Allow fine-grained control over functors execution

Adds non-drawing execution mode

Change-Id: I82f92cf1b9a3b9ff2ca6d7427c4e02b73e04e6bf

8 files changed, 148 insertions, 30 deletions

diff --git a/core/java/android/os/Message.java b/core/java/android/os/Message.java
index b816b11..4aa7fe2 100644
--- a/core/java/android/os/Message.java
+++ b/core/java/android/os/Message.java
@@ -16,9 +16,6 @@
 
 package android.os;
 
-import android.os.Bundle;
-import android.os.Parcel;
-import android.os.Parcelable;
 import android.util.TimeUtils;
 
 /**
@@ -368,13 +365,13 @@ public final class Message implements Parcelable {
      *
      * Asynchronous messages represent interrupts or events that do not require global ordering
      * with represent to synchronous messages.  Asynchronous messages are not subject to
-     * the synchronization barriers introduced by {@link MessageQueue#acquireSyncBarrier()}.
+     * the synchronization barriers introduced by {@link MessageQueue#enqueueSyncBarrier(long)}.
      *
      * @return True if the message is asynchronous.
      *
      * @see #setAsynchronous(boolean)
-     * @see MessageQueue#acquireSyncBarrier()
-     * @see MessageQueue#releaseSyncBarrier()
+     * @see MessageQueue#enqueueSyncBarrier(long)
+     * @see MessageQueue#removeSyncBarrier(int)
      *
      * @hide
      */
@@ -387,13 +384,13 @@ public final class Message implements Parcelable {
      *
      * Asynchronous messages represent interrupts or events that do not require global ordering
      * with represent to synchronous messages.  Asynchronous messages are not subject to
-     * the synchronization barriers introduced by {@link MessageQueue#acquireSyncBarrier()}.
+     * the synchronization barriers introduced by {@link MessageQueue#enqueueSyncBarrier(long)}.
      *
      * @param async True if the message is asynchronous.
      *
      * @see #isAsynchronous()
-     * @see MessageQueue#acquireSyncBarrier()
-     * @see MessageQueue#releaseSyncBarrier()
+     * @see MessageQueue#enqueueSyncBarrier(long)
+     * @see MessageQueue#removeSyncBarrier(int)
      *
      * @hide
      */
@@ -506,7 +503,7 @@ public final class Message implements Parcelable {
         Messenger.writeMessengerOrNullToParcel(replyTo, dest);
     }
 
-    private final void readFromParcel(Parcel source) {
+    private void readFromParcel(Parcel source) {
         what = source.readInt();
         arg1 = source.readInt();
         arg2 = source.readInt();
diff --git a/core/java/android/view/GLES20Canvas.java b/core/java/android/view/GLES20Canvas.java
index 5b0433e..bedafc7 100644
--- a/core/java/android/view/GLES20Canvas.java
+++ b/core/java/android/view/GLES20Canvas.java
@@ -259,6 +259,13 @@ class GLES20Canvas extends HardwareCanvas {
 
     private static native int nCallDrawGLFunction(int renderer, int drawGLFunction);
 
