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 /*
  * Copyright (c) 2025 Advanced Micro Devices, Inc. All rights reserved.
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
  
 #pragma once
  
 #include <hip/hip_runtime.h>
  
 #include "core/detail/casting.hpp"
  
 namespace Kernels {
 namespace Device {
 template <typename SrcWrapper, typename MaskWrapper, typename DstWrapper>
 __global__ void composite(SrcWrapper foreground, SrcWrapper background, MaskWrapper mask, DstWrapper output) {
     using namespace roccv::detail;  // For RangeCast, NumElements, etc.
     using src_type = typename SrcWrapper::ValueType;
     using dst_type = typename DstWrapper::ValueType;
     using work_type = MakeType<float, NumElements<src_type>>;
  
     const int x = blockIdx.x * blockDim.x + threadIdx.x;
     const int y = blockIdx.y * blockDim.y + threadIdx.y;
     const int batch = blockIdx.z;
  
     if (x >= foreground.width() || y >= foreground.height()) return;
  
     // Range cast all input values to float to avoid overflowing values and keep them in the same range.
     auto maskFactor = RangeCast<float1>(mask.at(batch, y, x, 0));
     auto fgVal = RangeCast<work_type>(foreground.at(batch, y, x, 0));
     auto bgVal = RangeCast<work_type>(background.at(batch, y, x, 0));
  
     work_type result = bgVal + maskFactor.x * (fgVal - bgVal);
  
     // If number of channels in output is 4, ensure that the last channel (alpha in this case) is always fully on.
     if constexpr (NumElements<dst_type> == 4) {
         output.at(batch, y, x, 0) = RangeCast<dst_type>((MakeType<float, 4>){result.x, result.y, result.z, 1.0f});
     } else {
         output.at(batch, y, x, 0) = RangeCast<dst_type>(result);
     }
 }
 }  // namespace Device
 }  // namespace Kernels