Re: [Pyobjc-dev] initWithBitmapDataPlanes?

[Francesco P. <fpi...@no...>]

Hi,

Thanks for the quick reply!

I actually saw the test scripts but when I tried using the function, I  
got a sgefault :-( (that is why I thought that the function had not  
really been wrapped)

What I do is the following:

img_size = str (len (self.img_data)) + 'B'
temp_data = struct.unpack (img_size, self.img_data)
data = array.array ('B')
for c in temp_data:
     data.append (c)
  del (temp_data)
my_bitmap =  
NSBitmapImageRep.alloc().initWithBitmapDataPlanes_pixelsWide_pixelsHigh_ 
bitsPerSample_samplesPerPixel_hasAlpha_isPlanar_colorSpaceName_bytesPerR 
ow_bitsPerPixel_ (
     (data, None, None, None, None),
     width,
     height,
     8,
     1,
     NO,
     YES,
     NSCalibratedWhiteColorSpace,
     width,
     8)
my_image = NSImage.alloc ().init ()
my_image.addRepresentation_ (my_bitmap)

# display the image in the GUI
self.server.controller.imgView.setImage_ (my_image)


Am I trashing the memory somewhere? I guess so, but have no idea  
where...


Cheers
fra


On Dec 6, 2003, at 12:03 AM, b.bum wrote:

> On Dec 5, 2003, at 10:40 PM, Francesco Pierfederici wrote:
>> The reason I am asking is that I am writing an application that  
>> receives a raster through a socket connection. The raster is a  
>> (potentially large) array of bytes that I would like to display as a  
>> grey-scale bitmap. Hence the need for NSBitmapImageRep and its  
>> initWithBitmapDataPlanes:...., unless, of course, there is a better  
>> way of doing displaying that data, other than using a  
>> NSBitmapImageRep!
>
> It is already partially mapped, but the assumption is that you have --  
> effectively -- five data planes worth of color information passed in  
> as a tuple.
>
> I believe that this means it will just work in your case -- you would  
> need to pass a tuple like (greyScaleBytes, None, None, None, None) in  
> as the first argument.
>
> See Modules/Appkit/_AppKitMapping_NSBitmap.m for the mapping code.  It  
> is incomplete.
>
> Better yet, see -- Lib/AppKit/test/test_nsbitmapimagerep.py -- as it  
> contains a set of unit tests that are passing and do pass bitmap data  
> across the bridge.
>
> So -- maybe -- Guido's time machine has been effective once again for  
> your particular use case. ;-)
>
> b.bum
---
Francesco Pierfederici         <fpi...@no...>
NOAO/AURA Inc.                http://www.noao.edu/staff/fpierfed/
950 N. Cherry Ave.              Phone: +1 520 318 8402
Tucson,  AZ 85719 USA       FAX:    +1 520 318 8360