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Generic build of PDF.js library.
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pdfjs-dist/src/canvas.js

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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* Copyright 2012 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* globals ColorSpace, DeviceCmykCS, DeviceGrayCS, DeviceRgbCS, error,
FONT_IDENTITY_MATRIX, IDENTITY_MATRIX, ImageData, isArray, isNum,
isString, Pattern, TilingPattern, TODO, Util, warn, assert */
'use strict';
// <canvas> contexts store most of the state we need natively.
// However, PDF needs a bit more state, which we store here.
var TextRenderingMode = {
FILL: 0,
STROKE: 1,
FILL_STROKE: 2,
INVISIBLE: 3,
FILL_ADD_TO_PATH: 4,
STROKE_ADD_TO_PATH: 5,
FILL_STROKE_ADD_TO_PATH: 6,
ADD_TO_PATH: 7,
ADD_TO_PATH_FLAG: 4
};
// Minimal font size that would be used during canvas fillText operations.
var MIN_FONT_SIZE = 1;
function createScratchCanvas(width, height) {
var canvas = document.createElement('canvas');
canvas.width = width;
canvas.height = height;
return canvas;
}
function addContextCurrentTransform(ctx) {
// If the context doesn't expose a `mozCurrentTransform`, add a JS based on.
if (!ctx.mozCurrentTransform) {
// Store the original context
ctx._scaleX = ctx._scaleX || 1.0;
ctx._scaleY = ctx._scaleY || 1.0;
ctx._originalSave = ctx.save;
ctx._originalRestore = ctx.restore;
ctx._originalRotate = ctx.rotate;
ctx._originalScale = ctx.scale;
ctx._originalTranslate = ctx.translate;
ctx._originalTransform = ctx.transform;
ctx._transformMatrix = [ctx._scaleX, 0, 0, ctx._scaleY, 0, 0];
ctx._transformStack = [];
Object.defineProperty(ctx, 'mozCurrentTransform', {
get: function getCurrentTransform() {
return this._transformMatrix;
}
});
Object.defineProperty(ctx, 'mozCurrentTransformInverse', {
get: function getCurrentTransformInverse() {
// Calculation done using WolframAlpha:
// http://www.wolframalpha.com/input/?
// i=Inverse+{{a%2C+c%2C+e}%2C+{b%2C+d%2C+f}%2C+{0%2C+0%2C+1}}
var m = this._transformMatrix;
var a = m[0], b = m[1], c = m[2], d = m[3], e = m[4], f = m[5];
var ad_bc = a * d - b * c;
var bc_ad = b * c - a * d;
return [
d / ad_bc,
b / bc_ad,
c / bc_ad,
a / ad_bc,
(d * e - c * f) / bc_ad,
(b * e - a * f) / ad_bc
];
}
});
ctx.save = function ctxSave() {
var old = this._transformMatrix;
this._transformStack.push(old);
this._transformMatrix = old.slice(0, 6);
this._originalSave();
};
ctx.restore = function ctxRestore() {
var prev = this._transformStack.pop();
if (prev) {
this._transformMatrix = prev;
this._originalRestore();
}
};
ctx.translate = function ctxTranslate(x, y) {
var m = this._transformMatrix;
m[4] = m[0] * x + m[2] * y + m[4];
m[5] = m[1] * x + m[3] * y + m[5];
this._originalTranslate(x, y);
};
ctx.scale = function ctxScale(x, y) {
var m = this._transformMatrix;
m[0] = m[0] * x;
m[1] = m[1] * x;
m[2] = m[2] * y;
m[3] = m[3] * y;
this._originalScale(x, y);
};
ctx.transform = function ctxTransform(a, b, c, d, e, f) {
var m = this._transformMatrix;
this._transformMatrix = [
m[0] * a + m[2] * b,
m[1] * a + m[3] * b,
m[0] * c + m[2] * d,
m[1] * c + m[3] * d,
m[0] * e + m[2] * f + m[4],
m[1] * e + m[3] * f + m[5]
];
ctx._originalTransform(a, b, c, d, e, f);
};
ctx.rotate = function ctxRotate(angle) {
var cosValue = Math.cos(angle);
var sinValue = Math.sin(angle);
var m = this._transformMatrix;
this._transformMatrix = [
m[0] * cosValue + m[2] * sinValue,
m[1] * cosValue + m[3] * sinValue,
m[0] * (-sinValue) + m[2] * cosValue,
m[1] * (-sinValue) + m[3] * cosValue,
m[4],
m[5]
];
this._originalRotate(angle);
};
}
}
var CanvasExtraState = (function CanvasExtraStateClosure() {
function CanvasExtraState(old) {
// Are soft masks and alpha values shapes or opacities?
