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Filter-based Print Drivers: Overview

Filter-based Print Drivers: Overview. Outline. MetroDrv Architecture and Data Flow Filter Pipeline Implementation MetroDrv Filter Development Discussion Call to Action. Goals. Define MetroDrv and the key components Understand information flow

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Filter-based Print Drivers: Overview

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  1. Filter-based Print Drivers:Overview

  2. Outline • MetroDrv Architecture and Data Flow • Filter Pipeline Implementation • MetroDrv Filter Development Discussion • Call to Action

  3. Goals • Define MetroDrv and the key components • Understand information flow • Communicate the requirements for developing MetroDrv drivers • Windows Services • IHV Supplied Components • Present a set of sample filters for a MetroDrv driver • Developed by Software Imaging

  4. What is a MetroDrv driver? • Extension of the Version 3 driver architecture • Consumes Metro Spool Files in an extensible manner • Sibling of the Unidrv and PScript core drivers • Compatible with Windows XP and later • Enabler for document and color workflow scenarios • Persist richness of Avalon and Metro on paper • Return to WYSIWYG • High, wide and deep color from application to device

  5. MetroDrv Driver Components • Configuration Module • Vendor defined Version 3 configuration module for the filter pipeline processing capabilities and device capabilities • Requirements • Support Version 3 driver configuration: Unidrv, PScript, monolithic configuration module • PrintTicket/PrintCapabilities support • GDI to Metro Converter • Microsoft defined Version 3 driver rendering module • Performs necessary conversions to support Win32 applications • Processing Module (Filter Pipeline) • Vendor defined processing module that processes Metro Reach Package content into the output PDL • Filter Pipeline Configuration File • Vendor defined setup file that describes the filters in the pipeline, including ordering, input and output data types

  6. MetroDrv Driver Data Flow Provided by: Microsoft Win32 App WinFX App ISV IHV MetroDrv Driver Filter Pipeline Version 3 Driver Metro Filter 1 Conversion Render Module Config Module/ Plug-in Filter N

  7. Filter Pipeline:Components and Interfaces

  8. Filter Pipeline Outline • Supports multiple vendor supplied filters • Print Processing Filters • Color conversion Filters • Rendering Filters • Setup by Filter Pipeline Configuration File • XML file • Defines filters in the pipeline and input/output data types • Implicitly defines data processing order • Public Interfaces implemented by vendors • IPrintPipelineFilter • IInterFilterCommunicator

  9. Filter Pipeline Architecture Overview • Service: PrintFilterPipelineSvc • NT Authority\Local Service • Normal non-admin user • SeImpersonatePrivilege • SeCreateGlobalPrivilege • SeChangeNotifyPrivilege • Controls Filter Creation and Communication • Scheduler • Inter Filter Communicator • Property Bag • Handle notifications from / to spooler

  10. Filter Pipeline Architecture Overview Provided by: Filter Pipeline Control Logic Control Tree Watermark Microsoft Filters Reader/Writers ISV IHV Transparency Scheduler N-UP Value “Token” “Notify” “IDrvNotify” Property Bag PipelineManager PrintFilterPipelineSvc

  11. Filter Pipeline Configuration File <Filters> <Filter dll = “FirstFilter.dll" clsid = "{15e81b32-6838-49e9-a495-25664f3f09e9}" name = “Filter 1: NUp Filter" input = "{d4bb258b-ff10-4af0-b67e-bde41c5e0e1c}" output = "{f4873ed9-a87c-48e3-b6dd-f6e182fe97b8}“ /Filter> <Filter dll = “SecondFilter.dll" clsid = "{8c89b2aa-a151-4f94-92bf-7beaee679eab}" name = “Filter 2: Rendering Filter" input = "{f4873ed9-a87c-48e3-b6dd-f6e182fe97b8}" output = "{f50b8346-7a10-4d24-945c-1a2ca6fe9a11}“ /Filter> </Filters>

  12. Filter Interface interface IPrintPipelineFilter : IUnknown { HRESULT SetReadersWriters( IInterFilterCommunicator *pFilterCommunicator, IPrintPipelinePropertyBag *pIPropertyBag ); HRESULT ShutdownOperation( void ); HRESULT StartOperation( void ); }

  13. Filter Communicator Interface interface IInterFilterCommunicator : IUnknown { HRESULT RequestReader( const wchar_t *pszStream, EPrintPipelineStreamAccessMode accessMode, REFIID iidRepresentation, REFIID iidResultReader, void **ppReader ); HRESULT RequestWriter( const wchar_t *pszStream, EPrintPipelineStreamAccessMode accessMode, EPrintPipelineStreamChangeMode changeMode, REFIID iidRepresentation, REFIID iidResultWriter, void **ppWriter ); }

