VrShell background implemented in JS.

chrome/browser/android/vr_shell/ui_elements.h

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_ANDROID_VR_SHELL_UI_ELEMENTS_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_UI_ELEMENTS_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 10 matching lines @@
   XLEFT,
   XRIGHT
 };
 
 enum YAnchoring {
   YNONE = 0,
   YTOP,
   YBOTTOM
 };
 
+enum Fill {
+  NONE = 0,
+  SPRITE = 1,
+  OPAQUE_GRADIENT = 2,
+  GRID_GRADIENT = 3,
+  // The element is the content quad. Only one content quad may be added to the

[cjgrant, 2017/02/02 14:48:25]

If commenting the type, please comment the others as well (other than NONE :).

[tiborg1, 2017/02/02 16:52:27]

Good point. Done.

+  // scene.
+  CONTENT = 4
+};
+
 struct ReversibleTransform {
   ReversibleTransform();
 
   void MakeIdentity();
   void Rotate(gvr::Quatf quat);
   void Rotate(float ax, float ay, float az, float rad);
   void Translate(float tx, float ty, float tz);
   void Scale(float sx, float sy, float sz);
 
   gvr::Mat4f to_world;
@@ skipping 24 matching lines @@
 
   // Indicates whether the element should be visually rendered.
   bool IsVisible() const;
 
   // Indicates whether the element should be tested for cursor input.
   bool IsHitTestable() const;
 
   // Valid IDs are non-negative.
   int id = -1;
 
-  // If a non-negative parent ID is specified, applicable tranformations
+  // If a non-negative parent ID is specified, applicable transformations
   // are applied relative to the parent, rather than absolutely.
   int parent_id = -1;
 
   // If true, this object will be visible.
   bool visible = true;
 
   // If false, the reticle will not hit the element, even if visible.
   bool hit_testable = true;
 
   // If true, transformations will be applied relative to the field of view,
   // rather than the world.
   bool lock_to_fov = false;
 
-  // If true, this element is the content quad. Only one content quad may be
-  // added to the scene.
-  bool content_quad = false;
-
   // Specifies the region (in pixels) of a texture to render.
   Recti copy_rect = {0, 0, 0, 0};
 
   // The size of the object.  This does not affect children.
   gvr::Vec3f size = {1.0f, 1.0f, 1.0f};
 
   // The scale of the object, and its children.
   gvr::Vec3f scale = {1.0f, 1.0f, 1.0f};
 
   // The rotation of the object, and its children.
@@ skipping 11 matching lines @@
 
   // If anchoring is specified, the translation will be relative to the
   // specified edge(s) of the parent, rather than the center.  A parent object
   // must be specified when using anchoring.
   XAnchoring x_anchoring = XAnchoring::XNONE;
   YAnchoring y_anchoring = YAnchoring::YNONE;
 
   // Animations that affect the properties of the object over time.
   std::vector<std::unique_ptr<Animation>> animations;
 
+  Fill fill = Fill::NONE;
+
+  Colorf edge_color = {1.0f, 1.0f, 1.0f, 1.0f};
+  Colorf center_color = {1.0f, 1.0f, 1.0f, 1.0f};
+
+  unsigned int tile_number;

[cjgrant, 2017/02/02 14:48:25]

tile_number is confusing to me - like it's a sprite or texture number.  I think
num_gridlines or gridline_count would be more clear.

[tiborg1, 2017/02/02 16:52:27]

Done.

+
  private:
   DISALLOW_COPY_AND_ASSIGN(ContentRectangle);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_UI_ELEMENTS_H_