Merge pull request #265 from sbarman/patternfix
Fix to gradient and tiling colorspaces
This commit is contained in:
Chris Jones
commit
736f2e9ea1
747
pdf.js
747
pdf.js
@ -3851,7 +3851,7 @@ var PartialEvaluator = (function() {
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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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function constructor(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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@ -3868,10 +3868,18 @@ var CanvasExtraState = (function() {
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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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this.fillColorSpaceObj = null;
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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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this.old = old;
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}
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constructor.prototype = {
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clone: function canvasextra_clone() {
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return Object.create(this);
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}
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};
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return constructor;
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})();
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@ -3902,9 +3910,6 @@ var CanvasGraphics = (function() {
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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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@ -3967,8 +3972,9 @@ var CanvasGraphics = (function() {
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if (this.ctx.$saveCurrentX) {
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this.ctx.$saveCurrentX();
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}
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this.stateStack.push(this.current);
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this.current = new CanvasExtraState();
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var old = this.current;
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this.stateStack.push(old);
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this.current = old.clone();
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},
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restore: function() {
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var prev = this.stateStack.pop();
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@ -4007,7 +4013,19 @@ var CanvasGraphics = (function() {
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this.ctx.rect(x, y, width, height);
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},
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stroke: function() {
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this.ctx.stroke();
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var ctx = this.ctx;
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var strokeColor = this.current.strokeColor;
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if (strokeColor && strokeColor.type === "Pattern") {
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// for patterns, we transform to pattern space, calculate
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// the pattern, call stroke, and restore to user space
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ctx.save();
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ctx.strokeStyle = strokeColor.getPattern(ctx);
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ctx.stroke();
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ctx.restore();
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} else {
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ctx.stroke();
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}
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this.consumePath();
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},
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closeStroke: function() {
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@ -4015,7 +4033,18 @@ var CanvasGraphics = (function() {
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this.stroke();
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},
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fill: function() {
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this.ctx.fill();
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var ctx = this.ctx;
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var fillColor = this.current.fillColor;
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if (fillColor && fillColor.type === "Pattern") {
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ctx.save();
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ctx.fillStyle = fillColor.getPattern(ctx);
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ctx.fill();
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ctx.restore();
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} else {
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ctx.fill();
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}
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this.consumePath();
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},
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eoFill: function() {
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@ -4024,8 +4053,28 @@ var CanvasGraphics = (function() {
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this.restoreFillRule(savedFillRule);
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},
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fillStroke: function() {
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this.ctx.fill();
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this.ctx.stroke();
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var ctx = this.ctx;
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var fillColor = this.current.fillColor;
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if (fillColor && fillColor.type === "Pattern") {
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ctx.save();
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ctx.fillStyle = fillColor.getPattern(ctx);
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ctx.fill();
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ctx.restore();
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} else {
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ctx.fill();
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}
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var strokeColor = this.current.strokeColor;
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if (strokeColor && strokeColor.type === "Pattern") {
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ctx.save();
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ctx.strokeStyle = strokeColor.getPattern(ctx);
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ctx.stroke();
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ctx.restore();
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} else {
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ctx.stroke();
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}
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this.consumePath();
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},
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eoFillStroke: function() {
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@ -4208,168 +4257,41 @@ var CanvasGraphics = (function() {
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ColorSpace.parse(space, this.xref, this.res);
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},
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setStrokeColor: function(/*...*/) {
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var cs = this.getStrokeColorSpace();
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var cs = this.current.strokeColorSpace;
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var color = cs.getRgb(arguments);
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this.setStrokeRGBColor.apply(this, color);
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},
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setStrokeColorN: function(/*...*/) {
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var cs = this.getStrokeColorSpace();
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var cs = this.current.strokeColorSpace;
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if (cs.name == 'Pattern') {
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this.ctx.strokeStyle = this.getPattern(cs, arguments);
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// wait until fill to actually get the pattern, since Canvas
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// calcualtes the pattern according to the current coordinate space,
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// not the space when the pattern is set.
