#include "megdnn/oprs.h"

#include "src/common/utils.h"

namespace megdnn {

void ROICopyBase::deduce_layout_fwd(const TensorLayout& src, TensorLayout& dst) {
    size_t in = src.shape[0];
    size_t ih = src.shape[1];
    size_t iw = src.shape[2];
    size_t ic = src.shape[3];

    megdnn_assert(param().row_to <= ih && param().row_to > param().row_from);
    megdnn_assert(param().col_to <= iw && param().col_to > param().col_from);
    megdnn_assert(ic == 1_z || ic == 3_z);
    size_t oh = param().row_to - param().row_from;
    size_t ow = param().col_to - param().col_from;

    dst = TensorLayout(TensorShape({in, oh, ow, ic}), src.dtype);
}

void ROICopyBase::check_layout_fwd(const TensorLayout& src, const TensorLayout& dst) {
    TensorLayout dst_expected;
    megdnn_assert_eq_dtype(src, dst);
    deduce_layout_fwd(src, dst_expected);
    megdnn_assert_eq_shape(dst_expected, dst);
}

void ROICopy::deduce_layout(const TensorLayout& src, TensorLayout& dst) {
    deduce_layout_fwd(src, dst);
}

void ROICopy::check_exec(
        const TensorLayout& src, const TensorLayout& dst, size_t workspace_in_bytes) {
    check_layout_fwd(src, dst);
    auto required_workspace_in_bytes = get_workspace_in_bytes(src, dst);
    megdnn_assert(workspace_in_bytes >= required_workspace_in_bytes);
}

}  // namespace megdnn

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