ui/compositor/compositing_recorder.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/compositor/compositing_recorder.h"
   6
   7 #include "cc/playback/compositing_display_item.h"
   8 #include "cc/playback/display_item_list.h"
   9 #include "ui/compositor/paint_context.h"
  10 #include "ui/gfx/canvas.h"
  11
  12 namespace ui {
  13
  14 CompositingRecorder::CompositingRecorder(const PaintContext& context,
  15                                          uint8_t alpha)
  16     : context_(context), saved_(alpha < 255) {
  17   if (!saved_)
  18     return;
  19
  20   auto* item =
  21       context_.list_->CreateAndAppendItem<cc::CompositingDisplayItem>();
  22   item->SetNew(alpha, SkXfermode::kSrcOver_Mode, nullptr /* no bounds */,
  23                skia::RefPtr<SkColorFilter>());
  24 }
  25
  26 CompositingRecorder::~CompositingRecorder() {
  27   if (!saved_)
  28     return;
  29
  30   context_.list_->CreateAndAppendItem<cc::EndCompositingDisplayItem>();
  31 }
  32
  33 }  // namespace ui