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Task/Bitmap/Nim/bitmap.nim

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+{.experimental.}
+
+import unsigned
+
+type
+  Luminance = uint8
+  Index = int
+
+  Pixel = tuple
+    r, g, b: Luminance
+
+  Image = object
+    w, h: Index
+    pixels: seq[Pixel]
+
+  Point = tuple
+    x, y: Index
+
+proc px(r, g, b): Pixel =
+  result.r = r.uint8
+  result.g = g.uint8
+  result.b = b.uint8
+
+proc img(w, h: int): Image =
+  result.w = w
+  result.h = h
+  result.pixels.newSeq(w * h)
+
+const
+  Black = px(  0,   0,   0)
+  White = px(255, 255, 255)
+
+iterator indices(img: Image): tuple[x, y: int] =
+  for x in 0 .. < img.w:
+    for y in 0 .. < img.h:
+      yield (x,y)
+
+proc `[]`(img: Image, x, y: int): Pixel =
+  img.pixels[y * img.w + x]
+
+proc `[]=`(img: var Image, x, y: int, c: Pixel) =
+  img.pixels[y * img.w + x] = c
+
+proc fill(img: var Image, color: Pixel) =
+  for x,y in img.indices:
+    img[x,y] = color
+
+proc print(img: Image) =
+  using stdout
+  for x,y in img.indices:
+    if img[x,y] == White:
+      write ' '
+    else:
+      write 'H'
+    write "\n"
+
+when isMainModule:
+  var x = img(64, 64)
+  x.fill px(255,255,255)
+  x[1,2] = px(255, 0, 0)
+  x[3,4] = x[1,2]