53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
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package skin
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import (
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"image"
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"image/color"
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)
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// Cape represents the cape that a skin may additionally have. A skin is of a fixed size (always 32x64 bytes)
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// and may be either empty or of that size.
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type Cape struct {
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w, h int
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// Pix holds the colour data of the cape in an RGBA byte array, similarly to the way that the pixels of
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// a Skin are stored.
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// The size of Pix is always 32 * 64 * 4 bytes.
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Pix []uint8
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}
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// NewCape initialises a new Cape using the width and height passed. The pixels are pre-allocated so that the
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// Cape may be used immediately.
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func NewCape(width, height int) Cape {
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return Cape{w: width, h: height, Pix: make([]uint8, width*height*4)}
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}
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// ColorModel ...
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func (c Cape) ColorModel() color.Model {
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return color.RGBAModel
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}
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// Bounds returns the bounds of the cape, which is always 32x64 or 0x0, depending on if the cape has any data
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// in it.
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func (c Cape) Bounds() image.Rectangle {
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return image.Rectangle{
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Max: image.Point{X: c.w, Y: c.h},
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}
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}
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// At returns the colour at a given position in the cape, provided the X and Y are within the bounds of the
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// cape passed during construction.
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// The concrete type returned by At is a color.RGBA value.
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func (c Cape) At(x, y int) color.Color {
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if x < 0 || y < 0 || x >= c.w || y >= c.h {
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panic("pixel coordinates out of bounds")
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}
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offset := x*4 + c.w*y*4
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return color.RGBA{
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R: c.Pix[offset],
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G: c.Pix[offset+1],
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B: c.Pix[offset+2],
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A: c.Pix[offset+3],
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}
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}
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