mirror of
https://github.com/boxgaming/qbjs.git
synced 2024-05-12 08:00:12 +00:00
Add files via upload
This commit is contained in:
parent
521a3fba41
commit
051a962daa
561
samples/include/gif/GIFEncoder.js
Normal file
561
samples/include/gif/GIFEncoder.js
Normal file
|
@ -0,0 +1,561 @@
|
|||
/**
|
||||
* This class lets you encode animated GIF files
|
||||
* Base class : http://www.java2s.com/Code/Java/2D-Graphics-GUI/AnimatedGifEncoder.htm
|
||||
* @author Kevin Weiner (original Java version - kweiner@fmsware.com)
|
||||
* @author Thibault Imbert (AS3 version - bytearray.org)
|
||||
* @author Kevin Kwok (JavaScript version - https://github.com/antimatter15/jsgif)
|
||||
* @version 0.1 AS3 implementation
|
||||
*/
|
||||
|
||||
GIFEncoder = function() {
|
||||
|
||||
for (var i = 0, chr = {}; i < 256; i++)
|
||||
chr[i] = String.fromCharCode(i);
|
||||
|
||||
function ByteArray() {
|
||||
this.bin = [];
|
||||
}
|
||||
|
||||
ByteArray.prototype.getData = function() {
|
||||
for (var v = '', l = this.bin.length, i = 0; i < l; i++)
|
||||
v += chr[this.bin[i]];
|
||||
return v;
|
||||
};
|
||||
|
||||
ByteArray.prototype.writeByte = function(val) {
|
||||
this.bin.push(val);
|
||||
};
|
||||
|
||||
ByteArray.prototype.writeUTFBytes = function(string) {
|
||||
for (var l = string.length, i = 0; i < l; i++)
|
||||
this.writeByte(string.charCodeAt(i));
|
||||
};
|
||||
|
||||
ByteArray.prototype.writeBytes = function(array, offset, length) {
|
||||
for (var l = length || array.length, i = offset || 0; i < l; i++)
|
||||
this.writeByte(array[i]);
|
||||
};
|
||||
|
||||
var exports = {};
|
||||
var width; // image size
|
||||
var height;
|
||||
var transparent = null; // transparent color if given
|
||||
var transIndex; // transparent index in color table
|
||||
var repeat = -1; // no repeat
|
||||
var delay = 0; // frame delay (hundredths)
|
||||
var started = false; // ready to output frames
|
||||
var out;
|
||||
var image; // current frame
|
||||
var pixels; // BGR byte array from frame
|
||||
var indexedPixels; // converted frame indexed to palette
|
||||
var colorDepth; // number of bit planes
|
||||
var colorTab; // RGB palette
|
||||
var usedEntry = []; // active palette entries
|
||||
var palSize = 7; // color table size (bits-1)
|
||||
var dispose = -1; // disposal code (-1 = use default)
|
||||
var closeStream = false; // close stream when finished
|
||||
var firstFrame = true;
|
||||
var sizeSet = false; // if false, get size from first frame
|
||||
var sample = 10; // default sample interval for quantizer
|
||||
var comment = "Generated by jsgif (https://github.com/antimatter15/jsgif/)"; // default comment for generated gif
|
||||
|
||||
/**
|
||||
* Sets the delay time between each frame, or changes it for subsequent frames
|
||||
* (applies to last frame added)
|
||||
* int delay time in milliseconds
|
||||
* @param ms
|
||||
*/
|
||||
|
||||
var setDelay = exports.setDelay = function setDelay(ms) {
|
||||
delay = Math.round(ms / 10);
|
||||
};
|
||||
|
||||
/**
|
||||
* Sets the GIF frame disposal code for the last added frame and any
|
||||
*
|
||||
* subsequent frames. Default is 0 if no transparent color has been set,
|
||||
* otherwise 2.
|
||||
* @param code
|
||||
* int disposal code.
|
||||
*/
|
||||
|
||||
var setDispose = exports.setDispose = function setDispose(code) {
|
||||
if (code >= 0) dispose = code;
|
||||
};
|
||||
|
||||
/**
|
||||
* Sets the number of times the set of GIF frames should be played. Default is
|
||||
* 1; 0 means play indefinitely. Must be invoked before the first image is
|
||||
* added.
|
||||
*
|
||||
* @param iter
|
||||
* int number of iterations.
|
||||
* @return
|
||||
*/
|
||||
|
||||
var setRepeat = exports.setRepeat = function setRepeat(iter) {
|
||||
if (iter >= 0) repeat = iter;
|
||||
};
|
||||
|
||||
/**
|
||||
* Sets the transparent color for the last added frame and any subsequent
|
||||
* frames. Since all colors are subject to modification in the quantization
|
||||
* process, the color in the final palette for each frame closest to the given
|
||||
* color becomes the transparent color for that frame. May be set to null to
|
||||
* indicate no transparent color.
|
||||
* @param
|
||||
* Color to be treated as transparent on display.
