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php-cimage/CImage.php
Mikael Roos 7849f69801 support jpeg file extension
2013-10-15 01:01:15 +02:00

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<?php
/**
* Resize and crop images on the fly. Store generated images in a cache.
*
* @author Mikael Roos mos@dbwebb.se
* @example http://mikaelroos.se/cimage/test.php
* @link https://github.com/mosbth/cimage
*/
class CImage {
/**
* Constants
*/
const PNG_GREYSCALE = 0;
const PNG_RGB = 2;
const PNG_RGB_PALETTE = 3;
const PNG_GREYSCALE_ALPHA = 4;
const PNG_RGB_ALPHA = 6;
const PNG_QUALITY_DEFAULT = -1;
const JPEG_QUALITY_DEFAULT = 60;
/**
* Properties
*/
private $image = null; // Object for open image
public $imageFolder; // root folder of images
public $imageName; // image filename, may include subdirectory, relative from $imageFolder
public $pathToImage; // $imageFolder . '/' . $imageName;
private $fileExtension;
public $newWidth;
public $newHeight;
private $cropWidth;
private $cropHeight;
public $keepRatio;
public $cropToFit;
public $crop;
public $crop_x;
public $crop_y;
private $quality;
public $filters;
public $saveFolder;
public $newName;
//private $newFileName; // OBSOLETE, using cacheFileName instead.
private $mime; // Calculated from source image
private $width; // Calculated from source image
private $height; // Calculated from source image
private $type; // Calculated from source image
private $attr; // Calculated from source image
private $validExtensions = array('jpg', 'jpeg', 'png', 'gif');
private $verbose; // Print out a trace together with original and created image
private $log; // Keep a log/trace on what happens.
private $cacheFileName; // Filename of the new image in the cache.
private $useCache; // Use the cache if true, set to false to ignore the cached file.
private $useOriginal; // Use original image if possible
private $saveAs; // Define a format to save image as, or null to use original format.
private $extension; // Extension to save image as.
// Specific for PNG
private $pngType; // Find out which type of PNG image it is.
private $pngFilter; // Path to command for filter optimize, for example optipng or null.
private $pngDeflate; // Path to command for deflate optimize, for example pngout or null.
// Specific for JPEG
private $jpegOptimize; // Path to command to optimize jpeg images, for example jpegtran or null.
/**
* Constructor, can take arguments to init the object.
*
* @param string $imageName filename which may contain subdirectory.
* @param string $imageFolder path to root folder for images.
* @param string $saveFolder path to folder where to save the new file or null to skip saving.
* @param string $newName new filename or leave to null to autogenerate filename.
*/
public function __construct($imageName=null, $imageFolder=null, $saveFolder=null, $newName=null) {
$this->imageName = ltrim($imageName, '/');
$this->imageFolder = rtrim($imageFolder, '/');
$this->pathToImage = $this->imageFolder . '/' . $this->imageName;
$this->fileExtension = pathinfo($this->pathToImage, PATHINFO_EXTENSION);
$this->extension = $this->fileExtension;
$this->saveFolder = $saveFolder;
$this->newName = $newName;
}
/**
* Log an event.
*
* @param string $message to log.
*/
public function Log($message) {
if($this->verbose) {
$this->log[] = $message;
}
}
/**
* Do verbose output and print out the log and the actual images.
*
*/
public function VerboseOutput() {
$log = null;
$this->Log("Memory peak: " . round(memory_get_peak_usage() /1024/1024) . "M");
$this->Log("Memory limit: " . ini_get('memory_limit'));
foreach($this->log as $val) {
if(is_array($val)) {
foreach($val as $val1) {
$log .= htmlentities($val1) . '<br/>';
}
}
else {
$log .= htmlentities($val) . '<br/>';
}
}
$object = null; //print_r($this, 1);
echo <<<EOD
<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>CImage verbose output</title>
<style>body{background-color: #ddd}</style>
<h1>CImage Verbose Output</h1>
<pre>{$log}</pre>
<pre>{$object}</pre>
EOD;
}
/**
* Raise error, enables to implement a selection of error methods.
*
* @param $message string the error message to display.
*/
public function RaiseError($message) {
throw new Exception($message);
}
/*
* Create filename to save file in cache.
