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What is the purpose of a render target?
A render target is a resource that inherits from the ID2D1RenderTarget interface. A render target creates resources for drawing and performs actual drawing operations. There are several kinds of render targets that can be used to render graphics in the following ways: ID2D1HwndRenderTarget objects render content to a window.
How are render targets set up in Win32?
Render targets can be set up for aliased or antialiased rendering. For rendering scenes with a large number of primitives, a developer can also render 2-D graphics in aliased mode and use D3D multisample antialiasing to achieve greater scalability. Render targets can also group drawing operations into layers represented by the ID2D1Layer interface.
Why are render targets associated with a bitmap?
Bitmap render target objects render content to an off-screen bitmap. DXGI render target objects render to a DXGI surface for use with Direct3D. Because a render target is associated with a particular rendering device, it is a device-dependent resource and ceases to function if the device is removed.
Can a GDI render target be used in Direct2D?
Rendering via GDI is possible only if the render target was created with the D2D1_RENDER_TARGET_USAGE_GDI_COMPATIBLE flag set. This is useful for applications that are primarily rendering with Direct2D but have an extensibility model or other legacy content that requires the ability to render with GDI.
Why do I need a DXGI render target?
DXGI render target objects render to a DXGI surface for use with Direct3D. Because a render target is associated with a particular rendering device, it is a device-dependent resource and ceases to function if the device is removed.
How do you render a drawing in Win32?
After you finished drawing, you call the ID2D1RenderTarget::EndDraw method. Between these calls, you use Draw and Fill methods to render drawing resources. Most Draw and Fill methods take a shape (either a primitive or a geometry) and a brush for filling or outlining the shape.
Do you change the bitmap of a DC render target?
Note Changing the target does not change the bitmap that an HWND render target presents from, nor does it change the bitmap that a DC render target blts to/from. This API makes it easy for an application to use a bitmap as a source (like in DrawBitmap) and as a destination at the same time.
What does id2d1rendertarget getpixelsize do?
ID2D1RenderTarget::GetPixelSize returns the size of the current target bitmap (or 0, 0) if there is no bitmap bound). ID2D1RenderTarget::GetSize returns the pixel size of the current bitmap scaled by the DPI of the render target. SetTarget does not affect the DPI of the render target.