+    @Override
+    public int invokeFunctors(Rect dirty) {
+        return nInvokeFunctors(mRenderer, dirty);
+    }
+
+    private static native int nInvokeFunctors(int renderer, Rect dirty);
+
     ///////////////////////////////////////////////////////////////////////////
     // Memory
     ///////////////////////////////////////////////////////////////////////////
diff --git a/core/java/android/view/HardwareCanvas.java b/core/java/android/view/HardwareCanvas.java
index 2636ea2..de8c62d 100644
--- a/core/java/android/view/HardwareCanvas.java
+++ b/core/java/android/view/HardwareCanvas.java
@@ -98,4 +98,16 @@ public abstract class HardwareCanvas extends Canvas {
         // Noop - this is done in the display list recorder subclass
         return DisplayList.STATUS_DONE;
     }
+
+    /**
+     * Invoke all the functors who requested to be invoked during the previous frame.
+     * 
+     * @param dirty The region to redraw when the functors return {@link DisplayList#STATUS_DRAW}
+     *              
+     * @return One of {@link DisplayList#STATUS_DONE}, {@link DisplayList#STATUS_DRAW} or
+     *         {@link DisplayList#STATUS_INVOKE}
+     */
+    public int invokeFunctors(Rect dirty) {
+        return DisplayList.STATUS_DONE;
+    }
 }
diff --git a/core/java/android/view/HardwareRenderer.java b/core/java/android/view/HardwareRenderer.java
index 133f601..b100a0c 100644
--- a/core/java/android/view/HardwareRenderer.java
+++ b/core/java/android/view/HardwareRenderer.java
@@ -502,7 +502,9 @@ public abstract class HardwareRenderer {
         static final int SURFACE_STATE_ERROR = 0;
         static final int SURFACE_STATE_SUCCESS = 1;
         static final int SURFACE_STATE_UPDATED = 2;
-        
+
+        static final int FUNCTOR_PROCESS_DELAY = 2;
+
         static EGL10 sEgl;
         static EGLDisplay sEglDisplay;
         static EGLConfig sEglConfig;
@@ -549,7 +551,9 @@ public abstract class HardwareRenderer {
         private boolean mDestroyed;
 
         private final Rect mRedrawClip = new Rect();
+
         private final int[] mSurfaceSize = new int[2];
+        private final FunctorsRunnable mFunctorsRunnable = new FunctorsRunnable();
 
         GlRenderer(int glVersion, boolean translucent) {
             mGlVersion = glVersion;
@@ -957,6 +961,24 @@ public abstract class HardwareRenderer {
         void onPostDraw() {
         }
 
+        class FunctorsRunnable implements Runnable {
+            View.AttachInfo attachInfo;
+
+            @Override
+            public void run() {
+                final HardwareRenderer renderer = attachInfo.mHardwareRenderer;
+                if (renderer == null || !renderer.isEnabled() || renderer != GlRenderer.this) {
+                    return;
+                }
+
+                final int surfaceState = checkCurrent();
+                if (surfaceState != SURFACE_STATE_ERROR) {
+                    int status = mCanvas.invokeFunctors(mRedrawClip);
+                    handleFunctorStatus(attachInfo, status);
+                }
+            }
+        }
+
         @Override
         boolean draw(View view, View.AttachInfo attachInfo, HardwareDrawCallbacks callbacks,
                 Rect dirty) {
@@ -1051,15 +1073,7 @@ public abstract class HardwareRenderer {
                                 }
                             }
 
-                            if (status != DisplayList.STATUS_DONE) {
-                                if (mRedrawClip.isEmpty()) {
-                                    attachInfo.mViewRootImpl.invalidate();
-                                } else {
-                                    attachInfo.mViewRootImpl.invalidateChildInParent(
-                                            null, mRedrawClip);
-                                    mRedrawClip.setEmpty();
-                                }
-                            }
+                            handleFunctorStatus(attachInfo, status);
                         } else {
                             // Shouldn't reach here
                             view.draw(canvas);
@@ -1111,6 +1125,26 @@ public abstract class HardwareRenderer {
             return false;
         }
 
+        private void handleFunctorStatus(View.AttachInfo attachInfo, int status) {
+            // If the draw flag is set, functors will be invoked while executing
+            // the tree of display lists
+            if ((status & DisplayList.STATUS_DRAW) != 0) {
+                if (mRedrawClip.isEmpty()) {
+                    attachInfo.mViewRootImpl.invalidate();
+                } else {
+                    attachInfo.mViewRootImpl.invalidateChildInParent(null, mRedrawClip);
+                    mRedrawClip.setEmpty();
+                }
+            }
+
+            if ((status & DisplayList.STATUS_INVOKE) != 0) {
+                attachInfo.mHandler.removeCallbacks(mFunctorsRunnable);
+                mFunctorsRunnable.attachInfo = attachInfo;
+                // delay the functor callback by a few ms so it isn't polled constantly
+                attachInfo.mHandler.postDelayed(mFunctorsRunnable, FUNCTOR_PROCESS_DELAY);
+            }
+        }
+
         /**
          * Ensures the current EGL context is the one we expect.
          * 
diff --git a/core/jni/android_view_GLES20Canvas.cpp b/core/jni/android_view_GLES20Canvas.cpp
index b472eef..6028814 100644
--- a/core/jni/android_view_GLES20Canvas.cpp
+++ b/core/jni/android_view_GLES20Canvas.cpp
@@ -163,6 +163,21 @@ static jint android_view_GLES20Canvas_callDrawGLFunction(JNIEnv* env, jobject cl
     return renderer->callDrawGLFunction(functor, dirty);
 }
 
