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/*
* 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.
*/
#pragma version(1)
#pragma rs java_package_name(com.android.rs.image)
#pragma rs_fp_relaxed
void genRand(uchar *out) {
*out = (uchar)rsRand(0xff);
}
/*
* Convolution matrix of distance 2 with fixed point of 'kShiftBits' bits
* shifted. Thus the sum of this matrix should be 'kShiftValue'. Entries of
* small values are not calculated to gain efficiency.
* The order ot pixels represented in this matrix is:
* 1 2 3
* 4 0 5
* 6 7 8
* and the matrix should be: {230, 56, 114, 56, 114, 114, 56, 114, 56}.
* However, since most of the valus are identical, we only use the first three
* entries and the entries corresponding to the pixels is:
* 1 2 1
* 2 0 2
* 1 2 1
*/
int32_t gWMask;
int32_t gHMask;
rs_allocation gBlendSource;
void blend9(uchar *out, uint32_t x, uint32_t y) {
uint32_t x1 = (x-1) & gWMask;
uint32_t x2 = (x+1) & gWMask;
uint32_t y1 = (y-1) & gHMask;
uint32_t y2 = (y+1) & gHMask;
uint p00 = 56 * rsGetElementAt_uchar(gBlendSource, x1, y1);
uint p01 = 114 * rsGetElementAt_uchar(gBlendSource, x, y1);
uint p02 = 56 * rsGetElementAt_uchar(gBlendSource, x2, y1);
uint p10 = 114 * rsGetElementAt_uchar(gBlendSource, x1, y);
uint p11 = 230 * rsGetElementAt_uchar(gBlendSource, x, y);
uint p12 = 114 * rsGetElementAt_uchar(gBlendSource, x2, y);
uint p20 = 56 * rsGetElementAt_uchar(gBlendSource, x1, y2);
uint p21 = 114 * rsGetElementAt_uchar(gBlendSource, x, y2);
uint p22 = 56 * rsGetElementAt_uchar(gBlendSource, x2, y2);
p00 += p01;
p02 += p10;
p11 += p12;
p20 += p21;
p22 += p00;
p02 += p11;
p20 += p22;
p20 += p02;
p20 = min(p20 >> 10, (uint)255);
*out = (uchar)p20;
}
float gNoiseStrength;
rs_allocation gNoise;
void root(const uchar4 *in, uchar4 *out, uint32_t x, uint32_t y) {
float4 ip = convert_float4(*in);
float pnoise = (float) rsGetElementAt_uchar(gNoise, x & gWMask, y & gHMask);
float energy_level = ip.r + ip.g + ip.b;
float energy_mask = (28.f - sqrt(energy_level)) * 0.03571f;
pnoise = (pnoise - 128.f) * energy_mask;
ip += pnoise * gNoiseStrength;
ip = clamp(ip, 0.f, 255.f);
uchar4 p = convert_uchar4(ip);
p.a = 0xff;
*out = p;
}
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