80 lines
1.5 KiB
Go
80 lines
1.5 KiB
Go
package d2dat
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// DATColor represents a single color in a DAT file.
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type DATColor struct {
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r uint8
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g uint8
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b uint8
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a uint8
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}
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const (
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colorBits = 8
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mask = 0xff
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)
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const (
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bitShift0 = iota * colorBits
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bitShift8
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bitShift16
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bitShift24
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)
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// R gets the red component
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func (c *DATColor) R() uint8 {
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return c.r
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}
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// G gets the green component
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func (c *DATColor) G() uint8 {
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return c.g
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}
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// B gets the blue component
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func (c *DATColor) B() uint8 {
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return c.b
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}
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// A gets the alpha component
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func (c *DATColor) A() uint8 {
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return mask
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}
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// RGBA gets the combination of the color components (0xRRGGBBAA)
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func (c *DATColor) RGBA() uint32 {
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return toComposite(c.r, c.g, c.b, c.a)
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}
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// SetRGBA sets the color components using the given RGBA form
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func (c *DATColor) SetRGBA(rgba uint32) {
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c.r, c.g, c.b, c.a = toComponent(rgba)
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}
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// BGRA gets the combination of the color components (0xBBGGRRAA)
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func (c *DATColor) BGRA() uint32 {
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return toComposite(c.b, c.g, c.r, c.a)
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}
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// SetBGRA sets the color components using the given BGRA form
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func (c *DATColor) SetBGRA(bgra uint32) {
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c.b, c.g, c.r, c.a = toComponent(bgra)
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}
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func toComposite(w, x, y, z uint8) uint32 {
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composite := uint32(w) << bitShift24
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composite += uint32(x) << bitShift16
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composite += uint32(y) << bitShift8
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composite += uint32(z) << bitShift0
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return composite
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}
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func toComponent(wxyz uint32) (w, x, y, z uint8) {
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w = uint8(wxyz >> bitShift24 & mask)
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x = uint8(wxyz >> bitShift16 & mask)
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y = uint8(wxyz >> bitShift8 & mask)
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z = uint8(wxyz >> bitShift0 & mask)
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return w, x, y, z
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}
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