package org.hipi.image;
import org.hipi.image.PixelArray;
import org.hipi.util.ByteUtils;
/**
* A flat array of image pixel values represented as Java floats. This class includes routines
* for converting between non-linear gamma-compressed sRGB values and linear RGB values.
*/
public class PixelArrayFloat extends PixelArray {
float data[];
public PixelArrayFloat() {
super(TYPE_FLOAT, 0);
data = null;
}
public PixelArrayFloat(int size) {
super(TYPE_FLOAT, size);
data = new float[size];
}
public float[] getData() {
return data;
}
public void setSize(int size) throws IllegalArgumentException {
if (size < 0) {
throw new IllegalArgumentException("Invalid size of pixel array.");
}
this.size = size;
if (size == 0) {
this.data = null;
} else {
this.data = new float[size];
}
}
public byte[] getByteArray() {
return ByteUtils.floatArrayToByteArray(data);
}
public void setFromByteArray(byte[] bytes) throws IllegalArgumentException {
if (bytes == null || bytes.length == 0) {
data = null;
this.size = 0;
} else {
data = ByteUtils.byteArrayToFloatArray(bytes);
this.size = data.length;
}
}
public int getElem(int i) {
return (int)(Math.max(0,Math.min(255,(int)(data[i]*255.0f))));
}
private static final int[] gammaCompress = {0,2,4,5,7,8,10,11,13,14,15,17,18,19,20,21,22,22,23,24,25,26,27,27,28,29,29,30,31,31,32,33,33,34,35,35,36,36,37,37,38,38,39,40,40,41,41,42,42,43,43,43,44,44,45,45,46,46,47,47,47,48,48,49,49,50,50,50,51,51,52,52,52,53,53,53,54,54,55,55,55,56,56,56,57,57,57,58,58,58,59,59,60,60,60,60,61,61,61,62,62,62,63,63,63,64,64,64,65,65,65,65,66,66,66,67,67,67,68,68,68,68,69,69,69,70,70,70,70,71,71,71,71,72,72,72,73,73,73,73,74,74,74,74,75,75,75,75,76,76,76,76,77,77,77,77,78,78,78,78,79,79,79,79,80,80,80,80,81,81,81,81,81,82,82,82,82,83,83,83,83,84,84,84,84,84,85,85,85,85,86,86,86,86,86,87,87,87,87,87,88,88,88,88,89,89,89,89,89,90,90,90,90,90,91,91,91,91,91,92,92,92,92,92,93,93,93,93,93,94,94,94,94,94,95,95,95,95,95,96,96,96,96,96,96,97,97,97,97,97,98,98,98,98,98,99,99,99,99,99,99,100,100,100,100,100,101,101,101,101,101,101,102,102,102,102,102,102,103,103,103,103,103,104,104,104,104,104,104,105,105,105,105,105,105,106,106,106,106,106,106,107,107,107,107,107,107,108,108,108,108,108,108,109,109,109,109,109,109,110,110,110,110,110,110,111,111,111,111,111,111,111,112,112,112,112,112,112,113,113,113,113,113,113,114,114,114,114,114,114,114,115,115,115,115,115,115,115,116,116,116,116,116,116,117,117,117,117,117,117,117,118,118,118,118,118,118,118,119,119,119,119,119,119,120,120,120,120,120,120,120,121,121,121,121,121,121,121,122,122,122,122,122,122,122,123,123,123,123,123,123,123,123,124,124,124,124,124,124,124,125,125,125,125,125,125,125,126,126,126,126,126,126,126,127,127,127,127,127,127,127,127,128,128,128,128,128,128,128,129,129,129,129,129,129,129,129,130,130,130,130,130,130,130,130,131,131,131,131,131,131,131,132,132,132,132,132,132,132,132,133,133,133,133,133,133,133,133,134,134,134,134,134,134,134,134,135,135,135,135,135,135,135,135,136,136,136,136,136,136,136,136,137,137,137,137,137,137,137,137,138,138,138,138,138,138,138,138,138,139,139,139,139,139,139,139,139,140,140,140,140,140,140,140,140,141,141,141,141,141,141,141,141,141,142,142,142,142,142,142,142,142,143,143,143,143,143,143,143,143,143,144,144,144,144,144,144,144,144,144,145,145,145,145,145,145,145,145,146,146,146,146,146,146,146,146,146,147,147,147,147,147,147,147,147,147,148,148,148,148,148,148,148,148,148,149,149,149,149,149,149,149,149,149,150,150,150,150,150,150,150,150,150,151,151,151,151,151,151,151,151,151,151,152,152,152,152,152,152,152,152,152,153,153,153,153,153,153,153,153,153,154,154,154,154,154,154,154,154,154,154,155,155,155,155,155,155,155,155,155,155,156,156,156,156,156,156,156,156,156,157,157,157,157,157,157,157,157,157,157,158,158,158,158,158,158,158,158,158,158,159,159,159,159,159,159,159,159,159,159,160,160,160,160,160,160,160