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<?php
namespace Gumlet;
use Exception;
/**
* PHP class to resize and scale images
*/
class ImageResize
{
const CROPTOP = 1;
const CROPCENTRE = 2;
const CROPCENTER = 2;
const CROPBOTTOM = 3;
const CROPLEFT = 4;
const CROPRIGHT = 5;
const CROPTOPCENTER = 6;
const IMG_FLIP_HORIZONTAL = 0;
const IMG_FLIP_VERTICAL = 1;
const IMG_FLIP_BOTH = 2;
public $quality_jpg = 85;
public $quality_webp = 85;
public $quality_png = 6;
public $quality_truecolor = true;
public $gamma_correct = true;
public $interlace = 1;
public $source_type;
protected $source_image;
protected $original_w;
protected $original_h;
protected $dest_x = 0;
protected $dest_y = 0;
protected $source_x;
protected $source_y;
protected $dest_w;
protected $dest_h;
protected $source_w;
protected $source_h;
protected $source_info;
protected $filters = [];
/**
* Create instance from a strng
*
* @param string $image_data
* @return ImageResize
* @throws ImageResizeException
*/
public static function createFromString($image_data)
{
if (empty($image_data) || $image_data === null) {
throw new ImageResizeException('image_data must not be empty');
}
$resize = new self('data://application/octet-stream;base64,' . base64_encode($image_data));
return $resize;
}
/**
* Add filter function for use right before save image to file.
*
* @param callable $filter
* @return $this
*/
public function addFilter(callable $filter)
{
$this->filters[] = $filter;
return $this;
}
/**
* Apply filters.
*
* @param $image resource an image resource identifier
* @param $filterType filter type and default value is IMG_FILTER_NEGATE
*/
protected function applyFilter($image, $filterType = IMG_FILTER_NEGATE)
{
foreach ($this->filters as $function) {
$function($image, $filterType);
}
}
/**
* Loads image source and its properties to the instanciated object
*
* @param string $filename
* @return ImageResize
* @throws ImageResizeException
*/
public function __construct($filename)
{
if (!defined('IMAGETYPE_WEBP')) {
define('IMAGETYPE_WEBP', 18);
}
if ($filename === null || empty($filename) || (substr($filename, 0, 5) !== 'data:' && !is_file($filename))) {
throw new ImageResizeException('File does not exist');
}
$finfo = finfo_open(FILEINFO_MIME_TYPE);
if (strstr(finfo_file($finfo, $filename), 'image') === false) {
throw new ImageResizeException('Unsupported file type');
}
if (!$image_info = getimagesize($filename, $this->source_info)) {
$image_info = getimagesize($filename);
}
if (!$image_info) {
throw new ImageResizeException('Could not read file');
}
list(
$this->original_w,
$this->original_h,
$this->source_type
) = $image_info;
switch ($this->source_type) {
case IMAGETYPE_GIF:
$this->source_image = imagecreatefromgif($filename);
break;
case IMAGETYPE_JPEG:
$this->source_image = $this->imageCreateJpegfromExif($filename);
// set new width and height for image, maybe it has changed
$this->original_w = imagesx($this->source_image);
$this->original_h = imagesy($this->source_image);
break;
case IMAGETYPE_PNG:
$this->source_image = imagecreatefrompng($filename);
break;
case IMAGETYPE_WEBP:
if (version_compare(PHP_VERSION, '5.5.0', '<')) {
throw new ImageResizeException('For WebP support PHP >= 5.5.0 is required');
}
$this->source_image = imagecreatefromwebp($filename);
break;
default:
throw new ImageResizeException('Unsupported image type');
}
if (!$this->source_image) {
throw new ImageResizeException('Could not load image');
}
return $this->resize($this->getSourceWidth(), $this->getSourceHeight());
}
// http://stackoverflow.com/a/28819866