  14. Inter-Filter Communicator Details Provided by: Microsoft Filter Pipeline Manager IHV Metro Spool File Metro Reader Inter-Filter Communicator Filter 1 FixedDocument Writer FixedDocument FixedDocument Reader Inter-Filter Communicator Filter 2 … Stream Writer Stream Filter N

  15. Filter Pipeline Data Flow - Longhorn Managed Code PrintFilterPipelineSvc Spooler WinFX App Pipeline Manager FilterPipelinePrxy Port PrintQueue Selector Scheduler METRO Metro Reach Processing (Rich Content Structure) N-Up WaterMark Winspool.drv and Extensions Renderer WinFx Printing Support Unmanaged Code Reach and Serialization Services Microsoft Provided by: ISV Metro Spool File IHV

  16. Filter Pipeline Data Flow - Downlevel Managed Code Unmanaged Code PrintFilterPipelineSvc Spooler WinFX App Pipeline Manager MS Print Processor Port PrintQueue Selector METRO Scheduler N-Up WaterMark Winspool.drv and Extensions Renderer WinFx Printing Support Reach and Serialization Services Metro Spool File

  17. Consuming Metro in a DriverSoftware Imaging

  18. Outline • Introduction • Filter essentials • Building a reusable filter • Building functionality within the pipeline • Sample Filter Pipeline

  19. Software Imaging - Who are we? • Specialists in printing and imaging technologies • Founded 1989 • Over 80 million drivers shipped worldwide • Offices in North America, Japan and Europe • Unidrv specialists and developers • Developing solutions for the industry • MetroDrv host drivers • MetroDrv wide-gamut color printing (scRGB)

  20. Filter Essentials: Filter Types • Document modifier • e.g. booklet printing, watermark • Markup modifier • e.g. color conversion • Renderer • e.g. Raster conversion, print output formatting • Markup “simplifier” • Handling unsupported features • “Value add” • e.g. print preview, status monitor, accounting, archiving

  21. Filter Essentials: Handling the PrintTicket • Every filter is interested in the PrintTicket (PT)! • Three levels of PT: Job, Document, Page • Validation of the Print Ticket • Validate job-level PT • Merge with default PT and validate • For each document in the job • Merge doc-level PT with job-level PT and validate • For each page in the document • Merge page-level PT with doc-level PT and validate • Extract filter-relevant feature options

  22. Building a Reusable Filter • Metro in, Metro out • Rely on the PrintTicket for control • No device assumptions or dependencies • Example: 2-up filter

  23. Building Functionality Within the Pipeline • Combining filters to build features • Need inter-filter communication • Could be PrintTicket • Can use property bag • Example: Booklet • Page re-order filter • 2-up filter

  24. Sample Filter Pipeline

  25. Call To Action • Understand Windows codenamed “Longhorn” Print Architecture • Identify strategic devices to target the Metro Print Path • Identify extension scenarios • Understand the Windows Color System • Review the “Metro” v.7 specification and provide feedback to prninfo@microsoft.com • http://www.microsoft.com/whdc/device/print/metro.mspx • Start implementation with Beta 1! • Convert GDI/DDI based drivers to MetroDrv drivers • Explore the sample filters in Longhorn Beta 2 WDK • Consider on-device rendering with a RIP implementation • A reference implementation is planned for Longhorn Beta 2 tools

  26. Additional Resources: Web • Web resources • WS-Devices Profile: http://msdn.microsoft.com/webservices/understanding/specs/default.aspx?pull=/library/en-us/dnglobspec/html/devprof.asp • Printer Working Group http://www.pwg.org • WHDC Printing home page: http://www.microsoft.com/whdc/device/print/default.mspx • WHDC Still Imaging / WIA home page: http://www.microsoft.com/whdc/device/stillimage/default.mspx • Color Use Caseshttp://www.microsoft.com/whdc/device/display/color/WCS_cases.mspx • “Writing Effective Use Cases”, Alistair Cockburn, ISBN 0201702258

  27. Additional Resources: Other • E-mail • For developer print questions: prninfo@microsoft.com • For developer scan questions: wiainfo@microsoft.com • For developer color questions: mscolor@microsoft.com • Developer kit references: • SDK for Print Schema User Manual and Keywords: http://winfx.msdn.microsoft.com/library/en-us/printschema/PrintSchema/Overviews/PrintSchema_entry.asp • WDK for PT/PC interfaces: Reference\Printer Driver and Spooler Component Interfaces\Printer Driver Functions and Structures\Unidrv and Pscript Interfaces\Methods for PrintTicket Providers and Consumers • WinFX Print System Object • Documentation available in WinFX Beta 1 SDK

  28. © 2005 Microsoft Corporation. All rights reserved. This presentation is for informational purposes only. Microsoft makes no warranties, express or implied, in this summary.

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