mifillarc.c

远程桌面连接工具

/************************************************************

Copyright (c) 1989  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.

Author:  Bob Scheifler, MIT X Consortium

********************************************************/

/* $XConsortium: mifillarc.c,v 5.18 95/01/10 20:59:49 kaleb Exp $ */
/* $XFree86: xc/programs/Xserver/mi/mifillarc.c,v 3.2 1995/01/28 16:15:52 dawes Exp $ */

#include <math.h>
#include "X.h"
#include "Xprotostr.h"
#include "miscstruct.h"
#include "gcstruct.h"
#include "pixmapstr.h"
#include "mifpoly.h"
#include "mi.h"
#include "mifillarc.h"

#define QUADRANT (90 * 64)
#define HALFCIRCLE (180 * 64)
#define QUADRANT3 (270 * 64)

#ifndef M_PI
#define M_PI	3.14159265358979323846
#endif

#define Dsin(d)	sin((double)d*(M_PI/11520.0))
#define Dcos(d)	cos((double)d*(M_PI/11520.0))

void
miFillArcSetup(arc, info)
    register xArc *arc;
    register miFillArcRec *info;
{
    info->y = arc->height >> 1;
    info->dy = arc->height & 1;
    info->yorg = arc->y + info->y;
    info->dx = arc->width & 1;
    info->xorg = arc->x + (arc->width >> 1) + info->dx;
    info->dx = 1 - info->dx;
    if (arc->width == arc->height)
    {
	/* (2x - 2xorg)^2 = d^2 - (2y - 2yorg)^2 */
	/* even: xorg = yorg = 0   odd:  xorg = .5, yorg = -.5 */
	info->ym = 8;
	info->xm = 8;
	info->yk = info->y << 3;
	if (!info->dx)
	{
	    info->xk = 0;
	    info->e = -1;
	}
	else
	{
	    info->y++;
	    info->yk += 4;
	    info->xk = -4;
	    info->e = - (info->y << 3);
	}
    }
    else
    {
	/* h^2 * (2x - 2xorg)^2 = w^2 * h^2 - w^2 * (2y - 2yorg)^2 */
	/* even: xorg = yorg = 0   odd:  xorg = .5, yorg = -.5 */
	info->ym = (arc->width * arc->width) << 3;
	info->xm = (arc->height * arc->height) << 3;
	info->yk = info->y * info->ym;
	if (!info->dy)
	    info->yk -= info->ym >> 1;
	if (!info->dx)
	{
	    info->xk = 0;
	    info->e = - (info->xm >> 3);
	}
	else
	{
	    info->y++;
	    info->yk += info->ym;
	    info->xk = -(info->xm >> 1);
	    info->e = info->xk - info->yk;
	}
    }
}

void
miFillArcDSetup(arc, info)
    register xArc *arc;
    register miFillArcDRec *info;
{
    /* h^2 * (2x - 2xorg)^2 = w^2 * h^2 - w^2 * (2y - 2yorg)^2 */
    /* even: xorg = yorg = 0   odd:  xorg = .5, yorg = -.5 */
    info->y = arc->height >> 1;
    info->dy = arc->height & 1;
    info->yorg = arc->y + info->y;
    info->dx = arc->width & 1;
    info->xorg = arc->x + (arc->width >> 1) + info->dx;
    info->dx = 1 - info->dx;
    info->ym = ((double)arc->width) * (arc->width * 8);
    info->xm = ((double)arc->height) * (arc->height * 8);
    info->yk = info->y * info->ym;
    if (!info->dy)
	info->yk -= info->ym / 2.0;
    if (!info->dx)
    {
	info->xk = 0;
	info->e = - (info->xm / 8.0);
    }
    else
    {
	info->y++;
	info->yk += info->ym;
	info->xk = -info->xm / 2.0;
	info->e = info->xk - info->yk;
    }
}

