Adds support for point conversions to ui::Layer.

Also adds a skeleton for testing compositor API changes.

BUG=none
TEST=see unittest
Review URL: http://codereview.chromium.org/7769001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@98689 0039d316-1c4b-4281-b951-d872f2087c98

10 files changed, 430 insertions, 0 deletions

diff --git a/ui/gfx/compositor/compositor.gyp b/ui/gfx/compositor/compositor.gyp
index 5a76bce..7614e15 100644
--- a/ui/gfx/compositor/compositor.gyp
+++ b/ui/gfx/compositor/compositor.gyp
@@ -76,5 +76,32 @@
         }],
       ],
     },
+    
+    {
+      'target_name': 'compositor_unittests',
+      'type': 'executable',
+      'dependencies': [
+        '<(DEPTH)/base/base.gyp:base',
+        '<(DEPTH)/base/base.gyp:test_support_base',
+        '<(DEPTH)/skia/skia.gyp:skia',
+        '<(DEPTH)/testing/gtest.gyp:gtest',
+        '<(DEPTH)/ui/gfx/gl/gl.gyp:gl',
+        '<(DEPTH)/ui/ui.gyp:gfx_resources',
+        '<(DEPTH)/ui/ui.gyp:ui',
+        '<(DEPTH)/ui/ui.gyp:ui_resources',
+        'compositor',
+      ],
+      'sources': [
+        'layer_unittest.cc',
+        'run_all_unittests.cc',
+        'test_compositor_host.h',
+        'test_compositor_host_win.cc',
+        'test_suite.cc',
+        'test_suite.h',
+        '<(SHARED_INTERMEDIATE_DIR)/ui/gfx/gfx_resources.rc',
+        '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources/ui_resources.rc',
+      ],
+    },
+    
   ],
 }
diff --git a/ui/gfx/compositor/layer.cc b/ui/gfx/compositor/layer.cc
index 8061294..4f1ed241 100644
--- a/ui/gfx/compositor/layer.cc
+++ b/ui/gfx/compositor/layer.cc
@@ -7,6 +7,7 @@
 #include <algorithm>
 
 #include "base/logging.h"
+#include "ui/gfx/point3.h"
 
 namespace ui {
 
@@ -45,6 +46,14 @@ void Layer::Remove(Layer* child) {
     RecomputeHole();
 }
 
+bool Layer::Contains(const Layer* other) const {
+  for (const Layer* parent = other; parent; parent = parent->parent()) {
+    if (parent == this)
+      return true;
+  }
+  return false;
+}
+
 void Layer::SetTransform(const ui::Transform& transform) {
   transform_ = transform;
 
@@ -59,6 +68,25 @@ void Layer::SetBounds(const gfx::Rect& bounds) {
     parent()->RecomputeHole();
 }
 
+// static
+void Layer::ConvertPointToLayer(const Layer* source,
+                                const Layer* target,
+                                gfx::Point* point) {
+  const Layer* inner = NULL;
+  const Layer* outer = NULL;
+  if (source->Contains(target)) {
+    inner = target;
+    outer = source;
+    inner->ConvertPointFromAncestor(outer, point);
+  } else if (target->Contains(source)) {
+    inner = source;
+    outer = target;
+    inner->ConvertPointForAncestor(outer, point);
+  } else {
+    NOTREACHED(); // |source| and |target| are in unrelated hierarchies.
+  }
+}
+
 void Layer::SetFillsBoundsOpaquely(bool fills_bounds_opaquely) {
   if (fills_bounds_opaquely_ == fills_bounds_opaquely)
     return;
@@ -144,4 +172,36 @@ void Layer::RecomputeHole() {
   hole_rect_ = gfx::Rect();
 }
 
