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refactored colorspace into own class

sbarman 14 years ago
parent
5a1a35813b
commit
a5be9c4648
1 changed files with 181 additions and 64 deletions
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  1. 245
      pdf.js

245
pdf.js
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@ -3266,7 +3266,6 @@ var CanvasExtraState = (function() { @@ -3266,7 +3266,6 @@ var CanvasExtraState = (function() {
this.fontSize = 0;
this.textMatrix = IDENTITY_MATRIX;
this.leading = 0;
this.colorSpace = null;
// Current point (in user coordinates)
this.x = 0;
this.y = 0;
@ -3906,51 +3905,32 @@ var CanvasGraphics = (function() { @@ -3906,51 +3905,32 @@ var CanvasGraphics = (function() {
// Color
setStrokeColorSpace: function(space) {
// TODO real impl
this.current.strokeColorSpace =
ColorSpace.parse(space, this.xref, this.res);
},
setFillColorSpace: function(space) {
// TODO real impl
if (space.name === "Pattern")
this.current.fillColorSpace = "Pattern";
else
this.current.fillColorSpace = "DeviceRGB";
this.current.fillColorSpace =
ColorSpace.parse(space, this.xref, this.res);
},
setStrokeColor: function(/*...*/) {
// TODO real impl
if (1 === arguments.length) {
this.setStrokeGray.apply(this, arguments);
} else if (3 === arguments.length) {
this.setStrokeRGBColor.apply(this, arguments);
} else if (4 === arguments.length) {
this.setStrokeCMYKColor.apply(this, arguments);
}
var cs = this.getStrokeColorSpace();
var color = cs.getRgb(arguments);
this.setStrokeRGBColor.apply(this, color);
},
setStrokeColorN: function(/*...*/) {
// TODO real impl
TODO("check for special color spaces");
this.setStrokeColor.apply(this, arguments);
},
setFillColor: function(/*...*/) {
// TODO real impl
if (1 === arguments.length) {
this.setFillGray.apply(this, arguments);
} else if (3 === arguments.length) {
this.setFillRGBColor.apply(this, arguments);
} else if (4 === arguments.length) {
this.setFillCMYKColor.apply(this, arguments);
}
var cs = this.getFillColorSpace();
var color = cs.getRgb(arguments);
this.setFillRGBColor.apply(this, color);
},
setFillColorN: function(/*...*/) {
// TODO real impl
var colorSpace = this.current.fillColorSpace;
if (!colorSpace) {
var stateStack = this.stateStack;
var i = stateStack.length - 1;
while (!colorSpace && i >= 0) {
colorSpace = stateStack[i--].colorSpace;
}
}
var cs = this.getStrokeColorSpace();
if (this.current.fillColorSpace == "Pattern") {
if (cs.name == "Pattern") {
var patternName = arguments[0];
if (IsName(patternName)) {
var xref = this.xref;
@ -4328,12 +4308,35 @@ var CanvasGraphics = (function() { @@ -4328,12 +4308,35 @@ var CanvasGraphics = (function() {
var bi = (255 * (1 - Math.min(1, y * (1 - k) + k))) | 0;
return "rgb("+ ri +","+ gi +","+ bi +")";
},
getColorSpaceObj(colorSpace) {
if (IsName(colorSpace)) {
var name = colorSpace.name;
} else if (IsArray(colorSpace)) {
var name = colorSpace[0];
}
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
@ -4352,20 +4355,43 @@ var CanvasGraphics = (function() { @@ -4352,20 +4355,43 @@ var CanvasGraphics = (function() {
})();
var ColorSpace = (function() {
function constructor(xref, cs) {
function constructor() {
error("should not call ColorSpace constructor");
};
constructor.parse = function colorspace_parse(cs, xref, res) {
if (IsName(cs)) {
var colorSpaces = res.get("ColorSpace");
var refcs = colorSpaces.get(cs.name);
if (refcs)
cs = refcs;
}
cs = xref.fetchIfRef(cs);
if (IsName(cs)) {
var mode = cs.name;
this.mode = mode;
switch(mode) {
case "DeviceGray":
case "G":
this.numComps = 1;
return new DeviceGrayCS();
break;
case "DeviceRGB":
this.numComps = 3;
case "RGB":
return new DeviceRgbCS();
break;
case "DeviceCMYK":
case "CMYK":
return new DeviceCmykCS();
break;
case "Pattern":
return new PatternCS(null);
break;
default:
error("unrecognized colorspace " + mode);
}
TODO("fill in color space constructor");
