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Hui Yingst d753dd3f23 Fix named destination "FitR" zooming in at the wrong region issue.
In the PDF viewer, the viewport uses goToPageAndXY() to navigate inside
the document, which takes in-screen coordinates as x and y input. The
parameters we get from FPDFDest_GetVieware() are directly from the named
destination, which uses the in-page coordinates.

However, these in-page coordinates are sent to the viewport for
navigation without getting transformed into in-screen coordinates, which
results in PDF viewer zooming in at the wrong region of the page for
FitR type named destination.

Since coordinate transformation is missing for all view fit types, this
CL adds a helper ParamsTransformPageToScreen() to handle the
transformation according to the view's fit type. (See Table 151 about
Destination syntax from PDF 32000-1:2008.)

Bug: 1136733
Change-Id: I811844260f2ea9b1a5244a178174691e85f2f96d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628492
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Hui Yingst <nigi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843710}
2021-01-14 20:37:44 +00:00
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