Can you please document the extract_size_and_pixels_with_imagick function used in the example?

[uandco]

I guess it uses some kind of ImagickPixelIterator implementation but that makes the example very hard to use without that missing piece.

Thanks!

[SRWieZ]

Sort of, the goal is to simulate what getImageData javascript function returns.

Here is a commented version using ImagickPixelIterator, hope it help you understand 🙂
(not tested, but should work)

/**
 *
 * Extracts the size (width and height) and pixel data (RGBA) from an image using the Imagick library
 * and ImagickPixelIterator.
 * @param  string  $content  The binary data of the image to be processed.
 * @return array An array containing the width, height, and pixel data of the image.
 * @throws \ImagickPixelIteratorException
 */
function extract_size_and_pixels_with_imagick_pixel_iterator($content): array
{
    // Create a new Imagick object and read the image from the binary data provided.
    $image = new Imagick();
    $image->readImageBlob($content);

    // Get the width and height of the image.
    $width = $image->getImageWidth();
    $height = $image->getImageHeight();

    // Create a new ImagickPixelIterator to iterate through the pixels of the image.
    $pixelIterator = $image->getPixelIterator();

    $pixels = [];

    // Loop through the rows of the image using the iterator.
    foreach ($pixelIterator as $row => $pixelRow) {
        // Loop through the pixels in the current row.
        foreach ($pixelRow as $column => $pixel) {
            // Get the RGBA color values of the pixel.
            $colors = $pixel->getColor(2);

            // Append the RGBA values to the pixels array.
            $pixels[] = $colors['r'];
            $pixels[] = $colors['g'];
            $pixels[] = $colors['b'];
            $pixels[] = $colors['a'];
        }
    }

    // Return an array containing the width, height, and pixel data.
    return [$width, $height, $pixels];
}

[uandco]

Thanks a lot, worked a charm!