+bool Layer::ConvertPointForAncestor(const Layer* ancestor,
+                                    gfx::Point* point) const {
+  ui::Transform transform;
+  bool result = GetTransformRelativeTo(ancestor, &transform);
+  gfx::Point3f p(*point);
+  transform.TransformPoint(p);
+  *point = p.AsPoint();
+  return result;
+}
+
+bool Layer::ConvertPointFromAncestor(const Layer* ancestor,
+                                     gfx::Point* point) const {
+  ui::Transform transform;
+  bool result = GetTransformRelativeTo(ancestor, &transform);
+  gfx::Point3f p(*point);
+  transform.TransformPointReverse(p);
+  *point = p.AsPoint();
+  return result;
+}
+
+bool Layer::GetTransformRelativeTo(const Layer* ancestor,
+                                   ui::Transform* transform) const {
+  const Layer* p = this;
+  for (; p && p != ancestor; p = p->parent()) {
+    if (p->transform().HasChange())
+      transform->ConcatTransform(p->transform());
+    transform->ConcatTranslate(static_cast<float>(p->bounds().x()),
+                               static_cast<float>(p->bounds().y()));
+  }
+  return p == ancestor;
+}
+
 }  // namespace ui
diff --git a/ui/gfx/compositor/layer.h b/ui/gfx/compositor/layer.h
index 7bbc890..d523c9c 100644
--- a/ui/gfx/compositor/layer.h
+++ b/ui/gfx/compositor/layer.h
@@ -44,6 +44,9 @@ class COMPOSITOR_EXPORT Layer {
   const Layer* parent() const { return parent_; }
   Layer* parent() { return parent_; }
 
+  // Returns true if this Layer contains |other| somewhere in its children.
+  bool Contains(const Layer* other) const;
+
   // The transform, relative to the parent.
   void SetTransform(const ui::Transform& transform);
   const ui::Transform& transform() const { return transform_; }
@@ -52,6 +55,13 @@ class COMPOSITOR_EXPORT Layer {
   void SetBounds(const gfx::Rect& bounds);
   const gfx::Rect& bounds() const { return bounds_; }
 
+  // Converts a point from the coordinates of |source| to the coordinates of
+  // |target|. Necessarily, |source| and |target| must inhabit the same Layer
+  // tree.
+  static void ConvertPointToLayer(const Layer* source,
+                                  const Layer* target,
+                                  gfx::Point* point);
+
   // See description in View for details
   void SetFillsBoundsOpaquely(bool fills_bounds_opaquely);
   bool fills_bounds_opaquely() const { return fills_bounds_opaquely_; }
@@ -102,6 +112,12 @@ class COMPOSITOR_EXPORT Layer {
   // view has no transfrom with respect to its parent.
   void RecomputeHole();
 
+  bool ConvertPointForAncestor(const Layer* ancestor, gfx::Point* point) const;
+  bool ConvertPointFromAncestor(const Layer* ancestor, gfx::Point* point) const;
+
+  bool GetTransformRelativeTo(const Layer* ancestor,
+                              Transform* transform) const;
+
   Compositor* compositor_;
 
