mirror of
https://github.com/mozilla/pdf.js.git
synced 2026-02-08 00:21:11 +01:00
355efc46d2
This change will discard trailing space adjustments in TJ/showSpacedText() for the purposes of calculating the text width for text selection. In pathological cases, a PDF may write one character and then move the text matrix back to the beginning of the character within one TJ invocation. This would add up to a canvasWidth of 0, so the text selection <div> would be scaled to zero pixels wide, even though the character was drawn normally. With this change, canvasWidth will not include any adjustments made after the last character was written. Normal use of TJ will result in the same text selection behavior, whereas pathological use of TJ will result in the text selection layer matching the actual width of the characters displayed. For an example of such pathological behavior, see http://www.tycovalves-usa.com/ld/CROMC-0297-US.pdf#page=48
1556 lines
52 KiB
JavaScript
1556 lines
52 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, DeviceCmykCS, DeviceGrayCS, DeviceRgbCS, error,
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FONT_IDENTITY_MATRIX, IDENTITY_MATRIX, ImageData, isArray, isNum,
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isString, Pattern, TilingPattern, TODO, Util, warn */
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'use strict';
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// <canvas> contexts store most of the state we need natively.
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// However, PDF needs a bit more state, which we store here.
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var TextRenderingMode = {
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FILL: 0,
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STROKE: 1,
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FILL_STROKE: 2,
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INVISIBLE: 3,
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FILL_ADD_TO_PATH: 4,
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STROKE_ADD_TO_PATH: 5,
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FILL_STROKE_ADD_TO_PATH: 6,
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ADD_TO_PATH: 7,
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ADD_TO_PATH_FLAG: 4
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};
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// Minimal font size that would be used during canvas fillText operations.
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var MIN_FONT_SIZE = 1;
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function createScratchCanvas(width, height) {
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var canvas = document.createElement('canvas');
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canvas.width = width;
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canvas.height = height;
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return canvas;
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}
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function addContextCurrentTransform(ctx) {
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// If the context doesn't expose a `mozCurrentTransform`, add a JS based on.
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if (!ctx.mozCurrentTransform) {
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// Store the original context
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ctx._scaleX = ctx._scaleX || 1.0;
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ctx._scaleY = ctx._scaleY || 1.0;
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ctx._originalSave = ctx.save;
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ctx._originalRestore = ctx.restore;
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ctx._originalRotate = ctx.rotate;
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ctx._originalScale = ctx.scale;
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ctx._originalTranslate = ctx.translate;
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ctx._originalTransform = ctx.transform;
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ctx._transformMatrix = [ctx._scaleX, 0, 0, ctx._scaleY, 0, 0];
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ctx._transformStack = [];
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Object.defineProperty(ctx, 'mozCurrentTransform', {
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get: function getCurrentTransform() {
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return this._transformMatrix;
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}
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});
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Object.defineProperty(ctx, 'mozCurrentTransformInverse', {
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get: function getCurrentTransformInverse() {
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// Calculation done using WolframAlpha:
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// http://www.wolframalpha.com/input/?
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// i=Inverse+{{a%2C+c%2C+e}%2C+{b%2C+d%2C+f}%2C+{0%2C+0%2C+1}}
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var m = this._transformMatrix;
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var a = m[0], b = m[1], c = m[2], d = m[3], e = m[4], f = m[5];
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var ad_bc = a * d - b * c;
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var bc_ad = b * c - a * d;
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return [
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d / ad_bc,
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b / bc_ad,
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c / bc_ad,
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a / ad_bc,
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(d * e - c * f) / bc_ad,
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(b * e - a * f) / ad_bc
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];
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}
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});
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ctx.save = function ctxSave() {
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var old = this._transformMatrix;
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this._transformStack.push(old);
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this._transformMatrix = old.slice(0, 6);
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this._originalSave();
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};
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ctx.restore = function ctxRestore() {
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var prev = this._transformStack.pop();
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if (prev) {
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this._transformMatrix = prev;
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this._originalRestore();
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}
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};
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ctx.translate = function ctxTranslate(x, y) {
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var m = this._transformMatrix;
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m[4] = m[0] * x + m[2] * y + m[4];
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m[5] = m[1] * x + m[3] * y + m[5];
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this._originalTranslate(x, y);
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};
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ctx.scale = function ctxScale(x, y) {
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var m = this._transformMatrix;
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m[0] = m[0] * x;
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m[1] = m[1] * x;
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m[2] = m[2] * y;
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m[3] = m[3] * y;
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this._originalScale(x, y);
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};
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ctx.transform = function ctxTransform(a, b, c, d, e, f) {
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var m = this._transformMatrix;
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this._transformMatrix = [
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m[0] * a + m[2] * b,
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m[1] * a + m[3] * b,
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m[0] * c + m[2] * d,
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m[1] * c + m[3] * d,
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m[0] * e + m[2] * f + m[4],
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m[1] * e + m[3] * f + m[5]
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];
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ctx._originalTransform(a, b, c, d, e, f);
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};
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ctx.rotate = function ctxRotate(angle) {
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var cosValue = Math.cos(angle);
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var sinValue = Math.sin(angle);
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var m = this._transformMatrix;
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this._transformMatrix = [
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m[0] * cosValue + m[2] * sinValue,
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m[1] * cosValue + m[3] * sinValue,
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m[0] * (-sinValue) + m[2] * cosValue,
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m[1] * (-sinValue) + m[3] * cosValue,
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m[4],
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m[5]
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];
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this._originalRotate(angle);
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};
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}
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}
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var CanvasExtraState = (function CanvasExtraStateClosure() {
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function CanvasExtraState(old) {
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// Are soft masks and alpha values shapes or opacities?
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this.alphaIsShape = false;
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this.fontSize = 0;
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this.fontSizeScale = 1;
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this.textMatrix = IDENTITY_MATRIX;
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this.fontMatrix = FONT_IDENTITY_MATRIX;
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this.leading = 0;
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// Current point (in user coordinates)
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this.x = 0;
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this.y = 0;
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// Start of text line (in text coordinates)
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this.lineX = 0;
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this.lineY = 0;
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// Character and word spacing
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this.charSpacing = 0;
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this.wordSpacing = 0;
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this.textHScale = 1;
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this.textRenderingMode = TextRenderingMode.FILL;
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this.textRise = 0;
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// Color spaces
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this.fillColorSpace = new DeviceGrayCS();
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this.fillColorSpaceObj = null;
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this.strokeColorSpace = new DeviceGrayCS();
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this.strokeColorSpaceObj = null;
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this.fillColorObj = null;
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this.strokeColorObj = null;
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// Default fore and background colors
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this.fillColor = '#000000';
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this.strokeColor = '#000000';
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// Note: fill alpha applies to all non-stroking operations
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this.fillAlpha = 1;
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this.strokeAlpha = 1;
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this.lineWidth = 1;
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this.paintFormXObjectDepth = 0;
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this.old = old;
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}
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CanvasExtraState.prototype = {
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clone: function CanvasExtraState_clone() {
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return Object.create(this);
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},
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setCurrentPoint: function CanvasExtraState_setCurrentPoint(x, y) {
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this.x = x;
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this.y = y;
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}
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};
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return CanvasExtraState;
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})();
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var CanvasGraphics = (function CanvasGraphicsClosure() {
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// Defines the time the executeOperatorList is going to be executing
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// before it stops and shedules a continue of execution.
