image_auto_rotate is very slow

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Re: image_auto_rotate is very slow new!
by Dominik, 1 year, 9 months ago
Hi Colin,

I have some update for you.
Haven't heard of you for a long time, so I did some code changes myself regarding the veeeery slow image_auto_rotate and auto_flip functions. (In fact sadly these aren't real functions but simple if-statements, if these would have been functions/methods I could have easily extended your class and create overrides methods...)

Here is the code I changed:
In your $auto_flip statement you need to replace this (Old):

for ($x = 0; $x < $this->image_src_x; $x++) {
    for ($y = 0; $y < $this->image_src_y; $y++){
        if (strpos($auto_flip, 'v') !== false) {
            imagecopy($tmp, $image_dst, $this->image_src_x - $x - 1, $y, $x, $y, 1, 1);
        } else {
            imagecopy($tmp, $image_dst, $x, $this->image_src_y - $y - 1, $x, $y, 1, 1);
        }
    }
}

with this (New):

// Copy the image
imagecopy($tmp, $image_dst, 0, 0, 0, 0, $this->image_src_x, $this->image_src_y);

// Flip the image
if (!imageflip($tmp, ($auto_flip == 'h' ? IMG_FLIP_HORIZONTAL : IMG_FLIP_VERTICAL)))
{
    throw new \LogicException('Unable to flip the image.');
}


And in your $auto_rotate statement you need to replace this (Old):

if ($auto_rotate == 90 || $auto_rotate == 270) {
    $tmp = $this->imagecreatenew($this->image_src_y, $this->image_src_x);
} else {
    $tmp = $this->imagecreatenew($this->image_src_x, $this->image_src_y);
}
$this->log .= '- auto-rotate image : ' . $auto_rotate . '';
for ($x = 0; $x < $this->image_src_x; $x++) {
    for ($y = 0; $y < $this->image_src_y; $y++){
        if ($auto_rotate == 90) {
            imagecopy($tmp, $image_dst, $y, $x, $x, $this->image_src_y - $y - 1, 1, 1);
        } else if ($auto_rotate == 180) {
            imagecopy($tmp, $image_dst, $x, $y, $this->image_src_x - $x - 1, $this->image_src_y - $y - 1, 1, 1);
        } else if ($auto_rotate == 270) {
            imagecopy($tmp, $image_dst, $y, $x, $this->image_src_x - $x - 1, $y, 1, 1);
        } else {
            imagecopy($tmp, $image_dst, $x, $y, $x, $y, 1, 1);
        }
    }
}

with this (New):

$tmp = $this->imagecreatenew($this->image_src_x, $this->image_src_y);
$this->log .= '- auto-rotate image : ' . $auto_rotate . '';

// Copy the image
imagecopy($tmp, $image_dst, 0, 0, 0, 0, $this->image_src_x, $this->image_src_y);

// Rotate the image
$tmp = imagerotate($tmp, $auto_rotate, 0);


To make it rotate the images correctly you also have to change your exif-orientation cases to this (New):

switch($orientation) {
  case 1:
    $this->log .= '- EXIF orientation = 1 : default';
    break;
  case 2:
    $auto_flip = 'h';
    $this->log .= '- EXIF orientation = 2 : horizontal flip';
    break;
  case 3:
    $auto_rotate = 180;
    $this->log .= '- EXIF orientation = 3 : 180 rotate';
    break;
  case 4:
    $auto_flip = 'h';
    $auto_rotate = 180;
    $this->log .= '- EXIF orientation = 4 : horizontal flip + 180 rotate';
    break;
  case 5:
    $auto_flip = 'h';
    $auto_rotate = 90;
    $this->log .= '- EXIF orientation = 5 : horizontal flip + 90 rotate left';
    break;
  case 6:
    $auto_rotate = 270;
    $this->log .= '- EXIF orientation = 6 : 270 rotate left';
    break;
  case 7:
    $auto_flip = 'h';
    $auto_rotate = 270;
    $this->log .= '- EXIF orientation = 7 : horizontal flip + 270 rotate left';
    break;
  case 8:
    $auto_rotate = 90;
    $this->log .= '- EXIF orientation = 8 : 90 rotate left';
    break;
  default:
    $this->log .= '- EXIF orientation = '.$orientation.' : unknown';
    break;
}

Hope you can use it!
This will make the uploadtimes with image-rotation a lot faster!Reply
Re: image_auto_rotate is very slow new!
by colin, 1 year, 9 months ago
Thank you very much. Tbh, I have no spre time right now to implement and test it, but I have written down your code, and will try to integrate it as soon as possible.Reply