   scoped_refptr<ui::Texture> texture_;
diff --git a/ui/gfx/compositor/layer_unittest.cc b/ui/gfx/compositor/layer_unittest.cc
new file mode 100644
index 0000000..3a82d2a
--- /dev/null
+++ b/ui/gfx/compositor/layer_unittest.cc
@@ -0,0 +1,162 @@
+// Copyright (c) 2011 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 "base/basictypes.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/canvas_skia.h"
+#include "ui/gfx/compositor/layer.h"
+#include "ui/gfx/compositor/test_compositor_host.h"
+
+namespace ui {
+
+namespace {
+
+class LayerTest : public testing::Test {
+ public:
+  LayerTest() {}
+  virtual ~LayerTest() {}
+
+  // Overridden from testing::Test:
+  virtual void SetUp() OVERRIDE {
+    const gfx::Rect host_bounds(10, 10, 500, 500);
+    window_.reset(TestCompositorHost::Create(host_bounds));
+    window_->Show();
+  }
+
+  virtual void TearDown() OVERRIDE {
+  }
+
+  Compositor* GetCompositor() {
+    return window_->GetCompositor();
+  }
+
+  Layer* CreateLayer() {
+    return new Layer(GetCompositor());
+  }
+
+  Layer* CreateColorLayer(SkColor color, const gfx::Rect& bounds) {
+    Layer* layer = CreateLayer();
+    layer->SetBounds(bounds);
+    PaintColorToLayer(layer, color);
+    return layer;
+  }
+
+  gfx::Canvas* CreateCanvasForLayer(const Layer* layer) {
+    return gfx::Canvas::CreateCanvas(layer->bounds().width(),
+                                     layer->bounds().height(),
+                                     false);
+  }
+
+  void PaintColorToLayer(Layer* layer, SkColor color) {
+    scoped_ptr<gfx::Canvas> canvas(CreateCanvasForLayer(layer));
+    canvas->FillRectInt(color, 0, 0, layer->bounds().width(),
+                        layer->bounds().height());
+    layer->SetCanvas(*canvas->AsCanvasSkia(), layer->bounds().origin());
+  }
+
+  void DrawTree(Layer* root) {
+    window_->GetCompositor()->NotifyStart();
+    DrawLayerChildren(root);
+    window_->GetCompositor()->NotifyEnd();
+  }
+
+  void DrawLayerChildren(Layer* layer) {
+    layer->Draw();
+    std::vector<Layer*>::const_iterator it = layer->children().begin();
+    while (it != layer->children().end()) {
+      DrawLayerChildren(*it);
+      ++it;
+    }
+  }
+
+  void RunPendingMessages() {
+    MessageLoop main_message_loop(MessageLoop::TYPE_UI);
+    MessageLoopForUI::current()->Run(NULL);
+  }
+
+ private:
+  scoped_ptr<TestCompositorHost> window_;
+
+  DISALLOW_COPY_AND_ASSIGN(LayerTest);
+};
+
+}
+
+TEST_F(LayerTest, Draw) {
+  scoped_ptr<Layer> layer(CreateColorLayer(SK_ColorRED,
+                                           gfx::Rect(20, 20, 50, 50)));
+  DrawTree(layer.get());
+}
+
+// Create this hierarchy:
+// L1 - red
+// +-- L2 - blue
+// |   +-- L3 - yellow
+// +-- L4 - magenta
+//
+TEST_F(LayerTest, Hierarchy) {
+  scoped_ptr<Layer> l1(CreateColorLayer(SK_ColorRED,
+                                        gfx::Rect(20, 20, 400, 400)));
+  scoped_ptr<Layer> l2(CreateColorLayer(SK_ColorBLUE,
+                                        gfx::Rect(10, 10, 350, 350)));
+  scoped_ptr<Layer> l3(CreateColorLayer(SK_ColorYELLOW,
+                                        gfx::Rect(5, 5, 25, 25)));
+  scoped_ptr<Layer> l4(CreateColorLayer(SK_ColorMAGENTA,
+                                        gfx::Rect(300, 300, 100, 100)));
+
+  l1->Add(l2.get());
+  l1->Add(l4.get());
+  l2->Add(l3.get());
+
+  DrawTree(l1.get());
+}
+
+// L1
+//  +-- L2
+TEST_F(LayerTest, ConvertPointToLayer_Simple) {
+  scoped_ptr<Layer> l1(CreateColorLayer(SK_ColorRED,
