//! QuickDraw PICT R5G5B5 `PixMap`s.

use crate::{bin::u16b, err::*, image::{*, pict::{pm, rle}}};

/// Reads a R5G5B5 `PixMap`.
pub fn read(mut im: Image8,
            b: &[u8],
            hdr: pm::head::Header) -> ResultS<Image8>
{
   let mut p = 0;

   if hdr.pitch < 8 || hdr.pack_t == pm::head::PackType::None {
      // uncompressed R5G5B5
      for _ in 0..im.h() {
         for _ in 0..im.w() {
            let cr = u16b(&b[p..]);

            im.cr.push(r5g5b5_to_rgb8(cr));
            p += 2;
         }
      }

      Ok(im)
   } else if hdr.rle {
      // RLE compressed R5G5B5
      for _ in 0..im.h() {
         let (d, pp) = rle::read::<u16>(&b[p..], hdr.pitch)?;

         p += pp;

         for &cr in &d {
            im.cr.push(r5g5b5_to_rgb8(cr));
         }
      }

      Ok(im)
   } else {
      bail!("invalid configuration")
   }
}

// EOF