Merge pull request #1068 from notmasteryet/jpx6

JPX decoder

Makefile

@@ -36,6 +36,7 @@ PDF_JS_FILES = \
   stream.js \
   worker.js \
   ../external/jpgjs/jpg.js \
+  jpx.js \
 	$(NULL)
 
 # make server

examples/acroforms/index.html

@@ -23,6 +23,7 @@
   <script type="text/javascript" src="../../src/stream.js"></script>
   <script type="text/javascript" src="../../src/worker.js"></script>
   <script type="text/javascript" src="../../external/jpgjs/jpg.js"></script>
+  <script type="text/javascript" src="../../src/jpx.js"></script>
 
   <script type="text/javascript">
     // Specify the main script used to create a new PDF.JS web worker.

examples/helloworld/index.html

@@ -23,6 +23,7 @@
   <script type="text/javascript" src="../../src/stream.js"></script>
   <script type="text/javascript" src="../../src/worker.js"></script>
   <script type="text/javascript" src="../../external/jpgjs/jpg.js"></script>
+  <script type="text/javascript" src="../../src/jpx.js"></script>
 
   <script type="text/javascript">
     // Specify the main script used to create a new PDF.JS web worker.

src/parser.js

@@ -240,6 +240,10 @@ var Parser = (function ParserClosure() {
         var bytes = stream.getBytes(length);
         return new JpegStream(bytes, stream.dict, this.xref);
       }
+      if (name == 'JPXDecode' || name == 'JPX') {
+        var bytes = stream.getBytes(length);
+        return new JpxStream(bytes, stream.dict);
+      }
       if (name == 'ASCII85Decode' || name == 'A85') {
         return new Ascii85Stream(stream);
       }

src/stream.js

@@ -835,7 +835,7 @@ var JpegStream = (function JpegStreamClosure() {
     return bytesToString(this.bytes);
   };
   JpegStream.prototype.getChar = function jpegStreamGetChar() {
-      error('internal error: getChar is not valid on JpegStream');
+    error('internal error: getChar is not valid on JpegStream');
   };
   /**
    * Checks if the image can be decoded and displayed by the browser without any
@@ -869,6 +869,107 @@ var JpegStream = (function JpegStreamClosure() {
   return JpegStream;
 })();
 
