tree 5d93adb329b73ebeb82bd75dd3213fa0b4e15df1
parent bb4ce2fc943032cbcf6148a6837fdcb3a1ea2b1e
author Hui Yingst <nigi@chromium.org> 1573583316 +0000
committer Chromium commit bot <commit-bot@chromium.org> 1573583316 +0000

Fix rendering issue regarding Type2 CIDFont with illegal CIDToCIDMap.

The PDF Reference, Sixth Edition, specifies that a CIDToGIDMap "may
appear only in a Type 2 CIDFont whose associated True Type font
program is embedded in the PDF file"(Section 5.6, pp 437), which
makes the CIDToGIDMaps illegal. Some PDFs use Type2 CIDFont which is
not embedded and contains stream object as CIDToGIDMap.

This CL modifies the steps of converting CIDs into unicodes.
In CPDF_CIDFont::GlyphFromCharCode(), no matter if |m_pStreamAcc|
exists or not, try to convert by using |m_pCID2UnicodeMap| first. If
|m_pCID2UnicodeMap| is not available while |m_pStreamAcc| is, then
use the |m_pCID2UnicodeMap| data to convert CIDs into unicodes.

Bug: pdfium:1308
Change-Id: I6cc145711b83d60ebc5f3451a3ef629de8750056
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/61050
Commit-Queue: Hui Yingst <nigi@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>