119 lines
4.0 KiB
JavaScript
119 lines
4.0 KiB
JavaScript
/* jslint moz: true, bitwise: true */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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(function(){
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"use strict";
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function getFakeCanvas(window, original){
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var context = window.HTMLCanvasElement.prototype.getContext.call(original, "2d");
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var imageData, data, source;
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if (context){
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imageData = window.CanvasRenderingContext2D.prototype.getImageData.call(context, 0, 0, original.width, original.height);
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source = imageData.data;
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}
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else {
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context =
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window.HTMLCanvasElement.prototype.getContext.call(original, "webgl") ||
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window.HTMLCanvasElement.prototype.getContext.call(original, "experimental-webgl") ||
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window.HTMLCanvasElement.prototype.getContext.call(original, "webgl2") ||
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window.HTMLCanvasElement.prototype.getContext.call(original, "experimental-webgl2");
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imageData = context.createImageData(original.width, original.height);
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source = new window.wrappedJSObject.Uint8Array(imageData.data.length);
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window.WebGLRenderingContext.prototype.readPixels.call(
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context,
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0, 0, original.width, original.height,
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context.RGBA, context.UNSIGNED_BYTE,
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source
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);
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}
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var data = imageData.data;
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for (var i = 0, l = data.length; i < l; i += 1){
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var value = source[i];
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if (value >= 0x80){
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value = value ^ Math.floor(Math.random() * 0x20);
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}
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else if (value >= 0x40){
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value = value ^ Math.floor(Math.random() * 0x10);
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}
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else if (value >= 0x20){
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value = value ^ Math.floor(Math.random() * 0x08);
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}
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else if (value >= 0x10){
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value = value ^ Math.floor(Math.random() * 0x04);
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}
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else if (value >= 0x08){
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value = value ^ Math.floor(Math.random() * 0x02);
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}
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else if (value >= 0x04){
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value = value ^ Math.floor(Math.random() * 0x01);
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}
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data[i] = value;
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}
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var canvas = original.cloneNode(true);
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context = window.HTMLCanvasElement.prototype.getContext.call(canvas, "2d");
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context.putImageData(imageData, 0, 0);
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return canvas;
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}
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function getWindow(canvas){
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return canvas.ownerDocument.defaultView;
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}
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// changed functions and their fakes
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exports.changedFunctions = {
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getContext: {
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type: "context",
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object: "HTMLCanvasElement"
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},
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toDataURL: {
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type: "readout",
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object: "HTMLCanvasElement",
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fake: function toDataURL(){
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var window = getWindow(this);
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return window.HTMLCanvasElement.prototype.toDataURL.apply(getFakeCanvas(window, this), arguments);
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}
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},
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toBlob: {
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type: "readout",
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object: "HTMLCanvasElement",
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fake: function toBlob(callback){
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var window = getWindow(this);
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return window.HTMLCanvasElement.prototype.toBlob.apply(getFakeCanvas(window, this), arguments);
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},
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exportOptions: {allowCallbacks: true}
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},
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mozGetAsFile: {
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type: "readout",
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object: "HTMLCanvasElement",
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mozGetAsFile: function mozGetAsFile(callbak){
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var window = getWindow(this);
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return window.HTMLCanvasElement.prototype.mozGetAsFile.apply(getFakeCanvas(window, this), arguments);
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}
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},
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getImageData: {
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type: "readout",
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object: "CanvasRenderingContext2D",
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fake: function getImageData(sx, sy, sw, sh){
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var window = getWindow(this.canvas);
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var context = window.HTMLCanvasElement.prototype.getContext.call(getFakeCanvas(window, this.canvas), "2d");
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var data = window.CanvasRenderingContext2D.prototype.getImageData.apply(context, arguments).data;
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var imageData = context.createImageData(sw, sh);
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for (var i = 0, l = data.length; i < l; i += 1){
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imageData.data[i] = data[i];
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}
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return imageData;
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}
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},
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readPixels: {
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type: "readout",
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object: "WebGLRenderingContext",
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fake: function readPixels(x, y, width, height, format, type, pixels){
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var window = getWindow(this.canvas);
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var context = window.HTMLCanvasElement.prototype.getContext.call(getFakeCanvas(window, this.canvas), "webGL");
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return window.WebGLRenderingContext.prototype.readPixels.apply(context, arguments);
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}
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}
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};
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}()); |