[vr] Introduce ColorScheme

chrome/browser/android/vr_shell/color_scheme.cc

Index: chrome/browser/android/vr_shell/color_scheme.cc
diff --git a/chrome/browser/android/vr_shell/color_scheme.cc b/chrome/browser/android/vr_shell/color_scheme.cc
new file mode 100644
index 0000000000000000000000000000000000000000..bd7145cd983e39e3fc95795472045748851a0934
--- /dev/null
+++ b/chrome/browser/android/vr_shell/color_scheme.cc
@@ -0,0 +1,40 @@
+// Copyright 2017 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 "chrome/browser/android/vr_shell/color_scheme.h"
+
+namespace vr_shell {
+
+namespace {
+
+static ColorScheme kColorSchemes[ColorScheme::kNumModes];
+
+void InitializeColorSchemes() {
+  static bool initialized = false;
+  if (initialized)
+    return;
+
+  ColorScheme& normal_scheme = kColorSchemes[ColorScheme::kModeNormal];
+  normal_scheme.horizon = {0.89, 0.89, 0.89, 1.0};
+  normal_scheme.floor = {0.811, 0.811, 0.811, 1.0};
+  normal_scheme.ceiling = {0.859, 0.859, 0.859, 1.0};
+  normal_scheme.grid = {1.0, 1.0, 1.0, 1.0};
+
+  ColorScheme& fullscreen_scheme = kColorSchemes[ColorScheme::kModeFullscreen];
+  fullscreen_scheme.horizon = {0.039215686, 0.0, 0.082352941, 0.149019608};

[acondor_, 2017/05/25 15:34:40]

I didn't realize this before, but why this doesn't have alpha = 1.0, if it is
the background color? amp@?

[Ian Vollick, 2017/05/25 15:54:05]

I bet that this is baking in some of the alpha stuff amp@ was mentioning.

I've switched these back to 1.0 for now, but I assume we can do the alpha
tweaking in a follow on?

[amp, 2017/05/25 15:55:30]

From the chat thread, To quote. "Josh Carpenter
Tue 5:03 PM
@Adam Parker Background color: rba(10, 21, 38). That's a dark blue."

I interpreted rba to mean red blue alpha with a green of zero, but perhaps rba
was a typo and alpha was supposed to be 1.

I agree it doesn't make sense to have background transparent so maybe just shift
the colors over and make alpha 1 and we can revist the exact value with Josh
later.

However, he was very specific about the alpha for the floor being .5 (and then
going to 0 on the edge), which I'm also not sure of the motivation for, so maybe
we just need Josh to clarify.

[acondor_, 2017/05/25 16:00:25]

I guess it makes sense to have 0.5 for grid color, but not much for the floor.
I'd prefer an absolute value there. But sure, let's solve this later to not hold
this CL longer.

+  fullscreen_scheme.floor = {0.02745098, 0.058823529, 0.109803922, 0.5};
+  fullscreen_scheme.ceiling = {0.015686275, 0.031372549, 0.058823529, 1.0};
+  fullscreen_scheme.grid = {0.639215686, 0.878431373, 1.0, 0.5};
+
+  initialized = true;
+}
+
+}  // namespace
+
+const ColorScheme& ColorScheme::GetColorScheme(ColorScheme::Mode mode) {
+  InitializeColorSchemes();
+  return kColorSchemes[static_cast<int>(mode)];
+}
+
+}  // namespace vr_shell