Add support for scaling textures in AndroidVideoCapturer.

talk/app/webrtc/java/jni/native_handle_impl.cc

 /*
  * libjingle
  * Copyright 2015 Google Inc.
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  * modification, are permitted provided that the following conditions are met:
  *
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  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 10 matching lines @@
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 #include "talk/app/webrtc/java/jni/native_handle_impl.h"
 
 #include "webrtc/base/checks.h"
+#include "webrtc/base/bind.h"
+
+using rtc::scoped_refptr;
+using webrtc::NativeHandleBuffer;
 
 namespace webrtc_jni {
 
+namespace {
+void ScaledFrameNotInUse(scoped_refptr<NativeHandleBuffer> original) {}
+}  // anonymous namespace
+
 NativeHandleImpl::NativeHandleImpl(JNIEnv* jni,
                                    jint j_oes_texture_id,
                                    jfloatArray j_transform_matrix)
     : oes_texture_id(j_oes_texture_id) {
   RTC_CHECK_EQ(16, jni->GetArrayLength(j_transform_matrix));
   jfloat* transform_matrix_ptr =
       jni->GetFloatArrayElements(j_transform_matrix, nullptr);
   for (int i = 0; i < 16; ++i) {
     sampling_matrix[i] = transform_matrix_ptr[i];
   }
@@ skipping 13 matching lines @@
   no_longer_used_cb_();
 }
 
 rtc::scoped_refptr<webrtc::VideoFrameBuffer>
 AndroidTextureBuffer::NativeToI420Buffer() {
   RTC_NOTREACHED()
       << "AndroidTextureBuffer::NativeToI420Buffer not implemented.";
   return nullptr;
 }
 
+rtc::scoped_refptr<AndroidTextureBuffer> AndroidTextureBuffer::CropAndScale(
+    int cropped_input_width,
+    int cropped_input_height,
+    int dst_widht,
+    int dst_height) {
+  // TODO(perkj) Implement cropping.

[magjed_webrtc, 2015/11/26 10:08:33]

Add a CHECK_EQ(cropped_input_width, width()) and CHECK_EQ(cropped_input_height,
height()) below the TODO to make sure this does not happen.

[perkj_webrtc, 2015/11/26 10:56:14]

Done.

+  // Here we use Bind magic to add a reference count to |this| until the newly
+  // created AndroidTextureBuffer is destructed. ScaledFrameNotInUse will be
+  // called that happens and when it finishes, the reference count to |this|
+  // will be decreased by one.
+  return new rtc::RefCountedObject<AndroidTextureBuffer>(
+      dst_widht, dst_height, native_handle_,
+      rtc::Bind(&ScaledFrameNotInUse, this));
+}
+
 }  // namespace webrtc_jni