cc/playback/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/playback/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() {
  20 }
  21
  22 FilterDisplayItem::~FilterDisplayItem() {
  23 }
  24
  25 void FilterDisplayItem::SetNew(const FilterOperations& filters,
  26                                const gfx::RectF& bounds) {
  27   filters_ = filters;
  28   bounds_ = bounds;
  29
  30   // FilterOperations doesn't expose its capacity, but size is probably good
  31   // enough.
  32   size_t external_memory_usage = filters_.size() * sizeof(filters_.at(0));
  33   DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 1 /* op_count */,
  34                       external_memory_usage);
  35 }
  36
  37 void FilterDisplayItem::Raster(SkCanvas* canvas,
  38                                const gfx::Rect& canvas_target_playback_rect,
  39                                SkPicture::AbortCallback* callback) const {
  40   canvas->save();
  41   canvas->translate(bounds_.x(), bounds_.y());
  42
  43   skia::RefPtr<SkImageFilter> image_filter =
  44       RenderSurfaceFilters::BuildImageFilter(
  45           filters_, gfx::SizeF(bounds_.width(), bounds_.height()));
  46   SkRect boundaries;
  47   image_filter->computeFastBounds(
  48       SkRect::MakeWH(bounds_.width(), bounds_.height()), &boundaries);
  49
  50   SkPaint paint;
  51   paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
  52   paint.setImageFilter(image_filter.get());
  53   canvas->saveLayer(&boundaries, &paint);
  54
  55   canvas->translate(-bounds_.x(), -bounds_.y());
  56 }
  57
  58 void FilterDisplayItem::AsValueInto(
  59     base::trace_event::TracedValue* array) const {
  60   array->AppendString(base::StringPrintf("FilterDisplayItem bounds: [%s]",
  61                                          bounds_.ToString().c_str()));
  62 }
  63
  64 EndFilterDisplayItem::EndFilterDisplayItem() {
  65   DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 0 /* op_count */,
  66                       0 /* external_memory_usage */);
  67 }
  68
  69 EndFilterDisplayItem::~EndFilterDisplayItem() {
  70 }
  71
  72 void EndFilterDisplayItem::Raster(SkCanvas* canvas,
  73                                   const gfx::Rect& canvas_target_playback_rect,
  74                                   SkPicture::AbortCallback* callback) const {
  75   canvas->restore();
  76   canvas->restore();
  77 }
  78
  79 void EndFilterDisplayItem::AsValueInto(
  80     base::trace_event::TracedValue* array) const {
  81   array->AppendString("EndFilterDisplayItem");
  82 }
  83
  84 }  // namespace cc