free barcode generator asp.net control The Device Section in Font

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The Device Section
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Section "Device" Identifier Driver EndSection "Videocard0" "nv"
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The Device section is created for the detected hardware video card and, like the InputDevice section for the keyboard, has Identifier and Driver attributes. Identifier serves the same purpose here by giving the video card a unique name so Xorg can identify the proper video card (in case you have another video card installed in your computer), and also so you can refer to that Device in other sections. The Driver section for the video card uses the driver attribute to tell Xorg what module to use to run it. You can see that the value for the Driver attribute in the section is called nv and is the module for the open-source driver for Nvidia-based video cards in this case. What you have here will depend on your hardware.
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Note: You can change the Driver value later to match the proprietary drivers in this Device section, but be sure you have followed the directions for installing that module within Xorg.
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The Screen Section
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Section "Screen" Identifier "Screen0" Device "Videocard0" DefaultDepth 24 SubSection "Display"
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CHAPTER 6 X WINDOWS SYSTEM
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Viewport Depth EndSubSection EndSection
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In the Screen section you specify items like the resolution or the number of colored pixels that must be used to display images on the monitor. In the Screen section in Listing 6-1, three attributes control the display, Identifier, Device, and DefaultDepth. The Identifier attribute serves the same purpose as in the previous sections; in this case, it has the value Screen0 enclosed in double-quotes. A new attribute called Device is used to tell Xorg which declared video card Xorg must use for this screen to provide the display. You can see that the value VideoCard0 is used, and refers to the previous Device section. As noted earlier, this is the point of an Identifier attribute something that can be referred to in other sections. The DefaultDepth attribute found in the Screen section defines the number of colors a pixel can use in bits. The attribute has value 24, the default bit-depth for this screen. This source for the DefaultDepth is found within the SubSection declaration of the Screen section called Display. The SubSection attribute lets you load modules that can be used within its enclosing Section and has the following syntax: SubSection ModuleName SubSectionEntry numericvalues SubSectionEntry stringvalues EndSubSection ModuleName is the name of the module that must be loaded for this Section and SubSectionEntry are the attributes for this SubSection. The attributes can also take values which can be used to alter the behavior of this SubSection that is going to be used by its enclosing Section. Within the Display SubSection, the Viewport and Depth attributes are used. Viewport specifies the upper and left coordinates of the initial display. These coordinates act as a marker for Xorg to let it know where to start showing information on the screen when it begins placing pixels in a left-right, up-down sequence for displaying images; Viewport is optional. The Depth attribute is the number of color bits this Display SubSection can use and holds the value 24. So this Display SubSection tells Xorg to use 0 in the upper and left coordinates of the screen as a starting point and to use 24 bits to provide the color depth for the screen display. Because of the DefaultDepth attribute in the Screen section, this Display SubSection is used by default when Xorg runs so you can have several Display subsections with different depths, and the DefaultDepth attribute says which one to use. You can have more than one SubSection declaration within your Screen section declaration if your video card can support other bit depths and resolutions. For example, let's assume your video card can support the resolution 1024x768 with 16 bits of color depth and 800x600 with 24 bits of color depth. You want the default resolution of 16 bits to be used when starting Xorg and have the other resolution ready if it is needed. You can adjust the Screen section to be similar to the one in Listing 6-2. Listing 6-2. A Screen Section for Multiple Bit-Depths and Resolutions Section "Screen" Identifier "Screen0" Device "Videocard0" DefaultDepth 16 SubSection "Display" Viewport 0 0 Depth 24 Modes 800x600 EndSubSection
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