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var pattern = Pattern.parse(arguments, cs, this.xref, this.res,
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this.ctx);
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this.current.strokeColor = pattern;
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} else {
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this.setStrokeColor.apply(this, arguments);
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}
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},
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setFillColor: function(/*...*/) {
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var cs = this.getFillColorSpace();
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var cs = this.current.fillColorSpace;
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var color = cs.getRgb(arguments);
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this.setFillRGBColor.apply(this, color);
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},
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setFillColorN: function(/*...*/) {
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var cs = this.getFillColorSpace();
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var cs = this.current.fillColorSpace;
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if (cs.name == 'Pattern') {
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this.ctx.fillStyle = this.getPattern(cs, arguments);
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// wait until fill to actually get the pattern
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var pattern = Pattern.parse(arguments, cs, this.xref, this.res,
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this.ctx);
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this.current.fillColor = pattern;
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} else {
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this.setFillColor.apply(this, arguments);
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}
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},
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getPattern: function(cs, args) {
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var length = args.length;
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var base = cs.base;
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if (base) {
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var baseComps = base.numComps;
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var color = [];
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for (var i = 0; i < baseComps; ++i)
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color.push(args[i]);
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color = base.getRgb(color);
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}
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var patternName = args[length - 1];
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if (!IsName(patternName))
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error("Bad args to getPattern");
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var xref = this.xref;
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var patternRes = xref.fetchIfRef(this.res.get("Pattern"));
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if (!patternRes)
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error("Unable to find pattern resource");
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var pattern = xref.fetchIfRef(patternRes.get(patternName.name));
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var dict = IsStream(pattern) ? pattern.dict : pattern;
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var types = [null, this.getTilingPattern, this.getShadingPattern];
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var typeNum = dict.get("PatternType");
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var patternFn = types[typeNum];
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if (!patternFn)
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error("Unhandled pattern type");
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return patternFn.call(this, pattern, dict, color);
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},
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getShadingPattern: function(pattern, dict) {
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var matrix = dict.get("Matrix");
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this.save();
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this.transform.apply(this, matrix);
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var shading = this.getShading(pattern.get("Shading"));
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this.restore();
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TODO('store transform so it can be applied before every fill');
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return shading;
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},
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getTilingPattern: function(pattern, dict, color) {
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function multiply(m, tm) {
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var a = m[0] * tm[0] + m[1] * tm[2];
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var b = m[0] * tm[1] + m[1] * tm[3];
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var c = m[2] * tm[0] + m[3] * tm[2];
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var d = m[2] * tm[1] + m[3] * tm[3];
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var e = m[4] * tm[0] + m[5] * tm[2] + tm[4];
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var f = m[4] * tm[1] + m[5] * tm[3] + tm[5];
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return [a, b, c, d, e, f];
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};
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this.save();
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var ctx = this.ctx;
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TODO('TilingType');
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var matrix = dict.get('Matrix') || IDENTITY_MATRIX;
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var bbox = dict.get('BBox');
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var x0 = bbox[0], y0 = bbox[1], x1 = bbox[2], y1 = bbox[3];
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var xstep = dict.get('XStep');
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var ystep = dict.get('YStep');
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// top left corner should correspond to the top left of the bbox
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var topLeft = this.applyTransform(x0, y0, matrix);
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// we want the canvas to be as large as the step size
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var botRight = this.applyTransform(x0 + xstep, y0 + ystep, matrix);
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var width = botRight[0] - topLeft[0];
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var height = botRight[1] - topLeft[1];
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// TODO: hack to avoid OOM, remove then pattern code is fixed
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if (Math.abs(width) > 8192 || Math.abs(height) > 8192) {
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this.restore();
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return 'hotpink';
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}
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var tmpCanvas = new this.ScratchCanvas(width, height);
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// set the new canvas element context as the graphics context
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var tmpCtx = tmpCanvas.getContext('2d');
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var savedCtx = ctx;
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this.ctx = tmpCtx;
