Microsoft Technology Licensing, LLC

John Bronskill

Jonathan Edgar Fay

John Bradstreet

Daniel Gwozdz

Steven Andrew Cover

Edward W Connell

Ajai Sehgal

Tanuja Joshi

Alvy Ray Smith

Nicholas John Clay

Michel Gangnet

A system and method is described for rendering a warped brush stroke using a bitmap brush image, the brush stroke being along a arbitrarily curved guideline. The described system and method generate a piecewise linear approximation to the guideline followed by generating polygons with the aid of the linear segments such that the generated polygons are convex and contiguous linear segments result in contiguous polygons. A mapping is identified between segments of the bitmap brush and the polygons such that the corners or the boundaries of the segments of a segment map to the corners or boundaries of a corresponding polygon. The segment of the bitmap brush is mapped into the corresponding polygon using transformations that do not require visiting a pixel in the rendered warped brush stroke more than once. Examples of such transformations include bilinear transformations and texture mapping in combination with tiling.

System and method for drawing and painting with warped bitmap brushes

An image processing application employs the concept of integral pre-multiplied alpha channel, and combines the techniques of multi-resolution representation, graph-structured representation, and automatic and intelligent data type conversion in order to permit a computer user to mix and manipulate both raster and vector based images in a single user interface while remaining unaware of the different data types underlying the images.

Mixed but indistinguishable raster and vector image data types

A method for drawing a paint stroke with a bitmap brush having pixels located at locations definable in a Cartesian coordinate system. The paint stroke is created by defining a path of a guide line, the path having an arc-length and the guide line having a thickness, and scaling the bitmap brush as a function of the arc-length of the path and the thickness of the guide line. The bitmap brush is then transformed such that the x-axis of the bitmap brush generally aligns with the path and the y-axis of the bitmap brush generally aligns with an instantaneous normal to the path such that the bitmap brush is warped to the guide line.

System and method for drawing and painting with bitmap brushes

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John Bronskill