#123, part 1: create PartialEvaluator
This commit is contained in:
Chris Jones
parent
fb9b8b6417
commit
7974d8264b
266
pdf.js
266
pdf.js
@ -3385,18 +3385,13 @@ var Encodings = {
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var IDENTITY_MATRIX = [1, 0, 0, 1, 0, 0];
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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 CanvasExtraState = (function() {
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var EvalState = (function() {
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function constructor() {
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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.textMatrix = 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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@ -3413,34 +3408,13 @@ var CanvasExtraState = (function() {
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return constructor;
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})();
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function ScratchCanvas(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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var CanvasGraphics = (function() {
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function constructor(canvasCtx, imageCanvas) {
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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.ScratchCanvas = imageCanvas || ScratchCanvas;
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var PartialEvaluator = (function() {
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function constructor() {
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this.state = new EvalState();
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this.stateStack = [ ];
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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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// Used for tiling patterns
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var PAINT_TYPE_COLORED = 1, PAINT_TYPE_UNCOLORED = 2;
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constructor.prototype = {
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map: {
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var OP_MAP = {
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// Graphics state
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w: 'setLineWidth',
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J: 'setLineCap',
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@ -3533,6 +3507,88 @@ var CanvasGraphics = (function() {
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// Compatibility
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BX: 'beginCompat',
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EX: 'endCompat'
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};
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constructor.prototype = {
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eval: function(stream, xref, resources, fonts) {
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resources = xref.fetchIfRef(resources) || new Dict();
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var xobjs = xref.fetchIfRef(resources.get('XObject')) || new Dict();
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var parser = new Parser(new Lexer(stream), false);
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var objpool = [];
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function emitArg(arg) {
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if (typeof arg == 'object' || typeof arg == 'string') {
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var index = objpool.length;
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objpool[index] = arg;
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return 'objpool[' + index + ']';
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}
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return arg;
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}
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var src = '';
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var args = [];
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var obj;
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while (!IsEOF(obj = parser.getObj())) {
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if (IsCmd(obj)) {
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var cmd = obj.cmd;
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var fn = OP_MAP[cmd];
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assertWellFormed(fn, "Unknown command '" + cmd + "'");
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// TODO figure out how to type-check vararg functions
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if (cmd == 'Do' && !args[0].code) { // eagerly compile XForm objects
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var name = args[0].name;
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var xobj = xobjs.get(name);
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if (xobj) {
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xobj = xref.fetchIfRef(xobj);
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assertWellFormed(IsStream(xobj), 'XObject should be a stream');
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var type = xobj.dict.get('Subtype');
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assertWellFormed(
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IsName(type),
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'XObject should have a Name subtype'
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);
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if ('Form' == type.name) {
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args[0].code = this.eval(xobj,
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xref,
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xobj.dict.get('Resources'),
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fonts);
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}
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}
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} else if (cmd == 'Tf') { // eagerly collect all fonts
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var fontRes = resources.get('Font');
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if (fontRes) {
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fontRes = xref.fetchIfRef(fontRes);
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var font = xref.fetchIfRef(fontRes.get(args[0].name));
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assertWellFormed(IsDict(font));
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if (!font.translated) {
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font.translated = this.translateFont(font, xref, resources);
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if (fonts && font.translated) {
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// keep track of each font we translated so the caller can
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// load them asynchronously before calling display on a page
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fonts.push(font.translated);
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}
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}
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}
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}
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src += 'this.';
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src += fn;
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src += '(';
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src += args.map(emitArg).join(',');
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src += ');\n';
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args.length = 0;
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} else {
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assertWellFormed(args.length <= 33, 'Too many arguments');
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args.push(obj);
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}
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}
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var fn = Function('objpool', src);
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return function(gfx) { fn.call(gfx, objpool); };
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},
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translateFont: function(fontDict, xref, resources) {
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@ -3697,7 +3753,66 @@ var CanvasGraphics = (function() {
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properties: properties
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};
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},
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};
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return constructor;
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})();
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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 CanvasExtraState = (function() {
