int TransformImageBuffer(unsigned char* pImageBuffer, int width, int height,unsigned char* targetImageBuffer)
{
//center flip
int nRet = 0;
int length = width * height;
for(int i = 0; i < length / 2; i++)
{
targetImageBuffer[i] = pImageBuffer[length -i -1];
targetImageBuffer[length -i -1] = pImageBuffer[i];
}
//vertical flip
for(int h = 0; h < height; h++)
{
int firstLine = h * width;
for(int w = 0; w < width /2; w++)
{
int temp = targetImageBuffer[firstLine + w];
targetImageBuffer[firstLine + w] = targetImageBuffer[firstLine + width - w - 1];
targetImageBuffer[firstLine + width - w - 1] = temp;
}
}
//horizon flip
for(int i = 0; i < length /2; i++)
{
int line = i / width;
int seq = i % width;
int mirrorPoint = (height - line - 1) * width - 1 + seq;
targetImageBuffer[i] = pImageBuffer[mirrorPoint];
targetImageBuffer[mirrorPoint] = pImageBuffer[i];
}
return nRet;
}