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Add PDF_TO_CSS_UNITS to the PixelsPerInch-structure

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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.

---
[1] These include:
 - The viewer, with the `CSS_UNITS` name.
 - The reference-tests.
 - The display-layer, when rendering images; see PR 13991.
This commit is contained in:
Jonas Jenwald 2021-09-20 10:10:57 +02:00
parent 580bfad628
commit 3e550f392a
7 changed files with 38 additions and 22 deletions
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4
web/ui_utils.js
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@ -13,9 +13,6 @@
* limitations under the License.
*/
import { PixelsPerInch } from "pdfjs-lib";
const CSS_UNITS = PixelsPerInch.CSS / PixelsPerInch.PDF;
const DEFAULT_SCALE_VALUE = "auto";
const DEFAULT_SCALE = 1.0;
const DEFAULT_SCALE_DELTA = 1.1;
@ -1004,7 +1001,6 @@ export {
AutoPrintRegExp,
backtrackBeforeAllVisibleElements, // only exported for testing
binarySearchFirstItem,
CSS_UNITS,
DEFAULT_SCALE,
DEFAULT_SCALE_DELTA,
DEFAULT_SCALE_VALUE,