[Oberon] FPGA - Pictures.Mod composition

[Bob Walkden]

A bitmap represents a picture. There are many other possible representations of the same picture .

> On 26 Sep 2017, at 19:25, Tomas Kral <thomas.kral at email.cz> wrote:
> 
> Hi,
> 
> Looking at these two structures, I am scratching my head, is a
> picture `kind of' bitmap, or `makes use of' bitmap, as we repeat
> fields: width, height, depth, and base, while only adding colour table?
> 
> TYPE
>  Bitmap* = POINTER TO BitmapDesc;
>  BitmapDesc* = RECORD
>    width*, height*, depth*: INTEGER;
>    base*: INTEGER;
>    size*: INTEGER
>  END;
> 
> TYPE
> Picture* = POINTER TO PictureDesc;
>    PictureDesc* = RECORD
>      width*, height*, depth*: INTEGER;
>      bitmap: Bitmaps.Bitmap;
>      base: INTEGER;
>      ct: ColorTable
>    END;
> 
> Should we not just extend it?
> 
> TYPE
> PictureDesc* = RECORD (Bitmaps)
>     ct: ColorTable
>   END;
> 
> -- 
> Tomas Kral <thomas.kral at email.cz>
> --
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