+                                        gfx::Rect(20, 20, 400, 400)));
+  scoped_ptr<Layer> l2(CreateColorLayer(SK_ColorBLUE,
+                                        gfx::Rect(10, 10, 350, 350)));
+  l1->Add(l2.get());
+  DrawTree(l1.get());
+
+  gfx::Point point1_in_l2_coords(5, 5);
+  Layer::ConvertPointToLayer(l2.get(), l1.get(), &point1_in_l2_coords);
+  gfx::Point point1_in_l1_coords(15, 15);
+  EXPECT_EQ(point1_in_l1_coords, point1_in_l2_coords);
+
+  gfx::Point point2_in_l1_coords(5, 5);
+  Layer::ConvertPointToLayer(l1.get(), l2.get(), &point2_in_l1_coords);
+  gfx::Point point2_in_l2_coords(-5, -5);
+  EXPECT_EQ(point2_in_l2_coords, point2_in_l1_coords);
+}
+
+// L1
+//  +-- L2
+//       +-- L3
+TEST_F(LayerTest, ConvertPointToLayer_Medium) {
+  scoped_ptr<Layer> l1(CreateColorLayer(SK_ColorRED,
+                                        gfx::Rect(20, 20, 400, 400)));
+  scoped_ptr<Layer> l2(CreateColorLayer(SK_ColorBLUE,
+                                        gfx::Rect(10, 10, 350, 350)));
+  scoped_ptr<Layer> l3(CreateColorLayer(SK_ColorYELLOW,
+                                        gfx::Rect(10, 10, 100, 100)));
+  l1->Add(l2.get());
+  l2->Add(l3.get());
+  DrawTree(l1.get());
+
+  gfx::Point point1_in_l3_coords(5, 5);
+  Layer::ConvertPointToLayer(l3.get(), l1.get(), &point1_in_l3_coords);
+  gfx::Point point1_in_l1_coords(25, 25);
+  EXPECT_EQ(point1_in_l1_coords, point1_in_l3_coords);
+
+  gfx::Point point2_in_l1_coords(5, 5);
+  Layer::ConvertPointToLayer(l1.get(), l3.get(), &point2_in_l1_coords);
+  gfx::Point point2_in_l3_coords(-15, -15);
+  EXPECT_EQ(point2_in_l3_coords, point2_in_l1_coords);
+}
+
+}  // namespace ui
+
diff --git a/ui/gfx/compositor/run_all_unittests.cc b/ui/gfx/compositor/run_all_unittests.cc
new file mode 100644
index 0000000..5419134
--- /dev/null
+++ b/ui/gfx/compositor/run_all_unittests.cc
@@ -0,0 +1,9 @@
+// Copyright (c) 2011 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 "ui/gfx/compositor/test_suite.h"
+
+int main(int argc, char** argv) {
+  return CompositorTestSuite(argc, argv).Run();
+}
diff --git a/ui/gfx/compositor/test_compositor_host.h b/ui/gfx/compositor/test_compositor_host.h
new file mode 100644
index 0000000..f0bdbaa
--- /dev/null
+++ b/ui/gfx/compositor/test_compositor_host.h
@@ -0,0 +1,36 @@
+// Copyright (c) 2011 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.
+
+#ifndef UI_GFX_COMPOSITOR_TEST_COMPOSITOR_HOST_H_
+#define UI_GFX_COMPOSITOR_TEST_COMPOSITOR_HOST_H_
+#pragma once
+
+#include "base/message_loop.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace gfx {
+class Rect;
+class Size;
+}
+
+namespace ui {
+
+class Compositor;
+
+class TestCompositorHost : public MessageLoop::Dispatcher {
+ public:
+  virtual ~TestCompositorHost() {}
+
+  // Creates a new TestCompositorHost. The caller owns the returned value.
+  static TestCompositorHost* Create(const gfx::Rect& bounds);
+
+  // Shows the TestCompositorHost.
+  virtual void Show() = 0;
+
+  virtual ui::Compositor* GetCompositor() = 0;
+};
+
+}  // namespace ui
+
+#endif  // UI_GFX_COMPOSITOR_TEST_COMPOSITOR_HOST_H_
diff --git a/ui/gfx/compositor/test_compositor_host_win.cc b/ui/gfx/compositor/test_compositor_host_win.cc
new file mode 100644
index 0000000..f126b08
--- /dev/null
+++ b/ui/gfx/compositor/test_compositor_host_win.cc
@@ -0,0 +1,64 @@
+// Copyright (c) 2011 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 "ui/gfx/compositor/test_compositor_host.h"
+
+#include "ui/base/win/window_impl.h"
