[libcamera-devel] [RFC PATCH v2 1/5] libcamera: camera_sensor: Reverse the key and value of test pattern mode map

[Hirokazu Honda]

The key and value of the test pattern mode are originally the index of
v4l2 control and the corresponding test pattern mode control value.
This key and value are useful in the initialization for reporting
available test pattern modes. However, the map of the reversed key and
value is much more useful in applying a requested test pattern mode.
Reverses the key and value of the map as the initialization is one
time but the test pattern mode request will be multiple times.

Signed-off-by: Hirokazu Honda <hiroh at chromium.org>
---
 src/libcamera/camera_sensor.cpp            |  8 +++++--
 src/libcamera/camera_sensor_properties.cpp | 28 +++++++++++-----------
 2 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
index 3e135353..70bbd97a 100644
--- a/src/libcamera/camera_sensor.cpp
+++ b/src/libcamera/camera_sensor.cpp
@@ -319,11 +319,15 @@ void CameraSensor::initTestPatternModes(
 		return;
 	}
 
+	std::map<int32_t, int32_t> indexToTestPatternMode;
+	for (const auto& it : testPatternModes)
+		indexToTestPatternMode[it.second] = it.first;
+
 	for (const ControlValue &value : v4l2TestPattern->second.values()) {
 		const int32_t index = value.get<int32_t>();
 
-		const auto it = testPatternModes.find(index);
-		if (it == testPatternModes.end()) {
+		const auto it = indexToTestPatternMode.find(index);
+		if (it == indexToTestPatternMode.end()) {
 			LOG(CameraSensor, Debug)
 				<< "Test pattern mode " << index << " ignored";
 			continue;
diff --git a/src/libcamera/camera_sensor_properties.cpp b/src/libcamera/camera_sensor_properties.cpp
index f660743a..d0b2ae0e 100644
--- a/src/libcamera/camera_sensor_properties.cpp
+++ b/src/libcamera/camera_sensor_properties.cpp
@@ -38,9 +38,9 @@ LOG_DEFINE_CATEGORY(CameraSensorProperties)
  * \brief The physical size of a pixel, including pixel edges, in nanometers.
  *
  * \var CameraSensorProperties::testPatternModes
- * \brief Map that associates the indexes of the sensor test pattern modes as
- * returned by V4L2_CID_TEST_PATTERN with the corresponding TestPattern
- * control value
+ * \brief Map that associates the TestPattern control value with the indexes of
+ * the corresponding sensor test pattern modes as returned by
+ * V4L2_CID_TEST_PATTERN.
  */
 
 /**
@@ -55,11 +55,11 @@ const CameraSensorProperties *CameraSensorProperties::get(const std::string &sen
 		{ "imx219", {
 			.unitCellSize = { 1120, 1120 },
 			.testPatternModes = {
-				{ 0, controls::draft::TestPatternModeOff },
-				{ 1, controls::draft::TestPatternModeColorBars },
-				{ 2, controls::draft::TestPatternModeSolidColor },
-				{ 3, controls::draft::TestPatternModeColorBarsFadeToGray },
-				{ 4, controls::draft::TestPatternModePn9 },
+				{ controls::draft::TestPatternModeOff, 0 },
+				{ controls::draft::TestPatternModeColorBars, 1 },
+				{ controls::draft::TestPatternModeSolidColor, 2 },
+				{ controls::draft::TestPatternModeColorBarsFadeToGray, 3 },
+				{ controls::draft::TestPatternModePn9, 4 },
 			},
 		} },
 		{ "imx258", {
@@ -70,22 +70,22 @@ const CameraSensorProperties *CameraSensorProperties::get(const std::string &sen
 		{ "ov5670", {
 			.unitCellSize = { 1120, 1120 },
 			.testPatternModes = {
-				{ 0, controls::draft::TestPatternModeOff },
-				{ 1, controls::draft::TestPatternModeColorBars },
+				{ controls::draft::TestPatternModeOff, 0 },
+				{ controls::draft::TestPatternModeColorBars, 1 },
 			},
 		} },
 		{ "ov13858", {
 			.unitCellSize = { 1120, 1120 },
 			.testPatternModes =  {
-				{ 0, controls::draft::TestPatternModeOff },
-				{ 1, controls::draft::TestPatternModeColorBars },
+				{ controls::draft::TestPatternModeOff, 0 },
+				{ controls::draft::TestPatternModeColorBars, 1 },
 			},
 		} },
 		{ "ov5693", {
 			.unitCellSize = { 1400, 1400 },
 			.testPatternModes = {
-				{ 0, controls::draft::TestPatternModeOff },
-				{ 2, controls::draft::TestPatternModeColorBars },
+				{ controls::draft::TestPatternModeOff, 0 },
+				{ controls::draft::TestPatternModeColorBars, 2 },
 				/*
 				 * No corresponding test pattern mode for
 				 * 1: "Random data" and 3: "Colour Bars with
-- 
2.32.0.288.g62a8d224e6-goog