cc/playback/drawing_display_item.cc

// Copyright 2014 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 "cc/playback/drawing_display_item.h"

#include <string>

#include "base/strings/stringprintf.h"
#include "base/trace_event/trace_event_argument.h"
#include "cc/debug/picture_debug_util.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkMatrix.h"
#include "third_party/skia/include/core/SkPicture.h"
#include "third_party/skia/include/utils/SkPictureUtils.h"
#include "ui/gfx/skia_util.h"

namespace cc {

DrawingDisplayItem::DrawingDisplayItem() {
}

DrawingDisplayItem::~DrawingDisplayItem() {
}

void DrawingDisplayItem::SetNew(skia::RefPtr<SkPicture> picture) {
  picture_ = picture.Pass();
  DisplayItem::SetNew(picture_->suitableForGpuRasterization(NULL),
                      picture_->approximateOpCount(),
                      SkPictureUtils::ApproximateBytesUsed(picture_.get()));
}

void DrawingDisplayItem::Raster(SkCanvas* canvas,
                                const gfx::Rect& canvas_target_playback_rect,
                                SkPicture::AbortCallback* callback) const {
  // The canvas_playback_rect can be empty to signify no culling is desired.
  if (!canvas_target_playback_rect.IsEmpty()) {
    const SkMatrix& matrix = canvas->getTotalMatrix();
    const SkRect& cull_rect = picture_->cullRect();
    SkRect target_rect;
    matrix.mapRect(&target_rect, cull_rect);
    if (!target_rect.intersect(gfx::RectToSkRect(canvas_target_playback_rect)))
      return;
  }

  // SkPicture always does a wrapping save/restore on the canvas, so it is not
  // necessary here.
  if (callback)
    picture_->playback(canvas, callback);
  else
    canvas->drawPicture(picture_.get());
}

void DrawingDisplayItem::AsValueInto(
    base::trace_event::TracedValue* array) const {
  array->BeginDictionary();
  array->SetString("name", "DrawingDisplayItem");
  array->SetString(
      "cullRect",
      base::StringPrintf("[%f,%f,%f,%f]", picture_->cullRect().x(),
                         picture_->cullRect().y(), picture_->cullRect().width(),
                         picture_->cullRect().height()));
  std::string b64_picture;
  PictureDebugUtil::SerializeAsBase64(picture_.get(), &b64_picture);
  array->SetString("skp64", b64_picture);
  array->EndDictionary();
}

void DrawingDisplayItem::CloneTo(DrawingDisplayItem* item) const {
  item->SetNew(picture_);
}

}  // namespace cc