} else if (IsArray(cs)) {
var mode = cs[0].name;
this.mode = mode;
@ -4376,27 +4402,49 @@ var ColorSpace = (function() { @@ -4376,27 +4402,49 @@ var ColorSpace = (function() {
switch (mode) {
case "DeviceGray":
case "G":
this.stream = stream;
this.dict = stream.dict;
this.numComps = 1;
return new DeviceGrayCS();
break;
case "DeviceRGB":
case "RGB":
return new DeviceRgbCS();
break;
case "DeviceCMYK":
case "CMYK":
return new DeviceCmykCS();
break;
case "CalGray":
return new DeviceGrayCS(stream);
break;
case "CalRGB":
return new DeviceRgbCS(stream);
break;
case "ICCBased":
var dict = stream.dict;
this.stream = stream;
this.dict = dict;
this.numComps = dict.get("N");
var numComps = dict.get("N");
if (numComps == 1)
return new DeviceGrayCS();
else if (numComps == 3)
return new DeviceRgbCS();
else if (numComps == 4)
return new DeviceCmykCS();
break;
case "Pattern":
return new PatternCS();
case "Indexed":
this.stream = stream;
this.dict = stream.dict;
var base = cs[1];
var hival = cs[2];
assertWellFormed(0 <= hival && hival <= 255, "hival in range");
var lookupTable = cs[3];
TODO("implement 'Indexed' color space");
this.numComps = 3; // HACK
break;
/*return new IndexedCS(stream);
this.stream = stream;
this.dict = stream.dict;
var base = cs[1];
var hival = cs[2];
assertWellFormed(0 <= hival && hival <= 255, "hival in range");
var lookupTable = cs[3];
TODO("implement 'Indexed' color space");
this.numComps = 3; // HACK
break;
*/
case "Lab":
case "Seperation":
case "DeviceN":
default:
error("unrecognized color space object '"+ mode +"'");
}
@ -4405,9 +4453,81 @@ var ColorSpace = (function() { @@ -4405,9 +4453,81 @@ var ColorSpace = (function() {
}
};
return constructor;
})();
var PatternCS = (function() {
function constructor() {
this.name = "Pattern";
}
constructor.prototype = {};
return constructor;
})();
var DeviceGrayCS = (function() {
function constructor() {
this.name = "DeviceGray";
this.numComps = 1;
this.defaultColor = [0];
};
constructor.prototype = {
getRgb: function graycs_getRgb(color) {
var c = color[0];
return [c, c, c];
},
getRgbBuffer: function graycs_getRgbBuffer(input) {
var length = colorBuf.length;
var rgbBuf = new Uint8Array(length);
for (var i = 0, j = 0; i < length; ++i) {
var c = input[i];
rgbBuf[j++] = c;
rgbBuf[j++] = c;
rgbBuf[j++] = c;
}
return rgbBuf;
}
};
return constructor;
})();
var DeviceRgbCS = (function() {
function constructor() {
this.name = "DeviceRGB";
this.numComps = 3;
this.defaultColor = [0, 0, 0];
}
constructor.prototype = {
getRgb: function graycs_getRgb(color) {
return color;
},
getRgbBuffer: function graycs_getRgbBuffer(input) {
return input;
}
};
return constructor;
})();
var DeviceCmykCS = (function() {
function constructor() {
this.name = "DeviceCMYK";
this.numComps = 4;
this.defaultColor = [0, 0, 0, 1];
}
constructor.prototype = {
getRgb: function graycs_getRgb(color) {
var c = color[0], y = color[1], m = color[2], k = color[3];
var ri = (1 - Math.min(1, c * (1 - k) + k)) | 0;
var gi = (1 - Math.min(1, m * (1 - k) + k)) | 0;
var bi = (1 - Math.min(1, y * (1 - k) + k)) | 0;
return [ri, gi, bi];
},
getRgbBuffer: function graycs_getRgbBuffer(colorBuf) {
error("conversion from rgb to cmyk not implemented for images");
return colorBuf;
}
};
return constructor;
})();
@ -4445,11 +4565,8 @@ var PDFImage = (function() { @@ -4445,11 +4565,8 @@ var PDFImage = (function() {
}
this.bpc = bitsPerComponent;
var colorSpaces = res.get("ColorSpace");
var csStream = xref.fetchIfRef(dict.get2("ColorSpace", "CS"));
if (IsName(csStream) && inline)
csStream = colorSpaces.get(csStream);
this.colorSpace = new ColorSpace(xref, csStream);
var colorSpace = dict.get2("ColorSpace", "CS");
this.colorSpace = ColorSpace.parse(colorSpace, xref, res);
this.numComps = this.colorSpace.numComps;
this.decode = dict.get2("Decode", "D");

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