this.alphaIsShape = false;
this.fontSize = 0;
this.fontSizeScale = 1;
this.textMatrix = IDENTITY_MATRIX;
this.fontMatrix = FONT_IDENTITY_MATRIX;
this.leading = 0;
// Current point (in user coordinates)
this.x = 0;
this.y = 0;
// Start of text line (in text coordinates)
this.lineX = 0;
this.lineY = 0;
// Character and word spacing
this.charSpacing = 0;
this.wordSpacing = 0;
this.textHScale = 1;
this.textRenderingMode = TextRenderingMode.FILL;
this.textRise = 0;
// Color spaces
this.fillColorSpace = new DeviceGrayCS();
this.fillColorSpaceObj = null;
this.strokeColorSpace = new DeviceGrayCS();
this.strokeColorSpaceObj = null;
this.fillColorObj = null;
this.strokeColorObj = null;
// Default fore and background colors
this.fillColor = '#000000';
this.strokeColor = '#000000';
// Note: fill alpha applies to all non-stroking operations
this.fillAlpha = 1;
this.strokeAlpha = 1;
this.lineWidth = 1;
this.paintFormXObjectDepth = 0;
this.old = old;
}
CanvasExtraState.prototype = {
clone: function CanvasExtraState_clone() {
return Object.create(this);
},
setCurrentPoint: function CanvasExtraState_setCurrentPoint(x, y) {
this.x = x;
this.y = y;
}
};
return CanvasExtraState;
})();
var CanvasGraphics = (function CanvasGraphicsClosure() {
// Defines the time the executeOperatorList is going to be executing
// before it stops and shedules a continue of execution.
var EXECUTION_TIME = 15;
function CanvasGraphics(canvasCtx, commonObjs, objs, textLayer, imageLayer) {
this.ctx = canvasCtx;
this.current = new CanvasExtraState();
this.stateStack = [];
this.pendingClip = null;
this.res = null;
this.xobjs = null;
this.commonObjs = commonObjs;
this.objs = objs;
this.textLayer = textLayer;
this.imageLayer = imageLayer;
this.groupStack = [];
if (canvasCtx) {
addContextCurrentTransform(canvasCtx);
}
}
function applyStencilMask(imgArray, width, height, inverseDecode, buffer) {
var imgArrayPos = 0;
var i, j, mask, buf;
// removing making non-masked pixels transparent
var bufferPos = 3; // alpha component offset
for (i = 0; i < height; i++) {
mask = 0;
for (j = 0; j < width; j++) {
if (!mask) {
buf = imgArray[imgArrayPos++];
mask = 128;
}
if (!(buf & mask) === inverseDecode) {
buffer[bufferPos] = 0;
}
bufferPos += 4;
mask >>= 1;
}
}
}
function putBinaryImageData(ctx, data, w, h) {
var tmpImgData = 'createImageData' in ctx ? ctx.createImageData(w, h) :
ctx.getImageData(0, 0, w, h);
var tmpImgDataPixels = tmpImgData.data;
if ('set' in tmpImgDataPixels)
tmpImgDataPixels.set(data);
else {
// Copy over the imageData pixel by pixel.
