ui/compositor/paint_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/paint_recorder.h"
   6
   7 #include "cc/resources/display_item_list.h"
   8 #include "cc/resources/drawing_display_item.h"
   9 #include "third_party/skia/include/core/SkPictureRecorder.h"
  10 #include "ui/compositor/paint_context.h"
  11 #include "ui/gfx/canvas.h"
  12 #include "ui/gfx/skia_util.h"
  13
  14 namespace ui {
  15
  16 PaintRecorder::PaintRecorder(const PaintContext& context)
  17     : context_(context), canvas_(context.canvas_) {
  18 #if DCHECK_IS_ON()
  19   DCHECK(!context.inside_paint_recorder_);
  20   context.inside_paint_recorder_ = true;
  21 #endif
  22
  23   if (context.list_) {
  24     SkRTreeFactory* no_factory = nullptr;
  25     // This SkCancas is shared with the recorder_ so no need to store a RefPtr
  26     // to it on this class.
  27     skia::RefPtr<SkCanvas> skcanvas =
  28         skia::SharePtr(context.recorder_->beginRecording(
  29             gfx::RectToSkRect(context.bounds_), no_factory,
  30             SkPictureRecorder::kComputeSaveLayerInfo_RecordFlag));
  31     owned_canvas_ = make_scoped_ptr(gfx::Canvas::CreateCanvasWithoutScaling(
  32         skcanvas.get(), context.device_scale_factor_));
  33     canvas_ = owned_canvas_.get();
  34   }
  35 }
  36
  37 PaintRecorder::~PaintRecorder() {
  38 #if DCHECK_IS_ON()
  39   context_.inside_paint_recorder_ = false;
  40 #endif
  41
  42   if (context_.list_) {
  43     context_.list_->AppendItem(cc::DrawingDisplayItem::Create(
  44         skia::AdoptRef(context_.recorder_->endRecordingAsPicture())));
  45   }
  46 }
  47
  48 }  // namespace ui