From 346f3a9817b1e0812565396b9811a1ce5adc97b8 Mon Sep 17 00:00:00 2001 From: jules Date: Fri, 13 Dec 2013 15:28:31 -0500 Subject: reorganize --- gif-encode/GIFEncoder.js | 513 ----------------------------------------------- 1 file changed, 513 deletions(-) delete mode 100755 gif-encode/GIFEncoder.js (limited to 'gif-encode/GIFEncoder.js') diff --git a/gif-encode/GIFEncoder.js b/gif-encode/GIFEncoder.js deleted file mode 100755 index 01d3618..0000000 --- a/gif-encode/GIFEncoder.js +++ /dev/null @@ -1,513 +0,0 @@ -/** -* 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) -* @version 0.1 AS3 implementation -*/ - -//import flash.utils.ByteArray; -//import flash.display.BitmapData; -//import flash.display.Bitmap; -//import org.bytearray.gif.encoder.NeuQuant -//import flash.net.URLRequestHeader; -//import flash.net.URLRequestMethod; -//import flash.net.URLRequest; -//import flash.net.navigateToURL; - -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/*int*/ // image size - var height/*int*/; - var transparent/***/ = null; // transparent color if given - var transIndex/*int*/; // transparent index in color table - var repeat/*int*/ = -1; // no repeat - var delay/*int*/ = 0; // frame delay (hundredths) - var started/*Boolean*/ = false; // ready to output frames - var out/*ByteArray*/; - var image/*Bitmap*/; // current frame - var pixels/*ByteArray*/; // BGR byte array from frame - var indexedPixels/*ByteArray*/ // converted frame indexed to palette - var colorDepth/*int*/; // number of bit planes - var colorTab/*ByteArray*/; // RGB palette - var usedEntry/*Array*/ = new Array; // active palette entries - var palSize/*int*/ = 7; // color table size (bits-1) - var dispose/*int*/ = -1; // disposal code (-1 = use default) - var closeStream/*Boolean*/ = false; // close stream when finished - var firstFrame/*Boolean*/ = true; - var sizeSet/*Boolean*/ = false; // if false, get size from first frame - var sample/*int*/ = 1; // default sample interval for quantizer - var neuquantBrain = null; // allow loading in a prefab neural net - - /** - * 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/*int*/) { - 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/*int*/) { - 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/*int*/) { - 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/*Number*/) { - transparent = c; - } - - /** - * The addFrame method takes an incoming BitmapData object to create each frames - * @param - * BitmapData object to be treated as a GIF's frame - */ - - /*Boolean*/ - var addFrame = exports.addFrame = function addFrame(im/*BitmapData*/, is_imageData) { - if ((im == null) || ! started || out == null) { - throw new Error ("Please call start method before calling addFrame"); - return false; - } - - var ok/*Boolean*/ = 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 { - image = im; - } - 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 - writeImageDesc(); // image descriptor - if (!firstFrame) { - writePalette(); // local color table - } - writePixels(); // encode and write pixel data - firstFrame = false; - } - catch (e/*Error*/) { - ok = false; - } - return ok; - } - - /** - * Adds final trailer to the GIF stream, if you don't call the finish method - * the GIF stream will not be valid. - */ - - /*Boolean*/ - var finish = exports.finish = function finish() { - if ( ! started) { - return false; - } - - var ok/*Boolean*/ = true; - started = false; - try { - out.writeByte(0x3b); // gif trailer - } - catch (e/*Error*/) { - 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 - * setDelay(1000/fps). - * @param fps - * float frame rate (frames per second) - */ - - var setFrameRate = exports.setFrameRate = function setFrameRate(fps/*Number*/) { - 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/*int*/) { - sample = Math.max(1, 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/*int*/, h/*int*/) { - if (started && !firstFrame) { - return; - } - width = w; - height = h; - if (width < 1) width = 320; - if (height < 1) height = 240; - sizeSet = true; - } - - /** - * After running the Neuquant on some test frames, it can be exported and then loaded - * into an uninitialized NQ instance on another worker and used accordingly. - */ - var setNeuquant = exports.setNeuquant = function setNeuquant(neuquant, colors){ - neuquantBrain = neuquant; - colorTab = colors; - } - - /** - * 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/*Boolean*/ = true; - closeStream = false; - out = new ByteArray; - try { - out.writeUTFBytes("GIF89a"); // header - } catch (e/*Error*/) { - 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 = []; - // initialize quantizer - - var nq; - if (neuquantBrain && colorTab) { - nq = new NeuQuant(); - nq.load(neuquantBrain); - } - else { - nq = new NeuQuant (pixels, len, sample); - 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/*Number*/) { - 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/*int*/ = 0; - - for ( var i/*int*/ = 0; i < h; i++ ) { - for (var j/*int*/ = 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/*int*/ - var disp/*int*/; - 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 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/*int*/ = (3 * 256) - colorTab.length; - for (var i/*int*/ = 0; i < n; i++) { - out.writeByte(0); - } - } - - var WriteShort = function WriteShort (pValue/*int*/) { - 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; -} - -- cgit v1.2.3-70-g09d2