gcl change rev

ppapi/cpp/paint_manager.cc

-// 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/cpp/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