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var EXECUTION_TIME = 15;
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function CanvasGraphics(canvasCtx, commonObjs, objs, textLayer, imageLayer) {
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this.ctx = canvasCtx;
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this.current = new CanvasExtraState();
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this.stateStack = [];
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this.pendingClip = null;
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this.res = null;
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this.xobjs = null;
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this.commonObjs = commonObjs;
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this.objs = objs;
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this.textLayer = textLayer;
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this.imageLayer = imageLayer;
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if (canvasCtx) {
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addContextCurrentTransform(canvasCtx);
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}
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}
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function applyStencilMask(imgArray, width, height, inverseDecode, buffer) {
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var imgArrayPos = 0;
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var i, j, mask, buf;
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// removing making non-masked pixels transparent
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var bufferPos = 3; // alpha component offset
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for (i = 0; i < height; i++) {
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mask = 0;
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for (j = 0; j < width; j++) {
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if (!mask) {
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buf = imgArray[imgArrayPos++];
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mask = 128;
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}
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if (!(buf & mask) === inverseDecode) {
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buffer[bufferPos] = 0;
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}
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bufferPos += 4;
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mask >>= 1;
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}
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}
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}
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function putBinaryImageData(ctx, data, w, h) {
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var tmpImgData = 'createImageData' in ctx ? ctx.createImageData(w, h) :
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ctx.getImageData(0, 0, w, h);
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var tmpImgDataPixels = tmpImgData.data;
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if ('set' in tmpImgDataPixels)
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tmpImgDataPixels.set(data);
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else {
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// Copy over the imageData pixel by pixel.
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for (var i = 0, ii = tmpImgDataPixels.length; i < ii; i++)
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tmpImgDataPixels[i] = data[i];
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}
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ctx.putImageData(tmpImgData, 0, 0);
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}
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function prescaleImage(pixels, width, height, widthScale, heightScale) {
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pixels = new Uint8Array(pixels); // creating a copy
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while (widthScale > 2 || heightScale > 2) {
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if (heightScale > 2) {
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// scaling image twice vertically
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var rowSize = width * 4;
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var k = 0, l = 0;
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for (var i = 0; i < height - 1; i += 2) {
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for (var j = 0; j < width; j++) {
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var alpha1 = pixels[k + 3], alpha2 = pixels[k + 3 + rowSize];
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if (alpha1 === alpha2) {
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pixels[l] = (pixels[k] + pixels[k + rowSize]) >> 1;
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pixels[l + 1] = (pixels[k + 1] + pixels[k + 1 + rowSize]) >> 1;
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pixels[l + 2] = (pixels[k + 2] + pixels[k + 2 + rowSize]) >> 1;
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pixels[l + 3] = alpha1;
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} else if (alpha1 < alpha2) {
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var d = 256 - alpha2 + alpha1;
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pixels[l] = (pixels[k] * d + (pixels[k + rowSize] << 8)) >> 9;
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pixels[l + 1] = (pixels[k + 1] * d +
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(pixels[k + 1 + rowSize] << 8)) >> 9;
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pixels[l + 2] = (pixels[k + 2] * d +
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(pixels[k + 2 + rowSize] << 8)) >> 9;
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pixels[l + 3] = alpha2;
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} else {
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var d = 256 - alpha1 + alpha2;
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pixels[l] = ((pixels[k] << 8) + pixels[k + rowSize] * d) >> 9;
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pixels[l + 1] = ((pixels[k + 1] << 8) +
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pixels[k + 1 + rowSize] * d) >> 9;
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pixels[l + 2] = ((pixels[k + 2] << 8) +
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pixels[k + 2 + rowSize] * d) >> 9;
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pixels[l + 3] = alpha1;
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}
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k += 4; l += 4;
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}
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k += rowSize;
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}
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if (height & 1) {
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for (var i = 0; i < rowSize; i++) {
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pixels[l++] = pixels[k++];
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}
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}
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height = (height + 1) >> 1;
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heightScale /= 2;
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}
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if (widthScale > 2) {
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// scaling image twice horizontally
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var k = 0, l = 0;
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for (var i = 0; i < height; i++) {
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for (var j = 0; j < width - 1; j += 2) {
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var alpha1 = pixels[k + 3], alpha2 = pixels[k + 7];
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if (alpha1 === alpha2) {
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pixels[l] = (pixels[k] + pixels[k + 4]) >> 1;
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pixels[l + 1] = (pixels[k + 1] + pixels[k + 5]) >> 1;
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pixels[l + 2] = (pixels[k + 2] + pixels[k + 6]) >> 1;
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pixels[l + 3] = alpha1;
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} else if (alpha1 < alpha2) {
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var d = 256 - alpha2 + alpha1;
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pixels[l] = (pixels[k] * d + (pixels[k + 4] << 8)) >> 9;
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pixels[l + 1] = (pixels[k + 1] * d + (pixels[k + 5] << 8)) >> 9;
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pixels[l + 2] = (pixels[k + 2] * d + (pixels[k + 6] << 8)) >> 9;
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pixels[l + 3] = alpha2;
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} else {
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var d = 256 - alpha1 + alpha2;
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pixels[l] = ((pixels[k] << 8) + pixels[k + 4] * d) >> 9;
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pixels[l + 1] = ((pixels[k + 1] << 8) + pixels[k + 5] * d) >> 9;
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pixels[l + 2] = ((pixels[k + 2] << 8) + pixels[k + 6] * d) >> 9;
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pixels[l + 3] = alpha1;
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}
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k += 8; l += 4;
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}
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if (width & 1) {
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pixels[l++] = pixels[k++];
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pixels[l++] = pixels[k++];
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pixels[l++] = pixels[k++];
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pixels[l++] = pixels[k++];
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}
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}
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width = (width + 1) >> 1;
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widthScale /= 2;
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}
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}
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var tmpCanvas = createScratchCanvas(width, height);
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var tmpCtx = tmpCanvas.getContext('2d');
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putBinaryImageData(tmpCtx, pixels.subarray(0, width * height * 4),
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width, height);
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return tmpCanvas;
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}
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var LINE_CAP_STYLES = ['butt', 'round', 'square'];
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var LINE_JOIN_STYLES = ['miter', 'round', 'bevel'];
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var NORMAL_CLIP = {};
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var EO_CLIP = {};
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CanvasGraphics.prototype = {
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slowCommands: {
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'stroke': true,
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'closeStroke': true,
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'fill': true,
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'eoFill': true,
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'fillStroke': true,
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'eoFillStroke': true,
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'closeFillStroke': true,
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'closeEOFillStroke': true,
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'showText': true,
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'showSpacedText': true,
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'setStrokeColorSpace': true,
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'setFillColorSpace': true,
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'setStrokeColor': true,
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'setStrokeColorN': true,
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'setFillColor': true,
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'setFillColorN': true,
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'setStrokeGray': true,
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'setFillGray': true,
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'setStrokeRGBColor': true,
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'setFillRGBColor': true,
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'setStrokeCMYKColor': true,
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'setFillCMYKColor': true,
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'paintJpegXObject': true,
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'paintImageXObject': true,
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'paintInlineImageXObject': true,
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'paintInlineImageXObjectGroup': true,
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'paintImageMaskXObject': true,
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'paintImageMaskXObjectGroup': true,
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'shadingFill': true
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},
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beginDrawing: function CanvasGraphics_beginDrawing(viewport) {
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var transform = viewport.transform;
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this.ctx.save();
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this.ctx.transform.apply(this.ctx, transform);
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if (this.textLayer) {
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this.textLayer.beginLayout();
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}
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if (this.imageLayer) {
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this.imageLayer.beginLayout();
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}
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},
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executeOperatorList: function CanvasGraphics_executeOperatorList(
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operatorList,
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executionStartIdx, continueCallback,
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stepper) {
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var argsArray = operatorList.argsArray;
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var fnArray = operatorList.fnArray;
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var i = executionStartIdx || 0;
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var argsArrayLen = argsArray.length;
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// Sometimes the OperatorList to execute is empty.
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if (argsArrayLen == i) {
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return i;
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}
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var executionEndIdx;
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var endTime = Date.now() + EXECUTION_TIME;
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var commonObjs = this.commonObjs;
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var objs = this.objs;
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var fnName;
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var slowCommands = this.slowCommands;
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while (true) {
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if (stepper && i === stepper.nextBreakPoint) {
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stepper.breakIt(i, continueCallback);
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return i;
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}
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fnName = fnArray[i];
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if (fnName !== 'dependency') {
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this[fnName].apply(this, argsArray[i]);
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} else {
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var deps = argsArray[i];
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for (var n = 0, nn = deps.length; n < nn; n++) {
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var depObjId = deps[n];
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var common = depObjId.substring(0, 2) == 'g_';
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|
|
// If the promise isn't resolved yet, add the continueCallback
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|
// to the promise and bail out.