*/
public function CreateFilename() {
$parts = pathinfo($this->pathToImage);
$cropToFit = $this->cropToFit ? '_cf' : null;
$crop_x = $this->crop_x ? "_x{$this->crop_x}" : null;
$crop_y = $this->crop_y ? "_y{$this->crop_y}" : null;
$scale = $this->scale ? "_s{$this->scale}" : null;
$quality = $this->quality ? "_q{$this->quality}" : null;
$offset = isset($this->offset) ? '_o' . $this->offset['top'] . '-' . $this->offset['right'] . '-' . $this->offset['bottom'] . '-' . $this->offset['left'] : null;
$crop = $this->crop ? '_c' . $this->crop['width'] . '-' . $this->crop['height'] . '-' . $this->crop['start_x'] . '-' . $this->crop['start_y'] : null;
$filters = null;
if(isset($this->filters)) {
foreach($this->filters as $filter) {
if(is_array($filter)) {
$filters .= "_f{$filter['id']}";
for($i=1;$i<=$filter['argc'];$i++) {
$filters .= ":".$filter["arg{$i}"];
}
}
}
}
$sharpen = $this->sharpen ? 's' : null;
$emboss = $this->emboss ? 'e' : null;
$blur = $this->blur ? 'b' : null;
$palette = $this->palette ? 'p' : null;
$this->extension = isset($this->extension) ? $this->extension : $parts['extension'];
// Check optimizing options
$optimize = null;
if($this->extension == 'jpeg' || $this->extension == 'jpg') {
$optimize = $this->jpegOptimize ? 'o' : null;
}
else if($this->extension == 'png') {
$optimize .= $this->pngFilter ? 'f' : null;
$optimize .= $this->pngDeflate ? 'd' : null;
}
$subdir = str_replace('/', '-', dirname($this->imageName));
$subdir = ($subdir == '.') ? '_.' : $subdir;
$this->cacheFileName = $this->saveFolder . '/' . $subdir . '_' . $parts['filename'] . '_' . round($this->newWidth) . '_' . round($this->newHeight) . $offset . $crop . $cropToFit . $crop_x . $crop_y . $quality . $filters . $sharpen . $emboss . $blur . $palette . $optimize . $scale . '.' . $this->extension;
// Sanitize filename
$this->cacheFileName = preg_replace('/^a-zA-Z0-9\.-_/', '', $this->cacheFileName);
$this->Log("The cache file name is: " . $this->cacheFileName);
return $this;
}
/**
* Init and do some sanity checks before any processing is done. Throws exception if not valid.
*/
public function Init() {
// Get details on image
$info = list($this->width, $this->height, $this->type, $this->attr) = getimagesize($this->pathToImage);
!empty($info) or $this->RaiseError("The file doesn't seem to be an image.");
$this->mime = $info['mime'];
if($this->verbose) {
$this->Log("Image file: {$this->pathToImage}");
$this->Log("Image width x height (type): {$this->width} x {$this->height} ({$this->type}).");
$this->Log("Image filesize: " . filesize($this->pathToImage) . " bytes.");
}
// width as %
if($this->newWidth[strlen($this->newWidth)-1] == '%') {
$this->newWidth = $this->width * substr($this->newWidth, 0, -1) / 100;
$this->Log("Setting new width based on % to {$this->newWidth}");
}
// height as %
if($this->newHeight[strlen($this->newHeight)-1] == '%') {
$this->newHeight = $this->height * substr($this->newHeight, 0, -1) / 100;
$this->Log("Setting new height based on % to {$this->newHeight}");
}
is_null($this->aspectRatio) or is_numeric($this->aspectRatio) or $this->RaiseError('Aspect ratio out of range');
// width & height from aspect ratio
if($this->aspectRatio && is_null($this->newWidth) && is_null($this->newHeight)) {
// set new width and height based on current & aspect ratio, but base on largest dimension to only shrink image, not enlarge
if($this->aspectRatio >= 1) {
$this->newWidth = $this->width;
$this->newHeight = $this->width / $this->aspectRatio;
$this->Log("Setting new width & height based on width & aspect ratio (>=1) to (w x h) {$this->newWidth} x {$this->newHeight}");
}
else {
$this->newHeight = $this->height;
$this->newWidth = $this->height * $this->aspectRatio;
$this->Log("Setting new width & height based on width & aspect ratio (<1) to (w x h) {$this->newWidth} x {$this->newHeight}");
}
}
else if($this->aspectRatio && is_null($this->newWidth)) {
$this->newWidth = $this->newHeight * $this->aspectRatio;
$this->Log("Setting new width based on aspect ratio to {$this->newWidth}");
}
else if($this->aspectRatio && is_null($this->newHeight)) {
//$this->newHeight = ($this->aspectRatio >= 0) ? ($this->newWidth / $this->aspectRatio) : ($this->newWidth * $this->aspectRatio);
$this->newHeight = $this->newWidth / $this->aspectRatio;
$this->Log("Setting new height based on aspect ratio to {$this->newHeight}");
}
// Check values to be within domain
is_null($this->newWidth) or is_numeric($this->newWidth) or $this->RaiseError('Width not numeric');
is_null($this->newHeight) or is_numeric($this->newHeight) or $this->RaiseError('Height not numeric');
is_null($this->quality) or (is_numeric($this->quality) and $this->quality > 0 and $this->quality <= 100) or $this->RaiseError('Quality not in range.');
//is_numeric($this->crop_x) && is_numeric($this->crop_y) or $this->RaiseError('Quality not in range.');
//filter
is_readable($this->pathToImage) or $this->RaiseError('File does not exist.');
in_array($this->fileExtension, $this->validExtensions) or $this->RaiseError('Not a valid file extension.');
is_null($this->saveFolder) or is_writable($this->saveFolder) or $this->RaiseError('Save directory does not exist or is not writable.');
return $this;
}
/**
* Output image using caching.