,160,160,160,161,161,161,161,161,161,161,161,161,161,162,162,162,162,162,162,162,162,162,162,163,163,163,163,163,163,163,163,163,163,164,164,164,164,164,164,164,164,164,164,165,165,165,165,165,165,165,165,165,165,165,166,166,166,166,166,166,166,166,166,166,167,167,167,167,167,167,167,167,167,167,167,168,168,168,168,168,168,168,168,168,168,169,169,169,169,169,169,169,169,169,169,169,170,170,170,170,170,170,170,170,170,170,170,171,171,171,171,171,171,171,171,171,171,172,172,172,172,172,172,172,172,172,172,172,173,173,173,173,173,173,173,173,173,173,173,174,174,174,174,174,174,174,174,174,174,174,174,175,175,175,175,175,175,175,175,175,175,175,176,176,176,176,176,176,176,176,176,176,176,177,177,177,177,177,177,177,177,177,177,177,178,178,178,178,178,178,178,178,178,178,178,178,179,179,179,179,179,179,179,179,179,179,179,180,180,180,180,180,180,180,180,180,180,180,180,181,181,181,181,181,181,181,181,181,181,181,181,182,182,182,182,182,182,182,182,182,182,182,183,183,183,183,183,183,183,183,183,183,183,183,184,184,184,184,184,184,184,184,184,184,184,184,185,185,185,185,185,185,185,185,185,185,185,185,186,186,186,186,186,186,186,186,186,186,186,186,187,187,187,187,187,187,187,187,187,187,187,187,188,188,188,188,188,188,188,188,188,188,188,188,188,189,189,189,189,189,189,189,189,189,189,189,189,190,190,190,190,190,190,190,190,190,190,190,190,191,191,191,191,191,191,191,191,191,191,191,191,191,192,192,192,192,192,192,192,192,192,192,192,192,192,193,193,193,193,193,193,193,193,193,193,193,193,194,194,194,194,194,194,194,194,194,194,194,194,194,195,195,195,195,195,195,195,195,195,195,195,195,195,196,196,196,196,196,196,196,196,196,196,196,196,196,197,197,197,197,197,197,197,197,197,197,197,197,197,198,198,198,198,198,198,198,198,198,198,198,198,198,199,199,199,199,199,199,199,199,199,199,199,199,199,200,200,200,200,200,200,200,200,200,200,200,200,200,200,201,201,201,201,201,201,201,201,201,201,201,201,201,202,202,202,202,202,202,202,202,202,202,202,202,202,203,203,203,203,203,203,203,203,203,203,203,203,203,203,204,204,204,204,204,204,204,204,204,204,204,204,204,204,205,205,205,205,205,205,205,205,205,205,205,205,205,206,206,206,206,206,206,206,206,206,206,206,206,206,206,207,207,207,207,207,207,207,207,207,207,207,207,207,207,208,208,208,208,208,208,208,208,208,208,208,208,208,208,209,209,209,209,209,209,209,209,209,209,209,209,209,209,210,210,210,210,210,210,210,210,210,210,210,210,210,210,211,211,211,211,211,211,211,211,211,211,211,211,211,211,211,212,212,212,212,212,212,212,212,212,212,212,212,212,212,213,213,213,213,213,213,213,213,213,213,213,213,213,213,214,214,214,214,214,214,214,214,214,214,214,214,214,214,214,215,215,215,215,215,215,215,215,215,215,215,215,215,215,215,216,216,216,216,216,216,216,216,216,216,216,216,216,216,217,217,217,217,217,217,217,217,217,217,217,217,217,217,217,218,218,218,218,218,218,218,218,218,218,218,218,218,218,218,219,219,219,219,219,219,219,219,219,219,219,219,219,219,219,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,221,221,221,221,221,221,221,221,221,221,221,221,221,221,221,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,223,223,223,223,223,223,223,223,223,223,223,223,223,223,223,224,224,224,224,224,224,224,224,224,224,224,224,224,224,224,225,225,225,225,225,225,225,225,225,225,225,225,225,225,225,225,226,226,226,226,226,226,226,226,226,226,226,226,226,226,226,227,227,227,227,227,227,227,227,227,227,227,227,227,227,227,227,228,228,228,228,228,228,228,228,228,228,228,228,228,228,228,228,229,229,229,229,229,229,229,229,229,229,229,229,229,229,229,229,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,231,231,231,231,231,231,231,231,231,231,231,231,231,231,231,231,232,232,232,232,232,232,232,232,232,232,232,232,232,232,232,232,233,233,233,233,233,233,233,233,233,233,233,233,233,233,233,233,234,234,234,234,234,234,234,234,234,234,234,234,234,234,234,234,