|
||||
*/
|
||||
|
||||
var setTransparent = exports.setTransparent = function setTransparent(c) {
|
||||
transparent = c;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Sets the comment for the block comment
|
||||
* @param
|
||||
* string to be insterted as comment
|
||||
*/
|
||||
|
||||
var setComment = exports.setComment = function setComment(c) {
|
||||
comment = c;
|
||||
};
|
||||
|
||||
|
||||
|
||||
/**
|
||||
* The addFrame method takes an incoming BitmapData object to create each frames
|
||||
* @param
|
||||
* BitmapData object to be treated as a GIF's frame
|
||||
*/
|
||||
|
||||
var addFrame = exports.addFrame = function addFrame(im, is_imageData) {
|
||||
|
||||
if ((im === null) || !started || out === null) {
|
||||
throw new Error("Please call start method before calling addFrame");
|
||||
}
|
||||
|
||||
var ok = true;
|
||||
|
||||
try {
|
||||
if (!is_imageData) {
|
||||
image = im.getImageData(0, 0, im.canvas.width, im.canvas.height).data;
|
||||
if (!sizeSet) setSize(im.canvas.width, im.canvas.height);
|
||||
} else {
|
||||
if(im instanceof ImageData) {
|
||||
image = im.data;
|
||||
if(!sizeset || width!=im.width || height!=im.height) {
|
||||
setSize(im.width,im.height);
|
||||
} else {
|
||||
|
||||
}
|
||||
} else if(im instanceof Uint8ClampedArray) {
|
||||
if(im.length==(width*height*4)) {
|
||||
image=im;
|
||||
} else {
|
||||
console.log("Please set the correct size: ImageData length mismatch");
|
||||
ok=false;
|
||||
}
|
||||
} else {
|
||||
console.log("Please provide correct input");
|
||||
ok=false;
|
||||
}
|
||||
}
|
||||
getImagePixels(); // convert to correct format if necessary
|
||||
analyzePixels(); // build color table & map pixels
|
||||
|
||||
if (firstFrame) {
|
||||
writeLSD(); // logical screen descriptior
|
||||
writePalette(); // global color table
|
||||
if (repeat >= 0) {
|
||||
// use NS app extension to indicate reps
|
||||
writeNetscapeExt();
|
||||
}
|
||||
}
|
||||
|
||||
writeGraphicCtrlExt(); // write graphic control extension
|
||||
if (comment !== '') {
|
||||
writeCommentExt(); // write comment extension
|
||||
}
|
||||
writeImageDesc(); // image descriptor
|
||||
if (!firstFrame) writePalette(); // local color table
|
||||
writePixels(); // encode and write pixel data
|
||||
firstFrame = false;
|
||||
} catch (e) {
|
||||
ok = false;
|
||||
}
|
||||
|
||||
return ok;
|
||||
};
|
||||
|
||||
/**
|
||||
* @description: Downloads the encoded gif with the given name
|
||||
* No need of any conversion from the stream data (out) to base64
|
||||
* Solves the issue of large file sizes when there are more frames
|
||||
* and does not involve in creation of any temporary data in the process
|
||||
* so no wastage of memory, and speeds up the process of downloading
|
||||
* to just calling this function.
|
||||
* @parameter {String} filename filename used for downloading the gif
|
||||
*/
|
||||
|
||||
var download = exports.download = function download(filename) {
|
||||
if(out===null || closeStream==false) {
|
||||
console.log("Please call start method and add frames and call finish method before calling download");
|
||||
} else {
|
||||
filename= filename !== undefined ? ( filename.endsWith(".gif")? filename: filename+".gif" ): "download.gif";
|
||||
var templink = document.createElement("a");
|
||||
templink.download=filename;
|
||||
templink.href= URL.createObjectURL(new Blob([new Uint8Array(out.bin)], {type : "image/gif" } ));
|
||||
templink.click();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Adds final trailer to the GIF stream, if you don't call the finish method
|
||||
* the GIF stream will not be valid.
|
||||
*/
|
||||
|
||||
var finish = exports.finish = function finish() {
|
||||
|
||||
if (!started) return false;
|
||||
|
||||
var ok = true;
|
||||
started = false;
|
||||
|
||||
try {
|
||||
out.writeByte(0x3b); // gif trailer
|
||||
closeStream=true;
|
||||
} catch (e) {
|
||||
ok = false;
|
||||
}
|
||||
|
||||
return ok;
|
||||
};
|
||||
|
||||
/**
|
||||
* Resets some members so that a new stream can be started.
|
||||
* This method is actually called by the start method
|
||||
*/
|
||||
|
||||
var reset = function reset() {
|
||||
|
||||
// reset for subsequent use
|
||||
transIndex = 0;
|
||||
image = null;
|
||||
pixels = null;
|
||||
indexedPixels = null;
|
||||
colorTab = null;
|
||||
closeStream = false;
|
||||
firstFrame = true;
|
||||
};
|
||||
|
||||
/**
|
||||
* * Sets frame rate in frames per second. Equivalent to
|
||||
* <code>setDelay(1000/fps)</code>.
|
||||
* @param fps
|
||||
* float frame rate (frames per second)
|
||||
*/
|
||||
|
||||
var setFrameRate = exports.setFrameRate = function setFrameRate(fps) {
|
||||
if (fps != 0xf) delay = Math.round(100 / fps);
|
||||
};
|
||||
|
||||
/**
|
||||
* Sets quality of color quantization (conversion of images to the maximum 256
|
||||
* colors allowed by the GIF specification). Lower values (minimum = 1)
|
||||
* produce better colors, but slow processing significantly. 10 is the
|
||||
* default, and produces good color mapping at reasonable speeds. Values
|
||||
* greater than 20 do not yield significant improvements in speed.
|
||||
* @param quality
|
||||
* int greater than 0.
|
||||
* @return
|
||||
*/
|
||||
|
||||
var setQuality = exports.setQuality = function setQuality(quality) {
|
||||
if (quality < 1) quality = 1;
|
||||
sample = quality;
|
||||
};
|
||||
|
||||
/**
|
||||
* Sets the GIF frame size. The default size is the size of the first frame
|
||||
* added if this method is not invoked.
|
||||
* @param w
|
||||
* int frame width.
|
||||
* @param h
|
||||
* int frame width.
|
||||
*/
|
||||
|
||||
var setSize = exports.setSize = function setSize(w, h) {
|
||||
|
||||
if (started && !firstFrame) return;
|
||||
width = w;
|
||||
height = h;
|
||||
if (width < 1) width = 320;
|
||||
if (height < 1) height = 240;
|
||||
sizeSet = true;
|
||||
};
|
||||
|
||||
/**
|
||||
* Initiates GIF file creation on the given stream.
|
||||
* @param os
|
||||
* OutputStream on which GIF images are written.
|
||||
* @return false if initial write failed.
|
||||
*/
|
||||
|
||||
var start = exports.start = function start() {
|
||||
|
||||
reset();
|
||||
var ok = true;
|
||||
closeStream = false;
|
||||
out = new ByteArray();
|
||||
try {
|
||||
out.writeUTFBytes("GIF89a"); // header
|
||||
} catch (e) {
|
||||
ok = false;
|
||||
}
|
||||
|
||||
return started = ok;
|
||||
};
|
||||
|
||||
var cont = exports.cont = function cont() {
|
||||
|
||||
reset();
|
||||
var ok = true;
|
||||
closeStream = false;
|
||||
out = new ByteArray();
|
||||
|
||||
return started = ok;
|
||||
};
|
||||
|
||||
/**
|
||||
* Analyzes image colors and creates color map.
