Pass SurfaceFrame to SubmitFrame

Author: Emmanuel Garcia

ci/licenses_golden/licenses_flutter

@@ -616,6 +616,8 @@ FILE: ../../../flutter/shell/common/skia_event_tracer_impl.cc
 FILE: ../../../flutter/shell/common/skia_event_tracer_impl.h
 FILE: ../../../flutter/shell/common/surface.cc
 FILE: ../../../flutter/shell/common/surface.h
+FILE: ../../../flutter/shell/common/surface_frame.cc
+FILE: ../../../flutter/shell/common/surface_frame.h
 FILE: ../../../flutter/shell/common/switches.cc
 FILE: ../../../flutter/shell/common/switches.h
 FILE: ../../../flutter/shell/common/thread_host.cc

flow/BUILD.gn

@@ -73,6 +73,7 @@ source_set("flow") {
   deps = [
     "//flutter/common",
     "//flutter/fml",
+    "//flutter/shell/common:surface_frame",
     "//third_party/skia",
   ]
 

flow/embedded_views.cc

@@ -7,12 +7,10 @@
 namespace flutter {
 
 bool ExternalViewEmbedder::SubmitFrame(GrContext* context,
-                                       SkCanvas* background_canvas) {
-  return false;
+                                       std::unique_ptr<SurfaceFrame> frame) {
+  return frame->Submit();
 };
 
-void ExternalViewEmbedder::FinishFrame(){};
-
 void MutatorsStack::PushClipRect(const SkRect& rect) {
   std::shared_ptr<Mutator> element = std::make_shared<Mutator>(rect);
   vector_.push_back(element);

flow/embedded_views.h

@@ -9,6 +9,7 @@
 
 #include "flutter/fml/memory/ref_counted.h"
 #include "flutter/fml/raster_thread_merger.h"
+#include "flutter/shell/common/surface_frame.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkPoint.h"
@@ -248,10 +249,13 @@ class ExternalViewEmbedder {
   // Must be called on the UI thread.
   virtual SkCanvas* CompositeEmbeddedView(int view_id) = 0;
 
-  virtual bool SubmitFrame(GrContext* context, SkCanvas* background_canvas);
-
-  // This is called after submitting the embedder frame and the surface frame.
-  virtual void FinishFrame();
+  // Submits the frame by calling frame.Submit().
+  //
+  // This method can mutate the root Skia canvas before submitting the frame.
+  //
+  // It can also allocate frames for overlay surfaces to compose hybrid views.
+  virtual bool SubmitFrame(GrContext* context,
+                           std::unique_ptr<SurfaceFrame> frame);
 
   // This should only be called after |SubmitFrame|.
   // This method provides the embedder a way to do additional tasks after

shell/common/BUILD.gn

@@ -120,6 +120,7 @@ source_set("common") {
   ]
 
   deps = [
+    ":surface_frame",
     "//flutter/assets",
     "//flutter/common",
     "//flutter/flow",
@@ -141,6 +142,18 @@ source_set("common") {
   public_configs = [ "//flutter:config" ]
 }
 
+source_set("surface_frame") {
+  sources = [
+    "surface_frame.cc",
+    "surface_frame.h",
+  ]
+
+  deps = [
+    "//flutter/fml",
+    "//third_party/skia",
+  ]
+}
+
 template("shell_host_executable") {
   executable(target_name) {
     testonly = true

shell/common/rasterizer.cc

@@ -421,14 +421,11 @@ RasterStatus Rasterizer::DrawToSurface(flutter::LayerTree& layer_tree) {
       return raster_status;
     }
     if (external_view_embedder != nullptr) {
+      FML_DCHECK(!frame->IsSubmitted());
       external_view_embedder->SubmitFrame(surface_->GetContext(),
-                                          root_surface_canvas);
-      // The external view embedder may mutate the root surface canvas while
-      // submitting the frame.
-      // Therefore, submit the final frame after asking the external view
-      // embedder to submit the frame.
-      frame->Submit();
-      external_view_embedder->FinishFrame();
+                                          std::move(frame));
+      // The frame must be submitted at this point.
+      FML_DCHECK(frame->IsSubmitted());
     } else {
       frame->Submit();
     }

shell/common/shell_test_external_view_embedder.cc

@@ -33,14 +33,12 @@ SkCanvas* ShellTestExternalViewEmbedder::CompositeEmbeddedView(int view_id) {
 }
 