*
*/
protected function Output($file) {
if($this->verbose) {
$this->Log("Outputting image: $file");
}
// Get details on image
$info = list($width, $height, $type, $attr) = getimagesize($file);
!empty($info) or $this->RaiseError("The file doesn't seem to be an image.");
$mime = $info['mime'];
$lastModified = filemtime($file);
$gmdate = gmdate("D, d M Y H:i:s", $lastModified);
if(!$this->verbose) { header('Last-Modified: ' . $gmdate . " GMT"); }
if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) == $lastModified){
if($this->verbose) {
$this->Log("304 not modified");
$this->VerboseOutput();
exit;
}
header("HTTP/1.0 304 Not Modified");
} else {
if($this->verbose) {
$this->Log("Last modified: " . $gmdate . " GMT");
$this->VerboseOutput();
exit;
}
header('Content-type: ' . $mime);
readfile($file);
}
exit;
}
/**
* Get the type of PNG image.
*
*/
public function GetPngType() {
$this->pngType = ord (file_get_contents ($this->pathToImage, false, null, 25, 1));
if($this->pngType == self::PNG_GREYSCALE) {
$this->Log("PNG is type 0, Greyscale.");
}
else if($this->pngType == self::PNG_RGB) {
$this->Log("PNG is type 2, RGB");
}
else if($this->pngType == self::PNG_RGB_PALETTE) {
$this->Log("PNG is type 3, RGB with palette");
}
else if($this->pngType == self::PNG_GREYSCALE_ALPHA) {
$this->Log("PNG is type 4, Greyscale with alpha channel");
}
else if($this->pngType == self::PNG_RGB_ALPHA) {
$this->Log("PNG is type 6, RGB with alpha channel (PNG 32-bit)");
}
return $this->pngType;
}
/**
* Set quality of image
*
*/
protected function SetQuality() {
if(!$this->quality) {
switch($this->extension) {
case 'jpg':
$this->quality = self::JPEG_QUALITY_DEFAULT;
break;
case 'png':
$this->quality = self::PNG_QUALITY_DEFAULT;
break;
default:
$this->quality = null;
}
}
$this->Log("Setting quality to {$this->quality}.");
return $this;
}
/**
* Set optmizing options.
*
*/
protected function SetOptimization() {
if(defined('JPEG_OPTIMIZE')) {
$this->jpegOptimize = JPEG_OPTIMIZE;
}
if(defined('PNG_FILTER')) {
$this->pngFilter = PNG_FILTER;
}
if(defined('PNG_DEFLATE')) {
$this->pngDeflate = PNG_DEFLATE;
}
return $this;
}
/**
* Calciulate number of colors in an image.
*
* @param resource $im the image.
*/
protected function ColorsTotal($im) {
if(imageistruecolor($im)) {
$h = imagesy($im);
$w = imagesx($im);
$c = array();
for($x=0; $x < $w; $x++) {
for($y=0; $y < $h; $y++) {
@$c['c'.imagecolorat($im, $x, $y)]++;
}
}
return count($c);
}
else {
return imagecolorstotal($im);
}
}
/**
* Open image.