+#include "ui/gfx/compositor/compositor.h"
+
+namespace ui {
+
+class TestCompositorHostWin : public TestCompositorHost,
+                              public ui::WindowImpl {
+ public:
+  explicit TestCompositorHostWin(const gfx::Rect& bounds) {
+    Init(NULL, bounds);
+    compositor_ = ui::Compositor::Create(hwnd(), GetSize());
+  }
+
+  virtual ~TestCompositorHostWin() {
+    DestroyWindow(hwnd());
+  }
+
+  // Overridden from MessageLoop::Dispatcher:
+  virtual bool Dispatch(const MSG& msg) {
+    TranslateMessage(&msg);
+    DispatchMessage(&msg);
+    return true;
+  }
+
+  // Overridden from TestCompositorHost:
+  virtual void Show() OVERRIDE {
+    ShowWindow(hwnd(), SW_SHOWNORMAL);
+  }
+  virtual ui::Compositor* GetCompositor() OVERRIDE {
+    return compositor_;
+  }
+
+ private:
+  BEGIN_MSG_MAP_EX(TestCompositorHostWin)
+    MSG_WM_PAINT(OnPaint)
+  END_MSG_MAP()
+
+  void OnPaint(HDC dc) {
+    ValidateRect(hwnd(), NULL);
+  }
+
+  gfx::Size GetSize() {
+    RECT r;
+    GetClientRect(hwnd(), &r);
+    return gfx::Rect(r).size();
+  }
+
+  scoped_refptr<ui::Compositor> compositor_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestCompositorHostWin);
+};
+
+TestCompositorHost* TestCompositorHost::Create(const gfx::Rect& bounds) {
+  return new TestCompositorHostWin(bounds);
+}
+
+}  // namespace ui
+
diff --git a/ui/gfx/compositor/test_suite.cc b/ui/gfx/compositor/test_suite.cc
new file mode 100644
index 0000000..bcba004
--- /dev/null
+++ b/ui/gfx/compositor/test_suite.cc
@@ -0,0 +1,32 @@
+// Copyright (c) 2011 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 "ui/gfx/compositor/test_suite.h"
+
+#include "base/file_path.h"
+#include "base/path_service.h"
+#include "build/build_config.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/base/ui_base_paths.h"
+#include "ui/gfx/gfx_paths.h"
+
+CompositorTestSuite::CompositorTestSuite(int argc, char** argv)
+    : TestSuite(argc, argv) {}
+
+void CompositorTestSuite::Initialize() {
+  base::TestSuite::Initialize();
+
+  gfx::RegisterPathProvider();
+  ui::RegisterPathProvider();
+
+  // Force unittests to run using en-US so if we test against string
+  // output, it'll pass regardless of the system language.
+  ui::ResourceBundle::InitSharedInstance("en-US");
+}
+
+void CompositorTestSuite::Shutdown() {
+  ui::ResourceBundle::CleanupSharedInstance();
+
+  base::TestSuite::Shutdown();
+}
diff --git a/ui/gfx/compositor/test_suite.h b/ui/gfx/compositor/test_suite.h
new file mode 100644
index 0000000..0472a24
--- /dev/null
+++ b/ui/gfx/compositor/test_suite.h
@@ -0,0 +1,22 @@
+// Copyright (c) 2011 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.
+
+#ifndef UI_GFX_COMPOSITOR_TEST_SUITE_H_
+#define UI_GFX_COMPOSITOR_TEST_SUITE_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "base/test/test_suite.h"
+
+class CompositorTestSuite : public base::TestSuite {
+ public:
+  CompositorTestSuite(int argc, char** argv);
+
+ protected:
+  // base::TestSuite:
+  virtual void Initialize() OVERRIDE;
+  virtual void Shutdown() OVERRIDE;
+};
+
+#endif  // UI_GFX_COMPOSITOR_TEST_SUITE_H_
diff --git a/ui/ui.gyp b/ui/ui.gyp
index 273d63c..a340465 100644
--- a/ui/ui.gyp
+++ b/ui/ui.gyp
@@ -293,6 +293,8 @@
         ['use_aura==1', {
           'sources/': [
             ['exclude', 'gfx/screen_win.cc'],
+            ['exclude', 'base/win/mouse_wheel_util.cc'],
+            ['exclude', 'base/win/mouse_wheel_util.h'],            
           ],
         }],
         ['toolkit_uses_gtk == 1', {