cc/playback/filter_display_item.cc

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/playback/filter_display_item.h"

#include "base/strings/stringprintf.h"
#include "base/trace_event/trace_event_argument.h"
#include "cc/output/render_surface_filters.h"
#include "skia/ext/refptr.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkImageFilter.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/core/SkXfermode.h"
#include "ui/gfx/skia_util.h"

namespace cc {

FilterDisplayItem::FilterDisplayItem() {
}

FilterDisplayItem::~FilterDisplayItem() {
}

void FilterDisplayItem::SetNew(const FilterOperations& filters,
                               const gfx::RectF& bounds) {
  filters_ = filters;
  bounds_ = bounds;

  size_t memory_usage =
      sizeof(skia::RefPtr<SkImageFilter>) + sizeof(gfx::RectF);
  DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 1 /* op_count */,
                      memory_usage);
}

void FilterDisplayItem::Raster(SkCanvas* canvas,
                               SkPicture::AbortCallback* callback) const {
  canvas->save();
  canvas->translate(bounds_.x(), bounds_.y());

  skia::RefPtr<SkImageFilter> image_filter =
      RenderSurfaceFilters::BuildImageFilter(
          filters_, gfx::SizeF(bounds_.width(), bounds_.height()));
  SkRect boundaries;
  image_filter->computeFastBounds(
      SkRect::MakeWH(bounds_.width(), bounds_.height()), &boundaries);

  SkPaint paint;
  paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
  paint.setImageFilter(image_filter.get());
  canvas->saveLayer(&boundaries, &paint);

  canvas->translate(-bounds_.x(), -bounds_.y());
}

void FilterDisplayItem::AsValueInto(
    base::trace_event::TracedValue* array) const {
  array->AppendString(base::StringPrintf("FilterDisplayItem bounds: [%s]",
                                         bounds_.ToString().c_str()));
}

EndFilterDisplayItem::EndFilterDisplayItem() {
  DisplayItem::SetNew(true /* suitable_for_gpu_raster */, 0 /* op_count */,
                      0 /* memory_usage */);
}

EndFilterDisplayItem::~EndFilterDisplayItem() {
}

void EndFilterDisplayItem::Raster(SkCanvas* canvas,
                                  SkPicture::AbortCallback* callback) const {
  canvas->restore();
  canvas->restore();
}

void EndFilterDisplayItem::AsValueInto(
    base::trace_event::TracedValue* array) const {
  array->AppendString("EndFilterDisplayItem");
}

}  // namespace cc