795 lines
22 KiB
JavaScript
795 lines
22 KiB
JavaScript
/* Copyright 2015 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import {
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BaseException,
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FeatureTest,
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shadow,
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Util,
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warn,
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} from "../shared/util.js";
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const SVG_NS = "http://www.w3.org/2000/svg";
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class PixelsPerInch {
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static CSS = 96.0;
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static PDF = 72.0;
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static PDF_TO_CSS_UNITS = this.CSS / this.PDF;
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}
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async function fetchData(url, type = "text") {
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if (
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(typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) ||
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isValidFetchUrl(url, document.baseURI)
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) {
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const response = await fetch(url);
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if (!response.ok) {
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throw new Error(response.statusText);
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}
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switch (type) {
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case "arraybuffer":
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return response.arrayBuffer();
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case "blob":
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return response.blob();
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case "json":
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return response.json();
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}
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return response.text();
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}
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// The Fetch API is not supported.
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return new Promise((resolve, reject) => {
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const request = new XMLHttpRequest();
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request.open("GET", url, /* async = */ true);
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request.responseType = type;
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request.onreadystatechange = () => {
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if (request.readyState !== XMLHttpRequest.DONE) {
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return;
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}
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if (request.status === 200 || request.status === 0) {
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switch (type) {
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case "arraybuffer":
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case "blob":
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case "json":
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resolve(request.response);
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return;
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}
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resolve(request.responseText);
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return;
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}
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reject(new Error(request.statusText));
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};
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request.send(null);
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});
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}
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/**
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* @typedef {Object} PageViewportParameters
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* @property {Array<number>} viewBox - The xMin, yMin, xMax and
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* yMax coordinates.
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* @property {number} userUnit - The size of units.
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* @property {number} scale - The scale of the viewport.
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* @property {number} rotation - The rotation, in degrees, of the viewport.
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* @property {number} [offsetX] - The horizontal, i.e. x-axis, offset. The
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* default value is `0`.
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* @property {number} [offsetY] - The vertical, i.e. y-axis, offset. The
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* default value is `0`.
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* @property {boolean} [dontFlip] - If true, the y-axis will not be flipped.
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* The default value is `false`.
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*/
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/**
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* @typedef {Object} PageViewportCloneParameters
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* @property {number} [scale] - The scale, overriding the one in the cloned
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* viewport. The default value is `this.scale`.
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* @property {number} [rotation] - The rotation, in degrees, overriding the one
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* in the cloned viewport. The default value is `this.rotation`.
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* @property {number} [offsetX] - The horizontal, i.e. x-axis, offset.
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* The default value is `this.offsetX`.
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* @property {number} [offsetY] - The vertical, i.e. y-axis, offset.
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* The default value is `this.offsetY`.
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* @property {boolean} [dontFlip] - If true, the x-axis will not be flipped.
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* The default value is `false`.
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*/
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/**
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* PDF page viewport created based on scale, rotation and offset.
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*/
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class PageViewport {
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/**
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* @param {PageViewportParameters}
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*/
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constructor({
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viewBox,
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userUnit,
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scale,
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rotation,
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offsetX = 0,
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offsetY = 0,
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dontFlip = false,
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}) {
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this.viewBox = viewBox;
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this.userUnit = userUnit;
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this.scale = scale;
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this.rotation = rotation;
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this.offsetX = offsetX;
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this.offsetY = offsetY;
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scale *= userUnit; // Take the userUnit into account.
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// creating transform to convert pdf coordinate system to the normal
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// canvas like coordinates taking in account scale and rotation
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const centerX = (viewBox[2] + viewBox[0]) / 2;
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const centerY = (viewBox[3] + viewBox[1]) / 2;
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let rotateA, rotateB, rotateC, rotateD;
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// Normalize the rotation, by clamping it to the [0, 360) range.
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rotation %= 360;
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if (rotation < 0) {
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rotation += 360;
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}
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switch (rotation) {
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case 180:
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rotateA = -1;
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rotateB = 0;
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rotateC = 0;
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rotateD = 1;
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break;
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case 90:
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rotateA = 0;
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rotateB = 1;
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rotateC = 1;
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rotateD = 0;
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break;
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case 270:
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rotateA = 0;
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rotateB = -1;
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rotateC = -1;
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rotateD = 0;
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break;
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case 0:
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rotateA = 1;
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rotateB = 0;
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rotateC = 0;
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rotateD = -1;
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break;
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default:
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throw new Error(
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"PageViewport: Invalid rotation, must be a multiple of 90 degrees."
