| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "flutter/flow/layers/clip_rect_layer.h" |
| #include "flutter/flow/paint_utils.h" |
| |
| namespace flutter { |
| |
| ClipRectLayer::ClipRectLayer(const SkRect& clip_rect, Clip clip_behavior) |
| : clip_rect_(clip_rect), clip_behavior_(clip_behavior) { |
| FML_DCHECK(clip_behavior != Clip::none); |
| } |
| |
| void ClipRectLayer::Diff(DiffContext* context, const Layer* old_layer) { |
| DiffContext::AutoSubtreeRestore subtree(context); |
| auto* prev = static_cast<const ClipRectLayer*>(old_layer); |
| if (!context->IsSubtreeDirty()) { |
| FML_DCHECK(prev); |
| if (clip_behavior_ != prev->clip_behavior_ || |
| clip_rect_ != prev->clip_rect_) { |
| context->MarkSubtreeDirty(context->GetOldLayerPaintRegion(old_layer)); |
| } |
| } |
| if (context->PushCullRect(clip_rect_)) { |
| DiffChildren(context, prev); |
| } |
| context->SetLayerPaintRegion(this, context->CurrentSubtreeRegion()); |
| } |
| |
| void ClipRectLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) { |
| TRACE_EVENT0("flutter", "ClipRectLayer::Preroll"); |
| |
| SkRect previous_cull_rect = context->cull_rect; |
| if (!context->cull_rect.intersect(clip_rect_)) { |
| context->cull_rect.setEmpty(); |
| } |
| Layer::AutoPrerollSaveLayerState save = |
| Layer::AutoPrerollSaveLayerState::Create(context, UsesSaveLayer()); |
| context->mutators_stack.PushClipRect(clip_rect_); |
| |
| SkRect child_paint_bounds = SkRect::MakeEmpty(); |
| PrerollChildren(context, matrix, &child_paint_bounds); |
| if (child_paint_bounds.intersect(clip_rect_)) { |
| set_paint_bounds(child_paint_bounds); |
| } |
| |
| context->mutators_stack.Pop(); |
| context->cull_rect = previous_cull_rect; |
| } |
| |
| void ClipRectLayer::Paint(PaintContext& context) const { |
| TRACE_EVENT0("flutter", "ClipRectLayer::Paint"); |
| FML_DCHECK(needs_painting(context)); |
| |
| SkAutoCanvasRestore save(context.internal_nodes_canvas, true); |
| context.internal_nodes_canvas->clipRect(clip_rect_, |
| clip_behavior_ != Clip::hardEdge); |
| |
| if (UsesSaveLayer()) { |
| TRACE_EVENT0("flutter", "Canvas::saveLayer"); |
| context.internal_nodes_canvas->saveLayer(clip_rect_, nullptr); |
| } |
| PaintChildren(context); |
| if (UsesSaveLayer()) { |
| context.internal_nodes_canvas->restore(); |
| if (context.checkerboard_offscreen_layers) { |
| DrawCheckerboard(context.internal_nodes_canvas, clip_rect_); |
| } |
| } |
| } |
| |
| } // namespace flutter |