path: root/src/lib/XSpadFill.c

/*
    Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
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    Copyright (C) 2007-2010, Gabriel Dos Reis.
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*/

/*
  This file contains the routines needed in order to dither using the
  spadcolors. The routines will have names such as XSpadFill, ... The user
  simply gives the normal arguments as with the corresponding XFill routine,
  with two additional arguments which choose the shade and the hue.
  
  The file will maintain twoGC's: stippleGC - will be used when stippling the
  backgrounds. solidGC - will be used when the background should be solid
  
  The user should call XSpadInit to get everthing going. This routine has the
  job of Initializing the dithering routines, and getting the colors all
  into place.

 */


#include <stdio.h>
#include <stdlib.h>

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xos.h>
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>

#include "openaxiom-c-macros.h"
#include "spadcolors.h"
#include "XSpadFill.h"
#include "XShade.h"
#include "XDither.h"

extern unsigned long *spadColors;
static GC  stippleGC, solidGC;
Colormap cmap;
int SpadFillInit = 0;
long white, black;
int max_spad_shades;
extern Display *dsply;

extern int totalHues;
extern int totalDithered;
extern int totalSolid;
extern int totalShades;
extern int totalColors;
extern int maxGreyShade;

int
XInitSpadFill(Display *dsply, int scr, Colormap * mapOfColors, int * hues,
              int *solid, int * dithered, int * shades)
{
    int maxDither;
    XColor BlackColor, WhiteColor;
    XColor retColor;
    int maxSolid;

    SpadFillInit = 1;


    /*
     * First thing I should do is get the GC's
     */
    stippleGC = XCreateGC(dsply, RootWindow(dsply, scr), 0, NULL);
    solidGC = XCreateGC(dsply, RootWindow(dsply, scr), 0, NULL);
    XSetArcMode(dsply, solidGC, ArcPieSlice);
    XSetArcMode(dsply, stippleGC, ArcPieSlice);


    cmap = DefaultColormap(dsply, scr);
    *mapOfColors = cmap;
    XAllocNamedColor(dsply, cmap, "Black", &BlackColor, &retColor);
    XAllocNamedColor(dsply, cmap, "White", &WhiteColor, &retColor);
    black = BlackColor.pixel;
    white = WhiteColor.pixel;

    /*
     * Now I check to see if I am on a monochrome display. If so then I
     * simply set totalHues to be one, and total Shades to be 2. I also have
     * to allocate balck and white colors. This I put into the first two
     * memory locations of spadcolors.
     *
     * was      if(DisplayPlanes(dsply, scr) < 2)  changed temporarily to < 8
     * because of problems with screens with 4 planes . Now if we don't have
     * 8 planes to play with  we switch to monochrome
     */

    if (DisplayPlanes(dsply, scr) < 8) {
        *dithered = totalDithered = maxGreyShade = XInitShades(dsply, scr);
        maxDither = *dithered - 1;
        spadColors = (unsigned long *) malloc(2 * sizeof(unsigned long));
        spadColors[0] = BlackColor.pixel;
        spadColors[1] = WhiteColor.pixel;
        *hues = totalHues = 1;
        *solid = totalSolid = 2;
        *shades = totalColors = totalShades = totalDithered;
        return (totalColors);
    }

    /*
     * Now I have to get all the spad colors as every good spad program
     * should Now I should initialize the dithering routines
     */

    *dithered = totalDithered =
        XInitDither(dsply, scr, stippleGC, black, white);
    maxDither = *dithered - 1;

    if ((maxSolid = makeColors(dsply, scr, &cmap, &spadColors, &totalSolid)) > 0) {
        *solid = totalSolid + 2;
        *hues = totalHues = maxSolid / totalSolid;
        *shades = totalShades = (totalSolid + 1) * (totalDithered - 1) + 1;
        totalColors = totalHues * totalShades;
        return (totalColors);
    }
    else {

