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Diffstat (limited to 'mi/miline.h')
| -rw-r--r-- | mi/miline.h | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/mi/miline.h b/mi/miline.h new file mode 100644 index 000000000..329dea51e --- /dev/null +++ b/mi/miline.h @@ -0,0 +1,167 @@ +/* $Xorg: miline.h,v 1.4 2001/02/09 02:05:21 xorgcvs Exp $ */ + +/* + +Copyright 1994, 1998 The Open Group + +Permission to use, copy, modify, distribute, and sell this software and its +documentation for any purpose is hereby granted without fee, provided that +the above copyright notice appear in all copies and that both that +copyright notice and this permission notice appear in supporting +documentation. + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN +AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +Except as contained in this notice, the name of The Open Group shall not be +used in advertising or otherwise to promote the sale, use or other dealings +in this Software without prior written authorization from The Open Group. + +*/ + +#ifndef MILINE_H + +/* + * Public definitions used for configuring basic pixelization aspects + * of the sample implementation line-drawing routines provided in + * {mfb,mi,cfb*} at run-time. + */ + +#define XDECREASING 4 +#define YDECREASING 2 +#define YMAJOR 1 + +#define OCTANT1 (1 << (YDECREASING)) +#define OCTANT2 (1 << (YDECREASING|YMAJOR)) +#define OCTANT3 (1 << (XDECREASING|YDECREASING|YMAJOR)) +#define OCTANT4 (1 << (XDECREASING|YDECREASING)) +#define OCTANT5 (1 << (XDECREASING)) +#define OCTANT6 (1 << (XDECREASING|YMAJOR)) +#define OCTANT7 (1 << (YMAJOR)) +#define OCTANT8 (1 << (0)) + +#define XMAJOROCTANTS (OCTANT1 | OCTANT4 | OCTANT5 | OCTANT8) + +#define DEFAULTZEROLINEBIAS (OCTANT2 | OCTANT3 | OCTANT4 | OCTANT5) + +/* + * Devices can configure the rendering of routines in mi, mfb, and cfb* + * by specifying a thin line bias to be applied to a particular screen + * using the following function. The bias parameter is an OR'ing of + * the appropriate OCTANT constants defined above to indicate which + * octants to bias a line to prefer an axial step when the Bresenham + * error term is exactly zero. The octants are mapped as follows: + * + * \ | / + * \ 3 | 2 / + * \ | / + * 4 \ | / 1 + * \|/ + * ----------- + * /|\ + * 5 / | \ 8 + * / | \ + * / 6 | 7 \ + * / | \ + * + * For more information, see "Ambiguities in Incremental Line Rastering," + * Jack E. Bresenham, IEEE CG&A, May 1987. + */ + +extern void miSetZeroLineBias( +#if NeedFunctionPrototypes + ScreenPtr /* pScreen */, + unsigned int /* bias */ +#endif +); + +/* + * Private definitions needed for drawing thin (zero width) lines + * Used by the mi, mfb, and all cfb* components. + */ + +#define X_AXIS 0 +#define Y_AXIS 1 + +#define OUT_LEFT 0x08 +#define OUT_RIGHT 0x04 +#define OUT_ABOVE 0x02 +#define OUT_BELOW 0x01 + +#define OUTCODES(_result, _x, _y, _pbox) \ + if ( (_x) < (_pbox)->x1) (_result) |= OUT_LEFT; \ + else if ( (_x) >= (_pbox)->x2) (_result) |= OUT_RIGHT; \ + if ( (_y) < (_pbox)->y1) (_result) |= OUT_ABOVE; \ + else if ( (_y) >= (_pbox)->y2) (_result) |= OUT_BELOW; + +#define SWAPINT(i, j) \ +{ register int _t = i; i = j; j = _t; } + +#define SWAPPT(i, j) \ +{ DDXPointRec _t; _t = i; i = j; j = _t; } + +#define SWAPINT_PAIR(x1, y1, x2, y2)\ +{ int t = x1; x1 = x2; x2 = t;\ + t = y1; y1 = y2; y2 = t;\ +} + +#define miGetZeroLineBias(_pScreen) \ + ((miZeroLineScreenIndex < 0) ? \ + 0 : ((_pScreen)->devPrivates[miZeroLineScreenIndex].uval)) + +#define CalcLineDeltas(_x1,_y1,_x2,_y2,_adx,_ady,_sx,_sy,_SX,_SY,_octant) \ + (_octant) = 0; \ + (_sx) = (_SX); \ + if (((_adx) = (_x2) - (_x1)) < 0) { \ + (_adx) = -(_adx); \ + (_sx = -(_sx)); \ + (_octant) |= XDECREASING; \ + } \ + (_sy) = (_SY); \ + if (((_ady) = (_y2) - (_y1)) < 0) { \ + (_ady) = -(_ady); \ + (_sy = -(_sy)); \ + (_octant) |= YDECREASING; \ + } + +#define SetYMajorOctant(_octant) ((_octant) |= YMAJOR) + +#define FIXUP_ERROR(_e, _octant, _bias) \ + (_e) -= (((_bias) >> (_octant)) & 1) + +#define IsXMajorOctant(_octant) (!((_octant) & YMAJOR)) +#define IsYMajorOctant(_octant) ((_octant) & YMAJOR) +#define IsXDecreasingOctant(_octant) ((_octant) & XDECREASING) +#define IsYDecreasingOctant(_octant) ((_octant) & YDECREASING) + +extern int miZeroLineScreenIndex; + +extern int miZeroClipLine( +#if NeedFunctionPrototypes + int /*xmin*/, + int /*ymin*/, + int /*xmax*/, + int /*ymax*/, + int * /*new_x1*/, + int * /*new_y1*/, + int * /*new_x2*/, + int * /*new_y2*/, + unsigned int /*adx*/, + unsigned int /*ady*/, + int * /*pt1_clipped*/, + int * /*pt2_clipped*/, + int /*octant*/, + unsigned int /*bias*/, + int /*oc1*/, + int /*oc2*/ +#endif +); + +#endif /* MILINE_H */ |