Clean up Xlib viewer

tools/viewer/Viewer.cpp

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "Viewer.h"
 
 #include "GMSlide.h"
@@ skipping 118 matching lines @@
     for (int i = 1; i < argc; ++i) {
         SkDebugf("%s ", argv[i]);
     }
     SkDebugf("\n");
 
     SkCommandLineFlags::Parse(argc, argv);
 
     fBackendType = get_backend_type(FLAGS_backend[0]);
     fWindow = Window::CreateNativeWindow(platformData);
     fWindow->attach(fBackendType, DisplayParams());
+#if defined(SK_VULKAN) && defined(SK_BUILD_FOR_UNIX)
+    // Vulkan doesn't seem to handle a single refresh properly on Linux
+    fRefresh = (sk_app::Window::kVulkan_BackendType == fBackendType);
+#endif
 
     // register callbacks
     fCommands.attach(fWindow);
     fWindow->registerPaintFunc(on_paint_handler, this);
     fWindow->registerTouchFunc(on_touch_handler, this);
     fWindow->registerUIStateChangedFunc(on_ui_state_changed_handler, this);
 
     // add key-bindings
     fCommands.addCommand('s', "Overlays", "Toggle stats display", [this]() {
         this->fDisplayStats = !this->fDisplayStats;
@@ skipping 55 matching lines @@
             fWindow = Window::CreateNativeWindow(nullptr);
 
             // re-register callbacks
             fCommands.attach(fWindow);
             fWindow->registerPaintFunc(on_paint_handler, this);
             fWindow->registerTouchFunc(on_touch_handler, this);
             fWindow->registerUIStateChangedFunc(on_ui_state_changed_handler, this);
         }
 #endif
         fWindow->attach(fBackendType, DisplayParams());
+#if defined(SK_VULKAN) && defined(SK_BUILD_FOR_UNIX)
+        // Vulkan doesn't seem to handle a single refresh properly on Linux
+        fRefresh = (sk_app::Window::kVulkan_BackendType == fBackendType);
+#endif
 
         this->updateTitle();
         fWindow->inval();
         fWindow->show();
     });
 #endif
 
     // set up slides
     this->initSlides();
 
@@ skipping 422 matching lines @@
             updateUIState();
         }
     } else if (stateName.equals(kRefreshStateName)) {
         // This state is actually NOT in the UI state.
         // We use this to allow Android to quickly set bool fRefresh.
         fRefresh = stateValue.equals(kON);
     } else {
         SkDebugf("Unknown stateName: %s", stateName.c_str());
     }
 }