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LibGfx: Make Matrix and VectorN more constexpr-friendly

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This allows the copy constructor of Matrix to be called constexpr,
which should allow more values to be compile-time calculated.

Likewise, VectorN.data() is now constexpr so that it can be compile-time
evaluated.
This commit is contained in:
Zaggy1024 2022-09-30 17:38:24 -05:00 committed by Andreas Kling
parent 0994e6964b
commit ba79de0439
2 changed files with 15 additions and 5 deletions
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16
Userland/Libraries/LibGfx/Matrix.h
View file

@ -36,13 +36,23 @@ public:
{
}
Matrix(Matrix const& other)
constexpr Matrix(Matrix const& other)
{
__builtin_memcpy(m_elements, other.elements(), sizeof(T) * N * N);
*this = other;
}
Matrix& operator=(Matrix const& other)
constexpr Matrix& operator=(Matrix const& other)
{
#ifndef __clang__
if (is_constant_evaluated()) {
for (size_t i = 0; i < N; i++) {
for (size_t j = 0; j < N; j++) {
m_elements[i][j] = other.elements()[i][j];
}
}
return *this;
}
#endif
__builtin_memcpy(m_elements, other.elements(), sizeof(T) * N * N);
return *this;
}

4
Userland/Libraries/LibGfx/VectorN.h
View file

@ -251,8 +251,8 @@ public:
return result;
}
auto& data() { return m_data; }
auto const& data() const { return m_data; }
constexpr auto& data() { return m_data; }
constexpr auto const& data() const { return m_data; }
private:
AK::Array<T, N> m_data;