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var paintType = dict.get('PaintType');
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switch (paintType) {
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case PAINT_TYPE_COLORED:
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tmpCtx.fillStyle = savedCtx.fillStyle;
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tmpCtx.strokeStyle = savedCtx.strokeStyle;
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break;
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case PAINT_TYPE_UNCOLORED:
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color = this.makeCssRgb.apply(this, color);
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tmpCtx.fillStyle = color;
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tmpCtx.strokeStyle = color;
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break;
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default:
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error('Unsupported paint type');
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}
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// normalize transform matrix so each step
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// takes up the entire tmpCanvas (need to remove white borders)
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if (matrix[1] === 0 && matrix[2] === 0) {
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matrix[0] = tmpCanvas.width / xstep;
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matrix[3] = tmpCanvas.height / ystep;
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topLeft = this.applyTransform(x0, y0, matrix);
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}
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// move the top left corner of bounding box to [0,0]
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matrix = multiply(matrix, [1, 0, 0, 1, -topLeft[0], -topLeft[1]]);
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this.transform.apply(this, matrix);
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if (bbox && IsArray(bbox) && 4 == bbox.length) {
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this.rectangle.apply(this, bbox);
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this.clip();
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this.endPath();
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}
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var xref = this.xref;
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var res = xref.fetchIfRef(dict.get('Resources'));
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if (!pattern.code)
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pattern.code = this.compile(pattern, xref, res, []);
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this.execute(pattern.code, xref, res);
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this.ctx = savedCtx;
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this.restore();
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return this.ctx.createPattern(tmpCanvas, 'repeat');
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},
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setStrokeGray: function(gray) {
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this.setStrokeRGBColor(gray, gray, gray);
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},
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@ -4377,16 +4299,24 @@ var CanvasGraphics = (function() {
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this.setFillRGBColor(gray, gray, gray);
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},
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setStrokeRGBColor: function(r, g, b) {
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this.ctx.strokeStyle = this.makeCssRgb(r, g, b);
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var color = Util.makeCssRgb(r, g, b);
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this.ctx.strokeStyle = color;
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this.current.strokeColor = color;
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},
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setFillRGBColor: function(r, g, b) {
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this.ctx.fillStyle = this.makeCssRgb(r, g, b);
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var color = Util.makeCssRgb(r, g, b);
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this.ctx.fillStyle = color;
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this.current.fillColor = color;
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},
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setStrokeCMYKColor: function(c, m, y, k) {
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this.ctx.strokeStyle = this.makeCssCmyk(c, m, y, k);
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var color = Util.makeCssCmyk(c, m, y, k);
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this.ctx.strokeStyle = color;
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this.current.strokeColor = color;
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},
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setFillCMYKColor: function(c, m, y, k) {
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this.ctx.fillStyle = this.makeCssCmyk(c, m, y, k);
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var color = Util.makeCssCmyk(c, m, y, k);
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this.ctx.fillStyle = color;
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this.current.fillColor = color;
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},
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// Shading
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@ -4403,10 +4333,10 @@ var CanvasGraphics = (function() {
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if (!shading)
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error('No shading object found');
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var shadingFill = this.getShading(shading);
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var shadingFill = Pattern.parseShading(shading, null, xref, res, ctx);
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this.save();
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ctx.fillStyle = shadingFill;
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ctx.fillStyle = shadingFill.getPattern();
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var inv = ctx.mozCurrentTransformInverse;
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if (inv) {
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@ -4414,10 +4344,10 @@ var CanvasGraphics = (function() {
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var width = canvas.width;
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var height = canvas.height;
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var bl = this.applyTransform(0, 0, inv);
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var br = this.applyTransform(0, width, inv);
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var ul = this.applyTransform(height, 0, inv);
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var ur = this.applyTransform(height, width, inv);
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var bl = Util.applyTransform([0, 0], inv);
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var br = Util.applyTransform([0, width], inv);
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var ul = Util.applyTransform([height, 0], inv);
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var ur = Util.applyTransform([height, width], inv);
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var x0 = Math.min(bl[0], br[0], ul[0], ur[0]);
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var y0 = Math.min(bl[1], br[1], ul[1], ur[1]);
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@ -4437,129 +4367,6 @@ var CanvasGraphics = (function() {
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this.restore();
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},
