821 lines
28 KiB
JavaScript
821 lines
28 KiB
JavaScript
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
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/* Copyright 2012 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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/* globals ColorSpace, PDFFunction, Util, error, warn, info, isArray, isStream,
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assert, isPDFFunction, UnsupportedManager, UNSUPPORTED_FEATURES */
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'use strict';
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var PatternType = {
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FUNCTION_BASED: 1,
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AXIAL: 2,
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RADIAL: 3,
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FREE_FORM_MESH: 4,
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LATTICE_FORM_MESH: 5,
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COONS_PATCH_MESH: 6,
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TENSOR_PATCH_MESH: 7
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};
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var Pattern = (function PatternClosure() {
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// Constructor should define this.getPattern
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function Pattern() {
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error('should not call Pattern constructor');
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}
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Pattern.prototype = {
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// Input: current Canvas context
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// Output: the appropriate fillStyle or strokeStyle
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getPattern: function Pattern_getPattern(ctx) {
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error('Should not call Pattern.getStyle: ' + ctx);
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}
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};
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Pattern.parseShading = function Pattern_parseShading(shading, matrix, xref,
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res) {
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var dict = isStream(shading) ? shading.dict : shading;
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var type = dict.get('ShadingType');
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switch (type) {
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case PatternType.AXIAL:
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case PatternType.RADIAL:
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// Both radial and axial shadings are handled by RadialAxial shading.
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return new Shadings.RadialAxial(dict, matrix, xref, res);
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case PatternType.FREE_FORM_MESH:
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case PatternType.LATTICE_FORM_MESH:
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case PatternType.COONS_PATCH_MESH:
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case PatternType.TENSOR_PATCH_MESH:
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return new Shadings.Mesh(shading, matrix, xref, res);
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default:
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UnsupportedManager.notify(UNSUPPORTED_FEATURES.shadingPattern);
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return new Shadings.Dummy();
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}
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};
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return Pattern;
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})();
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var Shadings = {};
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// A small number to offset the first/last color stops so we can insert ones to
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// support extend. Number.MIN_VALUE appears to be too small and breaks the
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// extend. 1e-7 works in FF but chrome seems to use an even smaller sized number
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// internally so we have to go bigger.
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Shadings.SMALL_NUMBER = 1e-2;
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// Radial and axial shading have very similar implementations
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// If needed, the implementations can be broken into two classes
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Shadings.RadialAxial = (function RadialAxialClosure() {
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function RadialAxial(dict, matrix, xref, res) {
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this.matrix = matrix;
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this.coordsArr = dict.get('Coords');
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this.shadingType = dict.get('ShadingType');
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this.type = 'Pattern';
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var cs = dict.get('ColorSpace', 'CS');
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cs = ColorSpace.parse(cs, xref, res);
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this.cs = cs;
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var t0 = 0.0, t1 = 1.0;
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if (dict.has('Domain')) {
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var domainArr = dict.get('Domain');
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t0 = domainArr[0];
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t1 = domainArr[1];
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}
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var extendStart = false, extendEnd = false;
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if (dict.has('Extend')) {
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var extendArr = dict.get('Extend');
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extendStart = extendArr[0];
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extendEnd = extendArr[1];
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}
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if (this.shadingType === PatternType.RADIAL &&
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(!extendStart || !extendEnd)) {
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// Radial gradient only currently works if either circle is fully within
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// the other circle.
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var x1 = this.coordsArr[0];
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var y1 = this.coordsArr[1];
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var r1 = this.coordsArr[2];
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var x2 = this.coordsArr[3];
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var y2 = this.coordsArr[4];
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var r2 = this.coordsArr[5];
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var distance = Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
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if (r1 <= r2 + distance &&
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r2 <= r1 + distance) {
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warn('Unsupported radial gradient.');
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}
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}
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this.extendStart = extendStart;
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this.extendEnd = extendEnd;
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var fnObj = dict.get('Function');
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var fn;
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if (isArray(fnObj)) {
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var fnArray = [];
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for (var j = 0, jj = fnObj.length; j < jj; j++) {
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var obj = xref.fetchIfRef(fnObj[j]);
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if (!isPDFFunction(obj)) {
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error('Invalid function');
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}
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fnArray.push(PDFFunction.parse(xref, obj));
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}
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fn = function radialAxialColorFunction(arg) {
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var out = [];
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for (var i = 0, ii = fnArray.length; i < ii; i++) {
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out.push(fnArray[i](arg)[0]);
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}
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return out;
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};
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} else {
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if (!isPDFFunction(fnObj)) {
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error('Invalid function');
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}
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fn = PDFFunction.parse(xref, fnObj);
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}
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// 10 samples seems good enough for now, but probably won't work
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// if there are sharp color changes. Ideally, we would implement
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// the spec faithfully and add lossless optimizations.
