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#13 2024-02-17 02:26:49

kuopassa
Plugin Author
From: Porvoo, Finland
Registered: 2008-12-03
Posts: 231
Website

Re: Convert images to .webp

Thanks to phiw13, the kuo_webp plugin is now available as a .zip package. I got that with the Textpattern 4.9-dev export tool. :-)

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#14 2024-02-17 04:49:27

Myusername
Member
Registered: 2019-12-12
Posts: 162

Re: Convert images to .webp

Knowing which hooks to use seems easy to do this:

register_callback('convert_to_webp', 'image_uploaded', 'image');
register_callback('delete_image', 'image_deleted', 'image');

function convert_to_webp($evt, $stp, $id = '')
{
    $image = safe_row(
      '*',
      'txp_image',
      "id = '$id'",
      false
    );

    // Base path where images are stored
    $basePath = IMPATH;

    // File extension of the image
    $fileExtension = $image['ext'];

    // Constructs the full path of the original image
    $originalImagePath = $basePath . $id . $fileExtension;

    // Checks if the image exists
    if (!file_exists($originalImagePath)) {
        return;
    }

    // Depending on the file extension, loads the image
    switch ($fileExtension) {
        case '.jpg':
        case '.jpeg':
            $image = imagecreatefromjpeg($originalImagePath);
            break;
        case '.png':
            $image = imagecreatefrompng($originalImagePath);
            break;
        default:
            echo "File format not supported.";
            return;
    }

    // Path where the WebP converted image will be saved
    $webpImagePath = $basePath . $id . '.webp';

    // Converts and saves the image as WebP
    $result = imagewebp($image, $webpImagePath);

    imagedestroy($image);
}

function delete_image($evt, $stp, $id = '')
{
    $basePath = IMPATH;

    $webpImagePath = $basePath . $id . '.webp';

    // Checks if the WebP version of the image exists
    if (file_exists($webpImagePath)) {
        // Attempts to remove the WebP image
        if (unlink($webpImagePath)) {
          return "The WebP image was successfully removed.";
        } else {
          return "There was an error trying to remove the WebP image.";
        }
    } else {
      return "The WebP image does not exist or has already been removed.";
    }
}

In this way, we have {id}.jpg and {id}.webp. Simple, but it seems functional. I didn’t think about how the webp image would be accessed on the frontend, but it has the same URL, what changes is just the image extension, so it shouldn’t be a problem. However, the problem seems to be about the thumbnails, since looking at the URL that Jakob mentioned, I didn’t find any hook that is triggered when creating a thumbnail, only when the thumbnail is deleted. The same logic should work, and we would have {id}t.jpg and {id}t.webp.

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#15 2024-02-17 22:11:14

jakob
Admin
From: Germany
Registered: 2005-01-20
Posts: 4,633
Website

Re: Convert images to .webp

Bloke wrote #336678:

That is indeed a good workaround for now. I like that idea, albeit loading the web server with work, which means we’d need to maintain Nginx and others somehow. I’d still prefer a core solution one day. One day…

phiw13 wrote #336690:

Interesting… If I understand it correctly, this checks (1) if the browser supports .webp, then (2) checks if there is an image in that format for with the same name as the requested .jpg and then (3) replace the latter with the former. Hmm, is it not a little wasteful? the action would happen on every image request…

Yes, the author does caution that it add server load and is more responsibly solved using the source tag or similar.

And an nginx equivalent would be great.

kuopassa wrote #336691:

Thanks to phiw13, the kuo_webp plugin is now available as a .zip package. I got that with the Textpattern 4.9-dev export tool. :-)

Cool, thank you! (BTW: there’s now this command-line too which will make a txt-installer from the /textpattern/plugins/plugin_name folder).

Myusername wrote #336692:

Simple, but it seems functional. I didn’t think about how the webp image would be accessed on the frontend, but it has the same URL, what changes is just the image extension, so it shouldn’t be a problem. However, the problem seems to be about the thumbnails, since looking at the URL that Jakob mentioned, I didn’t find any hook that is triggered when creating a thumbnail, only when the thumbnail is deleted. The same logic should work, and we would have {id}t.jpg and {id}t.webp.

