tree c7598ab63cf4885bfa9560a29baf359f29b8195c
parent 85c165b459a47d3d383357c4a460d337f3d3d892
author Leon Scroggins III <scroggo@google.com> 1606853039 -0500
committer Leon Scroggins <scroggo@google.com> 1606940915 +0000

Ensure frame rect is on screen or empty

Bug: b/160984428

There is no reason for a client to need to know that the frame rect
extends beyond the edge of the "canvas"/"screen"/image bounds. A typical
use case is more interested in knowing what part of the original bounds
the frame update occupies.

If the offsets are beyond the image bounds, move them to the
right/bottom edge of the image (and make the width/height 0). This
matches Wuffs.

Change-Id: I215b312b421a30bf985f681424a4c4198f069862
Reviewed-on: https://skia-review.googlesource.com/c/libgifcodec/+/339831
Commit-Queue: Leon Scroggins <scroggo@google.com>
Commit-Queue: Derek Sollenberger <djsollen@google.com>
Auto-Submit: Leon Scroggins <scroggo@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>