|
||||
*/
|
||||
|
||||
var analyzePixels = function analyzePixels() {
|
||||
|
||||
var len = pixels.length;
|
||||
var nPix = len / 3;
|
||||
indexedPixels = [];
|
||||
var nq = new NeuQuant(pixels, len, sample);
|
||||
|
||||
// initialize quantizer
|
||||
colorTab = nq.process(); // create reduced palette
|
||||
|
||||
// map image pixels to new palette
|
||||
var k = 0;
|
||||
for (var j = 0; j < nPix; j++) {
|
||||
var index = nq.map(pixels[k++] & 0xff, pixels[k++] & 0xff, pixels[k++] & 0xff);
|
||||
usedEntry[index] = true;
|
||||
indexedPixels[j] = index;
|
||||
}
|
||||
|
||||
pixels = null;
|
||||
colorDepth = 8;
|
||||
palSize = 7;
|
||||
|
||||
// get closest match to transparent color if specified
|
||||
if (transparent !== null) {
|
||||
transIndex = findClosest(transparent);
|
||||
}
|
||||
};
|
||||
|
||||
/**
|
||||
* Returns index of palette color closest to c
|
||||
*/
|
||||
|
||||
var findClosest = function findClosest(c) {
|
||||
|
||||
if (colorTab === null) return -1;
|
||||
var r = (c & 0xFF0000) >> 16;
|
||||
var g = (c & 0x00FF00) >> 8;
|
||||
var b = (c & 0x0000FF);
|
||||
var minpos = 0;
|
||||
var dmin = 256 * 256 * 256;
|
||||
var len = colorTab.length;
|
||||
|
||||
for (var i = 0; i < len;) {
|
||||
var dr = r - (colorTab[i++] & 0xff);
|
||||
var dg = g - (colorTab[i++] & 0xff);
|
||||
var db = b - (colorTab[i] & 0xff);
|
||||
var d = dr * dr + dg * dg + db * db;
|
||||
var index = i / 3;
|
||||
if (usedEntry[index] && (d < dmin)) {
|
||||
dmin = d;
|
||||
minpos = index;
|
||||
}
|
||||
i++;
|
||||
}
|
||||
return minpos;
|
||||
};
|
||||
|
||||
/**
|
||||
* Extracts image pixels into byte array "pixels
|
||||
*/
|
||||
|
||||
var getImagePixels = function getImagePixels() {
|
||||
var w = width;
|
||||
var h = height;
|
||||
pixels = [];
|
||||
var data = image;
|
||||
var count = 0;
|
||||
|
||||
for (var i = 0; i < h; i++) {
|
||||
|
||||
for (var j = 0; j < w; j++) {
|
||||
|
||||
var b = (i * w * 4) + j * 4;
|
||||
pixels[count++] = data[b];
|
||||
pixels[count++] = data[b + 1];
|
||||
pixels[count++] = data[b + 2];
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
};
|
||||
|
||||
/**
|
||||
* Writes Graphic Control Extension
|
||||
*/
|
||||
|
||||
var writeGraphicCtrlExt = function writeGraphicCtrlExt() {
|
||||
out.writeByte(0x21); // extension introducer
|
||||
out.writeByte(0xf9); // GCE label
|
||||
out.writeByte(4); // data block size
|
||||
var transp;
|
||||
var disp;
|
||||
if (transparent === null) {
|
||||
transp = 0;
|
||||
disp = 0; // dispose = no action
|
||||
} else {
|
||||
transp = 1;
|
||||
disp = 2; // force clear if using transparent color
|
||||
}
|
||||
if (dispose >= 0) {
|
||||
disp = dispose & 7; // user override
|
||||
}
|
||||
disp <<= 2;
|
||||
// packed fields
|
||||
out.writeByte(0 | // 1:3 reserved
|
||||
disp | // 4:6 disposal
|
||||
0 | // 7 user input - 0 = none
|
||||
transp); // 8 transparency flag
|
||||
|
||||
WriteShort(delay); // delay x 1/100 sec
|
||||
out.writeByte(transIndex); // transparent color index
|
||||
out.writeByte(0); // block terminator
|
||||
};
|
||||
|
||||
/**
|
||||
* Writes Comment Extention
|
||||
*/
|
||||
|
||||
var writeCommentExt = function writeCommentExt() {
|
||||
out.writeByte(0x21); // extension introducer
|
||||
out.writeByte(0xfe); // comment label
|
||||
out.writeByte(comment.length); // Block Size (s)
|
||||
out.writeUTFBytes(comment);
|
||||
out.writeByte(0); // block terminator
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Writes Image Descriptor
|
||||
*/
|
||||
|
||||
var writeImageDesc = function writeImageDesc() {
|
||||
|
||||
out.writeByte(0x2c); // image separator
|
||||
WriteShort(0); // image position x,y = 0,0
|
||||
WriteShort(0);
|
||||
WriteShort(width); // image size
|
||||
WriteShort(height);
|
||||
|
||||
// packed fields
|
||||
if (firstFrame) {
|
||||
// no LCT - GCT is used for first (or only) frame
|
||||
out.writeByte(0);
|
||||
} else {
|
||||
// specify normal LCT
|
||||
out.writeByte(0x80 | // 1 local color table 1=yes
|
||||
0 | // 2 interlace - 0=no
|
||||
0 | // 3 sorted - 0=no
|
||||
0 | // 4-5 reserved
|
||||
palSize); // 6-8 size of color table
|
||||
}
|
||||
};
|
||||
|
||||
/**
|
||||
* Writes Logical Screen Descriptor
|
||||
*/
|
||||
|
||||
var writeLSD = function writeLSD() {
|
||||
|
||||
// logical screen size
|
||||
WriteShort(width);
|
||||
WriteShort(height);
|
||||
// packed fields
|
||||
out.writeByte((0x80 | // 1 : global color table flag = 1 (gct used)
|
||||
0x70 | // 2-4 : color resolution = 7
|
||||
0x00 | // 5 : gct sort flag = 0
|
||||
palSize)); // 6-8 : gct size
|
||||
|
||||
out.writeByte(0); // background color index
|
||||
out.writeByte(0); // pixel aspect ratio - assume 1:1
|
||||
};
|
||||
|
||||
/**
|
||||
* Writes Netscape application extension to define repeat count.
