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libcamera: vector: Extend matrix multiplication operator to heterogenous types

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It is useful to multiply matrices and vectors of heterogeneous types, for
instance float and double. Extend the multiplication operator to support
this, avoiding the need to convert one of the operations. The type of the
returned vector is selected automatically to avoid loosing precision.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2025-04-03 17:49:13 +02:00 • committed by Stefan Klug
parent 754798b664
commit 1e67b96fb0
2 changed files with 8 additions and 6 deletions
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9
include/libcamera/internal/vector.h
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@ -13,6 +13,7 @@
#include <numeric>
#include <optional>
#include <ostream>
#include <type_traits>
#include <libcamera/base/log.h>
#include <libcamera/base/span.h>
@ -295,13 +296,13 @@ private:
template<typename T>
using RGB = Vector<T, 3>;
template<typename T, unsigned int Rows, unsigned int Cols>
Vector<T, Rows> operator*(const Matrix<T, Rows, Cols> &m, const Vector<T, Cols> &v)
template<typename T, typename U, unsigned int Rows, unsigned int Cols>
Vector<std::common_type_t<T, U>, Rows> operator*(const Matrix<T, Rows, Cols> &m, const Vector<U, Cols> &v)
{
Vector<T, Rows> result;
Vector<std::common_type_t<T, U>, Rows> result;
for (unsigned int i = 0; i < Rows; i++) {
T sum = 0;
std::common_type_t<T, U> sum = 0;
for (unsigned int j = 0; j < Cols; j++)
sum += m[i][j] * v[j];
result[i] = sum;