fix(deps): update module github.com/go-pdfkit/ops to v0.8.0

[tannevaled]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/go-pdfkit/ops	v0.7.2 → v0.8.0

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Release Notes

go-pdfkit/ops (github.com/go-pdfkit/ops)

v0.8.0: — a page made of a picture

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Doc.Picture makes a page of an image: the other half of drawing a page. A scanner, a camera and a screenshot all produce a picture, and what people want of a PDF toolkit is to be handed one back with the picture in it.

It takes every format go-gfx/gfx reads, which is more than a PDF can carry. A JPEG goes in as it stands — a PDF carries JPEG, and re-encoding one loses a little of it for nothing; everything else is decoded and written as compressed samples.

Transparency becomes a soft mask. Dropping the alpha channel instead puts the colour that was under the transparency on the page, so a PNG with a clear background comes out with black behind it.

dpi says how many of the image's pixels go into an inch of paper: a photograph from a telephone at 72 is a page the size of a wall, and at 300 it is a photograph.

A picture of no size is refused, and writing that test found the hole it closes: GIF, BMP and JPEG all decode a zero-by-zero image without complaining — such a file is not malformed, it is empty — and the check was on the path that decodes rather than on the one that only measures.

Judged by poppler rather than by ourselves: it reads the files, lists the picture at the right size, carries the JPEG as jpeg, and renders the halves the right way round, the transparent half over white.

100% statement coverage, go vet and -race clean, nine cross-compile targets, CGO-free.

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