|
||||
*/
|
||||
|
||||
var writeNetscapeExt = function writeNetscapeExt() {
|
||||
out.writeByte(0x21); // extension introducer
|
||||
out.writeByte(0xff); // app extension label
|
||||
out.writeByte(11); // block size
|
||||
out.writeUTFBytes("NETSCAPE" + "2.0"); // app id + auth code
|
||||
out.writeByte(3); // sub-block size
|
||||
out.writeByte(1); // loop sub-block id
|
||||
WriteShort(repeat); // loop count (extra iterations, 0=repeat forever)
|
||||
out.writeByte(0); // block terminator
|
||||
};
|
||||
|
||||
/**
|
||||
* Writes color table
|
||||
*/
|
||||
|
||||
var writePalette = function writePalette() {
|
||||
out.writeBytes(colorTab);
|
||||
var n = (3 * 256) - colorTab.length;
|
||||
for (var i = 0; i < n; i++) out.writeByte(0);
|
||||
};
|
||||
|
||||
var WriteShort = function WriteShort(pValue) {
|
||||
out.writeByte(pValue & 0xFF);
|
||||
out.writeByte((pValue >> 8) & 0xFF);
|
||||
};
|
||||
|
||||
/**
|
||||
* Encodes and writes pixel data
|
||||
*/
|
||||
|
||||
var writePixels = function writePixels() {
|
||||
var myencoder = new LZWEncoder(width, height, indexedPixels, colorDepth);
|
||||
myencoder.encode(out);
|
||||
};
|
||||
|
||||
/**
|
||||
* Retrieves the GIF stream
|
||||
*/
|
||||
|
||||
var stream = exports.stream = function stream() {
|
||||
return out;
|
||||
};
|
||||
|
||||
var setProperties = exports.setProperties = function setProperties(has_start, is_first) {
|
||||
started = has_start;
|
||||
firstFrame = is_first;
|
||||
};
|
||||
|
||||
return exports;
|
||||
|
||||
};
|
277
samples/include/gif/LZWEncoder.js
Normal file
277
samples/include/gif/LZWEncoder.js
Normal file
|
@ -0,0 +1,277 @@
|
|||
/**
|
||||
* This class handles LZW encoding
|
||||
* Adapted from Jef Poskanzer's Java port by way of J. M. G. Elliott.
|
||||
* @author Kevin Weiner (original Java version - kweiner@fmsware.com)
|
||||
* @author Thibault Imbert (AS3 version - bytearray.org)
|
||||
* @author Kevin Kwok (JavaScript version - https://github.com/antimatter15/jsgif)
|
||||
* @version 0.1 AS3 implementation
|
||||
*/
|
||||
|
||||
LZWEncoder = function() {
|
||||
|
||||
var exports = {};
|
||||
var EOF = -1;
|
||||
var imgW;
|
||||
var imgH;
|
||||
var pixAry;
|
||||
var initCodeSize;
|
||||
var remaining;
|
||||
var curPixel;
|
||||
|
||||
// GIFCOMPR.C - GIF Image compression routines
|
||||
// Lempel-Ziv compression based on 'compress'. GIF modifications by
|
||||
// David Rowley (mgardi@watdcsu.waterloo.edu)
|
||||
// General DEFINEs
|
||||
|
||||
var BITS = 12;
|
||||
var HSIZE = 5003; // 80% occupancy
|
||||
|
||||
// GIF Image compression - modified 'compress'
|
||||
// Based on: compress.c - File compression ala IEEE Computer, June 1984.
|
||||
// By Authors: Spencer W. Thomas (decvax!harpo!utah-cs!utah-gr!thomas)
|
||||
// Jim McKie (decvax!mcvax!jim)
|
||||
// Steve Davies (decvax!vax135!petsd!peora!srd)
|
||||
// Ken Turkowski (decvax!decwrl!turtlevax!ken)
|
||||
// James A. Woods (decvax!ihnp4!ames!jaw)
|
||||
// Joe Orost (decvax!vax135!petsd!joe)
|
||||
|
||||
var n_bits; // number of bits/code
|
||||
var maxbits = BITS; // user settable max # bits/code
|
||||
var maxcode; // maximum code, given n_bits
|
||||
var maxmaxcode = 1 << BITS; // should NEVER generate this code
|
||||
var htab = [];
|
||||
var codetab = [];
|
||||
var hsize = HSIZE; // for dynamic table sizing
|
||||
var free_ent = 0; // first unused entry
|
||||
|
||||
// block compression parameters -- after all codes are used up,
|
||||
// and compression rate changes, start over.
|
||||
|
||||
var clear_flg = false;
|
||||
|
||||
// Algorithm: use open addressing double hashing (no chaining) on the
|
||||
// prefix code / next character combination. We do a variant of Knuth's
|
||||
// algorithm D (vol. 3, sec. 6.4) along with G. Knott's relatively-prime
|
||||
// secondary probe. Here, the modular division first probe is gives way
|
||||
// to a faster exclusive-or manipulation. Also do block compression with
|
||||
// an adaptive reset, whereby the code table is cleared when the compression
|
||||
// ratio decreases, but after the table fills. The variable-length output
|
||||
// codes are re-sized at this point, and a special CLEAR code is generated
|
||||
// for the decompressor. Late addition: construct the table according to
|
||||
// file size for noticeable speed improvement on small files. Please direct
|
||||
// questions about this implementation to ames!jaw.
|
||||
|
||||
var g_init_bits;
|
||||
var ClearCode;
|
||||
var EOFCode;
|
||||
|
||||
// output
|
||||
// Output the given code.
|
||||
// Inputs:
|
||||
// code: A n_bits-bit integer. If == -1, then EOF. This assumes
|
||||
// that n_bits =< wordsize - 1.
|
||||
// Outputs:
|
||||
// Outputs code to the file.
|
||||
// Assumptions:
|
||||
// Chars are 8 bits long.
|
||||
// Algorithm:
|
||||
// Maintain a BITS character long buffer (so that 8 codes will
|
||||
// fit in it exactly). Use the VAX insv instruction to insert each
|
||||
// code in turn. When the buffer fills up empty it and start over.
|
||||
|
||||
var cur_accum = 0;
|
||||
var cur_bits = 0;
|
||||
var masks = [0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F, 0x00FF, 0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF];
|
||||
|
||||
// Number of characters so far in this 'packet'
|
||||
var a_count;
|
||||
|
||||
// Define the storage for the packet accumulator
|
||||
var accum = [];
|
||||
|
||||
var LZWEncoder = exports.LZWEncoder = function LZWEncoder(width, height, pixels, color_depth) {
|
||||
imgW = width;
|
||||
imgH = height;
|
||||
pixAry = pixels;
|
||||
initCodeSize = Math.max(2, color_depth);
|
||||
};
|
||||
|
||||
// Add a character to the end of the current packet, and if it is 254
|
||||
// characters, flush the packet to disk.
