Jonas Jenwald 3e550f392a Add PDF_TO_CSS_UNITS to the PixelsPerInch-structure
Rather than re-computing this value in a number of different places throughout the code-base[1], we can expose this in the API via the existing `PixelsPerInch`-structure instead.
There's also been feature requests asking for the old `CSS_UNITS` viewer constant to be made accessible, such that it could be used in third-party implementations.

I suppose that it could be argued that it's somewhat confusing to place a unitless property in `PixelsPerInch`, however given that the `PDF_TO_CSS_UNITS`-property is defined strictly in terms of the existing properties this is hopefully deemed reasonable.

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[1] These include:
 - The viewer, with the `CSS_UNITS` name.
 - The reference-tests.
 - The display-layer, when rendering images; see PR 13991.
2021-09-20 13:20:09 +02:00
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2013-03-15 11:24:08 -07:00