654fc7346e
- Introduce some new Layer classes. - Introduce paintChildWith* methods. - Convert paint() methods to use paintChildWith* where appropriate. - Fix paintBounds logic in Layer world. - Introduce Layer.replaceWith(), so that it's clearer what's going on. - Make RenderObjects have a ContainerLayer, not a PictureLayer. - Introduce a PaintingContext.replacingLayer() constructor to highlight where we are creating a layer just to replace an older one. - Rename some layer-related methods and fields for clarity: requiresCompositing -> hasLayer hasCompositedDescendant -> needsCompositing updateCompositing -> updateCompositingBits _needsCompositingUpdate -> _needsCompositingBitsUpdate markNeedsCompositingUpdate -> markNeedsCompositingBitsUpdate - After updating compositing bits, if we find that the bit changed, we now call markNeedsPaint(). - Reorder markNeedsPaint() logic for clarity. - Make flushPaint() start at the deepest node. - Make _compositeChild() avoid repainting children with hasLayer that aren't dirty, instead it just reuses their existing layer. - Made RenderView reuse the RenderObject layer instead of having its own. - Made RenderView have hasLayer set to true. - Add various asserts and comments.