Method and apparatus for antialiasing a region of a two-dimensional distance field representing an object

Abstract

A method and apparatus render a region of a distance field representing an object. The distance field is partitioned into a set of cells, where each cell includes a set of distance samples and a method for reconstructing the distance field within the cell using the distance samples. A set of source cells is selected from the set of cells of the distance field to enable the rendering of the region. Each source cell is represented as a geometric element in a world coordinate system. Each geometric element is associated with a texture map, where the texture map includes distance samples of the corresponding source cell of the geometric element. Each geometric element is transformed from the world coordinate system to a pixel coordinate system and texture mapped, using the distance samples, to determine a distance for each component of each pixel associated with the geometric element. The distance of each component of each pixel is mapped to an antialiased intensity of the component of the pixel.

Description

technical field [0001] The present invention relates generally to the field of computer graphics, and more particularly to the rendering of two-dimensional objects represented by distance fields. Background technique [0002] In the field of computer graphics, the rendering of two-dimensional objects is very important. Two-dimensional objects such as character shapes, business logos, and legend elements included in documents are rendered as static images or as a series of frames that make up an animation. Two-dimensional objects can be represented in several ways, and it is often the case that one representation is better than the other for certain operations such as rendering and editing. In this case, a conversion from one form to another is required. [0003] Although here we focus on the type (type) of numbers, which is probably the most common and important 2D object, the following instructions apply to all types of 2D objects. [0004] Let's start with some basic ba...

AI Technical Summary

Problems solved by technology

Since the focus of hinting is to improve the rendering quality of body type, such hinting will not work well for glyphs placed on arbitrary paths, and for dynamic glyphs

[0020] While high-quality filtering can be used to anti-alias grayscale glyphs in static documents containing only a limited number of font sizes and font patterns, filtering in dynamic glyphs tends to suffer from real-time rendering Requirements for restrictions

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