func NewMemPImageFrom(m image.Image) *MemPImage {
if p, ok := m.(*MemPImage); ok {
return p.Clone()
}
if p, ok := AsMemPImage(m); ok {
return p.Clone()
}
switch m := m.(type) {
case *image.Gray:
b := m.Bounds()
p := NewMemPImage(b, 1, reflect.Uint8)
for y := b.Min.Y; y < b.Max.Y; y++ {
off0 := m.PixOffset(0, y)
off1 := p.PixOffset(0, y)
copy(p.XPix[off1:][:p.XStride], m.Pix[off0:][:m.Stride])
off0 += m.Stride
off1 += p.XStride
}
return p
case *image.Gray16:
b := m.Bounds()
p := NewMemPImage(b, 1, reflect.Uint16)
for y := b.Min.Y; y < b.Max.Y; y++ {
off0 := m.PixOffset(0, y)
off1 := p.PixOffset(0, y)
copy(p.XPix[off1:][:p.XStride], m.Pix[off0:][:m.Stride])
off0 += m.Stride
off1 += p.XStride
}
if isLittleEndian {
p.XPix.SwapEndian(p.XDataType)
}
return p
case *image.RGBA:
b := m.Bounds()
p := NewMemPImage(b, 4, reflect.Uint8)
for y := b.Min.Y; y < b.Max.Y; y++ {
off0 := m.PixOffset(0, y)
off1 := p.PixOffset(0, y)
copy(p.XPix[off1:][:p.XStride], m.Pix[off0:][:m.Stride])
off0 += m.Stride
off1 += p.XStride
}
return p
case *image.RGBA64:
b := m.Bounds()
p := NewMemPImage(b, 4, reflect.Uint16)
for y := b.Min.Y; y < b.Max.Y; y++ {
off0 := m.PixOffset(0, y)
off1 := p.PixOffset(0, y)
copy(p.XPix[off1:][:p.XStride], m.Pix[off0:][:m.Stride])
off0 += m.Stride
off1 += p.XStride
}
if isLittleEndian {
p.XPix.SwapEndian(p.XDataType)
}
return p
case *image.YCbCr:
b := m.Bounds()
p := NewMemPImage(b, 4, reflect.Uint8)
for y := b.Min.Y; y < b.Max.Y; y++ {
for x := b.Min.X; x < b.Max.X; x++ {
R, G, B, A := m.At(x, y).RGBA()
i := p.PixOffset(x, y)
p.XPix[i+0] = uint8(R >> 8)
p.XPix[i+1] = uint8(G >> 8)
p.XPix[i+2] = uint8(B >> 8)
p.XPix[i+3] = uint8(A >> 8)
}
}
return p
default:
b := m.Bounds()
p := NewMemPImage(b, 4, reflect.Uint16)
for y := b.Min.Y; y < b.Max.Y; y++ {
for x := b.Min.X; x < b.Max.X; x++ {
R, G, B, A := m.At(x, y).RGBA()
i := p.PixOffset(x, y)
p.XPix[i+0] = uint8(R >> 8)
p.XPix[i+1] = uint8(R)
p.XPix[i+2] = uint8(G >> 8)
p.XPix[i+3] = uint8(G)
p.XPix[i+4] = uint8(B >> 8)
p.XPix[i+5] = uint8(B)
p.XPix[i+6] = uint8(A >> 8)
p.XPix[i+7] = uint8(A)
}
}
return p
}
}