+static jint android_view_GLES20Canvas_invokeFunctors(JNIEnv* env,
+        jobject clazz, OpenGLRenderer* renderer, jobject dirty) {
+    android::uirenderer::Rect bounds;
+    status_t status = renderer->invokeFunctors(bounds);
+    if (status != DrawGlInfo::kStatusDone && dirty != NULL) {
+        env->CallVoidMethod(dirty, gRectClassInfo.set,
+                int(bounds.left), int(bounds.top), int(bounds.right), int(bounds.bottom));
+    }
+    return status;
+}
+
+// ----------------------------------------------------------------------------
+// Misc
+// ----------------------------------------------------------------------------
+
 static jint android_view_GLES20Canvas_getMaxTextureWidth(JNIEnv* env, jobject clazz) {
     return Caches::getInstance().maxTextureSize;
 }
@@ -824,6 +839,8 @@ static JNINativeMethod gMethods[] = {
     { "nGetStencilSize",    "()I",             (void*) android_view_GLES20Canvas_getStencilSize },
 
     { "nCallDrawGLFunction", "(II)I",          (void*) android_view_GLES20Canvas_callDrawGLFunction },
+    { "nInvokeFunctors",         "(ILandroid/graphics/Rect;)I",
+            (void*) android_view_GLES20Canvas_invokeFunctors },
 
     { "nSave",              "(II)I",           (void*) android_view_GLES20Canvas_save },
     { "nRestore",           "(I)V",            (void*) android_view_GLES20Canvas_restore },
@@ -899,9 +916,9 @@ static JNINativeMethod gMethods[] = {
     { "nDestroyDisplayList",     "(I)V",       (void*) android_view_GLES20Canvas_destroyDisplayList },
     { "nGetDisplayListSize",     "(I)I",       (void*) android_view_GLES20Canvas_getDisplayListSize },
     { "nSetDisplayListName",     "(ILjava/lang/String;)V",
-                                               (void*) android_view_GLES20Canvas_setDisplayListName },
+            (void*) android_view_GLES20Canvas_setDisplayListName },
     { "nDrawDisplayList",        "(IIIILandroid/graphics/Rect;I)I",
-                                               (void*) android_view_GLES20Canvas_drawDisplayList },
+            (void*) android_view_GLES20Canvas_drawDisplayList },
 
     { "nCreateDisplayListRenderer", "()I",     (void*) android_view_GLES20Canvas_createDisplayListRenderer },
     { "nResetDisplayListRenderer",  "(I)V",    (void*) android_view_GLES20Canvas_resetDisplayListRenderer },
diff --git a/include/private/hwui/DrawGlInfo.h b/include/private/hwui/DrawGlInfo.h
index abcf41d..8028bf3 100644
--- a/include/private/hwui/DrawGlInfo.h
+++ b/include/private/hwui/DrawGlInfo.h
@@ -44,20 +44,31 @@ struct DrawGlInfo {
     float dirtyBottom;
 