234,235,235,235,235,235,235,235,235,235,235,235,235,235,235,235,235,236,236,236,236,236,236,236,236,236,236,236,236,236,236,236,236,236,237,237,237,237,237,237,237,237,237,237,237,237,237,237,237,237,238,238,238,238,238,238,238,238,238,238,238,238,238,238,238,238,238,239,239,239,239,239,239,239,239,239,239,239,239,239,239,239,239,239,240,240,240,240,240,240,240,240,240,240,240,240,240,240,240,240,240,241,241,241,241,241,241,241,241,241,241,241,241,241,241,241,241,241,242,242,242,242,242,242,242,242,242,242,242,242,242,242,242,242,242,243,243,243,243,243,243,243,243,243,243,243,243,243,243,243,243,243,244,244,244,244,244,244,244,244,244,244,244,244,244,244,244,244,244,245,245,245,245,245,245,245,245,245,245,245,245,245,245,245,245,245,246,246,246,246,246,246,246,246,246,246,246,246,246,246,246,246,246,246,247,247,247,247,247,247,247,247,247,247,247,247,247,247,247,247,247,248,248,248,248,248,248,248,248,248,248,248,248,248,248,248,248,248,248,249,249,249,249,249,249,249,249,249,249,249,249,249,249,249,249,249,249,250,250,250,250,250,250,250,250,250,250,250,250,250,250,250,250,250,250,251,251,251,251,251,251,251,251,251,251,251,251,251,251,251,251,251,251,252,252,252,252,252,252,252,252,252,252,252,252,252,252,252,252,252,252,253,253,253,253,253,253,253,253,253,253,253,253,253,253,253,253,253,253,254,254,254,254,254,254,254,254,254,254,254,254,254,254,254,254,254,254,255};
public int getElemNonLinSRGB(int i) {
// return getElem(i);
/*
// Convert from stored linear RGB value to 8-bit gamma compressed
// non-linear sRGB value
double linear = (double)data[i];
double nonlinear = ( ( linear <= 0.0031308 )
? ( 12.92 * linear )
: ( 1.055 * Math.pow( linear, 1.0/2.4 ) - 0.055 ) );
return (int)(Math.max(0,Math.min(255,(int)(nonlinear*255.0))));
*/
double linear = (double)data[i];
int lutIdx = Math.max(0,Math.min(2048,(int)(linear*(double)(2048-1)-0.5)));
return gammaCompress[lutIdx];
}
public void setElem(int i, int val) {
data[i] = ((float)val)/255.0f;
}
// LUT for nonlinear 8-bit sRGB => linear floating point RGB
private static final float[] gammaExpand = {0.0f,3.035269910469651E-4f,6.070539820939302E-4f,9.105809731408954E-4f,0.0012141079641878605f,0.0015176349552348256f,0.0018211619462817907f,0.002124688820913434f,0.002428215928375721f,0.0027317428030073643f,0.0030352699104696512f,0.0033465358428657055f,0.0036765073891729116f,0.004024717025458813f,0.0043914420530200005f,0.004776953253895044f,0.005181516520678997f,0.005605391692370176f,0.006048833020031452f,0.006512090563774109f,0.006995410192757845f,0.007499032188206911f,0.00802319310605526f,0.008568125776946545f,0.009134058840572834f,0.009721217676997185f,0.01032982300966978f,0.010960093699395657f,0.011612244881689548f,0.012286487966775894f,0.012983032502233982f,0.013702083379030228f,0.014443843625485897f,0.015208514407277107f,0.01599629409611225f,0.016807375475764275f,0.017641954123973846f,0.01850022003054619f,0.019382361322641373f,0.020288562402129173f,0.021219009533524513f,0.022173885256052017f,0.023153366521000862f,0.024157632142305374f,0.02518685907125473f,0.026241222396492958f,0.027320891618728638f,0.028426039963960648f,0.02955683507025242f,0.03071344457566738f,0.03189603239297867f,0.03310476616024971f,0.03433980792760849f,0.03560131415724754f,0.03688944876194f,0.0382043719291687f,0.039546236395835876f,0.040915198624134064f,0.0423114113509655f,0.04373503103852272f,0.045186202973127365f,0.04666508734226227f,0.04817182570695877f,0.04970656707882881f,0.05126945674419403f,0.052860647439956665f,0.05448027700185776f,0.05612849071621895f,0.05780543014407158f,0.05951123684644699f,0.061246052384376526f,0.06301001459360123f,0.06480326503515244f,0.0666259378194809f,0.06847816705703735f,0.07036009430885315f,0.07227185368537903f,0.07421357184648514f,0.07618538290262222f,0.07818742096424103f,0.0802198201417923f,0.08228270709514618f,0.08437620848417282f,0.08650045