173 lines
5.0 KiB
C
173 lines
5.0 KiB
C
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/*
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Copyright 1994, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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*/
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#ifndef MILINE_H
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#include "screenint.h"
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/*
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* Public definitions used for configuring basic pixelization aspects
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* of the sample implementation line-drawing routines provided in
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* {mfb,mi,cfb*} at run-time.
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*/
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#define XDECREASING 4
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#define YDECREASING 2
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#define YMAJOR 1
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#define OCTANT1 (1 << (YDECREASING))
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#define OCTANT2 (1 << (YDECREASING|YMAJOR))
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#define OCTANT3 (1 << (XDECREASING|YDECREASING|YMAJOR))
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#define OCTANT4 (1 << (XDECREASING|YDECREASING))
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#define OCTANT5 (1 << (XDECREASING))
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#define OCTANT6 (1 << (XDECREASING|YMAJOR))
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#define OCTANT7 (1 << (YMAJOR))
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#define OCTANT8 (1 << (0))
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#define XMAJOROCTANTS (OCTANT1 | OCTANT4 | OCTANT5 | OCTANT8)
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#define DEFAULTZEROLINEBIAS (OCTANT2 | OCTANT3 | OCTANT4 | OCTANT5)
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/*
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* Devices can configure the rendering of routines in mi, mfb, and cfb*
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* by specifying a thin line bias to be applied to a particular screen
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* using the following function. The bias parameter is an OR'ing of
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* the appropriate OCTANT constants defined above to indicate which
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* octants to bias a line to prefer an axial step when the Bresenham
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* error term is exactly zero. The octants are mapped as follows:
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*
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* \ | /
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* \ 3 | 2 /
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* \ | /
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* 4 \ | / 1
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* \|/
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* -----------
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* /|\
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* 5 / | \ 8
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* / | \
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* / 6 | 7 \
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* / | \
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*
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* For more information, see "Ambiguities in Incremental Line Rastering,"
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* Jack E. Bresenham, IEEE CG&A, May 1987.
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*/
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extern void miSetZeroLineBias(
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ScreenPtr /* pScreen */,
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unsigned int /* bias */
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);
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/*
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* Private definitions needed for drawing thin (zero width) lines
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* Used by the mi, mfb, and all cfb* components.
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*/
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#define X_AXIS 0
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#define Y_AXIS 1
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#define OUT_LEFT 0x08
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#define OUT_RIGHT 0x04
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#define OUT_ABOVE 0x02
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#define OUT_BELOW 0x01
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#define OUTCODES(_result, _x, _y, _pbox) \
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if ( (_x) < (_pbox)->x1) (_result) |= OUT_LEFT; \
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else if ( (_x) >= (_pbox)->x2) (_result) |= OUT_RIGHT; \
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if ( (_y) < (_pbox)->y1) (_result) |= OUT_ABOVE; \
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else if ( (_y) >= (_pbox)->y2) (_result) |= OUT_BELOW;
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#define MIOUTCODES(outcode, x, y, xmin, ymin, xmax, ymax) \
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{\
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if (x < xmin) outcode |= OUT_LEFT;\
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if (x > xmax) outcode |= OUT_RIGHT;\
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if (y < ymin) outcode |= OUT_ABOVE;\
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if (y > ymax) outcode |= OUT_BELOW;\
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}
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#define SWAPINT(i, j) \
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{ int _t = i; i = j; j = _t; }
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#define SWAPPT(i, j) \
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{ DDXPointRec _t; _t = i; i = j; j = _t; }
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#define SWAPINT_PAIR(x1, y1, x2, y2)\
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{ int t = x1; x1 = x2; x2 = t;\
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t = y1; y1 = y2; y2 = t;\
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}
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#define miGetZeroLineBias(_pScreen) \
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((miZeroLineScreenIndex < 0) ? \
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0 : ((_pScreen)->devPrivates[miZeroLineScreenIndex].uval))
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#define CalcLineDeltas(_x1,_y1,_x2,_y2,_adx,_ady,_sx,_sy,_SX,_SY,_octant) \
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(_octant) = 0; \
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(_sx) = (_SX); \
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if (((_adx) = (_x2) - (_x1)) < 0) { \
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(_adx) = -(_adx); \
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(_sx = -(_sx)); \
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(_octant) |= XDECREASING; \
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} \
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(_sy) = (_SY); \
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if (((_ady) = (_y2) - (_y1)) < 0) { \
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(_ady) = -(_ady); \
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(_sy = -(_sy)); \
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(_octant) |= YDECREASING; \
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}
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#define SetYMajorOctant(_octant) ((_octant) |= YMAJOR)
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#define FIXUP_ERROR(_e, _octant, _bias) \
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(_e) -= (((_bias) >> (_octant)) & 1)
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#define IsXMajorOctant(_octant) (!((_octant) & YMAJOR))
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#define IsYMajorOctant(_octant) ((_octant) & YMAJOR)
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#define IsXDecreasingOctant(_octant) ((_octant) & XDECREASING)
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#define IsYDecreasingOctant(_octant) ((_octant) & YDECREASING)
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extern int miZeroLineScreenIndex;
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extern int miZeroClipLine(
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int /*xmin*/,
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int /*ymin*/,
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int /*xmax*/,
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int /*ymax*/,
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int * /*new_x1*/,
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int * /*new_y1*/,
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int * /*new_x2*/,
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int * /*new_y2*/,
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unsigned int /*adx*/,
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unsigned int /*ady*/,
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int * /*pt1_clipped*/,
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int * /*pt2_clipped*/,
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int /*octant*/,
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unsigned int /*bias*/,
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int /*oc1*/,
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int /*oc2*/
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);
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#endif /* MILINE_H */
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