*
*/
protected function Open() {
$this->Log("Opening file as {$this->fileExtension}.");
switch($this->fileExtension) {
case 'jpg':
case 'jpeg':
$this->image = @imagecreatefromjpeg($this->pathToImage);
break;
case 'gif':
$this->image = @imagecreatefromgif($this->pathToImage);
break;
case 'png':
$this->image = @imagecreatefrompng($this->pathToImage);
$type = $this->GetPngType();
$hasFewColors = imagecolorstotal($this->image);
if($type == self::PNG_RGB_PALETTE || ($hasFewColors > 0 && $hasFewColors <= 256)) {
if($this->verbose) {
$this->Log("Handle this image as a palette image.");
}
$this->palette = true;
}
break;
default: $this->image = false; $this->RaiseError('No support for this file extension.');
}
if($this->verbose) {
$this->Log("imageistruecolor() : " . (imageistruecolor($this->image) ? 'true' : 'false'));
$this->Log("imagecolorstotal() : " . imagecolorstotal($this->image));
$this->Log("Number of colors in image = " . $this->ColorsTotal($this->image));
}
return $this;
}
/**
* Map filter name to PHP filter and id.
*
* @param string $name the name of the filter.
*/
private function MapFilter($name) {
$map = array(
'negate' => array('id'=>0, 'argc'=>0, 'type'=>IMG_FILTER_NEGATE),
'grayscale' => array('id'=>1, 'argc'=>0, 'type'=>IMG_FILTER_GRAYSCALE),
'brightness' => array('id'=>2, 'argc'=>1, 'type'=>IMG_FILTER_BRIGHTNESS),
'contrast' => array('id'=>3, 'argc'=>1, 'type'=>IMG_FILTER_CONTRAST),
'colorize' => array('id'=>4, 'argc'=>4, 'type'=>IMG_FILTER_COLORIZE),
'edgedetect' => array('id'=>5, 'argc'=>0, 'type'=>IMG_FILTER_EDGEDETECT),
'emboss' => array('id'=>6, 'argc'=>0, 'type'=>IMG_FILTER_EMBOSS),
'gaussian_blur' => array('id'=>7, 'argc'=>0, 'type'=>IMG_FILTER_GAUSSIAN_BLUR),
'selective_blur' => array('id'=>8, 'argc'=>0, 'type'=>IMG_FILTER_SELECTIVE_BLUR),
'mean_removal' => array('id'=>9, 'argc'=>0, 'type'=>IMG_FILTER_MEAN_REMOVAL),
'smooth' => array('id'=>10, 'argc'=>1, 'type'=>IMG_FILTER_SMOOTH),
'pixelate' => array('id'=>11, 'argc'=>2, 'type'=>IMG_FILTER_PIXELATE),
);
if(isset($map[$name]))
return $map[$name];
else {
$this->RaiseError('No such filter.');
}
}
/**
* Calculate new width and height of image.
*/
protected function CalculateNewWidthAndHeight() {
// Crop, use cropped width and height as base for calulations
$this->Log("Calculate new width and height.");
$this->Log("Original width x height is {$this->width} x {$this->height}.");
if(isset($this->area)) {
$this->offset['top'] = round($this->area['top'] / 100 * $this->height);
$this->offset['right'] = round($this->area['right'] / 100 * $this->width);
$this->offset['bottom'] = round($this->area['bottom'] / 100 * $this->height);
$this->offset['left'] = round($this->area['left'] / 100 * $this->width);
$this->offset['width'] = $this->width - $this->offset['left'] - $this->offset['right'];
$this->offset['height'] = $this->height - $this->offset['top'] - $this->offset['bottom'];
$this->width = $this->offset['width'];
$this->height = $this->offset['height'];
$this->Log("The offset for the area to use is top {$this->area['top']}%, right {$this->area['right']}%, bottom {$this->area['bottom']}%, left {$this->area['left']}%.");
$this->Log("The offset for the area to use is top {$this->offset['top']}px, right {$this->offset['right']}px, bottom {$this->offset['bottom']}px, left {$this->offset['left']}px, width {$this->offset['width']}px, height {$this->offset['height']}px.");
}
$width = $this->width;
$height = $this->height;
if($this->crop) {
$width = $this->crop['width'];
$height = $this->crop['height'];
if($this->crop['start_x'] == 'left') {
$this->crop['start_x'] = 0;
}
elseif($this->crop['start_x'] == 'right') {
$this->crop['start_x'] = $this->width - $width;
}
elseif($this->crop['start_x'] == 'center') {
$this->crop['start_x'] = round($this->width / 2) - round($width / 2);
}
if($this->crop['start_y'] == 'top') {
$this->crop['start_y'] = 0;
}
elseif($this->crop['start_y'] == 'bottom') {
$this->crop['start_y'] = $this->height - $height;
}
elseif($this->crop['start_y'] == 'center') {
$this->crop['start_y'] = round($this->height / 2) - round($height / 2);
}
$this->Log("Crop area is width {$width}px, height {$height}px, start_x {$this->crop['start_x']}px, start_y {$this->crop['start_y']}px.");
/*if(empty($this->crop['width'])) {
$this->crop['width'] = $this->width - $this->crop['start_x'];
}
if(empty($this->crop['height'])) {
$this->crop['height'] = $this->height - $this->crop['start_y'];
}*/
}
// Calculate new width and height if keeping aspect-ratio.
