Google Play Market Image Downloader

function processImage(originalImg, assetType = "Feature Graphic (1024x500)", objectFit = "cover", backgroundColor = "#ffffff") {
    let width, height;
    
    // Determine target dimensions based on Google Play Store asset specifications
    switch(assetType) {
        case "Icon (512x512)":
            width = 512;
            height = 512;
            break;
        case "Phone Screenshot (1080x1920)":
            width = 1080;
            height = 1920;
            break;
        case "7-inch Tablet Screenshot (1200x1920)":
            width = 1200;
            height = 1920;
            break;
        case "10-inch Tablet Screenshot (1536x2048)":
            width = 1536;
            height = 2048;
            break;
        case "Feature Graphic (1024x500)":
        default:
            width = 1024;
            height = 500;
            break;
    }

    const canvas = document.createElement("canvas");
    canvas.width = width;
    canvas.height = height;
    const ctx = canvas.getContext("2d");

    // Fill the background
    ctx.fillStyle = backgroundColor;
    ctx.fillRect(0, 0, width, height);

    // Calculate dimensions to maintain aspect ratio
    const imgRatio = originalImg.width / originalImg.height;
    const targetRatio = width / height;

    let drawWidth, drawHeight, x, y;

    if (objectFit === "contain") {
        if (imgRatio > targetRatio) {
            drawWidth = width;
            drawHeight = width / imgRatio;
        } else {
            drawHeight = height;
            drawWidth = height * imgRatio;
        }
    } else { 
        // Default to "cover"
        if (imgRatio > targetRatio) {
            drawHeight = height;
            drawWidth = height * imgRatio;
        } else {
            drawWidth = width;
            drawHeight = width / imgRatio;
        }
    }

    // Center the image on the canvas
    x = (width - drawWidth) / 2;
    y = (height - drawHeight) / 2;

    // Draw the original image optimally placed
    ctx.drawImage(originalImg, x, y, drawWidth, drawHeight);

    return canvas;
}