| // Copyright (c) 2010 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 "pdf/paint_manager.h" |
| |
| #include <algorithm> |
| |
| #include "base/logging.h" |
| #include "ppapi/c/pp_errors.h" |
| #include "ppapi/cpp/instance.h" |
| #include "ppapi/cpp/module.h" |
| |
| PaintManager::PaintManager(pp::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), |
| graphics_need_to_be_bound_(false), |
| pending_device_scale_(1.0), |
| device_scale_(1.0), |
| in_paint_(false), |
| first_paint_(true), |
| view_size_changed_waiting_for_paint_(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. |
| DCHECK(client); |
| } |
| |
| PaintManager::~PaintManager() { |
| } |
| |
| // static |
| pp::Size PaintManager::GetNewContextSize(const pp::Size& current_context_size, |
| const pp::Size& plugin_size) { |
| // The amount of additional space in pixels to allocate to the right/bottom of |
| // the context. |
| const int kBufferSize = 50; |
| |
| // Default to returning the same size. |
| pp::Size result = current_context_size; |
| |
| // The minimum size of the plugin before resizing the context to ensure we |
| // aren't wasting too much memory. We deduct twice the kBufferSize from the |
| // current context size which gives a threshhold that is kBufferSize below |
| // the plugin size when the context size was last computed. |
| pp::Size min_size( |
| std::max(current_context_size.width() - 2 * kBufferSize, 0), |
| std::max(current_context_size.height() - 2 * kBufferSize, 0)); |
| |
| // If the plugin size is bigger than the current context size, we need to |
| // resize the context. If the plugin size is smaller than the current |
| // context size by a given threshhold then resize the context so that we |
| // aren't wasting too much memory. |
| if (plugin_size.width() > current_context_size.width() || |
| plugin_size.height() > current_context_size.height() || |
| plugin_size.width() < min_size.width() || |
| plugin_size.height() < min_size.height()) { |
| // Create a larger context than needed so that if we only resize by a |
| // small margin, we don't need a new context. |
| result = pp::Size(plugin_size.width() + kBufferSize, |
| plugin_size.height() + kBufferSize); |
| } |
| |
| return result; |
| } |
| |
| void PaintManager::Initialize(pp::Instance* instance, |
| Client* client, |
| bool is_always_opaque) { |
| DCHECK(!instance_ && !client_); // Can't initialize twice. |
| instance_ = instance; |
| client_ = client; |
| is_always_opaque_ = is_always_opaque; |
| } |
| |
| void PaintManager::SetSize(const pp::Size& new_size, float device_scale) { |
| if (GetEffectiveSize() == new_size && |
| GetEffectiveDeviceScale() == device_scale) |
| return; |
| |
| has_pending_resize_ = true; |
| pending_size_ = new_size; |
| pending_device_scale_ = device_scale; |
| |
| view_size_changed_waiting_for_paint_ = true; |
| |
| Invalidate(); |
| } |
| |
| void PaintManager::Invalidate() { |
| if (graphics_.is_null() && !has_pending_resize_) |
| return; |
| |
| EnsureCallbackPending(); |
| aggregator_.InvalidateRect(pp::Rect(GetEffectiveSize())); |
| } |
| |
| void PaintManager::InvalidateRect(const pp::Rect& rect) { |
| DCHECK(!in_paint_); |
| |
| if (graphics_.is_null() && !has_pending_resize_) |
| return; |
| |
| // Clip the rect to the device area. |
| pp::Rect clipped_rect = rect.Intersect(pp::Rect(GetEffectiveSize())); |
| if (clipped_rect.IsEmpty()) |
| return; // Nothing to do. |
| |
| EnsureCallbackPending(); |
| aggregator_.InvalidateRect(clipped_rect); |
| } |
| |
| void PaintManager::ScrollRect(const pp::Rect& clip_rect, |
| const pp::Point& amount) { |
| DCHECK(!in_paint_); |
| |
| if (graphics_.is_null() && !has_pending_resize_) |
| return; |
| |
| EnsureCallbackPending(); |
| |
| aggregator_.ScrollRect(clip_rect, amount); |
| } |
| |
| pp::Size PaintManager::GetEffectiveSize() const { |
| return has_pending_resize_ ? pending_size_ : plugin_size_; |
| } |
| |
| float PaintManager::GetEffectiveDeviceScale() const { |
| return has_pending_resize_ ? pending_device_scale_ : device_scale_; |
| } |
| |
| 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; |
| |
| pp::Module::Get()->core()->CallOnMainThread( |
