VrShell: implement insecure content warning display

chrome/browser/android/vr_shell/vr_shell.cc

 // 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.
 
 #include "chrome/browser/android/vr_shell/vr_shell.h"
 
 #include <thread>
 
 #include "chrome/browser/android/vr_shell/ui_scene.h"
 #include "chrome/browser/android/vr_shell/vr_compositor.h"
@@ skipping 208 matching lines @@
   gvr::Frame frame = swap_chain_->AcquireFrame();
   gvr::ClockTimePoint target_time = gvr::GvrApi::GetTimePointNow();
   target_time.monotonic_system_time_nanos += kPredictionTimeWithoutVsyncNanos;
   head_pose_ = gvr_api_->GetHeadPoseInStartSpace(target_time);
 
   // Bind back to the default framebuffer.
   frame.BindBuffer(0);
 
   if (webvr_mode_) {
     DrawWebVr();
+    if (!webvr_secure_origin_) {
+      DrawWebVrOverlay();
+    }
   } else {
     DrawVrShell(target_time.monotonic_system_time_nanos);
   }
 
   frame.Unbind();
   frame.Submit(*buffer_viewport_list_, head_pose_);
 }
 
 void VrShell::DrawVrShell(int64_t time) {
   float screen_tilt = desktop_screen_tilt_ * M_PI / 180.0f;
@@ skipping 142 matching lines @@
   glDepthMask(GL_FALSE);
   glDisable(GL_DEPTH_TEST);
   glDisable(GL_SCISSOR_TEST);
   glDisable(GL_BLEND);
   glDisable(GL_POLYGON_OFFSET_FILL);
 
   // Don't need to clear, since we're drawing over the entire render target.
 
   glViewport(0, 0, render_size_.width, render_size_.height);
   vr_shell_renderer_->GetWebVrRenderer()->Draw(content_texture_id_);
+}
 
-  if (!webvr_secure_origin_) {
-    // TODO(klausw): Draw the insecure origin warning here.
+void VrShell::DrawWebVrOverlay() {
+  // Draw WebVR security warning overlays for each eye. This uses
+  // the eye-from-head matrices but not the pose, goal is to place
+  // the icons in an eye-relative position so that they follow along
+  // with head rotations.
+
+  gvr::Mat4f left_eye_view_matrix =
+      gvr_api_->GetEyeFromHeadMatrix(GVR_LEFT_EYE);
+  gvr::Mat4f right_eye_view_matrix =
+      gvr_api_->GetEyeFromHeadMatrix(GVR_RIGHT_EYE);
+
+  buffer_viewport_list_->GetBufferViewport(GVR_LEFT_EYE,
+                                           buffer_viewport_.get());
+  DrawWebVrEye(left_eye_view_matrix, *buffer_viewport_);
+  buffer_viewport_list_->GetBufferViewport(GVR_RIGHT_EYE,
+                                           buffer_viewport_.get());
+  DrawWebVrEye(right_eye_view_matrix, *buffer_viewport_);
+}
+
+void VrShell::DrawWebVrEye(const gvr::Mat4f& view_matrix,
+                           const gvr::BufferViewport& params) {
+  gvr::Recti pixel_rect =
+      CalculatePixelSpaceRect(render_size_, params.GetSourceUv());
+  glViewport(pixel_rect.left, pixel_rect.bottom,
+             pixel_rect.right - pixel_rect.left,
+             pixel_rect.top - pixel_rect.bottom);
+  glScissor(pixel_rect.left, pixel_rect.bottom,
+            pixel_rect.right - pixel_rect.left,
+            pixel_rect.top - pixel_rect.bottom);
+
+  gvr::Mat4f projection_matrix =
+      PerspectiveMatrixFromView(params.GetSourceFov(), kZNear, kZFar);
+
+  // Draw insecure content warning icons.
+  const float warning_depth = 0.7f;  // Distance in meters.
+
+  // Show IDS_WEBSITE_SETTINGS_INSECURE_WEBVR_CONTENT_PERMANENT text.
+  gvr::Mat4f icon_pos;
+  SetIdentityM(icon_pos);
+  const float small_icon_width = 0.15f * warning_depth;
+  const float small_icon_height = small_icon_width / 2.0f;  // 2:1 aspect.
+  const float small_icon_angle = 20.0f * M_PI / 180.f;  // Degrees to radians.
+  ScaleM(icon_pos, icon_pos, small_icon_width, small_icon_height, 1.0f);
+  TranslateM(icon_pos, icon_pos, 0.0f, 0.0f, -warning_depth);
+  icon_pos = MatrixMul(
+      QuatToMatrix(QuatFromAxisAngle(1.f, 0.f, 0.f, small_icon_angle)),
+      icon_pos);
+  gvr::Mat4f combined = MatrixMul(projection_matrix,
+                                  MatrixMul(view_matrix, icon_pos));
+  vr_shell_renderer_->GetOverlayIconRenderer()->Draw(
+      combined, ICON_INSECURE_PERMANENT);
+
+  // Do we need to show the transient warning also?
+  if (webvr_warning_frames_ == 0) {
+    return;
   }
+  --webvr_warning_frames_;
+
+  // Show IDS_WEBSITE_SETTINGS_INSECURE_WEBVR_CONTENT_TRANSIENT text.
+  SetIdentityM(icon_pos);
+  const float large_icon_width = 0.25f * warning_depth;
+  const float large_icon_height = large_icon_width / 2.0f;  // 2:1 aspect.
+  ScaleM(icon_pos, icon_pos, large_icon_width, large_icon_height, 1.0f);
+  TranslateM(icon_pos, icon_pos, 0.0f, 0.0f, -warning_depth);
+  combined = MatrixMul(projection_matrix,
+                       MatrixMul(view_matrix, icon_pos));
+  vr_shell_renderer_->GetOverlayIconRenderer()->Draw(
+      combined, ICON_INSECURE_TRANSIENT);
 }
 
 void VrShell::OnPause(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   if (gvr_api_ == nullptr)
     return;
   gvr_api_->PauseTracking();
 }
 
 void VrShell::OnResume(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   if (gvr_api_ == nullptr)
@@ skipping 18 matching lines @@
   // TODO(bshe): ui_text_width_ and ui_tex_height_ should be only used on render
   // thread.
   ui_tex_width_ = width;
   ui_tex_height_ = height;
 }
 
 void VrShell::SetWebVrMode(JNIEnv* env,
                            const base::android::JavaParamRef<jobject>& obj,
                            bool enabled) {
   webvr_mode_ = enabled;
+  if (enabled) {
+    const int warning_seconds = 30;
+    webvr_warning_frames_ = warning_seconds * 60;

[billorr, 2016/09/23 17:52:11]

how often do we miss frames?  can we keep the warning up based on seconds
instead of frames?

+  } else {
+    webvr_warning_frames_ = 0;
+  }
 }
 
 void VrShell::SetWebVRSecureOrigin(bool secure_origin) {
   webvr_secure_origin_ = secure_origin;
 }
 
 void VrShell::SubmitWebVRFrame() {
 }
 
 void VrShell::UpdateWebVRTextureBounds(
@@ skipping 28 matching lines @@
            const JavaParamRef<jobject>& content_web_contents,
            jlong content_window_android) {
   content::ContentViewCore* c_core = content::ContentViewCore::FromWebContents(
       content::WebContents::FromJavaWebContents(content_web_contents));
   return reinterpret_cast<intptr_t>(new VrShell(
       env, obj, c_core,
       reinterpret_cast<ui::WindowAndroid*>(content_window_android)));
 }
 
 }  // namespace vr_shell