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keyboard heatmap example

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This commit is contained in:
Andrey Sidorov 2011-09-13 08:35:22 +10:00
parent 790758b7f2
commit c71996e267
5 changed files with 819 additions and 0 deletions
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72
examples/kbdheatmap/coordinates.json Normal file
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{
"~": [35, 120],
"`": [35, 120],
"1": [90, 120],
"!": [90, 120],
"2": [144, 120],
"@": [144, 120],
"3": [198, 120],
"#": [198, 120],
"4": [253, 120],
"$": [253, 120],
"5": [307, 120],
"%": [307, 120],
"6": [361, 120],
"^": [361, 120],
"7": [415, 120],
"&": [415, 120],
"8": [469, 120],
"*": [469, 120],
"9": [524, 120],
"(": [524, 120],
"0": [579, 120],
")": [579, 120],
"-": [630, 120],
"_": [630, 120],
"+": [685, 120],
"=": [685, 120],
"Q": [115, 174],
"W": [169, 174],
"E": [224, 174],
"R": [278, 174],
"T": [332, 174],
"Y": [386, 174],
"U": [440, 174],
"I": [494, 174],
"O": [548, 174],
"P": [602, 174],
"[": [656, 174],
"{": [656, 174],
"]": [710, 174],
"}": [710, 174],
"\\":[764, 174],
"|": [764, 174],
"A": [130, 225],
"S": [184, 225],
"D": [238, 225],
"F": [292, 225],
"G": [346, 225],
"H": [400, 225],
"J": [454, 225],
"K": [508, 225],
"L": [562, 225],
";": [616, 225],
":": [616, 225],
"'": [670, 225],
"\"": [670, 225],
"Z": [158, 275],
"X": [212, 275],
"C": [266, 275],
"V": [320, 275],
"B": [374, 275],
"N": [428, 275],
"M": [482, 275],
",": [536, 275],
"<": [536, 275],
".": [590, 275],
">": [590, 275],
"/": [644, 275],
"?": [644, 275],
" ": [500, 300],
"Left": [658, 345]
}

169
examples/kbdheatmap/kbdheatmap.js Executable file
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#!/home/laplace/node/node
var Buffer = require('buffer').Buffer;
var x11 = require('../../lib/x11');
var Exposure = x11.eventMask.Exposure;
var KeyPress = x11.eventMask.KeyPress;
var KeyRelease = x11.eventMask.KeyRelease;
var ButtonPress = x11.eventMask.ButtonPress;
var ButtonRelease = x11.eventMask.ButtonRelease;
// image and coords file from http://www.patrick-wied.at/projects/heatmap-keyboard/
// TODO: add simple tool to use&tag coords in own keyboard photo
// jpeg decoder is slightly modified version of https://github.com/notmasteryet/jpgjs
var kbdImg = require('./node-jpg').readJpeg('./keyboard.jpg');
var keycoords = require('./coordinates');
// from https://github.com/substack/node-keysym
var keysyms = require('./keysyms').records;
var ks2name = {};
for (var k in keysyms)
ks2name[keysyms[k].keysym] = keysyms[k].names;
var kk2name = {};
x11.createClient(function(display)
{
var X = display.client;
X.require('big-requests', function(BigReq)
{
X.require('render', function(Render) {
X.Render = Render;
BigReq.Enable(function(maxLen)
{
var min = display.min_keycode;
var max = display.max_keycode;
X.GetKeyboardMapping(min, max-min, function(list)
{
// map keycode to key name
for (var i=0; i < list.length; ++i)
