miline.h revision b9a21c3c91c47e090316e28d759194e46628ed49
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart PoetteringCopyright 1994, 1998 The Open Group
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6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering * Public definitions used for configuring basic pixelization aspects
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering * of the sample implementation line-drawing routines provided in
e48fdd84432bbf9c2ecc339183258c7c33116032Lennart Poettering * {mfb,mi,cfb*} at run-time.
6db615c17ee7a434f9e0c40d67a1f833d8f3cc9dLennart Poettering#define OCTANT2 (1 << (YDECREASING|YMAJOR))
6db615c17ee7a434f9e0c40d67a1f833d8f3cc9dLennart Poettering#define OCTANT3 (1 << (XDECREASING|YDECREASING|YMAJOR))
9f103625b145a397e67c3714766775b615c8b587Tobias Hunger#define OCTANT4 (1 << (XDECREASING|YDECREASING))
5607d856b8606ba75446a07ab5e9048753e1d7a6Zbigniew Jędrzejewski-Szmek#define XMAJOROCTANTS (OCTANT1 | OCTANT4 | OCTANT5 | OCTANT8)
5607d856b8606ba75446a07ab5e9048753e1d7a6Zbigniew Jędrzejewski-Szmek#define DEFAULTZEROLINEBIAS (OCTANT2 | OCTANT3 | OCTANT4 | OCTANT5)
7fd1b19bc9e9f5574f2877936b8ac267c7706947Harald Hoyer * Devices can configure the rendering of routines in mi, mfb, and cfb*
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering * by specifying a thin line bias to be applied to a particular screen
e0952d9d021234e79f3a70f33a9e5d201872a417Zbigniew Jędrzejewski-Szmek * using the following function. The bias parameter is an OR'ing of
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering * the appropriate OCTANT constants defined above to indicate which
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering * octants to bias a line to prefer an axial step when the Bresenham
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering * error term is exactly zero. The octants are mapped as follows:
e0952d9d021234e79f3a70f33a9e5d201872a417Zbigniew Jędrzejewski-Szmek * For more information, see "Ambiguities in Incremental Line Rastering,"
e0952d9d021234e79f3a70f33a9e5d201872a417Zbigniew Jędrzejewski-Szmek * Jack E. Bresenham, IEEE CG&A, May 1987.
e0952d9d021234e79f3a70f33a9e5d201872a417Zbigniew Jędrzejewski-Szmekextern _X_EXPORT void miSetZeroLineBias(
e0952d9d021234e79f3a70f33a9e5d201872a417Zbigniew Jędrzejewski-Szmek unsigned int /* bias */
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering * Private definitions needed for drawing thin (zero width) lines
d0aa9ce51915f6f7448adfeb4be0f46cc1356124Zbigniew Jędrzejewski-Szmek * Used by the mi, mfb, and all cfb* components.
56f64d95763a799ba4475daf44d8e9f72a1bd474Michal Schmidt if ( (_x) < (_pbox)->x1) (_result) |= OUT_LEFT; \
d0aa9ce51915f6f7448adfeb4be0f46cc1356124Zbigniew Jędrzejewski-Szmek else if ( (_x) >= (_pbox)->x2) (_result) |= OUT_RIGHT; \
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering if ( (_y) < (_pbox)->y1) (_result) |= OUT_ABOVE; \
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering else if ( (_y) >= (_pbox)->y2) (_result) |= OUT_BELOW;
64347fc2b983f33e7efb0fd2bb44e133fb9f30f4Tom Gundersen#define MIOUTCODES(outcode, x, y, xmin, ymin, xmax, ymax) \
4f52d3fe2da7c3449b7fbfaa7c64a83354d3b56cZbigniew Jędrzejewski-Szmek{ DDXPointRec _t; _t = i; i = j; j = _t; }
e0952d9d021234e79f3a70f33a9e5d201872a417Zbigniew Jędrzejewski-Szmek#define SWAPINT_PAIR(x1, y1, x2, y2)\
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering#define miGetZeroLineBias(_pScreen) ((unsigned long) (unsigned long*)\
b3208b662948b51ff34e7b7752e28ec7a48708aeZbigniew Jędrzejewski-Szmek dixLookupPrivate(&(_pScreen)->devPrivates, miZeroLineScreenKey))
b3208b662948b51ff34e7b7752e28ec7a48708aeZbigniew Jędrzejewski-Szmek#define CalcLineDeltas(_x1,_y1,_x2,_y2,_adx,_ady,_sx,_sy,_SX,_SY,_octant) \
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering#define SetYMajorOctant(_octant) ((_octant) |= YMAJOR)
b9f111b93f9f442f00266f338b14f25ca8685352Zbigniew Jędrzejewski-Szmek#define IsXMajorOctant(_octant) (!((_octant) & YMAJOR))
b9f111b93f9f442f00266f338b14f25ca8685352Zbigniew Jędrzejewski-Szmek#define IsYMajorOctant(_octant) ((_octant) & YMAJOR)
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering#define IsXDecreasingOctant(_octant) ((_octant) & XDECREASING)
6b1dc2bd3cdb3bd932b0692be636ddd2879edb92Lennart Poettering#define IsYDecreasingOctant(_octant) ((_octant) & YDECREASING)
3d22d1ab57bf44c92e4d9ca95d9728105dd3fb0dTom Gundersenextern _X_EXPORT DevPrivateKey miZeroLineScreenKey;
b9f111b93f9f442f00266f338b14f25ca8685352Zbigniew Jędrzejewski-Szmekextern _X_EXPORT int miZeroClipLine(
3d22d1ab57bf44c92e4d9ca95d9728105dd3fb0dTom Gundersen int /*ymin*/,
3d22d1ab57bf44c92e4d9ca95d9728105dd3fb0dTom Gundersen int /*xmax*/,
e8d2f6cde0af86eece9118718ad0a8a19e1cffecLennart Poettering int * /*new_x1*/,
e8d2f6cde0af86eece9118718ad0a8a19e1cffecLennart Poettering int * /*new_y1*/,
6db615c17ee7a434f9e0c40d67a1f833d8f3cc9dLennart Poettering int * /*new_x2*/,
e8d2f6cde0af86eece9118718ad0a8a19e1cffecLennart Poettering int * /*new_y2*/,
e8d2f6cde0af86eece9118718ad0a8a19e1cffecLennart Poettering unsigned int /*adx*/,
e8d2f6cde0af86eece9118718ad0a8a19e1cffecLennart Poettering unsigned int /*ady*/,
e8d2f6cde0af86eece9118718ad0a8a19e1cffecLennart Poettering int * /*pt1_clipped*/,
e8d2f6cde0af86eece9118718ad0a8a19e1cffecLennart Poettering int * /*pt2_clipped*/,
e8d2f6cde0af86eece9118718ad0a8a19e1cffecLennart Poettering int /*octant*/,
e8d2f6cde0af86eece9118718ad0a8a19e1cffecLennart Poettering unsigned int /*bias*/,
2968644080fd103062f070e83edd620e0a58c44dZbigniew Jędrzejewski-Szmek#endif /* MILINE_H */