Opencv的Mat、以及SDL图像数据转换

一、cv::Mat转SDL_Surface

SDL_Surface* MatToSurface(const cv::Mat& mat)

{

Uint32 sdlFormat = 0;

int channel = mat.channels();

switch (mat.type())

{

case CV_8UC3:

sdlFormat = SDL_PIXELFORMAT_BGR24;

break;

case CV_8UC4:

sdlFormat = SDL_PIXELFORMAT_BGRA32;

break;

default:

sdlFormat = SDL_PIXELFORMAT_UNKNOWN;

break;

}

if (sdlFormat == SDL_PIXELFORMAT_UNKNOWN)

return nullptr;

SDL_Surface* surface = SDL_CreateRGBSurfaceWithFormatFrom((void*)mat.data, mat.cols, mat.rows, 0, mat.step, sdlFormat);

return surface;

}

二、字符串转SDL_Surface

SDL_Surface* DataArrToSurface(unsigned char* imageData, unsigned __int64 imageSize)

{

SDL_RWops* rwops = SDL_RWFromMem(imageData, imageSize);

if (rwops)

{

SDL_Surface* surface = IMG_Load_RW(rwops, 1);

return surface;

}

return nullptr;

}

三、字节数组转cv:Mat

void DataArrToMat(unsigned char* imageData, unsigned __int64 imageSize, cv::Mat& image)

{

std::vector<uchar> picVec((uchar*)imageData, (uchar*)imageData + imageSize);

image = cv::imdecode(cv::Mat(picVec), cv::IMREAD_COLOR);

}

四、cv::Mat转字节数组

bool MatToDataArr(cv::Mat img, std::vector<uchar>& vecBuf)

{

return cv::imencode(".jpg", img, vecBuf);

}