| java.lang.Object | ||
| ↳ | com.facebook.imagepipeline.request.BasePostprocessor | |
| ↳ | com.facebook.imagepipeline.postprocessors.BlurPostProcessor | |
Class Overview
A java implementation of a blur post processor. This provide two different blurring algorithm, one Gaussian blur using ScriptIntrinsicBlur for Android version >= 4.2 and the other one is an in-place iterative box blur algorithm that runs faster than a traditional box blur.
Summary
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Inherited Fields | |||||||||||
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 From class
com.facebook.imagepipeline.request.BasePostprocessor
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BlurPostProcessor(int blurRadius, Context context, int iterations)
Creates an instance of
BlurPostProcessor. | |||||||||||
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BlurPostProcessor(int blurRadius, Context context)
Creates an instance of
BlurPostProcessor. | |||||||||||
| Public Methods | |||||||||||
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| CacheKey |
getPostprocessorCacheKey()
The default implementation of the CacheKey for a Postprocessor is null
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| void |
process(Bitmap destBitmap, Bitmap sourceBitmap)
Clients should override this method if the post-processing cannot be done in place.
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| void |
process(Bitmap bitmap)
Clients should override this method if the post-processing can be done in place.
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Inherited Methods | |||||||||||
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From class
com.facebook.imagepipeline.request.BasePostprocessor
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From class
java.lang.Object
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From interface
com.facebook.imagepipeline.request.Postprocessor
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Public Constructors
public BlurPostProcessor (int blurRadius, Context context, int iterations)
Creates an instance of BlurPostProcessor.
Parameters
| blurRadius | The radius of the blur in range 0 < radius <= BLUR_MAX_RADIUS. |
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| context | A valid Context. |
| iterations | The number of iterations of the blurring algorithm > 0. |
public BlurPostProcessor (int blurRadius, Context context)
Creates an instance of BlurPostProcessor.
Parameters
| blurRadius | The radius of the blur in range 0 < radius <= BLUR_MAX_RADIUS. |
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| context | A valid Context. |
Public Methods
public CacheKey getPostprocessorCacheKey ()
The default implementation of the CacheKey for a Postprocessor is null
Returns
- The CacheKey to use for caching. Not used if null
public void process (Bitmap destBitmap, Bitmap sourceBitmap)
Clients should override this method if the post-processing cannot be done in place. If the
post-processing can be done in place, clients should override the process(Bitmap)
method.
The provided destination bitmap is of the same size as the source bitmap. There are no guarantees on the initial content of the destination bitmap, so the implementation has to make sure that it properly populates it.
The source bitmap must not be modified as it may be shared by the other clients. The implementation must use the provided destination bitmap as its output.
Parameters
| destBitmap | the destination bitmap to be used as output |
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| sourceBitmap | the source bitmap to be used as input |
public void process (Bitmap bitmap)
Clients should override this method if the post-processing can be done in place.
The provided bitmap is a copy of the source bitmap and the implementation is free to modify it.
Parameters
| bitmap | the bitmap to be used both as input and as output |
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