diff options
Diffstat (limited to 'cc')
| -rw-r--r-- | cc/layers/picture_layer_impl.cc | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/cc/layers/picture_layer_impl.cc b/cc/layers/picture_layer_impl.cc index 88cf1fb..b476714 100644 --- a/cc/layers/picture_layer_impl.cc +++ b/cc/layers/picture_layer_impl.cc @@ -477,6 +477,21 @@ void PictureLayerImpl::UpdateViewportRectForTilePriorityInContentSpace() { visible_rect_in_content_space = gfx::ToEnclosingRect(MathUtil::ProjectClippedRect( view_to_layer, viewport_rect_for_tile_priority)); + + // We have to allow for a viewport that is outside of the layer bounds in + // order to compute tile priorities correctly for offscreen content that + // is going to make it on screen. However, we also have to limit the + // viewport since it can be very large due to screen_space_transforms. As + // a heuristic, we clip to bounds padded by skewport_extrapolation_limit * + // maximum tiling scale, since this should allow sufficient room for + // skewport calculations. + gfx::Rect padded_bounds(bounds()); + int padding_amount = layer_tree_impl() + ->settings() + .skewport_extrapolation_limit_in_content_pixels * + MaximumTilingContentsScale(); + padded_bounds.Inset(-padding_amount, -padding_amount); + visible_rect_in_content_space.Intersect(padded_bounds); } } viewport_rect_for_tile_priority_in_content_space_ = |