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getShading: function(shading) {
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this.save();
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shading = this.xref.fetchIfRef(shading);
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var dict = IsStream(shading) ? shading.dict : shading;
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var bbox = dict.get('BBox');
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if (bbox && IsArray(bbox) && 4 == bbox.length) {
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this.rectangle.apply(this, bbox);
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this.clip();
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this.endPath();
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}
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var background = dict.get('Background');
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if (background)
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TODO('handle background colors');
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var cs = dict.get('ColorSpace', 'CS');
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cs = ColorSpace.parse(cs, this.xref, this.res);
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var types = [null,
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null,
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this.getAxialShading,
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this.getRadialShading];
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var typeNum = dict.get('ShadingType');
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var shadingFn = types[typeNum];
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this.restore();
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// Most likely we will not implement other types of shading
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// unless the browser supports them
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if (!shadingFn) {
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warn("Unknown or NYI type of shading '"+ typeNum +"'");
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return 'hotpink';
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}
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return shadingFn.call(this, shading, cs);
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},
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getAxialShading: function(sh, cs) {
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var coordsArr = sh.get('Coords');
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var x0 = coordsArr[0], y0 = coordsArr[1],
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x1 = coordsArr[2], y1 = coordsArr[3];
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var t0 = 0.0, t1 = 1.0;
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if (sh.has('Domain')) {
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var domainArr = sh.get('Domain');
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t0 = domainArr[0], t1 = domainArr[1];
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}
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var extendStart = false, extendEnd = false;
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if (sh.has('Extend')) {
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var extendArr = sh.get('Extend');
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extendStart = extendArr[0], extendEnd = extendArr[1];
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TODO('Support extend');
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}
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var fnObj = sh.get('Function');
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fnObj = this.xref.fetchIfRef(fnObj);
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if (IsArray(fnObj))
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error('No support for array of functions');
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else if (!IsPDFFunction(fnObj))
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error('Invalid function');
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var fn = new PDFFunction(this.xref, fnObj);
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var gradient = this.ctx.createLinearGradient(x0, y0, x1, y1);
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// 10 samples seems good enough for now, but probably won't work
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// if there are sharp color changes. Ideally, we would implement
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// the spec faithfully and add lossless optimizations.
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var step = (t1 - t0) / 10;
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var diff = t1 - t0;
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for (var i = t0; i <= t1; i += step) {
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var color = fn.func([i]);
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var rgbColor = cs.getRgb(color);
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gradient.addColorStop((i - t0) / diff,
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this.makeCssRgb.apply(this, rgbColor));
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}
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return gradient;
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},
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getRadialShading: function(sh, cs) {
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var coordsArr = sh.get('Coords');
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var x0 = coordsArr[0], y0 = coordsArr[1], r0 = coordsArr[2];
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var x1 = coordsArr[3], y1 = coordsArr[4], r1 = coordsArr[5];
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var t0 = 0.0, t1 = 1.0;
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if (sh.has('Domain')) {
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var domainArr = sh.get('Domain');
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t0 = domainArr[0], t1 = domainArr[1];
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}
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var extendStart = false, extendEnd = false;
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if (sh.has('Extend')) {
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var extendArr = sh.get('Extend');
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extendStart = extendArr[0], extendEnd = extendArr[1];
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TODO('Support extend');
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}
|
||||
var fnObj = sh.get('Function');
|
||||
fnObj = this.xref.fetchIfRef(fnObj);
|
||||
if (IsArray(fnObj))
|
||||
error('No support for array of functions');
|
||||
else if (!IsPDFFunction(fnObj))
|
||||
error('Invalid function');
|
||||
var fn = new PDFFunction(this.xref, fnObj);
|
||||
|
||||
var gradient =
|
||||
this.ctx.createRadialGradient(x0, y0, r0, x1, y1, r1);
|
||||
|
||||
// 10 samples seems good enough for now, but probably won't work
|
||||
// if there are sharp color changes. Ideally, we would implement
|
||||
// the spec faithfully and add lossless optimizations.
|
||||
var step = (t1 - t0) / 10;
|
||||
var diff = t1 - t0;
|
||||
|
||||
for (var i = t0; i <= t1; i += step) {
|
||||
var color = fn.func([i]);
|
||||
var rgbColor = cs.getRgb(color);
|
||||
gradient.addColorStop((i - t0) / diff,
|
||||
this.makeCssRgb.apply(this, rgbColor));
|
||||
}
|
||||
return gradient;
|
||||
},
|
||||
|
||||
// Images
|
||||
beginInlineImage: function() {
|
||||
@ -4698,48 +4505,6 @@ var CanvasGraphics = (function() {
|
||||
}
|
||||
this.ctx.beginPath();
|
||||
},
|
||||
makeCssRgb: function(r, g, b) {
|
||||
var ri = (255 * r) | 0, gi = (255 * g) | 0, bi = (255 * b) | 0;
|
||||
return 'rgb(' + ri + ',' + gi + ',' + bi + ')';
|
||||
},
|
||||
makeCssCmyk: function(c, m, y, k) {
|
||||
// while waiting on CSS's cmyk()...