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);
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}
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if (dontFlip) {
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rotateC = -rotateC;
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rotateD = -rotateD;
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}
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let offsetCanvasX, offsetCanvasY;
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let width, height;
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if (rotateA === 0) {
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offsetCanvasX = Math.abs(centerY - viewBox[1]) * scale + offsetX;
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offsetCanvasY = Math.abs(centerX - viewBox[0]) * scale + offsetY;
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width = (viewBox[3] - viewBox[1]) * scale;
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height = (viewBox[2] - viewBox[0]) * scale;
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} else {
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offsetCanvasX = Math.abs(centerX - viewBox[0]) * scale + offsetX;
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offsetCanvasY = Math.abs(centerY - viewBox[1]) * scale + offsetY;
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width = (viewBox[2] - viewBox[0]) * scale;
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height = (viewBox[3] - viewBox[1]) * scale;
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}
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// creating transform for the following operations:
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// translate(-centerX, -centerY), rotate and flip vertically,
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// scale, and translate(offsetCanvasX, offsetCanvasY)
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this.transform = [
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rotateA * scale,
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rotateB * scale,
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rotateC * scale,
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rotateD * scale,
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offsetCanvasX - rotateA * scale * centerX - rotateC * scale * centerY,
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offsetCanvasY - rotateB * scale * centerX - rotateD * scale * centerY,
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];
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this.width = width;
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this.height = height;
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}
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/**
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* The original, un-scaled, viewport dimensions.
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* @type {Object}
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*/
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get rawDims() {
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const dims = this.viewBox;
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return shadow(this, "rawDims", {
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pageWidth: dims[2] - dims[0],
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pageHeight: dims[3] - dims[1],
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pageX: dims[0],
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pageY: dims[1],
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});
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}
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/**
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* Clones viewport, with optional additional properties.
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* @param {PageViewportCloneParameters} [params]
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* @returns {PageViewport} Cloned viewport.
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*/
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clone({
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scale = this.scale,
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rotation = this.rotation,
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offsetX = this.offsetX,
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offsetY = this.offsetY,
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dontFlip = false,
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} = {}) {
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return new PageViewport({
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viewBox: this.viewBox.slice(),
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userUnit: this.userUnit,
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scale,
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rotation,
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offsetX,
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offsetY,
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dontFlip,
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});
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}
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/**
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* Converts PDF point to the viewport coordinates. For examples, useful for
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* converting PDF location into canvas pixel coordinates.
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* @param {number} x - The x-coordinate.
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* @param {number} y - The y-coordinate.
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* @returns {Array} Array containing `x`- and `y`-coordinates of the
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* point in the viewport coordinate space.
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* @see {@link convertToPdfPoint}
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* @see {@link convertToViewportRectangle}
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*/
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convertToViewportPoint(x, y) {
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const p = [x, y];
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Util.applyTransform(p, this.transform);
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return p;
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}
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/**
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* Converts PDF rectangle to the viewport coordinates.
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* @param {Array} rect - The xMin, yMin, xMax and yMax coordinates.
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* @returns {Array} Array containing corresponding coordinates of the
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* rectangle in the viewport coordinate space.
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* @see {@link convertToViewportPoint}
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*/
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convertToViewportRectangle(rect) {
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const topLeft = [rect[0], rect[1]];
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Util.applyTransform(topLeft, this.transform);
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const bottomRight = [rect[2], rect[3]];
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Util.applyTransform(bottomRight, this.transform);
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return [topLeft[0], topLeft[1], bottomRight[0], bottomRight[1]];
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}
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/**
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* Converts viewport coordinates to the PDF location. For examples, useful
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* for converting canvas pixel location into PDF one.
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* @param {number} x - The x-coordinate.
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* @param {number} y - The y-coordinate.
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* @returns {Array} Array containing `x`- and `y`-coordinates of the
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* point in the PDF coordinate space.