 // |ExternalViewEmbedder|
-bool ShellTestExternalViewEmbedder::SubmitFrame(GrContext* context,
-                                                SkCanvas* background_canvas) {
-  return true;
+bool ShellTestExternalViewEmbedder::SubmitFrame(
+    GrContext* context,
+    std::unique_ptr<SurfaceFrame> frame) {
+  return frame->Submit();
 }
 
-// |ExternalViewEmbedder|
-void ShellTestExternalViewEmbedder::FinishFrame() {}
-
 // |ExternalViewEmbedder|
 void ShellTestExternalViewEmbedder::EndFrame(
     fml::RefPtr<fml::RasterThreadMerger> raster_thread_merger) {

shell/common/shell_test_external_view_embedder.h

@@ -49,10 +49,8 @@ class ShellTestExternalViewEmbedder final : public ExternalViewEmbedder {
   SkCanvas* CompositeEmbeddedView(int view_id) override;
 
   // |ExternalViewEmbedder|
-  bool SubmitFrame(GrContext* context, SkCanvas* background_canvas) override;
-
-  // |ExternalViewEmbedder|
-  void FinishFrame() override;
+  bool SubmitFrame(GrContext* context,
+                   std::unique_ptr<SurfaceFrame> frame) override;
 
   // |ExternalViewEmbedder|
   void EndFrame(

shell/common/surface.cc

@@ -4,58 +4,8 @@
 
 #include "flutter/shell/common/surface.h"
 
-#include "flutter/fml/logging.h"
-#include "third_party/skia/include/core/SkSurface.h"
-
 namespace flutter {
 
-SurfaceFrame::SurfaceFrame(sk_sp<SkSurface> surface,
-                           bool supports_readback,
-                           const SubmitCallback& submit_callback)
-    : submitted_(false),
-      surface_(surface),
-      supports_readback_(supports_readback),
-      submit_callback_(submit_callback) {
-  FML_DCHECK(submit_callback_);
-}
-
-SurfaceFrame::~SurfaceFrame() {
-  if (submit_callback_ && !submitted_) {
-    // Dropping without a Submit.
-    submit_callback_(*this, nullptr);
-  }
-}
-
-bool SurfaceFrame::Submit() {
-  if (submitted_) {
-    return false;
-  }
-
-  submitted_ = PerformSubmit();
-
-  return submitted_;
-}
-
-SkCanvas* SurfaceFrame::SkiaCanvas() {
-  return surface_ != nullptr ? surface_->getCanvas() : nullptr;
-}
-
-sk_sp<SkSurface> SurfaceFrame::SkiaSurface() const {
-  return surface_;
-}
-
-bool SurfaceFrame::PerformSubmit() {
-  if (submit_callback_ == nullptr) {
-    return false;
-  }
-
-  if (submit_callback_(*this, SkiaCanvas())) {
-    return true;
-  }
-
-  return false;
-}
-
 Surface::Surface() = default;
 
 Surface::~Surface() = default;

shell/common/surface.h

@@ -10,42 +10,10 @@
 #include "flutter/flow/compositor_context.h"
 #include "flutter/flow/embedded_views.h"
 #include "flutter/fml/macros.h"
-#include "third_party/skia/include/core/SkCanvas.h"
+#include "flutter/shell/common/surface_frame.h"
 
 namespace flutter {
 
-/// Represents a Frame that has been fully configured for the underlying client
-/// rendering API. A frame may only be submitted once.
-class SurfaceFrame {
- public:
-  using SubmitCallback =
-      std::function<bool(const SurfaceFrame& surface_frame, SkCanvas* canvas)>;
-
-  SurfaceFrame(sk_sp<SkSurface> surface,
-               bool supports_readback,
-               const SubmitCallback& submit_callback);
-
-  ~SurfaceFrame();
-
-  bool Submit();
-
-  SkCanvas* SkiaCanvas();
-
-  sk_sp<SkSurface> SkiaSurface() const;
-
-  bool supports_readback() { return supports_readback_; }
-
- private:
-  bool submitted_;
-  sk_sp<SkSurface> surface_;
-  bool supports_readback_;
-  SubmitCallback submit_callback_;
-
-  bool PerformSubmit();
-
-  FML_DISALLOW_COPY_AND_ASSIGN(SurfaceFrame);
-};
-
 /// Abstract Base Class that represents where we will be rendering content.
 class Surface {
  public: