android/apps: Add CanvasProof App;

platform_tools/android/apps/canvasproof/src/main/java/org/skia/canvasproof/CanvasProofActivity.java

Index: platform_tools/android/apps/canvasproof/src/main/java/org/skia/canvasproof/CanvasProofActivity.java
diff --git a/platform_tools/android/apps/canvasproof/src/main/java/org/skia/canvasproof/CanvasProofActivity.java b/platform_tools/android/apps/canvasproof/src/main/java/org/skia/canvasproof/CanvasProofActivity.java
new file mode 100644
index 0000000000000000000000000000000000000000..afb6ebc5533ab5fe0b31994639f7590bc91f6b24
--- /dev/null
+++ b/platform_tools/android/apps/canvasproof/src/main/java/org/skia/canvasproof/CanvasProofActivity.java
@@ -0,0 +1,197 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+package org.skia.canvasproof;
+
+import android.app.Activity;
+import android.content.res.AssetManager;
+import android.graphics.Picture;
+import android.opengl.GLSurfaceView;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.Gravity;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.LinearLayout.LayoutParams;
+import android.widget.LinearLayout;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class CanvasProofActivity extends Activity {
+    private static final String TAG = "CanvasProofActivity";
+    private GaneshPictureRenderer ganeshPictureRenderer;
+    private HwuiPictureView hwuiPictureView;
+    private GLSurfaceView ganeshPictureView;
+    private LinearLayout splitPaneView;
+    private View currentView;
+    private float x, y;
+    private int resourcesIndex;
+    private class PictureAsset {
+        public String path;
+        public long ptr;
+        public Picture picture;
+    };
+    private PictureAsset[] assets;
+
+    @SuppressWarnings("deprecation")  // purposely using this
+    private static Picture ReadPicture(InputStream inputStream)
+        throws IOException {
+        Picture p = null;
+        try {
+            p = Picture.createFromStream(inputStream);
+        } catch (java.lang.Exception e) {
+            Log.e(TAG, "Exception in Picture.createFromStream", e);
+        }
+        inputStream.close();
+        return p;
+    }
+
+    private void getAssetPaths() {
+        String directory = "skps";
+        AssetManager mgr = this.getAssets();
+        assert (mgr != null);
+        String[] resources;
+        try {
+            resources = mgr.list(directory);
+        } catch (IOException e) {
+            Log.e(TAG, "IOException in getAssetPaths", e);
+            return;
+        }
+        if (resources == null || resources.length == 0) {
+            Log.e(TAG, "SKP assets should be packaged in " +
+                  ".../apps/canvasproof/src/main/assets/skps/" +
+                  ", but none were found.");
+            return;
+        }
+        CreateSkiaPicture.init();
+        this.assets = new PictureAsset[resources.length];
+        for (int i = 0; i < resources.length; ++i) {
+            String path = directory + File.separator + resources[i];
+            this.assets[i] = new PictureAsset();
+            this.assets[i].path = path;
+            try {
+                this.assets[i].ptr = CreateSkiaPicture.create(mgr.open(path));
+                if (0 == this.assets[i].ptr) {
+                    Log.e(TAG, "CreateSkiaPicture.create returned 0 " + path);
+                }
+                Picture p = CanvasProofActivity.ReadPicture(mgr.open(path));
+                if (null == p) {
+                    Log.e(TAG, "CanvasProofActivity.ReadPicture.create " +
+                          "returned null " + path);
+                } else if (0 == p.getHeight() || 0 == p.getWidth()) {
+                    Log.e(TAG, "CanvasProofActivity.ReadPicture.create " +
+                          "empty picture" + path);
+                    p = null;
+                }
+                this.assets[i].picture = p;
+            } catch (IOException e) {
+                Log.e(TAG, "IOException in getAssetPaths " + path + e);
+                return;
+            }
+        }
+    }
+
+    private void nextView() {
+        if (this.currentView == this.hwuiPictureView) {
+            this.currentView = this.ganeshPictureView;
+        } else if (this.currentView == null ||
+                   this.currentView == this.ganeshPictureView) {
+            this.setContentView(new View(this));
+            LayoutParams layoutParams =
+                new LayoutParams(
+                        LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, 0.5f);
+            this.ganeshPictureView.setLayoutParams(layoutParams);
+            this.splitPaneView.addView(this.ganeshPictureView);
+            this.hwuiPictureView.setLayoutParams(layoutParams);
+            this.splitPaneView.addView(this.hwuiPictureView);
+            this.currentView = this.splitPaneView;
+        } else if (this.currentView == this.splitPaneView) {
+            this.splitPaneView.removeAllViews();
+            this.currentView = this.hwuiPictureView;
+        } else {
+            Log.e(TAG, "unexpected value");
+            this.setContentView(null);
+            return;
+        }
+        this.setContentView(this.currentView);
+        this.currentView.invalidate();
+    }
+
+    private void nextPicture(int d) {
+        if (this.assets == null) {
+            Log.w(TAG, "this.assets == null");
+            return;
+        }
+        assert (this.assets.length > 0);
+        resourcesIndex = (resourcesIndex + d) % this.assets.length;
+        while (resourcesIndex < 0) {
+            resourcesIndex += this.assets.length;
+        }
+        while (resourcesIndex >= this.assets.length) {
+            resourcesIndex -= this.assets.length;
+        }
+        this.ganeshPictureRenderer.setPicture(assets[resourcesIndex].ptr);
+        this.hwuiPictureView.setPicture(assets[resourcesIndex].picture);
+        this.currentView.invalidate();
+    }
+
+    @Override
+    protected void onStop() {
+        this.ganeshPictureRenderer.releaseResources();
+        super.onStop();
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        this.getAssetPaths();
+        this.ganeshPictureRenderer = new GaneshPictureRenderer();
+        this.hwuiPictureView = new HwuiPictureView(this);
+
+        this.ganeshPictureRenderer.setScale(2.0f);
+        this.hwuiPictureView.setScale(2.0f);
+        this.ganeshPictureView = ganeshPictureRenderer.makeView(this);
+        this.splitPaneView = new LinearLayout(this);
+        this.splitPaneView.setOrientation(LinearLayout.VERTICAL);
+        this.splitPaneView.setGravity(Gravity.FILL);
+
+        LayoutParams layoutParams =
+            new LayoutParams(
+                    LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, 0.5f);
+        this.ganeshPictureView.setLayoutParams(layoutParams);
+        this.hwuiPictureView.setLayoutParams(layoutParams);
+
+        this.nextView();
+        this.nextPicture(0);
+    }
+
+    @Override
+    public boolean dispatchTouchEvent (MotionEvent event) {
+        switch(event.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+                this.x = event.getX();
+                this.y = event.getY();
+                break;
+            case MotionEvent.ACTION_UP:
+                float dx = event.getX() - this.x;
+                float dy = event.getY() - this.y;
+                float dx2 = dx * dx;
+                float dy2 = dy * dy;
+                if (dx2 + dy2 > 22500.0) {
+                    if (dy2 < dx2) {
+                        this.nextPicture(dx > 0 ? 1 : -1);
+                    } else if (dy > 0) {
+                        this.nextView();
+                    }
+                }
+                break;
+        }
+        return super.onTouchEvent(event);
+    }
+}