if($this->keepRatio) {
// Crop-to-fit and both new width and height are set.
if($this->cropToFit && isset($this->newWidth) && isset($this->newHeight)) {
// Use newWidth and newHeigh as width/height, image should fit in box.
;
}
// Both new width and height are set.
elseif(isset($this->newWidth) && isset($this->newHeight)) {
// Use newWidth and newHeigh as max width/height, image should not be larger.
$ratioWidth = $width / $this->newWidth;
$ratioHeight = $height / $this->newHeight;
$ratio = ($ratioWidth > $ratioHeight) ? $ratioWidth : $ratioHeight;
$this->newWidth = round($width / $ratio);
$this->newHeight = round($height / $ratio);
}
// Use new width as max-width
elseif(isset($this->newWidth)) {
$factor = (float)$this->newWidth / (float)$width;
$this->newHeight = round($factor * $height);
}
// Use new height as max-hight
elseif(isset($this->newHeight)) {
$factor = (float)$this->newHeight / (float)$height;
$this->newWidth = round($factor * $width);
}
// Use newWidth and newHeigh as defined width/height, image should fit the area.
if($this->cropToFit) {
/*
if($cropToFit && $newWidth && $newHeight) {
$targetRatio = $newWidth / $newHeight;
$cropWidth = $targetRatio > $aspectRatio ? $width : round($height * $targetRatio);
$cropHeight = $targetRatio > $aspectRatio ? round($width / $targetRatio) : $height;
}
*/
$ratioWidth = $width / $this->newWidth;
$ratioHeight = $height / $this->newHeight;
$ratio = ($ratioWidth < $ratioHeight) ? $ratioWidth : $ratioHeight;
$this->cropWidth = round($width / $ratio);
$this->cropHeight = round($height / $ratio);
}
}
// Crop, ensure to set new width and height
if($this->crop) {
$this->newWidth = round(isset($this->newWidth) ? $this->newWidth : $this->crop['width']);
$this->newHeight = round(isset($this->newHeight) ? $this->newHeight : $this->crop['height']);
}
// No new height or width is set, use existing measures.
$this->newWidth = round(isset($this->newWidth) ? $this->newWidth : $this->width);
$this->newHeight = round(isset($this->newHeight) ? $this->newHeight : $this->height);
$this->Log("Calculated new width x height as {$this->newWidth} x {$this->newHeight}.");
return $this;
}
/**
* Set extension for filename to save as.
*
*/
private function SetSaveAsExtension() {
if($this->saveAs) {
switch(strtolower($this->saveAs)) {
case 'jpg':
$this->extension = 'jpg';
break;
case 'png':
$this->extension = 'png';
break;
case 'gif':
$this->extension = 'gif';
break;
default:
$this->extension = null;
}
$this->Log("Saving image as: " . $this->extension);
}
return $this;
}
/**
* Use original image if possible.
