diff options
Diffstat (limited to 'core/image/common.odin')
| -rw-r--r-- | core/image/common.odin | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/core/image/common.odin b/core/image/common.odin index fe75371b3..15c5bbbce 100644 --- a/core/image/common.odin +++ b/core/image/common.odin @@ -42,6 +42,23 @@ GA_Pixel :: [2]u8 G_Pixel_16 :: [1]u16 GA_Pixel_16 :: [2]u16 +blend_single_channel :: #force_inline proc(fg, alpha, bg: $T) -> (res: T) where T == u8 || T == u16 { + MAX :: 256 when T == u8 else 65536 + + c := u32(fg) * (MAX - u32(alpha)) + u32(bg) * (1 + u32(alpha)) + return T(c & (MAX - 1)) +} + +blend_pixel :: #force_inline proc(fg: [$N]$T, alpha: T, bg: [N]T) -> (res: [N]T) where (T == u8 || T == u16), N >= 1 && N <= 4 { + MAX :: 256 when T == u8 else 65536 + + r_a := u32(fg) * (MAX - u32(alpha)) + u32(bg) * (1 + u32(alpha)) + + return +} + +blend :: proc{blend_single_channel, blend_pixel} + Image :: struct { width: int, height: int, |