test: Add unit tests for the BayerFormat class

Test all of the present methods including the newly implemented
`fromV4L2PixelFormat`, as well as the new operators `==/!=`.

Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@posteo.net>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

test/bayer-format.cpp

@@ -0,0 +1,210 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2020, Sebastian Fricke
+ *
+ * bayer_format.cpp - BayerFormat class tests
+ */
+
+#include <iostream>
+
+#include <libcamera/internal/bayer_format.h>
+#include <libcamera/transform.h>
+
+#include "test.h"
+
+using namespace std;
+using namespace libcamera;
+
+class BayerFormatTest : public Test
+{
+protected:
+	int run()
+	{
+		/* An empty Bayer format has to be invalid. */
+		BayerFormat bayerFmt;
+		if (bayerFmt.isValid()) {
+			cerr << "An empty BayerFormat has to be invalid."
+			     << endl;
+			return TestFail;
+		}
+
+		/* A correct Bayer format has to be valid. */
+		bayerFmt = BayerFormat(BayerFormat::BGGR, 8, BayerFormat::None);
+		if (!bayerFmt.isValid()) {
+			cerr << "A correct BayerFormat has to be valid."
+			     << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Two bayer formats created with the same order and bit depth
+		 * have to be equal.
+		 */
+		bayerFmt = BayerFormat(BayerFormat::BGGR, 8, BayerFormat::None);
+		BayerFormat bayerFmtExpect = BayerFormat(BayerFormat::BGGR, 8,
+							 BayerFormat::None);
+		if (bayerFmt != bayerFmtExpect) {
+			cerr << "Comparison of identical formats failed."
+			     << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Two Bayer formats created with the same order but with a
+		 * different bitDepth are not equal.
+		 */
+		bayerFmt = BayerFormat(BayerFormat::BGGR, 8, BayerFormat::None);
+		bayerFmtExpect = BayerFormat(BayerFormat::BGGR, 12,
+					     BayerFormat::None);
+		if (bayerFmt == bayerFmtExpect) {
+			cerr << "Comparison of different formats failed."
+			     << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Create a Bayer format with a V4L2PixelFormat and check if we
+		 * get the same format after converting back to the V4L2 Format.
+		 */
+		V4L2PixelFormat v4l2FmtExpect = V4L2PixelFormat(
+			V4L2_PIX_FMT_SBGGR8);
+		bayerFmt = BayerFormat::fromV4L2PixelFormat(v4l2FmtExpect);
+		V4L2PixelFormat v4l2Fmt = bayerFmt.toV4L2PixelFormat();
+		if (v4l2Fmt != v4l2FmtExpect) {
+			cerr << "Expected: '" << v4l2FmtExpect.toString()
+			     << "' got: '" << v4l2Fmt.toString() << "'" << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Use an empty Bayer format and verify that no matching
+		 * V4L2PixelFormat is found.
+		 */
+		v4l2FmtExpect = V4L2PixelFormat();
+		bayerFmt = BayerFormat();
+		v4l2Fmt = bayerFmt.toV4L2PixelFormat();
+		if (v4l2Fmt != v4l2FmtExpect) {
+			cerr << "Expected: empty V4L2PixelFormat got: '"
+			     << v4l2Fmt.toString() << "'" << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Check if we get the expected Bayer format BGGR8
+		 * when we convert the V4L2PixelFormat (V4L2_PIX_FMT_SBGGR8)
+		 * to a Bayer format.
+		 */
+		bayerFmtExpect = BayerFormat(BayerFormat::BGGR, 8,
+					     BayerFormat::None);
+		v4l2Fmt = V4L2PixelFormat(V4L2_PIX_FMT_SBGGR8);
+		bayerFmt = BayerFormat::fromV4L2PixelFormat(v4l2Fmt);
+		if (bayerFmt != bayerFmtExpect) {
+			cerr << "Expected BayerFormat '"
+			     << bayerFmtExpect.toString() << "', got: '"
+			     << bayerFmt.toString() << "'" << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Confirm that a V4L2PixelFormat that is not found in
+		 * the conversion table, doesn't yield a Bayer format.
+		 */
+		V4L2PixelFormat v4l2FmtUnknown = V4L2PixelFormat(
