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feat: implement image scaling on svg

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imgurbot12 2023-08-03 13:55:15 -07:00
parent a14ce28167
commit 8a219e6044
1 changed files with 11 additions and 6 deletions
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17
rmenu/src/image.rs
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@ -18,18 +18,23 @@ enum SvgError {
PngError(#[from] png::EncodingError),
}
fn svg_to_png(path: &str) -> Result<String, SvgError> {
fn svg_to_png(path: &str, pixels: u32) -> Result<String, SvgError> {
// read and convert to resvg document tree
let xml = read_to_string(path)?;
let opt = resvg::usvg::Options::default();
let tree = resvg::usvg::Tree::from_str(&xml, &opt)?;
let rtree = resvg::Tree::from_usvg(&tree);
// generate pixel-buffer
// generate pixel-buffer and scale according to size preference
let size = rtree.size.to_int_size();
let mut pixmap = resvg::tiny_skia::Pixmap::new(size.width(), size.height())
.ok_or_else(|| SvgError::NoPixBuf)?;
let scale = pixels / size.width();
let width = size.width() * scale;
let height = size.height() * scale;
let fscale = scale as f32;
let mut pixmap =
resvg::tiny_skia::Pixmap::new(width, height).ok_or_else(|| SvgError::NoPixBuf)?;
let form = resvg::tiny_skia::Transform::from_scale(fscale, fscale);
// render as png to memory
rtree.render(resvg::tiny_skia::Transform::default(), &mut pixmap.as_mut());
rtree.render(form, &mut pixmap.as_mut());
let mut png = pixmap.encode_png()?;
// base64 encode png
let encoded = general_purpose::STANDARD.encode(&mut png);
@ -38,5 +43,5 @@ fn svg_to_png(path: &str) -> Result<String, SvgError> {
#[cached]
pub fn convert_svg(path: String) -> Option<String> {
svg_to_png(&path).ok()
svg_to_png(&path, 64).ok()
}