From 1b8d5b7233c31d55553e9ff6cfaee727e89fbd55 Mon Sep 17 00:00:00 2001
From: JsouLiang <weiguoliang@bytedance.com>
Date: Wed, 31 Aug 2022 17:38:32 +0800
Subject: [PATCH] Make shader mask layer code builder aware
 (flutter/engine#35622)

---
 .../flutter/flow/layers/shader_mask_layer.cc  | 42 ++++++++++++-------
 .../flutter/flow/layers/shader_mask_layer.h   |  4 +-
 .../layers/shader_mask_layer_unittests.cc     | 11 +++--
 3 files changed, 35 insertions(+), 22 deletions(-)

diff --git a/engine/src/flutter/flow/layers/shader_mask_layer.cc b/engine/src/flutter/flow/layers/shader_mask_layer.cc
index b7dd47e48d9..d4a441417e9 100644
--- a/engine/src/flutter/flow/layers/shader_mask_layer.cc
+++ b/engine/src/flutter/flow/layers/shader_mask_layer.cc
@@ -7,12 +7,12 @@
 
 namespace flutter {
 
-ShaderMaskLayer::ShaderMaskLayer(std::shared_ptr<DlColorSource> shader,
+ShaderMaskLayer::ShaderMaskLayer(std::shared_ptr<DlColorSource> color_source,
                                  const SkRect& mask_rect,
                                  DlBlendMode blend_mode)
     : CacheableContainerLayer(
           RasterCacheUtil::kMinimumRendersBeforeCachingFilterLayer),
-      shader_(std::move(shader)),
+      color_source_(std::move(color_source)),
       mask_rect_(mask_rect),
       blend_mode_(blend_mode) {}
 
@@ -21,8 +21,8 @@ void ShaderMaskLayer::Diff(DiffContext* context, const Layer* old_layer) {
   auto* prev = static_cast<const ShaderMaskLayer*>(old_layer);
   if (!context->IsSubtreeDirty()) {
     FML_DCHECK(prev);
-    if (shader_ != prev->shader_ || mask_rect_ != prev->mask_rect_ ||
-        blend_mode_ != prev->blend_mode_) {
+    if (color_source_ != prev->color_source_ ||
+        mask_rect_ != prev->mask_rect_ || blend_mode_ != prev->blend_mode_) {
       context->MarkSubtreeDirty(context->GetOldLayerPaintRegion(old_layer));
     }
   }
@@ -54,19 +54,33 @@ void ShaderMaskLayer::Paint(PaintContext& context) const {
       return;
     }
   }
+  auto shader_rect = SkRect::MakeWH(mask_rect_.width(), mask_rect_.height());
 
-  Layer::AutoSaveLayer save = Layer::AutoSaveLayer::Create(
-      context, paint_bounds(), cache_paint.sk_paint());
-  PaintChildren(context);
+  if (context.leaf_nodes_builder) {
+    context.builder_multiplexer->saveLayer(&paint_bounds(),
+                                           cache_paint.dl_paint());
+    PaintChildren(context);
 
-  SkPaint paint;
-  paint.setBlendMode(ToSk(blend_mode_));
-  if (shader_) {
-    paint.setShader(shader_->skia_object());
+    DlPaint dl_paint;
+    dl_paint.setBlendMode(blend_mode_);
+    if (color_source_) {
+      dl_paint.setColorSource(color_source_.get());
+    }
+    context.leaf_nodes_builder->translate(mask_rect_.left(), mask_rect_.top());
+    context.leaf_nodes_builder->drawRect(shader_rect, dl_paint);
+    context.builder_multiplexer->restore();
+  } else {
+    Layer::AutoSaveLayer save = Layer::AutoSaveLayer::Create(
+        context, paint_bounds(), cache_paint.sk_paint());
+    PaintChildren(context);
+    SkPaint paint;
+    paint.setBlendMode(ToSk(blend_mode_));
+    if (color_source_) {
+      paint.setShader(color_source_->skia_object());
+    }
+    context.leaf_nodes_canvas->translate(mask_rect_.left(), mask_rect_.top());
+    context.leaf_nodes_canvas->drawRect(shader_rect, paint);
   }
-  context.leaf_nodes_canvas->translate(mask_rect_.left(), mask_rect_.top());
-  context.leaf_nodes_canvas->drawRect(
-      SkRect::MakeWH(mask_rect_.width(), mask_rect_.height()), paint);
 }
 
 }  // namespace flutter
diff --git a/engine/src/flutter/flow/layers/shader_mask_layer.h b/engine/src/flutter/flow/layers/shader_mask_layer.h
index 63ac4421d63..491348ae663 100644
--- a/engine/src/flutter/flow/layers/shader_mask_layer.h
+++ b/engine/src/flutter/flow/layers/shader_mask_layer.h
@@ -12,7 +12,7 @@ namespace flutter {
 
 class ShaderMaskLayer : public CacheableContainerLayer {
  public:
-  ShaderMaskLayer(std::shared_ptr<DlColorSource> shader,
+  ShaderMaskLayer(std::shared_ptr<DlColorSource> color_source,
                   const SkRect& mask_rect,
                   DlBlendMode blend_mode);
 
@@ -23,7 +23,7 @@ class ShaderMaskLayer : public CacheableContainerLayer {
   void Paint(PaintContext& context) const override;
 
  private:
-  std::shared_ptr<DlColorSource> shader_;
+  std::shared_ptr<DlColorSource> color_source_;
   SkRect mask_rect_;
   DlBlendMode blend_mode_;
 
diff --git a/engine/src/flutter/flow/layers/shader_mask_layer_unittests.cc b/engine/src/flutter/flow/layers/shader_mask_layer_unittests.cc
index 5f6c38b76a0..b6412f24972 100644
--- a/engine/src/flutter/flow/layers/shader_mask_layer_unittests.cc
+++ b/engine/src/flutter/flow/layers/shader_mask_layer_unittests.cc
@@ -373,17 +373,16 @@ TEST_F(ShaderMaskLayerTest, OpacityInheritance) {
     {
       expected_builder.translate(offset.fX, offset.fY);
       /* ShaderMaskLayer::Paint() */ {
-        expected_builder.setColor(opacity_alpha << 24);
-        expected_builder.saveLayer(&child_path.getBounds(), true);
+        DlPaint sl_paint = DlPaint().setColor(opacity_alpha << 24);
+        expected_builder.saveLayer(&child_path.getBounds(), &sl_paint);
         {
           /* child layer paint */ {
-            expected_builder.setColor(0xFF000000);
-            expected_builder.drawPath(child_path);
+            expected_builder.drawPath(child_path, DlPaint());
           }
           expected_builder.translate(mask_rect.fLeft, mask_rect.fTop);
-          expected_builder.setBlendMode(DlBlendMode::kSrc);
           expected_builder.drawRect(
-              SkRect::MakeWH(mask_rect.width(), mask_rect.height()));
+              SkRect::MakeWH(mask_rect.width(), mask_rect.height()),
+              DlPaint().setBlendMode(DlBlendMode::kSrc));
         }
         expected_builder.restore();
       }