image scale algorithm

void ResizeBilinear(unsigned char pixel[], int w, int h, unsigned char* outTemp, int w2, int h2);
void BlinImageScale(unsigned char* pixelsIn, int w, int h, unsigned char* pixelsOut, int w2, int h2);
void BilinearBitmapScale(unsigned char* pixels, int oldPixelWidth, int oldPixelHeight, unsigned char* newPixls, int newPixelWidth, int newPixelHeight);
void BicubicResizeImage(unsigned char* in, int src_width, int src_height, unsigned char* out, int dest_width, int dest_height);
void BicubicInterpolationImage (const unsigned char* srcImage, int oldWidth, int oldHeight, unsigned char* newPixel, int newWidth, int newHeight);

//24bit bitmap load save test
void main()
{
    BITMAPINFOHEADER bitmapInfo;
    BITMAPINFOHEADER newBitmapInfo;

    unsigned char* pImage = NULL;
    LoadBitmap("test.bmp", bitmapInfo, pImage);
    int width = bitmapInfo.biWidth;
    int height = bitmapInfo.biHeight;

    newBitmapInfo = bitmapInfo;
    int newWidth = newBitmapInfo.biWidth = newBitmapInfo.biWidth/2;
    int newHeight = newBitmapInfo.biHeight = newBitmapInfo.biHeight/2;
    unsigned char* pNewImage = new unsigned char[newWidth*newHeight*3];

    CHECK_TIME_START(err);
    ResizeBilinear(pImage, width, height, pNewImage, newWidth, newHeight);
    CHECK_TIME_END(checkTime); if(!err) printf("ResizeBilinear %8.3f ms\r\n", checkTime);
    SaveBitmap24bitColor("test_bilinear.bmp", pNewImage, newWidth, newHeight);

    CHECK_TIME_START2;
    BlinImageScale(pImage, width, height, pNewImage, newWidth, newHeight);
    CHECK_TIME_END2(checkTime);    if(!err) printf("BlinImageScale %8.3f ms\r\n", checkTime);
    SaveBitmap24bitColor("test_bilinear2.bmp", pNewImage, newWidth, newHeight);

    CHECK_TIME_START2;
    BilinearBitmapScale(pImage, width, height, pNewImage, newWidth, newHeight);
    CHECK_TIME_END2(checkTime);    if(!err) printf("BilinearBitmapScale %8.3f ms\r\n", checkTime);
    SaveBitmap24bitColor("test_bilinear3.bmp", pNewImage, newWidth, newHeight);

    CHECK_TIME_START2;
    BicubicResizeImage(pImage, width, height, pNewImage, newWidth, newHeight);
    CHECK_TIME_END2(checkTime);    if(!err) printf("BicubicResizeImage %8.3f ms\r\n", checkTime);
    SaveBitmap24bitColor("test_Bicubic.bmp", pNewImage, newWidth, newHeight);

    CHECK_TIME_START2;
    BicubicInterpolationImage(pImage, width, height, pNewImage, newWidth, newHeight);
    CHECK_TIME_END2(checkTime);    if(!err) printf("BicubicInterpolationImage %8.3f ms\r\n", checkTime);
    SaveBitmap24bitColor("test_BicubicInterpolation.bmp", pNewImage, newWidth, newHeight);

    CResizeImage* resizeImage = new CResizeImage(pImage, bitmapInfo, pNewImage, newBitmapInfo);
    CHECK_TIME_START2;
    resizeImage->Resize();
    CHECK_TIME_END2(checkTime);    if(!err) printf("Lanczos resampling %8.3f ms\r\n", checkTime);
    SaveBitmap24bitColor("test_Lanczos.bmp", pNewImage, newWidth, newHeight);
    if(resizeImage)
        delete resizeImage;

    if(pImage)
        delete [] pImage;
    if(pNewImage)
        delete [] pNewImage;
}