libipa: Centralise Fixed / Floating point convertors

The rkisp1 IPA has some utility functions to convert between fixed
and floating point numbers. Move those to libipa so they're available
for use in other IPA modules too.

Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/ipa/rkisp1/algorithms/ccm.cpp

@@ -18,7 +18,7 @@
 
 #include "libcamera/internal/yaml_parser.h"
 
-#include "../utils.h"
+#include "libipa/fixedpoint.h"
 #include "libipa/interpolator.h"
 
 /**
@@ -72,7 +72,7 @@ void Ccm::setParameters(struct rkisp1_cif_isp_ctk_config &config,
 	for (unsigned int i = 0; i < 3; i++) {
 		for (unsigned int j = 0; j < 3; j++)
 			config.coeff[i][j] =
-				utils::floatingToFixedPoint<4, 7, uint16_t, double>(matrix[i][j]);
+				floatingToFixedPoint<4, 7, uint16_t, double>(matrix[i][j]);
 	}
 
 	for (unsigned int i = 0; i < 3; i++)