Introduce facade for interaction with Android SurfaceTexture.

Cleans up some of the JNI and makes usage of Android APIs more explicit.
BUG=261717
TBR=apatrick
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/22912020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@219061 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 66 insertions, 8 deletions

diff --git a/ui/android/java/src/org/chromium/ui/gfx/SurfaceTextureBridge.java b/ui/android/java/src/org/chromium/ui/gfx/SurfaceTextureBridge.java
new file mode 100644
index 0000000..2333a01
--- /dev/null
+++ b/ui/android/java/src/org/chromium/ui/gfx/SurfaceTextureBridge.java
@@ -0,0 +1,64 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.ui.gfx;
+
+import android.graphics.SurfaceTexture;
+import android.os.Build;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+
+/**
+ * Wrapper class for the underlying platform's SurfaceTexture in order to
+ * provide a stable JNI API.
+ */
+@JNINamespace("gfx")
+class SurfaceTextureBridge {
+    @CalledByNative
+    private static SurfaceTexture create(int textureId) {
+        return new SurfaceTexture(textureId);
+    }
+
+    @CalledByNative
+    private static void destroy(SurfaceTexture surfaceTexture) {
+        surfaceTexture.setOnFrameAvailableListener(null);
+        surfaceTexture.release();
+    }
+
+    @CalledByNative
+    private static void setFrameAvailableCallback(SurfaceTexture surfaceTexture,
+            int nativeSurfaceTextureListener) {
+       surfaceTexture.setOnFrameAvailableListener(
+               new SurfaceTextureListener(nativeSurfaceTextureListener));
+    }
+
+    @CalledByNative
+    private static void updateTexImage(SurfaceTexture surfaceTexture) {
+        surfaceTexture.updateTexImage();
+    }
+
+    @CalledByNative
+    private static void setDefaultBufferSize(SurfaceTexture surfaceTexture, int width,
+            int height) {
+        surfaceTexture.setDefaultBufferSize(width, height);
+    }
+
+    @CalledByNative
+    private static void getTransformMatrix(SurfaceTexture surfaceTexture, float[] matrix) {
+        surfaceTexture.getTransformMatrix(matrix);
+    }
+
+    @CalledByNative
+    private static void attachToGLContext(SurfaceTexture surfaceTexture, int texName) {
+        assert Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN;
+        surfaceTexture.attachToGLContext(texName);
+    }
+
+    @CalledByNative
+    private static void detachFromGLContext(SurfaceTexture surfaceTexture) {
+        assert Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN;
+        surfaceTexture.detachFromGLContext();
+    }
+}
\ No newline at end of file
diff --git a/ui/android/java/src/org/chromium/ui/gfx/SurfaceTextureListener.java b/ui/android/java/src/org/chromium/ui/gfx/SurfaceTextureListener.java
index 8efe6dd..1b77370 100644
--- a/ui/android/java/src/org/chromium/ui/gfx/SurfaceTextureListener.java
+++ b/ui/android/java/src/org/chromium/ui/gfx/SurfaceTextureListener.java
@@ -6,7 +6,6 @@ package org.chromium.ui.gfx;
 
 import android.graphics.SurfaceTexture;
 
-import org.chromium.base.CalledByNative;
 import org.chromium.base.JNINamespace;
 
 /**
@@ -15,9 +14,9 @@ import org.chromium.base.JNINamespace;
 @JNINamespace("gfx")
 class SurfaceTextureListener implements SurfaceTexture.OnFrameAvailableListener {
     // Used to determine the class instance to dispatch the native call to.
-    private int mNativeSurfaceTextureListener = 0;
+    private final int mNativeSurfaceTextureListener;
 
-    private SurfaceTextureListener(int nativeSurfaceTextureListener) {
+    SurfaceTextureListener(int nativeSurfaceTextureListener) {
         assert nativeSurfaceTextureListener != 0;
         mNativeSurfaceTextureListener = nativeSurfaceTextureListener;
     }
@@ -36,11 +35,6 @@ class SurfaceTextureListener implements SurfaceTexture.OnFrameAvailableListener
         }
     }
 
-    @CalledByNative
-    private static SurfaceTextureListener create(int nativeSurfaceTextureListener) {
-        return new SurfaceTextureListener(nativeSurfaceTextureListener);
-    }
-
     private native void nativeFrameAvailable(int nativeSurfaceTextureListener);
     private native void nativeDestroy(int nativeSurfaceTextureListener);
 }