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Use new blend helper

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This commit is contained in:
Jeroen van Rijn
2024-06-09 16:37:27 +02:00
parent d2a2c1e74e
commit 6b88d0a820
2 changed files with 41 additions and 28 deletions
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core/image/common.odin
+35 -18
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@@ -42,23 +42,6 @@ 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,
@@ -1276,6 +1259,40 @@ apply_palette_rgba :: proc(img: ^Image, palette: [256]RGBA_Pixel, allocator := c
}
apply_palette :: proc{apply_palette_rgb, apply_palette_rgba}
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
when N == 1 {
r := u32(fg.r) * (MAX - u32(alpha)) + u32(bg.r) * (1 + u32(alpha))
return {T(r & (MAX - 1))}
}
when N == 2 {
r := u32(fg.r) * (MAX - u32(alpha)) + u32(bg.r) * (1 + u32(alpha))
g := u32(fg.g) * (MAX - u32(alpha)) + u32(bg.g) * (1 + u32(alpha))
return {T(r & (MAX - 1)), T(g & (MAX - 1))}
}
when N == 3 || N == 4 {
r := u32(fg.r) * (MAX - u32(alpha)) + u32(bg.r) * (1 + u32(alpha))
g := u32(fg.g) * (MAX - u32(alpha)) + u32(bg.g) * (1 + u32(alpha))
b := u32(fg.b) * (MAX - u32(alpha)) + u32(bg.b) * (1 + u32(alpha))
when N == 3 {
return {T(r & (MAX - 1)), T(g & (MAX - 1)), T(b & (MAX - 1))}
} else {
return {T(r & (MAX - 1)), T(g & (MAX - 1)), T(b & (MAX - 1)), MAX - 1}
}
}
unreachable()
}
blend :: proc{blend_single_channel, blend_pixel}
// Replicates grayscale values into RGB(A) 8- or 16-bit images as appropriate.
// Returns early with `false` if already an RGB(A) image.
@@ -1388,4 +1405,4 @@ write_bytes :: proc(buf: ^bytes.Buffer, data: []u8) -> (err: compress.General_Er
return .Resize_Failed
}
return nil
}
}