Building a Browser-Based PDF Watermark Tool with pdf-lib and QPDF

The code you've provided is a JavaScript function that converts text into an image, which can then be used to create a PDF document with consistent and reliable text rendering across different platforms and devices. This approach is particularly useful for handling complex or non-standard fonts, as well as ensuring that the final PDF file size remains small.

Here's a breakdown of how this works:

1. Text-to-Image Conversion:

   • The function createPDF takes several parameters including text content (textContent), font family (fontFamily), and other styling options like color, background color, padding, etc.
   • It creates an HTML canvas element to draw the text on using a 2D rendering context.

2. Canvas Drawing:

   • The function sets up the canvas dimensions based on the provided width and height or calculates them dynamically if not specified.
   • Text is drawn onto the canvas with the specified font, color, background, padding, etc.
   • If autoWrap is true, it automatically wraps text to fit within a maximum width.

3. Image Conversion:

   • Once the text is rendered on the canvas, the function converts the canvas content into an image (PNG format).
   • This

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