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function constructor() {
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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.textMatrix = 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.charSpace = 0;
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this.wordSpace = 0;
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this.textHScale = 100;
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// Color spaces
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this.fillColorSpace = null;
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this.strokeColorSpace = null;
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}
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constructor.prototype = {
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};
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return constructor;
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})();
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function ScratchCanvas(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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var CanvasGraphics = (function() {
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function constructor(canvasCtx, imageCanvas) {
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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.ScratchCanvas = imageCanvas || ScratchCanvas;
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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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// Used for tiling patterns
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var PAINT_TYPE_COLORED = 1, PAINT_TYPE_UNCOLORED = 2;
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constructor.prototype = {
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beginDrawing: function(mediaBox) {
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var cw = this.ctx.canvas.width, ch = this.ctx.canvas.height;
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this.ctx.save();
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@ -3705,6 +3820,11 @@ var CanvasGraphics = (function() {
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this.ctx.translate(0, -mediaBox.height);
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},
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compile: function(stream, xref, resources, fonts) {
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var pe = new PartialEvaluator();
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return pe.eval(stream, xref, resources, fonts);
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},
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execute: function(code, xref, resources) {
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resources = xref.fetchIfRef(resources) || new Dict();
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var savedXref = this.xref, savedRes = this.res, savedXobjs = this.xobjs;
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@ -3719,88 +3839,6 @@ var CanvasGraphics = (function() {
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this.xref = savedXref;
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},
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compile: function(stream, xref, resources, fonts) {
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resources = xref.fetchIfRef(resources) || new Dict();
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var xobjs = xref.fetchIfRef(resources.get('XObject')) || new Dict();
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var parser = new Parser(new Lexer(stream), false);
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var objpool = [];
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function emitArg(arg) {
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if (typeof arg == 'object' || typeof arg == 'string') {
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var index = objpool.length;
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objpool[index] = arg;
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return 'objpool[' + index + ']';
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}
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return arg;
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}
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var src = '';
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var args = [];
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var map = this.map;
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var obj;
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while (!IsEOF(obj = parser.getObj())) {
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if (IsCmd(obj)) {
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var cmd = obj.cmd;
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var fn = map[cmd];
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assertWellFormed(fn, "Unknown command '" + cmd + "'");
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// TODO figure out how to type-check vararg functions
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if (cmd == 'Do' && !args[0].code) { // eagerly compile XForm objects
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var name = args[0].name;
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var xobj = xobjs.get(name);
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if (xobj) {
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xobj = xref.fetchIfRef(xobj);
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assertWellFormed(IsStream(xobj), 'XObject should be a stream');
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var type = xobj.dict.get('Subtype');
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assertWellFormed(
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IsName(type),
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'XObject should have a Name subtype'
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);
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if ('Form' == type.name) {
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args[0].code = this.compile(xobj,
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xref,
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xobj.dict.get('Resources'),
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fonts);
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}
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}
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} else if (cmd == 'Tf') { // eagerly collect all fonts
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var fontRes = resources.get('Font');
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if (fontRes) {
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fontRes = xref.fetchIfRef(fontRes);
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var font = xref.fetchIfRef(fontRes.get(args[0].name));
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assertWellFormed(IsDict(font));
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if (!font.translated) {
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font.translated = this.translateFont(font, xref, resources);
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if (fonts && font.translated) {
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// keep track of each font we translated so the caller can
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// load them asynchronously before calling display on a page
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fonts.push(font.translated);
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}
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}
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}
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}
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src += 'this.';
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src += fn;
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src += '(';
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src += args.map(emitArg).join(',');
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src += ');\n';
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args.length = 0;
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} else {
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assertWellFormed(args.length <= 33, 'Too many arguments');
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args.push(obj);
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}
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}
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var fn = Function('objpool', src);
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return function(gfx) { fn.call(gfx, objpool); };
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},
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endDrawing: function() {
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this.ctx.restore();
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},
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