//! QuickDraw PICT RGB8 `PixMap`s.

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

/// Reads a RGB8 `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 ||
      hdr.pack_t == pm::head::PackType::NoPad
   {
      // uncompressed RGB8 or XRGB8
      for _ in 0..im.h() {
         for _ in 0..im.w() {
            if hdr.pack_t != pm::head::PackType::NoPad {
               p += 1;
            }

            read_data! {
               endian: BIG, buf: b, size: 3, start: p, data {
                  let r = u8[0];
                  let g = u8[1];
                  let b = u8[2];
               }
            }

            im.cr.push(Color8::new(r, g, b));

            p += 3;
         }
      }

      Ok(im)
   } else if hdr.rle {
      // RLE compressed RGB8
      let pitch = hdr.pitch - im.w(); // remove padding byte from pitch
      for _ in 0..im.h() {
         let (d, pp) = rle::read::<u8>(&b[p..], pitch)?;

         p += pp;

         for x in 0..im.w() {
            let r = d[x + im.w()];
            let g = d[x + im.w() * 2];
            let b = d[x + im.w() * 3];
            im.cr.push(Color8::new(r, g, b));
         }
      }

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

// EOF