Re: [Devel] extending FT_Stream to handle moveable memory

[David Turner]

Hi Graham,

Graham Asher wrote:
> As part of my work for Artifex, Inc., to connect FreeType with GhostScript I
> am going to extend FT_Stream so that it can handle blocks of memory that can
> move around between calls to FreeType functions. GhostScript stores TrueType
> font file images in moveable memory. These changes will enable FT_Open_Face,
> which takes an FT_Stream object as one of its arguments, to handle such
> fonts.
>
> Please let me know if there is already a way of doing this, which I very
> much doubt. I am aware that I could implement this in a much more cumbersome
> way using a special FT_StreamRec_::read function, but I don't want to pay
> the performance cost of allocating and freeing heap memory when I could
> easily get a pointer to the actual memory.
>
> You'll be pleased to know that the changes will be minimal and should have
> no impact on performance.

Thanks, w're looking forwards to seeing your implementation. By the way,
do you plan to support "movable" "extracted frames" ? This would probably
require a few changes to the engine itself (not just the stream
implementation and their macros), but I'd like to let you know that I'm
ready to perform these if you need them...

Best Regards,

- David Turner
- The FreeType Project  (www.freetype.org)