cc/test/layer_tree_json_parser.cc

   1 // Copyright 2013 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/test/layer_tree_json_parser.h"
   6
   7 #include "base/test/values_test_util.h"
   8 #include "base/values.h"
   9 #include "cc/layers/content_layer.h"
  10 #include "cc/layers/layer.h"
  11 #include "cc/layers/nine_patch_layer.h"
  12 #include "cc/layers/picture_layer.h"
  13 #include "cc/layers/solid_color_layer.h"
  14 #include "cc/layers/texture_layer.h"
  15
  16 namespace cc {
  17
  18 namespace {
  19
  20 scoped_refptr<Layer> ParseTreeFromValue(base::Value* val,
  21                                         ContentLayerClient* content_client) {
  22   base::DictionaryValue* dict;
  23   bool success = true;
  24   success &= val->GetAsDictionary(&dict);
  25   std::string layer_type;
  26   success &= dict->GetString("LayerType", &layer_type);
  27   base::ListValue* list;
  28   success &= dict->GetList("Bounds", &list);
  29   int width, height;
  30   success &= list->GetInteger(0, &width);
  31   success &= list->GetInteger(1, &height);
  32   success &= dict->GetList("Position", &list);
  33   double position_x, position_y;
  34   success &= list->GetDouble(0, &position_x);
  35   success &= list->GetDouble(1, &position_y);
  36
  37   bool draws_content;
  38   success &= dict->GetBoolean("DrawsContent", &draws_content);
  39
  40   scoped_refptr<Layer> new_layer;
  41   if (layer_type == "SolidColorLayer") {
  42     new_layer = SolidColorLayer::Create();
  43   } else if (layer_type == "ContentLayer") {
  44     new_layer = ContentLayer::Create(content_client);
  45   } else if (layer_type == "NinePatchLayer") {
  46     success &= dict->GetList("ImageAperture", &list);
  47     int aperture_x, aperture_y, aperture_width, aperture_height;
  48     success &= list->GetInteger(0, &aperture_x);
  49     success &= list->GetInteger(1, &aperture_y);
  50     success &= list->GetInteger(2, &aperture_width);
  51     success &= list->GetInteger(3, &aperture_height);
  52
  53     base::ListValue* bounds;
  54     success &= dict->GetList("ImageBounds", &bounds);
  55     double image_width, image_height;
  56     success &= bounds->GetDouble(0, &image_width);
  57     success &= bounds->GetDouble(1, &image_height);
  58
  59     success &= dict->GetList("Border", &list);
  60     int border_x, border_y, border_width, border_height;
  61     success &= list->GetInteger(0, &border_x);
  62     success &= list->GetInteger(1, &border_y);
  63     success &= list->GetInteger(2, &border_width);
  64     success &= list->GetInteger(3, &border_height);
  65
  66     bool fill_center;
  67     success &= dict->GetBoolean("FillCenter", &fill_center);
  68
  69     scoped_refptr<NinePatchLayer> nine_patch_layer = NinePatchLayer::Create();
  70
  71     SkBitmap bitmap;
  72     bitmap.setConfig(SkBitmap::kARGB_8888_Config, image_width, image_height);
  73     bitmap.allocPixels(NULL, NULL);
  74     bitmap.setImmutable();
  75     nine_patch_layer->SetBitmap(bitmap);
  76     nine_patch_layer->SetAperture(
  77         gfx::Rect(aperture_x, aperture_y, aperture_width, aperture_height));
  78     nine_patch_layer->SetBorder(
  79         gfx::Rect(border_x, border_y, border_width, border_height));
  80     nine_patch_layer->SetFillCenter(fill_center);
  81
  82     new_layer = nine_patch_layer;
  83   } else if (layer_type == "TextureLayer") {
  84     new_layer = TextureLayer::CreateForMailbox(NULL);
  85   } else if (layer_type == "PictureLayer") {
  86     new_layer = PictureLayer::Create(content_client);
  87   } else {  // Type "Layer" or "unknown"
  88     new_layer = Layer::Create();
  89   }
  90   new_layer->SetAnchorPoint(gfx::Point());
  91   new_layer->SetPosition(gfx::PointF(position_x, position_y));
  92   new_layer->SetBounds(gfx::Size(width, height));
  93   new_layer->SetIsDrawable(draws_content);
  94
  95   double opacity;
  96   if (dict->GetDouble("Opacity", &opacity))
  97     new_layer->SetOpacity(opacity);
  98
  99   bool contents_opaque;
 100   if (dict->GetBoolean("ContentsOpaque", &contents_opaque))
 101     new_layer->SetContentsOpaque(contents_opaque);
 102
 103   bool scrollable;
 104   // TODO(wjmaclean) At some time in the future we may wish to test that a
 105   // reconstructed layer tree contains the correct linkage for the scroll
 106   // clip layer. This is complicated by the fact that the json output doesn't
 107   // (currently) re-construct the tree with the same layer IDs as the original.
