bludit/bl-kernel/helpers/image.class.php

238 lines
6.2 KiB
PHP
Raw Permalink Normal View History

<?php defined('BLUDIT') or die('Bludit CMS.');
class Image {
private $image;
private $width;
private $height;
private $imageResized;
public function setImage($fileName, $newWidth, $newHeight, $option="auto")
{
// *** Open up the file
$this->image = $this->openImage($fileName);
// *** Get width and height
$this->width = imagesx($this->image);
$this->height = imagesy($this->image);
$this->resizeImage($newWidth, $newHeight, $option);
}
2016-01-02 23:51:12 +01:00
public function saveImage($savePath, $imageQuality="100", $forceJPG=false, $forcePNG=false)
{
$extension = strtolower(pathinfo($savePath, PATHINFO_EXTENSION));
// Remove the extension
$filename = substr($savePath, 0,strrpos($savePath,'.'));
$path_complete = $filename.'.'.$extension;
if ($forcePNG) {
2016-01-02 23:51:12 +01:00
$extension = 'png';
} elseif ($forceJPG) {
2016-01-02 23:51:12 +01:00
$extension = 'jpg';
}
switch ($extension) {
2016-01-02 23:51:12 +01:00
case 'jpg':
case 'jpeg':
// Checking for JPG support
if (imagetypes() & IMG_JPG) {
imagejpeg($this->imageResized, $path_complete, $imageQuality);
}
break;
case 'gif':
// Checking for GIF support
if (imagetypes() & IMG_GIF) {
imagegif($this->imageResized, $path_complete);
}
break;
case 'png':
// *** Scale quality from 0-100 to 0-9
$scaleQuality = round(($imageQuality/100) * 9);
// *** Invert quality setting as 0 is best, not 9
$invertScaleQuality = 9 - $scaleQuality;
// Checking for PNG support
if (imagetypes() & IMG_PNG) {
imagepng($this->imageResized, $path_complete, $invertScaleQuality);
}
break;
default:
// Fail extension detection
break;
}
imagedestroy($this->imageResized);
}
private function openImage($file)
{
// *** Get extension
$extension = strtolower(strrchr($file, '.'));
switch($extension)
{
case '.jpg':
case '.jpeg':
$img = imagecreatefromjpeg($file);
break;
case '.gif':
$img = imagecreatefromgif($file);
break;
case '.png':
$img = imagecreatefrompng($file);
break;
default:
$img = false;
break;
}
return $img;
}
private function resizeImage($newWidth, $newHeight, $option)
{
// *** Get optimal width and height - based on $option
$optionArray = $this->getDimensions($newWidth, $newHeight, $option);
$optimalWidth = $optionArray['optimalWidth'];
$optimalHeight = $optionArray['optimalHeight'];
// *** Resample - create image canvas of x, y size
$this->imageResized = imagecreatetruecolor($optimalWidth, $optimalHeight);
imagealphablending($this->imageResized, false);
imagesavealpha($this->imageResized, true);
imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $optimalWidth, $optimalHeight, $this->width, $this->height);
// *** if option is 'crop', then crop too
if ($option == 'crop') {
$this->crop($optimalWidth, $optimalHeight, $newWidth, $newHeight);
}
}
private function getDimensions($newWidth, $newHeight, $option)
{
if( ($this->width < $newWidth) and ($this->height < $newHeight) )
{
return array('optimalWidth' => $this->width, 'optimalHeight' => $this->height);
}
switch ($option)
{
case 'exact':
$optimalWidth = $newWidth;
$optimalHeight= $newHeight;
break;
case 'portrait':
$optimalWidth = $this->getSizeByFixedHeight($newHeight);
$optimalHeight= $newHeight;
break;
case 'landscape':
$optimalWidth = $newWidth;
$optimalHeight= $this->getSizeByFixedWidth($newWidth);
break;
case 'auto':
$optionArray = $this->getSizeByAuto($newWidth, $newHeight);
$optimalWidth = $optionArray['optimalWidth'];
$optimalHeight = $optionArray['optimalHeight'];
break;
case 'crop':
$optionArray = $this->getOptimalCrop($newWidth, $newHeight);
$optimalWidth = $optionArray['optimalWidth'];
$optimalHeight = $optionArray['optimalHeight'];
break;
}
return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
}
private function getSizeByFixedHeight($newHeight)
{
$ratio = $this->width / $this->height;
$newWidth = $newHeight * $ratio;
return $newWidth;
}
private function getSizeByFixedWidth($newWidth)
{
$ratio = $this->height / $this->width;
$newHeight = $newWidth * $ratio;
return $newHeight;
}
private function getSizeByAuto($newWidth, $newHeight)
{
if ($this->height < $this->width)
// *** Image to be resized is wider (landscape)
{
$optimalWidth = $newWidth;
$optimalHeight= $this->getSizeByFixedWidth($newWidth);
}
elseif ($this->height > $this->width)
// *** Image to be resized is taller (portrait)
{
$optimalWidth = $this->getSizeByFixedHeight($newHeight);
$optimalHeight= $newHeight;
}
else
// *** Image to be resizerd is a square
{
if ($newHeight < $newWidth) {
$optimalWidth = $newWidth;
$optimalHeight= $this->getSizeByFixedWidth($newWidth);
} else if ($newHeight > $newWidth) {
$optimalWidth = $this->getSizeByFixedHeight($newHeight);
$optimalHeight= $newHeight;
} else {
// *** Sqaure being resized to a square
$optimalWidth = $newWidth;
$optimalHeight= $newHeight;
}
}
return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
}
private function getOptimalCrop($newWidth, $newHeight)
{
$heightRatio = $this->height / $newHeight;
$widthRatio = $this->width / $newWidth;
if ($heightRatio < $widthRatio) {
$optimalRatio = $heightRatio;
} else {
$optimalRatio = $widthRatio;
}
$optimalHeight = $this->height / $optimalRatio;
$optimalWidth = $this->width / $optimalRatio;
return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
}
private function crop($optimalWidth, $optimalHeight, $newWidth, $newHeight)
{
// *** Find center - this will be used for the crop
$cropStartX = ( $optimalWidth / 2) - ( $newWidth /2 );
$cropStartY = ( $optimalHeight/ 2) - ( $newHeight/2 );
$crop = $this->imageResized;
//imagedestroy($this->imageResized);
// *** Now crop from center to exact requested size
$this->imageResized = imagecreatetruecolor($newWidth , $newHeight);
imagealphablending($this->imageResized, false);
imagesavealpha($this->imageResized, true);
imagecopyresampled($this->imageResized, $crop , 0, 0, $cropStartX, $cropStartY, $newWidth, $newHeight , $newWidth, $newHeight);
}
}