Add compositing, layers to app_list_demo

ui/views/cocoa/bridged_native_widget.mm

Index: ui/views/cocoa/bridged_native_widget.mm
diff --git a/ui/views/cocoa/bridged_native_widget.mm b/ui/views/cocoa/bridged_native_widget.mm
index 2a959daf9e139a6b5ccccc869ba79aa40d727c1c..34d724ca9fbf4de9ae6333e930b4c3e8b3691518 100644
--- a/ui/views/cocoa/bridged_native_widget.mm
+++ b/ui/views/cocoa/bridged_native_widget.mm
@@ -8,6 +8,9 @@
 #include "ui/base/ime/input_method.h"
 #include "ui/base/ime/input_method_factory.h"
 #include "ui/base/ui_base_switches_util.h"
+#include "ui/gfx/display.h"
+#import "ui/gfx/mac/coordinate_conversion.h"
+#include "ui/gfx/screen.h"
 #import "ui/views/cocoa/bridged_content_view.h"
 #import "ui/views/cocoa/views_nswindow_delegate.h"
 #include "ui/views/widget/native_widget_mac.h"
@@ -16,6 +19,25 @@
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
+#include "cc/output/copy_output_request.h"
+#include "cc/output/copy_output_result.h"
+
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/gfx/codec/png_codec.h"
+#include "ui/gfx/image/image_skia_rep.h"
+#include "ui/gfx/canvas.h"
+
+namespace {
+
+float GetDeviceScaleFactorFromDisplay(NSView* view) {
+  gfx::Display display = gfx::Screen::GetScreenFor(view)->
+      GetDisplayNearestWindow(view);
+  DCHECK(display.is_valid());
+  return display.device_scale_factor();
+}
+
+}  // namespace
+
 namespace views {
 
 BridgedNativeWidget::BridgedNativeWidget(NativeWidgetMac* parent)
@@ -64,10 +86,22 @@ void BridgedNativeWidget::SetFocusManager(FocusManager* focus_manager) {
   focus_manager_ = focus_manager;
 }
 
+void BridgedNativeWidget::SetBounds(const gfx::Rect& new_bounds) {
+  [window_ setFrame:gfx::ScreenRectToNSRect(new_bounds)
+            display:YES
+            animate:NO];
+  if (layer())
+    SetLayerSize(new_bounds.size());
+}
+
 void BridgedNativeWidget::SetRootView(views::View* view) {
   if (view == [bridged_view_ hostedView])
     return;
 
+  // If this is ever false, the compositor will need to be properly torn down
+  // and replaced, pointing at the new view.
+  DCHECK(!view || !compositor_view_);
+
   [bridged_view_ clearView];
   bridged_view_.reset();
   // Note that there can still be references to the old |bridged_view_|
@@ -105,6 +139,34 @@ ui::InputMethod* BridgedNativeWidget::GetHostInputMethod() {
   return input_method_.get();
 }
 
+ui::Layer* BridgedNativeWidget::GetOrCreateLayer() {
+  if (!bridged_view_)
+    return NULL;
+
+  if (layer())
+    return layer();
+
+  [bridged_view_ setWantsLayer:YES];
+  // Next line does nothing.
+  [[bridged_view_ layer]
+      setBackgroundColor:CGColorGetConstantColor(kCGColorClear)];
+
+  SetLayer(new ui::Layer());
+  layer()->set_delegate(this);
+  DCHECK_EQ(0u, [[bridged_view_ subviews] count]);
+  compositor_view_.reset(new content::BrowserCompositorViewMac(this));
+
+  DCHECK(compositor_view_->GetCompositor());
+  DCHECK_EQ(compositor_view_->GetCompositor(), layer()->GetCompositor());
+
+  [window_ setOpaque:NO];
+  layer()->GetCompositor()->SetHostHasTransparentBackground(true);
+  layer()->SetFillsBoundsCompletely(true);
+
+  SetLayerSize(native_widget_mac_->GetWindowBoundsInScreen().size());
+  return layer();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // BridgedNativeWidget, internal::InputMethodDelegate:
 
