More refactoring for Viewer

tools/viewer/win/main_win.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 <windows.h>
-#include <tchar.h>
-
-#include "SkTypes.h"
-#include "Timer.h"
-#include "Window_win.h"
-#include "../Application.h"
-
-using sk_app::Application;
-
-static char* tchar_to_utf8(const TCHAR* str) {
-#ifdef _UNICODE
-    int size = WideCharToMultiByte(CP_UTF8, 0, str, wcslen(str), NULL, 0, NULL, NULL);
-    char* str8 = (char*)sk_malloc_throw(size + 1);
-    WideCharToMultiByte(CP_UTF8, 0, str, wcslen(str), str8, size, NULL, NULL);
-    str8[size] = '\0';
-    return str8;
-#else
-    return _strdup(str);
-#endif
-}
-
-static double now_ms() { return SkTime::GetNSecs() * 1e-6; }
-
-// This file can work with GUI or CONSOLE subsystem types since we define _tWinMain and main().
-
-static int main_common(HINSTANCE hInstance, int show, int argc, char**argv);
-
-int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine,
-                       int nCmdShow) {
-
-    // convert from lpCmdLine to argc, argv.
-    char* argv[4096];
-    int argc = 0;
-    TCHAR exename[1024], *next;
-    int exenameLen = GetModuleFileName(NULL, exename, SK_ARRAY_COUNT(exename));
-    // we're ignoring the possibility that the exe name exceeds the exename buffer
-    (void)exenameLen;
-    argv[argc++] = tchar_to_utf8(exename);
-    TCHAR* arg = _tcstok_s(lpCmdLine, _T(" "), &next);
-    while (arg != NULL) {
-        argv[argc++] = tchar_to_utf8(arg);
-        arg = _tcstok_s(NULL, _T(" "), &next);
-    }
-    int result = main_common(hInstance, nCmdShow, argc, argv);
-    for (int i = 0; i < argc; ++i) {
-        sk_free(argv[i]);
-    }
-    return result;
-}
-
-int main(int argc, char**argv) {
-    return main_common(GetModuleHandle(NULL), SW_SHOW, argc, argv);
-}
-
-static int main_common(HINSTANCE hInstance, int show, int argc, char**argv) {
-
-    Application* app = Application::Create(argc, argv, (void*)hInstance);
-
-    MSG msg = { 0 };
-
-    double currentTime = 0.0;
-    double previousTime = 0.0;
-
-    // Main message loop
-    while (WM_QUIT != msg.message) {
-        if (PeekMessage(&msg, nullptr, 0, 0, PM_REMOVE)) {
-            TranslateMessage(&msg);
-            DispatchMessage(&msg);
-        } else {
-            previousTime = currentTime;
-            currentTime = now_ms();
-            app->onIdle(currentTime - previousTime);
-        }
-    }
-
-    delete app;
-
-    return (int)msg.wParam;
-}