Time for an 2014 update…

Task/Bitmap-Write-a-PPM-file/Rust/bitmap-write-a-ppm-file.rust

@@ -0,0 +1,70 @@
+use std::vec::from_elem;
+use std::path::posix::{Path};
+use std::io::File;
+
+pub struct RGB {
+  r: u8
+ ,g: u8
+ ,b: u8
+}
+
+pub struct PPM {
+  height: uint
+ ,width: uint
+ ,data: ~[u8]
+}
+
+impl PPM {
+  pub fn new(height: uint, width: uint) -> PPM {
+    let size = 3 * height * width;
+    let buffer = from_elem(size, 0u8);
+    PPM{height: height, width: width, data: buffer}
+  }
+
+  fn buffer_size(&self) -> uint {
+    3 * self.height * self.width
+  }
+
+  fn get_offset(&self, x: uint, y: uint) -> Option<uint> {
+    let offset = (y * self.width * 3) + (x * 3);
+    if(offset < self.buffer_size()){
+      Some(offset)
+    }else{
+      None
+    }
+  }
+
+  pub fn get_pixel(&self, x: uint, y: uint) -> Option<RGB> {
+    match self.get_offset(x, y) {
+      Some(offset) => {
+        let r = self.data[offset];
+        let g = self.data[offset + 1];
+        let b = self.data[offset + 2];
+        Some(RGB{r, g, b})
+      },
+      None => None
+    }
+  }
+
+  pub fn set_pixel(&mut self, x: uint, y: uint, color: RGB) -> bool {
+    match self.get_offset(x, y) {
+      Some(offset) => {
+        self.data[offset] = color.r;
+        self.data[offset + 1] = color.g;
+        self.data[offset + 2] = color.b;
+        true
+      },
+      None => false
+    }
+  }
+
+  pub fn write_file(&self, filename: &str) -> bool {
+    let path = Path::new(filename);
+    let mut file = File::create(&path);
+    let header = format!("P6 {} {} 255\n", self.width, self.height);
+    file.write(header.as_bytes());
+    file.write(self.data);
+    true
+  }
+
+}