c_cpp 使用GDI +组合图像

Posted 2021-05-14

VOID OnPaint_TryCombineImage(HDC hdc)
{
    Graphics graphics(hdc);
    Image image(L"qrcode1.bmp");
    CLSID clsid;
    Status status;
    UINT  num;        // number of image encoders
    UINT  size;       // size, in bytes, of the image encoder array
    ImageCodecInfo* pImageCodecInfo;

    Bitmap bitmap(image.GetWidth()*3, image.GetHeight(), PixelFormat24bppRGB);
    Graphics* pg = Graphics::FromImage(&bitmap);
    SolidBrush solidBrush(Color(255, 255, 255, 255));

    pg->FillRectangle(&solidBrush, 0, 0, image.GetWidth()*3, image.GetHeight());
    pg->DrawImage(&image, 0, 0);
    pg->DrawImage(&image, 200, 0);

    CachedBitmap cachedBitmap(&bitmap, &graphics);
    graphics.DrawCachedBitmap(&cachedBitmap, 0, 0);

    GetImageEncodersSize(&num, &size);
    pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
    GetImageEncoders(num, size, pImageCodecInfo);
    clsid = pImageCodecInfo[0].Clsid;

    status = bitmap.Save(L"output.bmp", &clsid, NULL);
    printf("status=%d\n", status);

    delete pg;
}