Also cool! This was more along the lines of what I was thinking.

You’re right, there’s not a thumbnail_uploaded callback, but in your convert_to_webp{…} function, which is run when the image_uploaded callback is triggered, you could always check if there are values for $image['thumb_w'] and/or $image['thumb_h'], and if so resize your image accordingly and create a corresponding webp file with a t in the filename.

The only situation that’s then not covered is the exclusive creation of a thumbnail independently of the main image.

Might this last situation be addressed by adding a corresponding callback just after this line ?


TXP Builders – finely-crafted code, design and txp

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#16 2024-02-18 03:31:50

bici
Member
From: vancouver
Registered: 2004-02-24
Posts: 2,077
Website Mastodon

Re: Convert images to .webp

whoa!
Parse error: syntax error, unexpected ‘IjtzOjEwOiJhdXRob3JfdXJpIjtzOj’ (T_STRING) in /home/bici/apps/bicilogic_app/textpattern/plugins/kuo_webp_v0.1/kuo_webp_v0.1.php on line 16

I managed to login and delete plugin. !


…. texted postive

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#17 2024-02-18 04:53:05

Pat64
Plugin Author
From: France
Registered: 2005-12-12
Posts: 1,615
GitHub Twitter

Re: Convert images to .webp

Hi Petri.

I’m very interested in your kuo_webp plugin. I definitively adopted the webp images format.

Unfortunately, I can’t get any webp copies from my images (png or jpg) when I click on the floppy disc icon. There are no \webp folder on my server.


Patrick.

Github | CodePen | Codier | Simplr theme | Wait Me: a maintenance theme | [\a mi.ni.ma]: a “Low Tech” simple Blog theme.

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#18 2024-02-18 06:41:47

jakob
Admin
From: Germany
Registered: 2005-01-20
Posts: 4,633
Website

Re: Convert images to .webp

bici wrote #336696:

Parse error: syntax error, unexpected ‘IjtzOjEwOiJhdXRob3JfdXJpIjtzOj’ (T_STRING) in /home/bici/apps/bicilogic_app/textpattern/plugins/kuo_webp_v0.1/kuo_webp_v0.1.php on line 16

bici, you have the kuo_webp_v0.1.php as well as the kuo_webp.php in your /textpattern/plugins/kuo_webp/ folder and that’s causing the problem. Just remove kuo_webp_v0.1.php from inside that folder so you are left with:

/kuo_webp
    manifest.json
    kuo_webp.php
    help.textile

and it should work again (pending comments in next post).

If you are reinstalling, you can either

  • visit “Pete’s GitHub page”.
  • Click on “Download raw file” button – the icon next to “raw” at the top of the code block.
  • Visit Admin › Plugins on your textpattern site and click the “Upload” button next to “Upload plugin”.
  • Select the php file you just downloaded.

Or, use this txt-installer (this includes the fix I made in the next post) – see below for a v0.02 update.

# kuo_webp v0.1
# Create WebP versions of images.
# Pete
# https://textpattern.fi/

# ----------------------------------------------------------------------------
# This is a plugin for Textpattern built using ais_txpplugin_packager.php
# To install: textpattern > admin > plugins
# Paste the following text into the 'Install plugin' box:
# ----------------------------------------------------------------------------

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#19 2024-02-18 06:47:05

jakob
Admin
From: Germany
Registered: 2005-01-20
Posts: 4,633
Website

Re: Convert images to .webp

Pat64 wrote #336697:

Unfortunately, I can’t get any webp copies from my images (png or jpg) when I click on the floppy disc icon. There are no \webp folder on my server.

The plugin doesn’t create a \webp subfolder, it just creates the files alongside the existing image files.

However, I initially also couldn’t get it to work on PHP 8+, I tracked down the problem to this check where is_resource() is giving me no response and hindering the creation of the webp files.

Apparently the check for GD image has changed since PHP 8, so this resolved it for me:

        if (
                (isset($image))
                &&
                (is_resource($image) || $image instanceof \GdImage))
        ) {

Now the image creation works for me. See the post above for a txt-installer with this fix included.


