Adds support for hittesting points on surface quads

cc/surfaces/surface_hittest_unittest.cc

Index: cc/surfaces/surface_hittest_unittest.cc
diff --git a/cc/surfaces/surface_hittest_unittest.cc b/cc/surfaces/surface_hittest_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0929259c416813238a0082522853e8860590c6d5
--- /dev/null
+++ b/cc/surfaces/surface_hittest_unittest.cc
@@ -0,0 +1,168 @@
+// Copyright 2015 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 "cc/output/compositor_frame.h"
+#include "cc/output/delegated_frame_data.h"
+#include "cc/quads/render_pass.h"
+#include "cc/quads/render_pass_id.h"
+#include "cc/quads/solid_color_draw_quad.h"
+#include "cc/quads/surface_draw_quad.h"
+#include "cc/surfaces/surface.h"
+#include "cc/surfaces/surface_factory.h"
+#include "cc/surfaces/surface_factory_client.h"
+#include "cc/surfaces/surface_hittest.h"
+#include "cc/surfaces/surface_id_allocator.h"
+#include "cc/surfaces/surface_manager.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace cc {
+
+class EmptySurfaceFactoryClient : public SurfaceFactoryClient {
+ public:
+  void ReturnResources(const ReturnedResourceArray& resources) override {}
+};
+
+TEST(SurfaceHittestTest, Hittest_SingleSurface) {
+  SurfaceManager manager;
+  EmptySurfaceFactoryClient client;
+  SurfaceFactory factory(&manager, &client);
+  SurfaceIdAllocator root_allocator(2);
+
+  // Creates a root surface.
+  SurfaceId root_surface_id = root_allocator.GenerateId();
+  factory.Create(root_surface_id);
+  gfx::Rect rect(300, 300);
+  RenderPassId id(1, 1);
+  scoped_ptr<RenderPass> pass = RenderPass::Create();
+  pass->SetNew(id, rect, rect, gfx::Transform());
+  scoped_ptr<DelegatedFrameData> delegated_frame_data(new DelegatedFrameData);
+  delegated_frame_data->render_pass_list.push_back(pass.Pass());
+  scoped_ptr<CompositorFrame> root_frame(new CompositorFrame);
+  root_frame->delegated_frame_data = delegated_frame_data.Pass();
+  factory.SubmitFrame(root_surface_id, root_frame.Pass(),
+                      SurfaceFactory::DrawCallback());
+
+  {
+    SurfaceHittest hittest(&manager);
+    gfx::Point transformed_point;
+    EXPECT_EQ(root_surface_id,
+              hittest.Hittest(root_surface_id, gfx::Point(100, 100),
+                              &transformed_point));
+    EXPECT_EQ(gfx::Point(100, 100), transformed_point);
+  }
+
+  factory.Destroy(root_surface_id);
+}
+
+TEST(SurfaceHittestTest, Hittest_ChildSurface) {
+  SurfaceManager manager;
+  EmptySurfaceFactoryClient client;
+  SurfaceFactory factory(&manager, &client);
+  SurfaceIdAllocator root_allocator(2);
+  SurfaceIdAllocator child_allocator(3);
+
+  SurfaceId root_surface_id = root_allocator.GenerateId();
+  SurfaceId child_surface_id = child_allocator.GenerateId();
+  gfx::Size root_size(300, 300);
+  gfx::Rect root_rect(root_size);
+  gfx::Size child_size(200, 200);
+  gfx::Rect child_rect(child_size);
+  gfx::Rect child_solid_quad_size(100, 100);
+  gfx::Rect child_solid_quad_rect(child_solid_quad_size);
+
+  // Creates a root surface.
+  factory.Create(root_surface_id);
+  RenderPassId root_id(1, 1);
+  scoped_ptr<RenderPass> root_pass = RenderPass::Create();
+  root_pass->SetNew(root_id, root_rect, root_rect, gfx::Transform());
+
+  // Add a reference to the child surface on the root surface.
