Wire up windowless plugins. Mostly Mac related, some cross

platform aspects.
BUG=10809
TEST=none

Review URL: http://codereview.chromium.org/113637

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20453 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 159 insertions, 29 deletions

diff --git a/chrome/plugin/plugin_main.cc b/chrome/plugin/plugin_main.cc
index fb8880f..4cc7911 100644
--- a/chrome/plugin/plugin_main.cc
+++ b/chrome/plugin/plugin_main.cc
@@ -27,6 +27,47 @@
 #include "base/global_descriptors_posix.h"
 #endif
 
+#if defined(OS_MACOSX)
+
+// To support Mac NPAPI plugins that use the Carbon event model (i.e., most
+// shipping plugins for MacOS X 10.5 and earlier), we need some way for the
+// Carbon event dispatcher to run, even though the plugin host process itself
+// does not use Carbon events.  Rather than give control to the standard
+// Carbon event loop, we schedule a periodic task on the main thread which
+// empties the Carbon event queue every 20ms (chosen to match how often Safari
+// does the equivalent operation).  This allows plugins to receive idle events
+// and schedule Carbon timers without swamping the CPU.  If, in the future,
+// we remove support for the Carbon event model and only support the Cocoa
+// event model, this can be removed.  Note that this approach does not install
+// standard application event handlers for the menubar, AppleEvents, and so on.
+// This is intentional, since the plugin process is not actually an application
+// with its own UI elements--all rendering and event handling happens via IPC
+// to the renderer process which invoked it.
+
+namespace {
+
+const int kPluginUpdateIntervalMs = 20; // 20ms = 50Hz
+
+void PluginCarbonEventTask() {
+  EventRef theEvent;
+  EventTargetRef theTarget;
+
+  theTarget = GetEventDispatcherTarget();
+
+  // Dispatch any pending events. but do not block if there are no events.
+  while (ReceiveNextEvent(0, NULL, kEventDurationNoWait,
+                          true, &theEvent) == noErr) {
+    SendEventToEventTarget (theEvent, theTarget);
+    ReleaseEvent(theEvent);
+  }
+
+  MessageLoop::current()->PostDelayedTask(FROM_HERE,
+      NewRunnableFunction(PluginCarbonEventTask), kPluginUpdateIntervalMs);
+}
+
+}
+#endif
+
 // main() routine for running as the plugin process.
 int PluginMain(const MainFunctionParams& parameters) {
   // The main thread of the plugin services IO.
@@ -37,9 +78,9 @@ int PluginMain(const MainFunctionParams& parameters) {
   // Initialize the SystemMonitor
   base::SystemMonitor::Start();
 
-#if defined(OS_WIN)
   const CommandLine& parsed_command_line = parameters.command_line_;
 
+#if defined(OS_WIN)
   sandbox::TargetServices* target_services =
       parameters.sandbox_info_.TargetServices();
 
@@ -59,16 +100,32 @@ int PluginMain(const MainFunctionParams& parameters) {
       DCHECK(sandbox_test_module);
     }
   }
-
+#endif
   if (parsed_command_line.HasSwitch(switches::kPluginStartupDialog)) {
+#if defined(OS_WIN)
     std::wstring title = chrome::kBrowserAppName;
     title += L" plugin";  // makes attaching to process easier
     win_util::MessageBox(NULL, L"plugin starting...", title,
                          MB_OK | MB_SETFOREGROUND);
-  }
+#elif defined(OS_MACOSX)
+    // TODO(playmobil): In the long term, overriding this flag doesn't seem
+    // right, either use our own flag or open a dialog we can use.
+    // This is just to ease debugging in the interim.
+    LOG(WARNING) << "Plugin ("
+    << getpid()
+    << ") paused waiting for debugger to attach @ pid";
+    pause();
 #else
   NOTIMPLEMENTED() << " non-windows startup, plugin startup dialog etc.";
 #endif
+  }
+
+#if defined(OS_MACOSX)
+  // Spin off a consumer for the native (Carbon) event stream so
+  // that plugin timers, event handlers, etc. will work properly.
+  MessageLoop::current()->PostDelayedTask(FROM_HERE,
+      NewRunnableFunction(PluginCarbonEventTask), kPluginUpdateIntervalMs);
+#endif
 
