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.allocN32Pixels(image_width, image_height);
  73     bitmap.setImmutable();
  74     nine_patch_layer->SetBitmap(bitmap);
  75     nine_patch_layer->SetAperture(
  76         gfx::Rect(aperture_x, aperture_y, aperture_width, aperture_height));
  77     nine_patch_layer->SetBorder(
  78         gfx::Rect(border_x, border_y, border_width, border_height));
  79     nine_patch_layer->SetFillCenter(fill_center);
  80
  81     new_layer = nine_patch_layer;
  82   } else if (layer_type == "TextureLayer") {
  83     new_layer = TextureLayer::CreateForMailbox(NULL);
  84   } else if (layer_type == "PictureLayer") {
  85     new_layer = PictureLayer::Create(content_client);
  86   } else {  // Type "Layer" or "unknown"
  87     new_layer = Layer::Create();
  88   }
  89   new_layer->SetAnchorPoint(gfx::Point());
  90   new_layer->SetPosition(gfx::PointF(position_x, position_y));
  91   new_layer->SetBounds(gfx::Size(width, height));
  92   new_layer->SetIsDrawable(draws_content);
  93
  94   double opacity;
  95   if (dict->GetDouble("Opacity", &opacity))
  96     new_layer->SetOpacity(opacity);
  97
  98   bool contents_opaque;
  99   if (dict->GetBoolean("ContentsOpaque", &contents_opaque))
 100     new_layer->SetContentsOpaque(contents_opaque);
 101
 102   bool scrollable;
 103   // TODO(wjmaclean) At some time in the future we may wish to test that a
 104   // reconstructed layer tree contains the correct linkage for the scroll
 105   // clip layer. This is complicated by the fact that the json output doesn't
 106   // (currently) re-construct the tree with the same layer IDs as the original.
 107   // But, since a clip layer is always an ancestor of the scrollable layer, we
 108   // can just count the number of upwards hops to the clip layer and write that
 109   // into the json file (with 0 hops implying no clip layer, i.e. not
 110   // scrollable). Reconstructing the tree can then be accomplished by passing
 111   // the parent pointer to this function and traversing the same number of
 112   // ancestors to determine the pointer to the clip layer. The LayerTreesMatch()
 113   // function should then check that both original and reconstructed layers
 114   // have the same positioning with respect to their clip layers.
 115   //
 116   // For now, we can safely indicate a layer is scrollable by giving it a
 117   // pointer to itself, something not normally allowed in a working tree.
 118   //
 119   // https://code.google.com/p/chromium/issues/detail?id=330622
 120   //
 121   if (dict->GetBoolean("Scrollable", &scrollable))
 122     new_layer->SetScrollClipLayerId(scrollable ? new_layer->id()
 123                                                : Layer::INVALID_ID);
 124
 125   bool wheel_handler;
 126   if (dict->GetBoolean("WheelHandler", &wheel_handler))
 127     new_layer->SetHaveWheelEventHandlers(wheel_handler);
 128
 129   bool scroll_handler;
 130   if (dict->GetBoolean("ScrollHandler", &scroll_handler))
 131     new_layer->SetHaveScrollEventHandlers(scroll_handler);
 132
 133   if (dict->HasKey("TouchRegion")) {
 134     success &= dict->GetList("TouchRegion", &list);
 135     Region touch_region;
 136     for (size_t i = 0; i < list->GetSize(); ) {
 137       int rect_x, rect_y, rect_width, rect_height;
 138       success &= list->GetInteger(i++, &rect_x);
 139       success &= list->GetInteger(i++, &rect_y);
 140       success &= list->GetInteger(i++, &rect_width);
 141       success &= list->GetInteger(i++, &rect_height);
 142       touch_region.Union(gfx::Rect(rect_x, rect_y, rect_width, rect_height));
 143     }
 144     new_layer->SetTouchEventHandlerRegion(touch_region);
 145   }
 146
 147   success &= dict->GetList("DrawTransform", &list);
 148   double transform[16];
 149   for (int i = 0; i < 16; ++i)
 150     success &= list->GetDouble(i, &transform[i]);
 151
 152   gfx::Transform layer_transform;
 153   layer_transform.matrix().setColMajord(transform);
 154   new_layer->SetTransform(layer_transform);
 155
 156   success &= dict->GetList("Children", &list);
 157   for (base::ListValue::const_iterator it = list->begin();
 158        it != list->end(); ++it) {
 159     new_layer->AddChild(ParseTreeFromValue(*it, content_client));
 160   }
 161
 162   if (!success)
 163     return NULL;
 164
 165   return new_layer;
 166 }
 167
 168 }  // namespace
 169
 170 scoped_refptr<Layer> ParseTreeFromJson(std::string json,
 171                                        ContentLayerClient* content_client) {
 172   scoped_ptr<base::Value> val = base::test::ParseJson(json);
 173   return ParseTreeFromValue(val.get(), content_client);
 174 }
 175
 176 }  // namespace cc