Re: Converting a webkit plugin to NPAPI?

On Aug 18, 7:20 am, Stuart Morgan <[email protected]> wrote:
> You have two options, each of which is pretty easy if that's actually
> the only thing you are doing:
> - Use the CoreGraphics drawing model: call NPN_InvalidateRect each
> time you have a new frame, then in the paint callback draw your
> NSImage to the CGContextRef you are given as an argument.
> - Use the Core Animation drawing model: Convert your bitmap to a
> CGImageRef instead of an NSImage, and set it as the content property
> of the CALayer you vend.
>
> If you handle events, have other controls in your view, etc. then
> you'll have more work to do.
>
> -Stuart

Thank you.  I made some progress going down the CoreGraphics path.
When I
try to add a second instance on the same page things seem to fall
apart.  The
NPAPI documentation as I read it states that the "window" attribute of
the NPWindow
structure will point to an NP_Port structure for OS X.  I am seeing
the window attribute
as NULL.

I'm trying to understand where the correct x/y attributes are found
for passing into an
NSRect create method.  The documents are slightly confusing here.

If I use the X/Y coordinates that are in the NPWindow structure this
works fine for the
div at 0,0 but a div that would be placed directly below the top most
div doesn't draw
where I expect it to.  The coordinates given to me are, for example,
0, 400.  Now this
to me implies that drawing is relative to the entire page and not a
400x400 div area.
Creating a NSRect with a Y of 400 causes the image to be drawn
offscreen.  If I
change the value to always be 0 based then the image is drawn in the
correct location
within the div (rectangle).  The same goes for the X coordinates if I
place a div
adjacent using a "display: inline-block" attribute on the div.

Am I supposed to be able to get / use the NP_Port structure for laying
things out on
OS X?  I need to be able to have this plugin draw videos into a grid
of rectangles.

Can someone shed some light on this?  Also, the NP_Port structure is
"ifdef'd" out
by default. I have to build my plug-in as 32 bit due to restrictions
imposed on me
by the vendor supplying the NVR library. I noticed that XP_MACOSX
needs to
be defined in order for the NP_Port structure to be visible.  This did
nothing for
me other than to get rid of compile errors.