apps: Define local functions in anonymous namespace

Multiple local functions are defined in the global namespace without the
static keyword. This compiles fine for now, but will cause a missing
declaration warning when we enable them. To prepare for that, move the
function declaration to an anonymous namespace.

While at it, for consistency, include an existing static function in the
namespace and drop the static keyword.

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

src/apps/common/dng_writer.cpp

@@ -126,6 +126,8 @@ struct Matrix3d {
 	float m[9];
 };
 
+namespace {
+
 void packScanlineSBGGR8(void *output, const void *input, unsigned int width)
 {
 	const uint8_t *in = static_cast<const uint8_t *>(input);
@@ -282,7 +284,7 @@ void thumbScanlineIPU3([[maybe_unused]] const FormatInfo &info, void *output,
 	}
 }
 
-static const std::map<PixelFormat, FormatInfo> formatInfo = {
+const std::map<PixelFormat, FormatInfo> formatInfo = {
 	{ formats::SBGGR8, {
 		.bitsPerSample = 8,
 		.pattern = { CFAPatternBlue, CFAPatternGreen, CFAPatternGreen, CFAPatternRed },
@@ -381,6 +383,8 @@ static const std::map<PixelFormat, FormatInfo> formatInfo = {
 	} },
 };
 
+} /* namespace */
+
 int DNGWriter::write(const char *filename, const Camera *camera,
 		     const StreamConfiguration &config,
 		     const ControlList &metadata,