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gluScaleImage always return GL_OUT_OF_MEMORY while trying to resize image.

Posted on 2007-04-03
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Last Modified: 2013-12-06
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?
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Question by:huyntminh
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7 Comments
 
LVL 25

Expert Comment

by:InteractiveMind
ID: 18854355
Have you defined a rendering context?
0
 

Author Comment

by:huyntminh
ID: 18855240
I am new in Graphic programming as well as VS C++. :)
How can I define a rendering context?
0
 
LVL 25

Expert Comment

by:InteractiveMind
ID: 18856994
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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LVL 20

Expert Comment

by:ikework
ID: 18860566
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

0
 

Author Comment

by:huyntminh
ID: 18862770
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.
0
 
LVL 17

Accepted Solution

by:
davebytes earned 500 total points
ID: 18872699
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
0
 

Author Comment

by:huyntminh
ID: 18918231
Thanks davebytes. That's what I need so far.
Thanks all of you for answering this question.
Best regards.
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