exo: Add support for alpha_compositing interface to wayland bindings.

components/exo/surface_unittest.cc

 // 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 "base/bind.h"
 #include "components/exo/buffer.h"
 #include "components/exo/surface.h"
 #include "components/exo/test/exo_test_base.h"
 #include "components/exo/test/exo_test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 135 matching lines @@
   cc::TextureMailbox mailbox;
   std::unique_ptr<cc::SingleReleaseCallback> release_callback;
   bool rv = surface->layer()->PrepareTextureMailbox(&mailbox, &release_callback,
                                                     false);
   ASSERT_TRUE(rv);
 
   EXPECT_TRUE(mailbox.secure_output_only());
   release_callback->Run(gpu::SyncToken(), false);
 }
 
+TEST_F(SurfaceTest, SetBlendMode) {
+  gfx::Size buffer_size(1, 1);
+  std::unique_ptr<Buffer> buffer(
+      new Buffer(exo_test_helper()->CreateGpuMemoryBuffer(buffer_size)));
+  std::unique_ptr<Surface> surface(new Surface);
+
+  surface->Attach(buffer.get());
+  surface->SetBlendMode(SkXfermode::kSrc_Mode);
+  surface->Commit();
+
+  EXPECT_TRUE(surface->layer()->fills_bounds_opaquely());
+}
+
+TEST_F(SurfaceTest, SetAlpha) {
+  gfx::Size buffer_size(1, 1);
+  std::unique_ptr<Buffer> buffer(
+      new Buffer(exo_test_helper()->CreateGpuMemoryBuffer(buffer_size)));
+  std::unique_ptr<Surface> surface(new Surface);
+
+  surface->Attach(buffer.get());
+  surface->SetAlpha(0.5f);
+  surface->Commit();
+}

[Daniele Castagna, 2016/05/09 23:34:19]

Is has_external_content true? Can you check the alpha on the layer?

[reveman, 2016/05/10 14:05:19]

has_external_content is true independent of this. There's no get_alpha and I'm
not sure it's worth adding as this is just going to be used until we've switched
to cc::surfaces.

Ideally we'd have a bunch of pixel tests for exo that can be used to verify this
type of thing. I think manual testing and just exercising the API in this unit
test is sufficient for now. 

+
 TEST_F(SurfaceTest, Commit) {
   std::unique_ptr<Surface> surface(new Surface);
 
   // Calling commit without a buffer should succeed.
   surface->Commit();
 }
 
 }  // namespace
 }  // namespace exo