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var diff = t1 - t0;
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var step = diff / 10;
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var colorStops = this.colorStops = [];
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// Protect against bad domains so we don't end up in an infinte loop below.
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if (t0 >= t1 || step <= 0) {
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// Acrobat doesn't seem to handle these cases so we'll ignore for
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// now.
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info('Bad shading domain.');
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return;
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}
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for (var i = t0; i <= t1; i += step) {
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var rgbColor = cs.getRgb(fn([i]), 0);
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var cssColor = Util.makeCssRgb(rgbColor);
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colorStops.push([(i - t0) / diff, cssColor]);
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}
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var background = 'transparent';
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if (dict.has('Background')) {
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var rgbColor = cs.getRgb(dict.get('Background'), 0);
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background = Util.makeCssRgb(rgbColor);
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}
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if (!extendStart) {
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// Insert a color stop at the front and offset the first real color stop
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// so it doesn't conflict with the one we insert.
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colorStops.unshift([0, background]);
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colorStops[1][0] += Shadings.SMALL_NUMBER;
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}
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if (!extendEnd) {
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// Same idea as above in extendStart but for the end.
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colorStops[colorStops.length - 1][0] -= Shadings.SMALL_NUMBER;
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colorStops.push([1, background]);
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}
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this.colorStops = colorStops;
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}
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RadialAxial.prototype = {
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getIR: function RadialAxial_getIR() {
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var coordsArr = this.coordsArr;
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var shadingType = this.shadingType;
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var type, p0, p1, r0, r1;
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if (shadingType == PatternType.AXIAL) {
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p0 = [coordsArr[0], coordsArr[1]];
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p1 = [coordsArr[2], coordsArr[3]];
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r0 = null;
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r1 = null;
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type = 'axial';
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} else if (shadingType == PatternType.RADIAL) {
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p0 = [coordsArr[0], coordsArr[1]];
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p1 = [coordsArr[3], coordsArr[4]];
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r0 = coordsArr[2];
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r1 = coordsArr[5];
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type = 'radial';
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} else {
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error('getPattern type unknown: ' + shadingType);
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}
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var matrix = this.matrix;
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if (matrix) {
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p0 = Util.applyTransform(p0, matrix);
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p1 = Util.applyTransform(p1, matrix);
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}
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return ['RadialAxial', type, this.colorStops, p0, p1, r0, r1];
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}
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};
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return RadialAxial;
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})();
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// All mesh shading. For now, they will be presented as set of the triangles
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// to be drawn on the canvas and rgb color for each vertex.
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Shadings.Mesh = (function MeshClosure() {
