/*
 * cl_retinex_handler.h - CL retinex handler.
 *
 *  Copyright (c) 2016 Intel Corporation
 *
 * 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.
 *
 * Author: wangfei <feix.w.wang@intel.com>
 *             Wind Yuan <feng.yuan@intel.com>
 */

#ifndef XCAM_CL_RETINEX_HANLDER_H
#define XCAM_CL_RETINEX_HANLDER_H

#include <xcam_std.h>
#include <base/xcam_3a_result.h>
#include <x3a_stats_pool.h>
#include <ocl/cl_image_scaler.h>
#include <ocl/cl_gauss_handler.h>

#define XCAM_RETINEX_MAX_SCALE 2
#define XCAM_RETINEX_SCALER_FACTOR 0.5

namespace XCam {

typedef struct {
    float           gain;
    float           threshold;
    float           log_min;
    float           log_max;
    float           width;
    float           height;
} CLRetinexConfig;

class CLRetinexImageHandler;

class CLRetinexScalerImageKernel
    : public CLScalerKernel
{
public:
    explicit CLRetinexScalerImageKernel (
        const SmartPtr<CLContext> &context,
        CLImageScalerMemoryLayout mem_layout,
        SmartPtr<CLRetinexImageHandler> &retinex);

protected:
    //derived from CLScalerKernel
    virtual SmartPtr<VideoBuffer> get_input_buffer ();
    virtual SmartPtr<VideoBuffer> get_output_buffer ();

private:
    SmartPtr<CLRetinexImageHandler> _retinex;

};

class CLRetinexGaussImageKernel
    : public CLGaussImageKernel
{
public:
    explicit CLRetinexGaussImageKernel (
        const SmartPtr<CLContext> &context,
        SmartPtr<CLRetinexImageHandler> &retinex,
        uint32_t index,
        uint32_t radius, float sigma);
    virtual SmartPtr<VideoBuffer> get_input_buf ();
    virtual SmartPtr<VideoBuffer> get_output_buf ();


private:
    SmartPtr<CLRetinexImageHandler> _retinex;
    uint32_t                        _index;

};

class CLRetinexImageKernel
    : public CLImageKernel
{
public:
    explicit CLRetinexImageKernel (const SmartPtr<CLContext> &context, SmartPtr<CLRetinexImageHandler> &retinex);

protected:
    virtual XCamReturn prepare_arguments (
        CLArgList &args, CLWorkSize &work_size);

private:
    SmartPtr<CLRetinexImageHandler>  _retinex;
};

class CLRetinexImageHandler
    : public CLImageHandler
{
public:
    explicit CLRetinexImageHandler (const SmartPtr<CLContext> &context, const char *name);
    bool set_retinex_kernel(SmartPtr<CLRetinexImageKernel> &kernel);
    bool set_retinex_scaler_kernel(SmartPtr<CLRetinexScalerImageKernel> &kernel);
    //bool set_retinex_gauss_kernel(SmartPtr<CLRetinexGaussImageKernel> &kernel);
    SmartPtr<VideoBuffer> &get_scaler_buf1 () {
        return _scaler_buf1;
    };
    SmartPtr<VideoBuffer> &get_gaussian_buf (uint index) {
        XCAM_ASSERT (index < XCAM_RETINEX_MAX_SCALE);
        return _gaussian_buf[index];
    };

    virtual void emit_stop ();

protected:
    virtual XCamReturn prepare_output_buf (SmartPtr<VideoBuffer> &input, SmartPtr<VideoBuffer> &output);

private:
    XCamReturn prepare_scaler_buf (const VideoBufferInfo &video_info);

private:
    SmartPtr<CLRetinexImageKernel>        _retinex_kernel;
    SmartPtr<CLRetinexScalerImageKernel>  _retinex_scaler_kernel;
    //SmartPtr<CLRetinexGaussImageKernel>   _retinex_gauss_kernel;

    double                                _scaler_factor;
    SmartPtr<BufferPool>                  _scaler_buf_pool;
    SmartPtr<VideoBuffer>                 _scaler_buf1;
    SmartPtr<VideoBuffer>                 _gaussian_buf[XCAM_RETINEX_MAX_SCALE];

};

SmartPtr<CLImageHandler>
create_cl_retinex_image_handler (const SmartPtr<CLContext> &context);

};

#endif //XCAM_CL_RETINEX_HANLDER_H