 108   // But, since a clip layer is always an ancestor of the scrollable layer, we
 109   // can just count the number of upwards hops to the clip layer and write that
 110   // into the json file (with 0 hops implying no clip layer, i.e. not
 111   // scrollable). Reconstructing the tree can then be accomplished by passing
 112   // the parent pointer to this function and traversing the same number of
 113   // ancestors to determine the pointer to the clip layer. The LayerTreesMatch()
 114   // function should then check that both original and reconstructed layers
 115   // have the same positioning with respect to their clip layers.
 116   //
 117   // For now, we can safely indicate a layer is scrollable by giving it a
 118   // pointer to itself, something not normally allowed in a working tree.
 119   //
 120   // https://code.google.com/p/chromium/issues/detail?id=330622
 121   //
 122   if (dict->GetBoolean("Scrollable", &scrollable))
 123     new_layer->SetScrollClipLayerId(scrollable ? new_layer->id()
 124                                                : Layer::INVALID_ID);
 125
 126   bool wheel_handler;
 127   if (dict->GetBoolean("WheelHandler", &wheel_handler))
 128     new_layer->SetHaveWheelEventHandlers(wheel_handler);
 129
 130   if (dict->HasKey("TouchRegion")) {
 131     success &= dict->GetList("TouchRegion", &list);
 132     Region touch_region;
 133     for (size_t i = 0; i < list->GetSize(); ) {
 134       int rect_x, rect_y, rect_width, rect_height;
 135       success &= list->GetInteger(i++, &rect_x);
 136       success &= list->GetInteger(i++, &rect_y);
 137       success &= list->GetInteger(i++, &rect_width);
 138       success &= list->GetInteger(i++, &rect_height);
 139       touch_region.Union(gfx::Rect(rect_x, rect_y, rect_width, rect_height));
 140     }
 141     new_layer->SetTouchEventHandlerRegion(touch_region);
 142   }
 143
 144   success &= dict->GetList("DrawTransform", &list);
 145   double transform[16];
 146   for (int i = 0; i < 16; ++i)
 147     success &= list->GetDouble(i, &transform[i]);
 148
 149   gfx::Transform layer_transform;
 150   layer_transform.matrix().setColMajord(transform);
 151   new_layer->SetTransform(layer_transform);
 152
 153   success &= dict->GetList("Children", &list);
 154   for (base::ListValue::const_iterator it = list->begin();
 155        it != list->end(); ++it) {
 156     new_layer->AddChild(ParseTreeFromValue(*it, content_client));
 157   }
 158
 159   if (!success)
 160     return NULL;
 161
 162   return new_layer;
 163 }
 164
 165 }  // namespace
 166
 167 scoped_refptr<Layer> ParseTreeFromJson(std::string json,
 168                                        ContentLayerClient* content_client) {
 169   scoped_ptr<base::Value> val = base::test::ParseJson(json);
 170   return ParseTreeFromValue(val.get(), content_client);
 171 }
 172
 173 }  // namespace cc