1060856 - Avoid producing singular matrices in nsLayoutUtils::ComputeSnappedImageDrawingParameters

Status: NEW

(Core :: Layout: Images, Video, and HTML Frames, defect)

Description

[Seth Fowler [:seth] [:s2h]]

We should fix issues 1 and 2 mentioned in bug 1053934 comment 19. (Pretty sure issue 3 can't happen.) Here's that comment again:

The only possibilities I can see for producing a singular matrix in ComputeSnappedImageDrawingParameters are:

1. The final fill we use (|fill|) has zero size.
2. The final dest rect we use (|anchoredDestRect|) has zero size.
3. The current matrix on the gfxContext was already singular before we started. Presumably that's not possible, though.

The first two possibilities would result in a matrix with all zeros, excluding the translation components.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The bug assignee didn't login in Bugzilla in the last 7 months, so the assignee is being reset.