*
*/
protected function UseOriginalIfPossible() {
if($this->useOriginal &&
($this->newWidth == $this->width) &&
($this->newHeight == $this->height) &&
!$this->quality &&
!$this->area &&
!$this->crop &&
!$this->filters &&
!$this->saveAs &&
!$this->sharpen &&
!$this->emboss &&
!$this->blur &&
!$this->palette) {
$this->Log("Using original image.");
$this->Output($this->pathToImage);
}
}
/**
* Use cached version of image, if possible
*
*/
protected function UseCacheIfPossible() {
if(is_readable($this->cacheFileName)) {
$fileTime = filemtime($this->pathToImage);
$cacheTime = filemtime($this->cacheFileName);
if($fileTime <= $cacheTime) {
if($this->useCache) {
if($this->verbose) {
$this->Log("Use cached file.");
$this->Log("Cached image filesize: " . filesize($this->cacheFileName) . " bytes.");
}
$this->Output($this->cacheFileName);
}
else {
$this->Log("Cache is valid but ignoring it by intention.");
}
}
else {
$this->Log("Original file is modified, ignoring cache.");
}
}
else {
$this->Log("Cachefile does not exists.");
}
return $this;
}
/**
* Sharpen image as http://php.net/manual/en/ref.image.php#56144
* http://loriweb.pair.com/8udf-sharpen.html
*
*/
protected function SharpenImage() {
$matrix = array(
array(-1,-1,-1,),
array(-1,16,-1,),
array(-1,-1,-1,)
);
$divisor = 8;
$offset = 0;
imageconvolution($this->image, $matrix, $divisor, $offset);
return $this;
}
/**
* Emboss image as http://loriweb.pair.com/8udf-emboss.html
*
*/
protected function EmbossImage() {
$matrix = array(
array( 1, 1,-1,),
array( 1, 3,-1,),
array( 1,-1,-1,)
);
$divisor = 3;
$offset = 0;
imageconvolution($this->image, $matrix, $divisor, $offset);
return $this;
}
/**
* Blur image as http://loriweb.pair.com/8udf-basics.html
*
*/
protected function BlurImage() {
$matrix = array(
array( 1, 1, 1,),
array( 1,15, 1,),
array( 1, 1, 1,)
);
$divisor = 23;
$offset = 0;
imageconvolution($this->image, $matrix, $divisor, $offset);
return $this;
}
/**
* Resize the image and optionally store/cache the new imagefile. Output the image.
*
* @param array $args used when processing image.
*/
public function ResizeAndOutput($args) {
$defaults = array(
'newWidth' => null,
'newHeight' => null,
'aspectRatio' => null,
'keepRatio' => true,
'area' => null, //'0,0,0,0',
'scale' => null,
'cropToFit' => false,
'quality' => null,
'deflate' => null,
'crop' => null, //array('width'=>null, 'height'=>null, 'start_x'=>0, 'start_y'=>0),
'filters' => null,
'verbose' => false,
'useCache' => true,
'useOriginal' => true,
'saveAs' => null,
'sharpen' => null,
'emboss' => null,
'blur' => null,
'palette' => null,
);
// Convert crop settins from string to array
if(isset($args['crop']) && !is_array($args['crop'])) {
$pices = explode(',', $args['crop']);
$args['crop'] = array(
'width' => $pices[0],
'height' => $pices[1],
'start_x' => $pices[2],
'start_y' => $pices[3],
);
}
// Convert area settins from string to array
if(isset($args['area']) && !is_array($args['area'])) {
$pices = explode(',', $args['area']);
$args['area'] = array(
'top' => $pices[0],
'right' => $pices[1],
'bottom' => $pices[2],
'left' => $pices[3],
);
}
// Convert filter settins from array of string to array of array
if(isset($args['filters']) && is_array($args['filters'])) {
foreach($args['filters'] as $key => $filterStr) {
$parts = explode(',', $filterStr);
$filter = $this->MapFilter($parts[0]);
$filter['str'] = $filterStr;
for($i=1;$i<=$filter['argc'];$i++) {
if(isset($parts[$i])) {
$filter["arg{$i}"] = $parts[$i];
} else {
$this->RaiseError('Missing arg to filter, review how many arguments are needed at http://php.net/manual/en/function.imagefilter.php');
}
}
$args['filters'][$key] = $filter;
}
}
// Quick solution when introducing parameter deflate, just map it to quality. Should re-engineer usage of quality and deflate.
if(!isset($this->quality) && isset($this->deflate)) {
$this->quality = $this->deflate;
}
// Merge default arguments with incoming and set properties.
//$args = array_merge_recursive($defaults, $args);
$args = array_merge($defaults, $args);
foreach($defaults as $key=>$val) {
$this->{$key} = $args[$key];
}
$this->Log("Resize and output image.");
// Init the object and do sanity checks on arguments
$this->Init()
->CalculateNewWidthAndHeight()
->UseOriginalIfPossible();
// Check cache before resizing.
$this->SetSaveAsExtension()
->SetQuality()
->SetOptimization()
->CreateFilename()
->UseCacheIfPossible();
// Resize and output
$this->Open()
->Resize()
->SaveToCache()
->Output($this->cacheFileName);
}
/**
* Convert true color image to palette image, keeping alpha.
