android/apps: Add CanvasProof App;

platform_tools/android/apps/canvasproof/src/main/java/org/skia/canvasproof/GaneshPictureRenderer.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.
+ */
+
+// AJAR=$ANDROID_SDK_ROOT/platforms/android-19/android.jar
+// SRC=platform_tools/android/apps/canvasproof/src/main
+// javac -classpath $AJAR $SRC/java/org/skia/canvasproof/GaneshPictureRenderer.java
+// javah -classpath $AJAR:$SRC/java -d $SRC/jni org.skia.canvasproof.GaneshPictureRenderer
+
+package org.skia.canvasproof;
+
+import android.graphics.Rect;
+import android.opengl.GLSurfaceView;
+import android.util.Log;
+import java.io.InputStream;
+import java.io.IOException;
+import java.lang.Throwable;
+import java.lang.UnsatisfiedLinkError;
+import javax.microedition.khronos.egl.EGLConfig;
+import javax.microedition.khronos.opengles.GL10;
+
+public class GaneshPictureRenderer implements GLSurfaceView.Renderer {
+    private static final String TAG = "GaneshPictureRenderer";
+    GaneshPictureRenderer() {
+        try {
+            System.loadLibrary("skia_android");
+            System.loadLibrary("canvasproof");
+        } catch (java.lang.Error e) {
+            Log.e(TAG, "System.loadLibrary error", e);
+            return;
+        }
+        this.scale = 1;
+    }
+    public android.opengl.GLSurfaceView makeView(

[tomhudson, 2015/08/24 20:10:25]

Nit: You've imported GLSurfaceView; do you really need to fully qualify it here?

[hal.canary, 2015/08/31 21:16:56]

Done.

For consistency, I'm prefer import statements to fully-qualified names.  But I
forgot here.

+            android.app.Activity activity) {
+        this.view = new GLSurfaceView(activity);
+        this.view.setEGLConfigChooser(8, 8, 8, 8, 0, 8);
+        this.view.setEGLContextClientVersion(2);
+        this.view.setRenderer(this);
+        this.view.setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
+        return this.view;
+    }
+    static public Rect cullRect(long picturePtr) {
+        Rect rect = new Rect();
+        try {
+            GaneshPictureRenderer.GetCullRect(rect, picturePtr);
+        } catch (UnsatisfiedLinkError e) {
+            Log.e(TAG, "GetCullRect failed", e);
+        }
+        return rect;
+    }
+    public void setPicture(long picturePtr) {
+        this.picturePtr = picturePtr;
+        this.view.requestRender();
+    }
+    public void setScale(float s) { this.scale = s; }
+
+    public void releaseResources() {
+        if (this.contextPtr != 0) {
+            try {
+                GaneshPictureRenderer.CleanUp(this.contextPtr);
+            } catch (UnsatisfiedLinkError e) {
+                Log.e(TAG, "CleanUp failed", e);
+            }
+        }
+        this.contextPtr = 0;
+    }
+
+    private void createContext() {
+        try {
+            this.contextPtr = GaneshPictureRenderer.Ctor();
+        } catch (UnsatisfiedLinkError e) {
+            Log.e(TAG, "Ctor failed", e);
+        }
+    }
+
+    @Override
+    public void onSurfaceCreated(GL10 gl, EGLConfig c) {
+        this.releaseResources();
+        this.createContext();
+    }
+    @Override
+    public void onDrawFrame(GL10 gl) {
+        if (this.contextPtr == 0) {
+            this.createContext();
+        }
+        if (this.width > 0 && this.height > 0 &&
+            this.contextPtr != 0 && this.picturePtr != 0) {
+            try {
+                GaneshPictureRenderer.DrawThisFrame(
+                        this.width, this.height, this.scale,
+                        this.contextPtr, this.picturePtr);
+            } catch (UnsatisfiedLinkError e) {
+                Log.e(TAG, "DrawThisFrame failed", e);
+            }
+        }
+    }
+    @Override
+    public void onSurfaceChanged(GL10 gl, int w, int h) {
+        this.width = w;
+        this.height = h;
+    }
+    @Override
+    public void finalize() throws Throwable {
+        super.finalize();
+        this.releaseResources();
+    }
+    private long picturePtr;
+    private long contextPtr;
+    private float scale;
+    private int width;
+    private int height;
+    private GLSurfaceView view;
+
+    // Make the native functions static to simplify JNI interaction.
+    private static native void DrawThisFrame(int w, int h, float s, long pr, long pc);
+    private static native long Ctor();
+    private static native void CleanUp(long p);
+    private static native void GetCullRect(Rect r, long picture);
+}