There are already utilties to convert between pixel (RGB) data and bmp
files. This works well with the gl2 abilitiy to read and write pixels.
See open'bmp'.
----- Original Message -----
From: "bill lam" <[EMAIL PROTECTED]>
To: "Beta forum" <[email protected]>
Sent: Friday, August 04, 2006 10:29 AM
Subject: Re: [Jbeta] glpixels
Oleg Kobchenko wrote:
Regarding both proposals for stretching and formats,
I think it would complicate things both for J implementation
and for users, while introducing artificial limits.
Stretch (in GDI terms) is a very primitive and outdated
operation. Nowadays, to say stretch is to
say too little, because there are many other factors like
smoothing or dithering method, what operation you want
with the replaced image (XOR, masked etc.), compositing
issues like transparency, etc. And it's better done in the code,
where you have full control.
Formats is too specialized area, which is best handled
by a separate format-reading library. The same is in
other graphics systems like GDI+ and Java: you create
a bitmap (loading from a format possibly), then the
bitmat is always a rectangle of pixels, and only bitmap
is applied to the screen.
To make it easier to use in the code a wrapper code
can be created with simple interface, like you suggest.
But it's important to maintain separation of
responsibilities between the gl2 engine and
the external stuff.
Thank you for information, I didn't realize bitblt family is outdated.
I'm not
an expert on graphic, I just want to display pictures in window
easily.
Isipicture is decommitted, and image addon not yet updated for J601,
there is no
simple way to display a bitmap picture file. My quick-and-dirt
solution is to
use owner-drawn button as an isipicture control. Hope this situation
will improve.
image addon has a limitation that file format cannot be converted in
memory. It
always requires writing to a file and then read that file again. This
is
inconvenient and has a problem of how to get a temporary file.
--
regards,
bill
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