|
||||
// http://www.ilkeratalay.com/colorspacesfaq.php#rgb
|
||||
var ri = (255 * (1 - Math.min(1, c * (1 - k) + k))) | 0;
|
||||
var gi = (255 * (1 - Math.min(1, m * (1 - k) + k))) | 0;
|
||||
var bi = (255 * (1 - Math.min(1, y * (1 - k) + k))) | 0;
|
||||
return 'rgb(' + ri + ',' + gi + ',' + bi + ')';
|
||||
},
|
||||
getFillColorSpace: function() {
|
||||
var cs = this.current.fillColorSpace;
|
||||
if (cs)
|
||||
return cs;
|
||||
|
||||
var states = this.stateStack;
|
||||
var i = states.length - 1;
|
||||
while (i >= 0 && !(cs = states[i].fillColorSpace))
|
||||
--i;
|
||||
|
||||
if (cs)
|
||||
return cs;
|
||||
else
|
||||
return new DeviceRgbCS();
|
||||
},
|
||||
getStrokeColorSpace: function() {
|
||||
var cs = this.current.strokeColorSpace;
|
||||
if (cs)
|
||||
return cs;
|
||||
|
||||
var states = this.stateStack;
|
||||
var i = states.length - 1;
|
||||
while (i >= 0 && !(cs = states[i].strokeColorSpace))
|
||||
--i;
|
||||
|
||||
if (cs)
|
||||
return cs;
|
||||
else
|
||||
return new DeviceRgbCS();
|
||||
},
|
||||
// We generally keep the canvas context set for
|
||||
// nonzero-winding, and just set evenodd for the operations
|
||||
// that need them.
|
||||
@ -4751,11 +4516,26 @@ var CanvasGraphics = (function() {
|
||||
restoreFillRule: function(rule) {
|
||||
this.ctx.mozFillRule = rule;
|
||||
},
|
||||
applyTransform: function(x0, y0, m) {
|
||||
var xt = x0 * m[0] + y0 * m[2] + m[4];
|
||||
var yt = x0 * m[1] + y0 * m[3] + m[5];
|
||||
return [xt, yt];
|
||||
}
|
||||
};
|
||||
|
||||
return constructor;
|
||||
})();
|
||||
|
||||
var Util = (function() {
|
||||
function constructor() {};
|
||||
constructor.makeCssRgb = function makergb(r, g, b) {
|
||||
var ri = (255 * r) | 0, gi = (255 * g) | 0, bi = (255 * b) | 0;
|
||||
return 'rgb(' + ri + ',' + gi + ',' + bi + ')';
|
||||
};
|
||||
constructor.makeCssCmyk = function makecmyk(c, m, y, k) {
|
||||
var c = (new DeviceCmykCS()).getRgb([c, m, y, k]);
|
||||
var ri = (255 * c[0]) | 0, gi = (255 * c[1]) | 0, bi = (255 * c[2]) | 0;
|
||||
return 'rgb(' + ri + ',' + gi + ',' + bi + ')';
|
||||
};
|
||||
constructor.applyTransform = function apply(p, m) {
|
||||
var xt = p[0] * m[0] + p[1] * m[2] + m[4];
|
||||
var yt = p[0] * m[1] + p[1] * m[3] + m[5];
|
||||
return [xt, yt];
|
||||
};
|
||||
|
||||
return constructor;
|
||||
@ -5112,6 +4892,307 @@ var DeviceCmykCS = (function() {
|
||||
return constructor;
|
||||
})();
|
||||
|
||||
var Pattern = (function() {
|
||||
// Constructor should define this.getPattern
|
||||
function constructor() {
|
||||
error('should not call Pattern constructor');
|
||||
};
|
||||
|
||||
constructor.prototype = {
|
||||
// Input: current Canvas context
|
||||
// Output: the appropriate fillStyle or strokeStyle
|
||||
getPattern: function pattern_getStyle(ctx) {
|
||||
error('Should not call Pattern.getStyle');
|
||||
},
|
||||
};
|
||||
|
||||
constructor.parse = function pattern_parse(args, cs, xref, res, ctx) {
|
||||
var length = args.length;
|
||||
|
||||
var patternName = args[length - 1];
|
||||
if (!IsName(patternName))
|
||||
error("Bad args to getPattern");
|
||||
|
||||
var patternRes = xref.fetchIfRef(res.get("Pattern"));
|
||||
if (!patternRes)
|
||||
error("Unable to find pattern resource");
|
||||
|
||||
