/* Copyright 2015 The TensorFlow Authors.  All Rights Reserved. 

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License. 
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
See the License for the specific language governing permissions and
limitations under the License. 
==============================================================================*/

// This file binds the native image utility code to the Java class
// which exposes them. 

#include <jni.h>
#include <stdio.h>
#include <stdlib.h>

#include "tensorflow/core/platform/types.h"
#include "tensorflow/examples/android/jni/rgb2yuv.h"
#include "tensorflow/examples/android/jni/yuv2rgb.h"

#define IMAGEUTILS_METHOD(METHOD_NAME) \
  Java_org_tensorflow_demo_env_ImageUtils_##METHOD_NAME  // NOLINT

using namespace tensorflow;

#ifdef __cplusplus
extern "C" {
#endif

JNIEXPORT void JNICALL
IMAGEUTILS_METHOD(convertYUV420SPToARGB8888)(
    JNIEnv* env, jclass clazz, jbyteArray input, jintArray output,
    jint width, jint height, jboolean halfSize);

JNIEXPORT void JNICALL IMAGEUTILS_METHOD(convertYUV420ToARGB8888)(
    JNIEnv* env, jclass clazz, jbyteArray y, jbyteArray u, jbyteArray v,
    jintArray output, jint width, jint height, jint y_row_stride,
    jint uv_row_stride, jint uv_pixel_stride, jboolean halfSize);

JNIEXPORT void JNICALL IMAGEUTILS_METHOD(convertYUV420SPToRGB565)(
    JNIEnv* env, jclass clazz, jbyteArray input, jbyteArray output, jint width,
    jint height);

JNIEXPORT void JNICALL
IMAGEUTILS_METHOD(convertARGB8888ToYUV420SP)(
    JNIEnv* env, jclass clazz, jintArray input, jbyteArray output,
    jint width, jint height);

JNIEXPORT void JNICALL
IMAGEUTILS_METHOD(convertRGB565ToYUV420SP)(
    JNIEnv* env, jclass clazz, jbyteArray input, jbyteArray output,
    jint width, jint height);

#ifdef __cplusplus
}
#endif

JNIEXPORT void JNICALL
IMAGEUTILS_METHOD(convertYUV420SPToARGB8888)(
    JNIEnv* env, jclass clazz, jbyteArray input, jintArray output,
    jint width, jint height, jboolean halfSize) {
  jboolean inputCopy = JNI_FALSE;
  jbyte* const i = env->GetByteArrayElements(input, &inputCopy);

  jboolean outputCopy = JNI_FALSE;
  jint* const o = env->GetIntArrayElements(output, &outputCopy);

  if (halfSize) {
    ConvertYUV420SPToARGB8888HalfSize(reinterpret_cast<uint8*>(i),
                                      reinterpret_cast<uint32*>(o),
                                      width, height);
  } else {
    ConvertYUV420SPToARGB8888(reinterpret_cast<uint8*>(i),
                              reinterpret_cast<uint8*>(i) + width * height,
                              reinterpret_cast<uint32*>(o),
                              width, height);
  }

  env->ReleaseByteArrayElements(input, i, JNI_ABORT);
  env->ReleaseIntArrayElements(output, o, 0);
}

JNIEXPORT void JNICALL IMAGEUTILS_METHOD(convertYUV420ToARGB8888)(
    JNIEnv* env, jclass clazz, jbyteArray y, jbyteArray u, jbyteArray v,
    jintArray output, jint width, jint height, jint y_row_stride,
    jint uv_row_stride, jint uv_pixel_stride, jboolean halfSize) {
  jboolean inputCopy = JNI_FALSE;
  jbyte* const y_buff = env->GetByteArrayElements(y, &inputCopy);
  jboolean outputCopy = JNI_FALSE;
  jint* const o = env->GetIntArrayElements(output, &outputCopy);

  if (halfSize) {
    ConvertYUV420SPToARGB8888HalfSize(reinterpret_cast<uint8*>(y_buff),
                                      reinterpret_cast<uint32*>(o), width,
                                      height);
  } else {
    jbyte* const u_buff = env->GetByteArrayElements(u, &inputCopy);
    jbyte* const v_buff = env->GetByteArrayElements(v, &inputCopy);

    ConvertYUV420ToARGB8888(
        reinterpret_cast<uint8*>(y_buff), reinterpret_cast<uint8*>(u_buff),
        reinterpret_cast<uint8*>(v_buff), reinterpret_cast<uint32*>(o), width,
        height, y_row_stride, uv_row_stride, uv_pixel_stride);

    env->ReleaseByteArrayElements(u, u_buff, JNI_ABORT);
    env->ReleaseByteArrayElements(v, v_buff, JNI_ABORT);
  }

  env->ReleaseByteArrayElements(y, y_buff, JNI_ABORT);
  env->ReleaseIntArrayElements(output, o, 0);
}

JNIEXPORT void JNICALL IMAGEUTILS_METHOD(convertYUV420SPToRGB565)(
    JNIEnv* env, jclass clazz, jbyteArray input, jbyteArray output, jint width,
    jint height) {
  jboolean inputCopy = JNI_FALSE;
  jbyte* const i = env->GetByteArrayElements(input, &inputCopy);

  jboolean outputCopy = JNI_FALSE;
  jbyte* const o = env->GetByteArrayElements(output, &outputCopy);

  ConvertYUV420SPToRGB565(reinterpret_cast<uint8*>(i),
                          reinterpret_cast<uint16*>(o),
                          width, height);

  env->ReleaseByteArrayElements(input, i, JNI_ABORT);
  env->ReleaseByteArrayElements(output, o, 0);
}

JNIEXPORT void JNICALL
IMAGEUTILS_METHOD(convertARGB8888ToYUV420SP)(
    JNIEnv* env, jclass clazz, jintArray input, jbyteArray output,
    jint width, jint height) {
  jboolean inputCopy = JNI_FALSE;
  jint* const i = env->GetIntArrayElements(input, &inputCopy);

  jboolean outputCopy = JNI_FALSE;
  jbyte* const o = env->GetByteArrayElements(output, &outputCopy);

  ConvertARGB8888ToYUV420SP(reinterpret_cast<uint32*>(i),
                            reinterpret_cast<uint8*>(o),
                            width, height);

  env->ReleaseIntArrayElements(input, i, JNI_ABORT);
  env->ReleaseByteArrayElements(output, o, 0);
}

JNIEXPORT void JNICALL
IMAGEUTILS_METHOD(convertRGB565ToYUV420SP)(
    JNIEnv* env, jclass clazz, jbyteArray input, jbyteArray output,
    jint width, jint height) {
  jboolean inputCopy = JNI_FALSE;
  jbyte* const i = env->GetByteArrayElements(input, &inputCopy);

  jboolean outputCopy = JNI_FALSE;
  jbyte* const o = env->GetByteArrayElements(output, &outputCopy);

  ConvertRGB565ToYUV420SP(reinterpret_cast<uint16*>(i),
                          reinterpret_cast<uint8*>(o),
                          width, height);

  env->ReleaseByteArrayElements(input, i, JNI_ABORT);
  env->ReleaseByteArrayElements(output, o, 0);
}
