我在尝试将从ID2D1HwndRenderTarget创建的ID2D1Bitmap保存为PNG文件时遇到了问题。输出的图像只是空白的白色。从函数调用EndDraw()返回的HRESULT为-2003238894。
感谢任何帮助。
以下是我的代码:
感谢任何帮助。
以下是我的代码:
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;
}