Let's work on this today and see what we get. I've got meetings for the next 3
hours, but am free to try and help after that.
Feel free to email me in 3 hours.
Cool?
- Alex Zavatone
On Feb 10, 2012, at 11:15 AM, Chris Paveglio wrote:
> What I'm working with is a library that makes a QR code. It was built for iOS
> but I need desktop OSX (which, on a side note, seems silly because when you
> MAKE a qr code, you'd usually want to print it right? Otherwise phones would
> just read them. Anyways...). It was easy enough to adjust the library to
> product an NSImage instead of UIImage. It's giving me an RGBa image (which is
> already BW, so I don't need to quantize... nor would I know how, that is way
> out of my league of skills I think). I don't want to fiddle around with the
> library so much because I'm afraid I will break it, and some of it's C++ and
> straight C. It would be great if it could output an greyscale image at least,
> instead of RBGa. But right now it doesn't so I will deal with the RGBa, and
> all channels are equal so I could use any.
> My C skills aren't so great, and I feel like if I can't make it all work
> properly, I wouldn't know if I had -any- of it working properly.
>
> After a while of studying and trying some things, here's what I've got so
> far. I know it's not correct and doesn't work yet.
>
> -(NSData *)oneBitData:(NSImage *)inputNSImage
> {
> NSData *testOnly = [NSData data];
> //this will be somewhat akin to un-reading the qrEncoder +renderDataMatrix
> method
> //I need to get 1 channel of the RGBa only here
> //or, change the library to return a greyscale image
> //output a 1 bit image of NSData format from an NSImage given in RGB mode
> //get an image rep from the current qrImage
> NSBitmapImageRep*imgRep = [NSBitmapImageRepimageRepWithData:[inputNSImage
> TIFFRepresentation]];
> int
> row, column,
> widthInPixels = [imgRep pixelsWide],
> heightInPixels = [imgRep pixelsHigh];
> //make a buffer of bits, like 50px x 50px = 2500 chars
> const int rawDataSize = widthInPixels * heightInPixels;
> unsigned char *rawData = (unsigned char*)malloc(rawDataSize);
> NSUInteger lePixel;
> for (row = 0; row < heightInPixels; row++)
> for (column = 0; column <widthInPixels; column++)
> {
> [imgRep getPixel:&lePixel atX:row y:column];
> //copy the value from first memory area to the same
> //location in the raw data area, it'll be either B or W, no inbetween values
> NSLog(@"bit %d = %d", (row * column) , lePixel);
> rawData[row * column] = lePixel < 128 ? 0 : 255;
> }
> return testOnly;
> }
>
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
