Direct2D中的IWICBitmap接口

IWICBitmap

Provides access to a rectangular area of the bitmap.

    IWICImagingFactory *pFactory = NULL;
    IWICBitmap *pBitmap = NULL;

    UINT uiWidth = 640;
    UINT uiHeight = 480;
    WICPixelFormatGUID formatGUID = GUID_WICPixelFormat32bppBGRA;

    WICRect rcLock = { 0, 0, uiWidth, uiHeight };
    IWICBitmapLock *pLock = NULL;

    HRESULT hr = CoCreateInstance(
        CLSID_WICImagingFactory,
        NULL,
        CLSCTX_INPROC_SERVER,
        IID_IWICImagingFactory,
        (LPVOID*)&pFactory
        );

    if (SUCCEEDED(hr))
    {
        hr = pFactory->CreateBitmap(uiWidth, uiHeight, formatGUID, WICBitmapCacheOnDemand, &pBitmap);
    }

    if (SUCCEEDED(hr))
    {
        hr = pBitmap->Lock(&rcLock, WICBitmapLockWrite, &pLock);

        if (SUCCEEDED(hr))
        {
            UINT cbBufferSize = 0;
            UINT cbStride = 0;
            BYTE *pv = NULL;

            hr = pLock->GetStride(&cbStride);

            if (SUCCEEDED(hr))
            {
                hr = pLock->GetDataPointer(&cbBufferSize, &pv);
            }

            // Clear the image data
            ZeroMemory(pv, cbBufferSize);

            // Release the bitmap lock.
            pLock->Release();
        }
    }

    if (pBitmap)
    {
        pBitmap->Release();
    }

    if (pFactory)
    {
        pFactory->Release();
    }

    return hr;