use image crate for tiles instead of custom type

src/bin/tileview.rs

@@ -22,11 +22,9 @@ fn main() {
   let mut ega_vec = Vec::<u8>::new();
 
   file.read_to_end(&mut ega_vec).expect("Read EGA file");
-  let ega_page = ega::decode(&ega_vec, Compression::UNCOMPRESSED, Tiling::TILED(16));
-  for (i, tilepixels) in ega_page.iter().enumerate() {
+  let tiles = ega::decode(&ega_vec, Compression::UNCOMPRESSED, Tiling::TILED(16));
+  for (i, tile) in tiles.iter().enumerate() {
     let out_name = format!("out/{}.png", i);
-    let out_file = std::fs::File::create(Path::new(&out_name)).expect("open out file");
-    let enc = image::png::PNGEncoder::new(out_file);
-    enc.encode(&tilepixels, 16, 16, image::ColorType::RGBA(8)).expect("write png");
+    tile.save(out_name).expect("save png");
   }
 }

src/ega.rs

@@ -1,3 +1,7 @@
+extern crate image;
+
+use self::image::{ImageBuffer, Rgba};
+
 static EGA_PALETTE: [[u8; 4]; 16] = [[0x00, 0x00, 0x00, 0x00],
                                      [0x00, 0x00, 0xAA, 0x00],
                                      [0x00, 0xAA, 0x00, 0x00],
@@ -23,39 +27,30 @@ pub enum Compression {
 
 pub enum Tiling {
   UNTILED,
-  TILED(u16)
-}
-
-pub struct EgaPage {
-  pub data: Vec<u8>,
-  pub tilesize: u16,
-}
-
-impl EgaPage {
-  pub fn iter<'a>(&'a self) -> impl Iterator<Item=&'a [u8]> {
-    self.data.chunks(self.tilesize as usize)
-  }
+  TILED(u32)
 }
 
 pub fn decode<'a>(buf: &[u8], compression: Compression, tiling: Tiling)
-                  -> EgaPage {
-  let out: Vec<u8>;
-
-  out = match compression {
-    Compression::UNCOMPRESSED => buf.iter()
-                                    .flat_map(|tile_byte| {
-                                      EGA_PALETTE[(tile_byte >> 4u8 & 0xF) as usize]
-                                        .into_iter()
-                                        .chain(EGA_PALETTE[(tile_byte & 0xF) as usize]
-                                               .into_iter())
-                                    })
-                                    .map(|x| *x)
-                                    .collect(),
+                  -> Vec<ImageBuffer<Rgba<u8>, Vec<u8>>> {
+  let (tiledim, iter) = match tiling {
+    Tiling::TILED(tiledim) => (tiledim, buf.chunks((tiledim * tiledim / 2) as usize)),
+    Tiling::UNTILED => (buf.len() as u32, buf.chunks(buf.len()))
+  };
+  match compression {
+    Compression::UNCOMPRESSED =>
+      iter.map(|chunk| {
+        ImageBuffer::from_raw(tiledim,
+                              tiledim,
+                              chunk.into_iter()
+                                   .flat_map(|tile_byte| {
+                                     EGA_PALETTE[(tile_byte >> 4u8 & 0xF) as usize]
+                                      .into_iter()
+                                      .chain(EGA_PALETTE[(tile_byte & 0xF) as usize]
+                                             .into_iter())
+                                   }).map(|x| *x)
+                                   .collect())
+          .expect("decode ega")
+      }).collect(),
     _ => unimplemented!()
-  };
-  let tilesize = match tiling {
-    Tiling::TILED(tiledim) => 4 * tiledim * tiledim,
-    Tiling::UNTILED => out.len() as u16
-  };
-  EgaPage { data: out, tilesize: tilesize}
+  }
 }

src/tile.rs

@@ -14,8 +14,7 @@ pub struct Tile {
   pub val: u8,
 }
 
-pub fn get_tiles<R, F, T>(factory: &mut F) -> (//gfx::handle::Texture<R, T::Surface>,
-                                               gfx::handle::ShaderResourceView<R, T::View>)
+pub fn get_tiles<R, F, T>(factory: &mut F) -> gfx::handle::ShaderResourceView<R, T::View>
   where R: gfx::Resources,
         F: gfx::Factory<R>,
         T: gfx::format::TextureFormat {
@@ -24,11 +23,11 @@ pub fn get_tiles<R, F, T>(factory: &mut F) -> (//gfx::handle::Texture<R, T::Surf
     .expect(&format!("failed opening tiles file: {}", filename));
   let mut ega_bytes = Vec::new();
   file.read_to_end(&mut ega_bytes).expect("Read tiles file");
-  let ega_page = ega::decode(&ega_bytes, ega::Compression::UNCOMPRESSED, ega::Tiling::TILED(16));
-  let tiles: Vec<&[u8]> = ega_page.iter().collect();
+  let tiles = ega::decode(&ega_bytes, ega::Compression::UNCOMPRESSED, ega::Tiling::TILED(16));
+  let tiles_raw: Vec<&[u8]> = tiles.iter().map(|t| &*t as &[u8]).collect();
   let tex = factory.create_texture_const_u8::<T>(tex::Kind::D2Array(16, 16, 256,
                                                                     tex::AaMode::Single),
-                                                 &tiles)
+                                                 &tiles_raw)
                    .expect("create tile texture");
   tex.1
 }