C++将图像旋转正负90°及180°
//判断是否需要保存码图像
int iRotationType = 1; //自己根据情况设置，1 2 3
if (0 != iRotationType)
{
//申请三个通道的内存
char* pdataR = new char[Width * Height];
char* pdataG = new char[Width * Height];
char* pdataB = new char[Width * Height];
//pSrcdataR pSrcdataG pSrcdataB 为源数据内存
//pdataR pdataR pdataB 为旋转之后的内存
for (int h = 0; h < Height; h++)
{
for (int w = 0; w < Width; w++)
{
switch (iRotationType)
{
case 1:
{
//向右旋转90°
pdataR[(Width - w - 1) * Height + h] = pSrcdataR[h * Width + w];
pdataG[(Width - w - 1) * Height + h] = pSrcdataG[h * Width + w];
pdataB[(Width - w - 1) * Height + h] = pSrcdataB[h * Width + w];
break;
case 2:
{
//向左旋转90°
pdataR[w * Height + (Height - h - 1)] = pSrcdataR[h * Width + w];
pdataG[w * Height + (Height - h - 1)] = pSrcdataG[h * Width + w];
pdataB[w * Height + (Height - h - 1)] = pSrcdataB[h * Width + w];
break;
}
case 3:
{
//旋转180°
pdataR[(Height - h - 1) * Width + (Width - w - 1)] = pSrcdataR[h * Width + w];
pdataG[(Height - h - 1) * Width + (Width - w - 1)] = pSrcdataG[h * Width + w];
pdataB[(Height - h - 1) * Width + (Width - w - 1)] = pSrcdataB[h * Width + w];
break;
}
}
default:
break;
}
}
}
//主意宽高的变化
//判断宽高是否需要对调
if (1 == iRotationType || 2 == iRotationType)
{
//宽高进行交换
}
//TODO 将旋转好的内存，再进行通道合并即可，不再赘述。
//删除内存
delete[] pSrcdataR;
delete[] pdataR;
delete[] pdataG;
delete[] pdataB;
}