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| author | Frank Barchard <fbarchard@google.com> | 2017-11-20 11:37:36 -0800 |
|---|---|---|
| committer | Frank Barchard <fbarchard@google.com> | 2017-11-20 22:05:45 +0000 |
| commit | f2978400d5723ce8897dc629a04cda37cfe6fb34 (patch) | |
| tree | 730e07f7b3ebfd07c7bae780ecdfbf613710445a /docs | |
| parent | 12c904a97c81c3ef4cab0fc8fb1f0485b4ec4e8c (diff) | |
| download | libyuv-f2978400d5723ce8897dc629a04cda37cfe6fb34.tar.gz | |
Document AR30 format
Bug: libyuv:751
Test: none
Change-Id: If6d5e7b9c5e6e8d2a272e03ce5a1cc199ef364ca
Reviewed-on: https://chromium-review.googlesource.com/779980
Reviewed-by: Weiyong Yao <braveyao@chromium.org>
Reviewed-by: Frank Barchard <fbarchard@google.com>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/formats.md | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/docs/formats.md b/docs/formats.md index 2b75d31a..550e14bc 100644 --- a/docs/formats.md +++ b/docs/formats.md @@ -54,6 +54,7 @@ The following is extracted from video_common.h as a complete list of formats sup FOURCC_ARGB = FOURCC('A', 'R', 'G', 'B'), FOURCC_BGRA = FOURCC('B', 'G', 'R', 'A'), FOURCC_ABGR = FOURCC('A', 'B', 'G', 'R'), + FOURCC_AR30 = FOURCC('A', 'R', '3', '0'), FOURCC_24BG = FOURCC('2', '4', 'B', 'G'), FOURCC_RAW = FOURCC('r', 'a', 'w', ' '), FOURCC_RGBA = FOURCC('R', 'G', 'B', 'A'), @@ -145,3 +146,13 @@ There are 2 RGB layouts - RGB24 (aka 24BG) and RAW RGB24 is B,G,R in memory RAW is R,G,B in memory + +# AR30 + +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. +0 - 0. 00000000b = 0x00 = 0 +1 - 33%. 01010101b = 0x55 = 85 +2 - 66%. 10101010b = 0xaa = 170 +3 - 100%. 11111111b = 0xff = 255 +The 10 bit RGB values range from 0 to 1023. |