clouddesk/include/functions_thumb.php

<?php

/*===============================================*\
|| ############################################# ||
|| # JAKWEB.CH / Version 2.1.2                 # ||
|| # ----------------------------------------- # ||
|| # Copyright 2023 JAKWEB All Rights Reserved # ||
|| ############################################# ||
\*===============================================*/
 
//    Unsharp Mask for PHP - version 2.1.1   
//   
//    Unsharp mask algorithm by Torstein Hønsi 2003-07.   
//    thoensi_at_netcom_dot_no.

function Image_Sharpen($img, $amount, $radius, $threshold) {
  if ($amount > 500) { $amount = 500; }
  $amount = $amount * 0.016;
  if ($radius > 50) { $radius = 50; }
  $radius = $radius * 2;
  if ($threshold > 255) { $threshold = 255; }

  $radius = abs(round($radius));
  if ($radius == 0) { return $img; imagedestroy($img); }

  $w = imagesx($img); $h = imagesy($img);
  $imgCanvas = imagecreatetruecolor($w, $h);
  $imgBlur = imagecreatetruecolor($w, $h);

  if (function_exists('imageconvolution')) {
    $matrix = array(
      array( 1, 2, 1 ),
      array( 2, 4, 2 ),
      array( 1, 2, 1 )
    );
    imagecopy($imgBlur, $img, 0, 0, 0, 0, $w, $h);
    imageconvolution($imgBlur, $matrix, 16, 0);
  } else {
    for ($i = 0; $i < $radius; $i++)    { 
      imagecopy($imgBlur, $img, 0, 0, 1, 0, $w - 1, $h);
      imagecopymerge($imgBlur, $img, 1, 0, 0, 0, $w, $h, 50);
      imagecopymerge($imgBlur, $img, 0, 0, 0, 0, $w, $h, 50);
      imagecopy($imgCanvas, $imgBlur, 0, 0, 0, 0, $w, $h); 

      imagecopymerge($imgBlur, $imgCanvas, 0, 0, 0, 1, $w, $h - 1, 33.33333 );
      imagecopymerge($imgBlur, $imgCanvas, 0, 1, 0, 0, $w, $h, 25);
    }
  }

  if($threshold>0) {
    for ($x = 0; $x < $w-1; $x++) {
      for ($y = 0; $y < $h; $y++) {

        $rgbOrig = ImageColorAt($img, $x, $y);
        $rOrig = (($rgbOrig >> 16) & 0xFF);
        $gOrig = (($rgbOrig >> 8) & 0xFF);
        $bOrig = ($rgbOrig & 0xFF);

        $rgbBlur = ImageColorAt($imgBlur, $x, $y);

        $rBlur = (($rgbBlur >> 16) & 0xFF);
        $gBlur = (($rgbBlur >> 8) & 0xFF);
        $bBlur = ($rgbBlur & 0xFF);

        $rNew = (abs($rOrig - $rBlur) >= $threshold)
          ? max(0, min(255, ($amount * ($rOrig - $rBlur)) + $rOrig))
          : $rOrig;
        $gNew = (abs($gOrig - $gBlur) >= $threshold)
          ? max(0, min(255, ($amount * ($gOrig - $gBlur)) + $gOrig))
          : $gOrig;
        $bNew = (abs($bOrig - $bBlur) >= $threshold)
          ? max(0, min(255, ($amount * ($bOrig - $bBlur)) + $bOrig))
          : $bOrig;

        if (($rOrig != $rNew) || ($gOrig != $gNew) || ($bOrig != $bNew)) {
          $pixCol = ImageColorAllocate($img, intval($rNew), intval($gNew), intval($bNew));
          ImageSetPixel($img, $x, $y, $pixCol);
        }
      }
    }
  }
  else {
    for ($x = 0; $x < $w; $x++) {
      for ($y = 0; $y < $h; $y++) {
        $rgbOrig = ImageColorAt($img, $x, $y);
        $rOrig = (($rgbOrig >> 16) & 0xFF);
        $gOrig = (($rgbOrig >> 8) & 0xFF);
        $bOrig = ($rgbOrig & 0xFF);

        $rgbBlur = ImageColorAt($imgBlur, $x, $y);

        $rBlur = (($rgbBlur >> 16) & 0xFF);
        $gBlur = (($rgbBlur >> 8) & 0xFF);
        $bBlur = ($rgbBlur & 0xFF);

        $rNew = ($amount * ($rOrig - $rBlur)) + $rOrig;
        
        if($rNew > 255) { $rNew = 255; }
        else if($rNew < 0) { $rNew = 0; }
        
        $gNew = ($amount * ($gOrig - $gBlur)) + $gOrig; 
        
        if($gNew > 255) {$gNew = 255;}
        else if($gNew < 0) { $gNew = 0; }
        
        $bNew = ($amount * ($bOrig - $bBlur)) + $bOrig; 

        if( $bNew > 255) { $bNew = 255; }
        else if ( $bNew < 0 ) { $bNew = 0; }

        $rgbNew = ($rNew << 16) + ($gNew <<8) + $bNew; 
        ImageSetPixel($img, $x, $y, $rgbNew); 
      }
    }
  }
  imagedestroy($imgCanvas);
  imagedestroy($imgBlur);

  return $img;
}

function create_thumbnail($targetPath, $targetFile, $sourceFile, $widthNew, $heightNew, $qualityNew)

{

$imgsize = getimagesize($targetFile);
switch(strtolower(substr($targetFile, -3))){
    case "jpg":
        $image = imagecreatefromjpeg($targetFile);    
    break;
    case "png":
        $image = imagecreatefrompng($targetFile);
    break;
    case "gif":
        $image = imagecreatefromgif($targetFile);
    break;
    default:
        exit;
    break;
}

$width = $widthNew; // New width of image    
$height = $heightNew; // New height of image

// Original size
$src_w = $imgsize[0];
$src_h = $imgsize[1];

// Create new size
if ($widthNew && ($src_w < $src_h)) {
    $width = ($heightNew / $src_h) * $src_w;
} else {
    $height = ($widthNew / $src_w) * $src_h;
}

$picture = imagecreatetruecolor($width, $height);
imagealphablending($picture, false);
imagesavealpha($picture, true);
$bool = imagecopyresampled($picture, $image, 0, 0, 0, 0, $width, $height, $src_w, $src_h);

// Sharpen Image
$picture = Image_Sharpen($picture, 80, 0.5, 3);

if($bool){
    switch(strtolower(substr($targetFile, -3))){
        case "jpg":
            $bool2 = imagejpeg($picture,$targetPath."/".$sourceFile,$qualityNew);
        break;
        case "png":
            imagepng($picture,$targetPath."/".$sourceFile);
        break;
        case "gif":
            imagegif($picture,$targetPath."/".$sourceFile);
        break;
    }
}

imagedestroy($picture);
imagedestroy($image);

}
?>