Hi,
other ways of flipping:
* use osg::Image's flipVertical()
* just flip the texture coordinates
rgds
jp
Andrew Burnett-Thompson wrote:
Hmm, well that was easy!
The flipping of rows worked fine, to set the image I used GL_BGR for
pixel format only, keeping GL_RGB as internal pixel format (else I got a
gray square).
Thank you for an extremely helpful response :)
Andrew
On Thu, Aug 20, 2009 at 6:15 PM, Farshid Lashkari <fla...@gmail.com
<mailto:fla...@gmail.com>> wrote:
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
<andyb1...@yahoo.co.uk <mailto:andyb1...@yahoo.co.uk>> 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
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