ID2D1Bitmap到WICBitmap
时间: 2024-01-24 16:05:29 浏览: 30
要将一个 ID2D1Bitmap 对象转换为 WICBitmap ,你需要执行以下步骤:
1. 首先,你需要获取 ID2D1Bitmap 对象的像素数据。你可以使用 ID2D1Bitmap::CopyFromRenderTarget 方法将其从渲染目标中复制出来。例如:
```
D2D1_SIZE_U size = d2dBitmap->GetPixelSize();
UINT32 width = size.width;
UINT32 height = size.height;
ComPtr<ID2D1RenderTarget> renderTarget;
d2dBitmap->GetRenderTarget(&renderTarget);
ComPtr<ID2D1Bitmap> bitmap;
renderTarget->CreateBitmap(size, D2D1::BitmapProperties(), &bitmap);
renderTarget->BeginDraw();
renderTarget->DrawBitmap(d2dBitmap.Get(), D2D1::RectF(0, 0, width, height));
renderTarget->EndDraw();
D2D1_BITMAP_PROPERTIES bitmapProperties = {};
bitmap->GetDpi(&bitmapProperties.dpiX, &bitmapProperties.dpiY);
bitmap->GetPixelFormat(&bitmapProperties.pixelFormat);
std::vector<BYTE> pixels(width * height * 4);
D2D1_RECT_U rect{ 0, 0, width, height };
bitmap->CopyFromRenderTarget(&rect, d2dBitmap.Get());
bitmap->CopyPixels(nullptr, width * 4, pixels.size(), pixels.data());
```
2. 接下来,你需要创建一个 IWICImagingFactory 对象,并使用它来创建一个新的 IWICBitmap 对象。例如:
```
ComPtr<IWICImagingFactory> imagingFactory;
CoCreateInstance(CLSID_WICImagingFactory, nullptr, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&imagingFactory));
ComPtr<IWICBitmap> wicBitmap;
imagingFactory->CreateBitmap(width, height, GUID_WICPixelFormat32bppRGBA, WICBitmapCacheOnLoad, &wicBitmap);
```
3. 最后,将像素数据复制到 WICBitmap 对象中。例如:
```
WICRect rect{ 0, 0, static_cast<INT>(width), static_cast<INT>(height) };
wicBitmap->WritePixels(rect.Height, rect.Width * 4, pixels.size(), pixels.data());
```
现在,你已经成功将 ID2D1Bitmap 对象转换为 WICBitmap 对象。