“Graphics in overlapping bitmap layers” by Pike

  • ©Robert Pike

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    Graphics in overlapping bitmap layers

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Abstract:


    One of the common uses of bitmap terminals is storing multiple programming contexts in multiple, possibly overlapping, areas of the screen called windows. Windows traditionally store the visible state of a programming environment, such as an editor or debugger, while the user works with some other program. This model of interaction is attractive for one-process systems, but to make full use of a multiprogramming environment, windows must be asynchronously updated, even when partially or wholly obscured by other windows. For example, a long compilation may run in one window, displaying messages as appropriate, while the user edits a file in another window. This paper describes a set of low-level graphics primitives to manipulate overlapping asynchronous windows, called layers, on a bitmap display terminal. Unlike previous window software, these primitives extend the domain of the general bitmap operator bitblt to include bitmaps that are partially or wholly obscured.

References:


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    2. 2. GUIBAS, L. J., AND STOLFI, J. A language for bitmap manipulation. ACM Trans. Gr. 1, 3 (July 1982), 191-214.
    3. INGALLS, D. H. H. The Smalltalk graphics kernel. Byte 6, 8 (Aug. 1981), 168-194.
    4. LANTZ, K. A. AND RASHID, R. F. Virtual terminal management in a multiple process environment. In Proc. 7th Syrup. Operating Systems Principles (Pacific Grove, Calif., Dec. 10-12), ACM, New York, 1979, pp. 86-97.
    5. MEYROWITZ, N., AND MOSER, M. BRUWIN: An adaptable design strategy for window manager/ virtual terminal systems. In Proc. 8th Syrup. Operating Systems Principles 15, 5 (Pacific Grove, Calif., Dec. 14-16), ACM, New York, 1981, pp. 180-189.
    6. NEWMAN, W. M., AND SPROULL, R. F. Principles of Interactive Computer Graphics, 2nd ed. McGraw-Hill, New York, 1979
    7. TESLER, L. The Smalltalk environment. Byte 6, 8 (Aug. 1981), 90-147.
    8. WEINREB, D., AND MOON, D. Introduction to using the window system. Symbolics, Inc., 1981.


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