text: // Copyright 2015 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 "ui/compositor/clip_recorder.h"
  
  #include "cc/playback/clip_display_item.h"
  #include "cc/playback/clip_path_display_item.h"
  #include "cc/playback/display_item_list.h"
  #include "ui/compositor/paint_context.h"
  #include "ui/gfx/canvas.h"
  #include "ui/gfx/geometry/rect.h"
  #include "ui/gfx/geometry/rect_conversions.h"
  #include "ui/gfx/path.h"
  #include "ui/gfx/skia_util.h"
  
  namespace ui {
  
  ClipRecorder::ClipRecorder(const PaintContext& context)
      : context_(context), num_closers_(0) {}
  
  ClipRecorder::~ClipRecorder() {
    for (int i = num_closers_ - 1; i >= 0; --i) {
      const gfx::Rect& bounds_in_layer = bounds_in_layer_[i];
      switch (closers_[i]) {
        case CLIP_RECT:
          context_.list_->CreateAndAppendItem<cc::EndClipDisplayItem>(
              bounds_in_layer);
          break;
        case CLIP_PATH:
          context_.list_->CreateAndAppendItem<cc::EndClipPathDisplayItem>(
              bounds_in_layer);
          break;
      }
    }
  }
  
  void ClipRecorder::RecordCloser(const gfx::Rect& bounds_in_layer,
                                  Closer closer) {
    DCHECK_LT(num_closers_, kMaxOpCount);
    closers_[num_closers_] = closer;
    bounds_in_layer_[num_closers_++] = bounds_in_layer;
  }
  
  static gfx::Rect PathToEnclosingRect(const gfx::Path& path) {
    return gfx::ToEnclosingRect(gfx::SkRectToRectF(path.getBounds()));
  }
  
  void ClipRecorder::ClipRect(const gfx::Rect& clip_rect) {
    bool antialias = false;
    gfx::Rect clip_in_layer_space = context_.ToLayerSpaceRect(clip_rect);
    context_.list_->CreateAndAppendItem<cc::ClipDisplayItem>(
        clip_in_layer_space, clip_rect, std::vector<SkRRect>(), antialias);
    RecordCloser(clip_in_layer_space, CLIP_RECT);
  }
  
  void ClipRecorder::ClipPath(const gfx::Path& clip_path) {
    bool antialias = false;
    gfx::Rect clip_in_layer_space =
        context_.ToLayerSpaceRect(PathToEnclosingRect(clip_path));
    context_.list_->CreateAndAppendItem<cc::ClipPathDisplayItem>(
        clip_in_layer_space, clip_path, SkRegion::kIntersect_Op, antialias);
    RecordCloser(clip_in_layer_space, CLIP_PATH);
  }
  
  void ClipRecorder::ClipPathWithAntiAliasing(const gfx::Path& clip_path) {
    bool antialias = true;
    gfx::Rect clip_in_layer_space =
        context_.ToLayerSpaceRect(PathToEnclosingRect(clip_path));
    context_.list_->CreateAndAppendItem<cc::ClipPathDisplayItem>(
        clip_in_layer_space, clip_path, SkRegion::kIntersect_Op, antialias);
    RecordCloser(clip_in_layer_space, CLIP_PATH);
  }
  
  }  // namespace ui
  