[Bug 740058] New: pngparse: improve parsing of the image

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740058
  GStreamer | gst-plugins-bad | unspecified

           Summary: pngparse: improve parsing of the image
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vineeth.tm at samsung.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Everytime a buffer is being provided from baseparse, we are parsing all the
data from the beginning.
 But since we would have already parsed some of the data in the previous
iterations,
 it doesnt make much sense to keep parsing the same everytime.
 Hence skipping the data which is already read in previous iterations to
improve the parsing performance.


  On testing with the sample image MARBLE24.PNG(2.1 MB) @
http://www.fileformat.info/format/png/sample/index.htm

  The data chunks being read using the for loop is being called 4610 times with
the present implementation.
  On applying my patch it will be reduced to 518 times.

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