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function MeshStreamReader(stream, context) {
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this.stream = stream;
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this.context = context;
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this.buffer = 0;
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this.bufferLength = 0;
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}
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MeshStreamReader.prototype = {
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get hasData() {
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if (this.stream.end) {
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return this.stream.pos < this.stream.end;
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}
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if (this.bufferLength > 0) {
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return true;
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}
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var nextByte = this.stream.getByte();
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if (nextByte < 0) {
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return false;
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}
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this.buffer = nextByte;
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this.bufferLength = 8;
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return true;
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},
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readBits: function MeshStreamReader_readBits(n) {
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var buffer = this.buffer;
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var bufferLength = this.bufferLength;
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if (n === 32) {
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if (bufferLength === 0) {
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return ((this.stream.getByte() << 24) |
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(this.stream.getByte() << 16) | (this.stream.getByte() << 8) |
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this.stream.getByte()) >>> 0;
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}
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buffer = (buffer << 24) | (this.stream.getByte() << 16) |
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(this.stream.getByte() << 8) | this.stream.getByte();
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var nextByte = this.stream.getByte();
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this.buffer = nextByte & ((1 << bufferLength) - 1);
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return ((buffer << (8 - bufferLength)) |
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((nextByte & 0xFF) >> bufferLength)) >>> 0;
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}
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if (n === 8 && bufferLength === 0) {
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return this.stream.getByte();
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}
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while (bufferLength < n) {
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buffer = (buffer << 8) | this.stream.getByte();
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bufferLength += 8;
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}
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bufferLength -= n;
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this.bufferLength = bufferLength;
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this.buffer = buffer & ((1 << bufferLength) - 1);
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return buffer >> bufferLength;
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},
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align: function MeshStreamReader_align() {
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this.buffer = 0;
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this.bufferLength = 0;
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},
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readFlag: function MeshStreamReader_readFlag() {
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return this.readBits(this.context.bitsPerFlag);
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},
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readCoordinate: function MeshStreamReader_readCoordinate() {
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var bitsPerCoordinate = this.context.bitsPerCoordinate;
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var xi = this.readBits(bitsPerCoordinate);
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var yi = this.readBits(bitsPerCoordinate);
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var decode = this.context.decode;
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var scale = bitsPerCoordinate < 32 ? 1 / ((1 << bitsPerCoordinate) - 1) :
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2.3283064365386963e-10; // 2 ^ -32
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return [
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xi * scale * (decode[1] - decode[0]) + decode[0],
