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pkg/pixman: fix math for bpp calculation

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This commit is contained in:
Mitchell Hashimoto
2022-11-23 20:20:52 -08:00
parent 894d36f28a
commit ac4a45bdf3
1 changed files with 3 additions and 2 deletions
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5
pkg/pixman/format.zig
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@ -96,8 +96,8 @@ pub const FormatCode = enum(c_uint) {
const val = @enumToInt(self); const val = @enumToInt(self);
const v1 = val >> ofs; const v1 = val >> ofs;
const v2 = @as(c_uint, 1) << num; const v2 = @as(c_uint, 1) << num;
const v3 = @intCast(u5, val >> 22); const v3 = @intCast(u5, (val >> 22) & 3);
return ((v1 & (v2 - 1)) << (v3 & 3)); return ((v1 & (v2 - 1)) << v3);
} }
}; };
@ -106,4 +106,5 @@ test "bpp" {
try testing.expectEqual(@as(u32, 1), FormatCode.g1.bpp()); try testing.expectEqual(@as(u32, 1), FormatCode.g1.bpp());
try testing.expectEqual(@as(u32, 4), FormatCode.g4.bpp()); try testing.expectEqual(@as(u32, 4), FormatCode.g4.bpp());
try testing.expectEqual(@as(u32, 8), FormatCode.g8.bpp());
} }