public function imageCreateJpegfromExif($filename)
{
$img = imagecreatefromjpeg($filename);
if (!function_exists('exif_read_data') || !isset($this->source_info['APP1']) || strpos($this->source_info['APP1'], 'Exif') !== 0) {
return $img;
}
try {
$exif = @exif_read_data($filename);
} catch (Exception $e) {
$exif = null;
}
if (!$exif || !isset($exif['Orientation'])) {
return $img;
}
$orientation = $exif['Orientation'];
if ($orientation === 6 || $orientation === 5) {
$img = imagerotate($img, 270, null);
} elseif ($orientation === 3 || $orientation === 4) {
$img = imagerotate($img, 180, null);
} elseif ($orientation === 8 || $orientation === 7) {
$img = imagerotate($img, 90, null);
}
if ($orientation === 5 || $orientation === 4 || $orientation === 7) {
if(function_exists('imageflip')) {
imageflip($img, IMG_FLIP_HORIZONTAL);
} else {
$this->imageFlip($img, IMG_FLIP_HORIZONTAL);
}
}
return $img;
}
/**
* Saves new image
*
* @param string $filename
* @param string $image_type
* @param integer $quality
* @param integer $permissions
* @param boolean $exact_size
* @return static
*/
public function save($filename, $image_type = null, $quality = null, $permissions = null, $exact_size = false)
{
$image_type = $image_type ?: $this->source_type;
$quality = is_numeric($quality) ? (int) abs($quality) : null;
switch ($image_type) {
case IMAGETYPE_GIF:
if( !empty($exact_size) && is_array($exact_size) ){
$dest_image = imagecreatetruecolor($exact_size[0], $exact_size[1]);
} else{
$dest_image = imagecreatetruecolor($this->getDestWidth(), $this->getDestHeight());
}
$background = imagecolorallocatealpha($dest_image, 255, 255, 255, 1);
imagecolortransparent($dest_image, $background);
imagefill($dest_image, 0, 0, $background);
imagesavealpha($dest_image, true);
break;
case IMAGETYPE_JPEG:
if( !empty($exact_size) && is_array($exact_size) ){
$dest_image = imagecreatetruecolor($exact_size[0], $exact_size[1]);
$background = imagecolorallocate($dest_image, 255, 255, 255);
imagefilledrectangle($dest_image, 0, 0, $exact_size[0], $exact_size[1], $background);
} else{
$dest_image = imagecreatetruecolor($this->getDestWidth(), $this->getDestHeight());
$background = imagecolorallocate($dest_image, 255, 255, 255);
imagefilledrectangle($dest_image, 0, 0, $this->getDestWidth(), $this->getDestHeight(), $background);
}
break;
case IMAGETYPE_WEBP:
if (version_compare(PHP_VERSION, '5.5.0', '<')) {
throw new ImageResizeException('For WebP support PHP >= 5.5.0 is required');
}
if( !empty($exact_size) && is_array($exact_size) ){
$dest_image = imagecreatetruecolor($exact_size[0], $exact_size[1]);
$background = imagecolorallocate($dest_image, 255, 255, 255);
imagefilledrectangle($dest_image, 0, 0, $exact_size[0], $exact_size[1], $background);
} else{
$dest_image = imagecreatetruecolor($this->getDestWidth(), $this->getDestHeight());
$background = imagecolorallocate($dest_image, 255, 255, 255);
imagefilledrectangle($dest_image, 0, 0, $this->getDestWidth(), $this->getDestHeight(), $background);
}
break;
case IMAGETYPE_PNG:
if (!$this->quality_truecolor && !imageistruecolor($this->source_image)) {
if( !empty($exact_size) && is_array($exact_size) ){
$dest_image = imagecreate($exact_size[0], $exact_size[1]);
} else{
$dest_image = imagecreate($this->getDestWidth(), $this->getDestHeight());
}
} else {
if( !empty($exact_size) && is_array($exact_size) ){
$dest_image = imagecreatetruecolor($exact_size[0], $exact_size[1]);
} else{
$dest_image = imagecreatetruecolor($this->getDestWidth(), $this->getDestHeight());
}
}
imagealphablending($dest_image, false);
imagesavealpha($dest_image, true);