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yi * scale * (decode[3] - decode[2]) + decode[2]
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];
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},
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readComponents: function MeshStreamReader_readComponents() {
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var numComps = this.context.numComps;
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var bitsPerComponent = this.context.bitsPerComponent;
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var scale = bitsPerComponent < 32 ? 1 / ((1 << bitsPerComponent) - 1) :
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2.3283064365386963e-10; // 2 ^ -32
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var decode = this.context.decode;
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var components = [];
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for (var i = 0, j = 4; i < numComps; i++, j += 2) {
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var ci = this.readBits(bitsPerComponent);
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components.push(ci * scale * (decode[j + 1] - decode[j]) + decode[j]);
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}
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if (this.context.colorFn) {
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components = this.context.colorFn(components);
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}
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return this.context.colorSpace.getRgb(components, 0);
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}
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};
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function decodeType4Shading(mesh, reader) {
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var coords = mesh.coords;
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var colors = mesh.colors;
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var operators = [];
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var ps = []; // not maintaining cs since that will match ps
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var verticesLeft = 0; // assuming we have all data to start a new triangle
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while (reader.hasData) {
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var f = reader.readFlag();
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var coord = reader.readCoordinate();
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var color = reader.readComponents();
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if (verticesLeft === 0) { // ignoring flags if we started a triangle
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assert(0 <= f && f <= 2, 'Unknown type4 flag');
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switch (f) {
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case 0:
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verticesLeft = 3;
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break;
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case 1:
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ps.push(ps[ps.length - 2], ps[ps.length - 1]);
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verticesLeft = 1;
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break;
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case 2:
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ps.push(ps[ps.length - 3], ps[ps.length - 1]);
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verticesLeft = 1;
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break;
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}
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operators.push(f);
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}
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ps.push(coords.length);
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coords.push(coord);
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colors.push(color);
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verticesLeft--;
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reader.align();
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}
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var psPacked = new Int32Array(ps);
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mesh.figures.push({
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type: 'triangles',
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coords: psPacked,
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colors: psPacked
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});
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}
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function decodeType5Shading(mesh, reader, verticesPerRow) {
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var coords = mesh.coords;
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var colors = mesh.colors;
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var operators = [];
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var ps = []; // not maintaining cs since that will match ps
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while (reader.hasData) {
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var coord = reader.readCoordinate();