|
||||
var char_out = function char_out(c, outs) {
|
||||
accum[a_count++] = c;
|
||||
if (a_count >= 254) flush_char(outs);
|
||||
};
|
||||
|
||||
// Clear out the hash table
|
||||
// table clear for block compress
|
||||
|
||||
var cl_block = function cl_block(outs) {
|
||||
cl_hash(hsize);
|
||||
free_ent = ClearCode + 2;
|
||||
clear_flg = true;
|
||||
output(ClearCode, outs);
|
||||
};
|
||||
|
||||
// reset code table
|
||||
var cl_hash = function cl_hash(hsize) {
|
||||
for (var i = 0; i < hsize; ++i) htab[i] = -1;
|
||||
};
|
||||
|
||||
var compress = exports.compress = function compress(init_bits, outs) {
|
||||
|
||||
var fcode;
|
||||
var i; /* = 0 */
|
||||
var c;
|
||||
var ent;
|
||||
var disp;
|
||||
var hsize_reg;
|
||||
var hshift;
|
||||
|
||||
// Set up the globals: g_init_bits - initial number of bits
|
||||
g_init_bits = init_bits;
|
||||
|
||||
// Set up the necessary values
|
||||
clear_flg = false;
|
||||
n_bits = g_init_bits;
|
||||
maxcode = MAXCODE(n_bits);
|
||||
|
||||
ClearCode = 1 << (init_bits - 1);
|
||||
EOFCode = ClearCode + 1;
|
||||
free_ent = ClearCode + 2;
|
||||
|
||||
a_count = 0; // clear packet
|
||||
|
||||
ent = nextPixel();
|
||||
|
||||
hshift = 0;
|
||||
for (fcode = hsize; fcode < 65536; fcode *= 2)
|
||||
++hshift;
|
||||
hshift = 8 - hshift; // set hash code range bound
|
||||
|
||||
hsize_reg = hsize;
|
||||
cl_hash(hsize_reg); // clear hash table
|
||||
|
||||
output(ClearCode, outs);
|
||||
|
||||
outer_loop: while ((c = nextPixel()) != EOF) {
|
||||
fcode = (c << maxbits) + ent;
|
||||
i = (c << hshift) ^ ent; // xor hashing
|
||||
|
||||
if (htab[i] == fcode) {
|
||||
ent = codetab[i];
|
||||
continue;
|
||||
}
|
||||
|
||||
else if (htab[i] >= 0) { // non-empty slot
|
||||
|
||||
disp = hsize_reg - i; // secondary hash (after G. Knott)
|
||||
if (i === 0) disp = 1;
|
||||
|
||||
do {
|
||||
if ((i -= disp) < 0)
|
||||
i += hsize_reg;
|
||||
|
||||
if (htab[i] == fcode) {
|
||||
ent = codetab[i];
|
||||
continue outer_loop;
|
||||
}
|
||||
} while (htab[i] >= 0);
|
||||
}
|
||||
|
||||
output(ent, outs);
|
||||
ent = c;
|
||||
if (free_ent < maxmaxcode) {
|
||||
codetab[i] = free_ent++; // code -> hashtable
|
||||
htab[i] = fcode;
|
||||
}
|
||||
else cl_block(outs);
|
||||
}
|
||||
|
||||
// Put out the final code.
|
||||
output(ent, outs);
|
||||
output(EOFCode, outs);
|
||||
};
|
||||
|
||||
// ----------------------------------------------------------------------------
|
||||
var encode = exports.encode = function encode(os) {
|
||||
os.writeByte(initCodeSize); // write "initial code size" byte
|
||||
remaining = imgW * imgH; // reset navigation variables
|
||||
curPixel = 0;
|
||||
compress(initCodeSize + 1, os); // compress and write the pixel data
|
||||
os.writeByte(0); // write block terminator
|
||||
};
|
||||
|
||||
// Flush the packet to disk, and reset the accumulator
|
||||
var flush_char = function flush_char(outs) {
|
||||
if (a_count > 0) {
|
||||
outs.writeByte(a_count);
|
||||
outs.writeBytes(accum, 0, a_count);
|
||||
a_count = 0;
|
||||
}
|
||||
};
|
||||
|
||||
var MAXCODE = function MAXCODE(n_bits) {
|
||||
return (1 << n_bits) - 1;
|
||||
};
|
||||
|
||||
// ----------------------------------------------------------------------------
|
||||
// Return the next pixel from the image
|
||||
// ----------------------------------------------------------------------------
|
||||
|
||||
var nextPixel = function nextPixel() {
|
||||
if (remaining === 0) return EOF;
|
||||
--remaining;
|
||||
var pix = pixAry[curPixel++];
|
||||
return pix & 0xff;
|
||||
};
|
||||
|
||||
var output = function output(code, outs) {
|
||||
|
||||
cur_accum &= masks[cur_bits];
|
||||
|
||||
if (cur_bits > 0) cur_accum |= (code << cur_bits);
|
||||
else cur_accum = code;
|
||||
|
||||
cur_bits += n_bits;
|
||||
|
||||
while (cur_bits >= 8) {
|
||||
char_out((cur_accum & 0xff), outs);
|
||||
cur_accum >>= 8;
|
||||
cur_bits -= 8;
|
||||
}
|
||||
|
||||
// If the next entry is going to be too big for the code size,
|
||||
// then increase it, if possible.
|
||||
|
||||
if (free_ent > maxcode || clear_flg) {
|
||||
|
||||
if (clear_flg) {
|
||||
|
||||
maxcode = MAXCODE(n_bits = g_init_bits);
|
||||
clear_flg = false;
|
||||
|
||||
} else {
|
||||
|
||||
++n_bits;
|
||||
if (n_bits == maxbits) maxcode = maxmaxcode;
|
||||
else maxcode = MAXCODE(n_bits);
|
||||
}
|
||||
}
|
||||
|
||||
if (code == EOFCode) {
|
||||
|
||||
// At EOF, write the rest of the buffer.
|
||||
while (cur_bits > 0) {
|
||||
char_out((cur_accum & 0xff), outs);
|
||||
cur_accum >>= 8;
|
||||
cur_bits -= 8;
|
||||
}
|
||||
|
||||
flush_char(outs);
|
||||
}
|
||||
};
|
||||
|
||||
LZWEncoder.apply(this, arguments);
|
||||
return exports;
|
||||
};
|
529
samples/include/gif/NeuQuant.js
Normal file
529
samples/include/gif/NeuQuant.js
Normal file
|
@ -0,0 +1,529 @@
|
|||
/*
|
||||
* NeuQuant Neural-Net Quantization Algorithm
|
||||
* ------------------------------------------
|
||||
*
|
||||
* Copyright (c) 1994 Anthony Dekker
|
||||
*
|
||||
* NEUQUANT Neural-Net quantization algorithm by Anthony Dekker, 1994. See
|
||||
* "Kohonen neural networks for optimal colour quantization" in "Network:
|
||||
* Computation in Neural Systems" Vol. 5 (1994) pp 351-367. for a discussion of
|
||||
* the algorithm.
