| /* |
| * Copyright (C) 2014 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 "shared.rsh" |
| |
| int height; |
| int width; |
| static int radius; |
| rs_allocation ScratchPixel1; |
| rs_allocation ScratchPixel2; |
| |
| const int MAX_RADIUS = 25; |
| |
| // Store our coefficients here |
| static float gaussian[MAX_RADIUS * 2 + 1]; |
| |
| float4 __attribute__((kernel)) convert1_uToF(uchar v) { |
| float4 r = rsUnpackColor8888(v); |
| return r.r; |
| } |
| |
| float4 __attribute__((kernel)) convert4_uToF(uchar4 v) { |
| return rsUnpackColor8888(v); |
| } |
| |
| uchar __attribute__((kernel)) convert1_fToU(float4 v) { |
| uchar4 r = rsPackColorTo8888(v); |
| return r.r; |
| } |
| |
| uchar4 __attribute__((kernel)) convert4_fToU(float4 v) { |
| return rsPackColorTo8888(v); |
| } |
| |
| void setRadius(int rad) { |
| // This function is a duplicate of: |
| // RsdCpuScriptIntrinsicBlur::ComputeGaussianWeights() |
| // Which is the reference C implementation |
| radius = rad; |
| const float e = M_E; |
| const float pi = M_PI; |
| float sigma = 0.4f * (float)radius + 0.6f; |
| float coeff1 = 1.0f / (sqrt( 2.0f * pi ) * sigma); |
| float coeff2 = - 1.0f / (2.0f * sigma * sigma); |
| float normalizeFactor = 0.0f; |
| float floatR = 0.0f; |
| for (int r = -radius; r <= radius; r ++) { |
| floatR = (float)r; |
| gaussian[r + radius] = coeff1 * pow(e, floatR * floatR * coeff2); |
| normalizeFactor += gaussian[r + radius]; |
| } |
| |
| normalizeFactor = 1.0f / normalizeFactor; |
| for (int r = -radius; r <= radius; r ++) { |
| floatR = (float)r; |
| gaussian[r + radius] *= normalizeFactor; |
| } |
| } |
| |
| float4 __attribute__((kernel)) vert(uint32_t x, uint32_t y) { |
| float4 blurredPixel = 0; |
| int gi = 0; |
| for (int r = -radius; r <= radius; r ++) { |
| int validH = clamp((int)y + r, (int)0, (int)(height - 1)); |
| float4 i = rsGetElementAt_float4(ScratchPixel2, x, validH); |
| blurredPixel += i * gaussian[gi++]; |
| } |
| return blurredPixel; |
| } |
| |
| float4 __attribute__((kernel)) horz(uint32_t x, uint32_t y) { |
| float4 blurredPixel = 0; |
| int gi = 0; |
| for (int r = -radius; r <= radius; r ++) { |
| // Stepping left and right away from the pixel |
| int validX = clamp((int)x + r, (int)0, (int)(width - 1)); |
| float4 i = rsGetElementAt_float4(ScratchPixel1, validX, y); |
| blurredPixel += i * gaussian[gi++]; |
| } |
| return blurredPixel; |
| } |