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<h1>Code coverage report for <span class="entity">lib\bitmapper.js</span></h1>
<h2>
Statements: <span class="metric">95.6% <small>(87 / 91)</small></span> &nbsp;&nbsp;&nbsp;&nbsp;
Branches: <span class="metric">90.32% <small>(28 / 31)</small></span> &nbsp;&nbsp;&nbsp;&nbsp;
Functions: <span class="metric">100% <small>(7 / 7)</small></span> &nbsp;&nbsp;&nbsp;&nbsp;
Lines: <span class="metric">95.6% <small>(87 / 91)</small></span> &nbsp;&nbsp;&nbsp;&nbsp;
Ignored: <span class="metric"><span class="ignore-none">none</span></span> &nbsp;&nbsp;&nbsp;&nbsp;
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<div class="path"><a href="../index.html">All files</a> &#187; <a href="index.html">lib/</a> &#187; bitmapper.js</div>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">var interlaceUtils = require('./interlace');
&nbsp;
function bitRetriever(data, depth) {
&nbsp;
var leftOver = [];
var i = 0;
function split() {
if (i === data.length) {
throw new Error("Ran out of data");
}
var byte = data[i];
i++;
switch(depth) {
<span class="branch-0 cbranch-no" title="branch not covered" > default:</span>
<span class="cstat-no" title="statement not covered" > throw new Error("unrecognised depth");</span>
<span class="cstat-no" title="statement not covered" > break;</span>
case 16:
var byte2 = data[i];
i++;
leftOver.push(((byte &lt;&lt; 8) + byte2));
break;
case 4:
var byte2 = byte &amp; 0x0f;
var byte1 = byte &gt;&gt; 4;
leftOver.push(byte1, byte2);
break;
case 2:
var byte4 = byte &amp; 3;
var byte3 = byte &gt;&gt; 2 &amp; 3;
var byte2 = byte &gt;&gt; 4 &amp; 3;
var byte1 = byte &gt;&gt; 6 &amp; 3;
leftOver.push(byte1, byte2, byte3, byte4);
break;
case 1:
var byte8 = byte &amp; 1;
var byte7 = byte &gt;&gt; 1 &amp; 1;
var byte6 = byte &gt;&gt; 2 &amp; 1;
var byte5 = byte &gt;&gt; 3 &amp; 1;
var byte4 = byte &gt;&gt; 4 &amp; 1;
var byte3 = byte &gt;&gt; 5 &amp; 1;
var byte2 = byte &gt;&gt; 6 &amp; 1;
var byte1 = byte &gt;&gt; 7 &amp; 1;
leftOver.push(byte1, byte2, byte3, byte4, byte5, byte6, byte7, byte8);
break;
}
}
return {
get: function(count) {
while(leftOver.length &lt; count) {
split();
}
var returner = leftOver.slice(0, count);
leftOver = leftOver.slice(count);
return returner;
},
resetAfterLine: function() {
leftOver.length = 0;
},
end: function() {
<span class="missing-if-branch" title="if path not taken" >I</span>if (i !== data.length) {
<span class="cstat-no" title="statement not covered" > throw new Error("extra data found");</span>
}
}
};
}
&nbsp;
exports.dataToBitMap = function(data, width, height, bpp, depth, interlace) {
&nbsp;
if (depth !== 8) {
var bits = bitRetriever(data, depth);
}
var pxData;
if (depth &lt;= 8) {
pxData = new Buffer(width * height * 4);
} else {
// TODO: could be more effecient and use a buffer but change how we write to use 16 bit write methods with index * 2
pxData = new Array(width * height * 4);
}
var maxBit = Math.pow(2, depth) - 1;
var rawPos = 0;
var pixelData;
var images;
var getPxPos;
&nbsp;
if (interlace) {
images = interlaceUtils.getImagePasses(width, height);
getPxPos = interlaceUtils.getInterlaceIterator(width, height);
} else {
var nonInterlacedPxPos = 0;
getPxPos = function() {
var returner = nonInterlacedPxPos;
nonInterlacedPxPos += 4;
return returner;
};
images = [{width: width, height: height}];
}
&nbsp;
for(var imageIndex = 0; imageIndex &lt; images.length; imageIndex++) {
var imageWidth = images[imageIndex].width;
var imageHeight = images[imageIndex].height;
var imagePass = images[imageIndex].index;
for (var y = 0; y &lt; imageHeight; y++) {
for (var x = 0; x &lt; imageWidth; x++) {
if (depth !== 8) {
pixelData = bits.get(bpp);
}
var pxPos = getPxPos(x, y, imagePass);
//console.log(x,y,imageIndex, pxPos);
for (var i = 0; i &lt; 4; i++) {
var idx = pixelBppMap[bpp][i];
if (depth === 8) {
if (i === data.length) {
throw new Error("Ran out of data");
}
pxData[pxPos + i] = idx !== 0xff ? data[idx + rawPos] : maxBit;
} else {
pxData[pxPos + i] = idx !== 0xff ? pixelData[idx] : maxBit;
}
}
//console.log("R", pxData[pxPos], "G", pxData[pxPos + 1], "B", pxData[pxPos + 2], "A", pxData[pxPos + 3]);
rawPos += bpp;
}
if (depth !== 8) {
bits.resetAfterLine();
}
}
}
if (depth === 8) {
<span class="missing-if-branch" title="if path not taken" >I</span>if (rawPos !== data.length) {
<span class="cstat-no" title="statement not covered" > throw new Error("extra data found");</span>
}
} else {
bits.end();
}
&nbsp;
return pxData;
};
&nbsp;
var pixelBppMap = {
1: { // L
0: 0,
1: 0,
2: 0,
3: 0xff
},
2: { // LA
0: 0,
1: 0,
2: 0,
3: 1
},
3: { // RGB
0: 0,
1: 1,
2: 2,
3: 0xff
},
4: { // RGBA
0: 0,
1: 1,
2: 2,
3: 3
}
};</pre></td></tr>
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