ui/compositor/clip_transform_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/clip_transform_recorder.h"
   6
   7 #include "base/logging.h"
   8 #include "cc/playback/clip_display_item.h"
   9 #include "cc/playback/clip_path_display_item.h"
  10 #include "cc/playback/display_item_list.h"
  11 #include "cc/playback/transform_display_item.h"
  12 #include "ui/compositor/paint_context.h"
  13 #include "ui/gfx/canvas.h"
  14 #include "ui/gfx/path.h"
  15
  16 namespace ui {
  17
  18 ClipTransformRecorder::ClipTransformRecorder(const PaintContext& context)
  19     : context_(context), num_closers_(0) {
  20 }
  21
  22 ClipTransformRecorder::~ClipTransformRecorder() {
  23   for (size_t i = 0; i < num_closers_; ++i) {
  24     switch (closers_[i]) {
  25       case CLIP_RECT:
  26         context_.list_->CreateAndAppendItem<cc::EndClipDisplayItem>();
  27         break;
  28       case CLIP_PATH:
  29         context_.list_->CreateAndAppendItem<cc::EndClipPathDisplayItem>();
  30         break;
  31       case TRANSFORM:
  32         context_.list_->CreateAndAppendItem<cc::EndTransformDisplayItem>();
  33         break;
  34     }
  35   }
  36 }
  37
  38 void ClipTransformRecorder::ClipRect(const gfx::Rect& clip_rect) {
  39   auto* item = context_.list_->CreateAndAppendItem<cc::ClipDisplayItem>();
  40   item->SetNew(clip_rect, std::vector<SkRRect>());
  41   DCHECK_LT(num_closers_, arraysize(closers_));
  42   closers_[num_closers_++] = CLIP_RECT;
  43 }
  44
  45 void ClipTransformRecorder::ClipPath(const gfx::Path& clip_path) {
  46   bool anti_alias = false;
  47   auto* item = context_.list_->CreateAndAppendItem<cc::ClipPathDisplayItem>();
  48   item->SetNew(clip_path, SkRegion::kIntersect_Op, anti_alias);
  49   DCHECK_LT(num_closers_, arraysize(closers_));
  50   closers_[num_closers_++] = CLIP_PATH;
  51 }
  52
  53 void ClipTransformRecorder::ClipPathWithAntiAliasing(
  54     const gfx::Path& clip_path) {
  55   bool anti_alias = true;
  56   auto* item = context_.list_->CreateAndAppendItem<cc::ClipPathDisplayItem>();
  57   item->SetNew(clip_path, SkRegion::kIntersect_Op, anti_alias);
  58   DCHECK_LT(num_closers_, arraysize(closers_));
  59   closers_[num_closers_++] = CLIP_PATH;
  60 }
  61
  62 void ClipTransformRecorder::Transform(const gfx::Transform& transform) {
  63   auto* item = context_.list_->CreateAndAppendItem<cc::TransformDisplayItem>();
  64   item->SetNew(transform);
  65   DCHECK_LT(num_closers_, arraysize(closers_));
  66   closers_[num_closers_++] = TRANSFORM;
  67 }
  68
  69 }  // namespace ui