我正在尝试使用 Windows 映像组件加载 32 位图像，将其翻转，然后将其再次保存回同一文件中

Question

我已经成功地将图像加载到Windows成像组件中，但我陷入了最后一步，我如何保存现在在PWICBITMAP变量中可用的图像。

。

我也想知道是否低于翻转位图映像的好方法？

这是我的代码：

IWICImagingFactory *pIWICFactory = NULL;
IWICFormatConverter* pWICConv = NULL;           //WIC converter
IWICBitmapDecoder *pIDecoder = NULL;
IWICBitmapFrameDecode *pIDecoderFrame  = NULL;
IWICBitmapFlipRotator *pIFlipRotator = NULL;
IWICBitmap *pWICBitmap = NULL;
CoInitializeEx(0, COINIT_MULTITHREADED);
HRESULT hr = CoCreateInstance(
            CLSID_WICImagingFactory,
            NULL,
            CLSCTX_INPROC_SERVER,
            IID_PPV_ARGS(&pIWICFactory)
            );

hr = pIWICFactory->CreateDecoderFromFilename(
   //(LPCWSTR)pszBMPFilePath,                  // Image to be decoded
   L"Bitmap.bmp",
   NULL,                           // Do not prefer a particular vendor
   GENERIC_READ,                   // Desired read access to the file
   WICDecodeMetadataCacheOnDemand, // Cache metadata when needed
   &pIDecoder                      // Pointer to the decoder
   );
if (SUCCEEDED(hr))
{
   hr = pIDecoder->GetFrame(0, &pIDecoderFrame);
}
//Create a format converter using the IWICImagingFactory to convert the 
//image data from one pixel format to another, handling dithering and 
//halftoning to indexed formats, palette translation and alpha thresholding.
if (SUCCEEDED(hr)) {
    hr = pIWICFactory->CreateFormatConverter(&pWICConv);
}
//Initialize the format converter with all sorts of information, including the frame that was
//decoded above
if (SUCCEEDED(hr))
    hr = pWICConv->Initialize(pIDecoderFrame,
        GUID_WICPixelFormat32bppPBGRA,   // Destination pixel format
        WICBitmapDitherTypeNone,
        NULL,
        0.f,
        WICBitmapPaletteTypeMedianCut);

if (SUCCEEDED(hr))
{
   hr = pIWICFactory->CreateBitmapFlipRotator(&pIFlipRotator);
}
    // Initialize the flip/rotator to flip the original source horizontally.
if (SUCCEEDED(hr))
{
    //hr = pIFlipRotator->Initialize(
    //    pIDecoderFrame,                     // Bitmap source to flip.
    //    WICBitmapTransformFlipHorizontal);  // Flip the pixels along the vertical y-axis.
    hr = pIFlipRotator->Initialize(
        pWICConv,                     // Bitmap source to flip.
        WICBitmapTransformFlipHorizontal);  // Flip the pixels along the vertical y-axis.
    /*hr = pIFlipRotator->Initialize(
        pIDecoderFrame,
        WICBitmapTransformFlipVertical);*/
    /*hr = pIFlipRotator->Initialize(
        pIDecoderFrame,
        WICBitmapTransformRotate180);*/
}
//Create the WICBitmap (mpImgWIC) from the Bitmap source (WIC Flip rotator)
hr = pIWICFactory->CreateBitmapFromSource(pIFlipRotator, WICBitmapCacheOnLoad, &pWICBitmap);

Answer 1

创建WicbitMap是不需要的。iwicbitmapfliprotator是一个iWicbitMapsource，您可以使用它来创建图像。

您需要创建一个iwicbitmapencencoder和iwicbitmapframeencode对象。

MSDN在这里有一个示例：https：//msdn.microsoft.com/en-us/library/windows/desktop/gg430021（v = vs.85）.aspx

MSDN的示例预计您将手动提供图像数据，但是您可以使用iwicbitmapframeencode :: Writesource方法直接从iwicbitmapfliprotator写入：桌面/EE690159（v = vs.85）.aspx