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Working version of predictors

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This commit is contained in:
sbarman 2011-06-17 16:06:02 -07:00
parent ce09870e2b
commit 3da5245abf
1 changed files with 82 additions and 72 deletions
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154
pdf.js
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@ -18,6 +18,7 @@ function warn(msg) {
} }
function error(msg) { function error(msg) {
console.trace();
throw new Error(msg); throw new Error(msg);
} }
@ -231,7 +232,7 @@ var FlateStream = (function() {
0x50007, 0x50017, 0x5000f, 0x00000 0x50007, 0x50017, 0x5000f, 0x00000
]), 5]; ]), 5];
function constructor(stream, params) { function constructor(stream) {
this.stream = stream; this.stream = stream;
this.dict = stream.dict; this.dict = stream.dict;
var cmf = stream.getByte(); var cmf = stream.getByte();
@ -510,6 +511,8 @@ var FlateStream = (function() {
var FilterPredictor = (function() { var FilterPredictor = (function() {
function constructor(str, type, width, colors, bits) { function constructor(str, type, width, colors, bits) {
this.str = str; this.str = str;
this.dict = str.dict;
this.type = type; this.type = type;
this.width = width; this.width = width;
this.colors = colors; this.colors = colors;
@ -536,11 +539,17 @@ var FilterPredictor = (function() {
if(!this.getNextLine()) if(!this.getNextLine())
return; return;
} }
return this.prevLine[this.prevIdx]; return this.prevLine[this.prevIdx++];
},
getBytes: function(length) {
var buf = new Uint8Array(length);
for (var i = 0; i < length; ++i)
buf[i] = this.getByte();
return buf;
}, },
getNextLine: function() { getNextLine: function() {
if (this.type >= 10) { if (this.type >= 10) {
var curType = this.str.getRawByte(); var curType = this.str.getByte();
if (!curType) if (!curType)
return; return;
curType += 10; curType += 10;
@ -550,7 +559,7 @@ var FilterPredictor = (function() {
var line = []; var line = [];
for (var i = 0; i < this.rowBytes - this.pixBytes; i++) for (var i = 0; i < this.rowBytes - this.pixBytes; i++)
line.push(this.str.getRawByte()); line.push(this.str.getByte());
var pixBytes = this.pixBytes; var pixBytes = this.pixBytes;
var rowBytes = this.rowBytes; var rowBytes = this.rowBytes;
@ -560,62 +569,62 @@ var FilterPredictor = (function() {
for (var i = 0, ii = pixBytes + 1; i < ii; ++i) for (var i = 0, ii = pixBytes + 1; i < ii; ++i)
upLeftBuf.push(0); upLeftBuf.push(0);
for (var i = pixBytes, ii = rowBybtes; i < ii; ++i) { for (var i = pixBytes, ii = rowBytes; i < ii; ++i) {
for (var j = pixBytes; j > 0; --j) { for (var j = pixBytes; j > 0; --j) {
upLeftBuf[j] = upLeftBuf[j - 1]; upLeftBuf[j] = upLeftBuf[j - 1];
upLeftBuf[0] = prevLine[i]; }
upLeftBuf[0] = prevLine[i];
var c = line[i - pixBytes]; var c = line[i - pixBytes];
if (!c) { if (c == undefined) {
if (i > pixBytes) if (i > pixBytes)
break;
return;
}
switch (curType) {
case 11:
prevLine[i] = prevLine[i - pixBytes] + c;
break; break;
case 12: return;
prevLine[i] = prevLine[i] + c; }
break; switch (curType) {
case 13: case 11:
prevLine[i] = ((prevLine[i - pixBytes] prevLine[i] = prevLine[i - pixBytes] + c;
+ prevLine[i]) >> 1) + c; break;
break; case 12:
case 14: prevLine[i] = prevLine[i] + c;
var left = prevLine[i - pixBytes]; break;
var up = prevLine[i]; case 13:
var upLeft = upLeftBuf[pixBytes]; prevLine[i] = ((prevLine[i - pixBytes]
var p = left + up - upLeft; + prevLine[i]) >> 1) + c;
break;
case 14:
var left = prevLine[i - pixBytes];
var up = prevLine[i];
var upLeft = upLeftBuf[pixBytes];
var p = left + up - upLeft;
var pa = p - left; var pa = p - left;
if (pa < 0) if (pa < 0)
pa = -pa; pa = -pa;
var pb = p - up; var pb = p - up;
if (pb < 0) if (pb < 0)
pb = -pb; pb = -pb;
var pc = p - upLeft; var pc = p - upLeft;
if (pc < 0) if (pc < 0)
pc = -pc; pc = -pc;
