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/usr/share/cups/examples/custom.drv is in cups-ppdc 2.2.7-1ubuntu2.

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// Include standard font and media definitions
#include <font.defs>
#include <media.defs>

// List the fonts that are supported, in this case all standard
// fonts...
Font *

// Manufacturer, model name, and version
Manufacturer "Foo"
ModelName "FooJet 2000"
Version 1.0

// Each filter provided by the driver...
Filter application/vnd.cups-raster 100 rastertofoo

// Supported page sizes
*MediaSize Letter
MediaSize A4

// Supported resolutions
*Resolution k 8 0 0 0 "600dpi/600 DPI"

// Option Group
Group "Footasm"

  // Boolean option
  Option "fooEnhance/Resolution Enhancement" Boolean AnySetup 10
    *Choice True/Yes "<</cupsCompression 1>>setpagedevice"
    Choice False/No "<</cupsCompression 0>>setpagedevice"

  // Multiple choice option
  Option "fooOutputType/Output Quality" PickOne AnySetup 10
    *Choice "Auto/Automatic Selection" "<</OutputType(Auto)>>setpagedevice"
    Choice "Text/Optimize for Text" "<</OutputType(Text)>>setpagedevice"
    Choice "Graph/Optimize for Graphics" "<</OutputType(Graph)>>setpagedevice"
    Choice "Photo/Optimize for Photos" "<</OutputType(Photo)>>setpagedevice"

// Specify the name of the PPD file we want to generate...
PCFileName "foojet2k.ppd"