tree aa63c865d61bd55dbc576e9ee382a2cfae54be29
parent d30c5601bba6155d098cec730ac122ad155a8158
author Ian Prest <iapres@microsoft.com> 1569529998 +0000
committer Chromium commit bot <commit-bot@chromium.org> 1569529998 +0000

New API to retrieve a character's loose bounds

This change adds a new API `FPDFText_GetLooseCharBox` that retrieves the
"loose" bounds of a character.  I.e., the returned bounds will cover the
entire possible extent of the character (given its width).  The height
of the box will always be the same as the font size.  The width will
equal the entire "advance" of the character.

Compare with `FPDFText_GetCharBox`, which returns a "tight" box around
the actual curves that make up the glyph.

This API will be used to make the PDF a11y line-breaking heuristics
more reliable, so that, e.g., lines are treated the same way
(mathematically) even if they don't have any ascenders or descenders.

Change-Id: I2860f12865b6c81e90cb2621fd8adac1ab5f2530
Bug: chromium:985604
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/59971
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>