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var color = reader.readComponents();
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ps.push(coords.length);
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coords.push(coord);
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colors.push(color);
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}
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var psPacked = new Int32Array(ps);
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mesh.figures.push({
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type: 'lattice',
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coords: psPacked,
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colors: psPacked,
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verticesPerRow: verticesPerRow
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});
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}
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var MIN_SPLIT_PATCH_CHUNKS_AMOUNT = 3;
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var MAX_SPLIT_PATCH_CHUNKS_AMOUNT = 20;
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var TRIANGLE_DENSITY = 20; // count of triangles per entire mesh bounds
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var getB = (function getBClosure() {
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function buildB(count) {
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var lut = [];
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for (var i = 0; i <= count; i++) {
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var t = i / count, t_ = 1 - t;
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lut.push(new Float32Array([t_ * t_ * t_, 3 * t * t_ * t_,
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3 * t * t * t_, t * t * t]));
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}
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return lut;
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}
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var cache = [];
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return function getB(count) {
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if (!cache[count]) {
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cache[count] = buildB(count);
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}
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return cache[count];
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};
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})();
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function buildFigureFromPatch(mesh, index) {
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var figure = mesh.figures[index];
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assert(figure.type === 'patch', 'Unexpected patch mesh figure');
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var coords = mesh.coords, colors = mesh.colors;
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var pi = figure.coords;
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var ci = figure.colors;
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var figureMinX = Math.min(coords[pi[0]][0], coords[pi[3]][0],
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coords[pi[12]][0], coords[pi[15]][0]);
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var figureMinY = Math.min(coords[pi[0]][1], coords[pi[3]][1],
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coords[pi[12]][1], coords[pi[15]][1]);
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var figureMaxX = Math.max(coords[pi[0]][0], coords[pi[3]][0],
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coords[pi[12]][0], coords[pi[15]][0]);
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var figureMaxY = Math.max(coords[pi[0]][1], coords[pi[3]][1],
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coords[pi[12]][1], coords[pi[15]][1]);
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var splitXBy = Math.ceil((figureMaxX - figureMinX) * TRIANGLE_DENSITY /
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(mesh.bounds[2] - mesh.bounds[0]));
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splitXBy = Math.max(MIN_SPLIT_PATCH_CHUNKS_AMOUNT,
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Math.min(MAX_SPLIT_PATCH_CHUNKS_AMOUNT, splitXBy));
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var splitYBy = Math.ceil((figureMaxY - figureMinY) * TRIANGLE_DENSITY /
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(mesh.bounds[3] - mesh.bounds[1]));
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splitYBy = Math.max(MIN_SPLIT_PATCH_CHUNKS_AMOUNT,
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Math.min(MAX_SPLIT_PATCH_CHUNKS_AMOUNT, splitYBy));
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var verticesPerRow = splitXBy + 1;
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var figureCoords = new Int32Array((splitYBy + 1) * verticesPerRow);
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var figureColors = new Int32Array((splitYBy + 1) * verticesPerRow);
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var k = 0;
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var cl = new Uint8Array(3), cr = new Uint8Array(3);
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var c0 = colors[ci[0]], c1 = colors[ci[1]],