{
var name = kk2name[i+min] = [];
var sublist = list[i];
for (var j =0; j < sublist.length; ++j)
name.push(ks2name[sublist[j]]);
}
main(X);
});
});
});
});
});
function main(X)
{
var display = X.display;
var Render = X.Render;
var root = display.screen[0].root;
var white = display.screen[0].white_pixel;
var black = display.screen[0].black_pixel;
var win = X.AllocID();
X.CreateWindow(
win, root,
0, 0, kbdImg.width, kbdImg.height,
1, 1, 0,
{
backgroundPixel: white, eventMask: Exposure|KeyPress|ButtonPress
}
);
X.MapWindow(win);
var win1 = X.AllocID();
X.CreateWindow(
win1, root,
0, 0, kbdImg.width, kbdImg.height,
1, 1, 0,
{
backgroundPixel: white, eventMask: Exposure|KeyPress|ButtonPress
}
);
X.MapWindow(win1);
var gc = X.AllocID();
X.CreateGC(gc, win);
var picGrad = X.AllocID();
Render.RadialGradient(picGrad, [150/2,150/2], [150/2,150/2], 0, 150/2,
[
[0, [0,0,0,0x15000 ] ],
[1, [0, 0, 0, 0x0] ]
]);
var pixmapHeatPush = X.AllocID();
X.CreatePixmap(pixmapHeatPush, win, 32, 150, 150);
var picHeatPush = X.AllocID();
Render.CreatePicture(picHeatPush, pixmapHeatPush, Render.rgba32);
Render.FillRectangles(1, picHeatPush, [0, 0, 0, 0], [0, 0, 150, 150]);
Render.Composite(3, picGrad, 0, picHeatPush, 0, 0, 0, 0, 0, 0, 150, 150);
var pixmapKbd = X.AllocID();
X.CreatePixmap(pixmapKbd, win, 24, kbdImg.width, kbdImg.height);
var picKbd = X.AllocID();
X.PutImage(2, pixmapKbd, gc, kbdImg.width, kbdImg.height, 0, 0, 0, 24, kbdImg.data);
Render.CreatePicture(picKbd, pixmapKbd, Render.rgb24);
var pixmapHeat = X.AllocID();
X.CreatePixmap(pixmapHeat, win, 32, kbdImg.width, kbdImg.height);
var picHeat = X.AllocID();
Render.CreatePicture(picHeat, pixmapHeat, Render.rgba32);
var picWin = X.AllocID();
Render.CreatePicture(picWin, win, Render.rgb24);
var picWin1 = X.AllocID();
Render.CreatePicture(picWin1, win1, Render.rgb24);
X.on('event', function(ev) {
if (ev.type == 12) // expose
{
Render.Composite(3, picKbd, 0, picWin, 0, 0, 0, 0, 0, 0, kbdImg.width, kbdImg.height);
} if (ev.type == 4) {
var x = ev.x;
var y = ev.y;
var mindist = 1e10;
var minkey = '';
for (var k in keycoords)
{
var xdist = keycoords[k][0] - x;
var ydist = keycoords[k][1] - y;
var dist = xdist*xdist + ydist+ydist;
if (dist < mindist)
{
minkey = k;
mindist = dist;
}
}
Render.Composite(3, picKbd, 0, picWin, 0, 0, 0, 0, 0, 0, kbdImg.width, kbdImg.height);
Render.Composite(3, picHeatPush, 0, picWin, 0, 0, 0, 0, x -150/2, y-150/2, 150, 150);
} if (ev.type == 2) {
var name = kk2name[ev.keycode];
for (var n in name)
{
var pt = keycoords[name[n]];
if (pt)
{
Render.Composite(3, picHeatPush, 0, picWin, 0, 0, 0, 0, pt[0] -150/2, pt[1]-150/2, 150, 150);
Render.Composite(3, picHeatPush, 0, picHeat, 0, 0, 0, 0, pt[0] -150/2, pt[1]-150/2, 150, 150);
Render.Composite(3, picHeatPush, 0, picWin1, 0, 0, 0, 0, pt[0] -150/2, pt[1]-150/2, 150, 150);
break;
} else {
//console.log(name);
}
}
} else {
//console.log(ev);
}
})
X.on('error', function(e) {
console.error(e.message, ' error in request ', e.stack);
