Raster PictureLayerTiling with fractional translation

cc/tiles/tile.cc

 // Copyright 2012 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/tiles/tile.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
 #include "base/numerics/safe_conversions.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/base/math_util.h"
 #include "cc/debug/traced_value.h"
 #include "cc/tiles/tile_manager.h"
 
 namespace cc {
 
 Tile::Tile(TileManager* tile_manager,
            const CreateInfo& info,
            int layer_id,
            int source_frame_number,
            int flags)
     : tile_manager_(tile_manager),
       content_rect_(info.content_rect),
       enclosing_layer_rect_(info.enclosing_layer_rect),
-      contents_scale_(info.contents_scale),
+      contents_transform_(info.contents_transform),
       layer_id_(layer_id),
       source_frame_number_(source_frame_number),
       flags_(flags),
       tiling_i_index_(info.tiling_i_index),
       tiling_j_index_(info.tiling_j_index),
       required_for_activation_(false),
       required_for_draw_(false),
       id_(tile_manager->GetUniqueTileId()),
       invalidated_id_(0),
       scheduled_priority_(0) {}
 
 Tile::~Tile() {
   TRACE_EVENT_OBJECT_DELETED_WITH_ID(
       TRACE_DISABLED_BY_DEFAULT("cc.debug"),
       "cc::Tile", this);
 }
 
 void Tile::AsValueInto(base::trace_event::TracedValue* value) const {
   TracedValue::MakeDictIntoImplicitSnapshotWithCategory(
       TRACE_DISABLED_BY_DEFAULT("cc.debug"), value, "cc::Tile", this);
-  value->SetDouble("contents_scale", contents_scale_);
+  value->SetDouble("contents_transform_pre_scale",

[enne (OOO), 2016/08/29 20:21:19]

bikeshed: I'd leave this as contents_scale and contents_translation

+                   contents_transform_.pre_scale());
+  MathUtil::AddToTracedValue("contents_transform_translation",
+                             contents_transform_.translation(), value);
 
   MathUtil::AddToTracedValue("content_rect", content_rect_, value);
 
   value->SetInteger("layer_id", layer_id_);
 
   value->BeginDictionary("draw_info");
   draw_info_.AsValueInto(value);
   value->EndDictionary();
 
   value->SetBoolean("has_resource", draw_info().has_resource());
@@ skipping 13 matching lines @@
         draw_info_.resource_->size(), draw_info_.resource_->format());
   }
   return 0;
 }
 
 void Tile::Deleter::operator()(Tile* tile) const {
   tile->tile_manager_->Release(tile);
 }
 
 }  // namespace cc