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|
if (!common && !objs.isResolved(depObjId)) {
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objs.get(depObjId, continueCallback);
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return i;
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}
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if (common && !commonObjs.isResolved(depObjId)) {
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commonObjs.get(depObjId, continueCallback);
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return i;
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}
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}
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}
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i++;
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// If the entire operatorList was executed, stop as were done.
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|
if (i == argsArrayLen) {
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return i;
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}
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|
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// If the execution took longer then a certain amount of time, shedule
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|
// to continue exeution after a short delay.
|
|
// However, this is only possible if a 'continueCallback' is passed in.
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|
if (continueCallback && slowCommands[fnName] && Date.now() > endTime) {
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setTimeout(continueCallback, 0);
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return i;
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}
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|
|
// If the operatorList isn't executed completely yet OR the execution
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// time was short enough, do another execution round.
|
|
}
|
|
},
|
|
|
|
endDrawing: function CanvasGraphics_endDrawing() {
|
|
this.ctx.restore();
|
|
|
|
if (this.textLayer) {
|
|
this.textLayer.endLayout();
|
|
}
|
|
if (this.imageLayer) {
|
|
this.imageLayer.endLayout();
|
|
}
|
|
},
|
|
|
|
// Graphics state
|
|
setLineWidth: function CanvasGraphics_setLineWidth(width) {
|
|
this.current.lineWidth = width;
|
|
this.ctx.lineWidth = width;
|
|
},
|
|
setLineCap: function CanvasGraphics_setLineCap(style) {
|
|
this.ctx.lineCap = LINE_CAP_STYLES[style];
|
|
},
|
|
setLineJoin: function CanvasGraphics_setLineJoin(style) {
|
|
this.ctx.lineJoin = LINE_JOIN_STYLES[style];
|
|
},
|
|
setMiterLimit: function CanvasGraphics_setMiterLimit(limit) {
|
|
this.ctx.miterLimit = limit;
|
|
},
|
|
setDash: function CanvasGraphics_setDash(dashArray, dashPhase) {
|
|
var ctx = this.ctx;
|
|
if ('setLineDash' in ctx) {
|
|
ctx.setLineDash(dashArray);
|
|
ctx.lineDashOffset = dashPhase;
|
|
} else {
|
|
ctx.mozDash = dashArray;
|
|
ctx.mozDashOffset = dashPhase;
|
|
}
|
|
},
|
|
setRenderingIntent: function CanvasGraphics_setRenderingIntent(intent) {
|
|
// Maybe if we one day fully support color spaces this will be important
|
|
// for now we can ignore.
|
|
// TODO set rendering intent?
|
|
},
|
|
setFlatness: function CanvasGraphics_setFlatness(flatness) {
|
|
// There's no way to control this with canvas, but we can safely ignore.
|
|
// TODO set flatness?
|
|
},
|
|
setGState: function CanvasGraphics_setGState(states) {
|
|
for (var i = 0, ii = states.length; i < ii; i++) {
|
|
var state = states[i];
|
|
var key = state[0];
|
|
var value = state[1];
|
|
|
|
switch (key) {
|
|
case 'LW':
|
|
this.setLineWidth(value);
|
|
break;
|
|
case 'LC':
|
|
this.setLineCap(value);
|
|
break;
|
|
case 'LJ':
|
|
this.setLineJoin(value);
|
|
break;
|
|
case 'ML':
|
|
this.setMiterLimit(value);
|
|
break;
|
|
case 'D':
|
|
this.setDash(value[0], value[1]);
|
|
break;
|
|
case 'RI':
|
|
this.setRenderingIntent(value);
|
|
break;
|
|
case 'FL':
|
|
this.setFlatness(value);
|
|
break;
|
|
case 'Font':
|
|
this.setFont(state[1], state[2]);
|
|
break;
|
|
case 'CA':
|
|
this.current.strokeAlpha = state[1];
|
|
break;
|
|
case 'ca':
|
|
this.current.fillAlpha = state[1];
|
|
this.ctx.globalAlpha = state[1];
|
|
break;
|
|
}
|
|
}
|
|
},
|
|
save: function CanvasGraphics_save() {
|
|
this.ctx.save();
|
|
var old = this.current;
|
|
this.stateStack.push(old);
|
|
this.current = old.clone();
|
|
},
|
|
restore: function CanvasGraphics_restore() {
|
|
if ('textClipLayers' in this) {
|
|
this.completeTextClipping();
|
|
}
|
|
|
|
var prev = this.stateStack.pop();
|
|
if (prev) {
|
|
this.current = prev;
|
|
this.ctx.restore();
|
|
}
|
|
},
|
|
transform: function CanvasGraphics_transform(a, b, c, d, e, f) {
|
|
this.ctx.transform(a, b, c, d, e, f);
|
|
},
|
|
|
|
// Path
|
|
moveTo: function CanvasGraphics_moveTo(x, y) {
|
|
this.ctx.moveTo(x, y);
|
|
this.current.setCurrentPoint(x, y);
|
|
},
|
|
lineTo: function CanvasGraphics_lineTo(x, y) {
|
|
this.ctx.lineTo(x, y);
|
|
this.current.setCurrentPoint(x, y);
|
|
},
|
|
curveTo: function CanvasGraphics_curveTo(x1, y1, x2, y2, x3, y3) {
|
|
this.ctx.bezierCurveTo(x1, y1, x2, y2, x3, y3);
|
|
this.current.setCurrentPoint(x3, y3);
|
|
},
|
|
curveTo2: function CanvasGraphics_curveTo2(x2, y2, x3, y3) {
|
|
var current = this.current;
|
|
this.ctx.bezierCurveTo(current.x, current.y, x2, y2, x3, y3);
|
|
current.setCurrentPoint(x3, y3);
|
|
},
|
|
curveTo3: function CanvasGraphics_curveTo3(x1, y1, x3, y3) {
|
|
this.curveTo(x1, y1, x3, y3, x3, y3);
|
|
this.current.setCurrentPoint(x3, y3);
|
|
},
|
|
closePath: function CanvasGraphics_closePath() {
|
|
this.ctx.closePath();
|
|
},
|
|
rectangle: function CanvasGraphics_rectangle(x, y, width, height) {
|
|
this.ctx.rect(x, y, width, height);
|
|
},
|
|
stroke: function CanvasGraphics_stroke(consumePath) {
|
|
consumePath = typeof consumePath !== 'undefined' ? consumePath : true;
|
|
var ctx = this.ctx;
|
|
var strokeColor = this.current.strokeColor;
|
|
if (this.current.lineWidth === 0)
|
|
ctx.lineWidth = this.getSinglePixelWidth();
|
|
// For stroke we want to temporarily change the global alpha to the
|
|
// stroking alpha.