        /*
         * makeColors managed to fail -- switch to mono
         */
        *dithered = totalDithered = maxGreyShade = XInitShades(dsply, scr);
        maxDither = *dithered - 1;
        spadColors = (unsigned long *) malloc(2 * sizeof(unsigned long));
        spadColors[0] = BlackColor.pixel;
        spadColors[1] = WhiteColor.pixel;
        *hues = totalHues = 1;
        *solid = totalSolid = 2;
        *shades = totalColors = totalShades = totalDithered;
        return (totalColors);
    }
}


void 
XSpadFillSetArcMode(Display *dsply, int mode)
{
    XSetArcMode(dsply, solidGC, mode);
    XSetArcMode(dsply, stippleGC, mode);
}

GC
SpadFillGC(Display *dsply,int  hue, int theshade, const char* fill_routine)
{
    int dither;
    int color;


    if (!SpadFillInit) {
        fprintf(stderr, "Tried to use SpadFillGC before calling XInitSpadFill\n");
        exit(0);
    }

    if (theshade >= totalShades) {
        fprintf(stderr, "Shade %d out of range\n",theshade);
        exit(-1);
    }
    if (hue >= totalHues) {
        fprintf(stderr, "Error Hue %d is out of range\n",hue);
        exit(-1);
    }
    dither = ((theshade) % (totalDithered - 1));
    if (dither != 0) {
        XChangeDither(dsply, stippleGC, dither);
        if (theshade < totalDithered) {    /* Dither to black */
            color = totalSolid * hue;
            XSetForeground(dsply, stippleGC, black);
            XSetBackground(dsply, stippleGC, spadColors[color]);
        }
        else if (theshade > (totalShades - totalDithered)) {       /* Dither to white */
            color = ((theshade) / (totalDithered - 1)) + totalSolid * hue - 1;
            XSetForeground(dsply, stippleGC, spadColors[color]);
            XSetBackground(dsply, stippleGC, white);
        }
        else {
            color = ((theshade) / (totalDithered - 1)) + totalSolid * hue - 1;
            XSetForeground(dsply, stippleGC, spadColors[color]);
            XSetBackground(dsply, stippleGC, spadColors[color + 1]);
        }
        return (stippleGC);
    }
    else {
        if (theshade == 0)
            XSetForeground(dsply, solidGC, black);
        else if (theshade == (totalShades - 1))
            XSetForeground(dsply, solidGC, white);
        else {
            color = ((theshade) / (totalDithered - 1)) + totalSolid * hue - 1;
            XSetForeground(dsply, solidGC, spadColors[color]);
        }
        return (solidGC);
    }

}

unsigned long
XSolidColor(int hue, int theshade)
{
    if (hue >= totalHues)
        return -1;
    if (theshade >= totalSolid)
        return -1;
    return (spadColors[hue * (totalSolid) + theshade]);
}

void 
XSpadFillRectangle(Display *dsply, Drawable drawable, int x, int y, 
                   unsigned int width, unsigned int height, 
                   int hue, int theshade)
{

    XFillRectangle(dsply, drawable,
                   SpadFillGC(dsply, hue, theshade, "XSpadFillRectangle"),
                   x, y, width, height);

}


void
XSpadFillRectangles(Display *dsply, Drawable drawable, 
                    XRectangle * rectangles, int nrectangles,
                    int hue, int theshade)
{


    XFillRectangles(dsply, drawable,
                        SpadFillGC(dsply, hue, theshade, "XSpadFillRectangle"),
                           rectangles, nrectangles);

}


void
XSpadFillPolygon(Display *dsply, Drawable drawable, XPoint * points, 
                 int npoints, int shape, int mode, int hue, int theshade)
{
    XFillPolygon(dsply, drawable,
                        SpadFillGC(dsply, hue, theshade, "XSpadFillRectangle"),
                        points, npoints, shape, mode);

}

void
XSpadFillArc(Display *dsply, Drawable drawable, int x, int y, 
             unsigned int width, unsigned int height, 
             int angle1, int angle2, int hue, int  theshade)
{

    XFillArc(dsply, drawable,
                    SpadFillGC(dsply, hue, theshade, "XSpadFillRectangle"),
                    x, y, width, height, angle1, angle2);
}


void
XSpadFillArcs(Display *dsply, Drawable drawable,XArc *arcs, int narcs,
              int hue, int theshade)
{
    XFillArcs(dsply, drawable,
                     SpadFillGC(dsply, hue, theshade, "XSpadFillArcs"),
                     arcs, narcs);
}