Implement touch control

tools/viewer/sk_app/Window.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 "Window.h"
 
 #include "SkSurface.h"
@@ skipping 34 matching lines @@
 }
 
 bool Window::onKey(Key key, InputState state, uint32_t modifiers) {
     return fKeyFunc(key, state, modifiers, fKeyUserData);
 }
 
 bool Window::onMouse(int x, int y, InputState state, uint32_t modifiers) {
     return fMouseFunc(x, y, state, modifiers, fMouseUserData);
 }
 
+bool Window::onTouch(int owner, InputState state, float x, float y) {
+    void* castedOwner = reinterpret_cast<void*>(owner);
+    switch (state) {
+        case Window::kUp_InputState: {
+            fGesture.touchEnd(castedOwner);
+            break;
+        }
+        case Window::kDown_InputState: {
+            fGesture.touchBegin(castedOwner, x, y);
+            break;
+        }
+        case Window::kMove_InputState: {
+            fGesture.touchMoved(castedOwner, x, y);
+            break;
+        }
+    }
+    inval();
+    return true;
+}
+
 void Window::onPaint() {
     SkSurface* backbuffer = fWindowContext->getBackbufferSurface();
     if (backbuffer) {
         // draw into the canvas of this surface
         SkCanvas* canvas = backbuffer->getCanvas();
 
         fPaintFunc(canvas, fPaintUserData);
 
         canvas->flush();
 
@@ skipping 11 matching lines @@
 }
 
 const DisplayParams& Window::getDisplayParams() {
     return fWindowContext->getDisplayParams();
 }
 
 void Window::setDisplayParams(const DisplayParams& params) {
     fWindowContext->setDisplayParams(params);
 }
 
+const SkMatrix& Window::getGestureLocalM() {
+    return fGesture.localM();
+}
+
+const SkMatrix& Window::getGestureGlobalM() const {
+    return fGesture.globalM();
+}
+
 }   // namespace sk_app