Undefined constant "Intervention\Image\Drivers\Gd\Encoders\IMG_WEBP_LOSSLESS"

[kmuharam]

Describe the bug

Trying to process an uploaded image, I receive an exception:
Undefined constant "Intervention\Image\Drivers\Gd\Encoders\IMG_WEBP_LOSSLESS".

Please note, if I reduce the quality to 99 (or any number but 100) everything works fine.

This issue seems to be more related to intervention/image package.

Code Example

use Ramsey\Uuid\Uuid;
use Illuminate\Support\Facades\Storage;
use Intervention\Image\Laravel\Facades\Image;
use Illuminate\Http\JsonResponse;

class Service {
    // ...
    public function store(CreateRequest $request): JsonResponse
    {
        // ...
        $portraitImageName = Uuid::uuid4() . '.webp';
        $interventionPortraitImage = Image::read($request->file("portrait_cover_image"));

        Storage::disk('s3')->put("/portal/blog/posts/images/{$portraitImageName}", $interventionPortraitImage->toWebp(100));
        // ...
    }
    // ...
}

Expected Behavior

Exploring file: intervention/image/src/Drivers/Gd/EncodersWebpEncoder.php:

    // ... Line 20
    $quality = $this->quality === 100 ? IMG_WEBP_LOSSLESS : $this->quality;
    // ... Line 22

The constant IMG_WEBP_LOSSLESS should be defined in appropriate file.

Environment (please complete the following information):

• PHP Version: 8.2
• OS: AlmaLinux 9.5
• Intervention Image Version: 1.3.0
• GD or Imagick: GD

[olivervogel]

It seems your GD extension does not support Webp format. You can check with:

function_exists('imagewebp');

[kmuharam]

Hello @olivervogel

Psy Shell v0.12.7 (PHP 8.2.25 — cli) by Justin Hileman
> function_exists('imagewebp');
= true

This extension and intervention both work perfectly if set any value other than 100.

[olivervogel]

Thats strange. IMG_WEBP_LOSSLESS is supported as of PHP 8.1.0 and is a predefined constant of GD library. If you have GD it should be there.

[kmuharam]

I have been playing around trying to figure this out, depending on the PHP docs:

GD

imagewebp() can now do lossless WebP encoding by passing IMG_WEBP_LOSSLESS as the quality.

This constant is only defined, if the used libgd supports lossless WebP encoding.

I have tried also to list all defined constants and did not find IMG_WEBP_LOSSLESS.

It seems like the existence of the constant depends on the libgd package provided by the OS / Repo and not always present.

[olivervogel]

Ok thanks. I actually didn't knew that the constant is only defined if libgd is compiled with support for lossless webp encoding.

The patch 4476d94 is already included and will be available in the next release.

[kmuharam]

Ok, thank you for this great package 💚.