* http://stackoverflow.com/questions/5752514/how-to-convert-png-to-8-bit-png-using-php-gd-library
*/
protected function TrueColorToPalette() {
$img = imagecreatetruecolor($this->width, $this->height);
$bga = imagecolorallocatealpha($img, 0, 0, 0, 127);
imagecolortransparent($img, $bga);
imagefill($img, 0, 0, $bga);
imagecopy($img, $this->image, 0, 0, 0, 0, $this->width, $this->height);
imagetruecolortopalette($img, false, 255);
imagesavealpha($img, true);
if(imageistruecolor($this->image)) {
$this->Log("Matching colors with true color image.");
imagecolormatch($this->image, $img);
}
$this->image = $img;
}
/**
* Create a image and keep transparency for png and gifs.
*
* $param int $width of the new image.
* @param int $height of the new image.
* @returns image resource.
*/
public function CreateImageKeepTransparency($width, $height) {
$this->Log("Creating a new working image width={$width}px, height={$height}px.");
$img = imagecreatetruecolor($width, $height);
imagealphablending($img, false);
imagesavealpha($img, true);
/*
$this->Log("Filling image with background color.");
$bg = imagecolorallocate($img, 255, 255, 255);
imagefill($img, 0, 0, $bg);
*/
return $img;
}
/**
* Resize and or crop the image.
*
*/
public function Resize() {
$this->Log("Starting to Resize()");
// Scale the original image before starting
if(isset($this->scale)) {
$this->Log("Scale by {$this->scale}%");
$newWidth = $this->width * $this->scale / 100;
$newHeight = $this->height * $this->scale / 100;
$img = $this->CreateImageKeepTransparency($newWidth, $newHeight);
imagecopyresampled($img, $this->image, 0, 0, 0, 0, $newWidth, $newHeight, $this->width, $this->height);
$this->image = $img;
$this->width = $newWidth;
$this->height = $newHeight;
}
// Only use a specified area of the image, $this->offset is defining the area to use
if(isset($this->offset)) {
$this->Log("Offset for area to use, cropping it width={$this->offset['width']}, height={$this->offset['height']}, start_x={$this->offset['left']}, start_y={$this->offset['top']}");
$img = $this->CreateImageKeepTransparency($this->offset['width'], $this->offset['height']);
imagecopy($img, $this->image, 0, 0, $this->offset['left'], $this->offset['top'], $this->offset['width'], $this->offset['height']);
$this->image = $img;
$this->width = $this->offset['width'];
$this->height = $this->offset['height'];
}
// SaveAs need to copy image to remove transparency, if any
if($this->saveAs) {
$this->Log("Copying image before saving as another format, loosing transparency, width={$this->width}, height={$this->height}.");
$img = imagecreatetruecolor($this->width, $this->height);
$bg = imagecolorallocate($img, 255, 255, 255);
imagefill($img, 0, 0, $bg);
imagecopy($img, $this->image, 0, 0, 0, 0, $this->width, $this->height);
$this->image = $img;
}
// Do as crop, take only part of image
if($this->crop) {
$this->Log("Cropping area width={$this->crop['width']}, height={$this->crop['height']}, start_x={$this->crop['start_x']}, start_y={$this->crop['start_y']}");
$img = $this->CreateImageKeepTransparency($this->crop['width'], $this->crop['height']);
imagecopyresampled($img, $this->image, 0, 0, $this->crop['start_x'], $this->crop['start_y'], $this->crop['width'], $this->crop['height'], $this->crop['width'], $this->crop['height']);
$this->image = $img;
$this->width = $this->crop['width'];
$this->height = $this->crop['height'];
}
// Resize by crop to fit
if($this->cropToFit) {
/*
$cropX = round(($width - $cropWidth) / 2);
$cropY = round(($height - $cropHeight) / 2);
$imageResized = createImageKeepTransparency($newWidth, $newHeight);
imagecopyresampled($imageResized, $image, 0, 0, $cropX, $cropY, $newWidth, $newHeight, $cropWidth, $cropHeight);
$image = $imageResized;
$width = $newWidth;
$height = $newHeight;
*/
$this->Log("Crop to fit");
$cropX = round(($this->cropWidth/2) - ($this->newWidth/2));
$cropY = round(($this->cropHeight/2) - ($this->newHeight/2));
$imgPreCrop = $this->CreateImageKeepTransparency($this->cropWidth, $this->cropHeight);
$imageResized = $this->CreateImageKeepTransparency($this->newWidth, $this->newHeight);
imagecopyresampled($imgPreCrop, $this->image, 0, 0, 0, 0, $this->cropWidth, $this->cropHeight, $this->width, $this->height);
