http://bugzilla.novell.com/show_bug.cgi?id=493047
Summary: Drawing a Bitmap which used LockBits and SetPixel
results in a black image
Classification: Mono
Product: Mono: Class Libraries
Version: 2.4.x
Platform: All
OS/Version: openSUSE 11.1
Status: NEW
Severity: Normal
Priority: P5 - None
Component: libgdiplus
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
Found By: ---
Created an attachment (id=284629)
--> (http://bugzilla.novell.com/attachment.cgi?id=284629)
Test case
User-Agent: Mozilla/5.0 (X11; U; Linux i686; fr; rv:1.9.0.7)
Gecko/2009022800 SUSE/3.0.7-1.1.6 Firefox/3.0.7
See test case (which has comments with more details).
For short: we have an unsafe FastBitmap class which contains a Bitmap and uses
the LockBits method.
We create a FastBitmap and set all of its pixel to red, then draw a clone of
the Bitmap contained in the FastBitmap.
With .NET, the image is red, with Mono, it is black (and is always all black,
regardless what the image can be like).
Note that we clone the bitmap before drawing it because we can't directly draw
the original bitmap due to it being locked. However, Mono doesn't mind if you
try to draw it directly, it still draws it as black, while .NET throws an
exception saying the Bitmap is locked.
This bug doesn't happen with Mono on Windows, most likely due to using the
original GDI+ library rather than libgdiplus.
Reproducible: Always
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