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Annotation of researchv10dc/man/adm/man9/newlayer.9, revision 1.1

1.1     ! root        1: .TH NEWLAYER 9.2
        !             2: .CT 2 comm_term
        !             3: .SH NAME
        !             4: newlayer, dellayer, downback, lbitblt, lpoint, lrectf, lsegment, ltexture, upfront \- layer control and graphics
        !             5: .SH SYNOPSIS
        !             6: .B #include <jerq.h>
        !             7: .PP
        !             8: .B Layer *newlayer(r);
        !             9: .B Rectangle r;
        !            10: .PP
        !            11: .B void dellayer(l)
        !            12: .B Layer *l;
        !            13: .PP
        !            14: .B void lbitblt(sl, r, dl, p, f)
        !            15: .B "Layer *sl, *dl; Rectangle r; Point p; Code f;
        !            16: .PP
        !            17: .B void lpoint(l, p, f)
        !            18: .B "Layer *l; Point p; Code f;
        !            19: .PP
        !            20: .B void lrectf(l, r, f)
        !            21: .B "Layer *l; Rectangle r; Code f;
        !            22: .PP
        !            23: .B void segment(l, p, q, f)
        !            24: .B "Layer *l; Point p, q; Code f;
        !            25: .PP
        !            26: .B void ltexture(l, r, t, f)
        !            27: .B "Layer *l; Rectangle r; Texture *t; Code f;
        !            28: .PP
        !            29: .B void upfront(l)
        !            30: .B "Layer *l;
        !            31: .PP
        !            32: .B void downback(l)
        !            33: .B "Layer *l;
        !            34: .SH DESCRIPTION
        !            35: .I Newlayer
        !            36: creates a layer in Rectangle
        !            37: .I r
        !            38: in the physical display bitmap, and returns its address,
        !            39: or 0 on failure.
        !            40: .IR Newproc (9.2)
        !            41: explains how to attach a process to a layer.
        !            42: .PP
        !            43: .I Dellayer
        !            44: de-allocates a layer; the associated process must also
        !            45: be freed (see
        !            46: .IR newproc (9.2)).
        !            47: .PP
        !            48: .I Upfront
        !            49: and
        !            50: .I downback
        !            51: are the subroutines corresponding to the
        !            52: .IR mux (9.1)
        !            53: menu items
        !            54: .B Top
        !            55: and
        !            56: .BR Bottom .
        !            57: .PP
        !            58: The routines
        !            59: .IR lbitblt ,
        !            60: .IR lpoint ,
        !            61: .I lsegment
        !            62: and
        !            63: .IR ltexture
        !            64: are equivalent to their
        !            65: .IR bitblt (9.3)
        !            66: counterparts
        !            67: except that they never inhibit the mouse cursor,
        !            68: so they are mainly useful only for implementation
        !            69: of efficient composite graphics operations such
        !            70: as circle-drawing.
        !            71: Because of the duality of Bitmaps and Layers,
        !            72: arguments of either type may be passed freely
        !            73: to any of the graphics primitives.
        !            74: .SH SEE ALSO
        !            75: .IR bitblt (9.3), 
        !            76: .IR newproc (9.2)
        !            77: .br
        !            78: Rob Pike,
        !            79: .I
        !            80: Graphics in Overlapping Bitmap Layers,
        !            81: ACM Trans. on Graphics, April 1983.

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