libcamera: PixelFormat: Mark all function arguments of type PixelFormat as const reference

PixelFormat was previously an alias for unsigned int but is now a
class. Make all functions taking PixelFormat do so as a const reference.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/include/v4l2_videodevice.h

@@ -204,8 +204,9 @@ public:
 					       const std::string &entity);
 
 	static PixelFormat toPixelFormat(uint32_t v4l2Fourcc);
-	uint32_t toV4L2Fourcc(PixelFormat pixelFormat);
-	static uint32_t toV4L2Fourcc(PixelFormat pixelFormat, bool multiplanar);
+	uint32_t toV4L2Fourcc(const PixelFormat &pixelFormat);
+	static uint32_t toV4L2Fourcc(const PixelFormat &pixelFormat,
+				     bool multiplanar);
 
 protected:
 	std::string logPrefix() const;

src/libcamera/stream.cpp

@@ -127,7 +127,7 @@ std::vector<PixelFormat> StreamFormats::pixelformats() const
  *
  * \return A list of frame sizes or an empty list on error
  */
-std::vector<Size> StreamFormats::sizes(PixelFormat pixelformat) const
+std::vector<Size> StreamFormats::sizes(const PixelFormat &pixelformat) const
 {
 	/*
 	 * Sizes to try and extract from ranges.
@@ -240,7 +240,7 @@ std::vector<Size> StreamFormats::sizes(PixelFormat pixelformat) const
  *
  * \return A range of valid image sizes or an empty range on error
  */
-SizeRange StreamFormats::range(PixelFormat pixelformat) const
+SizeRange StreamFormats::range(const PixelFormat &pixelformat) const
 {
 	auto const it = formats_.find(pixelformat);
 	if (it == formats_.end())

src/libcamera/v4l2_videodevice.cpp

@@ -1487,7 +1487,7 @@ PixelFormat V4L2VideoDevice::toPixelFormat(uint32_t v4l2Fourcc)
  *
  * \return The V4L2_PIX_FMT_* pixel format code corresponding to \a pixelFormat
  */
-uint32_t V4L2VideoDevice::toV4L2Fourcc(PixelFormat pixelFormat)
+uint32_t V4L2VideoDevice::toV4L2Fourcc(const PixelFormat &pixelFormat)
 {
 	return V4L2VideoDevice::toV4L2Fourcc(pixelFormat, caps_.isMultiplanar());
 }
@@ -1505,7 +1505,8 @@ uint32_t V4L2VideoDevice::toV4L2Fourcc(PixelFormat pixelFormat)
  *
  * \return The V4L2_PIX_FMT_* pixel format code corresponding to \a pixelFormat
  */
-uint32_t V4L2VideoDevice::toV4L2Fourcc(PixelFormat pixelFormat, bool multiplanar)
+uint32_t V4L2VideoDevice::toV4L2Fourcc(const PixelFormat &pixelFormat,
+				       bool multiplanar)
 {
 	switch (pixelFormat) {
 	/* RGB formats. */