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Split files into worker and main thread pieces.
This commit is contained in:
Brendan Dahl
parent
e5cd027dce
commit
5ecce4996b
41 changed files with 817 additions and 786 deletions
426
src/shared/pattern.js
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426
src/shared/pattern.js
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/* -*- 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 CanvasGraphics, ColorSpace, DeviceRgbCS, error,
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info, isArray, isPDFFunction, isStream, PDFFunction, TODO, Util,
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warn, CachedCanvases */
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'use strict';
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var PatternType = {
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AXIAL: 2,
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RADIAL: 3
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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.shadingFromIR = function Pattern_shadingFromIR(raw) {
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return Shadings[raw[0]].fromIR(raw);
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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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default:
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TODO('Unsupported shading type: ' + type);
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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, ctx) {
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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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this.ctx = ctx;
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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.fromIR = function RadialAxial_fromIR(raw) {
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var type = raw[1];
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var colorStops = raw[2];
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var p0 = raw[3];
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var p1 = raw[4];
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var r0 = raw[5];
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var r1 = raw[6];
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return {
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type: 'Pattern',
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getPattern: function RadialAxial_getPattern(ctx) {
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var grad;
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if (type == PatternType.AXIAL)
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grad = ctx.createLinearGradient(p0[0], p0[1], p1[0], p1[1]);
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else if (type == PatternType.RADIAL)
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grad = ctx.createRadialGradient(p0[0], p0[1], r0, p1[0], p1[1], r1);
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for (var i = 0, ii = colorStops.length; i < ii; ++i) {
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var c = colorStops[i];
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grad.addColorStop(c[0], c[1]);
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}
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return grad;
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}
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};
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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 type = this.shadingType;
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if (type == PatternType.AXIAL) {
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var p0 = [coordsArr[0], coordsArr[1]];
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var p1 = [coordsArr[2], coordsArr[3]];
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var r0 = null;
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var r1 = null;
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} else if (type == PatternType.RADIAL) {
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var p0 = [coordsArr[0], coordsArr[1]];
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var p1 = [coordsArr[3], coordsArr[4]];
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var r0 = coordsArr[2];
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var r1 = coordsArr[5];
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} else {
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error('getPattern type unknown: ' + type);
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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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Shadings.Dummy = (function DummyClosure() {
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function Dummy() {
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this.type = 'Pattern';
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}
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Dummy.fromIR = function Dummy_fromIR() {
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return {
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type: 'Pattern',
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getPattern: function Dummy_fromIR_getPattern() {
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return 'hotpink';
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}
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};
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};
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Dummy.prototype = {
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getIR: function Dummy_getIR() {
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return ['Dummy'];
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}
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};
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return Dummy;
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})();
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var TilingPattern = (function TilingPatternClosure() {
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var PaintType = {
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COLORED: 1,
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UNCOLORED: 2
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};
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var MAX_PATTERN_SIZE = 8192;
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function TilingPattern(IR, color, ctx, objs, commonObjs, baseTransform) {
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this.name = IR[1][0].name;
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this.operatorList = IR[2];
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this.matrix = IR[3] || [1, 0, 0, 1, 0, 0];
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this.bbox = IR[4];
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this.xstep = IR[5];
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this.ystep = IR[6];
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this.paintType = IR[7];
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this.tilingType = IR[8];
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this.color = color;
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this.objs = objs;
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this.commonObjs = commonObjs;
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this.baseTransform = baseTransform;
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this.type = 'Pattern';
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this.ctx = ctx;
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}
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TilingPattern.getIR = function TilingPattern_getIR(operatorList, dict, args) {
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var matrix = dict.get('Matrix');
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var bbox = dict.get('BBox');
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var xstep = dict.get('XStep');
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var ystep = dict.get('YStep');
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var paintType = dict.get('PaintType');
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var tilingType = dict.get('TilingType');
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return [
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'TilingPattern', args, operatorList, matrix, bbox, xstep, ystep,
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paintType, tilingType
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];
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};
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TilingPattern.prototype = {
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createPatternCanvas: function TilinPattern_createPatternCanvas(tmpCanvas) {
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var operatorList = this.operatorList;
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var bbox = this.bbox;
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var xstep = this.xstep;
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var ystep = this.ystep;
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var paintType = this.paintType;
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var tilingType = this.tilingType;
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var color = this.color;
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var objs = this.objs;
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var commonObjs = this.commonObjs;
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var ctx = this.ctx;
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TODO('TilingType: ' + tilingType);
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var x0 = bbox[0], y0 = bbox[1], x1 = bbox[2], y1 = bbox[3];
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var topLeft = [x0, y0];
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// we want the canvas to be as large as the step size
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var botRight = [x0 + xstep, y0 + ystep];
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var width = botRight[0] - topLeft[0];
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var height = botRight[1] - topLeft[1];
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// Obtain scale from matrix and current transformation matrix.
