some android image filters

in some filter, I use NDK to implement to make it more efficient

• Install Android NDK and properly configure it: http://goo.gl/koTCb
• Get a clean clone of this project, import the library in Android Studio
• then Clean and Build the hold project to regenerate the library
• Then just add library module as a dependency to your existing project.

It is dead simple, you can see magic in the following code:

  Bitmap newBitmap = BitmapFilter.changeStyle(originBitmap, BitmapFilter.BLUR_STYLE);
  imageView.setImageBitmap(newBitmap);        

and there are some options for the filter, you can go to see the demo to see how to use this options to customize your filter effect

You can see all filters in file BitmapFilter.java, currently contains totally 19 kinds of filters now, here is the list of filters and their options(show by code):

• Grayscale

• Relief

• Blur(Average Smooth)

   BitmapFilter.changeStyle(originBitmap, BitmapFilter.BLUR_STYLE, maskSize);

maskSize is a integer, to indicate the average blur mask's size

• Oil Painting

• Neon

   BitmapFilter.changeStyle(originBitmap, BitmapFilter.NEON_STYLE, 
   neon_color_R, neon_color_G, neon_color_B);	

neon_color_R, neon_color_G, neon_color_B are the R,G,B component are integer

• Pixelate

   BitmapFilter.changeStyle(originBitmap, BitmapFilter.PIXELATE_STYLE, pixelSize);

pixelSize is a integer, the pixel size for this filter

• Old TV

• Invert Color

• Block

• Old Photo

• Sharpen(By Laplacian)

• Light

   BitmapFilter.changeStyle(originBitmap, BitmapFilter.LIGHT_STYLE, light_center_x, light_center_y, light_radius);

light_center_x, light_center_y are integer, indicate the center of the light spot, the origin in the left-upper side, and the light_radius is indicate the radius of light spot, in pixel

• Lomo

   BitmapFilter.changeStyle(originBitmap, BitmapFilter.LOMO_STYLE, roundRadius);

roundRadius is a double, the black round's radius in the effect

• HDR

• Gaussian Blur

   BitmapFilter.changeStyle(originBitmap, BitmapFilter.GAUSSIAN_BLUR_STYLE, sigma);

  sigma is a double, the sigma value in Gaussian Blur, the bigger of sigma, the smoother in the result image

• Soft Glow

   BitmapFilter.changeStyle(originBitmap, BitmapFilter.SOFT_GLOW_STYLE, sigma);

  sigma is a double, the same as sigma in Gaussian Blur, indicate the sigma value in the process of Gaussian Blur for Soft Glow

• Sketch

• Motion Blur

   BitmapFilter.changeStyle(originBitmap, BitmapFilter.SOFT_GLOW_STYLE, xSpeed, ySpeed);

  xSpeed and ySpeed are both integer, indicate the speed in x-axis and y-axis, the origin in the left-upper side

• Gotham

PS: all options have defalut values, so you can just select the effect and pass nothing, like this:

BitmapFilter.changeStyle(originBitmap, BitmapFilter.MOTION_BLUR_STYLE);

If you have any question, please open an issue and show your code and the program ouput, thanks!

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