TXP Builders – finely-crafted code, design and txp

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#20 2024-02-18 07:52:16

Pat64
Plugin Author
From: France
Registered: 2005-12-12
Posts: 1,615
GitHub Twitter

Re: Convert images to .webp

It’s perfect! 👌

Thank you very much, Petri and Jacob. 👏

(Okay: the plugin creates a link to display a copy of the current image in webp format, from a new icon)


Patrick.

Github | CodePen | Codier | Simplr theme | Wait Me: a maintenance theme | [\a mi.ni.ma]: a “Low Tech” simple Blog theme.

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#21 2024-02-18 09:19:05

phiw13
Plugin Author
From: Japan
Registered: 2004-02-27
Posts: 3,106
Website

Re: Convert images to .webp

Ok, yeah, after reinstalling the plugin with Jakobs fixes (using the txt installer above, that kinda work: a .webp image is created along with a thumbnail. The quality is OK.

The issue though, as with much of GD generated images is file size: the original .jpg 1000×750px mildly optimised urban landscape is 208kb on disc. The generated .webp balloons to 455kb. Doing the conversion with Acorn image editor (File > Export, webp quality slider to 75%) yields a more reasonable 175kb.


Where is that emoji for a solar powered submarine when you need it ?
Sand space – admin theme for Textpattern

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#22 2024-02-18 10:25:56

jakob
Admin
From: Germany
Registered: 2005-01-20
Posts: 4,633
Website

Re: Convert images to .webp

phiw13 wrote #336701:

The issue though, as with much of GD generated images is file size: the original .jpg 1000×750px mildly optimised urban landscape is 208kb on disc. The generated .webp balloons to 455kb. Doing the conversion with Acorn image editor (File > Export, webp quality slider to 75%) yields a more reasonable 175kb.

That’s probably because it’s currently set to generate webp images at 100% quality – see this line and imagewebp on php.net. Play with that value to get better results.


TXP Builders – finely-crafted code, design and txp

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#23 2024-02-18 12:55:36

jakob
Admin
From: Germany
Registered: 2005-01-20
Posts: 4,633
Website

Re: Convert images to .webp

jakob wrote #336702:

That’s probably because it’s currently set to generate webp images at 100% quality – see this line and imagewebp on php.net. Play with that value to get better results.

phiw13 wrote #336689:

based on your screengrab only, might it not be better inserting your widget after the main image – and just before the thumbnail generating area?

Here’s a mini-update to the earlier version with one UI modification and two additions:

  • Positioning of the button to generate the image and links to the corresponding images show in the sidebar above the “save”, “delete” and “go back” buttons. (Philippe, there’s not a good placement between the main image and the thumbnail, and the other placements cause one to have replace a piece of the UI).
  • A prefs setting under Admin › Preferences › WebP settings for setting a user-defined quality setting. The default is 80.
  • Textpack strings in English, German and French. Improvements/corrections welcome.

myusername’s variant is still desirable as this is more a proof of concept for creating webp images on a one-by-one basis. Ideally you’d want a generic setting that creates them as a rule as part of the image_save routine. A bulk conversion for existing sites would also be good.

# kuo_webp v0.2
# Create WebP versions of images.
# Pete
# https://textpattern.fi/

# ----------------------------------------------------------------------------
# This is a plugin for Textpattern built using ais_txpplugin_packager.php
# To install: textpattern > admin > plugins
# Paste the following text into the 'Install plugin' box:
# ----------------------------------------------------------------------------

H4sIAAAAAAAAE9VazXLbOBK+6ykQxhVKLlnyT3488iiTbCrJuiqT8aa8k0PWxYJIkMKEIjkEaMfJuG
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yaOSQAAA==

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#24 2024-02-19 05:41:57

phiw13
Plugin Author
From: Japan
Registered: 2004-02-27
Posts: 3,106
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Re: Convert images to .webp

jakob wrote #336702:

That’s probably because it’s currently set to generate webp images at 100% quality

Thanks for that… I did not realise that the “best” quality was hard coded. Testing with a 75% setting yields something better – 200kb for the .webp vs 208kb for the .jpg and 175kb when generated with Acorn.


Where is that emoji for a solar powered submarine when you need it ?
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