tests: stream: Add a colorspace adjustment test

ColorSpace can be adjusted based on the stream's pixelFormat being
requested. Add a test to check the adjustment logic defined in
ColorSpace::adjust().

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

test/stream/meson.build

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: CC0-1.0
 
 stream_tests = [
+    ['stream_colorspace', 'stream_colorspace.cpp'],
     ['stream_formats',  'stream_formats.cpp'],
 ]
 

test/stream/stream_colorspace.cpp

@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2022, Ideas on Board Oy.
+ *
+ * stream_colorspace.cpp - Stream colorspace adjustment test
+ */
+
+#include <iostream>
+
+#include <libcamera/camera.h>
+#include <libcamera/formats.h>
+#include <libcamera/stream.h>
+
+#include "test.h"
+
+using namespace libcamera;
+using namespace std;
+
+class TestCameraConfiguration : public CameraConfiguration
+{
+public:
+	TestCameraConfiguration()
+		: CameraConfiguration()
+	{
+	}
+
+	Status validate() override
+	{
+		return validateColorSpaces();
+	}
+};
+
+class StreamColorSpaceTest : public Test
+{
+protected:
+	int run()
+	{
+		TestCameraConfiguration config;
+
+		StreamConfiguration cfg;
+		cfg.size = { 640, 320 };
+		cfg.pixelFormat = formats::YUV422;
+		cfg.colorSpace = ColorSpace::Srgb;
+		config.addConfiguration(cfg);
+
+		StreamConfiguration &streamCfg = config.at(0);
+
+		/*
+		 * YUV pixelformat with sRGB colorspace should have Y'CbCr encoding
+		 * adjusted.
+		 */
+		config.validate();
+		if (streamCfg.colorSpace->ycbcrEncoding == ColorSpace::YcbcrEncoding::None) {
+			cerr << "YUV format must have YCbCr encoding" << endl;
+			return TestFail;
+		}
+
+		/*
+		 * For YUV pixelFormat, encoding should be picked up according
+		 * to primaries and transfer function, if 'None' is specified.
+		 */
+		streamCfg.pixelFormat = formats::YUV422;
+		streamCfg.colorSpace = ColorSpace(ColorSpace::Primaries::Rec2020,
+						  ColorSpace::TransferFunction::Rec709,
+						  ColorSpace::YcbcrEncoding::None,
+						  ColorSpace::Range::Limited);
+		config.validate();
+		if (streamCfg.colorSpace->ycbcrEncoding != ColorSpace::YcbcrEncoding::Rec2020) {
+			cerr << "Failed to adjust colorspace Y'CbCr encoding according"
+			     << " to primaries and transfer function" << endl;
+			return TestFail;
+		}
+
+		/* For RGB pixelFormat, Sycc colorspace should get adjusted to sRGB. */
+		streamCfg.pixelFormat = formats::RGB888;
+		streamCfg.colorSpace = ColorSpace::Sycc;
+		config.validate();
+		if (streamCfg.colorSpace != ColorSpace::Srgb) {
+			cerr << "RGB format's colorspace should be set to Srgb" << endl;
+			return TestFail;
+		}
+
+		/* Raw formats should always set colorspace to ColorSpace::Raw. */
+		streamCfg.pixelFormat = formats::SBGGR8;
+		streamCfg.colorSpace = ColorSpace::Rec709;
+		config.validate();
+		if (streamCfg.colorSpace != ColorSpace::Raw) {
+			cerr << "Raw format must always have Raw colorspace" << endl;
+			return TestFail;
+		}
+
+		return TestPass;
+	}
+};
+
+TEST_REGISTER(StreamColorSpaceTest)