70 lines
1.9 KiB
Rust
70 lines
1.9 KiB
Rust
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#[derive(Debug)]
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pub struct ScaleParam {
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pub src_width: u32,
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pub src_height: u32,
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pub dst_width: u32,
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pub dst_height: u32,
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pub scale_width: f32,
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pub scale_height: f32,
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}
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impl ScaleParam {
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pub fn new(
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src_width: u32,
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src_height: u32,
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dst_width: u32,
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dst_height: u32,
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scale_width: f32,
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scale_height: f32,
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) -> Self {
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Self {
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src_width,
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src_height,
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dst_width,
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dst_height,
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scale_width,
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scale_height,
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}
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}
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pub fn get_scale_param(src: &image::RgbImage, target_size: u32) -> Self {
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let src_width = src.width();
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let src_height = src.height();
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let mut dst_width;
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let mut dst_height;
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let ratio: f32 = if src_width > src_height {
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target_size as f32 / src_width as f32
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} else {
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target_size as f32 / src_height as f32
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};
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dst_width = (src_width as f32 * ratio) as u32;
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dst_height = (src_height as f32 * ratio) as u32;
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if dst_width % 32 != 0 {
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dst_width = (dst_width / 32) * 32;
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dst_width = dst_width.max(32);
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}
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if dst_height % 32 != 0 {
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dst_height = (dst_height / 32) * 32;
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dst_height = dst_height.max(32);
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}
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let scale_width = dst_width as f32 / src_width as f32;
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let scale_height = dst_height as f32 / src_height as f32;
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Self::new(src_width, src_height, dst_width, dst_height, scale_width, scale_height)
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}
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}
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impl std::fmt::Display for ScaleParam {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(
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f,
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"src_width:{},src_height:{},dst_width:{},dst_height:{},scale_width:{},scale_height:{}",
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self.src_width, self.src_height, self.dst_width, self.dst_height, self.scale_width, self.scale_height
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)
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}
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}
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