for (var i = 0, ii = tmpImgDataPixels.length; i < ii; i++)
tmpImgDataPixels[i] = data[i];
}
ctx.putImageData(tmpImgData, 0, 0);
}
function prescaleImage(pixels, width, height, widthScale, heightScale) {
pixels = new Uint8Array(pixels); // creating a copy
while (widthScale > 2 || heightScale > 2) {
if (heightScale > 2) {
// scaling image twice vertically
var rowSize = width * 4;
var k = 0, l = 0;
for (var i = 0; i < height - 1; i += 2) {
for (var j = 0; j < width; j++) {
var alpha1 = pixels[k + 3], alpha2 = pixels[k + 3 + rowSize];
if (alpha1 === alpha2) {
pixels[l] = (pixels[k] + pixels[k + rowSize]) >> 1;
pixels[l + 1] = (pixels[k + 1] + pixels[k + 1 + rowSize]) >> 1;
pixels[l + 2] = (pixels[k + 2] + pixels[k + 2 + rowSize]) >> 1;
pixels[l + 3] = alpha1;
} else if (alpha1 < alpha2) {
var d = 256 - alpha2 + alpha1;
pixels[l] = (pixels[k] * d + (pixels[k + rowSize] << 8)) >> 9;
pixels[l + 1] = (pixels[k + 1] * d +
(pixels[k + 1 + rowSize] << 8)) >> 9;
pixels[l + 2] = (pixels[k + 2] * d +
(pixels[k + 2 + rowSize] << 8)) >> 9;
pixels[l + 3] = alpha2;
} else {
var d = 256 - alpha1 + alpha2;
pixels[l] = ((pixels[k] << 8) + pixels[k + rowSize] * d) >> 9;
pixels[l + 1] = ((pixels[k + 1] << 8) +
pixels[k + 1 + rowSize] * d) >> 9;
pixels[l + 2] = ((pixels[k + 2] << 8) +
pixels[k + 2 + rowSize] * d) >> 9;
pixels[l + 3] = alpha1;
}
k += 4; l += 4;
}
k += rowSize;
}
if (height & 1) {
for (var i = 0; i < rowSize; i++) {
pixels[l++] = pixels[k++];
}
}
height = (height + 1) >> 1;
heightScale /= 2;
}
if (widthScale > 2) {
// scaling image twice horizontally
var k = 0, l = 0;
for (var i = 0; i < height; i++) {
for (var j = 0; j < width - 1; j += 2) {
var alpha1 = pixels[k + 3], alpha2 = pixels[k + 7];
if (alpha1 === alpha2) {
pixels[l] = (pixels[k] + pixels[k + 4]) >> 1;
pixels[l + 1] = (pixels[k + 1] + pixels[k + 5]) >> 1;
pixels[l + 2] = (pixels[k + 2] + pixels[k + 6]) >> 1;
pixels[l + 3] = alpha1;
} else if (alpha1 < alpha2) {
var d = 256 - alpha2 + alpha1;
pixels[l] = (pixels[k] * d + (pixels[k + 4] << 8)) >> 9;
pixels[l + 1] = (pixels[k + 1] * d + (pixels[k + 5] << 8)) >> 9;
pixels[l + 2] = (pixels[k + 2] * d + (pixels[k + 6] << 8)) >> 9;
pixels[l + 3] = alpha2;
} else {
var d = 256 - alpha1 + alpha2;
pixels[l] = ((pixels[k] << 8) + pixels[k + 4] * d) >> 9;
pixels[l + 1] = ((pixels[k + 1] << 8) + pixels[k + 5] * d) >> 9;
pixels[l + 2] = ((pixels[k + 2] << 8) + pixels[k + 6] * d) >> 9;
pixels[l + 3] = alpha1;
}
k += 8; l += 4;
}
if (width & 1) {
pixels[l++] = pixels[k++];
pixels[l++] = pixels[k++];
pixels[l++] = pixels[k++];
pixels[l++] = pixels[k++];
}
}
width = (width + 1) >> 1;
widthScale /= 2;
}
}
var tmpCanvas = createScratchCanvas(width, height);
var tmpCtx = tmpCanvas.getContext('2d');
putBinaryImageData(tmpCtx, pixels.subarray(0, width * height * 4),