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c2 = colors[ci[2]], c3 = colors[ci[3]];
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var bRow = getB(splitYBy), bCol = getB(splitXBy);
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for (var row = 0; row <= splitYBy; row++) {
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cl[0] = ((c0[0] * (splitYBy - row) + c2[0] * row) / splitYBy) | 0;
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cl[1] = ((c0[1] * (splitYBy - row) + c2[1] * row) / splitYBy) | 0;
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cl[2] = ((c0[2] * (splitYBy - row) + c2[2] * row) / splitYBy) | 0;
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cr[0] = ((c1[0] * (splitYBy - row) + c3[0] * row) / splitYBy) | 0;
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cr[1] = ((c1[1] * (splitYBy - row) + c3[1] * row) / splitYBy) | 0;
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cr[2] = ((c1[2] * (splitYBy - row) + c3[2] * row) / splitYBy) | 0;
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for (var col = 0; col <= splitXBy; col++, k++) {
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if ((row === 0 || row === splitYBy) &&
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(col === 0 || col === splitXBy)) {
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continue;
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}
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var x = 0, y = 0;
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var q = 0;
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for (var i = 0; i <= 3; i++) {
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for (var j = 0; j <= 3; j++, q++) {
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var m = bRow[row][i] * bCol[col][j];
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x += coords[pi[q]][0] * m;
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y += coords[pi[q]][1] * m;
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}
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}
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figureCoords[k] = coords.length;
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coords.push([x, y]);
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figureColors[k] = colors.length;
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var newColor = new Uint8Array(3);
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newColor[0] = ((cl[0] * (splitXBy - col) + cr[0] * col) / splitXBy) | 0;
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newColor[1] = ((cl[1] * (splitXBy - col) + cr[1] * col) / splitXBy) | 0;
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newColor[2] = ((cl[2] * (splitXBy - col) + cr[2] * col) / splitXBy) | 0;
|
|
colors.push(newColor);
|
|
}
|
|
}
|
|
figureCoords[0] = pi[0];
|
|
figureColors[0] = ci[0];
|
|
figureCoords[splitXBy] = pi[3];
|
|
figureColors[splitXBy] = ci[1];
|
|
figureCoords[verticesPerRow * splitYBy] = pi[12];
|
|
figureColors[verticesPerRow * splitYBy] = ci[2];
|
|
figureCoords[verticesPerRow * splitYBy + splitXBy] = pi[15];
|
|
figureColors[verticesPerRow * splitYBy + splitXBy] = ci[3];
|
|
|
|
mesh.figures[index] = {
|
|
type: 'lattice',
|
|
coords: figureCoords,
|
|
colors: figureColors,
|
|
verticesPerRow: verticesPerRow
|
|
};
|
|
}
|
|
|
|
function decodeType6Shading(mesh, reader) {
|
|
// A special case of Type 7. The p11, p12, p21, p22 automatically filled
|
|
var coords = mesh.coords;
|
|
var colors = mesh.colors;
|
|
var ps = new Int32Array(16); // p00, p10, ..., p30, p01, ..., p33
|
|
var cs = new Int32Array(4); // c00, c30, c03, c33
|
|
while (reader.hasData) {
|
|
var f = reader.readFlag();
|
|
assert(0 <= f && f <= 3, 'Unknown type6 flag');
|
|
var i, ii;
|
|
var pi = coords.length;
|
|
for (i = 0, ii = (f !== 0 ? 8 : 12); i < ii; i++) {
|
|
coords.push(reader.readCoordinate());
|
|
}
|
|
var ci = colors.length;
|
|
for (i = 0, ii = (f !== 0 ? 2 : 4); i < ii; i++) {
|
|
colors.push(reader.readComponents());
|
|
}
|
|
var tmp1, tmp2, tmp3, tmp4;
|
|
switch (f) {
|
|
case 0:
|
|
ps[12] = pi + 3; ps[13] = pi + 4; ps[14] = pi + 5; ps[15] = pi + 6;
|
|
ps[ 8] = pi + 2; /* values for 5, 6, 9, 10 are */ ps[11] = pi + 7;
|
|
ps[ 4] = pi + 1; /* calculated below */ ps[ 7] = pi + 8;
|
|
ps[ 0] = pi; ps[ 1] = pi + 11; ps[ 2] = pi + 10; ps[ 3] = pi + 9;
|
|
cs[2] = ci + 1; cs[3] = ci + 2;
|
|
cs[0] = ci; cs[1] = ci + 3;
|
|
break;
|
|
case 1:
|
|
tmp1 = ps[12]; tmp2 = ps[13]; tmp3 = ps[14]; tmp4 = ps[15];
|
|
ps[12] = pi + 5; ps[13] = pi + 4; ps[14] = pi + 3; ps[15] = pi + 2;
|
|
ps[ 8] = pi + 6; /* values for 5, 6, 9, 10 are */ ps[11] = pi + 1;
|
|
ps[ 4] = pi + 7; /* calculated below */ ps[ 7] = pi;
|
|
ps[ 0] = tmp1; ps[ 1] = tmp2; ps[ 2] = tmp3; ps[ 3] = tmp4;
|
|
tmp1 = cs[2]; tmp2 = cs[3];
|
|
cs[2] = ci + 1; cs[3] = ci;
|
|
cs[0] = tmp1; cs[1] = tmp2;
|
|
break;
|
|
case 2:
|
|
ps[12] = ps[15]; ps[13] = pi + 7; ps[14] = pi + 6; ps[15] = pi + 5;
|
|
ps[ 8] = ps[11]; /* values for 5, 6, 9, 10 are */ ps[11] = pi + 4;
|
|
ps[ 4] = ps[7]; /* calculated below */ ps[ 7] = pi + 3;
|
|
ps[ 0] = ps[3]; ps[ 1] = pi; ps[ 2] = pi + 1; ps[ 3] = pi + 2;
|
|
cs[2] = cs[3]; cs[3] = ci + 1;
|
|
cs[0] = cs[1]; cs[1] = ci;
|
|
break;
|
|
case 3:
|
|
ps[12] = ps[0]; ps[13] = ps[1]; ps[14] = ps[2]; ps[15] = ps[3];
|
|
ps[ 8] = pi; /* values for 5, 6, 9, 10 are */ ps[11] = pi + 7;
|
|
ps[ 4] = pi + 1; /* calculated below */ ps[ 7] = pi + 6;
