android/apps: Add CanvasProof App;

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

+/*
+ * 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.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Picture;
+import android.util.Log;
+import android.view.View;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class HwuiPictureView extends View {
+    private static final String TAG = "HwuiPictureView";
+    private Picture picture;
+    private float scale;
+    private Picture defaultPicture;
+
+    public boolean fullTime;
+
+    HwuiPictureView(Context context) {
+        super(context);
+        this.scale = 1.0f;
+    }
+    public void setScale(float s) {
+        this.scale = s;
+    }
+    public void setPicture(Picture p) {
+        this.picture = p;
+        this.invalidate();
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        if (this.picture != null) {
+            canvas.save();
+            canvas.scale(scale, scale);
+            HwuiPictureView.draw(canvas, this.picture);
+            canvas.restore();
+            if (fullTime) {
+                this.invalidate();
+            }
+        }
+    }
+
+    static private void draw(Canvas canvas, Picture p) {
+        if (android.os.Build.VERSION.SDK_INT > 22) {
+            try {
+                canvas.drawPicture(p);
+                return;
+            } catch (java.lang.Exception e) {
+                Log.e(TAG, "Exception while drawing picture in Hwui");
+            }
+        }
+        if (p.getWidth() > 0 && p.getHeight() > 0) {
+            // Fallback to software rendering.
+            Bitmap bm = Bitmap.createBitmap(p.getWidth(), p.getHeight(),
+                                            Bitmap.Config.ARGB_8888);
+            (new Canvas(bm)).drawPicture(p);
+            canvas.drawBitmap(bm, 0.0f, 0.0f, null);
+            bm.recycle();
+        }
+    }
+}