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 "base/strings/stringprintf.h"
   8 #include "base/trace_event/trace_event_argument.h"
   9 #include "cc/output/render_surface_filters.h"
  10 #include "skia/ext/refptr.h"
  11 #include "third_party/skia/include/core/SkCanvas.h"
  12 #include "third_party/skia/include/core/SkImageFilter.h"
  13 #include "third_party/skia/include/core/SkPaint.h"
  14 #include "third_party/skia/include/core/SkXfermode.h"
  15 #include "ui/gfx/skia_util.h"
  16
  17 namespace cc {
  18
  19 FilterDisplayItem::FilterDisplayItem(const FilterOperations& filters,
  20                                      gfx::RectF bounds)
  21     : filters_(filters), bounds_(bounds) {
  22 }
  23
  24 FilterDisplayItem::~FilterDisplayItem() {
  25 }
  26
  27 void FilterDisplayItem::Raster(SkCanvas* canvas,
  28                                SkDrawPictureCallback* callback) const {
  29   canvas->save();
  30   canvas->translate(bounds_.x(), bounds_.y());
  31
  32   skia::RefPtr<SkImageFilter> image_filter =
  33       RenderSurfaceFilters::BuildImageFilter(
  34           filters_, gfx::SizeF(bounds_.width(), bounds_.height()));
  35   SkRect boundaries;
  36   image_filter->computeFastBounds(
  37       SkRect::MakeWH(bounds_.width(), bounds_.height()), &boundaries);
  38
  39   SkPaint paint;
  40   paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
  41   paint.setImageFilter(image_filter.get());
  42   canvas->saveLayer(&boundaries, &paint);
  43
  44   canvas->translate(-bounds_.x(), -bounds_.y());
  45 }
  46
  47 bool FilterDisplayItem::IsSuitableForGpuRasterization() const {
  48   return true;
  49 }
  50
  51 int FilterDisplayItem::ApproximateOpCount() const {
  52   return 1;
  53 }
  54
  55 size_t FilterDisplayItem::PictureMemoryUsage() const {
  56   return sizeof(skia::RefPtr<SkImageFilter>) + sizeof(gfx::RectF);
  57 }
  58
  59 void FilterDisplayItem::AsValueInto(
  60     base::trace_event::TracedValue* array) const {
  61   array->AppendString(base::StringPrintf("FilterDisplayItem bounds: [%s]",
  62                                          bounds_.ToString().c_str()));
  63 }
  64
  65 EndFilterDisplayItem::EndFilterDisplayItem() {
  66 }
  67
  68 EndFilterDisplayItem::~EndFilterDisplayItem() {
  69 }
  70
  71 void EndFilterDisplayItem::Raster(SkCanvas* canvas,
  72                                   SkDrawPictureCallback* callback) const {
  73   canvas->restore();
  74   canvas->restore();
  75 }
  76
  77 bool EndFilterDisplayItem::IsSuitableForGpuRasterization() const {
  78   return true;
  79 }
  80
  81 int EndFilterDisplayItem::ApproximateOpCount() const {
  82   return 0;
  83 }
  84
  85 size_t EndFilterDisplayItem::PictureMemoryUsage() const {
  86   return 0;
  87 }
  88
  89 void EndFilterDisplayItem::AsValueInto(
  90     base::trace_event::TracedValue* array) const {
  91   array->AppendString("EndFilterDisplayItem");
  92 }
  93
  94 }  // namespace cc