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* @see {@link convertToViewportPoint}
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*/
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convertToPdfPoint(x, y) {
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const p = [x, y];
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Util.applyInverseTransform(p, this.transform);
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return p;
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}
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}
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class RenderingCancelledException extends BaseException {
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constructor(msg, extraDelay = 0) {
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super(msg, "RenderingCancelledException");
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this.extraDelay = extraDelay;
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}
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}
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function isDataScheme(url) {
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const ii = url.length;
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let i = 0;
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while (i < ii && url[i].trim() === "") {
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i++;
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}
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return url.substring(i, i + 5).toLowerCase() === "data:";
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}
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function isPdfFile(filename) {
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return typeof filename === "string" && /\.pdf$/i.test(filename);
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}
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/**
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* Gets the filename from a given URL.
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* @param {string} url
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* @returns {string}
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*/
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function getFilenameFromUrl(url) {
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[url] = url.split(/[#?]/, 1);
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return url.substring(url.lastIndexOf("/") + 1);
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}
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/**
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* Returns the filename or guessed filename from the url (see issue 3455).
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* @param {string} url - The original PDF location.
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* @param {string} defaultFilename - The value returned if the filename is
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* unknown, or the protocol is unsupported.
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* @returns {string} Guessed PDF filename.
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*/
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function getPdfFilenameFromUrl(url, defaultFilename = "document.pdf") {
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if (typeof url !== "string") {
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return defaultFilename;
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}
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if (isDataScheme(url)) {
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warn('getPdfFilenameFromUrl: ignore "data:"-URL for performance reasons.');
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return defaultFilename;
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}
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const getURL = urlString => {
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try {
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return new URL(urlString);
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} catch {
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try {
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return new URL(decodeURIComponent(urlString));
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} catch {
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try {
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// Attempt to parse the URL using the document's base URI.
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return new URL(urlString, "https://foo.bar");
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} catch {
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try {
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return new URL(decodeURIComponent(urlString), "https://foo.bar");
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} catch {
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return null;
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}
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}
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}
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}
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};
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const newURL = getURL(url);
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if (!newURL) {
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// If the URL is invalid, return the default filename.
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return defaultFilename;
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}
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const decode = name => {
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try {
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let decoded = decodeURIComponent(name);
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if (decoded.includes("/")) {
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decoded = decoded.split("/").at(-1);
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if (decoded.test(/^\.pdf$/i)) {
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return decoded;
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}
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return name;
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}
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return decoded;
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} catch {
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return name;
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}
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};
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const pdfRegex = /\.pdf$/i;
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const filename = newURL.pathname.split("/").at(-1);
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if (pdfRegex.test(filename)) {
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return decode(filename);
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}
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if (newURL.searchParams.size > 0) {
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const values = Array.from(newURL.searchParams.values()).reverse();
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for (const value of values) {
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if (pdfRegex.test(value)) {
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// If any of the search parameters ends with ".pdf", return it.
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return decode(value);
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}
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}
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const keys = Array.from(newURL.searchParams.keys()).reverse();
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for (const key of keys) {
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if (pdfRegex.test(key)) {
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// If any of the search parameter keys ends with ".pdf", return it.
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return decode(key);
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}
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}
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}
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if (newURL.hash) {
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const reFilename = /[^/?#=]+\.pdf\b(?!.*\.pdf\b)/i;
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const hashFilename = reFilename.exec(newURL.hash);
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if (hashFilename) {
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return decode(hashFilename[0]);
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}
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}
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return defaultFilename;
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}
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class StatTimer {
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started = Object.create(null);
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times = [];
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time(name) {
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if (name in this.started) {
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warn(`Timer is already running for ${name}`);
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}
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this.started[name] = Date.now();
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}
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timeEnd(name) {
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if (!(name in this.started)) {
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warn(`Timer has not been started for ${name}`);
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}
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this.times.push({
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name,
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start: this.started[name],
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end: Date.now(),
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});
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// Remove timer from started so it can be called again.
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delete this.started[name];
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}
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toString() {
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// Find the longest name for padding purposes.
