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In Vista, more than the driver model was changed; the whole approach to graphics was changed Instead of each application drawing directly to the screen itself, a new technology, the Desktop Windows Manager (DWM), controls the display and updating of windows on the desktop In previous Windows versions, applications painted their visible display area directly to the buffer that was displayed by the video card This old approach meant that if you moved a window, the window might leave a trail or just blank area (see Figure 2-18) because the application that was behind the moving window had to be woken up and asked to repaint its display region via the WM_PAINT command
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FIGURE 2-18 In pre-Windows Vista, if the computer was busy or an application was under stress and could not redraw its screen buffer fast enough, a trail was left behind any moving windows DWM uses an offscreen buffer to composite the various applications individual offscreen graphical display buffers together and then draws the composite image to the onscreen buffer The DWM has the graphical content of each application, and for each screen refresh, it does not need the application to redraw its content; instead, it has a snapshot of the last display update it received from each application and uses that to composite the latest buffer onscreen, and it uses that snapshot rather than leaving a trail or a blank spot In Figure 2-19, you can see that each application draws to its own offscreen buffer The DWM then composites each of these application-speci c buffers together, based on their location on the screen, and then writes the completed composite offscreen buffer to the onscreen buffer to ensure a smooth display experience, no matter how busy an application is Although the DWM process is always running, it is essentially idle except when you run in Windows Aero graphical mode If you run in any other graphical mode, including Vista Basic, the DWM is
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not heavily used, and the trailing behavior still occurs because the display is not composited, and the features covered next are not available The DWM process still runs even in non-Windows Aero because it handles Windows ghosting, in which a nonresponsive window takes on a frosted appearance and says (Not Responding) to the end of the windows title
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FIGURE 2-19 A high-level overview of how DWM works via the virtual graphical buffers
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The fact that Vista has separate graphical buffers for each application allows for several facilities that create a far richer graphical environment The standard interface, as discussed previously, allows you to press Alt+Tab to cycle through the various running applications, but only minimal information is shown about each application For Windows Vista
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machines that run Windows Aero, the Alt+Tab task switcher looks different Instead of the application s icon being displayed in the list, a thumbnail of the actual applications screen buffer is shown (see Figure 2-20) This is possible because the DWM has each application s screen buffer stored and can use it for purposes other than just drawing to screen In addition, as the screen output from the application changes, so does its thumbnail, so if you were watching a video, the thumbnail on the task switcher would also be playing in real-time This new task switcher is known as Windows Flip Without switching to the application, you can get a quick idea of what the application is doing If you press Ctrl+Alt+Tab, the task switcher stays onscreen, and you can scroll through applications with the arrow keys
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FIGURE 2-20 With Windows Aero, the actual content of each application is displayed in
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This new graphical feature doesn t greatly affect your processor, but a good graphics card is recommended for Windows Vista to support Windows Aero and its associated features, such as Flip Most of the processing to render these new graphical features is passed to the graphical processing unit (GPU) on the graphics card instead of the main computer processor, which prevents too much additional overhead The main feature that is immediately visible in Windows Aero is the new translucent edges to applications (hence the previous name, Aero Glass), which are possible because the DWM has the content of each application in a separate buffer and can calculate what is required to be displayed, including adding light effects and shadows Figure 2-21 shows Aero (A) and non-Aero (Vista Basic) (B) versions of the same screen The application window edges are translucent in the Aero version, allowing you to see information behind the window Notice also that a button glows when selected The non-Aero screen displays none of the glass characteristics and does not look as polished
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