process.exit(1);
});
}

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examples/kbdheatmap/keysyms.json Normal file
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577
examples/kbdheatmap/node-jpg.js Normal file
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
// - The JPEG specification can be found in the ITU CCITT Recommendation T.81
// (www.w3.org/Graphics/JPEG/itu-t81.pdf)
// - The JFIF specification can be found in the JPEG File Interchange Format
// (www.w3.org/Graphics/JPEG/jfif3.pdf)
// - The Adobe Application-Specific JPEG markers in the Supporting the DCT Filters
// in PostScript Level 2, Technical Note #5116
// (partners.adobe.com/public/developer/en/ps/sdk/5116.DCT_Filter.pdf)
var JpegImage = (function() {
function constructor() {
}
var iDCTTables = (function() {
var cosTables = [], i, j;
for (i = 0; i < 8; i++) {
cosTables.push(new Float32Array(8));
for (j = 0; j < 8; j++)
cosTables[i][j] = Math.cos((2 * i + 1) * j * Math.PI / 16) *
(j > 0 ? 1 : 1/Math.sqrt(2));
}
var x, y, u, v;
var tables = [];
for (y = 0; y < 8; y++) {
var cosTable_y = cosTables[y];
for (x = 0; x < 8; x++) {
var cosTable_x = cosTables[x];
var table = new Float32Array(64);
i = 0;
for (v = 0; v < 8; v++) {
for (u = 0; u < 8; u++)
table[i++] = cosTable_x[u] * cosTable_y[v];
}
tables.push(table);
}
}
return tables;
})();
function buildHuffmanTable(codeLengths, values) {
var k = 0, code = [], i, j, length = 16;
while (length > 0 && !codeLengths[length - 1])
length--;
code.push({children: [], index: 0});
var p = code[0], q;
for (i = 0; i < length; i++) {
for (j = 0; j < codeLengths[i]; j++) {
p = code.pop();
p.children[p.index] = values[k];
while (p.index > 0) {
p = code.pop();
}
p.index++;
code.push(p);
while (code.length <= i) {
code.push(q = {children: [], index: 0});
p.children[p.index] = q.children;
p = q;
}
k++;
}
if (i + 1 < length) {
// p here points to last code
code.push(q = {children: [], index: 0});
p.children[p.index] = q.children;
p = q;
}
}
return code[0].children;
}
function decodeScan(data, offset,
frame, components, resetInterval,
spectralStart, spectralEnd,
successivePrev, successive) {
var precision = frame.precision;
var samplesPerLine = frame.samplesPerLine;
var scanLines = frame.scanLines;
var progressive = frame.progressive;
var maxH = frame.maxH, maxV = frame.maxV;
var startOffset = offset, bitsData = 0, bitsCount = 0;
function readBit() {
if (bitsCount > 0) {
bitsCount--;
return (bitsData >> bitsCount) & 1;
}
bitsData = data[offset++];
if (bitsData == 0xFF) {
var nextByte = data[offset++];
if (nextByte) {
throw "unexpected marker: " + ((bitsData << 8) | nextByte).toString(16);
}
// unstuff 0
}
bitsCount = 7;
return bitsData >>> 7;
}
function decodeHuffman(tree) {
var node = tree, bit;
while ((bit = readBit()) !== null) {
node = node[bit];
if (typeof node === 'number')
return node;
if (typeof node !== 'object')
throw "invalid huffman sequence";
}
return null;
}
function receive(length) {
