Re: [pygame] pygame.scrap bitmap stuff

On 7/12/06, René Dudfield <renesd@xxxxxxxxx> wrote:

Sounds good!  Nice one.

Is libtiff linked to imageext on macosx?  If so, I think there is a
save as tiff function in there which I could add.

I think I could make it save to bmp in memory fairly easily.  I'll
need to change the save signature to take a name hint(like load does).

eg.
f = someStringIOclass()
surf.save(f, "bla.bmp")

On 7/13/06, Bob Ippolito < bob@xxxxxxxxxx> wrote:
> I went ahead and implemented (read: prototyped) scrap bitmap support
> for Mac OS X, but the implementation is terribly inefficient. Pygame
> surfaces aren't terribly accessible from Python outside of surfarray
> (which I didn't want to depend on).
>
> Going from a Surface to the pasteboard is particularly painful in
> this implementation:
>
> 1. Surface to PNG (on disk!)
> 2. NSImage from on-disk PNG
> 3. NSImage to TIFF
> 4. TIFF to pasteboard
>
> The absolute fastest route (which doesn't exist in pygame) would be:
>
> 1. Surface to TIFF (in memory)
> 2. TIFF to pasteboard
>
> pygame doesn't have any TIFF writing capability at all, a compromise
> here would to at least avoid hitting the disk and zlib:
>
> 1. Surface to BMP (in memory)
> 2. BMP to NSImage
> 3. NSImage to TIFF
> 4. TIFF to pasteboard
>
> Unfortunately this also isn't currently possible because pygame
> doesn't support BMP writing anymore (or so it seems from a quick look
> at the code) and it definitely won't do it to memory instead of disk.
> Cocoa does not support TGA.
>
> Going the other way is also gnarly, but mostly because I didn't want
> to think more than I had to:
>
> 1. pasteboard to NSImage
> 2. NSImage to TIFF
> 3. TIFF to NSBitmapImageRep
> 4. NSBitmapImageRep to BMP (in memory)
> 5. Surface from BMP
>
> Getting a NSBitmapImageRep directly from the NSImage (steps 2+3
> combined) is definitely possible without going between TIFF, but I
> was too lazy to think about what that would do for vector graphics
> (e.g. PDF on the pasteboard) and screen representations. It's not
> necessarily true that NSImage will have a NSBitmapImageRep cached
> already.
>
> Going from NSBitmapImageRep to a Surface without hitting BMP is
> possible, but there's a bunch of formats the NSBitmapImageRep could
> be in and I didn't want to think about that either :)
>
> In any case, pygame.scrap is 100% implemented on Mac OS X, and it's
> kinda fun to play with. An easy way to test is to take a partial
> screen cap to the pasteboard (shift-ctrl-cmd-4) and blit it in your
> pygame app. You should be able to bring in anything from the
> pasteboard that NSImage can load: icons, jpeg, png, pdf (!), tiff, etc.
>
> -bob
>
>