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// 纯 MoonBit TGA 编码（全目标可用：native/wasm/js）
// 24-bit uncompressed true-color TGA, top-down, BGR
///|
/// TGA 编码（纯 MoonBit，全目标可用）。
pub fn encode_tga_pure(img : @types.Image) -> Bytes {
let width = img.width
let height = img.height
let channels = img.channels
let data = img.data
let out : Array[Byte] = []
// TGA Header (18 bytes)
out.push(b'\x00')
out.push(b'\x00')
out.push(b'\x02')
out.push(b'\x00')
out.push(b'\x00')
out.push(b'\x00')
out.push(b'\x00')
out.push(b'\x00')
out.push(b'\x00')
out.push(b'\x00')
out.push(b'\x00')
out.push(b'\x00')
out.push((width & 0xFF).to_byte())
out.push(((width >> 8) & 0xFF).to_byte())
out.push((height & 0xFF).to_byte())
out.push(((height >> 8) & 0xFF).to_byte())
out.push(b'\x18')
out.push(b'\x20')
// Pixel data (top-down, BGR)
for y in 0..<height {
let row_start = y * width * channels
for x in 0..<width {
let idx = row_start + x * channels
let r = data[idx].to_int()
let g = if channels >= 2 { data[idx + 1].to_int() } else { r }
let b = if channels >= 3 { data[idx + 2].to_int() } else { r }
out.push(b.to_byte())
out.push(g.to_byte())
out.push(r.to_byte())
}
}
Bytes::from_array(out)
}