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Marc-André Bombeck
4b73099e75
Refs #1124. The rasterizer opened pdfjs without its standard font, CMap and wasm directories and told it to use system fonts. The runtime image has none, so any text pdfjs could not draw from an embedded program (a non-embedded standard font, or an embedded one it cannot parse) came out as nothing, and an image-only provider was sent the page background. A workstation hides this because its own fonts stand in. pdfjs now gets the directories from its own package, resolved at runtime from the working directory, and Liberation Sans from that package is registered as the canvas' sans-serif, serif and monospace faces for the text pdfjs draws with a substitute. A document whose every rendered page is blank now reports render-failed, so the read records raster-failed instead of indexing a transcript of an empty page as a success.