2 files changed, 26 insertions, 3 deletions
diff --git a/core/java/android/view/Surface.java b/core/java/android/view/Surface.java
index da684e8..828e082 100644
--- a/core/java/android/view/Surface.java
+++ b/core/java/android/view/Surface.java
@@ -53,6 +53,9 @@ public class Surface implements Parcelable {
 
     private static native void nativeAllocateBuffers(long nativeObject);
 
+    private static native int nativeGetWidth(long nativeObject);
+    private static native int nativeGetHeight(long nativeObject);
+
     public static final Parcelable.Creator<Surface> CREATOR =
             new Parcelable.Creator<Surface>() {
         @Override
@@ -324,7 +327,9 @@ public class Surface implements Parcelable {
             if (mHwuiContext == null) {
                 mHwuiContext = new HwuiContext();
             }
-            return mHwuiContext.lockCanvas();
+            return mHwuiContext.lockCanvas(
+                    nativeGetWidth(mNativeObject),
+                    nativeGetHeight(mNativeObject));
         }
     }
 
@@ -573,11 +578,11 @@ public class Surface implements Parcelable {
             mHwuiRenderer = nHwuiCreate(mRenderNode.mNativeRenderNode, mNativeObject);
         }
 
-        Canvas lockCanvas() {
+        Canvas lockCanvas(int width, int height) {
             if (mCanvas != null) {
                 throw new IllegalStateException("Surface was already locked!");
             }
-            mCanvas = mRenderNode.start(0, 0);
+            mCanvas = mRenderNode.start(width, height);
             return mCanvas;
         }
 
diff --git a/core/jni/android_view_Surface.cpp b/core/jni/android_view_Surface.cpp
index b3d9890..871426e 100644
--- a/core/jni/android_view_Surface.cpp
+++ b/core/jni/android_view_Surface.cpp
@@ -357,6 +357,22 @@ static void nativeWriteToParcel(JNIEnv* env, jclass clazz,
     parcel->writeStrongBinder( self != 0 ? self->getIGraphicBufferProducer()->asBinder() : NULL);
 }
 
+static jint nativeGetWidth(JNIEnv* env, jclass clazz, jlong nativeObject) {
+    Surface* surface = reinterpret_cast<Surface*>(nativeObject);
+    ANativeWindow* anw = static_cast<ANativeWindow*>(surface);
+    int value = 0;
+    anw->query(anw, NATIVE_WINDOW_WIDTH, &value);
+    return value;
+}
+
+static jint nativeGetHeight(JNIEnv* env, jclass clazz, jlong nativeObject) {
+    Surface* surface = reinterpret_cast<Surface*>(nativeObject);
+    ANativeWindow* anw = static_cast<ANativeWindow*>(surface);
+    int value = 0;
+    anw->query(anw, NATIVE_WINDOW_HEIGHT, &value);
+    return value;
+}
+
 namespace uirenderer {
 
 using namespace android::uirenderer::renderthread;
@@ -425,6 +441,8 @@ static JNINativeMethod gSurfaceMethods[] = {
             (void*)nativeReadFromParcel },
     {"nativeWriteToParcel", "(JLandroid/os/Parcel;)V",
             (void*)nativeWriteToParcel },
+    {"nativeGetWidth", "(J)I", (void*)nativeGetWidth },
+    {"nativeGetHeight", "(J)I", (void*)nativeGetHeight },
 
     // HWUI context
     {"nHwuiCreate", "(JJ)J", (void*) hwui::create },