   {
     ChildProcess plugin_process(new PluginThread());
diff --git a/chrome/plugin/webplugin_delegate_stub.cc b/chrome/plugin/webplugin_delegate_stub.cc
index 542f0a3..a8a42b0 100644
--- a/chrome/plugin/webplugin_delegate_stub.cc
+++ b/chrome/plugin/webplugin_delegate_stub.cc
@@ -272,11 +272,11 @@ void WebPluginDelegateStub::OnPrint(base::SharedMemoryHandle* shared_memory,
 void WebPluginDelegateStub::OnUpdateGeometry(
     const gfx::Rect& window_rect,
     const gfx::Rect& clip_rect,
-    const TransportDIB::Id& windowless_buffer_id,
-    const TransportDIB::Id& background_buffer_id) {
+    const TransportDIB::Handle& windowless_buffer,
+    const TransportDIB::Handle& background_buffer) {
   webplugin_->UpdateGeometry(
       window_rect, clip_rect,
-      windowless_buffer_id, background_buffer_id);
+      windowless_buffer, background_buffer);
 }
 
 void WebPluginDelegateStub::OnGetPluginScriptableObject(int* route_id,
diff --git a/chrome/plugin/webplugin_delegate_stub.h b/chrome/plugin/webplugin_delegate_stub.h
index 10ac7a4..15b88a8 100644
--- a/chrome/plugin/webplugin_delegate_stub.h
+++ b/chrome/plugin/webplugin_delegate_stub.h
@@ -71,8 +71,8 @@ class WebPluginDelegateStub : public IPC::Channel::Listener,
 
   void OnUpdateGeometry(const gfx::Rect& window_rect,
                         const gfx::Rect& clip_rect,
-                        const TransportDIB::Id& windowless_buffer,
-                        const TransportDIB::Id& background_buffer);
+                        const TransportDIB::Handle& windowless_buffer,
+                        const TransportDIB::Handle& background_buffer);
   void OnGetPluginScriptableObject(int* route_id, intptr_t* npobject_ptr);
   void OnSendJavaScriptStream(const std::string& url,
                               const std::wstring& result,
diff --git a/chrome/plugin/webplugin_proxy.cc b/chrome/plugin/webplugin_proxy.cc
index b2fe778..94f2b2f 100644
--- a/chrome/plugin/webplugin_proxy.cc
+++ b/chrome/plugin/webplugin_proxy.cc
@@ -369,11 +369,16 @@ void WebPluginProxy::Paint(const gfx::Rect& rect) {
 #if defined(OS_WIN)
   if (!windowless_hdc_)
     return;
+#elif defined(OS_MACOSX)
+  if (!windowless_context_.get())
+    return;
+#endif
 
   // Clear the damaged area so that if the plugin doesn't paint there we won't
   // end up with the old values.
   gfx::Rect offset_rect = rect;
   offset_rect.Offset(delegate_->GetRect().origin());
+#if defined(OS_WIN)
   if (!background_hdc_) {
     FillRect(windowless_hdc_, &offset_rect.ToRECT(),
         static_cast<HBRUSH>(GetStockObject(BLACK_BRUSH)));
@@ -393,6 +398,22 @@ void WebPluginProxy::Paint(const gfx::Rect& rect) {
 
