Remove older revision of webgl conformance tests.

conformance/resources/pnglib.js

-/**
-* A handy class to calculate color values.
-*
-* @version 1.0
-* @author Robert Eisele <robert@xarg.org>
-* @copyright Copyright (c) 2010, Robert Eisele
-* @link http://www.xarg.org/2010/03/generate-client-side-png-files-using-javascript/
-* @license http://www.opensource.org/licenses/bsd-license.php BSD License
-*
-*/
-
-(function() {
-
-    // helper functions for that ctx
-    function write(buffer, offs) {
-        for (var i = 2; i < arguments.length; i++) {
-            for (var j = 0; j < arguments[i].length; j++) {
-                buffer[offs++] = arguments[i].charAt(j);
-            }
-        }
-    }
-
-    function byte2(w) {
-        return String.fromCharCode((w >> 8) & 255, w & 255);
-    }
-
-    function byte4(w) {
-        return String.fromCharCode((w >> 24) & 255, (w >> 16) & 255, (w >> 8) & 255, w & 255);
-    }
-
-    function byte2lsb(w) {
-        return String.fromCharCode(w & 255, (w >> 8) & 255);
-    }
-
-    window.PNGlib = function(width,height,depth) {
-
-        this.width   = width;
-        this.height  = height;
-        this.depth   = depth;
-
-        // pixel data and row filter identifier size
-        this.pix_size = height * (width + 1);
-
-        // deflate header, pix_size, block headers, adler32 checksum
-        this.data_size = 2 + this.pix_size + 5 * Math.floor((0xfffe + this.pix_size) / 0xffff) + 4;
-
-        // offsets and sizes of Png chunks
-        this.ihdr_offs = 0;                                    // IHDR offset and size
-        this.ihdr_size = 4 + 4 + 13 + 4;
-        this.plte_offs = this.ihdr_offs + this.ihdr_size;    // PLTE offset and size
-        this.plte_size = 4 + 4 + 3 * depth + 4;
-        this.trns_offs = this.plte_offs + this.plte_size;    // tRNS offset and size
-        this.trns_size = 4 + 4 + depth + 4;
-        this.idat_offs = this.trns_offs + this.trns_size;    // IDAT offset and size
-        this.idat_size = 4 + 4 + this.data_size + 4;
-        this.iend_offs = this.idat_offs + this.idat_size;    // IEND offset and size
-        this.iend_size = 4 + 4 + 4;
-        this.buffer_size  = this.iend_offs + this.iend_size;    // total PNG size
-
-        this.buffer  = new Array();
-        this.palette = new Object();
-        this.pindex  = 0;
-
-        var _crc32 = new Array();
-
-        // initialize buffer with zero bytes
-        for (var i = 0; i < this.buffer_size; i++) {
-            this.buffer[i] = "\x00";
-        }
-
-        // initialize non-zero elements
-        write(this.buffer, this.ihdr_offs, byte4(this.ihdr_size - 12), 'IHDR', byte4(width), byte4(height), "\x08\x03");
-        write(this.buffer, this.plte_offs, byte4(this.plte_size - 12), 'PLTE');
-        write(this.buffer, this.trns_offs, byte4(this.trns_size - 12), 'tRNS');
-        write(this.buffer, this.idat_offs, byte4(this.idat_size - 12), 'IDAT');
-        write(this.buffer, this.iend_offs, byte4(this.iend_size - 12), 'IEND');
-
-        // initialize deflate header
-        var header = ((8 + (7 << 4)) << 8) | (3 << 6);
-        header+= 31 - (header % 31);
-
-        write(this.buffer, this.idat_offs + 8, byte2(header));
-
-        // initialize deflate block headers
-        for (var i = 0; (i << 16) - 1 < this.pix_size; i++) {
-            var size, bits;
-            if (i + 0xffff < this.pix_size) {
-                size = 0xffff;
-                bits = "\x00";
-            } else {
-                size = this.pix_size - (i << 16) - i;
-                bits = "\x01";
-            }
-            write(this.buffer, this.idat_offs + 8 + 2 + (i << 16) + (i << 2), bits, byte2lsb(size), byte2lsb(~size));
-        }
-
-        /* Create crc32 lookup table */
-        for (var i = 0; i < 256; i++) {
-            var c = i;
-            for (var j = 0; j < 8; j++) {
-                if (c & 1) {
-                    c = -306674912 ^ ((c >> 1) & 0x7fffffff);
