Method set_importance_map

src/image.rs:177–184

Set which pixels are more important (and more likely to get a palette entry) The map must be `width`×`height` pixels large. Higher numbers = more important.

(&mut self, map: impl Into<Box<[u8]>>)

    ///
    /// The map must be `width`×`height` pixels large. Higher numbers = more important.
    pub fn set_importance_map(&mut self, map: impl Into<Box<[u8]>>) -> Result<(), Error> {
        let map = map.into();
        if map.len() != self.width() * self.height() {
            return Err(BufferTooSmall);
        }
        self.importance_map = Some(map);
        Ok(())
    }

    /// Remap pixels assuming they will be displayed on this background. This is designed for GIF's "keep" mode.
    ///