Fix convertion from Color to Pixel

src/canvas.rs

@@ -94,10 +94,15 @@ impl Canvas {
         unimplemented!();
     }
 
-    pub fn create_texture(&mut self, _size: Size, _background: Option<Pixel>)
+    pub fn create_texture(&mut self, size: Size, background: Option<Pixel>)
-        -> Rc<RefCell<Texture>>
+        -> Result<TextureHandle, &'static str>
     {
-        unimplemented!();
+       let buffer = vec!(background.unwrap_or_else(|| Pixel::from(Color::NONE));
+		   (size.w * size.h).try_into().unwrap());
+	   let texture = Texture::create(&self.renderer, &Vec::from(bytemuck::cast_slice(&buffer)),
+		   size);
+
+	   Ok(TextureHandle::from_texture(texture))
     }
 
     pub fn create_texture_from_file(&mut self,

src/renderer/texture.rs

@@ -17,6 +17,7 @@ pub struct Texture {
 
 impl Texture {
 
+	//TODO: take buffer's ownership
     pub fn create(renderer: &WgpuRenderer,
                   buffer: &[u8],
                   size: Size)

src/utils.rs

@@ -175,10 +175,10 @@ impl Color {
 		//that the values are within [0.0, 1.0], meaning we won't ever overflow an u8
 		unsafe {
 			Pixel {
-				r: self.r.to_int_unchecked::<u8>() * 255,
+				r: (self.r * 255.0).to_int_unchecked::<u8>(),
-				g: self.g.to_int_unchecked::<u8>() * 255,
+				g: (self.g * 255.0).to_int_unchecked::<u8>(),
-				b: self.b.to_int_unchecked::<u8>() * 255,
+				b: (self.b * 255.0).to_int_unchecked::<u8>(),
-				a: self.a.to_int_unchecked::<u8>() * 255,
+				a: (self.a * 255.0).to_int_unchecked::<u8>(),
 			}
 		}
 	}
@@ -193,7 +193,7 @@ impl Color {
 	}
 
     pub fn alpha_blend(&self, other: &Self) -> Self {
-		//apply alpha compisting's "over" operator, see
+		//apply alpha compositing's "over" operator, see
 		//[https://en.wikipedia.org/wiki/Alpha_compositing] for more detail
 		let a = self.a + other.a * (1.0 - self.a);
 		Self {