|
|
ps[ 0] = pi + 2; ps[ 1] = pi + 3; ps[ 2] = pi + 4; ps[ 3] = pi + 5;
|
|
cs[2] = cs[0]; cs[3] = cs[1];
|
|
cs[0] = ci; cs[1] = ci + 1;
|
|
break;
|
|
}
|
|
// set p11, p12, p21, p22
|
|
ps[5] = coords.length;
|
|
coords.push([
|
|
(-4 * coords[ps[0]][0] - coords[ps[15]][0] +
|
|
6 * (coords[ps[4]][0] + coords[ps[1]][0]) -
|
|
2 * (coords[ps[12]][0] + coords[ps[3]][0]) +
|
|
3 * (coords[ps[13]][0] + coords[ps[7]][0])) / 9,
|
|
(-4 * coords[ps[0]][1] - coords[ps[15]][1] +
|
|
6 * (coords[ps[4]][1] + coords[ps[1]][1]) -
|
|
2 * (coords[ps[12]][1] + coords[ps[3]][1]) +
|
|
3 * (coords[ps[13]][1] + coords[ps[7]][1])) / 9
|
|
]);
|
|
ps[6] = coords.length;
|
|
coords.push([
|
|
(-4 * coords[ps[3]][0] - coords[ps[12]][0] +
|
|
6 * (coords[ps[2]][0] + coords[ps[7]][0]) -
|
|
2 * (coords[ps[0]][0] + coords[ps[15]][0]) +
|
|
3 * (coords[ps[4]][0] + coords[ps[14]][0])) / 9,
|
|
(-4 * coords[ps[3]][1] - coords[ps[12]][1] +
|
|
6 * (coords[ps[2]][1] + coords[ps[7]][1]) -
|
|
2 * (coords[ps[0]][1] + coords[ps[15]][1]) +
|
|
3 * (coords[ps[4]][1] + coords[ps[14]][1])) / 9
|
|
]);
|
|
ps[9] = coords.length;
|
|
coords.push([
|
|
(-4 * coords[ps[12]][0] - coords[ps[3]][0] +
|
|
6 * (coords[ps[8]][0] + coords[ps[13]][0]) -
|
|
2 * (coords[ps[0]][0] + coords[ps[15]][0]) +
|
|
3 * (coords[ps[11]][0] + coords[ps[1]][0])) / 9,
|
|
(-4 * coords[ps[12]][1] - coords[ps[3]][1] +
|
|
6 * (coords[ps[8]][1] + coords[ps[13]][1]) -
|
|
2 * (coords[ps[0]][1] + coords[ps[15]][1]) +
|
|
3 * (coords[ps[11]][1] + coords[ps[1]][1])) / 9
|
|
]);
|
|
ps[10] = coords.length;
|
|
coords.push([
|
|
(-4 * coords[ps[15]][0] - coords[ps[0]][0] +
|
|
6 * (coords[ps[11]][0] + coords[ps[14]][0]) -
|
|
2 * (coords[ps[12]][0] + coords[ps[3]][0]) +
|
|
3 * (coords[ps[2]][0] + coords[ps[8]][0])) / 9,
|
|
(-4 * coords[ps[15]][1] - coords[ps[0]][1] +
|
|
6 * (coords[ps[11]][1] + coords[ps[14]][1]) -
|
|
2 * (coords[ps[12]][1] + coords[ps[3]][1]) +
|
|
3 * (coords[ps[2]][1] + coords[ps[8]][1])) / 9
|
|
]);
|
|
mesh.figures.push({
|
|
type: 'patch',
|
|
coords: new Int32Array(ps), // making copies of ps and cs
|
|
colors: new Int32Array(cs)
|
|
});
|
|
}
|
|
}
|
|
|
|
function decodeType7Shading(mesh, reader) {
|
|
var coords = mesh.coords;
|
|
var colors = mesh.colors;
|
|
var ps = new Int32Array(16); // p00, p10, ..., p30, p01, ..., p33
|
|
var cs = new Int32Array(4); // c00, c30, c03, c33
|
|
while (reader.hasData) {
|
|
var f = reader.readFlag();
|
|
assert(0 <= f && f <= 3, 'Unknown type7 flag');
|
|
var i, ii;
|
|
var pi = coords.length;
|
|
for (i = 0, ii = (f !== 0 ? 12 : 16); i < ii; i++) {
|
|
coords.push(reader.readCoordinate());
|
|
}
|
|
var ci = colors.length;
|
|
for (i = 0, ii = (f !== 0 ? 2 : 4); i < ii; i++) {
|
|
colors.push(reader.readComponents());
|
|
}
|
|
var tmp1, tmp2, tmp3, tmp4;
|
|
switch (f) {
|
|
case 0:
|
|
ps[12] = pi + 3; ps[13] = pi + 4; ps[14] = pi + 5; ps[15] = pi + 6;
|
|
ps[ 8] = pi + 2; ps[ 9] = pi + 13; ps[10] = pi + 14; ps[11] = pi + 7;
|
|
ps[ 4] = pi + 1; ps[ 5] = pi + 12; ps[ 6] = pi + 15; ps[ 7] = pi + 8;
|
|
ps[ 0] = pi; ps[ 1] = pi + 11; ps[ 2] = pi + 10; ps[ 3] = pi + 9;
|
|
cs[2] = ci + 1; cs[3] = ci + 2;
|
|
cs[0] = ci; cs[1] = ci + 3;
|
|
break;
|
|
case 1:
|
|
tmp1 = ps[12]; tmp2 = ps[13]; tmp3 = ps[14]; tmp4 = ps[15];
|
|
ps[12] = pi + 5; ps[13] = pi + 4; ps[14] = pi + 3; ps[15] = pi + 2;
|
|
ps[ 8] = pi + 6; ps[ 9] = pi + 11; ps[10] = pi + 10; ps[11] = pi + 1;
|
|
ps[ 4] = pi + 7; ps[ 5] = pi + 8; ps[ 6] = pi + 9; ps[ 7] = pi;
|
|
ps[ 0] = tmp1; ps[ 1] = tmp2; ps[ 2] = tmp3; ps[ 3] = tmp4;
|
|
tmp1 = cs[2]; tmp2 = cs[3];
|
|
cs[2] = ci + 1; cs[3] = ci;
|
|
cs[0] = tmp1; cs[1] = tmp2;
|
|
break;
|
|
case 2:
|
|
ps[12] = ps[15]; ps[13] = pi + 7; ps[14] = pi + 6; ps[15] = pi + 5;
|
|
ps[ 8] = ps[11]; ps[ 9] = pi + 8; ps[10] = pi + 11; ps[11] = pi + 4;
|
|
ps[ 4] = ps[7]; ps[ 5] = pi + 9; ps[ 6] = pi + 10; ps[ 7] = pi + 3;
|
|
ps[ 0] = ps[3]; ps[ 1] = pi; ps[ 2] = pi + 1; ps[ 3] = pi + 2;
|
|
cs[2] = cs[3]; cs[3] = ci + 1;
|
|
cs[0] = cs[1]; cs[1] = ci;
|
|
break;
|
|
case 3:
|
|
ps[12] = ps[0]; ps[13] = ps[1]; ps[14] = ps[2]; ps[15] = ps[3];
|
|
ps[ 8] = pi; ps[ 9] = pi + 9; ps[10] = pi + 8; ps[11] = pi + 7;
|
|
ps[ 4] = pi + 1; ps[ 5] = pi + 10; ps[ 6] = pi + 11; ps[ 7] = pi + 6;
|
|
ps[ 0] = pi + 2; ps[ 1] = pi + 3; ps[ 2] = pi + 4; ps[ 3] = pi + 5;
|
|
cs[2] = cs[0]; cs[3] = cs[1];
|
|
cs[0] = ci; cs[1] = ci + 1;
|
|
break;
|
|
}
|
|
mesh.figures.push({
|
|
type: 'patch',
|
|
coords: new Int32Array(ps), // making copies of ps and cs
|
|
colors: new Int32Array(cs)
|
|
});
|
|
}
|
|
}
|
|
|
|
function updateBounds(mesh) {
|
|
var minX = mesh.coords[0][0], minY = mesh.coords[0][1],
|
|
maxX = minX, maxY = minY;
|
|
for (var i = 1, ii = mesh.coords.length; i < ii; i++) {
|
|
var x = mesh.coords[i][0], y = mesh.coords[i][1];
|
|
minX = minX > x ? x : minX;
|
|
minY = minY > y ? y : minY;
|
|
maxX = maxX < x ? x : maxX;
|
|
maxY = maxY < y ? y : maxY;
|
|
}
|
|
mesh.bounds = [minX, minY, maxX, maxY];
|
|
}
|
|
|
|
function Mesh(stream, matrix, xref, res) {
|
|
assert(isStream(stream), 'Mesh data is not a stream');
|
|
var dict = stream.dict;
|
|
this.matrix = matrix;
|
|
this.shadingType = dict.get('ShadingType');
|
|
this.type = 'Pattern';
|
|
this.bbox = dict.get('BBox');
|
|
var cs = dict.get('ColorSpace', 'CS');
|
|
cs = ColorSpace.parse(cs, xref, res);
|
|
this.cs = cs;
|
|
this.background = dict.has('Background') ?
