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File: vendors/echarts/test/ut/lib/imagediff.js

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File: vendors/echarts/test/ut/lib/imagediff.js
Role: Auxiliary data
Content type: text/plain
Description: Auxiliary data
Class: Gentelella BladeOne
Render templates using Bootstrap for presentation
Author: By
Last change:
Date: 3 years ago
Size: 10,177 bytes
 

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(function (name, definition) { var root = this; if (typeof module !== 'undefined') { var Canvas; try { Canvas = require('canvas'); } catch (e) {} module.exports = definition(root, name, Canvas); } else if (typeof define === 'function' && typeof define.amd === 'object') { define(definition(root, name)); } else { root[name] = definition(root, name); } })('imagediff', function (root, name, Canvas) { var TYPE_ARRAY = /\[object Array\]/i, TYPE_CANVAS = /\[object (Canvas|HTMLCanvasElement)\]/i, TYPE_CONTEXT = /\[object CanvasRenderingContext2D\]/i, TYPE_IMAGE = /\[object (Image|HTMLImageElement)\]/i, TYPE_IMAGE_DATA = /\[object ImageData\]/i, UNDEFINED = 'undefined', canvas = getCanvas(), context = canvas.getContext('2d'), previous = root[name], imagediff, jasmine; // Creation function getCanvas (width, height) { var canvas; if (Canvas) { canvas = new Canvas(); } else if (root.document && root.document.createElement) { canvas = document.createElement('canvas'); } else { throw new Error( e.message + '\n' + 'Please see https://github.com/HumbleSoftware/js-imagediff#cannot-find-module-canvas\n' ); } if (width) canvas.width = width; if (height) canvas.height = height; return canvas; } function getImageData (width, height) { canvas.width = width; canvas.height = height; context.clearRect(0, 0, width, height); return context.createImageData(width, height); } // Type Checking function isImage (object) { return isType(object, TYPE_IMAGE); } function isCanvas (object) { return isType(object, TYPE_CANVAS); } function isContext (object) { return isType(object, TYPE_CONTEXT); } function isImageData (object) { return !!(object && isType(object, TYPE_IMAGE_DATA) && typeof(object.width) !== UNDEFINED && typeof(object.height) !== UNDEFINED && typeof(object.data) !== UNDEFINED); } function isImageType (object) { return ( isImage(object) || isCanvas(object) || isContext(object) || isImageData(object) ); } function isType (object, type) { return typeof (object) === 'object' && !!Object.prototype.toString.apply(object).match(type); } // Type Conversion function copyImageData (imageData) { var height = imageData.height, width = imageData.width, data = imageData.data, newImageData, newData, i; canvas.width = width; canvas.height = height; newImageData = context.getImageData(0, 0, width, height); newData = newImageData.data; for (i = imageData.data.length; i--;) { newData[i] = data[i]; } return newImageData; } function toImageData (object) { if (isImage(object)) { return toImageDataFromImage(object); } if (isCanvas(object)) { return toImageDataFromCanvas(object); } if (isContext(object)) { return toImageDataFromContext(object); } if (isImageData(object)) { return object; } } function toImageDataFromImage (image) { var height = image.height, width = image.width; canvas.width = width; canvas.height = height; context.clearRect(0, 0, width, height); context.drawImage(image, 0, 0); return context.getImageData(0, 0, width, height); } function toImageDataFromCanvas (canvas) { var height = canvas.height, width = canvas.width, context = canvas.getContext('2d'); return context.getImageData(0, 0, width, height); } function toImageDataFromContext (context) { var canvas = context.canvas, height = canvas.height, width = canvas.width; return context.getImageData(0, 0, width, height); } function toCanvas (object) { var data = toImageData(object), canvas = getCanvas(data.width, data.height), context = canvas.getContext('2d'); context.putImageData(data, 0, 0); return canvas; } // ImageData Equality Operators function equalWidth (a, b) { return a.width === b.width; } function equalHeight (a, b) { return a.height === b.height; } function equalDimensions (a, b) { return equalHeight(a, b) && equalWidth(a, b); } function equal (a, b, tolerance) { var aData = a.data, bData = b.data, length = aData.length, i; tolerance = tolerance || 0; if (!equalDimensions(a, b)) return false; for (i = length; i--;) if (aData[i] !