We do indeed generate vector PDFs, not embedded bitmaps. Our graphics engine works with Canvas API instructions — like "draw a line from point (A,B) to (C,D)."

We do indeed generate vector PDFs, not embedded bitmaps. Our graphics engine works with Canvas API instructions — like "draw a line from point (A,B) to (C,D)." This API is small enough and low-level enough that it can also generate pristine vector output. That's in fact one of the features of Skia Canvas (vector output in PDF and SVG).