| 0, |
| callback_factory_.NewCallback(&PaintManager::OnManualCallbackComplete), |
| 0); |
| manual_callback_pending_ = true; |
| } |
| |
| void PaintManager::DoPaint() { |
| in_paint_ = true; |
| |
| std::vector<ReadyRect> ready; |
| std::vector<pp::Rect> pending; |
| |
| DCHECK(aggregator_.HasPendingUpdate()); |
| |
| // Apply any pending resize. Setting the graphics to this class must happen |
| // before asking the plugin to paint in case it requests invalides or resizes. |
| // 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. |
| if (has_pending_resize_) { |
| plugin_size_ = pending_size_; |
| // Only create a new graphics context if the current context isn't big |
| // enough or if it is far too big. This avoids creating a new context if |
| // we only resize by a small amount. |
| pp::Size new_size = GetNewContextSize(graphics_.size(), pending_size_); |
| if (graphics_.size() != new_size) { |
| graphics_ = pp::Graphics2D(instance_, new_size, is_always_opaque_); |
| graphics_need_to_be_bound_ = 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(); |
| } |
| |
| if (pending_device_scale_ != 1.0) |
| graphics_.SetScale(1.0 / pending_device_scale_); |
| device_scale_ = pending_device_scale_; |
| |
| // This must be cleared before calling into the plugin since it may do |
| // additional invalidation or sizing operations. |
| has_pending_resize_ = false; |
| pending_size_ = pp::Size(); |
| } |
| |
| PaintAggregator::PaintUpdate update = aggregator_.GetPendingUpdate(); |
| client_->OnPaint(update.paint_rects, &ready, &pending); |
| |
| if (ready.empty() && pending.empty()) { |
| in_paint_ = false; |
| return; // Nothing was painted, don't schedule a flush. |
| } |
| |
| std::vector<PaintAggregator::ReadyRect> ready_now; |
| if (pending.empty()) { |
| std::vector<PaintAggregator::ReadyRect> temp_ready; |
| for (size_t i = 0; i < ready.size(); ++i) |
| temp_ready.push_back(ready[i]); |
| aggregator_.SetIntermediateResults(temp_ready, pending); |
| ready_now = aggregator_.GetReadyRects(); |
| aggregator_.ClearPendingUpdate(); |
| |
| // Apply any scroll first. |
| if (update.has_scroll) |
| graphics_.Scroll(update.scroll_rect, update.scroll_delta); |
| |
| view_size_changed_waiting_for_paint_ = false; |
| } else { |
| std::vector<PaintAggregator::ReadyRect> ready_later; |
| for (size_t i = 0; i < ready.size(); ++i) { |
| // Don't flush any part (i.e. scrollbars) if we're resizing the browser, |
| // as that'll lead to flashes. Until we flush, the browser will use the |
| // previous image, but if we flush, it'll revert to using the blank image. |
| // We make an exception for the first paint since we want to show the |
| // default background color instead of the pepper default of black. |
| if (ready[i].flush_now && |
| (!view_size_changed_waiting_for_paint_ || first_paint_)) { |
| ready_now.push_back(ready[i]); |
| } else { |
| ready_later.push_back(ready[i]); |
| } |
| } |
| // Take the rectangles, except the ones that need to be flushed right away, |
| // and save them so that everything is flushed at once. |
| aggregator_.SetIntermediateResults(ready_later, pending); |
| |
| if (ready_now.empty()) { |
| in_paint_ = false; |
| EnsureCallbackPending(); |
| return; |
| } |
| } |
| |
| for (size_t i = 0; i < ready_now.size(); ++i) { |
| graphics_.PaintImageData( |
| ready_now[i].image_data, ready_now[i].offset, ready_now[i].rect); |
| } |
| |
| int32_t result = graphics_.Flush( |
| callback_factory_.NewCallback(&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. |
| DCHECK(result != PP_ERROR_INPROGRESS); |
| |
| if (result == PP_OK_COMPLETIONPENDING) { |
| flush_pending_ = true; |
| } else { |
| DCHECK(result == PP_OK); // Catch all other errors in debug mode. |
| } |
| |
| in_paint_ = false; |
| first_paint_ = false; |
| |
| if (graphics_need_to_be_bound_) { |
| instance_->BindGraphics(graphics_); |
| graphics_need_to_be_bound_ = false; |
| } |
| } |
| |
| void PaintManager::OnFlushComplete(int32_t) { |
| 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) { |
| 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()) |
| DoPaint(); |
| } |