Drawing Practices for DWMĪvoid drawing directly to the primary display surface. When all else fails, disable window rendering by calling the DwmSetWindowAttribute function. The origin will instead be the origin of the back-buffer surface for your window: (0, 0). If you have a device context (DC) for a redirected window, the origin returned by GetDCOrgEx will not match the origin of your window on the screen.
Note that in Windows Vista and later versions of Windows, custom drawing only part of a top-level window will not provide the desired stale content in undrawn regions.ĪPIs such as GetDCOrgEx can be used to determine certain actual values. Use regions or layering to create shaped or blended windows. WS_EX_TRANSPARENT in the classic sense, without redirection, is useful for child windows in a hierarchy of windows that belong to the same thread, but is not intended for top-level windows. Top-level WS_EX_TRANSPARENT windows should be combined with a WS_EX_LAYERED style for the purposes of hit testing. Each window's content is already available to compose the screen image. With DWM composition turned on, obscured applications no longer receive WM_PAINT messages and are not asked to re-render. If your application handles dots per inch (dpi) scaling, you can declare an application as dpi-aware and prevent automatic scaling by setting the dpi-aware flag in the program's manifest or by calling the SetProcessDPIAware function during program initialization. This topic contains the following sections: This topic presents a set of best practices for using the Desktop Window Manager (DWM) APIs.
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