Canon Kabushiki Kaisha

Other

Alexander Vincent Danilo

Kevin John Moore

Stephen Edward Ecob

Michael John Webb

Alexander Will

Michael Anthony Martin

Timothy John Lindquist

Craig William Northway

Matthew William Gallagher

In a method of compositing graphic elements in a pixel-based renderer, a first graphic element is received having a first color and a first opacity, and a second graphic element is received having a second color and a second opacity. A blend output is obtained from a blend function dependent on the first color and the second color, and a resultant color is determined of a compositing operation on the first and second graphic elements, with the resultant color being dependent on the blend output and otherwise being independent of the second color.

Implementing compositing operations on images

A mixed text and image layout algorithm capable of supporting Unicode text and arbitrary content definitions for geometric layout with worst case two-pass layout placement procedure. Layout of Unicode text requires a number of distinct processing steps commencing with classification of input characters into contiguous groups of identical directionality, writing system and possibly script (and language) followed by mapping of character groups to glyphs for display purposes followed by a layout taking into account font display characteristics, embedded directionality level and shape of container for layout contents. Layout is best-case achieved in a single layout pass and worst-case in two passes. During layout information is cached to facilitate incremental changes to an existing layout in order to minimize refresh operations for editing display purposes. An optional two-pass operation on the layout result may be used to generate ordered rendering operation to support so-called Z-index display. An optimized Unicode character classification method utilizing reduced memory is also disclosed. Additionally a method to selectively display caret location for mixed font and/or directional text is disclosed.

Method and apparatus for layout of text and image documents

A method () for generating a device driver in an information processing apparatus () for a device connected thereto, such as a printer (), is disclosed. The method () obtains a Printer Characterization File (PCF) which contains a characterization of the device () or a group of devices. The device driver is then generated by using the PCF to configure a Device Model Independent Printer Driver (DMIPD) stored with an application on an unchangeable memory, such as a CD-ROM.

Peripheral driver forward compatibility

A method is disclosed for activating the filling of a graphical object. The method generates, for a current scanline, a plurality of edge records associated with an edge of the object from a previously generated edge record for a previous scanline. One of these edge records comprises fractional data which defines a minimum position of the edge within the current scanline or on a border thereto with respect to a direction along said current scanline. Another of these edge records comprises fractional data which defines a maximum position of the edge within the current scanline or on a border thereto with respect to a direction along the current scanline. One of these edge records comprises fractional data which defines an exit position of the edge from the current scanline. The previously generated edge record comprises fractional data defining an exit point of the edge from the previous scanline. After the edge record generation step, the method then activates, for the current scanline, the filling of the graphical object over a run of pixels or pixel from a minimum pixel position to a maximum pixel position. The minimum pixel position is derived from rounding down a value equal to the fractional data of the edge record defining the minimum position, and the maximum pixel position is derived from rounding up a value equal to the fractional data of the edge record defining the maximum position.

Activating a filling of a graphical object

A method () and apparatus () is described for performing image rendering of high resolution computer generated images using limited memory and constrained rendering architectures. An image is segmented into a plurality of tiles (). A graphics renderer (), which is usually used for rendering low resolution images onto a display device (), is used to render one tile () at a time. The rendered tile images are combined to form a band of the image () and the image data of the band () is transferred to a printer engine () for printing. Each band () is rendered and transferred to the printer engine () until the whole image is printed.

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Killarney Heights, Australia

Alexander Vincent Danilo