gluScaleImage always return GL_OUT_OF_MEMORY while trying to resize image.

I'm trying to resize image by using OpenGL function gluScaleImage, writen with VC++ MFC Windows App. However, it always return GL_OUT_OF_MEMORY.
Here is my code:
CImage* ResizeImage(UINT width, UINT height, std::string& error){
CString fileName
CImage *_image;
HRESULT hResult = _image->Load(fileName);
if (FAILED(hResult)) {
    return false;
}      
bool ret=false;
CBitmap *bmpObj = CBitmap::FromHandle(_image->operator HBITMAP());
BITMAP* bmpData = new BITMAP;
bmpObj->GetBitmap(bmpData);
      
BYTE* outBuf = (BYTE*)malloc(width * height * 4 * sizeof(BYTE));;

int iError = gluScaleImage(GL_RGB, _image.GetWidth(), _image.GetHeight(), GL_BITMAP, bmpData->bmBits, width, height, GL_BITMAP, outBuf);
      
HBITMAP hBitmap = CreateBitmap(width, height, bmpData->bmPlanes, bmpData->bmBitsPixel, outBuf);
bmpObj = CBitmap::FromHandle(hBitmap);
bmpObj->GetBitmap(bmpData);
_image->Destroy();
_image->Attach(hBitmap);
return ret;

Anyone here can help me?
huyntminhAsked:
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InteractiveMindCommented:
Have you defined a rendering context?
0
huyntminhAuthor Commented:
I am new in Graphic programming as well as VS C++. :)
How can I define a rendering context?
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InteractiveMindCommented:
Well, in Win32 you generally use the wglCreateContext() and wglMakeCurrent() functions

HDC hDC = GetDC( hWnd );
HGLRC hRC;
hRC = wglCreateContext( hDC );
wglMakeCurrent( hDC, hRC );

And then to clean up:

wglMakeCurrent( NULL, NULL );
wglDeleteContext( hRC );


However, if you cannot use Win32, then I think you can do something like this:

dc = new CClientDC(this);
ogld.create(dc->m_hDC);//this creates the rendering context

where ogld is your OpenGLDevice instance.
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ikeworkCommented:
hi huyntminh,

here is an example of gluScaleImage using glut:

http://profs.sci.univr.it/~colombar/html_openGL_tutorial/en/10texturemapping_016.html

you can download the glut-library here:

http://www.cs.uaf.edu/~cs381/GLUT/

tell us, if you need help implementing the "read_texture"-func in the example or anything else ..


good luck :)

ike

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huyntminhAuthor Commented:
To InteractiveMind:
   I have tried as you said but gluScaleImage still return GL_OUT_OF_MEMORY value.
To ikework:
   I'm still looking at your samples. :) Please give me more time to reply you.
Thanks all.
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davebytesCommented:
Few things:
1. Why are you using glu functions for this?  GDI can do this at least three or four different ways including stretchblt of bitmaps.  But for a longer solution, I found this discussion
http://www.codeguru.com/forum/showthread.php?t=289821
2. have you tried adding a printf right before the call, and can you tell us what the source and dest width/height are?
3. have you tried other sizes, multiple images, verified the incoming data is valid, etc.?

Seems like you have no need to be using GLU functions (I avoid them whenever possible, they are NOT designed for performance, and in some cases not for accuracy either!).  If you are actually pushing stuff to GL, there may be other approaches to achieve your end goal -- if you tell us your end goal! ;)

-d
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huyntminhAuthor Commented:
Thanks davebytes. That's what I need so far.
Thanks all of you for answering this question.
Best regards.
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