if (pa <= pb && pa <= pc) if (pa <= pb && pa <= pc)
prevLine[i] = left + c; prevLine[i] = left + c;
else if (pb <= pc) else if (pb <= pc)
prevLine[i] = up + c; prevLine[i] = up + c;
else else
prevLine[i] = upLeft + c; prevLine[i] = upLeft + c;
break; break;
case 10: case 10:
default: default:
prevLine[i] = c; prevLine[i] = c;
break; break;
}
} }
} }
var bits = this.bits; var bits = this.bits;
var colors = this.colors; var colors = this.colors;
if (curPred === 2) { if (curType === 2) {
if (bits === 1) { if (bits === 1) {
var inbuf = prevLine[pixBytes - 1]; var inbuf = prevLine[pixBytes - 1];
for (var i = pixBytes; i < rowBytes; i+= 8) { for (var i = pixBytes; i < rowBytes; i+= 8) {
@ -656,7 +665,7 @@ var FilterPredictor = (function() {
} }
} }
} }
prevIdx = pixBytes; this.prevIdx = pixBytes;
return true; return true;
} }
}; };
@ -680,9 +689,9 @@ var Name = (function() {
} }
constructor.prototype = { constructor.prototype = {
toString: function() { toString: function() {
return this.name; return this.name;
} }
}; };
return constructor; return constructor;
@ -694,9 +703,9 @@ var Cmd = (function() {
} }
constructor.prototype = { constructor.prototype = {
toString: function() { toString: function() {
return this.cmd; return this.cmd;
} }
}; };
return constructor; return constructor;
@ -709,18 +718,18 @@ var Dict = (function() {
constructor.prototype = { constructor.prototype = {
get: function(key) { get: function(key) {
return this.map[key]; return this.map[key];
}, },
get2: function(key1, key2) { get2: function(key1, key2) {
return this.get(key1) || this.get(key2); return this.get(key1) || this.get(key2);
}, },
has: function(key) { has: function(key) {
return key in this.map; return key in this.map;
}, },
set: function(key, value) { set: function(key, value) {
this.map[key] = value; this.map[key] = value;
}, },
forEach: function(aCallback) { forEach: function(aCallback) {
for (var key in this.map) for (var key in this.map)
aCallback(key, this.map[key]); aCallback(key, this.map[key]);
}, },
@ -784,7 +793,7 @@ function IsArray(v) {
} }
function IsStream(v) { function IsStream(v) {
return typeof v == "object" && "getChar" in v; return typeof v == "object" && "getByte" in v;
} }
function IsRef(v) { function IsRef(v) {
@ -1294,6 +1303,7 @@ var Parser = (function() {
if (!cols) if (!cols)
cols = 1; cols = 1;
log("Predictor being used");
flateStr = new FilterPredictor(flateStr, predType, cols, flateStr = new FilterPredictor(flateStr, predType, cols,
colors, bpc); colors, bpc);
} }
@ -2529,7 +2539,7 @@ var CanvasGraphics = (function() {
var smask = image.dict.get("SMask"); var smask = image.dict.get("SMask");
smask = xref.fetchIfRef(smask); smask = xref.fetchIfRef(smask);
if (IsStream(smask)) { if (smask) {
if (inline) if (inline)
error("cannot combine smask and inlining"); error("cannot combine smask and inlining");
@ -2559,8 +2569,6 @@ var CanvasGraphics = (function() {
if (maskDecode) if (maskDecode)
TODO("Handle mask decode"); TODO("Handle mask decode");
// handle matte object // handle matte object
} else {
smask = null;
} }
var tmpCanvas = document.createElement("canvas"); var tmpCanvas = document.createElement("canvas");
@ -2573,7 +2581,7 @@ var CanvasGraphics = (function() {
if (bitsPerComponent != 8) if (bitsPerComponent != 8)
error("unhandled number of bits per component"); error("unhandled number of bits per component");
if (smask) { if (false && smask) {
if (maskColorSpace.numComps != 1) if (maskColorSpace.numComps != 1)
error("Incorrect number of components in smask"); error("Incorrect number of components in smask");
@ -2711,6 +2719,8 @@ var ColorSpace = (function() {
case "DeviceGray": case "DeviceGray":
case "G": case "G":
this.numComps = 1; this.numComps = 1;
case "DeviceRGB":
this.numComps = 3;
break; break;
} }
TODO("fill in color space constructor"); TODO("fill in color space constructor");