Image forming apparatus and recording medium suitable for image forming processing based on PDL (page description language) which generates a display list using a speculative process before data analysis of an object of PDL is completed

• US 10,643,114 B2
• Filed: 11/07/2018
• Issued: 05/05/2020
• Est. Priority Date: 11/07/2017
• Status: Active Grant

• Current Assignee: KYOCERA Document Solutions, Inc. (Kyocera Corporation)
• Original Assignee: KYOCERA Document Solutions, Inc. (Kyocera Corporation)
• Inventors: Sato, Yasuhide
• Primary Examiner(s): Vo, Quang N
• Application Number:
  US16/182,613
• Publication Number:
  US 20190138863A1
• Time in Patent Office: 545 Days
• CPC Class Codes: G06F 3/1213 at an intermediate node or at the final node
• CPC Class Codes: G06F 3/1247 by conversion to printer ready format
• CPC Class Codes: G06K 15/1811 including high level document description only
• CPC Class Codes: G06K 15/1813 Page description language recognition
• CPC Class Codes: G06K 15/1822 Analysing the received data before processing
• CPC Class Codes: G06K 15/1849 using an intermediate representation, e.g. a list of graphical primitives
• CPC Class Codes: G06K 15/1857 involving parallel processing in the same printing apparatus
• CPC Class Codes: G06K 15/408 Handling exceptions, e.g. faults computer driven error handling and recovery for a printer G06F3/1234

Abstract

Provided is an image forming apparatus for further speeding up an image forming process. A first rendering core of a rendering core module executes data analysis of an object of PDL format printing information. A second rendering core executes a speculative process for generating a Display List for an object. A third rendering core executes a rendering process for a printout or display output based on the Display List generated by the second rendering core. In addition, data analysis by the first rendering core and the speculative process by the second rendering core are executed in parallel processing. As a result, the second rendering core can execute the generation of a Display List by a speculative process even without receiving a rendering command from the first rendering core.

Claims

1. An image forming apparatus comprising a control unit which is a processor that controls operation of the image forming apparatus by reading an application program stored in memory, wherein the control unit comprises:

a first rendering core for executing data analysis of an object of PDL format printing information;

a second rendering core for starting a speculative process for generating a Display List for the object before the data analysis is completed; and

a third rendering core for executing a rendering process based on the Display List generated by the second rendering core;

wherein

the first rendering core (i) acquires a rendering command for the object by executing the data analysis, (ii) acquires a path of the object wherein the path is included in the rendering command, and (iii) acquires a first setting value of a graphics attribute based on the rendering command;

the second rendering core, (i) after registering the path, generates the Display List by using a default setting value of the graphics attribute by the speculative process, (ii) when the default setting value of the graphics attribute is different from the first setting value of the graphics attribute based on the rendering command, determines that the speculative process for generating the Display List is a failure, and (iii) generates the Display List again by using the first setting value of the graphics attribute based on the rendering command by executing the data analysis; and

the data analysis by the first rendering core and the speculative process by the second rendering core are executed in parallel processing.

2. The image forming apparatus according to claim 1, further comprising

a storage device for storing the Display List;

wherein

the second rendering core, in the case where the speculative process for generating the Display List is the failure, causes the storage device to store the Display List up to the point immediately before the failure, checks data up to the point immediately before failure of the Display List stored in the storage device, and executes generation of a failed portion of the Display List.

3. A recording medium that is a non-transitory computer-readable recording medium for storing an image forming program executable on a computer of an image forming apparatus wherein the image forming apparatus comprises a control unit which is a processor and comprises a first rendering core, a second rendering core, and a third rendering core, and when the computer executes the image forming program:

the first rendering core executes data analysis of an object of PDL format printing information;

the second rendering core starts a speculative process for generating a Display List for the object before the data analysis is completed; and

the third rendering core executes a rendering process based on the Display List generated by the second rendering core;

wherein

the first rendering core (i) acquires a rendering command for the object by executing the data analysis, (ii) acquires a path of the object wherein the path is included in the rendering command, and (iii) acquires a first setting value of a graphics attribute based on the rendering command;

the second rendering core, (i) after registering the path, generates the Display List by using a default setting value of the graphics attribute by the speculative process, (ii) when the default setting value of the graphics attribute is different from the first setting value of the graphics attribute based on the rendering command, determines that the speculative process for generating the Display List is a failure, and (iii) generates the Display List again by using the first setting value of the graphics attribute based on the rendering command by executing the data analysis; and

the data analysis by the first rendering core and the speculative process by the second rendering core are executed in parallel processing.