From 5a33bc10e9d3bc3a7cb1ead66c7ec0a413083d91 Mon Sep 17 00:00:00 2001
From: Milan Zamazal <mzamazal@redhat.com>
Date: Fri, 21 Nov 2025 17:30:16 +0100
Subject: [PATCH] libcamera: software_isp: Assign colour spaces in
 configurations

StreamConfiguration's should have colorSpace set.  This is not the case
in the simple pipeline.  Let's set it there.  This also fixes a crash in
`cam' due to accessing an unset colorSpace.

We set the colour spaces according to the pixel format.  This is not
completely correct because pixel formats and colour spaces are
different, although not completely independent, things.  But for the
lack of a better practical option to determine the colour space, we use
this.

Closes: https://gitlab.freedesktop.org/camera/libcamera/-/issues/294
Reviewed-by: Isaac Scott <isaac.scott@ideasonboard.com>
Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 src/libcamera/pipeline/simple/simple.cpp | 40 ++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
index 118b4186..c0d938cf 100644
--- a/src/libcamera/pipeline/simple/simple.cpp
+++ b/src/libcamera/pipeline/simple/simple.cpp
@@ -25,6 +25,7 @@
 #include <libcamera/base/log.h>
 
 #include <libcamera/camera.h>
+#include <libcamera/color_space.h>
 #include <libcamera/control_ids.h>
 #include <libcamera/request.h>
 #include <libcamera/stream.h>
@@ -36,6 +37,7 @@
 #include "libcamera/internal/converter.h"
 #include "libcamera/internal/delayed_controls.h"
 #include "libcamera/internal/device_enumerator.h"
+#include "libcamera/internal/formats.h"
 #include "libcamera/internal/global_configuration.h"
 #include "libcamera/internal/media_device.h"
 #include "libcamera/internal/pipeline_handler.h"
@@ -1227,6 +1229,44 @@ CameraConfiguration::Status SimpleCameraConfiguration::validate()
 			status = Adjusted;
 		}
 
+		/*
+		 * Best effort to fix the color space. If the color space is not set,
+		 * set it according to the pixel format, which may not be correct (pixel
+		 * formats and color spaces are different things, although somewhat
+		 * related) but we don't have a better option at the moment. Then in any
+		 * case, perform the standard pixel format based color space adjustment.
+		 */
+		if (!cfg.colorSpace) {
+			const PixelFormatInfo &info = PixelFormatInfo::info(pixelFormat);
+			switch (info.colourEncoding) {
+			case PixelFormatInfo::ColourEncodingRGB:
+				cfg.colorSpace = ColorSpace::Srgb;
+				break;
+			case PixelFormatInfo::ColourEncodingYUV:
+				cfg.colorSpace = ColorSpace::Sycc;
+				break;
+			default:
+				cfg.colorSpace = ColorSpace::Raw;
+			}
+			LOG(SimplePipeline, Debug)
+				<< "Unspecified color space set to "
+				<< cfg.colorSpace.value().toString();
+			/*
+			 * Adjust the assigned color space to make sure everything is OK.
+			 * Since this is assigning an unspecified color space rather than
+			 * adjusting a requested one, changes here shouldn't set the status
+			 * to Adjusted.
+			 */
+			cfg.colorSpace->adjust(pixelFormat);
+		} else {
+			if (cfg.colorSpace->adjust(pixelFormat)) {
+				LOG(SimplePipeline, Debug)
+					<< "Color space adjusted to "
+					<< cfg.colorSpace.value().toString();
+				status = Adjusted;
+			}
+		}
+
 		if (!pipeConfig_->outputSizes.contains(cfg.size)) {
 			Size adjustedSize = pipeConfig_->captureSize;
 			/*