72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
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package artist
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import "image"
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import "image/color"
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// Uniform is an infinite-sized Image of uniform color. It implements the
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// color.Color, color.Model, and tomo.Image interfaces.
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type Uniform struct {
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C color.RGBA
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}
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// NewUniform returns a new Uniform image of the given color.
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func NewUniform (c color.Color) (uniform *Uniform) {
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uniform = &Uniform { }
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r, g, b, a := c.RGBA()
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uniform.C.R = uint8(r >> 8)
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uniform.C.G = uint8(g >> 8)
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uniform.C.B = uint8(b >> 8)
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uniform.C.A = uint8(a >> 8)
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return
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}
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func (uniform *Uniform) RGBA () (r, g, b, a uint32) {
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r = uint32(uniform.C.R) << 8 | uint32(uniform.C.R)
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g = uint32(uniform.C.G) << 8 | uint32(uniform.C.G)
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b = uint32(uniform.C.B) << 8 | uint32(uniform.C.B)
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a = uint32(uniform.C.A) << 8 | uint32(uniform.C.A)
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return
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}
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func (uniform *Uniform) ColorModel () (model color.Model) {
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model = uniform
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return
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}
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func (uniform *Uniform) Convert (in color.Color) (out color.Color) {
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out = uniform.C
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return
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}
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func (uniform *Uniform) Bounds () (rectangle image.Rectangle) {
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rectangle.Min = image.Point { -1e9, -1e9 }
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rectangle.Max = image.Point { 1e9, 1e9 }
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return
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}
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func (uniform *Uniform) At (x, y int) (c color.Color) {
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c = uniform.C
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return
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}
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func (uniform *Uniform) RGBAAt (x, y int) (c color.RGBA) {
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c = uniform.C
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return
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}
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func (uniform *Uniform) RGBA64At (x, y int) (c color.RGBA64) {
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r := uint16(uniform.C.R) << 8 | uint16(uniform.C.R)
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g := uint16(uniform.C.G) << 8 | uint16(uniform.C.G)
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b := uint16(uniform.C.B) << 8 | uint16(uniform.C.B)
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a := uint16(uniform.C.A) << 8 | uint16(uniform.C.A)
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c = color.RGBA64 { R: r, G: g, B: b, A: a }
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return
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}
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// Opaque scans the entire image and reports whether it is fully opaque.
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func (uniform *Uniform) Opaque () (opaque bool) {
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opaque = uniform.C.A == 0xFF
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return
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}
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