width, height);
return tmpCanvas;
}
function copyCtxState(sourceCtx, destCtx) {
var properties = ['strokeStyle', 'fillStyle', 'fillRule', 'globalAlpha',
'lineWidth', 'lineCap', 'lineJoin', 'miterLimit',
'globalCompositeOperation', 'font'];
for (var i = 0, ii = properties.length; i < ii; i++) {
var property = properties[i];
if (property in sourceCtx) {
destCtx[property] = sourceCtx[property];
}
}
if ('setLineDash' in sourceCtx) {
destCtx.setLineDash(sourceCtx.getLineDash());
destCtx.lineDashOffset = sourceCtx.lineDashOffset;
} else if ('mozDash' in sourceCtx) {
destCtx.mozDash = sourceCtx.mozDash;
destCtx.mozDashOffset = sourceCtx.mozDashOffset;
}
}
var LINE_CAP_STYLES = ['butt', 'round', 'square'];
var LINE_JOIN_STYLES = ['miter', 'round', 'bevel'];
var NORMAL_CLIP = {};
var EO_CLIP = {};
CanvasGraphics.prototype = {
slowCommands: {
'stroke': true,
'closeStroke': true,
'fill': true,
'eoFill': true,
'fillStroke': true,
'eoFillStroke': true,
'closeFillStroke': true,
'closeEOFillStroke': true,
'showText': true,
'showSpacedText': true,
'setStrokeColorSpace': true,
'setFillColorSpace': true,
'setStrokeColor': true,
'setStrokeColorN': true,
'setFillColor': true,
'setFillColorN': true,
'setStrokeGray': true,
'setFillGray': true,
'setStrokeRGBColor': true,
'setFillRGBColor': true,
'setStrokeCMYKColor': true,
'setFillCMYKColor': true,
'paintJpegXObject': true,
'paintImageXObject': true,
'paintInlineImageXObject': true,
'paintInlineImageXObjectGroup': true,
'paintImageMaskXObject': true,
'paintImageMaskXObjectGroup': true,
'shadingFill': true
},
beginDrawing: function CanvasGraphics_beginDrawing(viewport, transparency) {
// For pdfs that use blend modes we have to clear the canvas else certain
// blend modes can look wrong since we'd be blending with a white
// backdrop. The problem with a transparent backdrop though is we then
// don't get sub pixel anti aliasing on text, so we fill with white if
// we can.
var width = this.ctx.canvas.width;
var height = this.ctx.canvas.height;
if (transparency) {
this.ctx.clearRect(0, 0, width, height);
} else {
this.ctx.mozOpaque = true;
this.ctx.save();
this.ctx.fillStyle = 'rgb(255, 255, 255)';
this.ctx.fillRect(0, 0, width, height);
this.ctx.restore();
}
var transform = viewport.transform;
this.ctx.save();
this.ctx.transform.apply(this.ctx, transform);
if (this.textLayer) {
this.textLayer.beginLayout();
}
if (this.imageLayer) {
this.imageLayer.beginLayout();
}
},
executeOperatorList: function CanvasGraphics_executeOperatorList(
operatorList,
executionStartIdx, continueCallback,
stepper) {
var argsArray = operatorList.argsArray;
var fnArray = operatorList.fnArray;
var i = executionStartIdx || 0;
var argsArrayLen = argsArray.length;
// Sometimes the OperatorList to execute is empty.