var n = 0;
while (length > 0) {
var bit = readBit();
if (bit === null) return;
n = (n << 1) | bit;
length--;
}
return n;
}
function receiveAndExtend(length) {
var n = receive(length);
if (n >= 1 << (length - 1))
return n;
return n + (-1 << length) + 1;
}
function decodeBaseline(component) {
var zz = new Int32Array(64);
var t = decodeHuffman(component.huffmanTableDC);
var diff = t === 0 ? 0 : receiveAndExtend(t);
zz[0]= (component.pred += diff);
var k = 1;
while (k < 64) {
var rs = decodeHuffman(component.huffmanTableAC);
var s = rs & 15, r = rs >> 4;
if (s === 0) {
if (r != 15)
break;
k += 16;
continue;
}
k += r;
zz[k] = receiveAndExtend(s);
k++;
}
return zz;
}
function quantizeAndInverse(zz, qt) {
var R = new Int32Array([
zz[0] * qt[0], zz[1] * qt[1], zz[5] * qt[5], zz[6] * qt[6], zz[14] * qt[14], zz[15] * qt[15], zz[27] * qt[27], zz[28] * qt[28],
zz[2] * qt[2], zz[4] * qt[4], zz[7] * qt[7], zz[13] * qt[13], zz[16] * qt[16], zz[26] * qt[26], zz[29] * qt[29], zz[42] * qt[42],
zz[3] * qt[3], zz[8] * qt[8], zz[12] * qt[12], zz[17] * qt[17], zz[25] * qt[25], zz[30] * qt[30], zz[41] * qt[41], zz[43] * qt[43],
zz[9] * qt[9], zz[11] * qt[11], zz[18] * qt[18], zz[24] * qt[24], zz[31] * qt[31], zz[40] * qt[40], zz[44] * qt[44], zz[53] * qt[53],
zz[10] * qt[10], zz[19] * qt[19], zz[23] * qt[23], zz[32] * qt[32], zz[39] * qt[39], zz[45] * qt[45], zz[52] * qt[52], zz[54] * qt[54],
zz[20] * qt[20], zz[22] * qt[22], zz[33] * qt[33], zz[38] * qt[38], zz[46] * qt[46], zz[51] * qt[51], zz[55] * qt[55], zz[60] * qt[60],
zz[21] * qt[21], zz[34] * qt[34], zz[37] * qt[37], zz[47] * qt[47], zz[50] * qt[50], zz[56] * qt[56], zz[59] * qt[59], zz[61] * qt[61],
zz[35] * qt[35], zz[36] * qt[36], zz[48] * qt[48], zz[49] * qt[49], zz[57] * qt[57], zz[58] * qt[58], zz[62] * qt[62], zz[63] * qt[63]]);
var i, j, y, x, u, v;
var r = new Uint8Array(64), ri;
for (i = 0; i < 64; i++) {
var sum = 0;
var table = iDCTTables[i];
for (j = 0; j < 64; j++)
sum += table[j] * R[j];
// TODO loosing precision?
var sample = 128 + ((sum / 4) >> (precision - 8));
// clamping
r[i] = sample < 0 ? 0 : sample > 0xFF ? 0xFF : sample;
}
return r;
}
function storeMcu(component, r, mcu, row, col) {
var mcuRow = (mcu / component.mcusPerLine) | 0;
var mcuCol = mcu % component.mcusPerLine;
var blockRow = mcuRow * component.v + row;
var blockCol = mcuCol * component.h + col;
var scanLine = blockRow << 3, sample = blockCol << 3;
var lines = component.lines;
while (scanLine + 8 > lines.length) {
lines.push(new Uint8Array(component.blocksPerLine << 3));
}
var i, j, offset = 0;
for (j = 0; j < 8; j++) {
var line = lines[scanLine + j];
for (i = 0; i < 8; i++)
line[sample + i] = r[offset++];
}
}
function storeBlock(component, r, mcu) {
var blockRow = (mcu / component.mcusPerLine) | 0;
var blockCol = mcu % component.mcusPerLine;
var scanLine = blockRow << 3, sample = blockCol << 3;
var lines = component.lines;
while (scanLine + 8 > lines.length) {
