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Merge pull request #1881 from yurydelendik/jbig2-2

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Adds lossless segment types; fixes generic region prediction flag
This commit is contained in:
Brendan Dahl 2012-07-09 14:35:47 -07:00
commit f98db29e0c
1 changed files with 11 additions and 1 deletions
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12
src/jbig2.js
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@ -795,6 +795,7 @@ var Jbig2Image = (function Jbig2ImageClosure() {
data, position, end];
break;
case 6: // ImmediateTextRegion
case 7: // ImmediateLosslessTextRegion
var textRegion = {};
textRegion.info = readRegionSegmentInformation(data, position);
position += RegionSegmentInformationFieldLength;
@ -841,13 +842,14 @@ var Jbig2Image = (function Jbig2ImageClosure() {
args = [textRegion, header.referredTo, data, position, end];
break;
case 38: // ImmediateGenericRegion
case 39: // ImmediateLosslessGenericRegion
var genericRegion = {};
genericRegion.info = readRegionSegmentInformation(data, position);
position += RegionSegmentInformationFieldLength;
var genericRegionSegmentFlags = data[position++];
genericRegion.mmr = !!(genericRegionSegmentFlags & 1);
genericRegion.template = (genericRegionSegmentFlags >> 1) & 3;
genericRegion.prediction = !!(genericRegionSegmentFlags & 4);
genericRegion.prediction = !!(genericRegionSegmentFlags & 8);
if (!genericRegion.mmr) {
var atLength = genericRegion.template == 0 ? 4 : 1;
var at = [];
@ -988,6 +990,10 @@ var Jbig2Image = (function Jbig2ImageClosure() {
region.at, decodingContext);
this.drawBitmap(regionInfo, bitmap);
},
onImmediateLosslessGenericRegion:
function SimpleSegmentVisitor_onImmediateLosslessGenericRegion() {
this.onImmediateGenericRegion.apply(this, arguments);
},
onSymbolDictionary:
function SimpleSegmentVisitor_onSymbolDictionary(dictionary,
currentSegment,
@ -1036,6 +1042,10 @@ var Jbig2Image = (function Jbig2ImageClosure() {
region.referenceCorner, region.combinationOperator, huffmanTables,
region.refinementTemplate, region.refinementAt, decodingContext);
this.drawBitmap(regionInfo, bitmap);
},
onImmediateLosslessTextRegion:
function SimpleSegmentVisitor_onImmediateLosslessTextRegion() {
this.onImmediateTextRegion.apply(this, arguments);
}
};