if (argsArrayLen == i) {
return i;
}
var executionEndIdx;
var endTime = Date.now() + EXECUTION_TIME;
var commonObjs = this.commonObjs;
var objs = this.objs;
var fnName;
var slowCommands = this.slowCommands;
while (true) {
if (stepper && i === stepper.nextBreakPoint) {
stepper.breakIt(i, continueCallback);
return i;
}
fnName = fnArray[i];
if (fnName !== 'dependency') {
this[fnName].apply(this, argsArray[i]);
} else {
var deps = argsArray[i];
for (var n = 0, nn = deps.length; n < nn; n++) {
var depObjId = deps[n];
var common = depObjId.substring(0, 2) == 'g_';
// If the promise isn't resolved yet, add the continueCallback
// to the promise and bail out.
if (!common && !objs.isResolved(depObjId)) {
objs.get(depObjId, continueCallback);
return i;
}
if (common && !commonObjs.isResolved(depObjId)) {
commonObjs.get(depObjId, continueCallback);
return i;
}
}
}
i++;
// If the entire operatorList was executed, stop as were done.
if (i == argsArrayLen) {
return i;
}
// If the execution took longer then a certain amount of time, shedule
// to continue exeution after a short delay.
// However, this is only possible if a 'continueCallback' is passed in.
if (continueCallback && slowCommands[fnName] && Date.now() > endTime) {
setTimeout(continueCallback, 0);
return i;
}
// If the operatorList isn't executed completely yet OR the execution
// 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;
case 'BM':
if (value && value.name && (value.name !== 'Normal')) {
var mode = value.name.replace(/([A-Z])/g,
function(c) {
return '-' + c.toLowerCase();
}
).substring(1);
this.ctx.globalCompositeOperation = mode;
if (this.ctx.globalCompositeOperation !== mode) {
warn('globalCompositeOperation "' + mode +
'" is not supported');
}
} else {
this.ctx.globalCompositeOperation = 'source-over';
}
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 = glyph.vmetric ? vmetric[1] : glyph.width * 0.5;
vx = -vx * 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;
var accent = glyph.accent;
var scaledX, scaledY, scaledAccentX, scaledAccentY;
if (!glyph.disabled) {
if (vertical) {
scaledX = vx / fontSizeScale;
scaledY = (x + vy) / fontSizeScale;
} else {
scaledX = x / fontSizeScale;
scaledY = 0;
}
if (accent) {
scaledAccentX = scaledX + accent.offset.x / fontSizeScale;
scaledAccentY = scaledY - accent.offset.y / fontSizeScale;
}
switch (textRenderingMode) {
default: // other unsupported rendering modes
case TextRenderingMode.FILL:
case TextRenderingMode.FILL_ADD_TO_PATH:
ctx.fillText(character, scaledX, scaledY);
if (accent) {
ctx.fillText(accent.fontChar, scaledAccentX, scaledAccentY);
}
break;
case TextRenderingMode.STROKE:
case TextRenderingMode.STROKE_ADD_TO_PATH:
ctx.strokeText(character, scaledX, scaledY);
if (accent) {
ctx.strokeText(accent.fontChar, scaledAccentX, scaledAccentY);
}
break;
case TextRenderingMode.FILL_STROKE:
case TextRenderingMode.FILL_STROKE_ADD_TO_PATH:
ctx.fillText(character, scaledX, scaledY);
ctx.strokeText(character, scaledX, scaledY);
if (accent) {
ctx.fillText(accent.fontChar, scaledAccentX, scaledAccentY);
ctx.strokeText(accent.fontChar, scaledAccentX, scaledAccentY);
}
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);
if (accent) {
clipCtx.fillText(accent.fontChar, scaledAccentX, scaledAccentY);
}
}
}
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;
// TJ array's number is independent from fontMatrix
var textHScale = current.textHScale * 0.001 * 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,
this.commonObjs);
} 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);
},
beginGroup: function CanvasGraphics_beginGroup(group) {
this.save();
var currentCtx = this.ctx;
// TODO non-isolated groups - according to Rik at adobe non-isolated
// group results aren't usually that different and they even have tools
// that ignore this setting. Notes from Rik on implmenting:
// - When you encounter an transparency group, create a new canvas with
// the dimensions of the bbox
// - copy the content from the previous canvas to the new canvas
// - draw as usual
// - remove the backdrop alpha:
// alphaNew = 1 - (1 - alpha)/(1 - alphaBackdrop) with 'alpha' the alpha
// value of your transparency group and 'alphaBackdrop' the alpha of the
// backdrop
// - remove background color:
// colorNew = color - alphaNew *colorBackdrop /(1 - alphaNew)
if (!group.isolated) {
TODO('Support non-isolated groups.');
}
// TODO knockout - supposedly possible with the clever use of compositing
// modes.
