ID2D1RenderTarget::CreateCompatibleRenderTarget(D2D1_SIZE_F,ID2D1BitmapRenderTarget**) method (d2d1.h)
Creates a bitmap render target for use during intermediate offscreen drawing that is compatible with the current render target.
Syntax
HRESULT CreateCompatibleRenderTarget(
D2D1_SIZE_F desiredSize,
ID2D1BitmapRenderTarget **bitmapRenderTarget
);
Parameters
desiredSize
Type: [in] D2D1_SIZE_F
The desired size of the new render target in device-independent pixels. The pixel size is computed from the desired size using the parent target DPI. If the desiredSize maps to a integer-pixel size, the DPI of the compatible render target is the same as the DPI of the parent target. If desiredSize maps to a fractional-pixel size, the pixel size is rounded up to the nearest integer and the DPI for the compatible render target is slightly higher than the DPI of the parent render target. In all cases, the coordinate (desiredSize.width, desiredSize.height) maps to the lower-right corner of the compatible render target.
bitmapRenderTarget
Type: [out] ID2D1BitmapRenderTarget**
When this method returns, contains a pointer to a pointer to a new bitmap render target. This parameter is passed uninitialized.
Return value
Type: HRESULT
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
Remarks
The bitmap render target created by this method is not compatible with GDI.
Examples
The following example uses the CreateCompatibleRenderTarget method to create an ID2D1BitmapRenderTarget and uses it to draw a grid pattern. The grid pattern is used as the source of an ID2D1BitmapBrush.
HRESULT DemoApp::CreateGridPatternBrush(
ID2D1RenderTarget *pRenderTarget,
ID2D1BitmapBrush **ppBitmapBrush
)
{
// Create a compatible render target.
ID2D1BitmapRenderTarget *pCompatibleRenderTarget = NULL;
HRESULT hr = pRenderTarget->CreateCompatibleRenderTarget(
D2D1::SizeF(10.0f, 10.0f),
&pCompatibleRenderTarget
);
if (SUCCEEDED(hr))
{
// Draw a pattern.
ID2D1SolidColorBrush *pGridBrush = NULL;
hr = pCompatibleRenderTarget->CreateSolidColorBrush(
D2D1::ColorF(D2D1::ColorF(0.93f, 0.94f, 0.96f, 1.0f)),
&pGridBrush
);
if (SUCCEEDED(hr))
{
pCompatibleRenderTarget->BeginDraw();
pCompatibleRenderTarget->FillRectangle(D2D1::RectF(0.0f, 0.0f, 10.0f, 1.0f), pGridBrush);
pCompatibleRenderTarget->FillRectangle(D2D1::RectF(0.0f, 0.1f, 1.0f, 10.0f), pGridBrush);
pCompatibleRenderTarget->EndDraw();
// Retrieve the bitmap from the render target.
ID2D1Bitmap *pGridBitmap = NULL;
hr = pCompatibleRenderTarget->GetBitmap(&pGridBitmap);
if (SUCCEEDED(hr))
{
// Choose the tiling mode for the bitmap brush.
D2D1_BITMAP_BRUSH_PROPERTIES brushProperties =
D2D1::BitmapBrushProperties(D2D1_EXTEND_MODE_WRAP, D2D1_EXTEND_MODE_WRAP);
// Create the bitmap brush.
hr = m_pRenderTarget->CreateBitmapBrush(pGridBitmap, brushProperties, ppBitmapBrush);
pGridBitmap->Release();
}
pGridBrush->Release();
}
pCompatibleRenderTarget->Release();
}
return hr;
}
The following code example uses the brush to paint a pattern.
// Paint a grid background.
m_pRenderTarget->FillRectangle(
D2D1::RectF(0.0f, 0.0f, renderTargetSize.width, renderTargetSize.height),
m_pGridPatternBitmapBrush
);
Code has been omitted from this example.
Requirements
Requirement | Value |
---|---|
Minimum supported client | Windows 7, Windows Vista with SP2 and Platform Update for Windows Vista [desktop apps | UWP apps] |
Minimum supported server | Windows Server 2008 R2, Windows Server 2008 with SP2 and Platform Update for Windows Server 2008 [desktop apps | UWP apps] |
Target Platform | Windows |
Header | d2d1.h |
Library | D2d1.lib |
DLL | D2d1.dll |