== bData[i] && Math.abs(aData[i] - bData[i]) > tolerance) return false; return true; } // Diff function diff (a, b, options) { return (equalDimensions(a, b) ? diffEqual : diffUnequal)(a, b, options); } function diffEqual (a, b, options) { var height = a.height, width = a.width, c = getImageData(width, height), // c = a - b aData = a.data, bData = b.data, cData = c.data, length = cData.length, row, column, i, j, k, v; for (i = 0; i < length; i += 4) { cData[i] = Math.abs(aData[i] - bData[i]); cData[i+1] = Math.abs(aData[i+1] - bData[i+1]); cData[i+2] = Math.abs(aData[i+2] - bData[i+2]); cData[i+3] = Math.abs(255 - Math.abs(aData[i+3] - bData[i+3])); } return c; } function diffUnequal (a, b, options) { var height = Math.max(a.height, b.height), width = Math.max(a.width, b.width), c = getImageData(width, height), // c = a - b aData = a.data, bData = b.data, cData = c.data, align = options && options.align, rowOffset, columnOffset, row, column, i, j, k, v; for (i = cData.length - 1; i > 0; i = i - 4) { cData[i] = 255; } // Add First Image offsets(a); for (row = a.height; row--;){ for (column = a.width; column--;) { i = 4 * ((row + rowOffset) * width + (column + columnOffset)); j = 4 * (row * a.width + column); cData[i+0] = aData[j+0]; // r cData[i+1] = aData[j+1]; // g cData[i+2] = aData[j+2]; // b // cData[i+3] = aData[j+3]; // a } } // Subtract Second Image offsets(b); for (row = b.height; row--;){ for (column = b.width; column--;) { i = 4 * ((row + rowOffset) * width + (column + columnOffset)); j = 4 * (row * b.width + column); cData[i+0] = Math.abs(cData[i+0] - bData[j+0]); // r cData[i+1] = Math.abs(cData[i+1] - bData[j+1]); // g cData[i+2] = Math.abs(cData[i+2] - bData[j+2]); // b } } // Helpers function offsets (imageData) { if (align === 'top') { rowOffset = 0; columnOffset = 0; } else { rowOffset = Math.floor((height - imageData.height) / 2); columnOffset = Math.floor((width - imageData.width) / 2); } } return c; } // Validation function checkType () { var i; for (i = 0; i < arguments.length; i++) { if (!isImageType(arguments[i])) { throw { name : 'ImageTypeError', message : 'Submitted object was not an image.' }; } } } // Jasmine Matchers function get (element, content) { element = document.createElement(element); if (element && content) { element.innerHTML = content; } return element; } jasmine = { toBeImageData : function () { return imagediff.isImageData(this.actual); }, toImageDiffEqual : function (expected, tolerance) { if (typeof (document) !== UNDEFINED) { this.message = function () { var div = get('div'), a = get('div', '<div>Actual:</div>'), b = get('div', '<div>Expected:</div>'), c = get('div', '<div>Diff:</div>'), diff = imagediff.diff(this.actual, expected), canvas = getCanvas(), context; canvas.height = diff.height; canvas.width = diff.width; div.style.overflow = 'hidden'; a.style.float = 'left'; b.style.float = 'left'; c.style.float = 'left'; context = canvas.getContext('2d'); context.putImageData(diff, 0, 0); a.appendChild(toCanvas(this.actual)); b.appendChild(toCanvas(expected)); c.appendChild(canvas); div.appendChild(a); div.appendChild(b); div.appendChild(c); return [ div, "Expected not to be equal." ]; }; } return imagediff.equal(this.actual, expected, tolerance); } }; // Image Output function imageDataToPNG (imageData, outputFile, callback) { var canvas = toCanvas(imageData), base64Data, decodedImage; callback = callback || Function; base64Data = canvas.toDataURL().replace(/^data:image\/\w+;base64,/,""); decodedImage = new Buffer(base64Data, 'base64'); require('fs').writeFile(outputFile, decodedImage, callback); } // Definition imagediff = { createCanvas : getCanvas, createImageData : getImageData, isImage : isImage, isCanvas : isCanvas, isContext : isContext, isImageData : isImageData, isImageType : isImageType, toImageData : function (object) { checkType(object); if (isImageData(object)) { return copyImageData(object); } return toImageData(object); }, equal : function (a, b, tolerance) { checkType(a, b); a = toImageData(a); b = toImageData(b); return equal(a, b, tolerance); }, diff : function (a, b, options) { checkType(a, b); a = toImageData(a); b = toImageData(b); return diff(a, b, options); }, jasmine : jasmine, // Compatibility noConflict : function () { root[name] = previous; return imagediff; } }; if (typeof module !== 'undefined') { imagediff.imageDataToPNG = imageDataToPNG; } return imagediff; });