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Annotation of researchv10no/cmd/view2d/Notes_cv, revision 1.1

1.1     ! root        1: ****************
        !             2: * frame buffer *     swift  /dev/cv0
        !             3: ****************
        !             4: 
        !             5: coordinate system:
        !             6:   lower left of screen = (0,0),  upper right = (511,511)
        !             7: 
        !             8: cvinit(1);     at start of each program.      0 for warm start.
        !             9: 
        !            10: cvflush();   flush i/o buffer.
        !            11: 
        !            12: image(data,x0,y0,x1,y1,bank)  write 8-bit image
        !            13:   data   char[x1-x0+1][y1-y0+1]
        !            14:     stored as if a Fortran array with d(i,j) at x=i, y=j,
        !            15:        (scan rows left to right, starting with bottom row)
        !            16:     maximum image size is 128^2.
        !            17:   x0,y0,x1,y1  coordinates of lower left and upper right of window
        !            18:   bank  3-bit value  (red,green,blue)  indicating banks to be written
        !            19: 
        !            20: lutrte(bank)  set which bank drives the display
        !            21:   bank  0x0   each bank indexes its own color table
        !            22:         0x7E  red drives all
        !            23:         0x75  green drives all
        !            24:         0x53  blue drives all
        !            25: 
        !            26: cvmap(map,maxi,zero)
        !            27:   char *map;   /* string describing kind of map */
        !            28:   int maxi;    /* indices from 0 through maxi */
        !            29:   int zero;    /* currently unused */
        !            30:  map=ffile   read triples from file
        !            31:      r       blue-to-red  (for 8 bit in; gamma corrected)
        !            32:      s       spectrum     (for 8 bit in; gamma corrected)
        !            33:      n       normal map (for 24 bin in; not gamma corrected)
        !            34:      g       normal map (for 24 bin in; gamma corrected)
        !            35:      i       like g, but inverse video
        !            36: 
        !            37: cvload(n,x,y);   load coordinate register n.     0<=n<=63
        !            38:    creg 4  coordinates of center of screen    (useful for panning)
        !            39: zoom(fact)
        !            40:   fact = 1, 2, 4, or 8    (to see 512, 256, 128, or 64 -size images)
        !            41: 
        !            42: cvvalue(r,g,b)    set current color
        !            43: 
        !            44: cvflood()     erase screen
        !            45:  

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