compositor_unittests target is unimplmented on Mac

ui/gfx/compositor/test_compositor_host_mac.mm

+// 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"
+
+#import <AppKit/NSApplication.h>
+#import <AppKit/NSOpenGL.h>
+#import <AppKit/NSView.h>
+#import <AppKit/NSWindow.h>
+#import <Foundation/NSAutoreleasePool.h>
+
+#include "base/compiler_specific.h"
+#include "ui/gfx/compositor/compositor.h"
+#include "ui/gfx/rect.h"
+
+// AcceleratedTestView provides an NSView class that delegates drawing to a
+// ui::Compositor delegate, setting up the NSOpenGLContext as required.
+@interface AcceleratedTestView : NSView {
+  scoped_refptr<ui::Compositor> compositor_;
+}
+// Designated initializer.
+-(id)init;
+-(void)setCompositor:(scoped_refptr<ui::Compositor>)compositor;
+@end
+
+@implementation AcceleratedTestView
+-(id)init {
+  // The frame will be resized when reparented into the window's view hierarchy.
+  self = [super initWithFrame:NSZeroRect];
+  return self;
+}
+
+-(void)setCompositor:(scoped_refptr<ui::Compositor>)compositor {
+  compositor_ = compositor;
+}
+
+- (void)drawRect:(NSRect)rect {
+  DCHECK(compositor_) << "Drawing with no compositor set.";
+
+  NSOpenGLContext* context = [NSOpenGLContext currentContext];
+  [context setView:self];

[Ken Russell (switch to Gerrit), 2011/11/17 22:28:18]

The call to setView belongs in GLContextNSView::MakeCurrent, before making the
OpenGL context current. The surface should be fetched from the passed GLSurface
(downcast to a GLSurfaceNSView). This is the contract of MakeCurrent and will
make this work the same as on other platforms. As a bonus, you won't have to
touch the NSOpenGLContext here.

[dhollowa, 2011/11/18 00:50:37]

Done.  Thanks, ya, that makes sense.  The only complication is that
GLContext::MakeCurrent can be called prior to the view being parented, and thus
not a valid "drawable".  Once the view is parented (has a parent window that is)
it becomes a valid drawable, so I test for this.

+  compositor_->Draw(false);
+}
+@end
+
+namespace ui {
+
+// Tests that use Objective-C memory semantics need to have a top-level
+// NSAutoreleasePool set up and initialized prior to execution and drained upon
+// exit.  The tests will leak otherwise.
+class FoundationHost {
+ protected:
+  FoundationHost() {
+    pool_ = [[NSAutoreleasePool alloc] init];
+  }
+  virtual ~FoundationHost() {
+    [pool_ drain];
+  }
+
+ private:
+  NSAutoreleasePool* pool_;
+  DISALLOW_COPY_AND_ASSIGN(FoundationHost);
+};
+
+// Tests that use the AppKit framework need to have the NSApplication
+// initialized prior to doing anything with display objects such as windows,
+// views, or controls.
+class AppKitHost : public FoundationHost {
+ protected:
+  AppKitHost() {
+    [NSApplication sharedApplication];
+  }
+  virtual ~AppKitHost() {
+  }
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AppKitHost);
+};
+
+// TestCompositorHostMac provides a window surface and a coordinated compositor
+// for use in the compositor unit tests.
+class TestCompositorHostMac : public TestCompositorHost,
+                              public CompositorDelegate,
+                              public AppKitHost {
+ public:
+  TestCompositorHostMac(const gfx::Rect& bounds);
+  virtual ~TestCompositorHostMac();
+
+ private:
+  // TestCompositorHost:
+  virtual void Show() OVERRIDE;
+  virtual ui::Compositor* GetCompositor() OVERRIDE;
+
+  // CompositorDelegate:
+  virtual void ScheduleDraw() OVERRIDE;
+
+  gfx::Rect bounds_;
+  scoped_refptr<ui::Compositor> compositor_;
+
+  // Owned.  Released when window is closed.
+  NSWindow* window_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestCompositorHostMac);
+};
+
+TestCompositorHostMac::TestCompositorHostMac(const gfx::Rect& bounds)
+    : bounds_(bounds), window_(nil) {
+}
+
+TestCompositorHostMac::~TestCompositorHostMac() {
+  [window_ orderOut:nil];
+  [window_ close];
+}
+
+void TestCompositorHostMac::Show() {
+  DCHECK(!window_);
+  window_ = [[NSWindow alloc]
+                initWithContentRect:NSMakeRect(bounds_.x(),
+                                               bounds_.y(),
+                                               bounds_.width(),
+                                               bounds_.height())
+                          styleMask:NSBorderlessWindowMask
+                            backing:NSBackingStoreBuffered
+                              defer:NO];
+  AcceleratedTestView* view = [[[AcceleratedTestView alloc] init] autorelease];
+  compositor_ = ui::Compositor::Create(this, view, bounds_.size());
+  [view setCompositor:compositor_];
+  [window_ setContentView:view];
+  [window_ orderFront:nil];
+}
+
+ui::Compositor* TestCompositorHostMac::GetCompositor() {
+  return compositor_;
+}
+
+void TestCompositorHostMac::ScheduleDraw() {
+  if (!compositor_)
+    return;
+
+  // Force display now.
+  [window_ display];
+}
+
+// static
+TestCompositorHost* TestCompositorHost::Create(const gfx::Rect& bounds) {
+  return new TestCompositorHostMac(bounds);
+}
+
+}  // namespace ui