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b9a21c3c91c47e090316e28d759194e46628ed49vboxsyncdocumentation.
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b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * Public definitions used for configuring basic pixelization aspects
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * of the sample implementation line-drawing routines provided in
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * {mfb,mi,cfb*} at run-time.
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync#define OCTANT3 (1 << (XDECREASING|YDECREASING|YMAJOR))
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync#define XMAJOROCTANTS (OCTANT1 | OCTANT4 | OCTANT5 | OCTANT8)
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync#define DEFAULTZEROLINEBIAS (OCTANT2 | OCTANT3 | OCTANT4 | OCTANT5)
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * Devices can configure the rendering of routines in mi, mfb, and cfb*
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * by specifying a thin line bias to be applied to a particular screen
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * using the following function. The bias parameter is an OR'ing of
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * the appropriate OCTANT constants defined above to indicate which
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * octants to bias a line to prefer an axial step when the Bresenham
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * error term is exactly zero. The octants are mapped as follows:
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * \ 3 | 2 /
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * 4 \ | / 1
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * -----------
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * 5 / | \ 8
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * / 6 | 7 \
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * For more information, see "Ambiguities in Incremental Line Rastering,"
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * Jack E. Bresenham, IEEE CG&A, May 1987.
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync unsigned int /* bias */
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * Private definitions needed for drawing thin (zero width) lines
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync * Used by the mi, mfb, and all cfb* components.
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync else if ( (_x) >= (_pbox)->x2) (_result) |= OUT_RIGHT; \
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync else if ( (_y) >= (_pbox)->y2) (_result) |= OUT_BELOW;
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync#define MIOUTCODES(outcode, x, y, xmin, ymin, xmax, ymax) \
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync#define miGetZeroLineBias(_pScreen) ((unsigned long) (unsigned long*)\
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync dixLookupPrivate(&(_pScreen)->devPrivates, miZeroLineScreenKey))
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync#define CalcLineDeltas(_x1,_y1,_x2,_y2,_adx,_ady,_sx,_sy,_SX,_SY,_octant) \
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync#define SetYMajorOctant(_octant) ((_octant) |= YMAJOR)
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync#define IsXMajorOctant(_octant) (!((_octant) & YMAJOR))
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync#define IsYMajorOctant(_octant) ((_octant) & YMAJOR)
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync#define IsXDecreasingOctant(_octant) ((_octant) & XDECREASING)
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync#define IsYDecreasingOctant(_octant) ((_octant) & YDECREASING)
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int /*xmin*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int /*ymin*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int /*xmax*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int /*ymax*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int * /*new_x1*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int * /*new_y1*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int * /*new_x2*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int * /*new_y2*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync unsigned int /*adx*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync unsigned int /*ady*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int * /*pt1_clipped*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int * /*pt2_clipped*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int /*octant*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync unsigned int /*bias*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int /*oc1*/,
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync int /*oc2*/
b9a21c3c91c47e090316e28d759194e46628ed49vboxsync#endif /* MILINE_H */