adds invalidate method and proper resizing

atom/browser/api/atom_api_web_contents.cc

@@ -1418,6 +1418,15 @@ int WebContents::GetFrameRate() const {
   return osr_rwhv ? osr_rwhv->GetFrameRate() : 0;
 }
 
+void WebContents::Invalidate() {
+  if (!IsOffScreen())
+    return;
+
+  auto* osr_rwhv = static_cast<OffScreenRenderWidgetHostView*>(
+      web_contents()->GetRenderWidgetHostView());
+  if (osr_rwhv)
+    osr_rwhv->Invalidate();
+}
 
 v8::Local<v8::Value> WebContents::GetWebPreferences(v8::Isolate* isolate) {
   WebContentsPreferences* web_preferences =
@@ -1527,6 +1536,7 @@ void WebContents::BuildPrototype(v8::Isolate* isolate,
       .SetMethod("isPainting", &WebContents::IsPainting)
       .SetMethod("setFrameRate", &WebContents::SetFrameRate)
       .SetMethod("getFrameRate", &WebContents::GetFrameRate)
+      .SetMethod("invalidate", &WebContents::Invalidate)
       .SetMethod("getType", &WebContents::GetType)
       .SetMethod("getWebPreferences", &WebContents::GetWebPreferences)
       .SetMethod("getOwnerBrowserWindow", &WebContents::GetOwnerBrowserWindow)

atom/browser/api/atom_api_web_contents.h

@@ -164,6 +164,7 @@ class WebContents : public mate::TrackableObject<WebContents>,
   bool IsPainting() const;
   void SetFrameRate(int frame_rate);
   int GetFrameRate() const;
+  void Invalidate();
 
   // Callback triggered on permission response.
   void OnEnterFullscreenModeForTab(content::WebContents* source,

atom/browser/native_window.cc

@@ -205,6 +205,10 @@ void NativeWindow::InitFromOptions(const mate::Dictionary& options) {
 
 void NativeWindow::SetSize(const gfx::Size& size, bool animate) {
   SetBounds(gfx::Rect(GetPosition(), size), animate);
+
+  const auto view = web_contents()->GetRenderWidgetHostView();
+  if (view)
+    view->SetSize(size);
 }
 
 gfx::Size NativeWindow::GetSize() {

atom/browser/osr/osr_output_device.cc

@@ -24,6 +24,8 @@ void OffScreenOutputDevice::Resize(
     const gfx::Size& pixel_size, float scale_factor) {
   scale_factor_ = scale_factor;
 
+  printf("OffScreenOutputDevice::Resize\n");
+
   if (viewport_pixel_size_ == pixel_size) return;
   viewport_pixel_size_ = pixel_size;
 

atom/browser/osr/osr_render_widget_host_view.cc

@@ -439,11 +439,7 @@ content::RenderWidgetHost* OffScreenRenderWidgetHostView::GetRenderWidgetHost()
 void OffScreenRenderWidgetHostView::SetSize(const gfx::Size& size) {
   size_ = size;
 
-  const gfx::Size& size_in_pixels =
+  ResizeRootLayer();
-    gfx::ConvertSizeToPixel(scale_factor_, size);
-
-  GetRootLayer()->SetBounds(gfx::Rect(size));
-  GetCompositor()->SetScaleAndSize(scale_factor_, size_in_pixels);
 }
 
 void OffScreenRenderWidgetHostView::SetBounds(const gfx::Rect& new_bounds) {
@@ -892,6 +888,17 @@ void OffScreenRenderWidgetHostView::SetupFrameRate(bool force) {
   }
 }
 
+void OffScreenRenderWidgetHostView::Invalidate() {
+  const gfx::Rect& bounds_in_pixels = GetViewBounds();
+
+  printf("Invalidate\n");
+  if (software_output_device_) {
+    software_output_device_->OnPaint(bounds_in_pixels);
+  } else if (copy_frame_generator_.get()) {
+    copy_frame_generator_->GenerateCopyFrame(true, bounds_in_pixels);
+  }
+}
+
 void OffScreenRenderWidgetHostView::ResizeRootLayer() {
   SetupFrameRate(false);
 

atom/browser/osr/osr_render_widget_host_view.h

@@ -193,6 +193,8 @@ class OffScreenRenderWidgetHostView
   ui::Layer* GetRootLayer() const;
   content::DelegatedFrameHost* GetDelegatedFrameHost() const;
 
+  void Invalidate();
+
   content::RenderWidgetHostImpl* render_widget_host() const
       { return render_widget_host_; }
   NativeWindow* window() const { return native_window_; }