blob: ca30baf2ac8cc35d74909a7445b14a86d1723d09 [file] [log] [blame]
// 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_path_layer.h"
#include "flutter/flow/paint_utils.h"
namespace flutter {
ClipPathLayer::ClipPathLayer(const SkPath& clip_path, Clip clip_behavior)
: clip_path_(clip_path), clip_behavior_(clip_behavior) {
FML_DCHECK(clip_behavior != Clip::none);
}
void ClipPathLayer::Diff(DiffContext* context, const Layer* old_layer) {
DiffContext::AutoSubtreeRestore subtree(context);
auto* prev = static_cast<const ClipPathLayer*>(old_layer);
if (!context->IsSubtreeDirty()) {
FML_DCHECK(prev);
if (clip_behavior_ != prev->clip_behavior_ ||
clip_path_ != prev->clip_path_) {
context->MarkSubtreeDirty(context->GetOldLayerPaintRegion(old_layer));
}
}
if (context->PushCullRect(clip_path_.getBounds())) {
DiffChildren(context, prev);
}
context->SetLayerPaintRegion(this, context->CurrentSubtreeRegion());
}
void ClipPathLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) {
TRACE_EVENT0("flutter", "ClipPathLayer::Preroll");
SkRect previous_cull_rect = context->cull_rect;
SkRect clip_path_bounds = clip_path_.getBounds();
if (!context->cull_rect.intersect(clip_path_bounds)) {
context->cull_rect.setEmpty();
}
Layer::AutoPrerollSaveLayerState save =
Layer::AutoPrerollSaveLayerState::Create(context, UsesSaveLayer());
context->mutators_stack.PushClipPath(clip_path_);
SkRect child_paint_bounds = SkRect::MakeEmpty();
PrerollChildren(context, matrix, &child_paint_bounds);
if (child_paint_bounds.intersect(clip_path_bounds)) {
set_paint_bounds(child_paint_bounds);
}
context->mutators_stack.Pop();
context->cull_rect = previous_cull_rect;
}
void ClipPathLayer::Paint(PaintContext& context) const {
TRACE_EVENT0("flutter", "ClipPathLayer::Paint");
FML_DCHECK(needs_painting(context));
SkAutoCanvasRestore save(context.internal_nodes_canvas, true);
context.internal_nodes_canvas->clipPath(clip_path_,
clip_behavior_ != Clip::hardEdge);
if (UsesSaveLayer()) {
TRACE_EVENT0("flutter", "Canvas::saveLayer");
context.internal_nodes_canvas->saveLayer(paint_bounds(), nullptr);
}
PaintChildren(context);
if (UsesSaveLayer()) {
context.internal_nodes_canvas->restore();
if (context.checkerboard_offscreen_layers) {
DrawCheckerboard(context.internal_nodes_canvas, paint_bounds());
}
}
}
} // namespace flutter