|
||||
*
|
||||
* Any party obtaining a copy of these files from the author, directly or
|
||||
* indirectly, is granted, free of charge, a full and unrestricted irrevocable,
|
||||
* world-wide, paid up, royalty-free, nonexclusive right and license to deal in
|
||||
* this software and documentation files (the "Software"), including without
|
||||
* limitation the rights to use, copy, modify, merge, publish, distribute,
|
||||
* sublicense, and/or sell copies of the Software, and to permit persons who
|
||||
* receive copies from any such party to do so, with the only requirement being
|
||||
* that this copyright notice remain intact.
|
||||
*/
|
||||
|
||||
/*
|
||||
* This class handles Neural-Net quantization algorithm
|
||||
* @author Kevin Weiner (original Java version - kweiner@fmsware.com)
|
||||
* @author Thibault Imbert (AS3 version - bytearray.org)
|
||||
* @author Kevin Kwok (JavaScript version - https://github.com/antimatter15/jsgif)
|
||||
* @version 0.1 AS3 implementation
|
||||
*/
|
||||
|
||||
NeuQuant = function() {
|
||||
|
||||
var exports = {};
|
||||
var netsize = 256; /* number of colours used */
|
||||
|
||||
/* four primes near 500 - assume no image has a length so large */
|
||||
/* that it is divisible by all four primes */
|
||||
|
||||
var prime1 = 499;
|
||||
var prime2 = 491;
|
||||
var prime3 = 487;
|
||||
var prime4 = 503;
|
||||
var minpicturebytes = (3 * prime4); /* minimum size for input image */
|
||||
|
||||
/*
|
||||
* Program Skeleton ---------------- [select samplefac in range 1..30] [read
|
||||
* image from input file] pic = (unsigned char*) malloc(3*width*height);
|
||||
* initnet(pic,3*width*height,samplefac); learn(); unbiasnet(); [write output
|
||||
* image header, using writecolourmap(f)] inxbuild(); write output image using
|
||||
* inxsearch(b,g,r)
|
||||
*/
|
||||
|
||||
/*
|
||||
* Network Definitions -------------------
|
||||
*/
|
||||
|
||||
var maxnetpos = (netsize - 1);
|
||||
var netbiasshift = 4; /* bias for colour values */
|
||||
var ncycles = 100; /* no. of learning cycles */
|
||||
|
||||
/* defs for freq and bias */
|
||||
var intbiasshift = 16; /* bias for fractions */
|
||||
var intbias = (1 << intbiasshift);
|
||||
var gammashift = 10; /* gamma = 1024 */
|
||||
var gamma = (1 << gammashift);
|
||||
var betashift = 10;
|
||||
var beta = (intbias >> betashift); /* beta = 1/1024 */
|
||||
var betagamma = (intbias << (gammashift - betashift));
|
||||
|
||||
/* defs for decreasing radius factor */
|
||||
var initrad = (netsize >> 3); /* for 256 cols, radius starts */
|
||||
var radiusbiasshift = 6; /* at 32.0 biased by 6 bits */
|
||||
var radiusbias = (1 << radiusbiasshift);
|
||||
var initradius = (initrad * radiusbias); /* and decreases by a */
|
||||
var radiusdec = 30; /* factor of 1/30 each cycle */
|
||||
|
||||
/* defs for decreasing alpha factor */
|
||||
var alphabiasshift = 10; /* alpha starts at 1.0 */
|
||||
var initalpha = (1 << alphabiasshift);
|
||||
var alphadec; /* biased by 10 bits */
|
||||
|
||||
/* radbias and alpharadbias used for radpower calculation */
|
||||
var radbiasshift = 8;
|
||||
var radbias = (1 << radbiasshift);
|
||||
var alpharadbshift = (alphabiasshift + radbiasshift);
|
||||
var alpharadbias = (1 << alpharadbshift);
|
||||
|
||||
/*
|
||||
* Types and Global Variables --------------------------
|
||||
*/
|
||||
|
||||
var thepicture; /* the input image itself */
|
||||
var lengthcount; /* lengthcount = H*W*3 */
|
||||
var samplefac; /* sampling factor 1..30 */
|
||||
|
||||
// typedef int pixel[4]; /* BGRc */
|
||||
var network; /* the network itself - [netsize][4] */
|
||||
var netindex = [];
|
||||
|
||||
/* for network lookup - really 256 */
|
||||
var bias = [];
|
||||
|
||||
/* bias and freq arrays for learning */
|
||||
var freq = [];
|
||||
var radpower = [];
|
||||
|
||||
var NeuQuant = exports.NeuQuant = function NeuQuant(thepic, len, sample) {
|
||||
|
||||
var i;
|
||||
var p;
|
||||
|
||||
thepicture = thepic;
|
||||
lengthcount = len;
|
||||
samplefac = sample;
|
||||
|
||||
network = new Array(netsize);
|
||||
|
||||
for (i = 0; i < netsize; i++) {
|
||||
|
||||
network[i] = new Array(4);
|
||||
p = network[i];
|
||||
p[0] = p[1] = p[2] = (i << (netbiasshift + 8)) / netsize;
|
||||
freq[i] = intbias / netsize; /* 1/netsize */
|
||||
bias[i] = 0;
|
||||
}
|
||||
};
|
||||
|
||||
var colorMap = function colorMap() {
|
||||
|
||||
var map = [];
|
||||
var index = new Array(netsize);
|
||||
|
||||
for (var i = 0; i < netsize; i++)
|
||||
index[network[i][3]] = i;
|
||||
|
||||
var k = 0;
|
||||
for (var l = 0; l < netsize; l++) {
|
||||
var j = index[l];
|
||||
map[k++] = (network[j][0]);
|
||||
map[k++] = (network[j][1]);