|
|
cs.getRgb(dict.get('Background'), 0) : null;
|
|
|
|
var fnObj = dict.get('Function');
|
|
var fn;
|
|
if (!fnObj) {
|
|
fn = null;
|
|
} else if (isArray(fnObj)) {
|
|
var fnArray = [];
|
|
for (var j = 0, jj = fnObj.length; j < jj; j++) {
|
|
var obj = xref.fetchIfRef(fnObj[j]);
|
|
if (!isPDFFunction(obj)) {
|
|
error('Invalid function');
|
|
}
|
|
fnArray.push(PDFFunction.parse(xref, obj));
|
|
}
|
|
fn = function radialAxialColorFunction(arg) {
|
|
var out = [];
|
|
for (var i = 0, ii = fnArray.length; i < ii; i++) {
|
|
out.push(fnArray[i](arg)[0]);
|
|
}
|
|
return out;
|
|
};
|
|
} else {
|
|
if (!isPDFFunction(fnObj)) {
|
|
error('Invalid function');
|
|
}
|
|
fn = PDFFunction.parse(xref, fnObj);
|
|
}
|
|
|
|
this.coords = [];
|
|
this.colors = [];
|
|
this.figures = [];
|
|
|
|
var decodeContext = {
|
|
bitsPerCoordinate: dict.get('BitsPerCoordinate'),
|
|
bitsPerComponent: dict.get('BitsPerComponent'),
|
|
bitsPerFlag: dict.get('BitsPerFlag'),
|
|
decode: dict.get('Decode'),
|
|
colorFn: fn,
|
|
colorSpace: cs,
|
|
numComps: fn ? 1 : cs.numComps
|
|
};
|
|
var reader = new MeshStreamReader(stream, decodeContext);
|
|
|
|
var patchMesh = false;
|
|
switch (this.shadingType) {
|
|
case PatternType.FREE_FORM_MESH:
|
|
decodeType4Shading(this, reader);
|
|
break;
|
|
case PatternType.LATTICE_FORM_MESH:
|
|
var verticesPerRow = dict.get('VerticesPerRow') | 0;
|
|
assert(verticesPerRow >= 2, 'Invalid VerticesPerRow');
|
|
decodeType5Shading(this, reader, verticesPerRow);
|
|
break;
|
|
case PatternType.COONS_PATCH_MESH:
|
|
decodeType6Shading(this, reader);
|
|
patchMesh = true;
|
|
break;
|
|
case PatternType.TENSOR_PATCH_MESH:
|
|
decodeType7Shading(this, reader);
|
|
patchMesh = true;
|
|
break;
|
|
default:
|
|
error('Unsupported mesh type.');
|
|
break;
|
|
}
|
|
|
|
if (patchMesh) {
|
|
// dirty bounds calculation for determining, how dense shall be triangles
|
|
updateBounds(this);
|
|
for (var i = 0, ii = this.figures.length; i < ii; i++) {
|
|
buildFigureFromPatch(this, i);
|
|
}
|
|
}
|
|
// calculate bounds
|
|
updateBounds(this);
|
|
}
|
|
|
|
Mesh.prototype = {
|
|
getIR: function Mesh_getIR() {
|
|
var type = this.shadingType;
|
|
var i, ii, j;
|
|
var coords = this.coords;
|
|
var coordsPacked = new Float32Array(coords.length * 2);
|
|
for (i = 0, j = 0, ii = coords.length; i < ii; i++) {
|
|
var xy = coords[i];
|
|
coordsPacked[j++] = xy[0];
|
|
coordsPacked[j++] = xy[1];
|
|
}
|
|
var colors = this.colors;
|
|
var colorsPacked = new Uint8Array(colors.length * 3);
|
|
for (i = 0, j = 0, ii = colors.length; i < ii; i++) {
|
|
var c = colors[i];
|
|
colorsPacked[j++] = c[0];
|
|
colorsPacked[j++] = c[1];
|
|
colorsPacked[j++] = c[2];
|
|
}
|
|
var figures = this.figures;
|
|
var bbox = this.bbox;
|
|
var bounds = this.bounds;
|
|
var matrix = this.matrix;
|
|
var background = this.background;
|
|
|
|
return ['Mesh', type, coordsPacked, colorsPacked, figures, bounds,
|
|
matrix, bbox, background];
|
|
}
|
|
};
|
|
|
|
return Mesh;
|
|
})();
|
|
|
|
Shadings.Dummy = (function DummyClosure() {
|
|
function Dummy() {
|
|
this.type = 'Pattern';
|
|
}
|
|
|
|
Dummy.prototype = {
|
|
getIR: function Dummy_getIR() {
|
|
return ['Dummy'];
|
|
}
|
|
};
|
|
return Dummy;
|
|
})();
|
|
|
|
function getTilingPatternIR(operatorList, dict, args) {
|
|
var matrix = dict.get('Matrix');
|
|
var bbox = dict.get('BBox');
|
|
var xstep = dict.get('XStep');
|
|
var ystep = dict.get('YStep');
|
|
var paintType = dict.get('PaintType');
|
|
var tilingType = dict.get('TilingType');
|
|
|
|
return [
|
|
'TilingPattern', args, operatorList, matrix, bbox, xstep, ystep,
|
|
paintType, tilingType
|
|
];
|
|
}
|