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const outBuf = [];
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let longest = 0;
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for (const { name } of this.times) {
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longest = Math.max(name.length, longest);
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}
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for (const { name, start, end } of this.times) {
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outBuf.push(`${name.padEnd(longest)} ${end - start}ms\n`);
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}
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return outBuf.join("");
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}
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}
|
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|
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function isValidFetchUrl(url, baseUrl) {
|
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if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
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throw new Error("Not implemented: isValidFetchUrl");
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}
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const res = baseUrl ? URL.parse(url, baseUrl) : URL.parse(url);
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// The Fetch API only supports the http/https protocols, and not file/ftp.
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return res?.protocol === "http:" || res?.protocol === "https:";
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}
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/**
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* Event handler to suppress context menu.
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*/
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function noContextMenu(e) {
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e.preventDefault();
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}
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function stopEvent(e) {
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e.preventDefault();
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e.stopPropagation();
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}
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|
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// Deprecated API function -- display regardless of the `verbosity` setting.
|
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function deprecated(details) {
|
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// eslint-disable-next-line no-console
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console.log("Deprecated API usage: " + details);
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}
|
|
|
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class PDFDateString {
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static #regex;
|
|
|
|
/**
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* Convert a PDF date string to a JavaScript `Date` object.
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*
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* The PDF date string format is described in section 7.9.4 of the official
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* PDF 32000-1:2008 specification. However, in the PDF 1.7 reference (sixth
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* edition) Adobe describes the same format including a trailing apostrophe.
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* This syntax in incorrect, but Adobe Acrobat creates PDF files that contain
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* them. We ignore all apostrophes as they are not necessary for date parsing.
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*
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* Moreover, Adobe Acrobat doesn't handle changing the date to universal time
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* and doesn't use the user's time zone (effectively ignoring the HH' and mm'
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* parts of the date string).
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*
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* @param {string} input
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* @returns {Date|null}
|
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*/
|
|
static toDateObject(input) {
|
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if (!input || typeof input !== "string") {
|
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return null;
|
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}
|
|
|
|
// Lazily initialize the regular expression.
|
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this.#regex ||= new RegExp(
|
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"^D:" + // Prefix (required)
|
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"(\\d{4})" + // Year (required)
|
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"(\\d{2})?" + // Month (optional)
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"(\\d{2})?" + // Day (optional)
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"(\\d{2})?" + // Hour (optional)
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"(\\d{2})?" + // Minute (optional)
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"(\\d{2})?" + // Second (optional)
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"([Z|+|-])?" + // Universal time relation (optional)
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"(\\d{2})?" + // Offset hour (optional)
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"'?" + // Splitting apostrophe (optional)
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"(\\d{2})?" + // Offset minute (optional)
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"'?" // Trailing apostrophe (optional)
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);
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|
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// Optional fields that don't satisfy the requirements from the regular
|
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// expression (such as incorrect digit counts or numbers that are out of
|
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// range) will fall back the defaults from the specification.
|
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const matches = this.#regex.exec(input);
|
|
if (!matches) {
|
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return null;
|
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}
|
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|
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// JavaScript's `Date` object expects the month to be between 0 and 11
|
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// instead of 1 and 12, so we have to correct for that.
|
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const year = parseInt(matches[1], 10);
|
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let month = parseInt(matches[2], 10);
|
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month = month >= 1 && month <= 12 ? month - 1 : 0;
|
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let day = parseInt(matches[3], 10);
|
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day = day >= 1 && day <= 31 ? day : 1;
|
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let hour = parseInt(matches[4], 10);
|
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hour = hour >= 0 && hour <= 23 ? hour : 0;
|
|
let minute = parseInt(matches[5], 10);
|
|
minute = minute >= 0 && minute <= 59 ? minute : 0;
|
|
let second = parseInt(matches[6], 10);
|
|
second = second >= 0 && second <= 59 ? second : 0;
|
|
const universalTimeRelation = matches[7] || "Z";
|
|
let offsetHour = parseInt(matches[8], 10);
|
|
offsetHour = offsetHour >= 0 && offsetHour <= 23 ? offsetHour : 0;
|
|
let offsetMinute = parseInt(matches[9], 10) || 0;
|
|
offsetMinute = offsetMinute >= 0 && offsetMinute <= 59 ? offsetMinute : 0;
|
|
|
|
// Universal time relation 'Z' means that the local time is equal to the
|
|
// universal time, whereas the relations '+'/'-' indicate that the local
|
|
// time is later respectively earlier than the universal time. Every date
|
|
// is normalized to universal time.
