Hello all, I have to blur an image and I have implemented my own blur
algorithm (gaussian), but it is too slow (I guess it is due to the
emulator and the interpreted nature of the Dalvik VM).
I have found the class android.graphics.BlurMaskFilter but I haven't
been able to apply it successfully to an image (Bitmap).
If I try something like:
Paint blurPaint = new Paint();
blurPaint.setFilterBitmap(true);
blurPaint.setMaskFilter(new BlurMaskFilter(radius,
BlurMaskFilter.Blur.NORMAL));
Bitmap blurred = Bitmap.createBitmap(800, 600,
Bitmap.Config.RGB_565);
Canvas c = new Canvas(blurred);
c.drawBitmap(originalBitmap, 0, 0, blurPaint);
nothing happens (well, the borders of the image appear with shade,
with seems normal, according to "Note: if the paint contains a
maskfilter that generates a mask which extends beyond the bitmap's
original width/height (e.g. BlurMaskFilter), then the bitmap will be
drawn as if it were in a Shader with CLAMP mode. "
But the image is not blurred!!
I have tried a different approach passing the image to grey scale, the
grey to the alpha channel (because there is only a extractAlpha()
method that takes a Paint) and then:
Bitmap blurredBitmap = bm.extractAlpha(blurPaint, new int[] {0, 0});
But it makes the VM crash!! (seems like a bug inside the
extractAlpha() method, because extractAlpha() without params also
crash). It crashes when I use Bitmap.Config.ARGB_8888 or
Bitmap.Config.ARGB_4444, but not if I use Bitmap.Config.RGB_565, but
then obviously I lose the alpha information and the resulting bitmap
is all black.
Could anybody please provide a working example of blurring an image?
Thanks in advance,
Jose Luis.
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