@abasb75/dicom-pixel-decoder
Version:
a powerfull javascript dicom pixel data decoder
152 lines (151 loc) • 8.13 kB
JavaScript
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g = Object.create((typeof Iterator === "function" ? Iterator : Object).prototype);
return g.next = verb(0), g["throw"] = verb(1), g["return"] = verb(2), typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (g && (g = 0, op[0] && (_ = 0)), _) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
import { decode } from "@abasb75/turbojpeg-decoder";
import JpegImage from '@abasb75/jpegjs';
var JPEGBaselineLossyProcess1_8bit = /** @class */ (function () {
function JPEGBaselineLossyProcess1_8bit() {
}
Object.defineProperty(JPEGBaselineLossyProcess1_8bit, "decode", {
enumerable: false,
configurable: true,
writable: true,
value: function (pixelData, options) {
return __awaiter(this, void 0, void 0, function () {
var _a, data;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
_b.trys.push([0, 1, , 3]);
if (options.bitsAllocated === 8 &&
[3, 4].includes(options.samplesPerPixel)) {
return [2 /*return*/, JPEGBaselineLossyProcess1_8bit.browser(pixelData)];
}
else {
return [2 /*return*/, JPEGBaselineLossyProcess1_8bit.jpegJS(pixelData, options)];
}
return [3 /*break*/, 3];
case 1:
_a = _b.sent();
return [4 /*yield*/, JPEGBaselineLossyProcess1_8bit.turboJpeg(pixelData)];
case 2:
data = _b.sent();
return [2 /*return*/, data];
case 3: return [2 /*return*/];
}
});
});
}
});
Object.defineProperty(JPEGBaselineLossyProcess1_8bit, "jpegJS", {
enumerable: false,
configurable: true,
writable: true,
value: function (pixelData, options) {
return __awaiter(this, void 0, void 0, function () {
var jpeg;
return __generator(this, function (_a) {
jpeg = new JpegImage();
jpeg.parse(new Uint8Array(pixelData.buffer));
if (options.bitsAllocated > 8) {
return [2 /*return*/, jpeg.getData16(options.columns, options.rows)];
}
return [2 /*return*/, jpeg.getData(options.columns, options.rows)];
});
});
}
});
Object.defineProperty(JPEGBaselineLossyProcess1_8bit, "browser", {
enumerable: false,
configurable: true,
writable: true,
value: function (pixelData) {
return __awaiter(this, void 0, void 0, function () {
var createImage, arrayBufferView, blob, urlCreator, imageUrl, img, canvas, context, imageData;
var _a;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
createImage = function (imageData) { return new Promise(function (resolve, reject) {
var img = document.createElement('img');
img.src = imageData;
img.onload = function () {
resolve(img);
};
img.onerror = function () {
reject();
};
}); };
arrayBufferView = new Uint8Array(pixelData.buffer);
blob = new Blob([arrayBufferView], { type: "image/jpeg" });
urlCreator = window.URL || window.webkitURL;
imageUrl = urlCreator.createObjectURL(blob);
return [4 /*yield*/, createImage(imageUrl)];
case 1:
img = _b.sent();
canvas = document.createElement('canvas');
canvas.height = img.height;
canvas.width = img.width;
context = canvas.getContext('2d');
context === null || context === void 0 ? void 0 : context.drawImage(img, 0, 0);
imageData = context === null || context === void 0 ? void 0 : context.getImageData(0, 0, img.width, img.height);
return [2 /*return*/, new Uint8Array((_a = imageData === null || imageData === void 0 ? void 0 : imageData.data) === null || _a === void 0 ? void 0 : _a.buffer)];
}
});
});
}
});
Object.defineProperty(JPEGBaselineLossyProcess1_8bit, "turboJpeg", {
enumerable: false,
configurable: true,
writable: true,
value: function (pixelData) {
return __awaiter(this, void 0, void 0, function () {
var decoded;
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, decode(pixelData.buffer)];
case 1:
decoded = _a.sent();
return [2 /*return*/, decoded === null || decoded === void 0 ? void 0 : decoded.decodedBuffer];
}
});
});
}
});
return JPEGBaselineLossyProcess1_8bit;
}());
export default JPEGBaselineLossyProcess1_8bit;