var pattern = xref.fetchIfRef(patternRes.get(patternName.name));
|
||||
var dict = IsStream(pattern) ? pattern.dict : pattern;
|
||||
var typeNum = dict.get("PatternType");
|
||||
|
||||
switch(typeNum) {
|
||||
case 1:
|
||||
var base = cs.base;
|
||||
var color;
|
||||
if (base) {
|
||||
var baseComps = base.numComps;
|
||||
|
||||
color = [];
|
||||
for (var i = 0; i < baseComps; ++i)
|
||||
color.push(args[i]);
|
||||
|
||||
color = base.getRgb(color);
|
||||
}
|
||||
return new TilingPattern(pattern, dict, color, xref, ctx);
|
||||
case 2:
|
||||
var shading = xref.fetchIfRef(dict.get('Shading'));
|
||||
var matrix = dict.get('Matrix');
|
||||
return Pattern.parseShading(shading, matrix, xref, res, ctx);
|
||||
default:
|
||||
error('Unknown type of pattern');
|
||||
}
|
||||
};
|
||||
|
||||
constructor.parseShading = function pattern_shading(shading, matrix,
|
||||
xref, res, ctx) {
|
||||
|
||||
var dict = IsStream(shading) ? shading.dict : shading;
|
||||
var type = dict.get('ShadingType');
|
||||
|
||||
switch (type) {
|
||||
case 2:
|
||||
case 3:
|
||||
// both radial and axial shadings are handled by RadialAxial shading
|
||||
return new RadialAxialShading(dict, matrix, xref, res, ctx);
|
||||
default:
|
||||
return new DummyShading();
|
||||
}
|
||||
}
|
||||
return constructor;
|
||||
})();
|
||||
|
||||
var DummyShading = (function() {
|
||||
function constructor() {
|
||||
this.type = 'Pattern';
|
||||
};
|
||||
constructor.prototype = {
|
||||
getPattern: function dummy_getpattern() {
|
||||
return 'hotpink';
|
||||
}
|
||||
};
|
||||
return constructor;
|
||||
})();
|
||||
|
||||
// Radial and axial shading have very similar implementations
|
||||
// If needed, the implementations can be broken into two classes
|
||||
var RadialAxialShading = (function() {
|
||||
function constructor(dict, matrix, xref, res, ctx) {
|
||||
this.matrix = matrix;
|
||||
var bbox = dict.get('BBox');
|
||||
var background = dict.get('Background');
|
||||
this.coordsArr = dict.get('Coords');
|
||||
this.shadingType = dict.get('ShadingType');
|
||||
this.type = 'Pattern';
|
||||
|
||||
this.ctx = ctx;
|
||||
this.curMatrix = ctx.mozCurrentTransform;
|
||||
|
||||
var cs = dict.get('ColorSpace', 'CS');
|
||||
cs = ColorSpace.parse(cs, xref, res);
|
||||
this.cs = cs;
|
||||
|
||||
var t0 = 0.0, t1 = 1.0;
|
||||
if (dict.has('Domain')) {
|
||||
var domainArr = dict.get('Domain');
|
||||
t0 = domainArr[0], t1 = domainArr[1];
|
||||
}
|
||||
|
||||
var extendStart = false, extendEnd = false;
|
||||
if (dict.has('Extend')) {
|
||||
var extendArr = dict.get('Extend');
|
||||
extendStart = extendArr[0], extendEnd = extendArr[1];
|
||||
TODO('Support extend');
|
||||
}
|
||||
|
||||
this.extendStart = extendStart;
|
||||
this.extendEnd = extendEnd;
|
||||
|
||||
var fnObj = dict.get('Function');
|
||||
fnObj = xref.fetchIfRef(fnObj);
|
||||
if (IsArray(fnObj))
|
||||
error('No support for array of functions');
|
||||
else if (!IsPDFFunction(fnObj))
|
||||
error('Invalid function');
|
||||
var fn = new PDFFunction(xref, fnObj);
|
||||
|
||||
// 10 samples seems good enough for now, but probably won't work
|
||||
// if there are sharp color changes. Ideally, we would implement
|
||||
// the spec faithfully and add lossless optimizations.
