cc/resources/filter_display_item.cc

   1 // Copyright 2014 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 "cc/resources/filter_display_item.h"
   6
   7 #include "third_party/skia/include/core/SkCanvas.h"
   8 #include "third_party/skia/include/core/SkImageFilter.h"
   9 #include "third_party/skia/include/core/SkPaint.h"
  10 #include "third_party/skia/include/core/SkXfermode.h"
  11 #include "ui/gfx/skia_util.h"
  12
  13 namespace cc {
  14
  15 FilterDisplayItem::FilterDisplayItem(skia::RefPtr<SkImageFilter> filter,
  16                                      gfx::RectF bounds)
  17     : filter_(filter), bounds_(bounds) {
  18 }
  19
  20 FilterDisplayItem::~FilterDisplayItem() {
  21 }
  22
  23 void FilterDisplayItem::Raster(SkCanvas* canvas,
  24                                SkDrawPictureCallback* callback) const {
  25   canvas->save();
  26   SkRect boundaries;
  27   filter_->computeFastBounds(gfx::RectFToSkRect(bounds_), &boundaries);
  28   canvas->translate(bounds_.x(), bounds_.y());
  29   boundaries.offset(-bounds_.x(), -bounds_.y());
  30
  31   SkPaint paint;
  32   paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
  33   paint.setImageFilter(filter_.get());
  34   canvas->saveLayer(&boundaries, &paint);
  35
  36   canvas->translate(-bounds_.x(), -bounds_.y());
  37 }
  38
  39 bool FilterDisplayItem::IsSuitableForGpuRasterization() const {
  40   return true;
  41 }
  42
  43 int FilterDisplayItem::ApproximateOpCount() const {
  44   return 1;
  45 }
  46
  47 size_t FilterDisplayItem::PictureMemoryUsage() const {
  48   return sizeof(skia::RefPtr<SkImageFilter>) + sizeof(gfx::RectF);
  49 }
  50
  51 EndFilterDisplayItem::EndFilterDisplayItem() {
  52 }
  53
  54 EndFilterDisplayItem::~EndFilterDisplayItem() {
  55 }
  56
  57 void EndFilterDisplayItem::Raster(SkCanvas* canvas,
  58                                   SkDrawPictureCallback* callback) const {
  59   canvas->restore();
  60   canvas->restore();
  61 }
  62
  63 bool EndFilterDisplayItem::IsSuitableForGpuRasterization() const {
  64   return true;
  65 }
  66
  67 int EndFilterDisplayItem::ApproximateOpCount() const {
  68   return 0;
  69 }
  70
  71 size_t EndFilterDisplayItem::PictureMemoryUsage() const {
  72   return 0;
  73 }
  74
  75 }  // namespace cc