|
||||
map[k++] = (network[j][2]);
|
||||
}
|
||||
|
||||
return map;
|
||||
};
|
||||
|
||||
/*
|
||||
* Insertion sort of network and building of netindex[0..255] (to do after
|
||||
* unbias)
|
||||
* -------------------------------------------------------------------------------
|
||||
*/
|
||||
|
||||
var inxbuild = function inxbuild() {
|
||||
|
||||
var i;
|
||||
var j;
|
||||
var smallpos;
|
||||
var smallval;
|
||||
var p;
|
||||
var q;
|
||||
var previouscol;
|
||||
var startpos;
|
||||
|
||||
previouscol = 0;
|
||||
startpos = 0;
|
||||
for (i = 0; i < netsize; i++) {
|
||||
|
||||
p = network[i];
|
||||
smallpos = i;
|
||||
smallval = p[1]; /* index on g */
|
||||
|
||||
/* find smallest in i..netsize-1 */
|
||||
for (j = i + 1; j < netsize; j++) {
|
||||
|
||||
q = network[j];
|
||||
if (q[1] < smallval) { /* index on g */
|
||||
smallpos = j;
|
||||
smallval = q[1]; /* index on g */
|
||||
}
|
||||
}
|
||||
q = network[smallpos];
|
||||
|
||||
/* swap p (i) and q (smallpos) entries */
|
||||
if (i != smallpos) {
|
||||
j = q[0];
|
||||
q[0] = p[0];
|
||||
p[0] = j;
|
||||
j = q[1];
|
||||
q[1] = p[1];
|
||||
p[1] = j;
|
||||
j = q[2];
|
||||
q[2] = p[2];
|
||||
p[2] = j;
|
||||
j = q[3];
|
||||
q[3] = p[3];
|
||||
p[3] = j;
|
||||
}
|
||||
|
||||
/* smallval entry is now in position i */
|
||||
|
||||
if (smallval != previouscol) {
|
||||
|
||||
netindex[previouscol] = (startpos + i) >> 1;
|
||||
|
||||
for (j = previouscol + 1; j < smallval; j++) netindex[j] = i;
|
||||
|
||||
previouscol = smallval;
|
||||
startpos = i;
|
||||
}
|
||||
}
|
||||
|
||||
netindex[previouscol] = (startpos + maxnetpos) >> 1;
|
||||
for (j = previouscol + 1; j < 256; j++) netindex[j] = maxnetpos; /* really 256 */
|
||||
};
|
||||
|
||||
/*
|
||||
* Main Learning Loop ------------------
|
||||
*/
|
||||
|
||||
var learn = function learn() {
|
||||
|
||||
var i;
|
||||
var j;
|
||||
var b;
|
||||
var g;
|
||||
var r;
|
||||
var radius;
|
||||
var rad;
|
||||
var alpha;
|
||||
var step;
|
||||
var delta;
|
||||
var samplepixels;
|
||||
var p;
|
||||
var pix;
|
||||
var lim;
|
||||
|
||||
if (lengthcount < minpicturebytes) samplefac = 1;
|
||||
|
||||
alphadec = 30 + ((samplefac - 1) / 3);
|
||||
p = thepicture;
|
||||
pix = 0;
|
||||
lim = lengthcount;
|
||||
samplepixels = lengthcount / (3 * samplefac);
|
||||
delta = (samplepixels / ncycles) | 0;
|
||||
alpha = initalpha;
|
||||
radius = initradius;
|
||||
|
||||
rad = radius >> radiusbiasshift;
|
||||
if (rad <= 1) rad = 0;
|
||||
|
||||
for (i = 0; i < rad; i++) radpower[i] = alpha * (((rad * rad - i * i) * radbias) / (rad * rad));
|
||||
|
||||
if (lengthcount < minpicturebytes) step = 3;
|
||||
|
||||
else if ((lengthcount % prime1) !== 0) step = 3 * prime1;
|
||||
|
||||
else {
|
||||
|
||||
if ((lengthcount % prime2) !== 0) step = 3 * prime2;
|
||||
else {
|
||||
if ((lengthcount % prime3) !== 0) step = 3 * prime3;
|
||||
else step = 3 * prime4;
|
||||
}
|
||||
}
|
||||
|
||||
i = 0;
|
||||
while (i < samplepixels) {
|
||||
|
||||
b = (p[pix + 0] & 0xff) << netbiasshift;
|
||||
g = (p[pix + 1] & 0xff) << netbiasshift;
|
||||
r = (p[pix + 2] & 0xff) << netbiasshift;
|
||||
j = contest(b, g, r);
|
||||
|
||||
altersingle(alpha, j, b, g, r);
|
||||
if (rad !== 0) alterneigh(rad, j, b, g, r); /* alter neighbours */
|
||||
|
||||
pix += step;
|
||||
if (pix >= lim) pix -= lengthcount;
|
||||
|
||||
i++;
|
||||
|
||||
if (delta === 0) delta = 1;
|
||||
|
||||
if (i % delta === 0) {
|
||||
alpha -= alpha / alphadec;
|
||||
radius -= radius / radiusdec;
|
||||
rad = radius >> radiusbiasshift;
|
||||
|
||||
if (rad <= 1) rad = 0;
|
||||
|
||||
for (j = 0; j < rad; j++) radpower[j] = alpha * (((rad * rad - j * j) * radbias) / (rad * rad));
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
/*
|
||||
** Search for BGR values 0..255 (after net is unbiased) and return colour
|
||||
* index
|
||||
* ----------------------------------------------------------------------------
|
||||
*/
|
||||
|
||||
var map = exports.map = function map(b, g, r) {
|
||||
|
||||
var i;
|
||||
var j;
|
||||
var dist;
|
||||
var a;
|
||||
var bestd;
|
||||
var p;
|
||||
var best;
|
||||
|
||||
bestd = 1000; /* biggest possible dist is 256*3 */
|
||||
best = -1;
|
||||
i = netindex[g]; /* index on g */
|
||||
j = i - 1; /* start at netindex[g] and work outwards */
|
||||
|
||||
while ((i < netsize) || (j >= 0)) {
|
||||
|
||||
if (i < netsize) {
|
||||
p = network[i];
|
||||
dist = p[1] - g; /* inx key */
|
||||
|
||||
if (dist >= bestd) i = netsize; /* stop iter */
|
||||
|
||||
else {
|
||||
|
||||
i++;
|
||||
if (dist < 0) dist = -dist;
|
||||
a = p[0] - b;
|
||||
if (a < 0) a = -a;
|
||||
dist += a;
|