+  SharedQuadState* root_shared_state =
+      root_pass->CreateAndAppendSharedQuadState();
+  root_shared_state->SetAll(gfx::Transform(1.0f, 0.0f, 0.0f, 50.0f,
+                                           0.0f, 1.0f, 0.0f, 50.0f,
+                                           0.0f, 0.0f, 1.0f, 0.0f,
+                                           0.0f, 0.0f, 0.0f, 1.0f),
+                            root_size, root_rect, root_rect, false, 1.0f,
+                            SkXfermode::kSrcOver_Mode, 0);
+  SurfaceDrawQuad* surface_quad =
+      root_pass->CreateAndAppendDrawQuad<SurfaceDrawQuad>();
+  surface_quad->SetNew(root_pass->shared_quad_state_list.back(), child_rect,
+                       child_rect, child_surface_id);
+
+  // Submit the root frame.
+  scoped_ptr<DelegatedFrameData> root_delegated_frame_data(
+      new DelegatedFrameData);
+  root_delegated_frame_data->render_pass_list.push_back(root_pass.Pass());
+  scoped_ptr<CompositorFrame> root_frame(new CompositorFrame);
+  root_frame->delegated_frame_data = root_delegated_frame_data.Pass();
+  factory.SubmitFrame(root_surface_id, root_frame.Pass(),
+                      SurfaceFactory::DrawCallback());
+
+  // Creates a child surface.
+  factory.Create(child_surface_id);
+  RenderPassId child_id(1, 1);
+  scoped_ptr<RenderPass> child_pass = RenderPass::Create();
+  child_pass->SetNew(child_id, child_rect, child_rect, gfx::Transform());
+
+  // Add a solid quad in the child surface.
+  SharedQuadState* child_shared_state =
+      child_pass->CreateAndAppendSharedQuadState();
+  child_shared_state->SetAll(gfx::Transform(1.0f, 0.0f, 0.0f, 50.0f,
+                                            0.0f, 1.0f, 0.0f, 50.0f,
+                                            0.0f, 0.0f, 1.0f, 0.0f,
+                                            0.0f, 0.0f, 0.0f, 1.0f),
+                             root_size, root_rect, root_rect, false, 1.0f,
+                             SkXfermode::kSrcOver_Mode, 0);
+  SolidColorDrawQuad* color_quad =
+      child_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
+  color_quad->SetNew(child_pass->shared_quad_state_list.back(),
+                     child_solid_quad_rect, child_solid_quad_rect,
+                     SK_ColorYELLOW, false);
+
+  // Submit the frame.
+  scoped_ptr<DelegatedFrameData> child_delegated_frame_data(
+      new DelegatedFrameData);
+  child_delegated_frame_data->render_pass_list.push_back(child_pass.Pass());
+  scoped_ptr<CompositorFrame> child_frame(new CompositorFrame);
+  child_frame->delegated_frame_data = child_delegated_frame_data.Pass();
+  factory.SubmitFrame(child_surface_id, child_frame.Pass(),
+                      SurfaceFactory::DrawCallback());
+
+  {
+    SurfaceHittest hittest(&manager);
+    gfx::Point transformed_point;
+    EXPECT_EQ(root_surface_id,
+              hittest.Hittest(root_surface_id, gfx::Point(10, 10),
+                              &transformed_point));
+    EXPECT_EQ(gfx::Point(10, 10), transformed_point);
+    EXPECT_EQ(root_surface_id,
+              hittest.Hittest(root_surface_id, gfx::Point(99, 99),
+                              &transformed_point));
+    EXPECT_EQ(gfx::Point(99, 99), transformed_point);
+    EXPECT_EQ(child_surface_id,
+              hittest.Hittest(root_surface_id, gfx::Point(100, 100),
+                              &transformed_point));
+    EXPECT_EQ(gfx::Point(50, 50), transformed_point);
+    EXPECT_EQ(child_surface_id,
+              hittest.Hittest(root_surface_id, gfx::Point(199, 199),
+                              &transformed_point));
+    EXPECT_EQ(gfx::Point(149, 149), transformed_point);
+    EXPECT_EQ(root_surface_id,
+              hittest.Hittest(root_surface_id, gfx::Point(200, 200),
+                              &transformed_point));
+    EXPECT_EQ(gfx::Point(200, 200), transformed_point);
+    EXPECT_EQ(root_surface_id,
+              hittest.Hittest(root_surface_id, gfx::Point(290, 290),
+                              &transformed_point));
+    EXPECT_EQ(gfx::Point(290, 290), transformed_point);
+  }
+
+  factory.Destroy(root_surface_id);
+  factory.Destroy(child_surface_id);
+}
+
+}  // namespace cc