libcamera: base: log: Add coloring to the log output

Extend the logger to support coloring messages. The log level is
colorized with per-level colors, and the category with a fixed color.
This makes the log output more readable.

Coloring is enabled by default when logging to std::cerr, and can be
disabled by setting the LIBCAMERA_LOG_NO_COLOR environment variable.
When logging to a file with LIBCAMERA_LOG_FILE, coloring is disabled. It
can be enabled for file logging using the logSetFile() function.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/include/libcamera/logging.h b/include/libcamera/logging.h
index c36882b9..cd842f67 100644
--- a/include/libcamera/logging.h
+++ b/include/libcamera/logging.h
@@ -16,8 +16,8 @@ enum LoggingTarget {
 	LoggingTargetStream,
 };
 
-int logSetFile(const char *path);
-int logSetStream(std::ostream *stream);
+int logSetFile(const char *path, bool color = false);
+int logSetStream(std::ostream *stream, bool color = false);
 int logSetTarget(LoggingTarget target);
 void logSetLevel(const char *category, const char *level);