1 files changed, 275 insertions, 0 deletions
diff --git a/mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/LayerRenderer.java b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/LayerRenderer.java
new file mode 100644
index 000000000..1a087cc2a
--- /dev/null
+++ b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/LayerRenderer.java
@@ -0,0 +1,275 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.gfx;
+
+import org.mozilla.gecko.AppConstants;
+import org.mozilla.gecko.GeckoAppShell;
+import org.mozilla.gecko.mozglue.DirectBufferAllocator;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Matrix;
+import android.graphics.PointF;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.opengl.GLES20;
+import android.os.SystemClock;
+import android.util.Log;
+
+import org.mozilla.gecko.annotation.WrapForJNI;
+import org.mozilla.gecko.util.ThreadUtils;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
+import java.nio.IntBuffer;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.microedition.khronos.egl.EGLConfig;
+
+/**
+ * The layer renderer implements the rendering logic for a layer view.
+ */
+public class LayerRenderer {
+    private static final String LOGTAG = "GeckoLayerRenderer";
+
+    /*
+     * The amount of time a frame is allowed to take to render before we declare it a dropped
+     * frame.
+     */
+    private static final int MAX_FRAME_TIME = 16;   /* 1000 ms / 60 FPS */
+    private static final long NANOS_PER_MS = 1000000;
+    private static final int MAX_SCROLL_SPEED_TO_REQUEST_ZOOM_RENDER = 5;
+
+    private final LayerView mView;
+    private ByteBuffer mCoordByteBuffer;
+    private FloatBuffer mCoordBuffer;
+    private int mMaxTextureSize;
+
+    private long mLastFrameTime;
+    private final CopyOnWriteArrayList<RenderTask> mTasks;
+
+    // Dropped frames display
+    private final int[] mFrameTimings;
+    private int mCurrentFrame, mFrameTimingsSum, mDroppedFrames;
+
+    private IntBuffer mPixelBuffer;
+    private List<LayerView.ZoomedViewListener> mZoomedViewListeners;
+    private float mLastViewLeft;
+    private float mLastViewTop;
+
+    public LayerRenderer(LayerView view) {
+        mView = view;
+
+        mTasks = new CopyOnWriteArrayList<RenderTask>();
+        mLastFrameTime = System.nanoTime();
+
+        mFrameTimings = new int[60];
+        mCurrentFrame = mFrameTimingsSum = mDroppedFrames = 0;
+
+        mZoomedViewListeners = new ArrayList<LayerView.ZoomedViewListener>();
+    }
+
+    public void destroy() {
+        if (mCoordByteBuffer != null) {
+            DirectBufferAllocator.free(mCoordByteBuffer);
+            mCoordByteBuffer = null;
+            mCoordBuffer = null;
+        }
+        mZoomedViewListeners.clear();
+    }
+
+    void onSurfaceCreated(EGLConfig config) {
+        createDefaultProgram();
+    }
+
+    public void createDefaultProgram() {
+        int maxTextureSizeResult[] = new int[1];
+        GLES20.glGetIntegerv(GLES20.GL_MAX_TEXTURE_SIZE, maxTextureSizeResult, 0);
+        mMaxTextureSize = maxTextureSizeResult[0];
+    }
+
+    public int getMaxTextureSize() {
+        return mMaxTextureSize;
+    }
+
+    public void postRenderTask(RenderTask aTask) {
+        mTasks.add(aTask);
+        mView.requestRender();
+    }
+
+    public void removeRenderTask(RenderTask aTask) {
+        mTasks.remove(aTask);
+    }
+
+    private void runRenderTasks(CopyOnWriteArrayList<RenderTask> tasks, boolean after, long frameStartTime) {
+        for (RenderTask task : tasks) {
+            if (task.runAfter != after) {
+                continue;
+            }
+
+            boolean stillRunning = task.run(frameStartTime - mLastFrameTime, frameStartTime);
+
+            // Remove the task from the list if its finished
+            if (!stillRunning) {
+                tasks.remove(task);
+            }
+        }
+    }
+
+    /** Used by robocop for testing purposes. Not for production use! */
+    IntBuffer getPixels() {
+        IntBuffer pixelBuffer = IntBuffer.allocate(mView.getWidth() * mView.getHeight());
+        synchronized (pixelBuffer) {
+            mPixelBuffer = pixelBuffer;
+            mView.requestRender();
+            try {
+                pixelBuffer.wait();
+            } catch (InterruptedException ie) {
+            }
+            mPixelBuffer = null;
+        }
+        return pixelBuffer;
+    }
+
+    private void updateDroppedFrames(long frameStartTime) {
+        int frameElapsedTime = (int)((System.nanoTime() - frameStartTime) / NANOS_PER_MS);
+
+        /* Update the running statistics. */
+        mFrameTimingsSum -= mFrameTimings[mCurrentFrame];
+        mFrameTimingsSum += frameElapsedTime;
+        mDroppedFrames -= (mFrameTimings[mCurrentFrame] + 1) / MAX_FRAME_TIME;
+        mDroppedFrames += (frameElapsedTime + 1) / MAX_FRAME_TIME;
+
+        mFrameTimings[mCurrentFrame] = frameElapsedTime;
+        mCurrentFrame = (mCurrentFrame + 1) % mFrameTimings.length;
+
+        int averageTime = mFrameTimingsSum / mFrameTimings.length;
+    }
+
+    public Frame createFrame(ImmutableViewportMetrics metrics) {
+        return new Frame(metrics);
+    }
+
+    public class Frame {
+        // The timestamp recording the start of this frame.