|
|
ctx.globalAlpha = this.current.strokeAlpha;
|
|
if (strokeColor && strokeColor.hasOwnProperty('type') &&
|
|
strokeColor.type === 'Pattern') {
|
|
// for patterns, we transform to pattern space, calculate
|
|
// the pattern, call stroke, and restore to user space
|
|
ctx.save();
|
|
ctx.strokeStyle = strokeColor.getPattern(ctx);
|
|
ctx.stroke();
|
|
ctx.restore();
|
|
} else {
|
|
ctx.stroke();
|
|
}
|
|
if (consumePath)
|
|
this.consumePath();
|
|
// Restore the global alpha to the fill alpha
|
|
ctx.globalAlpha = this.current.fillAlpha;
|
|
},
|
|
closeStroke: function CanvasGraphics_closeStroke() {
|
|
this.closePath();
|
|
this.stroke();
|
|
},
|
|
fill: function CanvasGraphics_fill(consumePath) {
|
|
consumePath = typeof consumePath !== 'undefined' ? consumePath : true;
|
|
var ctx = this.ctx;
|
|
var fillColor = this.current.fillColor;
|
|
|
|
if (fillColor && fillColor.hasOwnProperty('type') &&
|
|
fillColor.type === 'Pattern') {
|
|
ctx.save();
|
|
ctx.fillStyle = fillColor.getPattern(ctx);
|
|
ctx.fill();
|
|
ctx.restore();
|
|
} else {
|
|
ctx.fill();
|
|
}
|
|
if (consumePath)
|
|
this.consumePath();
|
|
},
|
|
eoFill: function CanvasGraphics_eoFill() {
|
|
var savedFillRule = this.setEOFillRule();
|
|
this.fill();
|
|
this.restoreFillRule(savedFillRule);
|
|
},
|
|
fillStroke: function CanvasGraphics_fillStroke() {
|
|
this.fill(false);
|
|
this.stroke(false);
|
|
|
|
this.consumePath();
|
|
},
|
|
eoFillStroke: function CanvasGraphics_eoFillStroke() {
|
|
var savedFillRule = this.setEOFillRule();
|
|
this.fillStroke();
|
|
this.restoreFillRule(savedFillRule);
|
|
},
|
|
closeFillStroke: function CanvasGraphics_closeFillStroke() {
|
|
this.closePath();
|
|
this.fillStroke();
|
|
},
|
|
closeEOFillStroke: function CanvasGraphics_closeEOFillStroke() {
|
|
var savedFillRule = this.setEOFillRule();
|
|
this.closePath();
|
|
this.fillStroke();
|
|
this.restoreFillRule(savedFillRule);
|
|
},
|
|
endPath: function CanvasGraphics_endPath() {
|
|
this.consumePath();
|
|
},
|
|
|
|
// Clipping
|
|
clip: function CanvasGraphics_clip() {
|
|
this.pendingClip = NORMAL_CLIP;
|
|
},
|
|
eoClip: function CanvasGraphics_eoClip() {
|
|
this.pendingClip = EO_CLIP;
|
|
},
|
|
|
|
// Text
|
|
beginText: function CanvasGraphics_beginText() {
|
|
this.current.textMatrix = IDENTITY_MATRIX;
|
|
this.current.x = this.current.lineX = 0;
|
|
this.current.y = this.current.lineY = 0;
|
|
},
|
|
endText: function CanvasGraphics_endText() {
|
|
if ('textClipLayers' in this) {
|
|
this.swapImageForTextClipping();
|
|
}
|
|
},
|
|
getCurrentTextClipping: function CanvasGraphics_getCurrentTextClipping() {
|
|
var ctx = this.ctx;
|
|
var transform = ctx.mozCurrentTransform;
|
|
if ('textClipLayers' in this) {
|
|
// we need to reset only font and transform
|
|
var maskCtx = this.textClipLayers.maskCtx;
|
|
maskCtx.setTransform.apply(maskCtx, transform);
|
|
maskCtx.font = ctx.font;
|
|
return maskCtx;
|
|
}
|
|
|
|
var canvasWidth = ctx.canvas.width;
|
|
var canvasHeight = ctx.canvas.height;
|
|
// keeping track of the text clipping of the separate canvas
|
|
var maskCanvas = createScratchCanvas(canvasWidth, canvasHeight);
|
|
var maskCtx = maskCanvas.getContext('2d');
|
|
maskCtx.setTransform.apply(maskCtx, transform);
|
|
maskCtx.font = ctx.font;
|
|
var textClipLayers = {
|
|
maskCanvas: maskCanvas,
|
|
maskCtx: maskCtx
|
|
};
|
|
this.textClipLayers = textClipLayers;
|
|
return maskCtx;
|
|
},
|
|
swapImageForTextClipping:
|
|
function CanvasGraphics_swapImageForTextClipping() {
|
|
var ctx = this.ctx;
|
|
var canvasWidth = ctx.canvas.width;
|
|
var canvasHeight = ctx.canvas.height;
|
|
// saving current image content and clearing whole canvas
|
|
ctx.save();
|
|
ctx.setTransform(1, 0, 0, 1, 0, 0);
|
|
var data = ctx.getImageData(0, 0, canvasWidth, canvasHeight);
|
|
this.textClipLayers.imageData = data;
|
|
ctx.clearRect(0, 0, canvasWidth, canvasHeight);
|
|
ctx.restore();
|
|
},
|
|
completeTextClipping: function CanvasGraphics_completeTextClipping() {
|
|
var ctx = this.ctx;
|
|
// applying mask to the image (result is saved in maskCanvas)
|
|
var maskCtx = this.textClipLayers.maskCtx;
|
|
maskCtx.setTransform(1, 0, 0, 1, 0, 0);
|
|
maskCtx.globalCompositeOperation = 'source-in';
|
|
maskCtx.drawImage(ctx.canvas, 0, 0);
|
|
|
|
// restoring image data and applying the result of masked drawing
|
|
ctx.save();
|
|
ctx.setTransform(1, 0, 0, 1, 0, 0);
|
|
ctx.putImageData(this.textClipLayers.imageData, 0, 0);
|
|
ctx.drawImage(this.textClipLayers.maskCanvas, 0, 0);
|
|
ctx.restore();
|
|
|
|
delete this.textClipLayers;
|
|
},
|
|
setCharSpacing: function CanvasGraphics_setCharSpacing(spacing) {
|
|
this.current.charSpacing = spacing;
|
|
},
|
|
setWordSpacing: function CanvasGraphics_setWordSpacing(spacing) {
|
|
this.current.wordSpacing = spacing;
|
|
},
|
|
setHScale: function CanvasGraphics_setHScale(scale) {
|
|
this.current.textHScale = scale / 100;
|
|
},
|
|
setLeading: function CanvasGraphics_setLeading(leading) {
|
|
this.current.leading = -leading;
|
|
},
|
|
setFont: function CanvasGraphics_setFont(fontRefName, size) {
|
|
var fontObj = this.commonObjs.get(fontRefName);
|
|
var current = this.current;
|
|
|
|
if (!fontObj)
|
|
error('Can\'t find font for ' + fontRefName);
|
|
|
|
current.fontMatrix = fontObj.fontMatrix ? fontObj.fontMatrix :
|
|
FONT_IDENTITY_MATRIX;
|
|
|
|
// A valid matrix needs all main diagonal elements to be non-zero
|
|
// This also ensures we bypass FF bugzilla bug #719844.
|
|
if (current.fontMatrix[0] === 0 ||
|
|
current.fontMatrix[3] === 0) {
|
|
warn('Invalid font matrix for font ' + fontRefName);
|
|
}
|
|
|
|
// The spec for Tf (setFont) says that 'size' specifies the font 'scale',
|
|
// and in some docs this can be negative (inverted x-y axes).
|
|
if (size < 0) {
|
|
size = -size;
|
|
current.fontDirection = -1;
|
|
} else {
|
|
current.fontDirection = 1;
|
|
}
|
|
|
|
this.current.font = fontObj;
|
|
this.current.fontSize = size;
|
|
|
|
if (fontObj.coded)
|
|
return; // we don't need ctx.font for Type3 fonts
|
|
|
|
var name = fontObj.loadedName || 'sans-serif';
|
|
var bold = fontObj.black ? (fontObj.bold ? 'bolder' : 'bold') :
|
|
(fontObj.bold ? 'bold' : 'normal');
|
|
|
|
var italic = fontObj.italic ? 'italic' : 'normal';
|
|
var typeface = '"' + name + '", ' + fontObj.fallbackName;
|
|
|
|
// Some font backends cannot handle fonts below certain size.
|
|
// Keeping the font at minimal size and using the fontSizeScale to change
|
|
// the current transformation matrix before the fillText/strokeText.
