Error: no such operation text

[musistudio]

When I use vips.Image.text to create text image,something wrong happend

const vips = await Vips();
const image = vips.Image.text("test");

Run this code,I got blow errors:

Error: no such operation text
VipsOperation: class "text" not found

I'm not sure if this is a bug, I only want to add some font watermask to my picture.Do you have a better way?

[kleisauke]

wasm-vips doesn't currently support text rendering via vips.Image.text, since it's dependent on Pango, which brings in a lot of sub-dependencies that needs to be compiled for WebAssembly:

• Cairo for text handling and graphics rendering;
  • Pixman for pixel manipulation;
• FontConfig for font discovery;
• FreeType for font access;
• HarfBuzz for complex text shaping;
• fribidi for bidirectional text handling.

For the same reason, SVG support via librsvg is currently not supported either, as mentioned in #4 (comment). For now, I can recommend using a pre-generated watermark, see for example the watermark sample on the playground.

[kleisauke]

@ricardo85x There are no plans to support PDF files. In short, this is due to that Poppler is GPL-licensed and PDFium uses an unusual build system.

Please open a new issue for that if you want more details on this.