tree 139229af10822a2d17a464ac1b3d3ac06b87b02c
parent 9d3833367f5f0ae4d5644bf5d66ebba567c2161e
author Tom Sepez <tsepez@chromium.org> 1564074840 +0000
committer Chromium commit bot <commit-bot@chromium.org> 1564074840 +0000

Weakly cache CPDF_Type3Cache in CPDF_DocRenderData.

Typical Retainable/Observable pattern.

In order to keep fonts alive, let CPDF_Type3Cache directly manage
CPDF_CountedFont refcounts. Currently, this is being performed by
CPDF_RenderStatus outside the class with the use of something called
CPDF_RefType3Cache, which provides still yet another refcount.
This works because CPDF_RenderStatus::GetCachedType3() is the only
place a CPDF_Type3Cache might get created (and as a side-effect
introduces another unowned pointer into a font managed elsewhere
by a counted font object).

Ideally, CPDF_Font would be a Retainable, but there are circular
references to be resolved first. In the mean time, this makes things
a little cleaner.

Change-Id: I710815fe44bb0506fd8e35ae6dbe44517c171ba1
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/58110
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>