||||
|
||||
if (dist < bestd) {
|
||||
a = p[2] - r;
|
||||
if (a < 0) a = -a;
|
||||
dist += a;
|
||||
|
||||
if (dist < bestd) {
|
||||
bestd = dist;
|
||||
best = p[3];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (j >= 0) {
|
||||
|
||||
p = network[j];
|
||||
dist = g - p[1]; /* inx key - reverse dif */
|
||||
|
||||
if (dist >= bestd) j = -1; /* stop iter */
|
||||
|
||||
else {
|
||||
|
||||
j--;
|
||||
if (dist < 0) dist = -dist;
|
||||
a = p[0] - b;
|
||||
if (a < 0) a = -a;
|
||||
dist += a;
|
||||
|
||||
if (dist < bestd) {
|
||||
a = p[2] - r;
|
||||
if (a < 0) a = -a;
|
||||
dist += a;
|
||||
if (dist < bestd) {
|
||||
bestd = dist;
|
||||
best = p[3];
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return (best);
|
||||
};
|
||||
|
||||
var process = exports.process = function process() {
|
||||
learn();
|
||||
unbiasnet();
|
||||
inxbuild();
|
||||
return colorMap();
|
||||
};
|
||||
|
||||
/*
|
||||
* Unbias network to give byte values 0..255 and record position i to prepare
|
||||
* for sort
|
||||
* -----------------------------------------------------------------------------------
|
||||
*/
|
||||
|
||||
var unbiasnet = function unbiasnet() {
|
||||
|
||||
var i;
|
||||
var j;
|
||||
|
||||
for (i = 0; i < netsize; i++) {
|
||||
network[i][0] >>= netbiasshift;
|
||||
network[i][1] >>= netbiasshift;
|
||||
network[i][2] >>= netbiasshift;
|
||||
network[i][3] = i; /* record colour no */
|
||||
}
|
||||
};
|
||||
|
||||
/*
|
||||
* Move adjacent neurons by precomputed alpha*(1-((i-j)^2/[r]^2)) in
|
||||
* radpower[|i-j|]
|
||||
* ---------------------------------------------------------------------------------
|
||||
*/
|
||||
|
||||
var alterneigh = function alterneigh(rad, i, b, g, r) {
|
||||
|
||||
var j;
|
||||
var k;
|
||||
var lo;
|
||||
var hi;
|
||||
var a;
|
||||
var m;
|
||||
var p;
|
||||
|
||||
lo = i - rad;
|
||||
if (lo < -1) lo = -1;
|
||||
|
||||
hi = i + rad;
|
||||
if (hi > netsize) hi = netsize;
|
||||
|
||||
j = i + 1;
|
||||
k = i - 1;
|
||||
m = 1;
|
||||
|
||||
while ((j < hi) || (k > lo)) {
|
||||
a = radpower[m++];
|
||||
|
||||
if (j < hi) {
|
||||
p = network[j++];
|
||||
|
||||
try {
|
||||
p[0] -= (a * (p[0] - b)) / alpharadbias;
|
||||
p[1] -= (a * (p[1] - g)) / alpharadbias;
|
||||
p[2] -= (a * (p[2] - r)) / alpharadbias;
|
||||
} catch (e) {} // prevents 1.3 miscompilation
|
||||
}
|
||||
|
||||
if (k > lo) {
|
||||
p = network[k--];
|
||||
|
||||
try {
|
||||
p[0] -= (a * (p[0] - b)) / alpharadbias;
|
||||
p[1] -= (a * (p[1] - g)) / alpharadbias;
|
||||
p[2] -= (a * (p[2] - r)) / alpharadbias;
|
||||
} catch (e) {}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
/*
|
||||
* Move neuron i towards biased (b,g,r) by factor alpha
|
||||
* ----------------------------------------------------
|
||||
*/
|
||||
|
||||
var altersingle = function altersingle(alpha, i, b, g, r) {
|
||||
|
||||
/* alter hit neuron */
|
||||
var n = network[i];
|
||||
n[0] -= (alpha * (n[0] - b)) / initalpha;
|
||||
n[1] -= (alpha * (n[1] - g)) / initalpha;
|
||||
n[2] -= (alpha * (n[2] - r)) / initalpha;
|
||||
};
|
||||
|
||||
/*
|
||||
* Search for biased BGR values ----------------------------
|
||||
*/
|
||||
|
||||
var contest = function contest(b, g, r) {
|
||||
|
||||
/* finds closest neuron (min dist) and updates freq */
|
||||
/* finds best neuron (min dist-bias) and returns position */
|
||||
/* for frequently chosen neurons, freq[i] is high and bias[i] is negative */
|
||||
/* bias[i] = gamma*((1/netsize)-freq[i]) */
|
||||
|
||||
var i;
|
||||
var dist;
|
||||
var a;
|
||||
var biasdist;
|
||||
var betafreq;
|
||||
var bestpos;
|
||||
var bestbiaspos;
|
||||
var bestd;
|
||||
var bestbiasd;
|
||||
var n;
|
||||
|
||||
bestd = ~ (1 << 31);
|
||||
bestbiasd = bestd;
|
||||
bestpos = -1;
|
||||
bestbiaspos = bestpos;
|
||||
|
||||
for (i = 0; i < netsize; i++) {
|
||||
n = network[i];
|
||||
dist = n[0] - b;
|
||||
if (dist < 0) dist = -dist;
|
||||
a = n[1] - g;
|
||||
if (a < 0) a = -a;
|
||||
dist += a;
|
||||
a = n[2] - r;
|
||||
if (a < 0) a = -a;
|
||||
dist += a;
|
||||
|
||||
if (dist < bestd) {
|
||||
bestd = dist;
|
||||
bestpos = i;
|
||||
}
|
||||
|
||||
biasdist = dist - ((bias[i]) >> (intbiasshift - netbiasshift));
|
||||
|
||||
if (biasdist < bestbiasd) {
|
||||
bestbiasd = biasdist;
|
||||
bestbiaspos = i;
|
||||
}
|
||||
|
||||
betafreq = (freq[i] >> betashift);
|
||||
freq[i] -= betafreq;
|
||||
bias[i] += (betafreq << gammashift);
|
||||
}
|
||||
|
||||
freq[bestpos] += beta;
|
||||
bias[bestpos] -= betagamma;
|
||||
return (bestbiaspos);
|
||||
};
|
||||
|
||||
NeuQuant.apply(this, arguments);
|
||||
return exports;
|
||||
};
|
Loading…
Reference in a new issue