Revision 464e53fa
Added by Leszek Koltunski almost 8 years ago
| src/main/java/org/distorted/library/EffectQueuePostprocess.java | ||
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| 93 | 93 |
// Support blurs consisting of the present pixel and up to MAX_BLUR pixels in each direction |
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private static final int MAX_BLUR = 50; |
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// The (linearly-sampled) Gaussian Blur kernels are of the size k0=1, k1=2, k2=2, k3=3, k4=3, k5=4, k6=4,...
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// The (fixed-function-sampled) Gaussian Blur kernels are of the size k0=1, k1=2, k2=2, k3=3, k4=3, k5=4, k6=4,...
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// i.e. k(i)=floor((i+3)/2). (the 'i' in k(i) means 'blur taking into account the present pixel and 'i' pixels |
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// in all 4 directions) |
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// We need room for MAX_BLUR of them, and sum(i=0...N, floor((i+3)/2)) = N + floor(N*N/4) |
| ... | ... | |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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// This implements the 'Better separable implementation using GPU fixed function sampling' from |
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// https://software.intel.com/en-us/blogs/2014/07/15/an-investigation-of-fast-real-time-gpu-based-image-blur-algorithms |
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private void computeGaussianKernel(int radius) |
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{
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| ... | ... | |
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for(int i=0; i<=radius; i++) mWeights[i] /= sum; |
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// squash the weights and offsets for linear sampling |
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int numloops = radius/2; |
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weightsCache[offset] = mWeights[0]; |
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offsetsCache[offset] = 0.0f; |
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| ... | ... | |
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offsetsCache[index]=mOffsets[radius]; |
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weightsCache[index]=mWeights[radius]; |
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} |
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android.util.Log.e("post", "computed kernel size "+radius+" put it into cache="+offset);
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} |
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} |
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Also available in: Unified diff
Beginnings of the 'Multiblur' app.