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d2pl2: added RGBA and SetRGBA methods (to implement HellSpawner/hswidget/hspalettegridwidget.PaletteColor)

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This commit is contained in:
M. Sz 2021-03-11 10:07:52 +01:00
parent 1ffafcb769
commit 0f08c722f5
1 changed files with 37 additions and 0 deletions
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37
d2common/d2fileformats/d2pl2/pl2_color.go
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@ -1,5 +1,12 @@
package d2pl2
const (
bitShift0 = 8 * iota
bitShift8
bitShift16
bitShift24
)
// PL2Color represents an RGBA color
type PL2Color struct {
R uint8
@ -7,3 +14,33 @@ type PL2Color struct {
B uint8
_ uint8
}
const (
mask = 0xff
)
func (p *PL2Color) RGBA() uint32 {
return toComposite(p.R, p.G, p.B, mask)
}
func (p *PL2Color) SetRGBA(rgba uint32) {
p.R, p.G, p.B, _ = toComponent(rgba)
}
func toComposite(w, x, y, z uint8) uint32 {
composite := uint32(w) << bitShift24
composite += uint32(x) << bitShift16
composite += uint32(y) << bitShift8
composite += uint32(z) << bitShift0
return composite
}
func toComponent(wxyz uint32) (w, x, y, z uint8) {
w = uint8(wxyz >> bitShift24 & mask)
x = uint8(wxyz >> bitShift16 & mask)
y = uint8(wxyz >> bitShift8 & mask)
z = uint8(wxyz >> bitShift0 & mask)
return w, x, y, z
}