--- /dev/null
+/* $XConsortium: miline.h /main/6 1996/08/12 21:51:09 dpw $ */
+
+/*
+
+Copyright (c) 1994 X Consortium
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+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
+X CONSORTIUM 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 X Consortium 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 X Consortium.
+
+*/
+
+#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 */
projects / rdpsrv / blobdiff