Loading a BMP image at a specific index in OpenGL

Question

I have to load a 24 bit BMP file at a certain (x,y) index of glut window from a file using OpenGL. I have found a function that uses glaux library to do so. Here the color mentioned in ignoreColor is ignored during rendering.

void iShowBMP(int x, int y, char filename[], int ignoreColor)
{
    AUX_RGBImageRec *TextureImage;
    TextureImage = auxDIBImageLoad(filename);
    int i,j,k;
    int width = TextureImage->sizeX;
    int height = TextureImage->sizeY;
    int nPixels = width * height;
    int *rgPixels = new int[nPixels];

    for (i = 0, j=0; i < nPixels; i++, j += 3)
    {
        int rgb = 0;
        for(int k = 2; k >= 0; k--)
        {
            rgb = ((rgb << 8) | TextureImage->data[j+k]);
        }

        rgPixels[i] = (rgb == ignoreColor) ? 0 : 255;
        rgPixels[i] = ((rgPixels[i] << 24) | rgb);
    }

    glRasterPos2f(x, y);
    glDrawPixels(width, height, GL_RGBA, GL_UNSIGNED_BYTE, rgPixels);

    delete []rgPixels;
    free(TextureImage->data);
    free(TextureImage);
}

But the problem is that glaux is now obsolete. If I call this function, the image is rendered and shown for a minute, then an error pops up (without any error message) and the glut window disappears. From the returned value shown in the console, it seems like a runtime error.

Is there any alternative to this function that doesn't use glaux? I have seen cimg, devil etc but none of them seems to work like this iShowBMP function. I am doing my project in Codeblocks.

I have to load every frame to keep the implementation consistent with other parts of the program. Also, the bmp file whose name has been passed as a parameter to the function has both width and height in powers of 2.

Answer 1

The last two free() statements were not getting executed for some unknown reasons, so the memory consumption was increasing. That's why the program was crashing after a moment. Later I solved it using stb_image.h.