Add film grain test.

/*

 * 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.

 */

package com.android.rs.image;

import java.lang.Math;

import android.renderscript.Allocation;

import android.renderscript.Element;

import android.renderscript.RenderScript;

import android.renderscript.Script;

import android.renderscript.ScriptC;

import android.renderscript.Type;

import android.util.Log;

import android.widget.SeekBar;

import android.widget.TextView;

public class Grain extends TestBase {

    private ScriptC_grain mScript;

    private Allocation mNoise;

    private Allocation mNoise2;

    public boolean onBar1Setup(SeekBar b, TextView t) {

        t.setText("Strength");

        b.setProgress(50);

        return true;

    }

    public void onBar1Changed(int progress) {

        float s = progress / 100.0f;

        mScript.set_gNoiseStrength(s);

    }

    public void createTest(android.content.res.Resources res) {

        int width = mInPixelsAllocation.getType().getX();

        int height = mInPixelsAllocation.getType().getY();

        Type.Builder tb = new Type.Builder(mRS, Element.U8(mRS));

        tb.setX(width);

        tb.setY(height);

        mNoise = Allocation.createTyped(mRS, tb.create());

        mNoise2 = Allocation.createTyped(mRS, tb.create());

        mScript = new ScriptC_grain(mRS, res, R.raw.grain);

        mScript.set_gWidth(width);

        mScript.set_gHeight(height);

        mScript.set_gNoiseStrength(0.5f);

        mScript.set_gBlendSource(mNoise);

        mScript.set_gNoise(mNoise2);

    }

    public void runTest() {

        mScript.forEach_genRand(mNoise);

        mScript.forEach_blend9(mNoise2);

        mScript.forEach_root(mInPixelsAllocation, mOutPixelsAllocation);

    }

}

        case 5:

            mTest = new Greyscale();

            break;

        case 6:

            mTest = new Grain();

            break;

        }

        mTest.createBaseTest(this, mBitmapIn);

    }

    void setupTests() {

        mTestNames = new String[6];

        mTestNames = new String[7];

        mTestNames[0] = "Levels Vec3 Relaxed";

        mTestNames[1] = "Levels Vec4 Relaxed";

        mTestNames[2] = "Levels Vec3 Full";

        mTestNames[3] = "Levels Vec4 Full";

        mTestNames[4] = "Blur radius 25";

        mTestNames[5] = "Greyscale";

        mTestNames[6] = "Grain";

        mTestSpinner.setAdapter(new ArrayAdapter<String>(

            this, R.layout.spinner_layout, mTestNames));

    }

/*

 * 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 gWidth;

int32_t gHeight;

rs_allocation gBlendSource;

void blend9(uchar *out, uint32_t x, uint32_t y) {

    uint32_t x1 = min(x+1, (uint32_t)gWidth);

    uint32_t x2 = max(x-1, (uint32_t)0);

    uint32_t y1 = min(y+1, (uint32_t)gHeight);

    uint32_t y2 = max(y-1, (uint32_t)0);

    uint p00 = 56 *  ((uchar *)rsGetElementAt(gBlendSource, x1, y1))[0];

    uint p01 = 114 * ((uchar *)rsGetElementAt(gBlendSource, x, y1))[0];

    uint p02 = 56 *  ((uchar *)rsGetElementAt(gBlendSource, x2, y1))[0];

    uint p10 = 114 * ((uchar *)rsGetElementAt(gBlendSource, x1, y))[0];

    uint p11 = 230 * ((uchar *)rsGetElementAt(gBlendSource, x, y))[0];

    uint p12 = 114 * ((uchar *)rsGetElementAt(gBlendSource, x2, y))[0];

    uint p20 = 56 *  ((uchar *)rsGetElementAt(gBlendSource, x1, y2))[0];

    uint p21 = 114 * ((uchar *)rsGetElementAt(gBlendSource, x, y2))[0];

    uint p22 = 56 *  ((uchar *)rsGetElementAt(gBlendSource, x2, y2))[0];

    p00 += p01;

    p02 += p10;

    p11 += p12;

    p20 += p21;

    p22 += p00;

    p02 += p11;

    p20 += p22;

    p20 += p02;

    *out = (uchar)(p20 >> 10);

}

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) ((uchar *)rsGetElementAt(gNoise, x, y))[0];

    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;

}