US 5,671,345 AGranted

System and method for intercepting and reconstructing graphics management tool marking instructions

AssigneeApple Computer, Inc.

InventorVladimir Lhotak

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Abstract

The present invention is a method and system employing a glue code for: 1) intercepting low-level device dependent information from a graphics management interpreter software tool and 2) re-construct the low-level device dependent information into a high-level object oriented data representation for each object on a given page. The interpreter software is configured such that it transmits marking request signals and associated data to a fictitious frame buffer. However, the glue code of the present invention intercepts the marking request signals and associated data and transmits back receipt acknowledgment signals to the interpreter to make it think that it is writing to a frame buffer. As a result, the interpreter software transmits all marking requests and associated data to the glue code. The glue code then processes the low level device dependent information transmitted from the interpreter and reconstructs it into a high-level object oriented data representation using the information provided by the marking request.

Claims19

Dependent claims

A system having a processor for performing digital data processing in response to software code, said system generating data for driving a display device engine including interpreter software code for interpreting a first object-based page description that is formatted according to a first software language and converting said first page description into a marking request, said marking request being formatted according to said first software language, said interpreter software code being configured so as to transmit said marking request to a marking software code and await a marking request receipt acknowledgment signal back from said marking software code, said system comprising:

a first software code for intercepting said marking request originating from said interpreter software code, said first software code transmitting said marking request receipt acknowledgment signal to said interpreter software code in response to said marking request, said first software code evaluating said marking request to obtain marking request state information, said first software code combining previous marking request state information with said marking request state information to generate accumulated marking request state information, said first software code converting said marking request into an object-based display list description by interpreting said marking request and said accumulated marking state information, said display list description being formatted according to a second software language and providing individual object data;
a digital storage area for storing said display list description;
a second object-based software code for accessing said display list description from said digital storage area, for processing said display list description, and for converting said display list description into said data for driving said display device engine.

A system for generating data for driving a display device engine including interpreter software code for interpreting a first object-based page description that is formatted according to a first software language and converting said first page description into a marking request, said marking request being formatted according to said first software language, said interpreter software code being configured so as to transmit said marking request to a marking software code and awaits a marking request receipt acknowledgment signal back from said marking software code, said system comprising:

a first means for intercepting said marking request originating from said interpreter software code, said first means transmitting said marking request receipt acknowledgment signal to said interpreter in response to said marking request, said first means evaluating said marking request to obtain marking request state information, said first means combining previous marking request state information with said marking request state information to generate accumulated marking request state information, said first means converting said marking request into an object-based display list description by interpreting said marking request and said accumulated marking state information, said display list description being formatted according to a second software language and providing individual object data;
a digital storage area means for storing said display list description;
a second means for accessing said display list description from said digital storage area, for performing object-based processing on said display list description, and for converting said display list description into said data for driving said display device engine.

In a system for generating data for driving a display device engine including interpreter software code for interpreting a first object-based page description that is formatted according to a first software language and converting said first page description into a marking request, said marking request being formatted according to said first software language, said interpreter software code being configured so as to transmit said marking request to a marking software code and await a marking request receipt acknowledgment signal back from said marking software code, said method comprising the steps of:

intercepting said marking request originating from said interpreter software code and transmitting it to a first software code;
transmitting said marking request receipt acknowledgment signal from said first software code to said interpreter software code in response to said marking request;
evaluating said marking request to obtain marking request state information;
combining previous marking request state information with said marking request state information to generate accumulated marking request state information;
converting said marking request into an object-based display list description by interpreting said marking request and said accumulated marking state information, said display list description being formatted according to a second software language and providing individual object data;
storing said display list description into a digital storage area;
accessing said display list description from said digital storage area with an object-based second software code being formatted according to said second software language;
processing said display list description with said second software code;
converting said display list description into said data for driving said display device engine.

6 more elements

Dependencies are inferred from the claim text.