Add a basic NativeViewportX11 for Mojo

mojo/services/native_viewport/native_viewport_x11.cc

 // Copyright 2013 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 "mojo/services/native_viewport/native_viewport.h"
 
+#include <X11/Xlib.h>
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/message_loop/message_loop.h"
+#include "base/message_loop/message_pump_x11.h"
+#include "gpu/command_buffer/client/gl_in_process_context.h"
+#include "gpu/command_buffer/client/gles2_implementation.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/x/x11_types.h"
+
 namespace mojo {
 namespace services {
 
-class NativeViewportX11 : public NativeViewport {
+class NativeViewportX11 : public NativeViewport,
+                          public base::MessagePumpDispatcher {
  public:
   NativeViewportX11(NativeViewportDelegate* delegate)
-      : delegate_(delegate) {
+      : delegate_(delegate),
+        bounds_(10, 10, 500, 500) {
+    XDisplay* display = gfx::GetXDisplay();
+    XSetWindowAttributes swa;
+    memset(&swa, 0, sizeof(swa));
+    swa.override_redirect = False;
+    window_ = XCreateWindow(
+        display,
+        DefaultRootWindow(display),
+        bounds_.x(), bounds_.y(), bounds_.width(), bounds_.height(),
+        0,  // border width
+        CopyFromParent,  // depth
+        InputOutput,
+        CopyFromParent,  // visual
+        CWBackPixmap | CWOverrideRedirect, &swa);
+
+    base::MessagePumpX11::Current()->AddDispatcherForWindow(this, window_);
+    base::MessagePumpX11::Current()->AddDispatcherForRootWindow(this);
+
+    XMapWindow(display, window_);
+    XFlush(display);
+
+    gpu::GLInProcessContextAttribs attribs;
+    gl_context_.reset(gpu::GLInProcessContext::CreateContext(
+        false, window_, bounds_.size(), false,
+        attribs, gfx::PreferDiscreteGpu));
+    gl_context_->SetContextLostCallback(base::Bind(
+        &NativeViewportX11::OnGLContextLost, base::Unretained(this)));
+
+    delegate_->OnGLContextAvailable(gl_context_->GetImplementation());
   }
+
   virtual ~NativeViewportX11() {
+    base::MessagePumpX11::Current()->RemoveDispatcherForRootWindow(this);
+    base::MessagePumpX11::Current()->RemoveDispatcherForWindow(window_);
+
+    XDestroyWindow(gfx::GetXDisplay(), window_);
   }
 
  private:
   // Overridden from NativeViewport:
   virtual void Close() OVERRIDE {
     // TODO(beng): perform this in response to XWindow destruction.
     delegate_->OnDestroyed();
   }
 
+  // Overridden from base::MessagePumpDispatcher:
+  virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE {
+    return true;
+  }
+
+  void OnGLContextLost() {
+    gl_context_.reset();
+    delegate_->OnGLContextLost();
+  }
+
   NativeViewportDelegate* delegate_;
+  gfx::Rect bounds_;
+  XID window_;
+  scoped_ptr<gpu::GLInProcessContext> gl_context_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewportX11);
 };
 
 // static
 scoped_ptr<NativeViewport> NativeViewport::Create(
     shell::Context* context,
     NativeViewportDelegate* delegate) {
   return scoped_ptr<NativeViewport>(new NativeViewportX11(delegate)).Pass();
 }
 
 }  // namespace services
 }  // namespace mojo