841932297f,0.08865558356046677f,0.09084171056747437f,0.09305896610021591f,0.09530746936798096f,0.09758734703063965f,0.09989872574806213f,0.10224173218011856f,0.10461648553609848f,0.10702310502529144f,0.109461709856987f,0.1119324266910553f,0.11443537473678589f,0.11697066575288773f,0.11953842639923096f,0.12213877588510513f,0.12477181851863861f,0.12743768095970154f,0.13013647496700287f,0.13286831974983215f,0.13563333451747894f,0.1384316086769104f,0.14126329123973846f,0.1441284716129303f,0.14702726900577545f,0.14995978772640228f,0.15292614698410034f,0.15592646598815918f,0.15896083414554596f,0.16202937066555023f,0.16513219475746155f,0.16826939582824707f,0.17144110798835754f,0.17464740574359894f,0.177888423204422f,0.18116424977779388f,0.18447498977184296f,0.18782077729701996f,0.19120168685913086f,0.1946178376674652f,0.19806931912899017f,0.2015562504529953f,0.20507873594760895f,0.20863686501979828f,0.21223075687885284f,0.2158605009317398f,0.21952620148658752f,0.22322796285152435f,0.22696587443351746f,0.23074005544185638f,0.2345505803823471f,0.23839756846427917f,0.24228112399578094f,0.2462013214826584f,0.25015828013420105f,0.2541520893573761f,0.2581828534603119f,0.2622506618499756f,0.26635560393333435f,0.27049779891967773f,0.2746773064136505f,0.2788942754268646f,0.28314873576164246f,0.28744083642959595f,0.2917706370353699f,0.2961382567882538f,0.30054378509521484f,0.3049873113632202f,0.30946892499923706f,0.31398871541023254f,0.31854677200317383f,0.32314321398735046f,0.3277781009674072f,0.3324515223503113f,0.33716362714767456f,0.34191441535949707f,0.34670406579971313f,0.35153260827064514f,0.35640013217926025f,0.3613067865371704f,0.366252601146698f,0.37123769521713257f,0.3762621283531189f,0.38132601976394653f,0.38642942905426025f,0.3915724754333496f,0.3967552185058594f,0.4019777774810791f,0.40724021196365356f,0.4125426113605499f,0.41788506507873535f,0.423267662525177f,0.42869049310684204f,0.43415364623069763f,0.43965718150138855f,0.44520118832588196f,0.4507857859134674f,0.4564110338687897f,0.46207699179649353f,0.4677838087081909f,0.47353148460388184f,0.4793201684951782f,0.48514994978904724f,0.4910208582878113f,0.4969329833984375f,0.5028864741325378f,0.5088813304901123f,0.5149176716804504f,0.520995557308197f,0.5271151065826416f,0.533276379108429f,0.5394794940948486f,0.5457244515419006f,0.5520114302635193f,0.5583403706550598f,0.5647115111351013f,0.5711248517036438f,0.577580451965332f,0.5840784311294556f,0.5906188488006592f,0.5972017645835876f,0.6038273572921753f,0.6104955673217773f,0.6172065734863281f,0.6239603757858276f,0.6307571530342102f,0.637596845626831f,0.6444796919822693f,0.6514056324958801f,0.6583748459815979f,0.6653872728347778f,0.672443151473999f,0.6795424818992615f,0.68668532371521f,0.6938717365264893f,0.7011018991470337f,0.7083757519721985f,0.715693473815918f,0.7230551242828369f,0.7304607629776001f,0.7379103899002075f,0.7454041838645935f,0.7529422044754028f,0.7605245113372803f,0.7681511640548706f,0.7758222222328186f,0.7835378050804138f,0.7912979125976562f,0.7991027235984802f,0.8069522380828857f,0.8148465752601624f,0.8227857351303101f,0.8307698965072632f,0.838798999786377f,0.8468732237815857f,0.8549926280975342f,0.8631572127342224f,0.8713670969009399f,0.8796223998069763f,0.8879231214523315f,0.8962693810462952f,0.9046611785888672f,0.9130986332893372f,0.9215818643569946f,0.9301108717918396f,0.9386857151985168f,0.9473065137863159f,0.9559733271598816f,0.9646862745285034f,0.9734452962875366f,0.9822505712509155f,0.9911020994186401f,1.0f};
public void setElemNonLinSRGB(int i, int val) {
setElemFloat(i, gammaExpand[(val < 0 ? 0 : (val > 255 ? 255 : val))]);
}
public float getElemFloat(int i) {
return data[i];
}
public void setElemFloat(int i, float val) {
data[i] = val;
}
public double getElemDouble(int i) {
return (double)data[i];
}
public void setElemDouble(int i, double val) {
data[i] = (float)val;
}
}