-                } else {
-                    c = (c >> 1) & 0x7fffffff;
-                }
-            }
-            _crc32[i] = c;
-        }
-
-        // compute the index into a png for a given pixel
-        this.index = function(x,y) {
-            var i = y * (this.width + 1) + x + 1;
-            var j = this.idat_offs + 8 + 2 + 5 * Math.floor((i / 0xffff) + 1) + i;
-            return j;
-        }
-
-        // convert a color and build up the palette
-        this.color = function(red, green, blue, alpha) {
-
-            alpha = alpha >= 0 ? alpha : 255;
-            var color = (((((alpha << 8) | red) << 8) | green) << 8) | blue;
-
-            if (typeof this.palette[color] == "undefined") {
-                if (this.pindex == this.depth) return "\x00";
-
-                var ndx = this.plte_offs + 8 + 3 * this.pindex;
-
-                this.buffer[ndx + 0] = String.fromCharCode(red);
-                this.buffer[ndx + 1] = String.fromCharCode(green);
-                this.buffer[ndx + 2] = String.fromCharCode(blue);
-                this.buffer[this.trns_offs+8+this.pindex] = String.fromCharCode(alpha);
-
-                this.palette[color] = String.fromCharCode(this.pindex++);
-            }
-            return this.palette[color];
-        }
-
-        // output a PNG string, Base64 encoded
-        this.getBase64 = function() {
-
-            var s = this.getDump();
-
-            var ch = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
-            var c1, c2, c3, e1, e2, e3, e4;
-            var l = s.length;
-            var i = 0;
-            var r = "";
-
-            do {
-                c1 = s.charCodeAt(i);
-                e1 = c1 >> 2;
-                c2 = s.charCodeAt(i+1);
-                e2 = ((c1 & 3) << 4) | (c2 >> 4);
-                c3 = s.charCodeAt(i+2);
-                if (l < i+2) { e3 = 64; } else { e3 = ((c2 & 0xf) << 2) | (c3 >> 6); }
-                if (l < i+3) { e4 = 64; } else { e4 = c3 & 0x3f; }
-                r+= ch.charAt(e1) + ch.charAt(e2) + ch.charAt(e3) + ch.charAt(e4);
-            } while ((i+= 3) < l);
-            return r;
-        }
-
-        // output a PNG string
-        this.getDump = function() {
-
-            // compute adler32 of output pixels + row filter bytes
-            var BASE = 65521; /* largest prime smaller than 65536 */
-            var NMAX = 5552;  /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
-            var s1 = 1;
-            var s2 = 0;
-            var n = NMAX;
-
-            for (var y = 0; y < this.height; y++) {
-                for (var x = -1; x < this.width; x++) {
-                    s1+= this.buffer[this.index(x, y)].charCodeAt(0);
-                    s2+= s1;
-                    if ((n-= 1) == 0) {
-                        s1%= BASE;
-                        s2%= BASE;
-                        n = NMAX;
-                    }
-                }
-            }
-            s1%= BASE;
-            s2%= BASE;
-            write(this.buffer, this.idat_offs + this.idat_size - 8, byte4((s2 << 16) | s1));
-
-            // compute crc32 of the PNG chunks
-            function crc32(png, offs, size) {
-                var crc = -1;
-                for (var i = 4; i < size-4; i += 1) {
-                    crc = _crc32[(crc ^ png[offs+i].charCodeAt(0)) & 0xff] ^ ((crc >> 8) & 0x00ffffff);
-                }
-                write(png, offs+size-4, byte4(crc ^ -1));
-            }
-
-            crc32(this.buffer, this.ihdr_offs, this.ihdr_size);
-            crc32(this.buffer, this.plte_offs, this.plte_size);
-            crc32(this.buffer, this.trns_offs, this.trns_size);
-            crc32(this.buffer, this.idat_offs, this.idat_size);
-            crc32(this.buffer, this.iend_offs, this.iend_size);
-
-            // convert PNG to string
-            return "\211PNG\r\n\032\n"+this.buffer.join('');
-        }
-    }
-
-})();