Converting a PicHandle to format for use with imageData

Dar Scott dsc at swcp.com
Mon Dec 29 14:57:15 CST 2003


On Monday, December 29, 2003, at 12:30 PM, Trevor DeVore wrote:

> This is fairly new territory for me so I'm not quite sure how you  
> would copy the PixMap of the GWorld to the imageData of the image  
> object.

I'm no expert either.

Here is the PixMap data:

     
http://developer.apple.com/documentation/QuickTime/APIREF/SOURCESIV/ 
pixmap.htm#//apple_ref/c/tag/PixMap

I would guess you would use that info to calculate the rectangle  
property and that & the associated bitmap (and maybe color table) to  
calculate the imageData property of the image.  (I'm guessing that  
maskData and alphaData would not need to be set.)

The imageData is described in the Transcript Dictionary.


However...  I have used 'export snapshot' to put a snapshot into a  
variable as PNG and then stuffed that value into the text property of  
an image.  I don't know if the value put into the variable is exactly  
PNG, but I suspect it might be.  It might be that PNG is the only type  
that the text property can be set to, but I think it worth trying  
others such as JPEG.  So, if you can create a ram image of some file  
format, your external might return that and maybe that will work as the  
text property of an image.  The experimenting might be worth it if the  
above conversion is to be avoided.

(Caveat:  Some of my image code broke in a recent Rev version.  I'm not  
sure if it is export snapshot, buffering properties, lock/unlock screen  
or what, so watch out.)


Hmmm.  Can you move to that frame and then export snapshot?  Or is that  
too ugly?

Dar Scott





More information about the use-livecode mailing list