Fix CSS reference filters with negative transformed children.

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 <stddef.h>
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/output/render_surface_filters.h"
 #include "cc/proto/display_item.pb.h"
 #include "cc/proto/gfx_conversions.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/SkRefCnt.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/gfx/skia_util.h"
 
 namespace cc {
 
 FilterDisplayItem::FilterDisplayItem(const FilterOperations& filters,
-                                     const gfx::RectF& bounds) {
-  SetNew(filters, bounds);
+                                     const gfx::RectF& bounds,
+                                     const gfx::PointF& origin) {
+  SetNew(filters, bounds, origin);
 }
 
 FilterDisplayItem::FilterDisplayItem(const proto::DisplayItem& proto) {
   DCHECK_EQ(proto::DisplayItem::Type_Filter, proto.type());
 
   const proto::FilterDisplayItem& details = proto.filter_item();
   gfx::RectF bounds = ProtoToRectF(details.bounds());
 
   // TODO(dtrainor): Support deserializing FilterOperations (crbug.com/541321).
   FilterOperations filters;
-
-  SetNew(filters, bounds);
+  gfx::PointF origin(.0f, .0f);  // TODO(senorblanco): Support origin.
+  SetNew(filters, bounds, origin);
 }
 
 FilterDisplayItem::~FilterDisplayItem() {}
 
 void FilterDisplayItem::SetNew(const FilterOperations& filters,
-                               const gfx::RectF& bounds) {
+                               const gfx::RectF& bounds,
+                               const gfx::PointF& origin) {
   filters_ = filters;
   bounds_ = bounds;
+  origin_ = origin;
 }
 
 void FilterDisplayItem::ToProtobuf(proto::DisplayItem* proto) const {
   proto->set_type(proto::DisplayItem::Type_Filter);
 
   proto::FilterDisplayItem* details = proto->mutable_filter_item();
   RectFToProto(bounds_, details->mutable_bounds());
 
   // TODO(dtrainor): Support serializing FilterOperations (crbug.com/541321).
 }
 
 void FilterDisplayItem::Raster(SkCanvas* canvas,
                                SkPicture::AbortCallback* callback) const {
   canvas->save();
-  canvas->translate(bounds_.x(), bounds_.y());
+  canvas->translate(origin_.x(), origin_.y());
 
   sk_sp<SkImageFilter> image_filter = RenderSurfaceFilters::BuildImageFilter(
       filters_, gfx::SizeF(bounds_.width(), bounds_.height()));
-  SkRect boundaries = SkRect::MakeWH(bounds_.width(), bounds_.height());
+  SkRect boundaries = RectFToSkRect(bounds_);
+  boundaries.offset(-origin_.x(), -origin_.y());
 
   SkPaint paint;
   paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
   paint.setImageFilter(std::move(image_filter));
   canvas->saveLayer(&boundaries, &paint);
 
-  canvas->translate(-bounds_.x(), -bounds_.y());
+  canvas->translate(-origin_.x(), -origin_.y());
 }
 
 void FilterDisplayItem::AsValueInto(
     const gfx::Rect& visual_rect,
     base::trace_event::TracedValue* array) const {
   array->AppendString(base::StringPrintf(
       "FilterDisplayItem bounds: [%s] visualRect: [%s]",
       bounds_.ToString().c_str(), visual_rect.ToString().c_str()));
 }
 
@@ skipping 27 matching lines @@
   array->AppendString(
       base::StringPrintf("EndFilterDisplayItem  visualRect: [%s]",
                          visual_rect.ToString().c_str()));
 }
 
 size_t EndFilterDisplayItem::ExternalMemoryUsage() const {
   return 0;
 }
 
 }  // namespace cc