+			V4L2_PIX_FMT_BGRA444);
+		bayerFmt = BayerFormat::fromV4L2PixelFormat(v4l2FmtUnknown);
+		if (bayerFmt.isValid()) {
+			cerr << "Expected empty BayerFormat got: '"
+			     << bayerFmt.toString() << "'" << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Test if a valid Bayer format can be converted to a
+		 * string representation.
+		 */
+		bayerFmt = BayerFormat(BayerFormat::BGGR, 8, BayerFormat::None);
+		if (bayerFmt.toString() != "BGGR-8") {
+			cerr << "String representation != 'BGGR-8' (got: '"
+			     << bayerFmt.toString() << "' ) " << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Determine if an empty Bayer format results in no
+		 * string representation.
+		 */
+		bayerFmt = BayerFormat();
+		if (bayerFmt.toString() != "INVALID") {
+			cerr << "String representation != 'INVALID' (got: '"
+			     << bayerFmt.toString() << "' ) " << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Perform a horizontal Flip and make sure that the
+		 * order is adjusted accordingly.
+		 */
+		bayerFmt = BayerFormat(BayerFormat::BGGR, 8, BayerFormat::None);
+		bayerFmtExpect = BayerFormat(BayerFormat::GBRG, 8,
+					     BayerFormat::None);
+		BayerFormat hFlipFmt = bayerFmt.transform(Transform::HFlip);
+		if (hFlipFmt != bayerFmtExpect) {
+			cerr << "Horizontal flip of 'BGGR-8' should result in '"
+			     << bayerFmtExpect.toString() << "', got: '"
+			     << hFlipFmt.toString() << "'" << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Perform a vertical Flip and make sure that
+		 * the order is adjusted accordingly.
+		 */
+		bayerFmt = BayerFormat(BayerFormat::BGGR, 8, BayerFormat::None);
+		bayerFmtExpect = BayerFormat(BayerFormat::GRBG, 8,
+					     BayerFormat::None);
+		BayerFormat vFlipFmt = bayerFmt.transform(Transform::VFlip);
+		if (vFlipFmt != bayerFmtExpect) {
+			cerr << "Vertical flip of 'BGGR-8' should result in '"
+			     << bayerFmtExpect.toString() << "', got: '"
+			     << vFlipFmt.toString() << "'" << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Perform a transposition on a pixel order with both green
+		 * pixels on the bottom left to top right diagonal and make
+		 * sure, that it doesn't change.
+		 */
+		bayerFmt = BayerFormat(BayerFormat::BGGR, 8, BayerFormat::None);
+		BayerFormat transposeFmt = bayerFmt.transform(
+			Transform::Transpose);
+		if (transposeFmt != bayerFmt) {
+			cerr << "Transpose with both green pixels on the "
+			     << "antidiagonal should not change the order "
+			     << "(got '" << transposeFmt.toString() << "')"
+			     << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Perform a transposition on an pixel order with red and blue
+		 * on the bottom left to top right diagonal and make sure
+		 * that their positions are switched.
+		 */
+		bayerFmt = BayerFormat(BayerFormat::GBRG, 8, BayerFormat::None);
+		bayerFmtExpect = BayerFormat(BayerFormat::GRBG, 8,
+					     BayerFormat::None);
+		transposeFmt = bayerFmt.transform(Transform::Transpose);
+		if (transposeFmt != bayerFmtExpect) {
+			cerr << "Transpose with the red & blue pixels on the "
+			     << "antidiagonal should switch their position "
+			     << "(got '" << transposeFmt.toString() << "')"
+			     << endl;
+			return TestFail;
+		}
+
+		return TestPass;
+	}
+};
+
+TEST_REGISTER(BayerFormatTest)

test/meson.build

@@ -27,6 +27,7 @@ public_tests = [
 ]
 
 internal_tests = [
+    ['bayer-format',                    'bayer-format.cpp'],
     ['byte-stream-buffer',              'byte-stream-buffer.cpp'],
     ['camera-sensor',                   'camera-sensor.cpp'],
     ['delayed_contols',                 'delayed_contols.cpp'],