$background = imagecolorallocatealpha($dest_image, 255, 255, 255, 127);
imagecolortransparent($dest_image, $background);
imagefill($dest_image, 0, 0, $background);
break;
}
imageinterlace($dest_image, $this->interlace);
if ($this->gamma_correct) {
imagegammacorrect($this->source_image, 2.2, 1.0);
}
if( !empty($exact_size) && is_array($exact_size) ) {
if ($this->getSourceHeight() < $this->getSourceWidth()) {
$this->dest_x = 0;
$this->dest_y = ($exact_size[1] - $this->getDestHeight()) / 2;
}
if ($this->getSourceHeight() > $this->getSourceWidth()) {
$this->dest_x = ($exact_size[0] - $this->getDestWidth()) / 2;
$this->dest_y = 0;
}
}
imagecopyresampled(
$dest_image,
$this->source_image,
$this->dest_x,
$this->dest_y,
$this->source_x,
$this->source_y,
$this->getDestWidth(),
$this->getDestHeight(),
$this->source_w,
$this->source_h
);
if ($this->gamma_correct) {
imagegammacorrect($dest_image, 1.0, 2.2);
}
$this->applyFilter($dest_image);
switch ($image_type) {
case IMAGETYPE_GIF:
imagegif($dest_image, $filename);
break;
case IMAGETYPE_JPEG:
if ($quality === null || $quality > 100) {
$quality = $this->quality_jpg;
}
imagejpeg($dest_image, $filename, $quality);
break;
case IMAGETYPE_WEBP:
if (version_compare(PHP_VERSION, '5.5.0', '<')) {
throw new ImageResizeException('For WebP support PHP >= 5.5.0 is required');
}
if ($quality === null) {
$quality = $this->quality_webp;
}
imagewebp($dest_image, $filename, $quality);
break;
case IMAGETYPE_PNG:
if ($quality === null || $quality > 9) {
$quality = $this->quality_png;
}
imagepng($dest_image, $filename, $quality);
break;
}
if ($permissions) {
chmod($filename, $permissions);
}
imagedestroy($dest_image);
return $this;
}
/**
* Convert the image to string
*
* @param int $image_type
* @param int $quality
* @return string
*/
public function getImageAsString($image_type = null, $quality = null)
{
$string_temp = tempnam(sys_get_temp_dir(), '');
$this->save($string_temp, $image_type, $quality);
$string = file_get_contents($string_temp);
unlink($string_temp);
return $string;
}
/**
* Convert the image to string with the current settings
*
* @return string
*/
public function __toString()
{
return $this->getImageAsString();
}
/**
* Outputs image to browser
* @param string $image_type
* @param integer $quality
*/
public function output($image_type = null, $quality = null)
{
$image_type = $image_type ?: $this->source_type;
header('Content-Type: ' . image_type_to_mime_type($image_type));
$this->save(null, $image_type, $quality);
}
/**
* Resizes image according to the given short side (short side proportional)
*
* @param integer $max_short
* @param boolean $allow_enlarge
* @return static
*/
public function resizeToShortSide($max_short, $allow_enlarge = false)
{
if ($this->getSourceHeight() < $this->getSourceWidth()) {
$ratio = $max_short / $this->getSourceHeight();
$long = $this->getSourceWidth() * $ratio;
$this->resize($long, $max_short, $allow_enlarge);
} else {
$ratio = $max_short / $this->getSourceWidth();
$long = $this->getSourceHeight() * $ratio;
$this->resize($max_short, $long, $allow_enlarge);
}
return $this;
}
/**
* Resizes image according to the given long side (short side proportional)
*
* @param integer $max_long
* @param boolean $allow_enlarge
* @return static
*/
public function resizeToLongSide($max_long, $allow_enlarge = false)
{
if ($this->getSourceHeight() > $this->getSourceWidth()) {
$ratio = $max_long / $this->getSourceHeight();
$short = $this->getSourceWidth() * $ratio;
$this->resize($short, $max_long, $allow_enlarge);
} else {
$ratio = $max_long / $this->getSourceWidth();