+/**
+ * For JPEG 2000's we use a library to decode these images and
+ * the stream behaves like all the other DecodeStreams.
+ */
+var JpxStream = (function JpxStreamClosure() {
+  function JpxStream(bytes, dict) {
+    this.dict = dict;
+    this.bytes = bytes;
+
+    DecodeStream.call(this);
+  }
+
+  JpxStream.prototype = Object.create(DecodeStream.prototype);
+
+  JpxStream.prototype.ensureBuffer = function jpxStreamEnsureBuffer(req) {
+    if (this.bufferLength)
+      return;
+
+    var jpxImage = new JpxImage();
+    jpxImage.parse(this.bytes);
+
+    var width = jpxImage.width;
+    var height = jpxImage.height;
+    var componentsCount = jpxImage.componentsCount;
+    if (componentsCount != 1 && componentsCount != 3 && componentsCount != 4)
+      error('JPX with ' + componentsCount + ' components is not supported');
+
+    var data = new Uint8Array(width * height * componentsCount);
+
+    for (var k = 0, kk = jpxImage.tiles.length; k < kk; k++) {
+      var tileCompoments = jpxImage.tiles[k];
+      var tileWidth = tileCompoments[0].width;
+      var tileHeight = tileCompoments[0].height;
+      var tileLeft = tileCompoments[0].left;
+      var tileTop = tileCompoments[0].top;
+
+      var dataPosition, sourcePosition, data0, data1, data2, data3, rowFeed;
+      switch (componentsCount) {
+        case 1:
+          data0 = tileCompoments[0].items;
+
+          dataPosition = width * tileTop + tileLeft;
+          rowFeed = width - tileWidth;
+          sourcePosition = 0;
+          for (var j = 0; j < tileHeight; j++) {
+            for (var i = 0; i < tileWidth; i++)
+              data[dataPosition++] = data0[sourcePosition++];
+            dataPosition += rowFeed;
+          }
+          break;
+        case 3:
+          data0 = tileCompoments[0].items;
+          data1 = tileCompoments[1].items;
+          data2 = tileCompoments[2].items;
+
+          dataPosition = (width * tileTop + tileLeft) * 3;
+          rowFeed = (width - tileWidth) * 3;
+          sourcePosition = 0;
+          for (var j = 0; j < tileHeight; j++) {
+            for (var i = 0; i < tileWidth; i++) {
+              data[dataPosition++] = data0[sourcePosition];
+              data[dataPosition++] = data1[sourcePosition];
+              data[dataPosition++] = data2[sourcePosition];
+              sourcePosition++;
+            }
+            dataPosition += rowFeed;
+          }
+          break;
+        case 4:
+          data0 = tileCompoments[0].items;
+          data1 = tileCompoments[1].items;
+          data2 = tileCompoments[2].items;
+          data3 = tileCompoments[3].items;
+
+          dataPosition = (width * tileTop + tileLeft) * 4;
+          rowFeed = (width - tileWidth) * 4;
+          sourcePosition = 0;
+          for (var j = 0; j < tileHeight; j++) {
+            for (var i = 0; i < tileWidth; i++) {
+              data[dataPosition++] = data0[sourcePosition];
+              data[dataPosition++] = data1[sourcePosition];
+              data[dataPosition++] = data2[sourcePosition];
+              data[dataPosition++] = data3[sourcePosition];
+              sourcePosition++;
+            }
+            dataPosition += rowFeed;
+          }
+          break;
+      }
+    }
+
+    this.buffer = data;
+    this.bufferLength = data.length;
+  };
+  JpxStream.prototype.getChar = function jpxStreamGetChar() {
+    error('internal error: getChar is not valid on JpxStream');
+  };
+
+  return JpxStream;
+})();
+
 var DecryptStream = (function DecryptStreamClosure() {
   function DecryptStream(str, decrypt) {
     this.str = str;

src/worker_loader.js

@@ -23,7 +23,8 @@ var files = [
   'pattern.js',
   'stream.js',
   'worker.js',
-  '../external/jpgjs/jpg.js'
+  '../external/jpgjs/jpg.js',
+  'jpx.js'
 ];
 
 // Load all the files.

test/pdfs/.gitignore

@@ -22,4 +22,5 @@
 !issue918.pdf
 !smaskdim.pdf
 !type4psfunc.pdf
+!S2.pdf
 !zerowidthline.pdf

test/test_manifest.json

@@ -410,6 +410,12 @@
       "link": true,
       "type": "load"
     },
+    {  "id": "S2-eq",
+       "file": "pdfs/S2.pdf",
+       "md5": "d0b6137846df6e0fe058f234a87fb588",
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "issue1055",
       "file": "pdfs/issue1055.pdf",
       "md5": "3ba56c2e48dce81da8669b1b9cf98ff0",

test/test_slave.html

@@ -22,6 +22,7 @@
     <script type="text/javascript" src="/src/stream.js"></script>
     <script type="text/javascript" src="/src/worker.js"></script>
     <script type="text/javascript" src="/external/jpgjs/jpg.js"></script>
+    <script type="text/javascript" src="/src/jpx.js"></script>
     <script type="text/javascript" src="driver.js"></script>
 
     <script type="text/javascript">

web/viewer.html

@@ -26,6 +26,7 @@
         <script type="text/javascript" src="../src/stream.js"></script>  <!-- PDFJSSCRIPT_REMOVE -->
         <script type="text/javascript" src="../src/worker.js"></script>  <!-- PDFJSSCRIPT_REMOVE -->
         <script type="text/javascript" src="../external/jpgjs/jpg.js"></script>  <!-- PDFJSSCRIPT_REMOVE -->
+        <script type="text/javascript" src="../src/jpx.js"></script>  <!-- PDFJSSCRIPT_REMOVE -->
         <script type="text/javascript">PDFJS.workerSrc = '../src/worker_loader.js';</script> <!-- PDFJSSCRIPT_REMOVE -->
         <script type="text/javascript" src="viewer.js"></script>