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var matrixScale = Util.singularValueDecompose2dScale(this.matrix);
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var curMatrixScale = Util.singularValueDecompose2dScale(
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this.baseTransform);
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var combinedScale = [matrixScale[0] * curMatrixScale[0],
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matrixScale[1] * curMatrixScale[1]];
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// MAX_PATTERN_SIZE is used to avoid OOM situation.
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// Use width and height values that are as close as possible to the end
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// result when the pattern is used. Too low value makes the pattern look
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// blurry. Too large value makes it look too crispy.
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width = Math.min(Math.ceil(Math.abs(width * combinedScale[0])),
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MAX_PATTERN_SIZE);
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height = Math.min(Math.ceil(Math.abs(height * combinedScale[1])),
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MAX_PATTERN_SIZE);
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tmpCanvas.width = width;
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tmpCanvas.height = height;
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// set the new canvas element context as the graphics context
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var tmpCtx = tmpCanvas.getContext('2d');
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var graphics = new CanvasGraphics(tmpCtx, commonObjs, objs);
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this.setFillAndStrokeStyleToContext(tmpCtx, paintType, color);
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this.setScale(width, height, xstep, ystep);
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this.transformToScale(graphics);
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// transform coordinates to pattern space
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var tmpTranslate = [1, 0, 0, 1, -topLeft[0], -topLeft[1]];
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graphics.transform.apply(graphics, tmpTranslate);
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this.clipBbox(graphics, bbox, x0, y0, x1, y1);
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graphics.executeOperatorList(operatorList);
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},
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setScale: function TilingPattern_setScale(width, height, xstep, ystep) {
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this.scale = [width / xstep, height / ystep];
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},
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transformToScale: function TilingPattern_transformToScale(graphics) {
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var scale = this.scale;
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var tmpScale = [scale[0], 0, 0, scale[1], 0, 0];
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graphics.transform.apply(graphics, tmpScale);
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},
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scaleToContext: function TilingPattern_scaleToContext() {
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var scale = this.scale;
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this.ctx.scale(1 / scale[0], 1 / scale[1]);
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},
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clipBbox: function clipBbox(graphics, bbox, x0, y0, x1, y1) {
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if (bbox && isArray(bbox) && 4 == bbox.length) {
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var bboxWidth = x1 - x0;
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var bboxHeight = y1 - y0;
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graphics.rectangle(x0, y0, bboxWidth, bboxHeight);
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graphics.clip();
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graphics.endPath();
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}
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},
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setFillAndStrokeStyleToContext:
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function setFillAndStrokeStyleToContext(context, paintType, color) {
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switch (paintType) {
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case PaintType.COLORED:
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var ctx = this.ctx;
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context.fillStyle = ctx.fillStyle;
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context.strokeStyle = ctx.strokeStyle;
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break;
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case PaintType.UNCOLORED:
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var rgbColor = ColorSpace.singletons.rgb.getRgb(color, 0);
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var cssColor = Util.makeCssRgb(rgbColor);
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context.fillStyle = cssColor;
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context.strokeStyle = cssColor;
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break;
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default:
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error('Unsupported paint type: ' + paintType);
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}
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},
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getPattern: function TilingPattern_getPattern() {
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var temporaryPatternCanvas = CachedCanvases.getCanvas('pattern');
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this.createPatternCanvas(temporaryPatternCanvas);
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var ctx = this.ctx;
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ctx.setTransform.apply(ctx, this.baseTransform);
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ctx.transform.apply(ctx, this.matrix);
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this.scaleToContext();
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return ctx.createPattern(temporaryPatternCanvas, 'repeat');
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}
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};
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return TilingPattern;
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})();
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