[PATCH v2 0/7] drm/vkms: introduce plane rotation property

[Maíra Canal]

This patchset implements all possible rotation value in vkms. All operations
were implemented by software by changing the way the pixels are read. The way
the blending is performed can be depicted as:

- rotate-0:
                (x) ---->
    ----------------------
(y) |                    |
  | |                    |
  | |                    |
  ˇ |                    |
    ----------------------

- rotate-90:
    <---- (y)
    ----------------------
(x) |                    |
  | |                    |
  | |                    |
  ˇ |                    |
    ----------------------

- rotate-180:
    <---- (x)
    ----------------------
(y) |                    |
  ^ |                    |
  | |                    |
  | |                    |
    ----------------------

- rotate-270:
                (y) ---->
    ----------------------
(x) |                    |
  ^ |                    |
  | |                    |
  | |                    |
    ----------------------

- reflect-x:
    <---- (x)
    ----------------------
(y) |                    |
  | |                    |
  | |                    |
  ˇ |                    |
    ----------------------

- reflect-y:
                (x) ---->
    ----------------------
(y) |                    |
  ^ |                    |
  | |                    |
  | |                    |
    ----------------------

The patchset was tested with IGT's kms_rotation_crc tests and also with some
additional tests [1] for the reflection operations.

In order to avoid code duplication, I introduced a patch that isolates the
pixel format convertion and wraps it in a single loop.

v1 -> v2:

* Add patch to isolate pixel format convertion (Arthur Grillo).

[1] https://patchwork.freedesktop.org/series/116025/

Best Regards,
- Maíra Canal

Maíra Canal (7):
  drm/vkms: isolate pixel conversion functionality
  drm/vkms: add rotate-0 and rotate-180 properties
  drm/vkms: add rotate-90 property
  drm/vkms: add rotate-270 property
  drm/vkms: add reflect-x property
  drm/vkms: add reflect-y property
  drm/vkms: drop "Rotation" TODO

 Documentation/gpu/vkms.rst           |   2 +-
 drivers/gpu/drm/vkms/vkms_composer.c |  79 +++++++++++---
 drivers/gpu/drm/vkms/vkms_drv.h      |   5 +-
 drivers/gpu/drm/vkms/vkms_formats.c  | 153 ++++++++++++++-------------
 drivers/gpu/drm/vkms/vkms_formats.h  |   2 +-
 drivers/gpu/drm/vkms/vkms_plane.c    |  12 ++-
 6 files changed, 163 insertions(+), 90 deletions(-)

-- 
2.39.2