+        private long mFrameStartTime;
+        // A fixed snapshot of the viewport metrics that this frame is using to render content.
+        private final ImmutableViewportMetrics mFrameMetrics;
+
+        public Frame(ImmutableViewportMetrics metrics) {
+            mFrameMetrics = metrics;
+        }
+
+        /** This function is invoked via JNI; be careful when modifying signature. */
+        @WrapForJNI
+        public void beginDrawing() {
+            mFrameStartTime = System.nanoTime();
+
+            // Run through pre-render tasks
+            runRenderTasks(mTasks, false, mFrameStartTime);
+        }
+
+
+        private void maybeRequestZoomedViewRender() {
+            // Concurrently update of mZoomedViewListeners should not be an issue here
+            // because the following line is just a short-circuit
+            if (mZoomedViewListeners.size() == 0) {
+                return;
+            }
+
+            // When scrolling fast, do not request zoomed view render to avoid to slow down
+            // the scroll in the main view.
+            // Speed is estimated using the offset changes between 2 display frame calls
+            final float viewLeft = Math.round(mFrameMetrics.getViewport().left);
+            final float viewTop = Math.round(mFrameMetrics.getViewport().top);
+            boolean shouldWaitToRender = false;
+
+            if (Math.abs(mLastViewLeft - viewLeft) > MAX_SCROLL_SPEED_TO_REQUEST_ZOOM_RENDER ||
+                Math.abs(mLastViewTop - viewTop) > MAX_SCROLL_SPEED_TO_REQUEST_ZOOM_RENDER) {
+                shouldWaitToRender = true;
+            }
+
+            mLastViewLeft = viewLeft;
+            mLastViewTop = viewTop;
+
+            if (shouldWaitToRender) {
+                return;
+            }
+
+            ThreadUtils.postToUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    for (LayerView.ZoomedViewListener listener : mZoomedViewListeners) {
+                        listener.requestZoomedViewRender();
+                    }
+                }
+            });
+        }
+
+
+        /** This function is invoked via JNI; be careful when modifying signature. */
+        @WrapForJNI
+        public void endDrawing() {
+            PanningPerfAPI.recordFrameTime();
+
+            runRenderTasks(mTasks, true, mFrameStartTime);
+            maybeRequestZoomedViewRender();
+
+            /* Used by robocop for testing purposes */
+            IntBuffer pixelBuffer = mPixelBuffer;
+            if (pixelBuffer != null) {
+                synchronized (pixelBuffer) {
+                    pixelBuffer.position(0);
+                    GLES20.glReadPixels(0, 0, Math.round(mFrameMetrics.getWidth()),
+                                        Math.round(mFrameMetrics.getHeight()), GLES20.GL_RGBA,
+                                        GLES20.GL_UNSIGNED_BYTE, pixelBuffer);
+                    pixelBuffer.notify();
+                }
+            }
+
+            // Remove background color once we've painted. GeckoLayerClient is
+            // responsible for setting this flag before current document is
+            // composited.
+            if (mView.getPaintState() == LayerView.PAINT_BEFORE_FIRST) {
+                mView.post(new Runnable() {
+                    @Override
+                    public void run() {
+                        mView.setSurfaceBackgroundColor(Color.TRANSPARENT);
+                    }
+                });
+                mView.setPaintState(LayerView.PAINT_AFTER_FIRST);
+            }
+            mLastFrameTime = mFrameStartTime;
+        }
+    }
+
+    public void updateZoomedView(final ByteBuffer data) {
+        ThreadUtils.postToUiThread(new Runnable() {
+            @Override
+            public void run() {
+                for (LayerView.ZoomedViewListener listener : mZoomedViewListeners) {
+                    data.position(0);
+                    listener.updateView(data);
+                }
+            }
+        });
+    }
+
+    public void addZoomedViewListener(LayerView.ZoomedViewListener listener) {
+        ThreadUtils.assertOnUiThread();
+        mZoomedViewListeners.add(listener);
+    }
+
+    public void removeZoomedViewListener(LayerView.ZoomedViewListener listener) {
+        ThreadUtils.assertOnUiThread();
+        mZoomedViewListeners.remove(listener);
+    }
+}