On Fri, Feb 09, 2018 at 05:35:52PM -0800, Hyun Kwon wrote:
Multiple pixels can be grouped as a single unit and form a 'macro-pixel'. This is to model formats where multiple non-byte aligned pixels are stored together in a byte-aligned way. For example, if 3 - 10 bit pixels are stored in 32 bit, the 32 bit stroage can be treated as a single macro-pixel with 3 pixels. This aligns non-byte addressable formats with drm core where each pixel / component is expected to be byte aligned.
Add 'pixels_per_macro' to note how many pixels are in a macro-pixel. 'bytes_per_macro' specifies the size of a macro-pixel in bytes.
Signed-off-by: Hyun Kwon hyun.kwon@xilinx.com
v3
- Rename members and rephrase descriptions
- Rephrase the commit message
- Use in-line style comments
v2
- Introduce macro-pixel over scaling factors
include/drm/drm_fourcc.h | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-)
diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h index b00bae4..ce59329 100644 --- a/include/drm/drm_fourcc.h +++ b/include/drm/drm_fourcc.h @@ -58,11 +58,33 @@ struct drm_format_info { /** * @cpp: *
* Number of bytes per pixel (per plane)
* Number of bytes per pixel (per plane). @cpp shouldn't be used when* @pixels_per_macropixel and @bytes_per_macropixel are used.*/ u8 cpp[3];
/**
* @pixels_per_macropixel:** Number of pixels per macro-pixel (per plane). A macro-pixel is* composed of multiple pixels, and there can be extra bits between* pixels. This must be used along with @bytes_per_macropixel, only* when single pixel size is not byte-aligned. In this case, @cpp* is not valid and should be 0.*/u8 pixels_per_macropixel[3];
/*
* @bytes_per_macropixel:** Number of bytes per macro-pixel (per plane). A macro-pixel is* composed of multiple pixels. The size of single macro-pixel should* be byte-aligned. This should be used with @pixels_per_macropixel,* and @cpp should be 0.*/u8 bytes_per_macropixel[3];
Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch
- /**
- @hsub:
- Horizontal chroma subsampling factor
-- 2.7.4