upstream SurfaceTextureListener and SurfaceTextureBridge class for android

content/common/android/surface_texture_bridge.cc

+// Copyright (c) 2011 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.
+
+#include "content/common/android/surface_texture_bridge.h"
+
+#include "base/android/jni_android.h"
+#include "base/logging.h"
+#include "content/common/android/surface_texture_listener.h"
+
+using base::android::AttachCurrentThread;
+using base::android::CheckException;
+using base::android::GetClass;
+using base::android::GetMethodID;
+using base::android::ScopedJavaLocalRef;
+
+namespace content {
+
+SurfaceTextureBridge::SurfaceTextureBridge(int texture_id)
+    : texture_id_(texture_id) {
+  JNIEnv* env = AttachCurrentThread();
+  CHECK(env);
+
+  j_class_.Reset(GetClass(env, "android/graphics/SurfaceTexture"));
+  jmethodID constructor = GetMethodID(env, j_class_, "<init>", "(I)V");
+  ScopedJavaLocalRef<jobject> tmp(env,
+      env->NewObject(j_class_.obj(), constructor, texture_id));
+  DCHECK(!tmp.is_null());
+  j_surface_texture_.Reset(tmp);
+}
+
+SurfaceTextureBridge::~SurfaceTextureBridge() {
+  JNIEnv* env = AttachCurrentThread();
+  CHECK(env);
+
+  // Release the listener.
+  const char* method_signature =
+      "(Landroid/graphics/SurfaceTexture$OnFrameAvailableListener;)V";
+  jmethodID method = GetMethodID(env, j_class_, "setOnFrameAvailableListener",
+                                 method_signature);
+  env->CallVoidMethod(j_surface_texture_.obj(), method, NULL);
+  CheckException(env);
+
+  // Release graphics memory.
+  jmethodID release = GetMethodID(env, j_class_, "release", "()V");
+  env->CallVoidMethod(j_surface_texture_.obj(), release);
+  CheckException(env);
+}
+
+void SurfaceTextureBridge::SetFrameAvailableCallback(
+    const base::Closure& callback) {
+  JNIEnv* env = AttachCurrentThread();
+  CHECK(env);
+
+  // Since the listener is owned by the Java SurfaceTexture object, setting
+  // a new listener here will release an existing one at the same time.
+  ScopedJavaLocalRef<jobject> j_listener(env,
+      SurfaceTextureListener::CreateSurfaceTextureListener(env, callback));
+  DCHECK(!j_listener.is_null());
+
+  // Set it as the onFrameAvailableListener for our SurfaceTexture instance.
+  const char* method_signature =
+      "(Landroid/graphics/SurfaceTexture$OnFrameAvailableListener;)V";
+  jmethodID method = GetMethodID(env, j_class_, "setOnFrameAvailableListener",
+                                 method_signature);
+  env->CallVoidMethod(j_surface_texture_.obj(), method, j_listener.obj());
+  CheckException(env);
+}
+
+void SurfaceTextureBridge::UpdateTexImage() {
+  JNIEnv* env = AttachCurrentThread();
+  CHECK(env);
+
+  jmethodID method = GetMethodID(env, j_class_, "updateTexImage", "()V");
+  env->CallVoidMethod(j_surface_texture_.obj(), method);
+  CheckException(env);
+}
+
+void SurfaceTextureBridge::GetTransformMatrix(float mtx[16]) {
+  JNIEnv* env = AttachCurrentThread();
+  CHECK(env);
+
+  ScopedJavaLocalRef<jfloatArray> jmatrix(env, env->NewFloatArray(16));
+  jmethodID method = GetMethodID(env, j_class_, "getTransformMatrix", "([F)V");
+  env->CallVoidMethod(j_surface_texture_.obj(), method, jmatrix.obj());
+  CheckException(env);
+
+  jboolean is_copy;
+  jfloat* elements = env->GetFloatArrayElements(jmatrix.obj(), &is_copy);
+  for (int i = 0; i < 16; ++i) {
+    mtx[i] = static_cast<float>(elements[i]);
+  }
+  env->ReleaseFloatArrayElements(jmatrix.obj(), elements, JNI_ABORT);
+}
+
+void SurfaceTextureBridge::SetDefaultBufferSize(int width, int height) {
+  JNIEnv* env = AttachCurrentThread();
+  CHECK(env);
+
+  jmethodID method = GetMethodID(env, j_class_,
+                                 "setDefaultBufferSize", "(II)V");
+  env->CallVoidMethod(j_surface_texture_.obj(), method,
+                      static_cast<jint>(width), static_cast<jint>(height));
+  CheckException(env);
+}
+
+}  // namespace content