|
|
if (universalTimeRelation === "-") {
|
|
hour += offsetHour;
|
|
minute += offsetMinute;
|
|
} else if (universalTimeRelation === "+") {
|
|
hour -= offsetHour;
|
|
minute -= offsetMinute;
|
|
}
|
|
|
|
return new Date(Date.UTC(year, month, day, hour, minute, second));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* NOTE: This is (mostly) intended to support printing of XFA forms.
|
|
*/
|
|
function getXfaPageViewport(xfaPage, { scale = 1, rotation = 0 }) {
|
|
const { width, height } = xfaPage.attributes.style;
|
|
const viewBox = [0, 0, parseInt(width), parseInt(height)];
|
|
|
|
return new PageViewport({
|
|
viewBox,
|
|
userUnit: 1,
|
|
scale,
|
|
rotation,
|
|
});
|
|
}
|
|
|
|
function getRGB(color) {
|
|
if (color.startsWith("#")) {
|
|
const colorRGB = parseInt(color.slice(1), 16);
|
|
return [
|
|
(colorRGB & 0xff0000) >> 16,
|
|
(colorRGB & 0x00ff00) >> 8,
|
|
colorRGB & 0x0000ff,
|
|
];
|
|
}
|
|
|
|
if (color.startsWith("rgb(")) {
|
|
// getComputedStyle(...).color returns a `rgb(R, G, B)` color.
|
|
return color
|
|
.slice(/* "rgb(".length */ 4, -1) // Strip out "rgb(" and ")".
|
|
.split(",")
|
|
.map(x => parseInt(x));
|
|
}
|
|
|
|
if (color.startsWith("rgba(")) {
|
|
return color
|
|
.slice(/* "rgba(".length */ 5, -1) // Strip out "rgba(" and ")".
|
|
.split(",")
|
|
.map(x => parseInt(x))
|
|
.slice(0, 3);
|
|
}
|
|
|
|
warn(`Not a valid color format: "${color}"`);
|
|
return [0, 0, 0];
|
|
}
|
|
|
|
function getColorValues(colors) {
|
|
const span = document.createElement("span");
|
|
span.style.visibility = "hidden";
|
|
// NOTE: The following does *not* affect `forced-colors: active` mode.
|
|
span.style.colorScheme = "only light";
|
|
document.body.append(span);
|
|
for (const name of colors.keys()) {
|
|
span.style.color = name;
|
|
const computedColor = window.getComputedStyle(span).color;
|
|
colors.set(name, getRGB(computedColor));
|
|
}
|
|
span.remove();
|
|
}
|
|
|
|
function getCurrentTransform(ctx) {
|
|
const { a, b, c, d, e, f } = ctx.getTransform();
|
|
return [a, b, c, d, e, f];
|
|
}
|
|
|
|
function getCurrentTransformInverse(ctx) {
|
|
const { a, b, c, d, e, f } = ctx.getTransform().invertSelf();
|
|
return [a, b, c, d, e, f];
|
|
}
|
|
|
|
/**
|
|
* @param {HTMLDivElement} div
|
|
* @param {PageViewport} viewport
|
|
* @param {boolean} mustFlip
|
|
* @param {boolean} mustRotate
|
|
*/
|
|
function setLayerDimensions(
|
|
div,
|
|
viewport,
|
|
mustFlip = false,
|
|
mustRotate = true
|
|
) {
|
|
if (viewport instanceof PageViewport) {
|
|
const { pageWidth, pageHeight } = viewport.rawDims;
|
|
const { style } = div;
|
|
const useRound = FeatureTest.isCSSRoundSupported;
|
|
|
|
const w = `var(--total-scale-factor) * ${pageWidth}px`,
|
|
h = `var(--total-scale-factor) * ${pageHeight}px`;
|
|
const widthStr = useRound
|
|
? `round(down, ${w}, var(--scale-round-x))`
|
|
: `calc(${w})`,
|
|
heightStr = useRound
|
|
? `round(down, ${h}, var(--scale-round-y))`
|
|
: `calc(${h})`;
|
|
|
|
if (!mustFlip || viewport.rotation % 180 === 0) {
|
|
style.width = widthStr;
|
|
style.height = heightStr;
|
|
} else {
|
|
style.width = heightStr;
|
|
style.height = widthStr;
|
|
}
|
|
}
|
|
|
|
if (mustRotate) {
|
|
div.setAttribute("data-main-rotation", viewport.rotation);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Scale factors for the canvas, necessary with HiDPI displays.