if (group.knockout) {
TODO('Support knockout groups.');
}
var currentTransform = currentCtx.mozCurrentTransform;
if (group.matrix) {
currentCtx.transform.apply(currentCtx, group.matrix);
}
assert(group.bbox, 'Bounding box is required.');
// Based on the current transform figure out how big the bounding box
// will actually be.
var bounds = Util.getAxialAlignedBoundingBox(
group.bbox,
currentCtx.mozCurrentTransform);
// Use ceil in case we're between sizes so we don't create canvas that is
// too small and make the canvas at least 1x1 pixels.
var drawnWidth = Math.max(Math.ceil(bounds[2] - bounds[0]), 1);
var drawnHeight = Math.max(Math.ceil(bounds[3] - bounds[1]), 1);
var scratchCanvas = createScratchCanvas(drawnWidth, drawnHeight);
var groupCtx = scratchCanvas.getContext('2d');
addContextCurrentTransform(groupCtx);
// Since we created a new canvas that is just the size of the bounding box
// we have to translate the group ctx.
var offsetX = bounds[0];
var offsetY = bounds[1];
groupCtx.translate(-offsetX, -offsetY);
groupCtx.transform.apply(groupCtx, currentTransform);
// Setup the current ctx so when the group is popped we draw it the right
// location.
currentCtx.setTransform(1, 0, 0, 1, 0, 0);
currentCtx.translate(offsetX, offsetY);
// The transparency group inherits all off the current graphics state
// except the blend mode, soft mask, and alpha constants.
copyCtxState(currentCtx, groupCtx);
this.ctx = groupCtx;
this.setGState([
['SMask', 'None'],
['BM', 'Normal'],
['ca', 1],
['CA', 1]
]);
this.groupStack.push(currentCtx);
},
endGroup: function CanvasGraphics_endGroup(group) {
var groupCtx = this.ctx;
this.ctx = this.groupStack.pop();
// Turn off image smoothing to avoid sub pixel interpolation which can
// look kind of blurry for some pdfs.
if ('imageSmoothingEnabled' in this.ctx) {
this.ctx.imageSmoothingEnabled = false;
} else {
this.ctx.mozImageSmoothingEnabled = false;
}
this.ctx.drawImage(groupCtx.canvas, 0, 0);
this.restore();
},
beginAnnotation: function CanvasGraphics_beginAnnotation(rect, transform,
matrix, border) {
this.save();
if (rect && isArray(rect) && 4 == rect.length) {
var width = rect[2] - rect[0];
var height = rect[3] - rect[1];
if (border) {
// TODO(mack): Support different border styles
this.save();
var rgb = border.rgb;
this.setStrokeRGBColor(rgb[0], rgb[1], rgb[2]);
this.setLineWidth(border.width);
this.rectangle(rect[0], rect[1], width, height);
this.stroke();
this.restore();
}
this.rectangle(rect[0], rect[1], width, height);
this.clip();
this.endPath();
}
this.transform.apply(this, transform);
this.transform.apply(this, matrix);
},
endAnnotation: function CanvasGraphics_endAnnotation() {
this.restore();
},
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;
})();