static void
miGetArcEdge(arc, edge, k, top, left)
    register xArc *arc;
    register miSliceEdgePtr edge;
    int k;
    Bool top, left;
{
    register int xady, y;

    y = arc->height >> 1;
    if (!(arc->width & 1))
	y++;
    if (!top)
    {
	y = -y;
	if (arc->height & 1)
	    y--;
    }
    xady = k + y * edge->dx;
    if (xady <= 0)
	edge->x = - ((-xady) / edge->dy + 1);
    else
	edge->x = (xady - 1) / edge->dy;
    edge->e = xady - edge->x * edge->dy;
    if ((top && (edge->dx < 0)) || (!top && (edge->dx > 0)))
	edge->e = edge->dy - edge->e + 1;
    if (left)
	edge->x++;
    edge->x += arc->x + (arc->width >> 1);
    if (edge->dx > 0)
    {
	edge->deltax = 1;
	edge->stepx = edge->dx / edge->dy;
	edge->dx = edge->dx % edge->dy;
    }
    else
    {
	edge->deltax = -1;
	edge->stepx = - ((-edge->dx) / edge->dy);
	edge->dx = (-edge->dx) % edge->dy;
    }
    if (!top)
    {
	edge->deltax = -edge->deltax;
	edge->stepx = -edge->stepx;
    }
}

void
miEllipseAngleToSlope (angle, width, height, dxp, dyp, d_dxp, d_dyp)
    int	    angle;
    int	    width;
    int	    height;
    int	    *dxp;
    int	    *dyp;
    double  *d_dxp;
    double  *d_dyp;
{
    int	    dx, dy;
    double  d_dx, d_dy, scale;
    Bool    negative_dx, negative_dy;

    switch (angle) {
    case 0:
	*dxp = -1;
	*dyp = 0;
	if (d_dxp) {
	    *d_dxp = width / 2.0;
	    *d_dyp = 0;
	}
	break;
    case QUADRANT:
	*dxp = 0;
	*dyp = 1;
	if (d_dxp) {
	    *d_dxp = 0;
	    *d_dyp = - height / 2.0;
	}
	break;
    case HALFCIRCLE:
	*dxp = 1;
	*dyp = 0;
	if (d_dxp) {
	    *d_dxp = - width / 2.0;
	    *d_dyp = 0;
	}
	break;
    case QUADRANT3:
	*dxp = 0;
	*dyp = -1;
	if (d_dxp) {
	    *d_dxp = 0;
	    *d_dyp = height / 2.0;
	}
	break;
    default:
	d_dx = Dcos(angle) * width;
	d_dy = Dsin(angle) * height;
	if (d_dxp) {
	    *d_dxp = d_dx / 2.0;
	    *d_dyp = - d_dy / 2.0;
	}
	negative_dx = FALSE;
	if (d_dx < 0.0)
	{
	    d_dx = -d_dx;
	    negative_dx = TRUE;
	}
	negative_dy = FALSE;
	if (d_dy < 0.0)
	{
	    d_dy = -d_dy;
	    negative_dy = TRUE;
	}
	scale = d_dx;
	if (d_dy > d_dx)
	    scale = d_dy;
	dx = floor ((d_dx * 32768) / scale + 0.5);
	if (negative_dx)
	    dx = -dx;
	*dxp = dx;
	dy = floor ((d_dy * 32768) / scale + 0.5);
	if (negative_dy)
	    dy = -dy;
	*dyp = dy;
	break;
    }
}

static void
miGetPieEdge(arc, angle, edge, top, left)
    register xArc *arc;
    register int angle;
    register miSliceEdgePtr edge;
    Bool top, left;
{
    register int k, signdx, signdy;
    int	dx, dy;

    miEllipseAngleToSlope (angle, arc->width, arc->height, &dx, &dy, 0, 0);