|
|
*/
|
|
class OutputScale {
|
|
constructor() {
|
|
const { pixelRatio } = OutputScale;
|
|
|
|
/**
|
|
* @type {number} Horizontal scale.
|
|
*/
|
|
this.sx = pixelRatio;
|
|
|
|
/**
|
|
* @type {number} Vertical scale.
|
|
*/
|
|
this.sy = pixelRatio;
|
|
}
|
|
|
|
/**
|
|
* @type {boolean} Returns `true` when scaling is required, `false` otherwise.
|
|
*/
|
|
get scaled() {
|
|
return this.sx !== 1 || this.sy !== 1;
|
|
}
|
|
|
|
/**
|
|
* @type {boolean} Returns `true` when scaling is symmetric,
|
|
* `false` otherwise.
|
|
*/
|
|
get symmetric() {
|
|
return this.sx === this.sy;
|
|
}
|
|
|
|
/**
|
|
* @returns {boolean} Returns `true` if scaling was limited,
|
|
* `false` otherwise.
|
|
*/
|
|
limitCanvas(width, height, maxPixels, maxDim, capAreaFactor = -1) {
|
|
let maxAreaScale = Infinity,
|
|
maxWidthScale = Infinity,
|
|
maxHeightScale = Infinity;
|
|
|
|
maxPixels = OutputScale.capPixels(maxPixels, capAreaFactor);
|
|
if (maxPixels > 0) {
|
|
maxAreaScale = Math.sqrt(maxPixels / (width * height));
|
|
}
|
|
if (maxDim !== -1) {
|
|
maxWidthScale = maxDim / width;
|
|
maxHeightScale = maxDim / height;
|
|
}
|
|
const maxScale = Math.min(maxAreaScale, maxWidthScale, maxHeightScale);
|
|
|
|
if (this.sx > maxScale || this.sy > maxScale) {
|
|
this.sx = maxScale;
|
|
this.sy = maxScale;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static get pixelRatio() {
|
|
return globalThis.devicePixelRatio || 1;
|
|
}
|
|
|
|
static capPixels(maxPixels, capAreaFactor) {
|
|
if (capAreaFactor >= 0) {
|
|
const winPixels = Math.ceil(
|
|
(typeof PDFJSDev !== "undefined" && PDFJSDev.test("TESTING")
|
|
? window.innerWidth * window.innerHeight
|
|
: window.screen.availWidth * window.screen.availHeight) *
|
|
this.pixelRatio ** 2 *
|
|
(1 + capAreaFactor / 100)
|
|
);
|
|
return maxPixels > 0 ? Math.min(maxPixels, winPixels) : winPixels;
|
|
}
|
|
return maxPixels;
|
|
}
|
|
}
|
|
|
|
// See https://developer.mozilla.org/en-US/docs/Web/Media/Formats/Image_types
|
|
// to know which types are supported by the browser.
|
|
const SupportedImageMimeTypes = [
|
|
"image/apng",
|
|
"image/avif",
|
|
"image/bmp",
|
|
"image/gif",
|
|
"image/jpeg",
|
|
"image/png",
|
|
"image/svg+xml",
|
|
"image/webp",
|
|
"image/x-icon",
|
|
];
|
|
|
|
export {
|
|
deprecated,
|
|
fetchData,
|
|
getColorValues,
|
|
getCurrentTransform,
|
|
getCurrentTransformInverse,
|
|
getFilenameFromUrl,
|
|
getPdfFilenameFromUrl,
|
|
getRGB,
|
|
getXfaPageViewport,
|
|
isDataScheme,
|
|
isPdfFile,
|
|
isValidFetchUrl,
|
|
noContextMenu,
|
|
OutputScale,
|
|
PageViewport,
|
|
PDFDateString,
|
|
PixelsPerInch,
|
|
RenderingCancelledException,
|
|
setLayerDimensions,
|
|
StatTimer,
|
|
stopEvent,
|
|
SupportedImageMimeTypes,
|
|
SVG_NS,
|
|
};
|