lines.push(new Uint8Array(component.blocksPerLine << 3));
}
var i, j, offset = 0;
for (j = 0; j < 8; j++) {
var line = lines[scanLine + j];
for (i = 0; i < 8; i++)
line[sample + i] = r[offset++];
}
}
var componentsLength = components.length;
var component, i, j, k, n;
if (progressive) {
throw "not implemented: progressive";
} else {
for (i = 0; i < componentsLength; i++) {
component = components[i];
component.blocksPerLine = (samplesPerLine * component.h / maxH + 7) >> 3;
component.mcusPerLine = ((component.blocksPerLine + component.h - 1) / component.h) | 0;
component.decode = decodeBaseline;
}
}
var mcu = 0, marker;
var mcuExpected =
(0|((((samplesPerLine + 7) >> 3) + maxH - 1) / maxH)) *
(0|((((scanLines + 7) >> 3) + maxV - 1) / maxV));
if (!resetInterval) resetInterval = mcuExpected;
var zz, r;
while (mcu < mcuExpected) {
if (componentsLength == 1) {
component = components[0];
for (n = 0; n < resetInterval; n++) {
zz = component.decode(component);
r = quantizeAndInverse(zz, component.quantizationTable);
storeBlock(component, r, mcu);
mcu++;
}
} else {
for (n = 0; n < resetInterval; n++) {
for (i = 0; i < componentsLength; i++) {
component = components[i];
var h = component.h, v = component.v;
for (j = 0; j < v; j++) {
for (k = 0; k < h; k++) {
zz = component.decode(component);
r = quantizeAndInverse(zz, component.quantizationTable);
storeMcu(component, r, mcu, j, k);
}
}
}
mcu++;
}
}
// find marker
bitsCount = 0;
marker = (data[offset] << 8) | data[offset + 1];
if (marker <= 0xFF00) {
throw "marker was not found";
}
if (marker >= 0xFFD0 && marker <= 0xFFD7) { // RSTx
offset += 2;
for (i = 0; i < componentsLength; i++)
components[i].pred = 0;
}
else
break;
}
return offset - startOffset;
}
constructor.prototype = {
load: function(path) {
var xhr = new XMLHttpRequest();
xhr.open("GET", path, true);
xhr.responseType = "arraybuffer";
xhr.onload = (function() {
// TODO catch parse error
var data = new Uint8Array(xhr.response || xhr.mozResponseArrayBuffer);
this.parse(data);
if (this.onload)
this.onload();
}).bind(this);
xhr.send(null);
},
parse: function(data) {
var offset = 0, length = data.length;
function readUint16() {
var value = (data[offset] << 8) | data[offset + 1];
offset += 2;
return value;
}
function readDataBlock() {
var length = readUint16();
//var array = data.subarray(offset, offset + length - 2);
var array = data.slice(offset, offset + length - 2);
offset += array.length;
return array;
}
var jfif = null;
var adobe = null;
var pixels = null;
var frame, resetInterval;
var quantizationTables = [], frames = [];
var huffmanTablesAC = [], huffmanTablesDC = [];
var fileMarker = readUint16();
if (fileMarker != 0xFFD8) { // SOI (Start of Image)
throw "SOI not found";
}
fileMarker = readUint16();
while (fileMarker != 0xFFD9) { // EOI (End of image)
var i, j, l;
switch(fileMarker) {
case 0xFFE0: // APP0 (Application Specific)
case 0xFFE1: // APP1
case 0xFFE2: // APP2
case 0xFFE3: // APP3
case 0xFFE4: // APP4
case 0xFFE5: // APP5
