tree c6007b9477527d92d69dd50e6fa14d69c90b4658
parent f5ad5c1a3f33358cd8cb05f60e80fb076365d749
author Alan Screen <awscreen@chromium.org> 1568398032 +0000
committer Chromium commit bot <commit-bot@chromium.org> 1568398032 +0000

[FXCRT] Add double rounding support

Double precision rounding support is useful for improved accuracy by
the automatic conversion of decimal text entry (e.g., currency).

in crbug.com/611744 the Javascript parsing code converts a string from a
textbox into a single precision float.  That has enough floating point
error that input like "407.96" gets changed into "407.959991".

As noted in https://crbug.com/611744#c3, there is no code to dictate
forwarding, so any floating point error will show up.

Almost all the math in the Javascript code uses double except for that
one initial parse, which is float.  Once this CL is in then it will
facilitate using double for that too, and then "407.96" will still show
up as "407.96".

There are of course other input cases where numerical inaccuracies could
still arise, but at least with this it will ensure that Pdfium will behave
like other readers.

Bug: chromium:611744
Change-Id: Ie0fc97d4009c1c70a1ae170d8182cc6c84e7901a
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/60570
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>