Adobe, Inc.

Other

Edward A Taft

Edward R Rowe

Eswar Priyadarshan

Elizabeth M McQuarrie

Kenneth S Anderson

Richard J Cohn

Nabeel A Al-Shamma

Jeff Young

In some embodiments, a method includes receiving an electronic document that comprising a list of one or more features specified for use during processing of the electronic document by an application. The method also includes determining if one or more specified features from the list of specified features is not supported by the application. The method includes executing an operation that is defined by a prescription associated with one or more specified features, in response to a determination that the one or more specified features is not supported by the application, wherein the prescription defines at least one of an operation to be performed or a restriction to be applied by the application as part of subsequent processing of the electronic document.

Prescriptions for nonsupported features of an electronic document

Methods and apparatus for displaying an electronic document on a display device coupled to a computer. The document includes text specified to be drawn using a desired font that is not on the computer. The methods and apparatus display the text and a region including the text initially using a substitute font different from the desired font; obtain the desired font from a source coupled to the computer for data transmission; and then redisplay the text and the region using the desired font. Aspects include the following features. The document has font description metrics for the desired font. The methods and apparatus read the font description metrics from the document before initially displaying the text; and use the font description metrics for the desired font to create the substitute font. The computer has font description metrics for the desired font, and the methods and apparatus use the font description metrics for the desired font to create the substitute font. The methods and apparatus adopt a font from a font resource on a local data store as the substitute font. The desired font is a font embedded in the document. The desired font is identified in the document; and obtaining the desired font includes obtaining the desired font from a font server.

Displaying electronic documents with substitute fonts

A method and apparatus for providing an optimized page-based electronic document file and downloading the optimized file. An optimized document file is created from a non-optimized electronic document. Page contents are contiguously written in the optimized file and a page offset table is provided in the optimized file that includes page offset information used to locate individual pages and objects of the document. Shared objects, such as fonts, are included in the file after the page contents. When downloading the optimized file from a host, the page offset information is read early and is used to download a specific page requested by the user without downloading other pages in the document. In one embodiment, a viewer downloads a first portion of the requested page, while all remaining portions of the requested page are located and requested by a finder process using the page offset table. In alternative embodiments, all objects for a full page may be requested at once. The requested page can thus be downloaded with only one connection to the host. Shared objects can optionally be downloaded interleaved between portions of the page contents that reference the shared objects. Alternatively, with the use of hint tables, shared and other objects can be read in one transaction identifying byte ranges in the document. The requested page is displayed to the user on an output display device. The order elements are displayed provides quick access to useful information and to active elements.

Method and apparatus for reading multi-page electronic documents

Method and apparatus for downloading multi-page electronic documents

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Mountain View, CA, United States of America

Edward A Taft