akira
/
pdfjs-dist
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
Browse Source

Merge branch 'master' of github.com:andreasgal/pdf.js

Chris Jones 14 years ago
parent
a5731ddc47 2238905128
commit
58cb3e76b2
1 changed files with 238 additions and 77 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 315
      pdf.js

315
pdf.js
Unescape View File

@ -65,6 +65,19 @@ var Stream = (function() { @@ -65,6 +65,19 @@ var Stream = (function() {
return -1;
return bytes[this.pos++];
},
// returns subarray of original buffer
// should only be read
getBytes: function(length) {
var bytes = this.bytes;
var pos = this.pos;
var end = pos + length;
var strEnd = this.end;
if (end > strEnd)
end = strEnd;
this.pos = end;
return bytes.subarray(pos, end);
},
lookChar: function() {
var bytes = this.bytes;
if (this.pos >= this.end)
@ -78,15 +91,6 @@ var Stream = (function() { @@ -78,15 +91,6 @@ var Stream = (function() {
this.pos++;
return ch;
},
snarf: function(dest) {
var bytes = this.bytes;
var pos = this.pos;
var end = this.end;
var n = 0;
while (pos < end)
dest[n++] = bytes[pos++];
this.pos = this.end;
},
skip: function(n) {
if (!n)
n = 1;
@ -242,8 +246,8 @@ var FlateStream = (function() { @@ -242,8 +246,8 @@ var FlateStream = (function() {
this.eof = false;
this.codeSize = 0;
this.codeBuf = 0;
this.pos = 0;
this.bufferPos = 0;
this.bufferLength = 0;
}
@ -299,38 +303,48 @@ var FlateStream = (function() { @@ -299,38 +303,48 @@ var FlateStream = (function() {
buffer2[i] = buffer[i];
return this.buffer = buffer2;
},
getByte: function() {
var bufferLength = this.bufferLength;
var pos = this.pos;
if (bufferLength == pos) {
if (this.eof)
return;
this.readBlock();
}
return this.buffer[this.pos++];
},
getBytes: function(length) {
var pos = this.pos;
while (!this.eof && this.bufferLength < pos + length)
this.readBlock();
var end = pos + length;
var bufEnd = this.bufferLength;
if (end > bufEnd)
end = bufEnd;
this.pos = end;
return this.buffer.subarray(pos, end)
},
lookChar: function() {
var bufferLength = this.bufferLength;
var bufferPos = this.bufferPos;
if (bufferLength == bufferPos) {
var pos = this.pos;
if (bufferLength == pos) {
if (this.eof)
return;
this.readBlock();
}
return String.fromCharCode(this.buffer[bufferPos]);
return String.fromCharCode(this.buffer[pos]);
},
getChar: function() {
var ch = this.lookChar();
if (!ch)
return;
this.pos++;
this.bufferPos++;
return ch;
},
snarf: function(dest) {
// copy the leftover data in the buffer into dest
var bufferLength = this.bufferLength;
var bufferPos = this.bufferPos;
var n = 0;
while (bufferPos < bufferLength)
dest[n++] = this.buffer[bufferPos++];
// now use dest as our buffer and fill it
this.buffer = dest;
while (!this.eof)
this.readBlock();
// update stream position
this.pos = n;
},
skip: function(n) {
if (!n)
n = 1;
@ -1053,7 +1067,7 @@ var Parser = (function() { @@ -1053,7 +1067,7 @@ var Parser = (function() {
length = xref.fetchIfRef(length);
if (!IsInt(length)) {
error("Bad 'Length' attribute in stream");
lenght = 0;
length = 0;
}
// skip over the stream data
@ -1982,10 +1996,21 @@ var CanvasGraphics = (function() { @@ -1982,10 +1996,21 @@ var CanvasGraphics = (function() {
return;
xobj = this.xref.fetchIfRef(xobj);
assertWellFormed(IsStream(xobj), "XObject should be a stream");
var oc = xobj.dict.get("OC");
if (oc) {
TODO("oc for xobject");
}
var opi = xobj.dict.get("OPI");
if (opi) {
TODO("opi for xobject");