    if (dy == 0)
    {
	edge->x = left ? -65536 : 65536;
	edge->stepx = 0;
	edge->e = 0;
	edge->dx = -1;
	return;
    }
    if (dx == 0)
    {
	edge->x = arc->x + (arc->width >> 1);
	if (left && (arc->width & 1))
	    edge->x++;
	else if (!left && !(arc->width & 1))
	    edge->x--;
	edge->stepx = 0;
	edge->e = 0;
	edge->dx = -1;
	return;
    }
    if (dy < 0) {
	dx = -dx;
	dy = -dy;
    }
    k = (arc->height & 1) ? dx : 0;
    if (arc->width & 1)
	k += dy;
    edge->dx = dx << 1;
    edge->dy = dy << 1;
    miGetArcEdge(arc, edge, k, top, left);
}

void
miFillArcSliceSetup(arc, slice, pGC)
    register xArc *arc;
    register miArcSliceRec *slice;
    GCPtr pGC;
{
    register int angle1, angle2;

    angle1 = arc->angle1;
    if (arc->angle2 < 0)
    {
	angle2 = angle1;
	angle1 += arc->angle2;
    }
    else
	angle2 = angle1 + arc->angle2;
    while (angle1 < 0)
	angle1 += FULLCIRCLE;
    while (angle1 >= FULLCIRCLE)
	angle1 -= FULLCIRCLE;
    while (angle2 < 0)
	angle2 += FULLCIRCLE;
    while (angle2 >= FULLCIRCLE)
	angle2 -= FULLCIRCLE;
    slice->min_top_y = 0;
    slice->max_top_y = arc->height >> 1;
    slice->min_bot_y = 1 - (arc->height & 1);
    slice->max_bot_y = slice->max_top_y - 1;
    slice->flip_top = FALSE;
    slice->flip_bot = FALSE;
    if (pGC->arcMode == ArcPieSlice)
    {
	slice->edge1_top = (angle1 < HALFCIRCLE);
	slice->edge2_top = (angle2 <= HALFCIRCLE);
	if ((angle2 == 0) || (angle1 == HALFCIRCLE))
	{
	    if (angle2 ? slice->edge2_top : slice->edge1_top)
		slice->min_top_y = slice->min_bot_y;
	    else
		slice->min_top_y = arc->height;
	    slice->min_bot_y = 0;
	}
	else if ((angle1 == 0) || (angle2 == HALFCIRCLE))
	{
	    slice->min_top_y = slice->min_bot_y;
	    if (angle1 ? slice->edge1_top : slice->edge2_top)
		slice->min_bot_y = arc->height;
	    else
		slice->min_bot_y = 0;
	}
	else if (slice->edge1_top == slice->edge2_top)
	{
	    if (angle2 < angle1)
	    {
		slice->flip_top = slice->edge1_top;
		slice->flip_bot = !slice->edge1_top;
	    }
	    else if (slice->edge1_top)
	    {
		slice->min_top_y = 1;
		slice->min_bot_y = arc->height;
	    }
	    else
	    {
		slice->min_bot_y = 0;
		slice->min_top_y = arc->height;
	    }
	}
	miGetPieEdge(arc, angle1, &slice->edge1,
		     slice->edge1_top, !slice->edge1_top);
	miGetPieEdge(arc, angle2, &slice->edge2,
		     slice->edge2_top, slice->edge2_top);
    }
    else
    {
	double w2, h2, x1, y1, x2, y2, dx, dy, scale;
	int signdx, signdy, y, k;
	Bool isInt1 = TRUE, isInt2 = TRUE;

	w2 = (double)arc->width / 2.0;
	h2 = (double)arc->height / 2.0;
	if ((angle1 == 0) || (angle1 == HALFCIRCLE))
	{
	    x1 = angle1 ? -w2 : w2;
	    y1 = 0.0;
	}
	else if ((angle1 == QUADRANT) || (angle1 == QUADRANT3))
	{
	    x1 = 0.0;
	    y1 = (angle1 == QUADRANT) ? h2 : -h2;
	}
	else
	{
	    isInt1 = FALSE;