Tom Gregorovic wrote:
Hi,
I think over how to implement canvas for Carbon interface.
There are two possibilities to use: QuickDraw or Quartz 2D. I want to
consult it with you.
Here is the list of disadvantages, I have found:
QuickDraw
- DC of Carbon controls must use Window Port
- deprecated in Mac OS X v10.4
Quartz 2D
From the start (or short after) it has been my idea to use this. IMO it
is more close to how the LCL handle things. IIRC per view/widget insted
of a global canvas with a global paint.
We are already creating windows in compositing mode.
- unable to implement GetPixel, FloodFill, SetPixel must be simulated
via line drawing
A pixel is just a very short line. In most cases we're not drawin
directly to a view, so we can get the pixel for our buffer. I think it
is possible to have floodfills.
- different coordination system (change Current Transformation Matrix)
:) I've been experimenting with that, the first result was that
everything was upsidedown. However you can easalil map between
coordinate systems
- bledning instead of ROP
:)
- bitmap canvas implementation (needs Mac OS X v10.4 because of
CGBitmapContextCreateImage, but we can get round it)
IIRC the current requirement was 10.3, however that was when I looked
the last time. IIRC for some controls we already need 10.4
Feel free to point out anything I have omitted.
From my point of view the Quartz 2D appears to be more suitable,
although it doesn't provide per-pixel operations.
I do think that that can be solved somehow (should be).
Marc
_________________________________________________________________
To unsubscribe: mail [EMAIL PROTECTED] with
"unsubscribe" as the Subject
archives at http://www.lazarus.freepascal.org/mailarchives