}
var type = xobj.dict.get("Subtype");
assertWellFormed(IsName(type), "XObject should have a Name subtype");
if ("Image" == type.name) {
this.paintImageXObject(xobj);
this.paintImageXObject(xobj, false);
} else if ("Form" == type.name) {
this.paintFormXObject(xobj);
} else if ("PS" == type.name) {
@ -2015,9 +2040,15 @@ var CanvasGraphics = (function() { @@ -2015,9 +2040,15 @@ var CanvasGraphics = (function() {
this.restore();
},
paintImageXObject: function(image) {
paintImageXObject: function(image, inline) {
this.save();
if (image.getParams) {
// JPX/JPEG2000 streams directly contain bits per component
// and color space mode information.
TODO("get params from actual stream");
// var bits = ...
// var colorspace = ...
}
// TODO cache rendered images?
var dict = image.dict;
@ -2026,6 +2057,10 @@ var CanvasGraphics = (function() { @@ -2026,6 +2057,10 @@ var CanvasGraphics = (function() {
if (w < 1 || h < 1)
error("Invalid image width or height");
var ctx = this.ctx;
// scale the image to the unit square
ctx.scale(1/w, 1/h);
var interpolate = dict.get2("Interpolate", "I");
if (!IsBool(interpolate))
@ -2034,13 +2069,9 @@ var CanvasGraphics = (function() { @@ -2034,13 +2069,9 @@ var CanvasGraphics = (function() {
if (!IsBool(imageMask))
imageMask = false;
// JPX/JPEG2000 streams directly contain bits per component
// and color space mode information.
var bitsPerComponent = image.bitsPerComponent;
var csMode = image.csMode;
if (!bitsPerComponent) {
bitsPerComponent = dict.get("BitsPerComponent", "BPC");
bitsPerComponent = dict.get2("BitsPerComponent", "BPC");
if (!bitsPerComponent) {
if (imageMask)
bitsPerComponent = 1;
@ -2049,57 +2080,140 @@ var CanvasGraphics = (function() { @@ -2049,57 +2080,140 @@ var CanvasGraphics = (function() {
}
}
if (bitsPerComponent !== 8)
error("Unsupported bpc");
var xref = this.xref;
var colorSpaces = this.colorSpaces;
if (imageMask) {
error("support image masks");
}
// actual image
var csStream = dict.get2("ColorSpace", "CS");
csStream = xref.fetchIfRef(csStream);
if (IsName(csStream) && inline)
csStream = colorSpaces.get(csStream);
var colorSpace = new ColorSpace(xref, csStream);
var decode = dict.get2("Decode", "D");
TODO("create color map");
var mask = image.dict.get("Mask");
mask = xref.fetchIfRef(mask);
var smask = image.dict.get("SMask");
smask = xref.fetchIfRef(smask);
if (IsStream(smask)) {
if (inline)
error("cannot combine smask and inlining");
var maskDict = smask.dict;
var maskW = maskDict.get2("Width", "W");
var maskH = maskDict.get2("Height", "H");
if (!IsNum(maskW) || !IsNum(maskH) || maskW < 1 || maskH < 1)
error("Invalid image width or height");
if (maskW !== w || maskH !== h)
error("Invalid image width or height");
var maskInterpolate = maskDict.get2("Interpolate", "I");
if (!IsBool(maskInterpolate))
maskInterpolate = false;
var maskBPC = maskDict.get2("BitsPerComponent", "BPC");
if (!maskBPC)
error("Invalid image mask bpc");
var maskCsStream = maskDict.get2("ColorSpace", "CS");
maskCsStream = xref.fetchIfRef(maskCsStream);
var maskColorSpace = new ColorSpace(xref, maskCsStream);
if (maskColorSpace.mode !== "DeviceGray")
error("Invalid color space for smask");
var maskDecode = maskDict.get2("Decode", "D");
if (maskDecode)
TODO("Handle mask decode");
// handle matte object
} else {
smask = null;
}
var tmpCanvas = document.createElement("canvas");
tmpCanvas.width = w;
tmpCanvas.height = h;