case 0xFFE6: // APP6
case 0xFFE7: // APP7
case 0xFFE8: // APP8
case 0xFFE9: // APP9
case 0xFFEA: // APP10
case 0xFFEB: // APP11
case 0xFFEC: // APP12
case 0xFFED: // APP13
case 0xFFEE: // APP14
case 0xFFEF: // APP15
case 0xFFFE: // COM (Comment)
var appData = readDataBlock();
if (fileMarker === 0xFFE0) {
if (appData[0] === 0x4A && appData[1] === 0x46 && appData[2] === 0x49 &&
appData[3] === 0x46 && appData[4] === 0) { // 'JFIF\x00'
jfif = {
version: { major: appData[5], minor: appData[6] },
densityUnits: appData[7],
xDensity: (appData[8] << 8) | appData[9],
yDensity: (appData[10] << 8) | appData[11],
thumbWidth: appData[12],
thumbHeight: appData[13],
//thumbData: appData.subarray(14, 14 + 3 * appData[12] * appData[13])
thumbData: appData.slice(14, 14 + 3 * appData[12] * appData[13])
};
}
}
// TODO APP1 - Exif
if (fileMarker === 0xFFEE) {
if (appData[0] === 0x41 && appData[1] === 0x64 && appData[2] === 0x6F &&
appData[3] === 0x62 && appData[4] === 65 && appData[5] === 0) { // 'Adobe\x00'
adobe = {
version: appData[6],
flags0: (appData[7] << 8) | appData[8],
flags1: (appData[9] << 8) | appData[10],
transformCode: appData[11]
};
}
}
break;
case 0xFFDB: // DQT (Define Quantization Tables)
var quantizationTableCount = Math.floor((readUint16() - 2) / 65);
for (i = 0; i < quantizationTableCount; i++) {
var quantizationTableSpec = data[offset++];
var tableData = new Int32Array(64);
if ((quantizationTableSpec >> 4) === 0) { // 8 bit values
for (j = 0; j < 64; j++)
tableData[j] = data[offset++];
} else if ((quantizationTableSpec >> 4) === 1) { //16 bit
tableData[j] = readUint16();
} else
throw "DQT: invalid table spec";
quantizationTables[quantizationTableSpec & 15] = tableData;
}
break;
case 0xFFC0: // SOF0 (Start of Frame, Baseline DCT)
case 0xFFC2: // SOF2 (Start of Frame, Progressive DCT)
readUint16(); // skip data length
frame = {};
frame.progressive = (fileMarker === 0xFFC2);
frame.precision = data[offset++];
frame.scanLines = readUint16();
frame.samplesPerLine = readUint16();
frame.components = [];
var componentsCount = data[offset++];
var maxH = 0, maxV = 0;
for (i = 0; i < componentsCount; i++) {
var componentId = data[offset];
var h = data[offset + 1] >> 4;
var v = data[offset + 1] & 15;
var qId = data[offset + 2];
frame.components[componentId] = {
h: h,
v: v,
quantizationTable: quantizationTables[qId],
pred: 0,
lines: []
};
offset += 3;
if (maxH < h) maxH = h;
if (maxV < v) maxV = v;
}
frame.maxH = maxH;
frame.maxV = maxV;
frames.push(frame);
break;
case 0xFFC4: // DHT (Define Huffman Tables)
var huffmanLength = readUint16();
for (i = 2; i < huffmanLength;) {
var huffmanTableSpec = data[offset++];
var codeLengths = new Uint8Array(16);
var codeLengthSum = 0;
for (j = 0; j < 16; j++, offset++)
codeLengthSum += (codeLengths[j] = data[offset]);
var huffmanValues = new Uint8Array(codeLengthSum);
for (j = 0; j < codeLengthSum; j++, offset++)
huffmanValues[j] = data[offset];
i += 17 + codeLengthSum;
((huffmanTableSpec >> 4) === 0 ?