@@ -117,6 +179,24 @@ void BridgedNativeWidget::DispatchKeyEventPostIME(const ui::KeyEvent& key) {
     focus_manager_->OnKeyEvent(key);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// BridgedNativeWidget, content::BrowserCompositorViewMacClient:
+
+void BridgedNativeWidget::BrowserCompositorViewFrameSwapped(
+    const std::vector<ui::LatencyInfo>& latency_info) {
+}
+
+NSView* BridgedNativeWidget::BrowserCompositorSuperview() {
+ return bridged_view_;
+}
+
+ui::Layer* BridgedNativeWidget::BrowserCompositorRootLayer() {
+  return layer();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// BridgedNativeWidget, FocusChangeListener:
+
 void BridgedNativeWidget::OnWillChangeFocus(View* focused_before,
                                             View* focused_now) {
 }
@@ -129,6 +209,54 @@ void BridgedNativeWidget::OnDidChangeFocus(View* focused_before,
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// BridgedNativeWidget, LayerDelegate:
+
+static bool WritePNGFile(const SkBitmap& bitmap, const base::FilePath& file_path,
+    bool discard_transparency) {
+  std::vector<unsigned char> png_data;
+  if (gfx::PNGCodec::EncodeBGRASkBitmap(bitmap,
+                                        discard_transparency,
+                                        &png_data) &&
+      base::CreateDirectory(file_path.DirName())) {
+    char* data = reinterpret_cast<char*>(&png_data[0]);
+    int size = static_cast<int>(png_data.size());
+    bool result = base::WriteFile(file_path, data, size) == size;
+    return result;
+  }
+  return false;
+}
+
+static void ReadbackResult(scoped_ptr<cc::CopyOutputResult> result) {
+  DLOG(INFO) << "result!";
+  scoped_ptr<SkBitmap> result_bitmap = result->TakeBitmap().Pass();
+  static int filectr = 0;
+  std::ostringstream oss;
+  oss << "file" << filectr++ << ".png";
+  WritePNGFile(*result_bitmap, base::FilePath().AppendASCII(oss.str().c_str()), false);
+}
+
+void BridgedNativeWidget::OnPaintLayer(gfx::Canvas* canvas) {
+  layer()->RequestCopyOfOutput(cc::CopyOutputRequest::CreateBitmapRequest(base::Bind(&ReadbackResult)));
+  native_widget_mac_->GetWidget()->OnNativeWidgetPaint(canvas);
+
+  gfx::ImageSkiaRep image = canvas->ExtractImageRep();
+  static int filectr = 0;
+  std::ostringstream oss;
+  oss << "bpass" << filectr++ << ".png";
+  WritePNGFile(image.sk_bitmap(), base::FilePath().AppendASCII(oss.str().c_str()), false);
+
+}
+
+void BridgedNativeWidget::OnDeviceScaleFactorChanged(
+    float device_scale_factor) {
+}
+
+base::Closure BridgedNativeWidget::PrepareForLayerBoundsChange() {
+  return base::Bind(&BridgedNativeWidget::OnWindowBoundsChanged,
+                    base::Unretained(this));
+}
+
+////////////////////////////////////////////////////////////////////////////////
 // BridgedNativeWidget, private:
 
 void BridgedNativeWidget::RemoveOrDestroyChildren() {
@@ -138,4 +266,19 @@ void BridgedNativeWidget::RemoveOrDestroyChildren() {
   [child_windows makeObjectsPerformSelector:@selector(close)];
 }
 
+void BridgedNativeWidget::SetLayerSize(const gfx::Size& size_in_dip) {
+  DCHECK(layer());
+
+  layer()->SetBounds(gfx::Rect(size_in_dip));
+
+  float scale_factor = GetDeviceScaleFactorFromDisplay(bridged_view_);
+  gfx::Size size_in_pixels(size_in_dip.width() * scale_factor,
+                           size_in_dip.height() * scale_factor);
+  compositor_view_->GetCompositor()->SetScaleAndSize(scale_factor,
+                                                     size_in_pixels);
+}
+
+void BridgedNativeWidget::OnWindowBoundsChanged() {
+}
+
 }  // namespace views