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嘗試將ID2D1Bitmap(從ID2D1HwndRenderTarget創建)保存到PNG文件時遇到問題。輸出圖像只是空白的白色。從函數調用EndDraw()返回的HRESULT是-2003238894。如何將ID2D1Bitmap保存爲PNG文件
感謝您的任何幫助。
這裏是我的代碼:
HRESULT CImageUtil::SaveBitmapToFile(PCWSTR uri,ID2D1Bitmap* pBitmap,ID2D1RenderTarget* pRenderTarget)
{
HRESULT hr = S_OK;
ID2D1Factory *pD2DFactory = NULL;
IWICBitmap *pWICBitmap = NULL;
ID2D1RenderTarget *pRT = NULL;
IWICBitmapEncoder *pEncoder = NULL;
IWICBitmapFrameEncode *pFrameEncode = NULL;
IWICStream *pStream = NULL;
if (SUCCEEDED(hr))
{
hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &pD2DFactory);
}
//
// Create IWICBitmap and RT
//
UINT sc_bitmapWidth = pBitmap->GetSize().width;
UINT sc_bitmapHeight = pBitmap->GetSize().height;
if (SUCCEEDED(hr))
{
hr = m_pWICFactory->CreateBitmap(
sc_bitmapWidth,
sc_bitmapHeight,
GUID_WICPixelFormat32bppPBGRA,
WICBitmapCacheOnLoad,
&pWICBitmap
);
}
if (SUCCEEDED(hr))
{
D2D1_RENDER_TARGET_PROPERTIES rtProps = D2D1::RenderTargetProperties();
rtProps.pixelFormat = D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED);
rtProps.type = D2D1_RENDER_TARGET_TYPE_DEFAULT;
rtProps.usage = D2D1_RENDER_TARGET_USAGE_NONE;
hr = pD2DFactory->CreateWicBitmapRenderTarget(
pWICBitmap,
rtProps,
&pRT
);
}
if (SUCCEEDED(hr))
{
//
// Render into the bitmap
//
pRT->BeginDraw();
pRT->Clear(D2D1::ColorF(D2D1::ColorF::White));
pRT->DrawBitmap(pBitmap);
pRT->EndDraw();
}
if (SUCCEEDED(hr))
{
//
// Save image to file
//
hr = m_pWICFactory->CreateStream(&pStream);
}
WICPixelFormatGUID format = GUID_WICPixelFormat32bppPBGRA;
if (SUCCEEDED(hr))
{
hr = pStream->InitializeFromFilename(uri, GENERIC_WRITE);
}
if (SUCCEEDED(hr))
{
hr = m_pWICFactory->CreateEncoder(GUID_ContainerFormatPng, NULL, &pEncoder);
}
if (SUCCEEDED(hr))
{
hr = pEncoder->Initialize(pStream, WICBitmapEncoderNoCache);
}
if (SUCCEEDED(hr))
{
hr = pEncoder->CreateNewFrame(&pFrameEncode, NULL);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->Initialize(NULL);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->SetSize(sc_bitmapWidth, sc_bitmapHeight);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->SetPixelFormat(&format);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->WriteSource(pWICBitmap, NULL);
}
if (SUCCEEDED(hr))
{
hr = pFrameEncode->Commit();
}
if (SUCCEEDED(hr))
{
hr = pEncoder->Commit();
}
SafeRelease(&pD2DFactory);
SafeRelease(&pWICBitmap);
SafeRelease(&pRT);
SafeRelease(&pEncoder);
SafeRelease(&pFrameEncode);
SafeRelease(&pStream);
return hr;
}
是的,當我這樣編碼:pRT-> DrawBitmap(pBitmap); hr = pRT-> EndDraw()然後hr = -2003238894。這意味着調用DrawBitmap會出錯。如果我註釋掉行pRT-> DrawBitmap(...),那麼hr = S_OK。 – 2012-07-12 08:20:54
我想這個錯誤是因爲我繪製了不兼容的位圖。我使用WIC渲染目標來繪製Hwnd渲染目標的位圖。但我不知道如何解決它。 – 2012-07-12 08:39:50
我在此查找錯誤代碼:http://msdn.microsoft.com/en-us/library/windows/desktop/dd370979%28v=vs.85%29.aspx(0x88990012 = D2DERR_WRONG_FACTORY)。看起來問題是pBitmap和pRT不是由相同的ID2D1Factory對象創建的。 – 2012-07-12 22:31:48