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util: Add util_format_is_red

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This commit is contained in:
Mel Henning 2025-11-25 18:00:18 -05:00
parent f8f0d6ce0d
commit 212b9dcd38
2 changed files with 20 additions and 0 deletions
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17
src/util/format/u_format.c
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@ -302,6 +302,23 @@ util_format_is_luminance_alpha(enum pipe_format format)
return false;
}
bool
util_format_is_red(enum pipe_format format)
{
const struct util_format_description *desc =
util_format_description(format);
if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
desc->swizzle[0] == PIPE_SWIZZLE_X &&
desc->swizzle[1] == PIPE_SWIZZLE_0 &&
desc->swizzle[2] == PIPE_SWIZZLE_0 &&
desc->swizzle[3] == PIPE_SWIZZLE_1) {
return true;
}
return false;
}
bool
util_format_is_red_alpha(enum pipe_format format)
{

3
src/util/format/u_format.h
View file

@ -805,6 +805,9 @@ util_format_is_alpha(enum pipe_format format) ATTRIBUTE_CONST;
bool
util_format_is_luminance_alpha(enum pipe_format format) ATTRIBUTE_CONST;
bool
util_format_is_red(enum pipe_format format) ATTRIBUTE_CONST;
bool
util_format_is_red_alpha(enum pipe_format format) ATTRIBUTE_CONST;