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docs(linux): Add documentation regaring DSS feature: cropping
This documentation includes examples showing the cropped part of a frame. Signed-off-by: Swamil Jain <[email protected]>
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@@ -490,8 +490,8 @@ tidss supports configuration via DRM properties. These are standard DRM properti | |
| GAMMA_LUT_SIZE | crtc | Number of elements in gammma lookup table. | | ||
+--------------------+----------+------------------------------------------------------------------------------------------------------+ | ||
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Testing tidss properties with modetest | ||
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
Testing tidss properties with modetest and kmstest | ||
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
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As the name suggests, ``modetest`` is DRM based mode setting test program available along with libdrm. | ||
It is an easy-to-use tool to test different features provided by display HWs. The DRM driver for, | ||
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@@ -663,6 +663,54 @@ The following example was run on DSS7-UL and hence the pipe with scaling capabil | |
Note that the ``*2`` at the end of ``-P 41@38:400x400*2`` is the scaling factor. | ||
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- **Cropping** | ||
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Show only a part of the frame. | ||
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User can specify a frame of size ``w x h``, with an input color format ``cf``, a view ``w1 x h1`` starting at coordinates ``x1,y1`` and a plane ``w2 x h2`` to be displayed starting at coordinates ``x2,y2``. To display a cropped part of the frame(``w x h``), the below command can be used: | ||
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.. code-block:: console | ||
$ kmstest -p <plane_number>:<x-coordinate>,<ycoordinate>-<plane_width>x<plane_height> -f <frame_width>x<frame_height>-<color-format> -v <view_number>:<x-coordinate>,<ycoordinate>-<view_width>x<view_height> | ||
$ kmstest -p 0:x2,y2-w2xh2 -f wxh-cf -v x1,y1-w1xh1 | ||
.. code-block:: console | ||
$ kmstest -c hdmi -p 0:0,0-1000x1000 -f 1000x1000-XR24 -v 0,0-1000x1000 | ||
Connector 1/@50: HDMI-A-1 | ||
Crtc 1/@48: [email protected] 138.500 1920/48/32/80/+ 1080/3/5/23/- 60 (59.93) 0x9 0x48 | ||
Plane 0/@31: 0,0-800x800 | ||
Fb 55 1000x1000-XR24 | ||
The above example views a ``1000x1000`` frame on a ``1000x1000`` plane starting at ``0,0``. | ||
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.. Image:: /images/DSS_cropping_example_1.jpg | ||
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.. code-block:: console | ||
$ kmstest -c hdmi -p 0:0,0-800x800 -f 1000x1000 -v 0,0-800x800 | ||
Connector 1/@50: HDMI-A-1 | ||
Crtc 1/@48: [email protected] 138.500 1920/48/32/80/+ 1080/3/5/23/- 60 (59.93) 0x9 0x48 | ||
Plane 0/@31: 0,0-400x400 | ||
Fb 55 1000x1000-XR24 | ||
The first example shows the whole ``800x800`` frame and second example shows cropped part ``(400x400)`` of the ``800x800`` frame. | ||
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.. Image:: /images/DSS_cropping_example_2.jpg | ||
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.. code-block:: console | ||
$ kmstest -c hdmi -p 0:500,200-800x800 -f 1000x1000 -v 200,100-800x800 | ||
Connector 1/@50: HDMI-A-1 | ||
Crtc 1/@48: [email protected] 138.500 1920/48/32/80/+ 1080/3/5/23/- 60 (59.93) 0x9 0x48 | ||
Plane 0/@31: 500,200-800x800 | ||
Fb 54 1000x1000-XR24 | ||
This example views the ``800x800`` cropped part of the frame starting at ``200,100`` on a ``800x800`` plane starting at ``500,200``. | ||
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.. Image:: /images/DSS_cropping_example_3.jpg | ||
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Buffers | ||
------- | ||
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