Hi Andrew, It looks like the original bitmap is in BGR format, so you will probably need to use the GL_BGR pixel format when calling setImage(). To unflip the image it seems like you can iterate backwards over the source image inside your copy loop:
ptrSourceRow = ptrSrcImage + ( (iHeight - 1 - i) * iStride); I believe this should fix your problems. Cheers, Farshid On Thu, Aug 20, 2009 at 9:46 AM, Andrew Thompson <[email protected]>wrote: > Hi there, > > I am trying to load an osg::Image using the setImage method - inparticular > I am copying a Managed bitmap (System.Drawing.Bitmap) to the osg::Image to > use it as a texture map. > > As you can see I'm having a few problems. Here's the osg::Image texture > mapped onto a quad when I load it in from file using osgDB::readImageFile > > [Image: > http://i137.photobucket.com/albums/q217/andyb1979/tquadreadimage.png ] > > Here's the same textured quad, but the osg::Image was created using > setImage and a copy from a managed bitmap > > [Image: > http://i137.photobucket.com/albums/q217/andyb1979/th_tquadsetimage.png ] > > As you can see the image seems to have been inverted and flipped! > > Here is my code to convert a managed bitmap to osg::Image. The input bitmap > has been loaded from file, is in the format 24bpp RGB. > > I know I'm getting the size/bits per pixel right as the output osg::Image > is the right shape and size, with no tearing. However I don't know why the > image is inverted! > > > Code: > > osg::ref_ptr<osg::Image> > SceneUtil::ManagedBitmapToOSGImage(System::Drawing::Bitmap ^ bitmap) > { > // > // Check params > // > > if (bitmap == nullptr) > { > throw gcnew Exception("Unable to convert > System::Drawing::Bitmap to osg::Image as the input image is null"); > } > > if (bitmap->PixelFormat != > System::Drawing::Imaging::PixelFormat::Format24bppRgb) > { > throw gcnew Exception("Unable to convert > System::Drawing::Bitmap to osg::Image as the input image must be in the > format Format24bppRgb"); > } > > // Create a new OSG Image > osg::ref_ptr<osg::Image> image = new osg::Image(); > > System::Drawing::Imaging::BitmapData ^ bitmapData = > bitmap->LockBits( > System::Drawing::Rectangle(0, 0, bitmap->Width, > bitmap->Height), > System::Drawing::Imaging::ImageLockMode::ReadOnly, > System::Drawing::Imaging::PixelFormat::Format24bppRgb); > > // Create data to hold the destination image > BYTE * ptrSrcImage = (BYTE*)bitmapData->Scan0.ToPointer(); > BYTE * ptrDestImage = new unsigned char [bitmap->Width * > bitmap->Height * 3]; > BYTE * ptrSourceRow = nullptr; > BYTE * ptrDestRow = nullptr; > > int iWidth = bitmapData->Width; > int iHeight = bitmapData->Height; > int iStride = bitmapData->Stride; > > // Copy the System::Drawing::Bitmap instance over line by line - > this gets around the > // lack of stride support in the osg::Image. > for(int i = 0; i < iHeight; i++) > { > // Get the source row pointer > ptrSourceRow = ptrSrcImage + (i * iStride); > > // Get the destination row pointer > ptrDestRow = ptrDestImage + (i * (iWidth * 3)); > > // Copy the source row to the destination row > memcpy(ptrDestRow, ptrSourceRow, iWidth * 3); > } > > // Set the data on the osg::Image > image->setImage( > bitmap->Width, > bitmap->Height, > 1, > GL_RGB, > GL_RGB, > GL_UNSIGNED_BYTE, > ptrDestImage, > osg::Image::USE_NEW_DELETE); > > bitmap->UnlockBits(bitmapData); > > return image; > } > > > > > Any ideas? > > Thank you! > > Andrew > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=16492#16492 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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