     /**
+     * Values used as the "what" parameter of the functor.
+     */
+    enum Mode {
+        // Indicates that the functor is called to perform a draw
+        kModeDraw,
+        // Indicates the the functor is called only to perform
+        // processing and that no draw should be attempted
+        kModeProcess
+    };
+
+    /**
      * Values used by OpenGL functors to tell the framework
      * what to do next.
      */
     enum Status {
         // The functor is done
-        kStatusDone,
+        kStatusDone = 0x0,
         // The functor is requesting a redraw (the clip rect
         // used by the redraw is specified by DrawGlInfo.)
         // The rest of the UI might redraw too.
-        kStatusDraw,
+        kStatusDraw = 0x1,
         // The functor needs to be invoked again but will
         // not redraw. Only the functor is invoked again
         // (unless another functor requests a redraw.)
-        kStatusInvoke
+        kStatusInvoke = 0x2
     };
 }; // struct DrawGlInfo
 
diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index eb4b83b..39be5ed 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -166,6 +166,7 @@ void OpenGLRenderer::prepare(bool opaque) {
 
 void OpenGLRenderer::prepareDirty(float left, float top, float right, float bottom, bool opaque) {
     mCaches.clearGarbage();
+    mFunctors.clear();
 
     mSnapshot = new Snapshot(mFirstSnapshot,
             SkCanvas::kMatrix_SaveFlag | SkCanvas::kClip_SaveFlag);
@@ -236,7 +237,39 @@ void OpenGLRenderer::resume() {
     glBlendEquation(GL_FUNC_ADD);
 }
 
-status_t OpenGLRenderer::callDrawGLFunction(Functor *functor, Rect& dirty) {
+status_t OpenGLRenderer::invokeFunctors(Rect& dirty) {
+    status_t result = DrawGlInfo::kStatusDone;
+
+    Vector<Functor*> functors(mFunctors);
+    mFunctors.clear();
+
+    DrawGlInfo info;
+    info.clipLeft = 0;
+    info.clipTop = 0;
+    info.clipRight = 0;
+    info.clipBottom = 0;
+    info.isLayer = false;
+    memset(info.transform, 0, sizeof(float) * 16);
+
+    size_t count = functors.size();
+    for (size_t i = 0; i < count; i++) {
+        Functor* f = functors.itemAt(i);
+        result |= (*f)(DrawGlInfo::kModeProcess, &info);
+
+        if (result != DrawGlInfo::kStatusDone) {
+            Rect localDirty(info.dirtyLeft, info.dirtyTop, info.dirtyRight, info.dirtyBottom);
+            dirty.unionWith(localDirty);
+
+            if (result == DrawGlInfo::kStatusInvoke) {
+                mFunctors.push(f);
+            }
+        }
+    }
+
+    return result;
+}
+
+status_t OpenGLRenderer::callDrawGLFunction(Functor* functor, Rect& dirty) {
     interrupt();
     if (mDirtyClip) {
         setScissorFromClip();
@@ -261,11 +294,15 @@ status_t OpenGLRenderer::callDrawGLFunction(Functor *functor, Rect& dirty) {
     info.isLayer = hasLayer();
     getSnapshot()->transform->copyTo(&info.transform[0]);
 
-    status_t result = (*functor)(0, &info);
+    status_t result = (*functor)(DrawGlInfo::kModeDraw, &info);
 
-    if (result != 0) {
+    if (result != DrawGlInfo::kStatusDone) {
         Rect localDirty(info.dirtyLeft, info.dirtyTop, info.dirtyRight, info.dirtyBottom);
         dirty.unionWith(localDirty);
+
+        if (result == DrawGlInfo::kStatusInvoke) {
+            mFunctors.push(functor);
+        }
     }
 
     resume();
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index 3ba6202..b651904 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -72,7 +72,8 @@ public:
     virtual void interrupt();
     virtual void resume();
 
-    virtual status_t callDrawGLFunction(Functor *functor, Rect& dirty);
+    ANDROID_API status_t invokeFunctors(Rect& dirty);
+    virtual status_t callDrawGLFunction(Functor* functor, Rect& dirty);
 
     ANDROID_API int getSaveCount() const;
     virtual int save(int flags);
@@ -602,8 +603,10 @@ private:
     // Various caches
     Caches& mCaches;
 
-    // List of rectagnles to clear after saveLayer() is invoked
+    // List of rectangles to clear after saveLayer() is invoked
     Vector<Rect*> mLayers;
+    // List of functors to invoke after a frame is drawn
+    Vector<Functor*> mFunctors;
 
     // Indentity matrix
     const mat4 mIdentity;