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// 图像变换操作（纯 MoonBit）：crop / rotate / flip
// 支持 Image / Image16 / ImageF 三种类型
///|
/// 裁剪 8-bit Image 的指定区域
pub fn crop(
img : @types.Image,
x : Int,
y : Int,
w : Int,
h : Int,
) -> @types.Image raise @types.LoadError {
if x < 0 ||
y < 0 ||
w <= 0 ||
h <= 0 ||
x + w > img.width ||
y + h > img.height {
raise @types.LoadError::DecodeFailed("crop 区域越界")
}
let ch = img.channels
let out : Array[Byte] = Array::make(w * h * ch, b'\x00')
for row in 0..<h {
let src_off = ((y + row) * img.width + x) * ch
let dst_off = row * w * ch
for i in 0..<(w * ch) {
out[dst_off + i] = img.data[src_off + i]
}
}
@types.Image::{
width: w,
height: h,
channels: ch,
data: Bytes::from_array(out),
}
}
///|
/// 顺时针旋转 90 度
pub fn rotate_90(img : @types.Image) -> @types.Image {
let ch = img.channels
let new_w = img.height
let new_h = img.width
let out : Array[Byte] = Array::make(new_w * new_h * ch, b'\x00')
for y in 0..<img.height {
for x in 0..<img.width {
let nx = img.height - 1 - y
let ny = x
let src = (y * img.width + x) * ch
let dst = (ny * new_w + nx) * ch
for c in 0..<ch {
out[dst + c] = img.data[src + c]
}
}
}
@types.Image::{
width: new_w,
height: new_h,
channels: ch,
data: Bytes::from_array(out),
}
}
///|
/// 旋转 180 度
pub fn rotate_180(img : @types.Image) -> @types.Image {
let ch = img.channels
let out : Array[Byte] = Array::make(img.width * img.height * ch, b'\x00')
for y in 0..<img.height {
for x in 0..<img.width {
let nx = img.width - 1 - x
let ny = img.height - 1 - y
let src = (y * img.width + x) * ch
let dst = (ny * img.width + nx) * ch
for c in 0..<ch {
out[dst + c] = img.data[src + c]
}
}
}
@types.Image::{
width: img.width,
height: img.height,
channels: ch,
data: Bytes::from_array(out),
}
}
///|
/// 顺时针旋转 270 度（逆时针 90 度）
pub fn rotate_270(img : @types.Image) -> @types.Image {
let ch = img.channels
let new_w = img.height
let new_h = img.width
let out : Array[Byte] = Array::make(new_w * new_h * ch, b'\x00')
for y in 0..<img.height {
for x in 0..<img.width {
let nx = y
let ny = img.width - 1 - x
let src = (y * img.width + x) * ch
let dst = (ny * new_w + nx) * ch
for c in 0..<ch {
out[dst + c] = img.data[src + c]
}
}
}
@types.Image::{
width: new_w,
height: new_h,
channels: ch,
data: Bytes::from_array(out),
}
}
///|
/// 水平翻转（左右镜像）
pub fn flip_horizontal(img : @types.Image) -> @types.Image {
let ch = img.channels
let out : Array[Byte] = Array::make(img.width * img.height * ch, b'\x00')
for y in 0..<img.height {
for x in 0..<img.width {
let nx = img.width - 1 - x
let src = (y * img.width + x) * ch
let dst = (y * img.width + nx) * ch
for c in 0..<ch {
out[dst + c] = img.data[src + c]
}
}
}
@types.Image::{
width: img.width,
height: img.height,
channels: ch,
data: Bytes::from_array(out),
}
}
///|
/// 垂直翻转（上下镜像）
pub fn flip_vertical(img : @types.Image) -> @types.Image {
let ch = img.channels
let w = img.width
let h = img.height
let out : Array[Byte] = Array::make(w * h * ch, b'\x00')
for y in 0..<h {
for x in 0..<w {
let src_off = ((h - 1 - y) * w + x) * ch
let dst_off = (y * w + x) * ch
for c in 0..<ch {
out[dst_off + c] = img.data[src_off + c]
}
}
}
@types.Image::{
width: w,
height: h,
channels: ch,
data: Bytes::from_array(out),
}
}
///|
/// 裁剪 16-bit Image16
pub fn crop_16(
img : @types.Image16,
x : Int,
y : Int,
w : Int,
h : Int,
) -> @types.Image16 raise @types.LoadError {
if x < 0 ||
y < 0 ||
w <= 0 ||
h <= 0 ||
x + w > img.width ||
y + h > img.height {
raise @types.LoadError::DecodeFailed("crop 区域越界")
}
let ch = img.channels
let out : Array[Byte] = Array::make(w * h * ch * 2, b'\x00')
for row in 0..<h {
let src_off = ((y + row) * img.width + x) * ch * 2
let dst_off = row * w * ch * 2
for i in 0..<(w * ch * 2) {
out[dst_off + i] = img.data[src_off + i]
}
}
@types.Image16::{
width: w,
height: h,
channels: ch,
data: Bytes::from_array(out),
}
}
///|
/// 裁剪 float ImageF
pub fn crop_f(
img : @types.ImageF,
x : Int,
y : Int,
w : Int,
h : Int,
) -> @types.ImageF raise @types.LoadError {
if x < 0 ||
y < 0 ||
w <= 0 ||
h <= 0 ||
x + w > img.width ||
y + h > img.height {
raise @types.LoadError::DecodeFailed("crop 区域越界")
}
let ch = img.channels
let out : Array[Byte] = Array::make(w * h * ch * 4, b'\x00')
for row in 0..<h {
let src_off = ((y + row) * img.width + x) * ch * 4
let dst_off = row * w * ch * 4
for i in 0..<(w * ch * 4) {
out[dst_off + i] = img.data[src_off + i]
}
}
@types.ImageF::{
width: w,
height: h,
channels: ch,
data: Bytes::from_array(out),
}
}