shape_mask.cpp

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#include "porytiles/domain/models/shape_mask.hpp"
 
#include <algorithm>
#include <cstdint>
 
#include "porytiles/utilities/reverse_bits.hpp"
 
namespace porytiles {
 
ShapeMask ShapeMask::flip(bool h, bool v) const
{
    if (!h && !v) {
        return *this;
    }
 
    ShapeMask result;
    const int8_t v_inc = v ? -1 : 1;
    const int8_t v_start = v ? 7 : 0;
 
    for (int y = 0; y < 8; ++y) {
        const int ry = y * v_inc + v_start;
        result.rows_[y] = h ? reverse_bits(rows_[ry]) : rows_[ry];
    }
    return result;
}
 
void ShapeMask::set(std::size_t row, std::size_t col)
{
    rows_[row] |= (1 << (7 - col));
}
 
void ShapeMask::unset(std::size_t row, std::size_t col)
{
    rows_[row] &= ~(1 << (7 - col));
}
 
bool ShapeMask::get(std::size_t row, std::size_t col) const
{
    return (rows_[row] & (1 << (7 - col))) != 0;
}
 
bool ShapeMask::is_transparent() const
{
    return std::ranges::all_of(rows_, [](uint8_t byte) { return byte == 0; });
}
 
} // namespace porytiles