On 2/3/07, Tom Gregorovic <[EMAIL PROTECTED]> 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
- unable to implement GetPixel, FloodFill, SetPixel must be simulated
via line drawing
- different coordination system (change Current Transformation Matrix)
- bledning instead of ROP
- bitmap canvas implementation (needs Mac OS X v10.4 because of
CGBitmapContextCreateImage, but we can get round it)
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.
Hi,
although I am not a lazarus developer myself, I dare to to add my two
cents here...
I fully agree with Tom. Quartz 2D is the ONLY future compatible mac
way in the moment. For the non-mac people, the problem is follows: You
don't have direct access to pixels in Quartz anymore, just floating
point coordinates. As I understand some of the canvas methods require
pixel access.
I have not really thought of this all the way through, but maybe it
would be simple to have an offscreen bitmap graphic which acts as
canvas and use Quartz 2D to map it to the screen. In this way one
would really have pixels to manipulate.
Best wishes,
Ingolf
Regards,
Tom Gregorovic
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Ingolf Schaefer
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