[Mono-bugs] [Bug 676362] New: Bitmap Clone does not format return image to requested PixelFormat

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Wed Mar 2 12:54:27 EST 2011



           Summary: Bitmap Clone does not format return image to requested
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.10.x
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: libgdiplus
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: brianbourke75 at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

Created an attachment (id=417123)
 --> (http://bugzilla.novell.com/attachment.cgi?id=417123)
Compile with "mcs -r:System.Drawing.dll GdipCloneBitmapAreaITestCase.cs"

User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; en-US) AppleWebKit/534.13
(KHTML, like Gecko) Chrome/9.0.597.107 Safari/534.13

When a call is made into Bitmap.Clone in which the PixelFormat is specified,
the newly cloned image will always return with the PixelFormat of the original
image. Browsing the code I was able to track it down to a call in the
libgdiplus library in the bitmap class.  In the GdipCloneBitmapAreaI method it
is making a call to gdip_bitmap_clone_data_rect on line 1089 to do all the
heavy lifting but the documentation for this method declared that it maintains
the PixelFormat.  I recommend changing the code at this point, to what I have
no idea, but I would imagine there are methods which convert the pixel format
as well.

Reproducible: Always

Steps to Reproduce:
1.Compile attached program
2.Run the resultant executable
3.If the code outputs "Format8bppIndexed", then it failed
Actual Results:  
The code outputs "Format8bppIndexed" every time.

Expected Results:  
The code should output "Format24bppRgb" to show that it modified the pixel

Please compile my test code with mcs -r:System.Drawing.dll
GdipCloneBitmapAreaITestCase.cs.  I tried this in .NET and it produced the
expected output of Format24bppRgb.

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