|
|
// See https://bugzilla.mozilla.org/show_bug.cgi?id=726227
|
|
var browserFontSize = size >= MIN_FONT_SIZE ? size : MIN_FONT_SIZE;
|
|
this.current.fontSizeScale = browserFontSize != MIN_FONT_SIZE ? 1.0 :
|
|
size / MIN_FONT_SIZE;
|
|
|
|
var rule = italic + ' ' + bold + ' ' + browserFontSize + 'px ' + typeface;
|
|
this.ctx.font = rule;
|
|
},
|
|
setTextRenderingMode: function CanvasGraphics_setTextRenderingMode(mode) {
|
|
this.current.textRenderingMode = mode;
|
|
},
|
|
setTextRise: function CanvasGraphics_setTextRise(rise) {
|
|
this.current.textRise = rise;
|
|
},
|
|
moveText: function CanvasGraphics_moveText(x, y) {
|
|
this.current.x = this.current.lineX += x;
|
|
this.current.y = this.current.lineY += y;
|
|
},
|
|
setLeadingMoveText: function CanvasGraphics_setLeadingMoveText(x, y) {
|
|
this.setLeading(-y);
|
|
this.moveText(x, y);
|
|
},
|
|
setTextMatrix: function CanvasGraphics_setTextMatrix(a, b, c, d, e, f) {
|
|
this.current.textMatrix = [a, b, c, d, e, f];
|
|
|
|
this.current.x = this.current.lineX = 0;
|
|
this.current.y = this.current.lineY = 0;
|
|
},
|
|
nextLine: function CanvasGraphics_nextLine() {
|
|
this.moveText(0, this.current.leading);
|
|
},
|
|
applyTextTransforms: function CanvasGraphics_applyTextTransforms() {
|
|
var ctx = this.ctx;
|
|
var current = this.current;
|
|
ctx.transform.apply(ctx, current.textMatrix);
|
|
ctx.translate(current.x, current.y + current.textRise);
|
|
if (current.fontDirection > 0) {
|
|
ctx.scale(current.textHScale, -1);
|
|
} else {
|
|
ctx.scale(-current.textHScale, 1);
|
|
}
|
|
},
|
|
createTextGeometry: function CanvasGraphics_createTextGeometry() {
|
|
var geometry = {};
|
|
var ctx = this.ctx;
|
|
var font = this.current.font;
|
|
var ctxMatrix = ctx.mozCurrentTransform;
|
|
if (ctxMatrix) {
|
|
var bl = Util.applyTransform([0, 0], ctxMatrix);
|
|
var tr = Util.applyTransform([1, 1], ctxMatrix);
|
|
geometry.x = bl[0];
|
|
geometry.y = bl[1];
|
|
geometry.hScale = tr[0] - bl[0];
|
|
geometry.vScale = tr[1] - bl[1];
|
|
}
|
|
geometry.spaceWidth = font.spaceWidth;
|
|
geometry.fontName = font.loadedName;
|
|
geometry.fontFamily = font.fallbackName;
|
|
geometry.fontSize = this.current.fontSize;
|
|
return geometry;
|
|
},
|
|
|
|
showText: function CanvasGraphics_showText(str, skipTextSelection) {
|
|
var ctx = this.ctx;
|
|
var current = this.current;
|
|
var font = current.font;
|
|
var glyphs = font.charsToGlyphs(str);
|
|
var fontSize = current.fontSize;
|
|
var fontSizeScale = current.fontSizeScale;
|
|
var charSpacing = current.charSpacing;
|
|
var wordSpacing = current.wordSpacing;
|
|
var textHScale = current.textHScale * current.fontDirection;
|
|
var fontMatrix = current.fontMatrix || FONT_IDENTITY_MATRIX;
|
|
var glyphsLength = glyphs.length;
|
|
var textLayer = this.textLayer;
|
|
var geom;
|
|
var textSelection = textLayer && !skipTextSelection ? true : false;
|
|
var textRenderingMode = current.textRenderingMode;
|
|
var canvasWidth = 0.0;
|
|
var vertical = font.vertical;
|
|
var defaultVMetrics = font.defaultVMetrics;
|
|
|
|
// Type3 fonts - each glyph is a "mini-PDF"
|
|
if (font.coded) {
|
|
ctx.save();
|
|
ctx.transform.apply(ctx, current.textMatrix);
|
|
ctx.translate(current.x, current.y);
|
|
|
|
ctx.scale(textHScale, 1);
|
|
|
|
if (textSelection) {
|
|
this.save();
|
|
ctx.scale(1, -1);
|
|
geom = this.createTextGeometry();
|
|
this.restore();
|
|
}
|
|
for (var i = 0; i < glyphsLength; ++i) {
|
|
|
|
var glyph = glyphs[i];
|
|
if (glyph === null) {
|
|
// word break
|
|
this.ctx.translate(wordSpacing, 0);
|
|
current.x += wordSpacing * textHScale;
|
|
continue;
|
|
}
|
|
|
|
this.save();
|
|
ctx.scale(fontSize, fontSize);
|
|
ctx.transform.apply(ctx, fontMatrix);
|
|
this.executeOperatorList(glyph.operatorList);
|
|
this.restore();
|
|
|
|
var transformed = Util.applyTransform([glyph.width, 0], fontMatrix);
|
|
var width = (transformed[0] * fontSize + charSpacing) *
|
|
current.fontDirection;
|
|
|
|
ctx.translate(width, 0);
|
|
current.x += width * textHScale;
|
|
|
|
canvasWidth += width;
|
|
}
|
|
ctx.restore();
|
|
} else {
|
|
ctx.save();
|
|
this.applyTextTransforms();
|
|
|
|
var lineWidth = current.lineWidth;
|
|
var a1 = current.textMatrix[0], b1 = current.textMatrix[1];
|
|
var scale = Math.sqrt(a1 * a1 + b1 * b1);
|
|
if (scale === 0 || lineWidth === 0)
|
|
lineWidth = this.getSinglePixelWidth();
|
|
else
|
|
lineWidth /= scale;
|
|
|
|
if (textSelection)
|
|
geom = this.createTextGeometry();
|
|
|
|
if (fontSizeScale != 1.0) {
|
|
ctx.scale(fontSizeScale, fontSizeScale);
|
|
lineWidth /= fontSizeScale;
|
|
}
|
|
|
|
ctx.lineWidth = lineWidth;
|
|
|
|
var x = 0;
|
|
for (var i = 0; i < glyphsLength; ++i) {
|
|
var glyph = glyphs[i];
|
|
if (glyph === null) {
|
|
// word break
|
|
x += current.fontDirection * wordSpacing;
|
|
continue;
|
|
}
|
|
|
|
var character = glyph.fontChar;
|
|
var vmetric = glyph.vmetric || defaultVMetrics;
|
|
if (vertical) {
|
|
var vx = vmetric[1] * fontSize * current.fontMatrix[0];
|
|
var vy = vmetric[2] * fontSize * current.fontMatrix[0];
|
|
}
|
|
var width = vmetric ? -vmetric[0] : glyph.width;
|
|
var charWidth = width * fontSize * current.fontMatrix[0] +
|
|
charSpacing * current.fontDirection;
|
|
|
|
if (!glyph.disabled) {
|
|
if (vertical) {
|
|
var scaledX = vx / fontSizeScale;
|
|
var scaledY = (x + vy) / fontSizeScale;
|
|
} else {
|
|
var scaledX = x / fontSizeScale;
|
|
var scaledY = 0;
|
|
}
|
|
switch (textRenderingMode) {
|
|
default: // other unsupported rendering modes
|
|
case TextRenderingMode.FILL:
|
|
case TextRenderingMode.FILL_ADD_TO_PATH:
|
|
ctx.fillText(character, scaledX, scaledY);
|
|
break;
|
|
case TextRenderingMode.STROKE:
|
|
case TextRenderingMode.STROKE_ADD_TO_PATH:
|
|
ctx.strokeText(character, scaledX, scaledY);
|
|
break;
|
|
case TextRenderingMode.FILL_STROKE:
|
|
case TextRenderingMode.FILL_STROKE_ADD_TO_PATH:
|
|
ctx.fillText(character, scaledX, scaledY);
|
|
ctx.strokeText(character, scaledX, scaledY);
|
|
break;
|
|
case TextRenderingMode.INVISIBLE:
|
|
case TextRenderingMode.ADD_TO_PATH:
|
|
break;
|
|
}
|
|
if (textRenderingMode & TextRenderingMode.ADD_TO_PATH_FLAG) {
|
|
var clipCtx = this.getCurrentTextClipping();
|
|
clipCtx.fillText(character, scaledX, scaledY);
|
|
}
|
|
}
|
|
|
|
x += charWidth;
|
|
|
|
canvasWidth += charWidth;
|
|
}
|
|
if (vertical) {
|
|
current.y -= x * textHScale;
|
|
} else {
|
|
current.x += x * textHScale;
|
|
}
|
|
ctx.restore();
|
|
}
|
|
|
|
if (textSelection) {
|
|
geom.canvasWidth = canvasWidth;
|
|
if (vertical) {
|
|
var vmetric = font.defaultVMetrics;
|
|
geom.x -= vmetric[1] * fontSize * current.fontMatrix[0] /
|
|
fontSizeScale * geom.hScale;
|
|
geom.y += vmetric[2] * fontSize * current.fontMatrix[0] /
|
|
fontSizeScale * geom.vScale;
|
|
}
|
|
this.textLayer.appendText(geom);
|
|
}
|
|
|
|
return canvasWidth;
|
|
},
|
|
showSpacedText: function CanvasGraphics_showSpacedText(arr) {
|
|
var ctx = this.ctx;
|
|
var current = this.current;
|
|
var font = current.font;
|
|
var fontSize = current.fontSize;
|
|
var textHScale = current.textHScale * (current.fontMatrix && !font.coded ?
