mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-11-10 19:00:08 +00:00
178 lines
4.9 KiB
C
178 lines
4.9 KiB
C
/* $TOG: miline.h /main/7 1998/02/09 14:47:30 kaleb $ */
|
|
|
|
/*
|
|
|
|
Copyright 1994, 1998 The Open Group
|
|
|
|
All Rights Reserved.
|
|
|
|
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.
|
|
|
|
*/
|
|
/* $XFree86: xc/programs/Xserver/mi/miline.h,v 1.4 1999/10/13 22:33:11 dawes Exp $ */
|
|
|
|
#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.
|
|
*/
|
|
|
|
#if 0
|
|
extern void miSetZeroLineBias(
|
|
#if NeedFunctionPrototypes
|
|
ScreenPtr /* pScreen */,
|
|
unsigned int /* bias */
|
|
#endif
|
|
);
|
|
#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 MIOUTCODES(outcode, x, y, xmin, ymin, xmax, ymax) \
|
|
{\
|
|
if (x < xmin) outcode |= OUT_LEFT;\
|
|
if (x > xmax) outcode |= OUT_RIGHT;\
|
|
if (y < ymin) outcode |= OUT_ABOVE;\
|
|
if (y > ymax) outcode |= OUT_BELOW;\
|
|
}
|
|
|
|
#define SWAPINT(i, j) \
|
|
{ register int _t = i; i = j; j = _t; }
|
|
|
|
#define SWAPPT(i, j) \
|
|
{ GdkPoint _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;\
|
|
}
|
|
|
|
#if 0
|
|
#define miGetZeroLineBias(_pScreen) \
|
|
((miZeroLineScreenIndex < 0) ? \
|
|
0 : ((_pScreen)->devPrivates[miZeroLineScreenIndex].uval))
|
|
#endif
|
|
#define miGetZeroLineBias() DEFAULTZEROLINEBIAS
|
|
|
|
#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 */
|