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NV12 format documentation added.

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TBR=braveyao@chromium.org
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Change-Id: I3e5564ee2b92180c8c6c9cbad57f1a303ed7bca8
Reviewed-on: https://chromium-review.googlesource.com/879266
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
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Frank Barchard 2018-01-22 14:33:32 -08:00
parent 8af6ea4100
commit a11ffa1625
1 changed files with 12 additions and 1 deletions
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docs/formats.md
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@ -139,7 +139,7 @@ There are 2 RGB layouts - RGB24 (aka 24BG) and RAW
RGB24 is B,G,R in memory RGB24 is B,G,R in memory
RAW is R,G,B in memory RAW is R,G,B in memory
# AR30 # AR30 and XR30
AR30 is 2 10 10 10 ARGB stored in little endian order. AR30 is 2 10 10 10 ARGB stored in little endian order.
The 2 bit alpha has 4 values. Here are the comparable 8 bit alpha values. The 2 bit alpha has 4 values. Here are the comparable 8 bit alpha values.
@ -148,3 +148,14 @@ The 2 bit alpha has 4 values. Here are the comparable 8 bit alpha values.
2 - 66%. 10101010b = 0xaa = 170 2 - 66%. 10101010b = 0xaa = 170
3 - 100%. 11111111b = 0xff = 255 3 - 100%. 11111111b = 0xff = 255
The 10 bit RGB values range from 0 to 1023. The 10 bit RGB values range from 0 to 1023.
XR30 is the same as AR30 but with no alpha channel.
# NV12 and NV21
NV12 is a biplanar format with a full sized Y plane followed by a single
chroma plane with weaved U and V values.
NV21 is the same but with weaved V and U values.
The 12 in NV12 refers to 12 bits per pixel. NV12 has a half width and half
height chroma channel, and therefore is a 420 subsampling.
NV16 is 16 bits per pixel, with half width and full height. aka 422.
NV24 is 24 bits per pixel with full sized chroma channel. aka 444.