[PATCH v4 0/5] libcamera: rkisp1: Plumb the ConverterDW100 converter

[Umang Jain]

This series intends to support i.MX8MP DW100 dewarper in rkisp1 pipeline
handler. It is modelled as Converter (inherited from V4L2M2MConverter)
and has a helper to support scaler crop control. The converter acts
as a base for now, additional development around dewarping capabilites
and support in simple pipeline-handler [1] can be added on top as
focused tasks.

Patch 1/5 add ability to add features to the Converter interface.
Each Converter can dictate its own features it can support

Patch 2/5 adds crop feature and gets implemented in the V4L2 M2M
converter. 

Patch 3/5 prepares the rkisp1 pipeline handler to register controls
for the camera, outside of the IPA. The ConverterDW100 will let us support
scaler crop - which will be registered as one of the camera controls.

Patch 4/5 adds a ConverterDW100 class inheriting from
converter_v4l2_m2m. This provides a scaler crop setting helper.
A \todo is added here to handle the case when rectangles get modified
while applying. This requires a bit of dicussion I think.

Patch 5/5 plumbs the ConverterDW100 in the rkisp1 pipeline handler

This series is based on top of [2]

Testing:
--------
The series is tested on i.MX8MP and cam utility, by setting scaler crop
control via capture script with IMX283 attached to isp0.

changes in v4:
- rework Converter Interface to expose Features
- Add Crop Feature interface in Converter setCrop and setCropBound
- Implement cropping in V4L2M2MConverter for V4L2 M2M based converters
- Introduce useDewarper_ to denote when to use dewarper (simplied code
  reading).
- Trivial typo fixing.

Changes in v3:
- Base on top of [2]
- Model dewarper class as converter, so can be used with Simple
  pipeline-handler/ISI

Changes in v2:
- Fix raw capture configuration, disable dewarper in that case

[1]: Supporting the ConverterDW100 is simple pipeline handler should be
easy, adding the compatibles string and registering the converter with
REGISTER_CONVERTER(). However, for testing the
i.MX8MP -> ISI -> ConverterDW100 (dewarper) requires me to have a YUV
sensor attached, which I have not abled to source it yet. Once I source
it, I will test the ConverterDW100 on simple pipeline handler (I don't
expect any issues there but still..) and prepare a integration patch.
I hope this doesn't act as blocker for the series.

[2] [PATCH v4 0/4] libcamera: converter: Replace usage of stream index by Stream pointer

Umang Jain (5):
  libcamera: converter: Add interface for feature flags
  libcamera: converter: Add interface to support cropping capability
  libcamera: rkisp1: Prepare for additional camera controls
  libcamera: converter: Add DW100 converter class
  libcamera: rkisp1: Plumb the ConverterDW100 converter

 include/libcamera/internal/converter.h        |  18 +-
 .../internal/converter/converter_dw100.h      |  26 +++
 .../internal/converter/converter_v4l2_m2m.h   |   9 +-
 .../libcamera/internal/converter/meson.build  |   1 +
 include/libcamera/internal/v4l2_videodevice.h |   1 +
 src/libcamera/converter.cpp                   |  57 +++++-
 src/libcamera/converter/converter_dw100.cpp   |  64 +++++++
 .../converter/converter_v4l2_m2m.cpp          |  90 ++++++++-
 src/libcamera/converter/meson.build           |   1 +
 src/libcamera/pipeline/rkisp1/rkisp1.cpp      | 172 +++++++++++++++++-
 src/libcamera/pipeline/rkisp1/rkisp1_path.cpp |  12 +-
 src/libcamera/pipeline/rkisp1/rkisp1_path.h   |  14 ++
 src/libcamera/v4l2_videodevice.cpp            |  32 ++++
 13 files changed, 480 insertions(+), 17 deletions(-)
 create mode 100644 include/libcamera/internal/converter/converter_dw100.h
 create mode 100644 src/libcamera/converter/converter_dw100.cpp

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2.44.0