$short = $this->getSourceHeight() * $ratio;
$this->resize($max_long, $short, $allow_enlarge);
}
return $this;
}
/**
* Resizes image according to the given height (width proportional)
*
* @param integer $height
* @param boolean $allow_enlarge
* @return static
*/
public function resizeToHeight($height, $allow_enlarge = false)
{
$ratio = $height / $this->getSourceHeight();
$width = $this->getSourceWidth() * $ratio;
$this->resize($width, $height, $allow_enlarge);
return $this;
}
/**
* Resizes image according to the given width (height proportional)
*
* @param integer $width
* @param boolean $allow_enlarge
* @return static
*/
public function resizeToWidth($width, $allow_enlarge = false)
{
$ratio = $width / $this->getSourceWidth();
$height = $this->getSourceHeight() * $ratio;
$this->resize($width, $height, $allow_enlarge);
return $this;
}
/**
* Resizes image to best fit inside the given dimensions
*
* @param integer $max_width
* @param integer $max_height
* @param boolean $allow_enlarge
* @return static
*/
public function resizeToBestFit($max_width, $max_height, $allow_enlarge = false)
{
if ($this->getSourceWidth() <= $max_width && $this->getSourceHeight() <= $max_height && $allow_enlarge === false) {
return $this;
}
$ratio = $this->getSourceHeight() / $this->getSourceWidth();
$width = $max_width;
$height = $width * $ratio;
if ($height > $max_height) {
$height = $max_height;
$width = $height / $ratio;
}
return $this->resize($width, $height, $allow_enlarge);
}
/**
* Resizes image according to given scale (proportionally)
*
* @param integer|float $scale
* @return static
*/
public function scale($scale)
{
$width = $this->getSourceWidth() * $scale / 100;
$height = $this->getSourceHeight() * $scale / 100;
$this->resize($width, $height, true);
return $this;
}
/**
* Resizes image according to the given width and height
*
* @param integer $width
* @param integer $height
* @param boolean $allow_enlarge
* @return static
*/
public function resize($width, $height, $allow_enlarge = false)
{
if (!$allow_enlarge) {
// if the user hasn't explicitly allowed enlarging,
// but either of the dimensions are larger then the original,
// then just use original dimensions - this logic may need rethinking
if ($width > $this->getSourceWidth() || $height > $this->getSourceHeight()) {
$width = $this->getSourceWidth();
$height = $this->getSourceHeight();
}
}
$this->source_x = 0;
$this->source_y = 0;
$this->dest_w = $width;
$this->dest_h = $height;
$this->source_w = $this->getSourceWidth();
$this->source_h = $this->getSourceHeight();
return $this;
}
/**
* Crops image according to the given width, height and crop position
*
* @param integer $width
* @param integer $height
* @param boolean $allow_enlarge
* @param integer $position
* @return static
*/
public function crop($width, $height, $allow_enlarge = false, $position = self::CROPCENTER)
{
if (!$allow_enlarge) {
// this logic is slightly different to resize(),
// it will only reset dimensions to the original
// if that particular dimenstion is larger
if ($width > $this->getSourceWidth()) {
$width = $this->getSourceWidth();
}
if ($height > $this->getSourceHeight()) {
$height = $this->getSourceHeight();
}
}
$ratio_source = $this->getSourceWidth() / $this->getSourceHeight();
$ratio_dest = $width / $height;
if ($ratio_dest < $ratio_source) {
$this->resizeToHeight($height, $allow_enlarge);
$excess_width = ($this->getDestWidth() - $width) / $this->getDestWidth() * $this->getSourceWidth();
$this->source_w = $this->getSourceWidth() - $excess_width;
$this->source_x = $this->getCropPosition($excess_width, $position);
