1 files changed, 203 insertions, 0 deletions
diff --git a/ppapi/utility/graphics/paint_manager.cc b/ppapi/utility/graphics/paint_manager.cc
new file mode 100644
index 0000000..1141ac6
--- /dev/null
+++ b/ppapi/utility/graphics/paint_manager.cc
@@ -0,0 +1,203 @@
+// 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 "ppapi/utility/graphics/paint_manager.h"
+
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/logging.h"
+#include "ppapi/cpp/module.h"
+
+namespace pp {
+
+PaintManager::PaintManager()
+    : instance_(NULL),
+      client_(NULL),
+      is_always_opaque_(false),
+      callback_factory_(NULL),
+      manual_callback_pending_(false),
+      flush_pending_(false),
+      has_pending_resize_(false) {
+  // Set the callback object outside of the initializer list to avoid a
+  // compiler warning about using "this" in an initializer list.
+  callback_factory_.Initialize(this);
+}
+
+PaintManager::PaintManager(Instance* instance,
+                           Client* client,
+                           bool is_always_opaque)
+    : instance_(instance),
+      client_(client),
+      is_always_opaque_(is_always_opaque),
+      callback_factory_(NULL),
+      manual_callback_pending_(false),
+      flush_pending_(false),
+      has_pending_resize_(false) {
+  // Set the callback object outside of the initializer list to avoid a
+  // compiler warning about using "this" in an initializer list.
+  callback_factory_.Initialize(this);
+
+  // You can not use a NULL client pointer.
+  PP_DCHECK(client);
+}
+
+PaintManager::~PaintManager() {
+}
+
+void PaintManager::Initialize(Instance* instance,
+                              Client* client,
+                              bool is_always_opaque) {
+  PP_DCHECK(!instance_ && !client_);  // Can't initialize twice.
+  instance_ = instance;
+  client_ = client;
+  is_always_opaque_ = is_always_opaque;
+}
+
+void PaintManager::SetSize(const Size& new_size) {
+  if (GetEffectiveSize() == new_size)
+    return;
+
+  has_pending_resize_ = true;
+  pending_size_ = new_size;
+
+  Invalidate();
+}
+
+void PaintManager::Invalidate() {
+  // You must call SetSize before using.
+  PP_DCHECK(!graphics_.is_null() || has_pending_resize_);
+
+  EnsureCallbackPending();
+  aggregator_.InvalidateRect(Rect(GetEffectiveSize()));
+}
+
+void PaintManager::InvalidateRect(const Rect& rect) {
+  // You must call SetSize before using.
+  PP_DCHECK(!graphics_.is_null() || has_pending_resize_);
+
+  // Clip the rect to the device area.
+  Rect clipped_rect = rect.Intersect(Rect(GetEffectiveSize()));
+  if (clipped_rect.IsEmpty())
+    return;  // Nothing to do.
+
+  EnsureCallbackPending();
+  aggregator_.InvalidateRect(clipped_rect);
+}
+
+void PaintManager::ScrollRect(const Rect& clip_rect, const Point& amount) {
+  // You must call SetSize before using.
+  PP_DCHECK(!graphics_.is_null() || has_pending_resize_);
+
+  EnsureCallbackPending();
+  aggregator_.ScrollRect(clip_rect, amount);
+}
+
+Size PaintManager::GetEffectiveSize() const {
+  return has_pending_resize_ ? pending_size_ : graphics_.size();
+}
+
+void PaintManager::EnsureCallbackPending() {
+  // The best way for us to do the next update is to get a notification that
+  // a previous one has completed. So if we're already waiting for one, we
+  // don't have to do anything differently now.
+  if (flush_pending_)
+    return;
+
+  // If no flush is pending, we need to do a manual call to get back to the
+  // main thread. We may have one already pending, or we may need to schedule.
+  if (manual_callback_pending_)
+    return;
+
+  Module::Get()->core()->CallOnMainThread(
+      0,
+      callback_factory_.NewCallback(&PaintManager::OnManualCallbackComplete),
+      0);
+  manual_callback_pending_ = true;
+}
+
+void PaintManager::DoPaint() {
+  PP_DCHECK(aggregator_.HasPendingUpdate());
+
+  // Make a copy of the pending update and clear the pending update flag before
+  // actually painting. A plugin might cause invalidates in its Paint code, and
+  // we want those to go to the *next* paint.
+  PaintAggregator::PaintUpdate update = aggregator_.GetPendingUpdate();
+  aggregator_.ClearPendingUpdate();
+
+  // Apply any pending resize. Setting the graphics to this class must happen
+  // before asking the plugin to paint in case it requests the Graphics2D during
+  // painting. However, the bind must not happen until afterward since we don't
+  // want to have an unpainted device bound. The needs_binding flag tells us
+  // whether to do this later.
+  bool needs_binding = false;
+  if (has_pending_resize_) {
+    graphics_ = Graphics2D(instance_, pending_size_, is_always_opaque_);
+    needs_binding = true;
+
+    // Since we're binding a new one, all of the callbacks have been canceled.
+    manual_callback_pending_ = false;
+    flush_pending_ = false;
+    callback_factory_.CancelAll();
+
+    // This must be cleared before calling into the plugin since it may do
+    // additional invalidation or sizing operations.
+    has_pending_resize_ = false;
+    pending_size_ = Size();
+  }
+
+  // Apply any scroll before asking the client to paint.
+  if (update.has_scroll)
+    graphics_.Scroll(update.scroll_rect, update.scroll_delta);
+
+  if (client_->OnPaint(graphics_, update.paint_rects, update.paint_bounds)) {
+    // Something was painted, schedule a flush.
+    int32_t result = graphics_.Flush(
+        callback_factory_.NewOptionalCallback(&PaintManager::OnFlushComplete));
+
+    // If you trigger this assertion, then your plugin has called Flush()
+    // manually. When using the PaintManager, you should not call Flush, it
+    // will handle that for you because it needs to know when it can do the
+    // next paint by implementing the flush callback.
+    //
+    // Another possible cause of this assertion is re-using devices. If you
+    // use one device, swap it with another, then swap it back, we won't know
+    // that we've already scheduled a Flush on the first device. It's best to
+    // not re-use devices in this way.
+    PP_DCHECK(result != PP_ERROR_INPROGRESS);
+
+    if (result == PP_OK_COMPLETIONPENDING) {
+      flush_pending_ = true;
+    } else {
+      PP_DCHECK(result == PP_OK);  // Catch all other errors in debug mode.
+    }
+  }
+
+  if (needs_binding)
+    instance_->BindGraphics(graphics_);
+}
+
+void PaintManager::OnFlushComplete(int32_t) {
+  PP_DCHECK(flush_pending_);
+  flush_pending_ = false;
+
+  // If more paints were enqueued while we were waiting for the flush to
+  // complete, execute them now.
+  if (aggregator_.HasPendingUpdate())
+    DoPaint();
+}
+
+void PaintManager::OnManualCallbackComplete(int32_t) {
+  PP_DCHECK(manual_callback_pending_);
+  manual_callback_pending_ = false;
+
+  // Just because we have a manual callback doesn't mean there are actually any
+  // invalid regions. Even though we only schedule this callback when something
+  // is pending, a Flush callback could have come in before this callback was
+  // executed and that could have cleared the queue.
+  if (aggregator_.HasPendingUpdate() && !flush_pending_)
+    DoPaint();
+}
+
+
+}  // namespace pp