Kemonogen komplett überarbeitet

kemonogen/canvas-toBlob.js

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+/* canvas-toBlob.js
+ * A canvas.toBlob() implementation.
+ * 2016-05-26
+ * 
+ * By Eli Grey, http://eligrey.com and Devin Samarin, https://github.com/eboyjr
+ * License: MIT
+ *   See https://github.com/eligrey/canvas-toBlob.js/blob/master/LICENSE.md
+ */
+
+/*global self */
+/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
+  plusplus: true */
+
+/*! @source http://purl.eligrey.com/github/canvas-toBlob.js/blob/master/canvas-toBlob.js */
+
+(function(view) {
+"use strict";
+var
+	  Uint8Array = view.Uint8Array
+	, HTMLCanvasElement = view.HTMLCanvasElement
+	, canvas_proto = HTMLCanvasElement && HTMLCanvasElement.prototype
+	, is_base64_regex = /\s*;\s*base64\s*(?:;|$)/i
+	, to_data_url = "toDataURL"
+	, base64_ranks
+	, decode_base64 = function(base64) {
+		var
+			  len = base64.length
+			, buffer = new Uint8Array(len / 4 * 3 | 0)
+			, i = 0
+			, outptr = 0
+			, last = [0, 0]
+			, state = 0
+			, save = 0
+			, rank
+			, code
+			, undef
+		;
+		while (len--) {
+			code = base64.charCodeAt(i++);
+			rank = base64_ranks[code-43];
+			if (rank !== 255 && rank !== undef) {
+				last[1] = last[0];
+				last[0] = code;
+				save = (save << 6) | rank;
+				state++;
+				if (state === 4) {
+					buffer[outptr++] = save >>> 16;
+					if (last[1] !== 61 /* padding character */) {
+						buffer[outptr++] = save >>> 8;
+					}
+					if (last[0] !== 61 /* padding character */) {
+						buffer[outptr++] = save;
+					}
+					state = 0;
+				}
+			}
+		}
+		// 2/3 chance there's going to be some null bytes at the end, but that
+		// doesn't really matter with most image formats.
+		// If it somehow matters for you, truncate the buffer up outptr.
+		return buffer;
+	}
+;
+if (Uint8Array) {
+	base64_ranks = new Uint8Array([
+		  62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1
+		, -1, -1,  0, -1, -1, -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9
+		, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25
+		, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35
+		, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
+	]);
+}
+if (HTMLCanvasElement && (!canvas_proto.toBlob || !canvas_proto.toBlobHD)) {
+	if (!canvas_proto.toBlob)
+	canvas_proto.toBlob = function(callback, type /*, ...args*/) {
+		  if (!type) {
+			type = "image/png";
+		} if (this.mozGetAsFile) {
+			callback(this.mozGetAsFile("canvas", type));
+			return;
+		} if (this.msToBlob && /^\s*image\/png\s*(?:$|;)/i.test(type)) {
+			callback(this.msToBlob());
+			return;
+		}
+
+		var
+			  args = Array.prototype.slice.call(arguments, 1)
+			, dataURI = this[to_data_url].apply(this, args)
+			, header_end = dataURI.indexOf(",")
+			, data = dataURI.substring(header_end + 1)
+			, is_base64 = is_base64_regex.test(dataURI.substring(0, header_end))
+			, blob
+		;
+		if (Blob.fake) {
+			// no reason to decode a data: URI that's just going to become a data URI again
+			blob = new Blob
+			if (is_base64) {
+				blob.encoding = "base64";
+			} else {
+				blob.encoding = "URI";
+			}
+			blob.data = data;
+			blob.size = data.length;
+		} else if (Uint8Array) {
+			if (is_base64) {
+				blob = new Blob([decode_base64(data)], {type: type});
+			} else {
+				blob = new Blob([decodeURIComponent(data)], {type: type});
+			}
+		}
+		callback(blob);
+	};
+
+	if (!canvas_proto.toBlobHD && canvas_proto.toDataURLHD) {
+		canvas_proto.toBlobHD = function() {
+			to_data_url = "toDataURLHD";
+			var blob = this.toBlob();
+			to_data_url = "toDataURL";
+			return blob;
+		}
+	} else {
+		canvas_proto.toBlobHD = canvas_proto.toBlob;
+	}
+}
+}(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this));