   SelectClipRgn(windowless_hdc_, NULL);
   DeleteObject(clip_region);
+#elif defined(OS_MACOSX)
+  CGContextSaveGState(windowless_context_);
+  if (!background_context_.get()) {
+    CGContextSetFillColorWithColor(windowless_context_,
+                                   CGColorGetConstantColor(kCGColorWhite));
+    CGContextFillRect(windowless_context_, rect.ToCGRect());
+  } else {
+    scoped_cftyperef<CGImageRef> image(
+        CGBitmapContextCreateImage(background_context_));
+    scoped_cftyperef<CGImageRef> sub_image(
+        CGImageCreateWithImageInRect(image, rect.ToCGRect()));
+    CGContextDrawImage(background_context_, rect.ToCGRect(), sub_image);
+  }
+  CGContextClipToRect(windowless_context_, rect.ToCGRect());
+  delegate_->Paint(windowless_context_, rect);
+  CGContextRestoreGState(windowless_context_);
 #else
   // TODO(port): windowless painting.
   NOTIMPLEMENTED();
@@ -402,22 +423,21 @@ void WebPluginProxy::Paint(const gfx::Rect& rect) {
 void WebPluginProxy::UpdateGeometry(
     const gfx::Rect& window_rect,
     const gfx::Rect& clip_rect,
-    const TransportDIB::Id& windowless_buffer_id,
-    const TransportDIB::Id& background_buffer_id) {
-  // TODO(port): this isn't correct usage of a TransportDIB; for now,
-  // the caller temporarly just stuffs the handle into the HANDLE
-  // field of the TransportDIB::Id so it should behave like the older
-  // code.
+    const TransportDIB::Handle& windowless_buffer,
+    const TransportDIB::Handle& background_buffer) {
   gfx::Rect old = delegate_->GetRect();
   gfx::Rect old_clip_rect = delegate_->GetClipRect();
 
   delegate_->UpdateGeometry(window_rect, clip_rect);
-#if defined(OS_WIN)
   bool moved = old.x() != window_rect.x() || old.y() != window_rect.y();
-  if (windowless_buffer_id.handle) {
+#if defined(OS_MACOSX)
+  if (windowless_buffer.fd > 0) {
+#else
+  if (windowless_buffer) {
+#endif
     // The plugin's rect changed, so now we have a new buffer to draw into.
-    SetWindowlessBuffer(windowless_buffer_id.handle,
-                        background_buffer_id.handle);
+    SetWindowlessBuffer(windowless_buffer,
+                        background_buffer);
   } else if (moved) {
     // The plugin moved, so update our world transform.
     UpdateTransform();
@@ -428,15 +448,12 @@ void WebPluginProxy::UpdateGeometry(
       old_clip_rect.IsEmpty() && !damaged_rect_.IsEmpty()) {
     InvalidateRect(damaged_rect_);
   }
-#else
-  NOTIMPLEMENTED();
-#endif
 }
 
 #if defined(OS_WIN)
 void WebPluginProxy::SetWindowlessBuffer(
-    const base::SharedMemoryHandle& windowless_buffer,
-    const base::SharedMemoryHandle& background_buffer) {
+    const TransportDIB::Handle& windowless_buffer,
+    const TransportDIB::Handle& background_buffer) {
   // Convert the shared memory handle to a handle that works in our process,
   // and then use that to create an HDC.
   ConvertBuffer(windowless_buffer,
@@ -501,6 +518,54 @@ void WebPluginProxy::UpdateTransform() {
   xf.eM22 = 1;
   SetWorldTransform(windowless_hdc_, &xf);
 }
+#elif defined(OS_MACOSX)
+void WebPluginProxy::UpdateTransform() {
+  NOTIMPLEMENTED();
+}
+
+void WebPluginProxy::SetWindowlessBuffer(
+    const TransportDIB::Handle& windowless_buffer,
+    const TransportDIB::Handle& background_buffer) {
+  // Convert the shared memory handle to a handle that works in our process,
+  // and then use that to create a CGContextRef.
+  windowless_dib_.reset(TransportDIB::Map(windowless_buffer));
+  background_dib_.reset(TransportDIB::Map(background_buffer));
+  scoped_cftyperef<CGColorSpaceRef> rgb_colorspace(
+      CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB));
+  windowless_context_.reset(CGBitmapContextCreate(
+      windowless_dib_->memory(),
+      delegate_->GetRect().width(),
+      delegate_->GetRect().height(),
+      8, 4 * delegate_->GetRect().width(),
+      rgb_colorspace,
+      kCGImageAlphaPremultipliedFirst |
+      kCGBitmapByteOrder32Host));
+  CGContextTranslateCTM(windowless_context_, 0, delegate_->GetRect().height());
+  CGContextScaleCTM(windowless_context_, 1, -1);
+  if (background_dib_.get()) {
+    background_context_.reset(CGBitmapContextCreate(
+        background_dib_->memory(),
+        delegate_->GetRect().width(),
+        delegate_->GetRect().height(),
+        8, 4 * delegate_->GetRect().width(),
+        rgb_colorspace,
+        kCGImageAlphaPremultipliedFirst |
+        kCGBitmapByteOrder32Host));
+    CGContextTranslateCTM(background_context_, 0,
+                          delegate_->GetRect().height());
+    CGContextScaleCTM(background_context_, 1, -1);
+  }
+}
+#elif defined (OS_LINUX)
+void WebPluginProxy::UpdateTransform() {
+  NOTIMPLEMENTED();
+}
+
+void WebPluginProxy::SetWindowlessBuffer(
+    const TransportDIB::Handle& windowless_buffer,
+    const TransportDIB::Handle& background_buffer) {
+  NOTIMPLEMENTED();
+}
 #endif
 
