c# - Applying masks to bitmap image in UWP App -

i have opened image in app , getting pixels data of image using following piece of code.

  using (irandomaccessstream filestreams = await file.openasync(windows.storage.fileaccessmode.read))             {                 bitmapdecoder decoder = await bitmapdecoder.createasync(filestreams);                 bitmaptransform transform = new bitmaptransform()                 {                     scaledwidth = convert.touint32(bitmapimage.pixelwidth),                     scaledheight = convert.touint32(bitmapimage.pixelheight)                 };                 pixeldataprovider pixeldata = await decoder.getpixeldataasync(                     bitmappixelformat.bgra8,                     bitmapalphamode.straight,                     transform,                     exiforientationmode.ignoreexiforientation,                     colormanagementmode.donotcolormanage                );                  byte[] sourcepixels = pixeldata.detachpixeldata();                             } 

here have got array of pixels of image. total number of pixels in array (width * height * 4). after analyzing array came know index numbers 0, 1, 2 , 3 contains red, green blue , alpha values of first pixel, index numbers 4, 5, 6 , 7 contains red, green, blue , alpha values of second pixel of image , on.

now want apply 3x3 filter image, how can 1-d array? know how if have 2-d array of image.

right now, have 1 idea in mind.

1. store red pixels in 1 2d array, green in other , on
2. apply filter on each 2d array.
3. combine of these make 1-d array again , return result.

is solution? me if there better solution it.