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After the introduction of `OffscreenCanvas` support we now have *two separate* mask-methods in the `PDFImage` class, and the reason that they were not combined is likely that we need the "raw" bytes when parsing Type3-glyph image masks. However, that case is easy to support simply by disabling `OffscreenCanvas` usage when parsing Type3-glyphs and that way we're able to reduce some code duplication. Another slightly strange property of the `PDFImage.createMask` method is that it needs various image-dictionary parameters *manually* provided, which is probably because this is very old code. That feels slightly unwieldy, and we instead change the method to pass in the image-stream directly and do the necessary data-lookup internally. A side-effect of this re-factoring is that we now support using the custom `isSingleOpaquePixel` operator in Type3-glyphs, which shouldn't hurt even though it seems extremely unlikely for that to ever happen in Type3-glyphs.