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internal/f32color: optimize LinearFromSRGB

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Previously each call was ~100ns, the new implementation is ~1ns.

Signed-off-by: Egon Elbre <egonelbre@gmail.com>
This commit is contained in:
Egon Elbre
2022-07-01 22:09:16 +03:00
committed by Elias Naur
parent 2adf4efcbd
commit 3670f70c01
4 changed files with 109 additions and 3 deletions
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internal/f32color/rgba.go
+5 -3
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@@ -7,6 +7,8 @@ import (
"math"
)
//go:generate go run ./f32colorgen -out tables.go
// RGBA is a 32 bit floating point linear premultiplied color space.
type RGBA struct {
R, G, B, A float32
@@ -53,9 +55,9 @@ func (col RGBA) Opaque() RGBA {
func LinearFromSRGB(col color.NRGBA) RGBA {
af := float32(col.A) / 0xFF
return RGBA{
R: sRGBToLinear(float32(col.R)/0xff) * af,
G: sRGBToLinear(float32(col.G)/0xff) * af,
B: sRGBToLinear(float32(col.B)/0xff) * af,
R: srgb8ToLinear[col.R] * af, // sRGBToLinear(float32(col.R)/0xff) * af,
G: srgb8ToLinear[col.G] * af, // sRGBToLinear(float32(col.G)/0xff) * af,
B: srgb8ToLinear[col.B] * af, // sRGBToLinear(float32(col.B)/0xff) * af,
A: af,
}
}