|
|
current.fontMatrix[0] : FONT_IDENTITY_MATRIX[0]) *
|
|
current.fontDirection;
|
|
var arrLength = arr.length;
|
|
var textLayer = this.textLayer;
|
|
var geom;
|
|
var canvasWidth = 0.0;
|
|
var textSelection = textLayer ? true : false;
|
|
var vertical = font.vertical;
|
|
var spacingAccumulator = 0;
|
|
|
|
if (textSelection) {
|
|
ctx.save();
|
|
this.applyTextTransforms();
|
|
geom = this.createTextGeometry();
|
|
ctx.restore();
|
|
}
|
|
|
|
for (var i = 0; i < arrLength; ++i) {
|
|
var e = arr[i];
|
|
if (isNum(e)) {
|
|
var spacingLength = -e * fontSize * textHScale;
|
|
if (vertical) {
|
|
current.y += spacingLength;
|
|
} else {
|
|
current.x += spacingLength;
|
|
}
|
|
|
|
if (textSelection)
|
|
spacingAccumulator += spacingLength;
|
|
} else if (isString(e)) {
|
|
var shownCanvasWidth = this.showText(e, true);
|
|
|
|
if (textSelection) {
|
|
canvasWidth += spacingAccumulator + shownCanvasWidth;
|
|
spacingAccumulator = 0;
|
|
}
|
|
} else {
|
|
error('TJ array element ' + e + ' is not string or num');
|
|
}
|
|
}
|
|
|
|
if (textSelection) {
|
|
geom.canvasWidth = canvasWidth;
|
|
if (vertical) {
|
|
var fontSizeScale = current.fontSizeScale;
|
|
var vmetric = font.defaultVMetrics;
|
|
geom.x -= vmetric[1] * fontSize * current.fontMatrix[0] /
|
|
fontSizeScale * geom.hScale;
|
|
geom.y += vmetric[2] * fontSize * current.fontMatrix[0] /
|
|
fontSizeScale * geom.vScale;
|
|
}
|
|
this.textLayer.appendText(geom);
|
|
}
|
|
},
|
|
nextLineShowText: function CanvasGraphics_nextLineShowText(text) {
|
|
this.nextLine();
|
|
this.showText(text);
|
|
},
|
|
nextLineSetSpacingShowText:
|
|
function CanvasGraphics_nextLineSetSpacingShowText(wordSpacing,
|
|
charSpacing,
|
|
text) {
|
|
this.setWordSpacing(wordSpacing);
|
|
this.setCharSpacing(charSpacing);
|
|
this.nextLineShowText(text);
|
|
},
|
|
|
|
// Type3 fonts
|
|
setCharWidth: function CanvasGraphics_setCharWidth(xWidth, yWidth) {
|
|
// We can safely ignore this since the width should be the same
|
|
// as the width in the Widths array.
|
|
},
|
|
setCharWidthAndBounds: function CanvasGraphics_setCharWidthAndBounds(xWidth,
|
|
yWidth,
|
|
llx,
|
|
lly,
|
|
urx,
|
|
ury) {
|
|
// TODO According to the spec we're also suppose to ignore any operators
|
|
// that set color or include images while processing this type3 font.
|
|
this.rectangle(llx, lly, urx - llx, ury - lly);
|
|
this.clip();
|
|
this.endPath();
|
|
},
|
|
|
|
// Color
|
|
setStrokeColorSpace: function CanvasGraphics_setStrokeColorSpace(raw) {
|
|
this.current.strokeColorSpace = ColorSpace.fromIR(raw);
|
|
},
|
|
setFillColorSpace: function CanvasGraphics_setFillColorSpace(raw) {
|
|
this.current.fillColorSpace = ColorSpace.fromIR(raw);
|
|
},
|
|
setStrokeColor: function CanvasGraphics_setStrokeColor(/*...*/) {
|
|
var cs = this.current.strokeColorSpace;
|
|
var rgbColor = cs.getRgb(arguments, 0);
|
|
var color = Util.makeCssRgb(rgbColor);
|
|
this.ctx.strokeStyle = color;
|
|
this.current.strokeColor = color;
|
|
},
|
|
getColorN_Pattern: function CanvasGraphics_getColorN_Pattern(IR, cs) {
|
|
if (IR[0] == 'TilingPattern') {
|
|
var args = IR[1];
|
|
var base = cs.base;
|
|
var color;
|
|
if (base) {
|
|
var baseComps = base.numComps;
|
|
|
|
color = base.getRgb(args, 0);
|
|
}
|
|
var pattern = new TilingPattern(IR, color, this.ctx, this.objs);
|
|
} else if (IR[0] == 'RadialAxial' || IR[0] == 'Dummy') {
|
|
var pattern = Pattern.shadingFromIR(IR);
|
|
} else {
|
|
error('Unkown IR type ' + IR[0]);
|
|
}
|
|
return pattern;
|
|
},
|
|
setStrokeColorN: function CanvasGraphics_setStrokeColorN(/*...*/) {
|
|
var cs = this.current.strokeColorSpace;
|
|
|
|
if (cs.name == 'Pattern') {
|
|
this.current.strokeColor = this.getColorN_Pattern(arguments, cs);
|
|
} else {
|
|
this.setStrokeColor.apply(this, arguments);
|
|
}
|
|
},
|
|
setFillColor: function CanvasGraphics_setFillColor(/*...*/) {
|
|
var cs = this.current.fillColorSpace;
|
|
var rgbColor = cs.getRgb(arguments, 0);
|
|
var color = Util.makeCssRgb(rgbColor);
|
|
this.ctx.fillStyle = color;
|
|
this.current.fillColor = color;
|
|
},
|
|
setFillColorN: function CanvasGraphics_setFillColorN(/*...*/) {
|
|
var cs = this.current.fillColorSpace;
|
|
|
|
if (cs.name == 'Pattern') {
|
|
this.current.fillColor = this.getColorN_Pattern(arguments, cs);
|
|
} else {
|
|
this.setFillColor.apply(this, arguments);
|
|
}
|
|
},
|
|
setStrokeGray: function CanvasGraphics_setStrokeGray(gray) {
|
|
if (!(this.current.strokeColorSpace instanceof DeviceGrayCS))
|
|
this.current.strokeColorSpace = new DeviceGrayCS();
|
|
|
|
var rgbColor = this.current.strokeColorSpace.getRgb(arguments, 0);
|
|
var color = Util.makeCssRgb(rgbColor);
|
|
this.ctx.strokeStyle = color;
|
|
this.current.strokeColor = color;
|
|
},
|
|
setFillGray: function CanvasGraphics_setFillGray(gray) {
|
|
if (!(this.current.fillColorSpace instanceof DeviceGrayCS))
|
|
this.current.fillColorSpace = new DeviceGrayCS();
|
|
|
|
var rgbColor = this.current.fillColorSpace.getRgb(arguments, 0);
|
|
var color = Util.makeCssRgb(rgbColor);
|
|
this.ctx.fillStyle = color;
|
|
this.current.fillColor = color;
|
|
},
|
|
setStrokeRGBColor: function CanvasGraphics_setStrokeRGBColor(r, g, b) {
|
|
if (!(this.current.strokeColorSpace instanceof DeviceRgbCS))
|
|
this.current.strokeColorSpace = new DeviceRgbCS();
|
|
|
|
var rgbColor = this.current.strokeColorSpace.getRgb(arguments, 0);
|
|
var color = Util.makeCssRgb(rgbColor);
|
|
this.ctx.strokeStyle = color;
|
|
this.current.strokeColor = color;
|
|
},
|
|