var tmpCtx = tmpCanvas.getContext("2d");
var imgData = tmpCtx.getImageData(0, 0, w, h);
var pixels = imgData.data;
// Read in image data
image.snarf(pixels);
var alpha = 25;
if (image.dict.has("SMask")) {
var smask = image.dict.get("SMask");
smask = this.xref.fetchIfRef(smask);
// Specifies either a shape or opacity mask to be
// applied to the image samples
TODO("SMask");
}
if (bitsPerComponent != 8)
error("unhandled number of bits per component");
if (smask) {
var smaskDict = smask.dict;
if (!smaskDict)
error("No dictionary for smask");
var smaskBitsPerComponent = smaskDict.get2("BitsPerComponent", "BPC");
if (!smaskBitsPerComponent)
error("Bad BPC for smask");
var max = (1 << bitsPerComponent) - 1;
var matte = smaskDict.get("Matte");
if (matte) {
TODO(matte);
if (maskColorSpace.numComps != 1)
error("Incorrect number of components in smask");
var numComps = colorSpace.numComps;
var imgArray = image.getBytes(numComps * w * h);
var imgIdx = 0;
var smArray = smask.getBytes(w * h);
var smIdx = 0;
var length = 4 * w * h;
switch (numComps) {
case 1:
for (var i = 0; i < length; i += 4) {
var p = imgArray[imageIdx++];
pixels[i] = p;
pixels[i+1] = p;
pixels[i+2] = p;
pixels[i+3] = smArray[smIdx++];
}
break;
case 3:
for (var i = 0; i < length; i += 4) {
pixels[i] = imgArray[imgIdx++];
pixels[i+1] = imgArray[imgIdx++];
pixels[i+2] = imgArray[imgIdx++];
pixels[i+3] = smArray[smIdx++];
}
break;
default:
error("unhandled amount of components per pixel: " + numComps);
}
// read in mask data
var mask = new Uint8Array(4 * w * h);
smask.snarf(mask);
// and blend images with it
var stop = 4 * w * h;
for (var i = 0; i < stop; ++i)
pixels[i] = pixels[i] * mask[i] / max;
} else {
// TODO blend if SMask is a mask image
var stop = 4 * w * h;
for (var i = 3; i < stop; i += 4)
pixels[i] = alpha;
var numComps = colorSpace.numComps;
var imgArray = image.getBytes(numComps * w * h);
var imgIdx = 0;
var length = 4 * w * h;
switch (numComps) {
case 1:
for (var i = 0; i < length; i += 4) {
var p = imgArray[imageIdx++];
pixels[i] = p;
pixels[i+1] = p;
pixels[i+2] = p;
pixels[i+3] = 255;
}
break;
case 3:
for (var i = 0; i < length; i += 4) {
pixels[i] = imgArray[imgIdx++];
pixels[i+1] = imgArray[imgIdx++];
pixels[i+2] = imgArray[imgIdx++];
pixels[i+3] = 255;
}
break;
default:
error("unhandled amount of components per pixel: " + numComps);
}
}
tmpCtx.putImageData(imgData, 0, 0);
this.ctx.drawImage(tmpCanvas, 0, 0);
ctx.drawImage(tmpCanvas, 0, 0);
this.restore();
},
@ -2138,3 +2252,50 @@ var CanvasGraphics = (function() { @@ -2138,3 +2252,50 @@ var CanvasGraphics = (function() {
return constructor;
})();
var ColorSpace = (function() {
function constructor(xref, cs) {
if (IsName(cs)) {
var mode = cs.name;
this.mode = mode;
switch(mode) {
case "DeviceGray":
case "G":
this.numComps = 1;
break;
}
TODO("fill in color space constructor");
} else if (IsArray(cs)) {
var mode = cs[0].name;
this.mode = mode;
var stream = cs[1];
stream = xref.fetchIfRef(stream);
switch (mode) {
case "DeviceGray":
case "G":
this.stream = stream;
this.dict = stream.dict;
this.numComps = 1;
break;
case "ICCBased":
var dict = stream.dict;
this.stream = stream;
this.dict = dict;
this.numComps = dict.get("N");
break;
default:
error("unrecognized color space object");
}
} else {
error("unrecognized color space object");
}
};
constructor.prototype = {
};
return constructor;
})();

Write Preview
Loading…
Cancel
Save