Reland Mus Demo: Move definition of WindowTreeData into separate files

services/ui/demo/window_tree_data.cc

+// Copyright 2017 The Chromium 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 "services/ui/demo/window_tree_data.h"
+
+#include "base/time/time.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkImageInfo.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkRect.h"
+#include "ui/aura/mus/window_tree_host_mus.h"
+#include "ui/aura/window.h"
+#include "ui/aura_extra/image_window_delegate.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/image/image.h"
+
+namespace ui {
+namespace demo {
+
+namespace {
+
+// Milliseconds between frames.
+const int64_t kFrameDelay = 33;
+
+const SkColor kBgColor = SK_ColorRED;
+const SkColor kFgColor = SK_ColorYELLOW;
+
+void DrawSquare(const gfx::Rect& bounds,
+                double angle,
+                SkCanvas* canvas,
+                int size) {
+  // Create SkRect to draw centered inside the bounds.
+  gfx::Point top_left = bounds.CenterPoint();
+  top_left.Offset(-size / 2, -size / 2);
+  SkRect rect = SkRect::MakeXYWH(top_left.x(), top_left.y(), size, size);
+
+  // Set SkPaint to fill solid color.
+  SkPaint paint;
+  paint.setStyle(SkPaint::kFill_Style);
+  paint.setColor(kFgColor);
+
+  // Rotate the canvas.
+  const gfx::Size canvas_size = bounds.size();
+  if (angle != 0.0) {
+    canvas->translate(SkFloatToScalar(canvas_size.width() * 0.5f),
+                      SkFloatToScalar(canvas_size.height() * 0.5f));
+    canvas->rotate(angle);
+    canvas->translate(-SkFloatToScalar(canvas_size.width() * 0.5f),
+                      -SkFloatToScalar(canvas_size.height() * 0.5f));
+  }
+
+  canvas->drawRect(rect, paint);
+}
+
+}  // namespace
+
+WindowTreeData::WindowTreeData(int square_size) : square_size_(square_size) {}
+
+WindowTreeData::~WindowTreeData() {}
+
+aura::Window* WindowTreeData::bitmap_window() {
+  DCHECK(!window_tree_host_->window()->children().empty());
+  return window_tree_host_->window()->children()[0];
+}
+
+void WindowTreeData::Init(
+    std::unique_ptr<aura::WindowTreeHostMus> window_tree_host) {
+  window_tree_host->InitHost();
+  window_tree_host->Show();
+  // Take ownership of the WTH.
+  window_tree_host_ = std::move(window_tree_host);
+
+  // Initialize the window for the bitmap.
+  window_delegate_ = new aura_extra::ImageWindowDelegate();
+  aura::Window* root_window = window_tree_host_->window();
+  aura::Window* bitmap_window = new aura::Window(window_delegate_);
+  bitmap_window->Init(LAYER_TEXTURED);
+  bitmap_window->SetBounds(gfx::Rect(root_window->bounds().size()));
+  bitmap_window->Show();
+  bitmap_window->SetName("Bitmap");
+  root_window->AddChild(bitmap_window);
+
+  // Draw initial frame and start the timer to regularly draw frames.
+  DrawFrame();
+  timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(kFrameDelay),
+               base::Bind(&WindowTreeData::DrawFrame, base::Unretained(this)));
+}
+
+void WindowTreeData::DrawFrame() {
+  angle_ += 2.0;
+  if (angle_ >= 360.0)
+    angle_ = 0.0;
+
+  const gfx::Rect& bounds = bitmap_window()->bounds();
+
+  // Allocate a bitmap of correct size.
+  SkBitmap bitmap;
+  SkImageInfo image_info = SkImageInfo::MakeN32(bounds.width(), bounds.height(),
+                                                kPremul_SkAlphaType);
+  bitmap.allocPixels(image_info);
+
+  // Draw the rotated square on background in bitmap.
+  SkCanvas canvas(bitmap);
+  canvas.clear(kBgColor);
+  // TODO(kylechar): Add GL drawing instead of software rasterization in future.
+  DrawSquare(bounds, angle_, &canvas, square_size_);
+  canvas.flush();
+
+  gfx::ImageSkiaRep image_skia_rep(bitmap, 1);
+  gfx::ImageSkia image_skia(image_skia_rep);
+  gfx::Image image(image_skia);
+
+  window_delegate_->SetImage(image);
+  bitmap_window()->SchedulePaintInRect(gfx::Rect(bounds.size()));
+}
+
+}  // namespace demo
+}  // namespace ui