setFillRGBColor: function CanvasGraphics_setFillRGBColor(r, g, b) {
|
|
if (!(this.current.fillColorSpace instanceof DeviceRgbCS))
|
|
this.current.fillColorSpace = new DeviceRgbCS();
|
|
|
|
var rgbColor = this.current.fillColorSpace.getRgb(arguments, 0);
|
|
var color = Util.makeCssRgb(rgbColor);
|
|
this.ctx.fillStyle = color;
|
|
this.current.fillColor = color;
|
|
},
|
|
setStrokeCMYKColor: function CanvasGraphics_setStrokeCMYKColor(c, m, y, k) {
|
|
if (!(this.current.strokeColorSpace instanceof DeviceCmykCS))
|
|
this.current.strokeColorSpace = new DeviceCmykCS();
|
|
|
|
var color = Util.makeCssCmyk(arguments);
|
|
this.ctx.strokeStyle = color;
|
|
this.current.strokeColor = color;
|
|
},
|
|
setFillCMYKColor: function CanvasGraphics_setFillCMYKColor(c, m, y, k) {
|
|
if (!(this.current.fillColorSpace instanceof DeviceCmykCS))
|
|
this.current.fillColorSpace = new DeviceCmykCS();
|
|
|
|
var color = Util.makeCssCmyk(arguments);
|
|
this.ctx.fillStyle = color;
|
|
this.current.fillColor = color;
|
|
},
|
|
|
|
shadingFill: function CanvasGraphics_shadingFill(patternIR) {
|
|
var ctx = this.ctx;
|
|
|
|
this.save();
|
|
var pattern = Pattern.shadingFromIR(patternIR);
|
|
ctx.fillStyle = pattern.getPattern(ctx);
|
|
|
|
var inv = ctx.mozCurrentTransformInverse;
|
|
if (inv) {
|
|
var canvas = ctx.canvas;
|
|
var width = canvas.width;
|
|
var height = canvas.height;
|
|
|
|
var bl = Util.applyTransform([0, 0], inv);
|
|
var br = Util.applyTransform([0, height], inv);
|
|
var ul = Util.applyTransform([width, 0], inv);
|
|
var ur = Util.applyTransform([width, height], inv);
|
|
|
|
var x0 = Math.min(bl[0], br[0], ul[0], ur[0]);
|
|
var y0 = Math.min(bl[1], br[1], ul[1], ur[1]);
|
|
var x1 = Math.max(bl[0], br[0], ul[0], ur[0]);
|
|
var y1 = Math.max(bl[1], br[1], ul[1], ur[1]);
|
|
|
|
this.ctx.fillRect(x0, y0, x1 - x0, y1 - y0);
|
|
} else {
|
|
// HACK to draw the gradient onto an infinite rectangle.
|
|
// PDF gradients are drawn across the entire image while
|
|
// Canvas only allows gradients to be drawn in a rectangle
|
|
// The following bug should allow us to remove this.
|
|
// https://bugzilla.mozilla.org/show_bug.cgi?id=664884
|
|
|
|
this.ctx.fillRect(-1e10, -1e10, 2e10, 2e10);
|
|
}
|
|
|
|
this.restore();
|
|
},
|
|
|
|
// Images
|
|
beginInlineImage: function CanvasGraphics_beginInlineImage() {
|
|
error('Should not call beginInlineImage');
|
|
},
|
|
beginImageData: function CanvasGraphics_beginImageData() {
|
|
error('Should not call beginImageData');
|
|
},
|
|
|
|
paintFormXObjectBegin: function CanvasGraphics_paintFormXObjectBegin(matrix,
|
|
bbox) {
|
|
this.save();
|
|
this.current.paintFormXObjectDepth++;
|
|
|
|
if (matrix && isArray(matrix) && 6 == matrix.length)
|
|
this.transform.apply(this, matrix);
|
|
|
|
if (bbox && isArray(bbox) && 4 == bbox.length) {
|
|
var width = bbox[2] - bbox[0];
|
|
var height = bbox[3] - bbox[1];
|
|
this.rectangle(bbox[0], bbox[1], width, height);
|
|
this.clip();
|
|
this.endPath();
|
|
}
|
|
},
|
|
|
|
paintFormXObjectEnd: function CanvasGraphics_paintFormXObjectEnd() {
|
|
var depth = this.current.paintFormXObjectDepth;
|
|
do {
|
|
this.restore();
|
|
// some pdf don't close all restores inside object
|
|
// closing those for them
|
|
} while (this.current.paintFormXObjectDepth >= depth);
|
|
},
|
|
|
|
paintJpegXObject: function CanvasGraphics_paintJpegXObject(objId, w, h) {
|
|
var domImage = this.objs.get(objId);
|
|
if (!domImage) {
|
|
error('Dependent image isn\'t ready yet');
|
|
}
|
|
|
|
this.save();
|
|
|
|
var ctx = this.ctx;
|
|
// scale the image to the unit square
|
|
ctx.scale(1 / w, -1 / h);
|
|
|
|
ctx.drawImage(domImage, 0, 0, domImage.width, domImage.height,
|
|
0, -h, w, h);
|
|
if (this.imageLayer) {
|
|
var currentTransform = ctx.mozCurrentTransformInverse;
|
|
var position = this.getCanvasPosition(0, 0);
|
|
this.imageLayer.appendImage({
|
|
objId: objId,
|
|
left: position[0],
|
|
top: position[1],
|
|
width: w / currentTransform[0],
|
|
height: h / currentTransform[3]
|
|
});
|
|
}
|
|
this.restore();
|
|
},
|
|
|
|
paintImageMaskXObject: function CanvasGraphics_paintImageMaskXObject(
|
|
imgArray, inverseDecode, width, height) {
|
|
var ctx = this.ctx;
|
|
var tmpCanvas = createScratchCanvas(width, height);
|
|
var tmpCtx = tmpCanvas.getContext('2d');
|
|
|
|
var fillColor = this.current.fillColor;
|
|
tmpCtx.fillStyle = (fillColor && fillColor.hasOwnProperty('type') &&
|
|
fillColor.type === 'Pattern') ?
|
|
fillColor.getPattern(tmpCtx) : fillColor;
|
|
tmpCtx.fillRect(0, 0, width, height);
|
|
|
|
var imgData = tmpCtx.getImageData(0, 0, width, height);
|
|
var pixels = imgData.data;
|
|
|
|
applyStencilMask(imgArray, width, height, inverseDecode, pixels);
|
|
|
|
this.paintInlineImageXObject(imgData);
|
|
},
|
|
|
|
paintImageMaskXObjectGroup:
|
|
function CanvasGraphics_paintImageMaskXObjectGroup(images) {
|
|
var ctx = this.ctx;
|
|
var tmpCanvasWidth = 0, tmpCanvasHeight = 0, tmpCanvas, tmpCtx;
|
|
for (var i = 0, ii = images.length; i < ii; i++) {
|
|
var image = images[i];
|
|
var w = image.width, h = image.height;
|
|
if (w > tmpCanvasWidth || h > tmpCanvasHeight) {
|
|
tmpCanvasWidth = Math.max(w, tmpCanvasWidth);
|
|
tmpCanvasHeight = Math.max(h, tmpCanvasHeight);
|
|
tmpCanvas = createScratchCanvas(tmpCanvasWidth, tmpCanvasHeight);
|
|
tmpCtx = tmpCanvas.getContext('2d');
|
|
|
|
var fillColor = this.current.fillColor;
|
|
tmpCtx.fillStyle = (fillColor && fillColor.hasOwnProperty('type') &&
|
|
fillColor.type === 'Pattern') ?
