| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "ip.rsh" |
| #pragma rs_fp_relaxed |
| |
| rs_allocation gBlur; |
| |
| static float gOverWm1; |
| static float gOverHm1; |
| static uchar gLutR[256]; |
| static uchar gLutG[256]; |
| static uchar gLutB[256]; |
| |
| void setup() { |
| int w = rsAllocationGetDimX(gBlur); |
| int h = rsAllocationGetDimY(gBlur); |
| gOverWm1 = 1.f / w; |
| gOverHm1 = 1.f / h; |
| |
| for (int x=0; x < 256; x++) { |
| gLutR[x] = x;//255-x; |
| gLutG[x] = x;//255-x; |
| gLutB[x] = x;//255-x; |
| } |
| } |
| |
| uchar4 RS_KERNEL process(uchar4 in, uint32_t x, uint32_t y) { |
| float2 xyDist; |
| xyDist.x = (x * gOverWm1 - 0.5f); |
| xyDist.y = (y * gOverHm1 - 0.5f); |
| |
| // color |
| float4 v1 = rsUnpackColor8888(in); |
| float4 v2 = rsUnpackColor8888(rsGetElementAt_uchar4(gBlur, x, y)); |
| |
| float dist = dot(xyDist, xyDist) * 1.4f; |
| float pdist = native_powr(dist, 2.7f * 0.5f); |
| //float pdist = powr(dist, 2.7f * 0.5f); |
| |
| pdist = clamp(pdist, 0.f, 1.f); |
| v1 = mix(v1, v2, dist * 2.f); |
| v1 *= 1.f - pdist; |
| |
| // apply curve |
| uchar4 out = rsPackColorTo8888(v1); |
| |
| out.r = gLutR[out.r]; |
| out.g = gLutG[out.g]; |
| out.b = gLutB[out.b]; |
| return out; |
| } |
| |
| |