imagecopyresampled($imageResized, $imgPreCrop, 0, 0, $cropX, $cropY, $this->newWidth, $this->newHeight, $this->newWidth, $this->newHeight);
$this->image = $imageResized;
$this->width = $this->newWidth;
$this->height = $this->newHeight;
}
// Resize it
else if(!($this->newWidth == $this->width && $this->newHeight == $this->height)) {
$this->Log("Resizing, new height and/or width");
$imageResized = $this->CreateImageKeepTransparency($this->newWidth, $this->newHeight);
imagecopyresampled($imageResized, $this->image, 0, 0, 0, 0, $this->newWidth, $this->newHeight, $this->width, $this->height);
//imagecopyresized($imageResized, $this->image, 0, 0, 0, 0, $this->newWidth, $this->newHeight, $this->width, $this->height);
$this->image = $imageResized;
$this->width = $this->newWidth;
$this->height = $this->newHeight;
}
// Apply filters
if(isset($this->filters) && is_array($this->filters)) {
foreach($this->filters as $filter) {
$this->Log("Applying filter $filter.");
switch($filter['argc']) {
case 0: imagefilter($this->image, $filter['type']); break;
case 1: imagefilter($this->image, $filter['type'], $filter['arg1']); break;
case 2: imagefilter($this->image, $filter['type'], $filter['arg1'], $filter['arg2']); break;
case 3: imagefilter($this->image, $filter['type'], $filter['arg1'], $filter['arg2'], $filter['arg3']); break;
case 4: imagefilter($this->image, $filter['type'], $filter['arg1'], $filter['arg2'], $filter['arg3'], $filter['arg4']); break;
}
}
}
// Convert to palette image
if($this->palette) {
$this->Log("Converting to palette image.");
$this->TrueColorToPalette();
}
// Blur the image
if($this->blur) {
$this->Log("Blur.");
$this->BlurImage();
}
// Emboss the image
if($this->emboss) {
$this->Log("Emboss.");
$this->EmbossImage();
}
// Sharpen the image
if($this->sharpen) {
$this->Log("Sharpen.");
$this->SharpenImage();
}
return $this;
}
/**
* Save image to cache
*
*/
protected function SaveToCache() {
switch($this->extension) {
case 'jpeg':
case 'jpg':
if($this->saveFolder) {
$this->Log("Saving image as JPEG to cache using quality = {$this->quality}.");
imagejpeg($this->image, $this->cacheFileName, $this->quality);
// Use JPEG optimize if defined
if($this->jpegOptimize) {
if($this->verbose) { clearstatcache(); $this->Log("Filesize before optimize: " . filesize($this->cacheFileName) . " bytes."); }
$res = array();
$cmd = $this->jpegOptimize . " -outfile $this->cacheFileName $this->cacheFileName";
exec($cmd, $res);
$this->Log($cmd);
$this->Log($res);
}
}
break;
case 'gif':
if($this->saveFolder) {
$this->Log("Saving image as GIF to cache.");
imagegif($this->image, $this->cacheFileName);
}
break;
case 'png':
if($this->saveFolder) {
$this->Log("Saving image as PNG to cache using quality = {$this->quality}.");
// Turn off alpha blending and set alpha flag
imagealphablending($this->image, false);
imagesavealpha($this->image, true);
imagepng($this->image, $this->cacheFileName, $this->quality);
// Use external program to filter PNG, if defined
if($this->pngFilter) {
if($this->verbose) { clearstatcache(); $this->Log("Filesize before filter optimize: " . filesize($this->cacheFileName) . " bytes."); }
$res = array();
$cmd = $this->pngFilter . " $this->cacheFileName";
exec($cmd, $res);
$this->Log($cmd);
$this->Log($res);
}
// Use external program to deflate PNG, if defined
if($this->pngDeflate) {
if($this->verbose) { clearstatcache(); $this->Log("Filesize before deflate optimize: " . filesize($this->cacheFileName) . " bytes."); }
$res = array();
$cmd = $this->pngDeflate . " $this->cacheFileName";
exec($cmd, $res);
$this->Log($cmd);
$this->Log($res);
}
}
break;
default:
$this->RaiseError('No support for this file extension.');
break;
}
if($this->verbose) {
clearstatcache();
$this->Log("Cached image filesize: " . filesize($this->cacheFileName) . " bytes.");
$this->Log("imageistruecolor() : " . (imageistruecolor($this->image) ? 'true' : 'false'));
$this->Log("imagecolorstotal() : " . imagecolorstotal($this->image));
$this->Log("Number of colors in image = " . $this->ColorsTotal($this->image));
}
return $this;
}
}
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