[libcamera-devel] [PATCH v2 07/10] ipa: raspberrypi: Add line length calculations helper functions

[Naushir Patuck]

Add CamHelper::hblankToLineLength() to calculate the line length duration
from the horizontal blanking (in pixels) value.

Add CamHelper::lineLengthToHblank() to calculate the horizontal blanking (in
pixels) value from the line length duration.

Add CamHelper::lineLengthPckToDuration() to calculate the line length duration
from the line length in pixels.

Signed-off-by: Naushir Patuck <naush at raspberrypi.com>
Tested-by: Dave Stevenson <dave.stevenson at raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
 src/ipa/raspberrypi/cam_helper.cpp | 16 ++++++++++++++++
 src/ipa/raspberrypi/cam_helper.h   |  3 +++
 2 files changed, 19 insertions(+)

diff --git a/src/ipa/raspberrypi/cam_helper.cpp b/src/ipa/raspberrypi/cam_helper.cpp
index dd7236f1b693..bc3f66a51254 100644
--- a/src/ipa/raspberrypi/cam_helper.cpp
+++ b/src/ipa/raspberrypi/cam_helper.cpp
@@ -18,6 +18,7 @@
 using namespace RPiController;
 using namespace libcamera;
 using libcamera::utils::Duration;
+using namespace std::literals::chrono_literals;
 
 namespace libcamera {
 LOG_DECLARE_CATEGORY(IPARPI)
@@ -96,6 +97,21 @@ uint32_t CamHelper::getVBlanking(Duration &exposure,
 	return vblank;
 }
 
+Duration CamHelper::hblankToLineLength(uint32_t hblank) const
+{
+	return (mode_.width + hblank) * (1.0s / mode_.pixelRate);
+}
+
+uint32_t CamHelper::lineLengthToHblank(const Duration &lineLength) const
+{
+	return (lineLength * mode_.pixelRate / 1.0s) - mode_.width;
+}
+
+Duration CamHelper::lineLengthPckToDuration(uint32_t lineLengthPck) const
+{
+	return lineLengthPck * (1.0s / mode_.pixelRate);
+}
+
 void CamHelper::setCameraMode(const CameraMode &mode)
 {
 	mode_ = mode;
diff --git a/src/ipa/raspberrypi/cam_helper.h b/src/ipa/raspberrypi/cam_helper.h
index db2387afc993..6cd1dd397b91 100644
--- a/src/ipa/raspberrypi/cam_helper.h
+++ b/src/ipa/raspberrypi/cam_helper.h
@@ -85,6 +85,9 @@ public:
 	virtual uint32_t getVBlanking(libcamera::utils::Duration &exposure,
 				      libcamera::utils::Duration minFrameDuration,
 				      libcamera::utils::Duration maxFrameDuration) const;
+	libcamera::utils::Duration hblankToLineLength(uint32_t hblank) const;
+	uint32_t lineLengthToHblank(const libcamera::utils::Duration &duration) const;
+	libcamera::utils::Duration lineLengthPckToDuration(uint32_t lineLengthPck) const;
 	virtual uint32_t gainCode(double gain) const = 0;
 	virtual double gain(uint32_t gainCode) const = 0;
 	virtual void getDelays(int &exposureDelay, int &gainDelay,
-- 
2.25.1