Black bar on picture after resize, rotate and crop - php

Question

On a PWA, full legacy/handmade PHP/JS (jquery), i'm trying to avoid all the bug and problems with picture.
I've solved the famous bug where picture are 90° rotate
I've dicreased the weight with the "quality" parameter in imagejpeg
And i'm trying to resize it with no less than 800px for width and no more less 600px for height. Like, 810x750 it's okay for me, 1500x620 too, but no 500x450.
1 and 2 work fine. The third point is bit complicated it "crop" my picture with false position and there is this famous black bar on right.
I've read a lot of articles on it with sometimes solutions, but they are always "isolated" scripts, intended for the black bar. I want to solve my problem by keeping this big function which makes resize/rotate/decrease weight.
I don't want a copy/thumbnail, just the original with correct size.
Here's my code
function compressImage($source, $destination, $quality) {
error_log('====================');
error_log('Source : '.$source);
error_log('Destination : '.$destination);
error_log('Qualité : '.$quality);
$imgInfo = getimagesize($source);
$mime = $imgInfo['mime'];
// EXTRACT INFO
$newPic = imagecreatefromstring(file_get_contents($source));
$exif = exif_read_data($source);
$rotation = 0;
if(!empty($exif['Orientation'])) {
error_log('Orientation : '.$exif['Orientation']);
// CHECK IF PHP DID WRONG ROTATION
switch($exif['Orientation']) {
case 8:
$newPic = imagerotate($newPic, 90, 0);
break;
case 3:
$newPic = imagerotate($newPic, 180, 0);
break;
case 6:
$newPic = imagerotate($newPic, -90 ,0);
break;
}
$rotation = 1;
time_nanosleep(0, 500000000);
}
$w = 800;
$h = 600;
list($width, $height) = $imgInfo;
error_log('Actual width : '.$width);
error_log('Actual height : '.$height);
$r = $width / $height;
if($w/$h > $r) {
$newWidth = $h*$r;
$newHeight = $h;
} else {
$newHeight = $w/$r;
$newWidth = $w;
}
// CALCULATE NEW SIZE (MAYBE HERE FOR MISTAKE ?)
error_log('New width : '.$newWidth);
error_log('New height : '.$newHeight);
$thumb = imagecreatetruecolor($newWidth, $newHeight);
if($rotation == 1) {
error_log('2nd MIME : '.$mime);
switch($mime) {
case 'jpg':
error_log('JPG');
$newPic = imagejpeg($image, $destination, $quality);
break;
case 'jpeg':
error_log('JPEG');
$newPic = imagejpeg($image, $destination, $quality);
break;
}
time_nanosleep(0, 500000000);
}
imagecopyresized($thumb, $newPic, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
$newPic = imagejpeg($thumb, $destination, $quality);
move_uploaded_file($newPic, $destination);
}
Here's a complete example :
Randomly wanted 9000x12000 to be 800x600 but for example if someone sends a picture of 1685x1235 (random) i want 819x600. (if we took the width as a reference in this specific case instead it would not be good because we would have 800x586 (and therefore 586 < 600)
Edit : after two weeks of tests i can't afford what i want, thanks to everyone who have solution to resize, prevent rotate bug and crop in one script.