|
|
fillColor.getPattern(tmpCtx) : fillColor;
|
|
}
|
|
tmpCtx.fillRect(0, 0, w, h);
|
|
|
|
var imgData = tmpCtx.getImageData(0, 0, w, h);
|
|
var pixels = imgData.data;
|
|
|
|
applyStencilMask(image.data, w, h, image.inverseDecode, pixels);
|
|
|
|
tmpCtx.putImageData(imgData, 0, 0);
|
|
|
|
ctx.save();
|
|
ctx.transform.apply(ctx, image.transform);
|
|
ctx.scale(1, -1);
|
|
ctx.drawImage(tmpCanvas, 0, 0, w, h,
|
|
0, -1, 1, 1);
|
|
ctx.restore();
|
|
}
|
|
},
|
|
|
|
paintImageXObject: function CanvasGraphics_paintImageXObject(objId) {
|
|
var imgData = this.objs.get(objId);
|
|
if (!imgData)
|
|
error('Dependent image isn\'t ready yet');
|
|
|
|
this.paintInlineImageXObject(imgData);
|
|
},
|
|
|
|
paintInlineImageXObject:
|
|
function CanvasGraphics_paintInlineImageXObject(imgData) {
|
|
var width = imgData.width;
|
|
var height = imgData.height;
|
|
var ctx = this.ctx;
|
|
this.save();
|
|
// scale the image to the unit square
|
|
ctx.scale(1 / width, -1 / height);
|
|
|
|
var currentTransform = ctx.mozCurrentTransformInverse;
|
|
var widthScale = Math.max(Math.abs(currentTransform[0]), 1);
|
|
var heightScale = Math.max(Math.abs(currentTransform[3]), 1);
|
|
var tmpCanvas = createScratchCanvas(width, height);
|
|
var tmpCtx = tmpCanvas.getContext('2d');
|
|
|
|
if (widthScale > 2 || heightScale > 2) {
|
|
// canvas does not resize well large images to small -- using simple
|
|
// algorithm to perform pre-scaling
|
|
tmpCanvas = prescaleImage(imgData.data,
|
|
width, height,
|
|
widthScale, heightScale);
|
|
ctx.drawImage(tmpCanvas, 0, 0, tmpCanvas.width, tmpCanvas.height,
|
|
0, -height, width, height);
|
|
} else {
|
|
if (typeof ImageData !== 'undefined' && imgData instanceof ImageData) {
|
|
tmpCtx.putImageData(imgData, 0, 0);
|
|
} else {
|
|
putBinaryImageData(tmpCtx, imgData.data, width, height);
|
|
}
|
|
ctx.drawImage(tmpCanvas, 0, -height);
|
|
}
|
|
|
|
if (this.imageLayer) {
|
|
var position = this.getCanvasPosition(0, -height);
|
|
this.imageLayer.appendImage({
|
|
imgData: imgData,
|
|
left: position[0],
|
|
top: position[1],
|
|
width: width / currentTransform[0],
|
|
height: height / currentTransform[3]
|
|
});
|
|
}
|
|
this.restore();
|
|
},
|
|
|
|
paintInlineImageXObjectGroup:
|
|
function CanvasGraphics_paintInlineImageXObjectGroup(imgData, map) {
|
|
var ctx = this.ctx;
|
|
var w = imgData.width;
|
|
var h = imgData.height;
|
|
|
|
var tmpCanvas = createScratchCanvas(w, h);
|
|
var tmpCtx = tmpCanvas.getContext('2d');
|
|
putBinaryImageData(tmpCtx, imgData.data, w, h);
|
|
|
|
for (var i = 0, ii = map.length; i < ii; i++) {
|
|
var entry = map[i];
|
|
ctx.save();
|
|
ctx.transform.apply(ctx, entry.transform);
|
|
ctx.scale(1, -1);
|
|
ctx.drawImage(tmpCanvas, entry.x, entry.y, entry.w, entry.h,
|
|
0, -1, 1, 1);
|
|
if (this.imageLayer) {
|
|
var position = this.getCanvasPosition(entry.x, entry.y);
|
|
this.imageLayer.appendImage({
|
|
imgData: imgData,
|
|
left: position[0],
|
|
top: position[1],
|
|
width: w,
|
|
height: h
|
|
});
|
|
}
|
|
ctx.restore();
|
|
}
|
|
},
|
|
|
|
// Marked content
|
|
|
|
markPoint: function CanvasGraphics_markPoint(tag) {
|
|
// TODO Marked content.
|
|
},
|
|
markPointProps: function CanvasGraphics_markPointProps(tag, properties) {
|
|
// TODO Marked content.
|
|
},
|
|
beginMarkedContent: function CanvasGraphics_beginMarkedContent(tag) {
|
|
// TODO Marked content.
|
|
},
|
|
beginMarkedContentProps: function CanvasGraphics_beginMarkedContentProps(
|
|
tag, properties) {
|
|
// TODO Marked content.
|
|
},
|
|
endMarkedContent: function CanvasGraphics_endMarkedContent() {
|
|
// TODO Marked content.
|
|
},
|
|
|
|
// Compatibility
|
|
|
|
beginCompat: function CanvasGraphics_beginCompat() {
|
|
// TODO ignore undefined operators (should we do that anyway?)
|
|
},
|
|
endCompat: function CanvasGraphics_endCompat() {
|
|
// TODO stop ignoring undefined operators
|
|
},
|
|
|
|
// Helper functions
|
|
|
|
consumePath: function CanvasGraphics_consumePath() {
|
|
if (this.pendingClip) {
|
|
var savedFillRule = null;
|
|
if (this.pendingClip == EO_CLIP)
|
|
savedFillRule = this.setEOFillRule();
|
|
|
|
this.ctx.clip();
|
|
|
|
this.pendingClip = null;
|
|
if (savedFillRule !== null)
|
|
this.restoreFillRule(savedFillRule);
|
|
}
|
|
this.ctx.beginPath();
|
|
},
|
|
// We generally keep the canvas context set for
|
|
// nonzero-winding, and just set evenodd for the operations
|
|
// that need them.
|
|
setEOFillRule: function CanvasGraphics_setEOFillRule() {
|
|
var savedFillRule = this.ctx.mozFillRule;
|
|
this.ctx.mozFillRule = 'evenodd';
|
|
return savedFillRule;
|
|
},
|
|
restoreFillRule: function CanvasGraphics_restoreFillRule(rule) {
|
|
this.ctx.mozFillRule = rule;
|
|
},
|
|
getSinglePixelWidth: function CanvasGraphics_getSinglePixelWidth(scale) {
|
|
var inverse = this.ctx.mozCurrentTransformInverse;
|
|
// max of the current horizontal and vertical scale
|
|
return Math.sqrt(Math.max(
|
|
(inverse[0] * inverse[0] + inverse[1] * inverse[1]),
|
|
(inverse[2] * inverse[2] + inverse[3] * inverse[3])));
|
|
},
|
|
getCanvasPosition: function CanvasGraphics_getCanvasPosition(x, y) {
|
|
var transform = this.ctx.mozCurrentTransform;
|
|
return [
|
|
transform[0] * x + transform[2] * y + transform[4],
|
|
transform[1] * x + transform[3] * y + transform[5]
|
|
];
|
|
}
|
|
};
|
|
|
|
return CanvasGraphics;
|
|
})();
|
|
|