Re: NSImage -- getting raw bitmap data
Re: NSImage -- getting raw bitmap data
- Subject: Re: NSImage -- getting raw bitmap data
- From: "M. Uli Kusterer" <email@hidden>
- Date: Sun, 3 Aug 2003 14:49:13 +0200
At 10:32 Uhr -0700 02.08.2003, Dennis C.De Mars wrote:
NSData* tiffData = [theImage TIFFRepresentation];
NSBitmapImageRep* bitMapRep = [NSBitmapImageRep imageRepWithData:tiffData];
ThanksA At worst this and bitmapData should let me do the conversion
manually, like the IconFamily package seems to do it (didn't think
about checking that before).
NSImageRep has some interesting methods for setting these parameters
but I don't know if using them on a bitmap rep will cause any kind
of conversion to take place. You could experiment.
No, according to the docs, these accessors are solely for providing
information about the data, but they perform no conversion :-(
I guess I would have tried to do it the way you tried (drawing the
image into a preformed bitmapimagerep). Don't know why that didn't
work, but if you could post some code maybe we could suggest
modifications.
OK, here goes. I create the NSBitmapImageRep:
unsigned char* planes[1] = { 0 };
NSBitmapImageRep* bir;
planes[0] = (char*) [myData bytes]; // myData = member var.
bir = [[[NSBitmapImageRep alloc] autorelease]
initWithBitmapDataPlanes:planes
pixelsWide:32 pixelsHigh:32 bitsPerSample:1 samplesPerPixel:1
hasAlpha:NO isPlanar:NO
colorSpaceName:NSCalibratedBlackColorSpace
bytesPerRow:4 bitsPerPixel:1];
[myImage addRepresentation:bir]; // myImage = member var
[imageView setImage: myImage]; // imageView = IBOutlet
That works just fine and displays my Bitmap. And then I try to draw into it in:
-(IBAction) imageViewChanged: (id)sender
{
NSArray* reps = [myImage representations];
NSLog( @"# %d", [reps count] ); // This prints "# 1".
[myImage lockFocusOnRepresentation: [reps objectAtIndex:0]];
[[imageView image] dissolveToPoint: NSMakePoint(0,0) fraction:1];
[myImage unlockFocus];
[imageView setImage: myImage];
}
And this is where it gets weird: It draws a *color* image on top of
my B/W image, and it doesn't change my image data one bit. So I guess
it replaces my representation with another??
--
Cheers,
M. Uli Kusterer
------------------------------------------------------------
"The Witnesses of TeachText are everywhere..."
http://www.zathras.de
_______________________________________________
cocoa-dev mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/cocoa-dev
Do not post admin requests to the list. They will be ignored.