libcamera: formats: PixelFormatInfo: Add name lookup function

Add a function which returns PixelFormatInfo, given format name as
a string.

Signed-off-by: Kaaira Gupta <kgupta@es.iitr.ac.in>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/internal/formats.h

@@ -38,6 +38,7 @@ public:
 
 	static const PixelFormatInfo &info(const PixelFormat &format);
 	static const PixelFormatInfo &info(const V4L2PixelFormat &format);
+	static const PixelFormatInfo &info(const std::string &name);
 
 	unsigned int stride(unsigned int width, unsigned int plane,
 			    unsigned int align = 1) const;

src/libcamera/formats.cpp

@@ -703,6 +703,22 @@ const PixelFormatInfo &PixelFormatInfo::info(const V4L2PixelFormat &format)
 	return info->second;
 }
 
+/**
+ * \brief Retrieve information about a pixel format
+ * \param[in] name The name of pixel format
+ * \return The PixelFormatInfo describing the PixelFormat matching the
+ * \a name if known, or an invalid PixelFormatInfo otherwise
+ */
+const PixelFormatInfo &PixelFormatInfo::info(const std::string &name)
+{
+	for (const auto &info : pixelFormatInfo) {
+		if (info.second.name == name)
+			return info.second;
+	}
+
+	return pixelFormatInfoInvalid;
+}
+
 /**
  * \brief Compute the stride
  * \param[in] width The width of the line, in pixels