|
||||
var step = (t1 - t0) / 10;
|
||||
var diff = t1 - t0;
|
||||
|
||||
var colorStops = [];
|
||||
for (var i = t0; i <= t1; i += step) {
|
||||
var color = fn.func([i]);
|
||||
var rgbColor = Util.makeCssRgb.apply(this, cs.getRgb(color));
|
||||
colorStops.push([(i - t0) / diff, rgbColor]);
|
||||
}
|
||||
|
||||
this.colorStops = colorStops;
|
||||
};
|
||||
|
||||
constructor.prototype = {
|
||||
getPattern: function() {
|
||||
var coordsArr = this.coordsArr;
|
||||
var type = this.shadingType;
|
||||
if (type == 2) {
|
||||
var p0 = [coordsArr[0], coordsArr[1]];
|
||||
var p1 = [coordsArr[2], coordsArr[3]];
|
||||
} else if (type == 3) {
|
||||
var p0 = [coordsArr[0], coordsArr[1]];
|
||||
var p1 = [coordsArr[3], coordsArr[4]];
|
||||
var r0 = coordsArr[2], r1 = coordsArr[5]
|
||||
} else {
|
||||
error()
|
||||
}
|
||||
|
||||
var matrix = this.matrix;
|
||||
if (matrix) {
|
||||
p0 = Util.applyTransform(p0, matrix);
|
||||
p1 = Util.applyTransform(p1, matrix);
|
||||
}
|
||||
|
||||
// if the browser supports getting the tranform matrix, convert
|
||||
// gradient coordinates from pattern space to current user space
|
||||
var curMatrix = this.curMatrix;
|
||||
var ctx = this.ctx;
|
||||
if (curMatrix) {
|
||||
var userMatrix = ctx.mozCurrentTransformInverse;
|
||||
|
||||
p0 = Util.applyTransform(p0, curMatrix);
|
||||
p0 = Util.applyTransform(p0, userMatrix);
|
||||
|
||||
p1 = Util.applyTransform(p1, curMatrix);
|
||||
p1 = Util.applyTransform(p1, userMatrix);
|
||||
}
|
||||
|
||||
var colorStops = this.colorStops;
|
||||
if (type == 2)
|
||||
var grad = ctx.createLinearGradient(p0[0], p0[1], p1[0], p1[1]);
|
||||
else if (type == 3)
|
||||
var grad = ctx.createRadialGradient(p0[0], p0[1], r0, p1[0], p1[1], r1);
|
||||
|
||||
for (var i = 0, ii = colorStops.length; i < ii; ++i) {
|
||||
var c = colorStops[i];
|
||||
grad.addColorStop(c[0], c[1]);
|
||||
}
|
||||
return grad;
|
||||
}
|
||||
};
|
||||
return constructor;
|
||||
})();
|
||||
|
||||
var TilingPattern = (function() {
|
||||
var PAINT_TYPE_COLORED = 1, PAINT_TYPE_UNCOLORED = 2;
|
||||
|
||||
function constructor(pattern, dict, color, xref, ctx) {
|
||||
function multiply(m, tm) {
|
||||
var a = m[0] * tm[0] + m[1] * tm[2];
|
||||
var b = m[0] * tm[1] + m[1] * tm[3];
|
||||
var c = m[2] * tm[0] + m[3] * tm[2];
|
||||
var d = m[2] * tm[1] + m[3] * tm[3];
|
||||
var e = m[4] * tm[0] + m[5] * tm[2] + tm[4];
|
||||
var f = m[4] * tm[1] + m[5] * tm[3] + tm[5];
|
||||
return [a, b, c, d, e, f];
|
||||
};
|
||||
|
||||
TODO('TilingType');
|
||||
|
||||
this.matrix = dict.get("Matrix");
|
||||
this.curMatrix = ctx.mozCurrentTransform;
|
||||
this.invMatrix = ctx.mozCurrentTransformInverse;
|
||||
this.ctx = ctx;
|
||||
this.type = 'Pattern';
|
||||
|
||||
var bbox = dict.get('BBox');
|
||||
var x0 = bbox[0], y0 = bbox[1], x1 = bbox[2], y1 = bbox[3];
|
||||
|
||||
