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 #ifdef SK_SAVE_LAYER_BOUNDS_ARE_FILTERED
  47   // TODO(senorblanco): remove this once callsites updated (crbug.com/525748)
  48   SkRect boundaries;
  49   image_filter->computeFastBounds(
  50       SkRect::MakeWH(bounds_.width(), bounds_.height()), &boundaries);
  51 #else
  52   SkRect boundaries = SkRect::MakeWH(bounds_.width(), bounds_.height());
  53 #endif
  54
  55   SkPaint paint;
  56   paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
  57   paint.setImageFilter(image_filter.get());
  58   canvas->saveLayer(&boundaries, &paint);
  59
  60   canvas->translate(-bounds_.x(), -bounds_.y());
  61 }
  62
  63 void FilterDisplayItem::AsValueInto(
  64     base::trace_event::TracedValue* array) const {
  65   array->AppendString(base::StringPrintf("FilterDisplayItem bounds: [%s]",
  66                                          bounds_.ToString().c_str()));
  67 }
  68
  69 EndFilterDisplayItem::EndFilterDisplayItem() {
  70   DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 0 /* op_count */,
  71                       0 /* external_memory_usage */);
  72 }
  73
  74 EndFilterDisplayItem::~EndFilterDisplayItem() {
  75 }
  76
  77 void EndFilterDisplayItem::Raster(SkCanvas* canvas,
  78                                   const gfx::Rect& canvas_target_playback_rect,
  79                                   SkPicture::AbortCallback* callback) const {
  80   canvas->restore();
  81   canvas->restore();
  82 }
  83
  84 void EndFilterDisplayItem::AsValueInto(
  85     base::trace_event::TracedValue* array) const {
  86   array->AppendString("EndFilterDisplayItem");
  87 }
  88
  89 }  // namespace cc