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color-representation-v1: Add wlr enums + converters

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Add wlr-internal enums for the properties specified in
color-representation-v1 (encoding, range, chroma siting, alpha mode) so
that other parts of wlroots can use these without depending on the
protocol specifics and without needing to include the protocol headers.
Also add conversion functions to convert the protocol enum values into
the wlroots enum values.
This commit is contained in:
David Turner 2025-07-17 10:55:11 +01:00
parent eff620770c
commit a4eb2cff46
3 changed files with 126 additions and 0 deletions
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51
include/wlr/render/color.h
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@ -30,6 +30,57 @@ enum wlr_color_transfer_function {
WLR_COLOR_TRANSFER_FUNCTION_EXT_LINEAR = 1 << 2,
};
/**
* Specifies alpha blending modes. Note that premultiplied_electrical
* is the default, so there is no "none" or "unset" value.
*/
enum wlr_alpha_mode {
WLR_COLOR_ALPHA_MODE_PREMULTIPLIED_ELECTRICAL,
WLR_COLOR_ALPHA_MODE_PREMULTIPLIED_OPTICAL,
WLR_COLOR_ALPHA_MODE_STRAIGHT,
};
/**
* Well-known color encodings, each representing a set of matrix coefficients
* used to convert that particular YCbCr encoding to RGB. NONE means the
* value is unset or unknown.
*/
enum wlr_color_encoding {
WLR_COLOR_ENCODING_NONE,
WLR_COLOR_ENCODING_IDENTITY,
WLR_COLOR_ENCODING_BT709,
WLR_COLOR_ENCODING_FCC,
WLR_COLOR_ENCODING_BT601,
WLR_COLOR_ENCODING_SMPTE240,
WLR_COLOR_ENCODING_BT2020,
WLR_COLOR_ENCODING_BT2020_CL,
WLR_COLOR_ENCODING_ICTCP,
};
/**
* Specifies whether a particular color-encoding uses full- or limited-range
* values. NONE means the value is unset or unknown.
*/
enum wlr_color_range {
WLR_COLOR_RANGE_NONE,
WLR_COLOR_RANGE_LIMITED,
WLR_COLOR_RANGE_FULL,
};
/**
* Chroma sample locations, corresponding to Chroma420SampleLocType code
* points in H.273. NONE means the value is unset or unknown.
*/
enum wlr_color_chroma_location {
WLR_COLOR_CHROMA_LOCATION_NONE,
WLR_COLOR_CHROMA_LOCATION_TYPE0,
WLR_COLOR_CHROMA_LOCATION_TYPE1,
WLR_COLOR_CHROMA_LOCATION_TYPE2,
WLR_COLOR_CHROMA_LOCATION_TYPE3,
WLR_COLOR_CHROMA_LOCATION_TYPE4,
WLR_COLOR_CHROMA_LOCATION_TYPE5,
};
/**
* CIE 1931 xy chromaticity coordinates.
*/