Get Mac viewer working with SDL

tools/viewer/sk_app/mac/main_mac.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 "SkTypes.h"
 #include "SkTHash.h"
+#include "SDL.h"
 #include "Timer.h"
 #include "Window_mac.h"
 #include "../Application.h"
 
 using sk_app::Application;
 
-int main(int argc, char**argv) {
-#if 0 
-    // TODO: use Mac main loop
+int main(int argc, char* argv[]) {
+    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS) != 0) {
+        SkDebugf("Could not initialize SDL!\n");
+        return 1;
+    }
 
-    Display* display = XOpenDisplay(nullptr);
+    Application* app = Application::Create(argc, argv, nullptr);
 
-    Application* app = Application::Create(argc, argv, (void*)display);
-
-    // Get the file descriptor for the X display
-    int x11_fd = ConnectionNumber(display);
-    fd_set in_fds;
-
-    SkTHashSet<sk_app::Window_mac*> pendingWindows;
+    SDL_Event event;
     bool done = false;
     while (!done) {
-        // Create a file description set containing x11_fd
-        FD_ZERO(&in_fds);
-        FD_SET(x11_fd, &in_fds);
+        while (SDL_PollEvent(&event)) {
+            switch (event.type) {
+                // events handled by the windows
+                case SDL_WINDOWEVENT:
+                case SDL_MOUSEMOTION:
+                case SDL_MOUSEBUTTONDOWN:
+                case SDL_MOUSEBUTTONUP:
+                case SDL_KEYDOWN:
+                case SDL_KEYUP:
+                    done = sk_app::Window_mac::HandleWindowEvent(event);
+                    break;
+                    
+                case SDL_QUIT:
+                    done = true;
+                    break;
+                    
+                default:
+                    break;
+            }
+        }
 
-        // Set a sleep timer
-        struct timeval tv;
-        tv.tv_usec = 100;
-        tv.tv_sec = 0;
-
-        // Wait for an event on the file descriptor or for timer expiration
-        (void) select(1, &in_fds, NULL, NULL, &tv);
-
-        // Handle XEvents (if any) and flush the input 
-        XEvent event;
-        while (XPending(display) && !done) {
-            XNextEvent(display, &event);
-
-            sk_app::Window_mac* win = sk_app::Window_mac::gWindowMap.find(event.xany.window);
-            // paint and resize events get collapsed
-            switch (event.type) {
-            case Expose: 
-                win->markPendingPaint();
-                pendingWindows.add(win);
-                break;
-            case ConfigureNotify:
-                win->markPendingResize(event.xconfigurerequest.width,
-                                       event.xconfigurerequest.height);
-                pendingWindows.add(win);
-                break;
-            default:
-                if (win->handleEvent(event)) {
-                    done = true;
-                }
-                break;
-            } 
-        }
+        app->onIdle();
     }
-
     delete app;
 
-    XCloseDisplay(display);
-#endif
-    
+    SDL_Quit();
+
     return 0;
 }