add code to parse bits per component information for images

2011-06-05 10:56:05 -07:00 · 2011-06-05 10:56:05 -07:00 · 386d70f33c
commit 386d70f33c
parent 378f381625
1 changed files with 15 additions and 0 deletions
--- a/pdf.js
+++ b/pdf.js
@ -1904,6 +1904,21 @@ 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") || dict.get("BPC");
+                if (!bitsPerComponent) {
+                    if (imageMask)
+                        bitsPerComponent = 1;
+                    else
+                        error("Bits per component missing in image");
+                }
+            }
+
            var tmpCanvas = document.createElement("canvas");
            tmpCanvas.width = w;
            tmpCanvas.height = h;