var xstep = dict.get('XStep');
|
||||
var ystep = dict.get('YStep');
|
||||
|
||||
var topLeft = [x0, y0];
|
||||
// we want the canvas to be as large as the step size
|
||||
var botRight = [x0 + xstep, y0 + ystep]
|
||||
|
||||
var width = botRight[0] - topLeft[0];
|
||||
var height = botRight[1] - topLeft[1];
|
||||
|
||||
// TODO: hack to avoid OOM, we would idealy compute the tiling
|
||||
// pattern to be only as large as the acual size in device space
|
||||
// This could be computed with .mozCurrentTransform, but still
|
||||
// needs to be implemented
|
||||
while (Math.abs(width) > 512 || Math.abs(height) > 512) {
|
||||
width = 512;
|
||||
height = 512;
|
||||
}
|
||||
|
||||
var tmpCanvas = new ScratchCanvas(width, height);
|
||||
|
||||
// set the new canvas element context as the graphics context
|
||||
var tmpCtx = tmpCanvas.getContext('2d');
|
||||
var graphics = new CanvasGraphics(tmpCtx);
|
||||
|
||||
var paintType = dict.get('PaintType');
|
||||
switch (paintType) {
|
||||
case PAINT_TYPE_COLORED:
|
||||
tmpCtx.fillStyle = ctx.fillStyle;
|
||||
tmpCtx.strokeStyle = ctx.strokeStyle;
|
||||
break;
|
||||
case PAINT_TYPE_UNCOLORED:
|
||||
color = Util.makeCssRgb.apply(this, color);
|
||||
tmpCtx.fillStyle = color;
|
||||
tmpCtx.strokeStyle = color;
|
||||
break;
|
||||
default:
|
||||
error('Unsupported paint type');
|
||||
}
|
||||
|
||||
var scale = [width / xstep, height / ystep];
|
||||
this.scale = scale;
|
||||
|
||||
// transform coordinates to pattern space
|
||||
var tmpTranslate = [1, 0, 0, 1, -topLeft[0], -topLeft[1]];
|
||||
var tmpScale = [scale[0], 0, 0, scale[1], 0, 0];
|
||||
graphics.transform.apply(graphics, tmpScale);
|
||||
graphics.transform.apply(graphics, tmpTranslate);
|
||||
|
||||
if (bbox && IsArray(bbox) && 4 == bbox.length) {
|
||||
graphics.rectangle.apply(graphics, bbox);
|
||||
graphics.clip();
|
||||
graphics.endPath();
|
||||
}
|
||||
|
||||
var res = xref.fetchIfRef(dict.get('Resources'));
|
||||
if (!pattern.code)
|
||||
pattern.code = graphics.compile(pattern, xref, res, []);
|
||||
graphics.execute(pattern.code, xref, res);
|
||||
|
||||
this.canvas = tmpCanvas;
|
||||
};
|
||||
|
||||
constructor.prototype = {
|
||||
getPattern: function tiling_getPattern() {
|
||||
var matrix = this.matrix;
|
||||
var curMatrix = this.curMatrix;
|
||||
var ctx = this.ctx;
|
||||
|
||||
if (curMatrix)
|
||||
ctx.setTransform.apply(ctx, curMatrix);
|
||||
|
||||
if (matrix)
|
||||
ctx.transform.apply(ctx, matrix);
|
||||
|
||||
var scale = this.scale;
|
||||
ctx.scale(1 / scale[0], 1 / scale[1]);
|
||||
|
||||
return ctx.createPattern(this.canvas, 'repeat');
|
||||
}
|
||||
};
|
||||
return constructor;
|
||||
})();
|
||||
|
||||
|
||||
var PDFImage = (function() {
|
||||
function constructor(xref, res, image, inline) {
|
||||
this.image = image;
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user