$this->dest_w = $width;
} else {
$this->resizeToWidth($width, $allow_enlarge);
$excess_height = ($this->getDestHeight() - $height) / $this->getDestHeight() * $this->getSourceHeight();
$this->source_h = $this->getSourceHeight() - $excess_height;
$this->source_y = $this->getCropPosition($excess_height, $position);
$this->dest_h = $height;
}
return $this;
}
/**
* Crops image according to the given width, height, x and y
*
* @param integer $width
* @param integer $height
* @param integer $x
* @param integer $y
* @return static
*/
public function freecrop($width, $height, $x = false, $y = false)
{
if ($x === false || $y === false) {
return $this->crop($width, $height);
}
$this->source_x = $x;
$this->source_y = $y;
if ($width > $this->getSourceWidth() - $x) {
$this->source_w = $this->getSourceWidth() - $x;
} else {
$this->source_w = $width;
}
if ($height > $this->getSourceHeight() - $y) {
$this->source_h = $this->getSourceHeight() - $y;
} else {
$this->source_h = $height;
}
$this->dest_w = $width;
$this->dest_h = $height;
return $this;
}
/**
* Gets source width
*
* @return integer
*/
public function getSourceWidth()
{
return $this->original_w;
}
/**
* Gets source height
*
* @return integer
*/
public function getSourceHeight()
{
return $this->original_h;
}
/**
* Gets width of the destination image
*
* @return integer
*/
public function getDestWidth()
{
return $this->dest_w;
}
/**
* Gets height of the destination image
* @return integer
*/
public function getDestHeight()
{
return $this->dest_h;
}
/**
* Gets crop position (X or Y) according to the given position
*
* @param integer $expectedSize
* @param integer $position
* @return float|integer
*/
protected function getCropPosition($expectedSize, $position = self::CROPCENTER)
{
$size = 0;
switch ($position) {
case self::CROPBOTTOM:
case self::CROPRIGHT:
$size = $expectedSize;
break;
case self::CROPCENTER:
case self::CROPCENTRE:
$size = $expectedSize / 2;
break;
case self::CROPTOPCENTER:
$size = $expectedSize / 4;
break;
}
return $size;
}
/**
* Flips an image using a given mode if PHP version is lower than 5.5
*
* @param resource $image
* @param integer $mode
* @return null
*/
public function imageFlip($image, $mode)
{
switch($mode) {
case self::IMG_FLIP_HORIZONTAL: {
$max_x = imagesx($image) - 1;
$half_x = $max_x / 2;
$sy = imagesy($image);
$temp_image = imageistruecolor($image)? imagecreatetruecolor(1, $sy): imagecreate(1, $sy);
for ($x = 0; $x < $half_x; ++$x) {
imagecopy($temp_image, $image, 0, 0, $x, 0, 1, $sy);
imagecopy($image, $image, $x, 0, $max_x - $x, 0, 1, $sy);
imagecopy($image, $temp_image, $max_x - $x, 0, 0, 0, 1, $sy);
}
break;
}
case self::IMG_FLIP_VERTICAL: {
$sx = imagesx($image);
$max_y = imagesy($image) - 1;
$half_y = $max_y / 2;
$temp_image = imageistruecolor($image)? imagecreatetruecolor($sx, 1): imagecreate($sx, 1);
for ($y = 0; $y < $half_y; ++$y) {
imagecopy($temp_image, $image, 0, 0, 0, $y, $sx, 1);
imagecopy($image, $image, 0, $y, 0, $max_y - $y, $sx, 1);
imagecopy($image, $temp_image, 0, $max_y - $y, 0, 0, $sx, 1);
}
break;
}
case self::IMG_FLIP_BOTH: {
$sx = imagesx($image);
$sy = imagesy($image);
$temp_image = imagerotate($image, 180, 0);
imagecopy($image, $temp_image, 0, 0, 0, 0, $sx, $sy);
break;
}
default:
return null;
}
imagedestroy($temp_image);
}
/**
* Enable or not the gamma color correction on the image, enabled by default
*
* @param bool $enable
* @return static
*/
public function gamma($enable = true)
{
$this->gamma_correct = $enable;
return $this;
}
}
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