Implement transform/clip support for Android WebView.

Transforms are applied above the root-layer.  I fixed LTHCommon to forward
root-layer transforms to sublayers, as the RenderSurface-based logic was previously
clearing transforms and copying over only the scale portion.

The clip rect is treated as the viewport for the purposes of DrawQuads and Renderer
(this is required to avoid awful performance when the WebView is much larger than
the screen).  Because y-flipping the clip rect depends on knowledge of the true
surface size, I also needed to add a new OutputSurface::SurfaceSize() getter and refactored
viewport size throughout the Renderers to separate render-pass draw rect, glViewport rect,
and surface size.

Scale and translate transforms work with this patch, but rotation is still broken.

New tests: LayerTreeHostCommonTest.TransformAboveRootLayer,
GLRendererTest2.ScissorAndViewportWithinNonreshapableSurface,
RendererPixelTest/2* and 3*

NOTRY=true
BUG=230463

Review URL: https://chromiumcodereview.appspot.com/15579002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@204650 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 67 insertions, 9 deletions

diff --git a/cc/test/pixel_test.cc b/cc/test/pixel_test.cc
index 0885c76..1e75156 100644
--- a/cc/test/pixel_test.cc
+++ b/cc/test/pixel_test.cc
@@ -23,12 +23,12 @@ namespace cc {
 
 class PixelTest::PixelTestRendererClient : public RendererClient {
  public:
-  explicit PixelTestRendererClient(gfx::Size device_viewport_size)
-      : device_viewport_size_(device_viewport_size) {}
+  explicit PixelTestRendererClient(gfx::Rect device_viewport)
+      : device_viewport_(device_viewport) {}
 
   // RendererClient implementation.
-  virtual gfx::Size DeviceViewportSize() const OVERRIDE {
-    return device_viewport_size_;
+  virtual gfx::Rect DeviceViewport() const OVERRIDE {
+    return device_viewport_ + test_expansion_offset_;
   }
   virtual float DeviceScaleFactor() const OVERRIDE {
     return 1.f;
@@ -51,14 +51,60 @@ class PixelTest::PixelTestRendererClient : public RendererClient {
     return true;
   }
 
+  void SetTestExpansionOffset(gfx::Vector2d test_expansion_offset) {
+    test_expansion_offset_ = test_expansion_offset;
+  }
+
  private:
-  gfx::Size device_viewport_size_;
+  gfx::Rect device_viewport_;
+  gfx::Vector2d test_expansion_offset_;
   LayerTreeSettings settings_;
 };
 
+class PixelTest::PixelTestOutputSurface : public OutputSurface {
+ public:
+  explicit PixelTestOutputSurface(
+      scoped_ptr<WebKit::WebGraphicsContext3D> context3d)
+      : OutputSurface(context3d.Pass()) {}
+  explicit PixelTestOutputSurface(
+      scoped_ptr<cc::SoftwareOutputDevice> software_device)
+      : OutputSurface(software_device.Pass()) {}
+  virtual void Reshape(gfx::Size size, float scale_factor) OVERRIDE {
+    OutputSurface::Reshape(
+        gfx::Size(size.width() + test_expansion_size_.width(),
+                  size.height() + test_expansion_size_.height()),
+        scale_factor);
+  }
+
+  void SetTestExpansionSize(gfx::Size test_expansion_size) {
+    test_expansion_size_ = test_expansion_size;
+  }
+
+ private:
+  gfx::Size test_expansion_size_;
+};
+
+class PixelTestSoftwareOutputDevice : public SoftwareOutputDevice {
+ public:
+  PixelTestSoftwareOutputDevice() {}
+  virtual void Resize(gfx::Size size) OVERRIDE {
+    SoftwareOutputDevice::Resize(
+        gfx::Size(size.width() + test_expansion_size_.width(),
+                  size.height() + test_expansion_size_.height()));
+  }
+
+  void SetTestExpansionSize(gfx::Size test_expansion_size) {
+    test_expansion_size_ = test_expansion_size;
+  }
+
+ private:
+  gfx::Size test_expansion_size_;
+};
+
 PixelTest::PixelTest()
     : device_viewport_size_(gfx::Size(200, 200)),
-      fake_client_(new PixelTestRendererClient(device_viewport_size_)) {}
+      fake_client_(
+          new PixelTestRendererClient(gfx::Rect(device_viewport_size_))) {}
 
 PixelTest::~PixelTest() {}
 
@@ -125,7 +171,7 @@ void PixelTest::SetUpGLRenderer(bool use_skia_gpu_backend) {
   scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl> context3d(
       WebGraphicsContext3DInProcessCommandBufferImpl::CreateOffscreenContext(
           WebKit::WebGraphicsContext3D::Attributes()));
-  output_surface_.reset(new OutputSurface(
+  output_surface_.reset(new PixelTestOutputSurface(
       context3d.PassAs<WebKit::WebGraphicsContext3D>()));
   resource_provider_ = ResourceProvider::Create(output_surface_.get(), 0);
   renderer_ = GLRenderer::Create(fake_client_.get(),
@@ -140,11 +186,23 @@ void PixelTest::SetUpGLRenderer(bool use_skia_gpu_backend) {
   resource_provider_->set_offscreen_context_provider(offscreen_contexts);
 }
 
+void PixelTest::ForceExpandedViewport(gfx::Size surface_expansion,
+                                      gfx::Vector2d viewport_offset) {
+  static_cast<PixelTestOutputSurface*>(output_surface_.get())
+      ->SetTestExpansionSize(surface_expansion);
+  fake_client_->SetTestExpansionOffset(viewport_offset);
+  SoftwareOutputDevice* device = output_surface_->software_device();
+  if (device) {
+    static_cast<PixelTestSoftwareOutputDevice*>(device)
+        ->SetTestExpansionSize(surface_expansion);
+  }
+}
+
 void PixelTest::SetUpSoftwareRenderer() {
   CHECK(fake_client_);
 
-  scoped_ptr<SoftwareOutputDevice> device(new SoftwareOutputDevice());
-  output_surface_.reset(new OutputSurface(device.Pass()));
+  scoped_ptr<SoftwareOutputDevice> device(new PixelTestSoftwareOutputDevice());
+  output_surface_.reset(new PixelTestOutputSurface(device.Pass()));
   resource_provider_ = ResourceProvider::Create(output_surface_.get(), 0);
   renderer_ = SoftwareRenderer::Create(
       fake_client_.get(),