 void WebPluginProxy::CancelDocumentLoad() {
diff --git a/chrome/plugin/webplugin_proxy.h b/chrome/plugin/webplugin_proxy.h
index 103be5c..a55a3da2 100644
--- a/chrome/plugin/webplugin_proxy.h
+++ b/chrome/plugin/webplugin_proxy.h
@@ -9,6 +9,9 @@
 
 #include "base/hash_tables.h"
 #include "base/ref_counted.h"
+#if defined(OS_MACOSX)
+#include "base/scoped_cftyperef.h"
+#endif
 #include "base/scoped_handle.h"
 #include "base/scoped_ptr.h"
 #include "base/shared_memory.h"
@@ -104,8 +107,8 @@ class WebPluginProxy : public WebPlugin {
 
   void UpdateGeometry(const gfx::Rect& window_rect,
                       const gfx::Rect& clip_rect,
-                      const TransportDIB::Id& windowless_buffer,
-                      const TransportDIB::Id& background_buffer);
+                      const TransportDIB::Handle& windowless_buffer,
+                      const TransportDIB::Handle& background_buffer);
 
   void CancelDocumentLoad();
 
@@ -129,22 +132,22 @@ class WebPluginProxy : public WebPlugin {
   // Handler for sending over the paint event to the plugin.
   void OnPaint(const gfx::Rect& damaged_rect);
 
-#if defined(OS_WIN)
   // Updates the shared memory section where windowless plugins paint.
-  void SetWindowlessBuffer(const base::SharedMemoryHandle& windowless_buffer,
-                           const base::SharedMemoryHandle& background_buffer);
+  void SetWindowlessBuffer(const TransportDIB::Handle& windowless_buffer,
+                           const TransportDIB::Handle& background_buffer);
 
+#if defined(OS_WIN)
   // Converts a shared memory section handle from the renderer process into a
   // bitmap and hdc that are mapped to this process.
   void ConvertBuffer(const base::SharedMemoryHandle& buffer,
                      ScopedHandle* shared_section,
                      ScopedBitmap* bitmap,
                      ScopedHDC* hdc);
+#endif
 
   // Called when a plugin's origin moves, so that we can update the world
   // transform of the local HDC.
   void UpdateTransform();
-#endif
 
   typedef base::hash_map<int, WebPluginResourceClient*> ResourceClientMap;
   ResourceClientMap resource_clients_;
@@ -174,6 +177,11 @@ class WebPluginProxy : public WebPlugin {
   ScopedHandle background_shared_section_;
   ScopedBitmap background_bitmap_;
   ScopedHDC background_hdc_;
+#elif defined(OS_MACOSX)
+  scoped_ptr<TransportDIB> windowless_dib_;
+  scoped_ptr<TransportDIB> background_dib_;
+  scoped_cftyperef<CGContextRef> windowless_context_;
+  scoped_cftyperef<CGContextRef> background_context_;
 #endif
 
   ScopedRunnableMethodFactory<WebPluginProxy> runnable_method_factory_;