VipsDriver slow when using ->drawPixel

[Yihka]

Hello,

I'm drawing a map based on some map data of a game, which is 128x128. So I draw each pixel individually. I read that libvips is supposed to be lightning fast, but I see when using the ->drawPixel() it's more than 20x as slow than gd or imagick.

When I draw a 256x256, gd takes about 5 seconds, this is with some other algorithms in place. For Vips we're talking about minutes.

Would love to have a superfast pixel drawing thing though!

[Yihka]

I've made a script to test with

        $width = 256;
        $height = 256;

        // Initialize the image canvas
        $manager = new ImageManager(\Intervention\Image\Drivers\Vips\Driver::class);
        $image = $manager->create($width, $height);
        for ($y = 0; $y < $width; $y++) {
            for ($x = 0; $x < $height; $x++) {
                $image->drawPixel($x, $y, '#000000'); // Fill with black
            }
        }

GD takes about 1.10 seconds
Vips takes 58 seconds

I run php 8.3
I have VIPS 8.12.1
intervention/image-driver-vips 1.0.4

[olivervogel]

I suspect this has to do with the fact that this library internally creates a new vips image for each pixel and inserts it into the canvas image. This is the intention of the drawPixel() function.

I could imagine that there are ways in Vips itself to do this more efficiently in a single step for all pixels. Not sure about that though.