tree e2ef255398815f763cb392f7cfed3a501f545ec0
parent c2da3ad9993bb1611691a18032a12306d0e378b3
author Hui Yingst <nigi@chromium.org> 1568648153 +0000
committer Chromium commit bot <commit-bot@chromium.org> 1568648153 +0000

[SkiaPaths] Avoid overlapping when drawing text.

SkiaPaths draws text according to each glyph's default font width
unless horizontal scale is specified. Sometimes a character's width
defined in the pdf file is smaller than the character's default font
width, which makes it overlap with other characters. Add a process to
scale each individual character by the ratio of its actual width in the
pdf file and its default font width to avoid overlapping.

When cache is enabled, sometimes text is not rendered even after its
CFX_RenderDevice is destroyed and its font becomes unavailable. To
guarantee a valid font before finishing drawing the text object, call
Flush() in CFDE_TextOut::DrawString() before CFX_RenderDevice structure
is released.

Bug: pdfium:1351
Change-Id: Ib693e5b1a9d94c7889a9285cd047c07f52c16085
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/60510
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>