huffmanTablesDC : huffmanTablesAC)[huffmanTableSpec & 15] =
buildHuffmanTable(codeLengths, huffmanValues);
}
break;
case 0xFFDD: // DRI (Define Restart Interval)
readUint16(); // skip data length
resetInterval = readUint16();
break;
case 0xFFDA: // SOS (Start of Scan)
var scanLength = readUint16();
var selectorsCount = data[offset++];
var components = [], component;
for (i = 0; i < selectorsCount; i++) {
component = frame.components[data[offset++]];
var tableSpec = data[offset++];
component.huffmanTableDC = huffmanTablesDC[tableSpec >> 4];
component.huffmanTableAC = huffmanTablesAC[tableSpec & 15];
components.push(component);
}
var spectralStart = data[offset++];
var spectralEnd = data[offset++];
var successiveApproximation = data[offset++];
var processed = decodeScan(data, offset,
frame, components, resetInterval,
spectralStart, spectralEnd,
successiveApproximation >> 4, successiveApproximation & 15);
offset += processed;
break;
default:
throw "unknown JPEG marker " + fileMarker.toString(16);
}
fileMarker = readUint16();
}
if (frames.length != 1)
throw "only single frame JPEGs supported";
this.width = frame.samplesPerLine;
this.height = frame.scanLines;
this.jfif = jfif;
this.adobe = adobe;
this.components = [];
for (var id in frame.components) {
if (frame.components.hasOwnProperty(id)) {
this.components.push({
lines: frame.components[id].lines,
scaleX: frame.components[id].h / frame.maxH,
scaleY: frame.components[id].v / frame.maxV
});
}
}
},
copyToImageData: function(imageData) {
var width = imageData.width, height = imageData.height;
var scaleX = this.width / width, scaleY = this.height / height;
var component1, component2, component3, component4;
var component1Line, component2Line, component3Line, component4Line;
var x, y;
var offset = 0, data = imageData.data;
var Y, Cb, Cr, K, C, M, Ye;
switch (this.components.length) {
case 1:
component1 = this.components[0];
for (y = 0; y < height; y++) {
component1Line = component1.lines[0 | (y * component1.scaleY * scaleY)];
for (x = 0; x < width; x++) {
Y = component1Line[0 | (x * component1.scaleX * scaleX)];
data[offset++] = Y;
data[offset++] = Y;
data[offset++] = Y;
data[offset++] = 255;
}
}
break;
case 3:
component1 = this.components[0];
component2 = this.components[1];
component3 = this.components[2];
for (y = 0; y < height; y++) {
component1Line = component1.lines[0 | (y * component1.scaleY * scaleY)];
component2Line = component2.lines[0 | (y * component2.scaleY * scaleY)];
component3Line = component3.lines[0 | (y * component3.scaleY * scaleY)];
for (x = 0; x < width; x++) {
Y = component1Line[0 | (x * component1.scaleX * scaleX)];
Cb = component2Line[0 | (x * component2.scaleX * scaleX)];
Cr = component3Line[0 | (x * component3.scaleX * scaleX)];
data[offset++] = Y + 1.402 * (Cr - 128);
data[offset++] = Y - 0.3441363 * (Cb - 128) - 0.71413636 * (Cr - 128);
data[offset++] = Y + 1.772 * (Cb - 128);
data[offset++] = 255;
}
}
break;
case 4:
component1 = this.components[0];
component2 = this.components[1];
component3 = this.components[2];
component4 = this.components[3];
for (y = 0; y < height; y++) {
component1Line = component1.lines[0 | (y * component1.scaleY * scaleY)];
component2Line = component2.lines[0 | (y * component2.scaleY * scaleY)];
component3Line = component3.lines[0 | (y * component3.scaleY * scaleY)];
component4Line = component4.lines[0 | (y * component4.scaleY * scaleY)];
for (x = 0; x < width; x++) {
Y = component1Line[0 | (x * component1.scaleX * scaleX)];
Cb = component2Line[0 | (x * component2.scaleX * scaleX)];
Cr = component3Line[0 | (x * component3.scaleX * scaleX)];
K = component4Line[0 | (x * component4.scaleX * scaleX)];
C = 255 - (Y + 1.402 * (Cr - 128));
M = 255 - (Y - 0.3441363 * (Cb - 128) - 0.71413636 * (Cr - 128));
Ye = 255 - (Y + 1.772 * (Cb - 128));
data[offset++] = 255 - Math.min(255, C * (1 - K / 255) + K);
data[offset++] = 255 - Math.min(255, M * (1 - K / 255) + K);
data[offset++] = 255 - Math.min(255, Ye * (1 - K / 255) + K);
data[offset++] = 255;
}
}
break;
}
}
};
return constructor;
})();
var Buffer = require('buffer').Buffer;
var fs = require('fs');
module.exports.readJpeg = function(path)
{
var jpgData = fs.readFileSync(path);
var j = new JpegImage();
j.parse(jpgData);
var imageData = {};
imageData.width = j.width;
imageData.height = j.height;
imageData.data = new Buffer(j.width*j.height*4);
j.copyToImageData(imageData);
return imageData;
}