return $this->rotate(270);
break;
case 7:
return $this->rotate(90)
->flip('horizontal');
break;
case 8:
return $this->rotate(90);
break;
default:
return $this;
}
}
//--------------------------------------------------------------------
/**
* Retrieve the EXIF information from the image, if possible. Returns
* an array of the information, or null if nothing can be found.
*
* @param string|null $key If specified, will only return this piece of EXIF data.
*
* @param boolean $silent If true, will not throw our own exceptions.
*
* @return mixed
*/
public function getEXIF(string $key = null, bool $silent = false)
{
if (! function_exists('exif_read_data'))
{
if ($silent)
{
return null;
}
}
$exif = exif_read_data($this->image->getPathname());
if (! is_null($key) && is_array($exif))
{
$exif = array_key_exists($key, $exif) ? $exif[$key] : false;
}
return $exif;
}
//--------------------------------------------------------------------
/**
* Combine cropping and resizing into a single command.
*
* Supported positions:
* - top-left
* - top
* - top-right
* - left
* - center
* - right
* - bottom-left
* - bottom
* - bottom-right
*
* @param integer $width
* @param integer $height
* @param string $position
*
* @return boolean
*/
public function fit(int $width, int $height = null, string $position = 'center')
{
$origWidth = $this->image->origWidth;
$origHeight = $this->image->origHeight;
list($cropWidth, $cropHeight) = $this->calcAspectRatio($width, $height, $origWidth, $origHeight);
if (is_null($height))
{
$height = ceil(($width / $cropWidth) * $cropHeight);
}
list($x, $y) = $this->calcCropCoords($width, $height, $origWidth, $origHeight, $position);
return $this->crop($cropWidth, $cropHeight, $x, $y)
->resize($width, $height);
}
//--------------------------------------------------------------------
/**
*
*
* @param $width
* @param null $height
* @param $origWidth
* @param $origHeight
*
* @return array
*/
protected function calcAspectRatio($width, $height = null, $origWidth, $origHeight): array
{
// If $height is null, then we have it easy.
// Calc based on full image size and be done.
if (is_null($height))
{
$height = ($width / $origWidth) * $origHeight;
return [
$width,
(int) $height,
];
}
$xRatio = $width / $origWidth;
$yRatio = $height / $origHeight;
if ($xRatio > $yRatio)
{
return [
(int) ($origWidth * $yRatio),
(int) ($origHeight * $yRatio),
];
}
return [
(int) ($origWidth * $xRatio),
(int) ($origHeight * $xRatio),
];
}
//--------------------------------------------------------------------
/**
* Based on the position, will determine the correct x/y coords to
* crop the desired portion from the image.
*
* @param $width
* @param $height
* @param $origWidth
* @param $origHeight
* @param $position
*
* @return array
*/
protected function calcCropCoords($width, $height, $origWidth, $origHeight, $position): array
{
$position = strtolower($position);
$x = $y = 0;
switch ($position)
{
case 'top-left':
$x = 0;
$y = 0;
break;
case 'top':
$x = floor(($origWidth - $width) / 2);
$y = 0;
break;
case 'top-right':
$x = $origWidth - $width;
$y = 0;
break;
case 'left':
$x = 0;
$y = floor(($origHeight - $height) / 2);
break;
case 'center':
$x = floor(($origWidth - $width) / 2);
$y = floor(($origHeight - $height) / 2);
break;
case 'right':
$x = ($origWidth - $width);
$y = floor(($origHeight - $height) / 2);
break;
case 'bottom-left':
$x = 0;
$y = $origHeight - $height;
break;
case 'bottom':
$x = floor(($origWidth - $width) / 2);
$y = $origHeight - $height;
break;
case 'bottom-right':
$x = ($origWidth - $width);
$y = $origHeight - $height;
break;
}
return [
$x,
$y,
];
}
//--------------------------------------------------------------------
/**
* Get the version of the image library in use.
*
* @return string
*/
public abstract function getVersion();
//--------------------------------------------------------------------
/**
* Saves any changes that have been made to file.
*
* Example:
* $image->resize(100, 200, true)
* ->save($target);
*
* @param string $target
* @param integer $quality
*
* @return mixed
*/
public abstract function save(string $target = null, int $quality = 90);
//--------------------------------------------------------------------
/**
* Does the driver-specific processing of the image.
*
* @param string $action
*
* @return mixed
*/
protected abstract function process(string $action);
//--------------------------------------------------------------------
/**
* Provide access to the Image class' methods if they don't exist
* on the handler itself.
*
* @param string $name
* @param array $args
*/
public function __call(string $name, array $args = [])
{
if (method_exists($this->image, $name))
{
return $this->image->$name(...$args);
}
}
//--------------------------------------------------------------------
/**
* Re-proportion Image Width/Height
*
* When creating thumbs, the desired width/height
* can end up warping the image due to an incorrect
* ratio between the full-sized image and the thumb.
*
* This function lets us re-proportion the width/height
* if users choose to maintain the aspect ratio when resizing.
*
* @return void
*/
protected function reproportion()
{
if (($this->width === 0 && $this->height === 0) ||
$this->image->origWidth === 0 ||
$this->image->origHeight === 0 ||
( ! ctype_digit((string) $this->width) && ! ctype_digit((string) $this->height)) ||
! ctype_digit((string) $this->image->origWidth) ||
! ctype_digit((string) $this->image->origHeight)
)
{
return;
}
// Sanitize
$this->width = (int) $this->width;
$this->height = (int) $this->height;
if ($this->masterDim !== 'width' && $this->masterDim !== 'height')
{
if ($this->width > 0 && $this->height > 0)
{
$this->masterDim = ((($this->image->origHeight / $this->image->origWidth) - ($this->height / $this->width)) < 0) ? 'width' : 'height';
}
else
{
$this->masterDim = ($this->height === 0) ? 'width' : 'height';
}
}
elseif (($this->masterDim === 'width' && $this->width === 0) || ($this->masterDim === 'height' && $this->height === 0)
)
{
return;
}
if ($this->masterDim === 'width')
{
$this->height = (int) ceil($this->width * $this->image->origHeight / $this->image->origWidth);
}
else
{
$this->width = (int) ceil($this->image->origWidth * $this->height / $this->image->origHeight);
}
}
//--------------------------------------------------------------------
// accessor for testing; not part of interface
public function getWidth()
{
return ($this->resource !== null) ? $this->_getWidth() : $this->width;
}
// accessor for testing; not part of interface
public function getHeight()
{
return ($this->resource !== null) ? $this->_getHeight() : $this->height;
}
}
Jim Parry