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<TITLE> [Mono-bugs] [Bug 75430][Nor] New - libgdiplus fails to convert
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indexed image formats
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<H1>[Mono-bugs] [Bug 75430][Nor] New - libgdiplus fails to convert
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indexed image formats</H1>
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<B>bugzilla-daemon at bugzilla.ximian.com</B>
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<A HREF="mailto:mono-bugs%40lists.ximian.com?Subject=%5BMono-bugs%5D%20%5BBug%2075430%5D%5BNor%5D%20New%20-%20libgdiplus%20fails%20to%20convert%0A%09indexed%20image%20formats&In-Reply-To=bug-75430%40chernobyl.ximian.com"
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TITLE="[Mono-bugs] [Bug 75430][Nor] New - libgdiplus fails to convert
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indexed image formats">bugzilla-daemon at bugzilla.ximian.com
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</A><BR>
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<I>Thu Jun 30 21:11:14 EDT 2005</I>
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<!--beginarticle-->
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<PRE>Please do not reply to this email- if you want to comment on the bug, go to the
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URL shown below and enter your comments there.
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Changed by <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">notzcoolx at yahoo.es.</A>
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<A HREF="http://bugzilla.ximian.com/show_bug.cgi?id=75430">http://bugzilla.ximian.com/show_bug.cgi?id=75430</A>
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--- shadow/75430 2005-06-30 21:11:14.000000000 -0400
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+++ shadow/75430.tmp.2858 2005-06-30 21:11:14.000000000 -0400
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@@ -0,0 +1,74 @@
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+Bug#: 75430
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+Product: Mono: Class Libraries
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+Version: 1.1
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+OS:
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+OS Details: Mac OS 10.4.1
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+Status: NEW
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+Resolution:
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+Severity:
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+Priority: Normal
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+Component: Sys.Drawing.
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+AssignedTo: <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">mono-bugs at ximian.com</A>
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+ReportedBy: <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">notzcoolx at yahoo.es</A>
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+QAContact: <A HREF="http://lists.ximian.com/mailman/listinfo/mono-bugs">mono-bugs at ximian.com</A>
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+TargetMilestone: ---
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+URL:
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+Cc:
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+Summary: libgdiplus fails to convert indexed image formats
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+
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+Description of Problem:
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+In Mac OS X 10.4.1 with Mono 1.1.8.1 (from pkg of mono-project.com)
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+libgdiplus fails when asked to convert from an indexed image to a 32b ARGB image.
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+
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+
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+Steps to reproduce the problem:
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+1. Compile this program:
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+
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+--- CUT ---
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+using System;
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+using System.Drawing;
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+using System.Drawing.Imaging;
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+
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+class Texture
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+{
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+ public static void LoadTexture(string fileName) {
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+ Bitmap bitmap = (Bitmap) Image.FromFile(fileName);
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+
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+ Rectangle rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
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+ BitmapData bitmapdata =
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+ bitmap.LockBits(rect,
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+ ImageLockMode.ReadOnly,
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+ PixelFormat.Format32bppArgb);
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+ /* Do somenthing */
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+ bitmap.UnlockBits(bitmapdata);
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+ bitmap.Dispose();
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+ }
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+
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+ public static void Main(string[] args) {
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+ LoadTexture(args[0]);
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+ }
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+}
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+--- CUT ---
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+
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+2. Try it with 2 uncompressed bmp, one indexed and one 24bpp.
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+
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+Actual Results:
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+The test should fail in Mac with the indexed image but do not fail in Windows (.Net or Mono
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+1.1.8 (from installer)) or Linux (Mono 1.1.8 (compiled from Gentoo ebuild or SVN)).
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+
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+Expected Results:
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+Both images get processed fine and the program exits without output or exception.
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+
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+
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+How often does this happen?
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+With all indexed images I've tried.
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+
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+
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+Additional Information:
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+The problem seems to be in libgdiplus/src/bitmap.c at gdip_bitmap_change_rect_pixel_format
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+called from GdipBitmapLockBits function. I haven't been able to compile and debug libgdiplus
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+from SVN but I think that the problem lies when that function call
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+gdip_is_pixel_format_conversion_valid (but I don't know exactly).
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+I remeber that some months ago (about six) I tried the program I extracted this test in Linux and
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+also failed but since 1.1.6 or 1.1.7 it doesn't fail in Linux neither (it always worked in Windows
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+with .Net or Mono).
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</PRE>
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