#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/extensions/Xrender.h>
#include <stdlib.h>
#include <math.h>
#include <stdlib.h>
#include <sys/time.h>

Display *display;
int screen;
Window root, window;
XEvent event;

Pixmap maskPixmap;
Picture sourcePicture;


Picture createPicture()
{
    XLinearGradient linearGradient;
    XFixed             stops[2];
    XRenderColor       colors[2];

    linearGradient.p1.x = 29053656;
    linearGradient.p1.y = 15875466;
    linearGradient.p2.x = 1336988;
    linearGradient.p2.y = 3230600;
    
    stops[0] = 0;
    stops[1] = 65536;
    
    colors[0].red = 0xffff;
    colors[0].green = 255;
    colors[0].blue = 255;
    colors[0].alpha = 0xffff;
    
    colors[1].red = 255;
    colors[1].green = 27647;
    colors[1].blue = 0xffff;
    colors[1].alpha = 0xffff;
    
    Picture picture =  XRenderCreateLinearGradient (display, &linearGradient, stops, colors, 2);
    
    XRenderPictureAttributes pict_attr;
    pict_attr.repeat=RepeatReflect;
    XRenderChangePicture (display,
                  picture,
                  CPRepeat,
                    &pict_attr);
    
    return picture;
}

int main(int argc, char *argv[])
{
        /*Bosing initialization stuff*/
    display=XOpenDisplay(NULL);
    
    int render_event_base, render_error_base;
    int render_present=XRenderQueryExtension(display, &render_event_base, &render_error_base);
    if (!render_present) {
        fprintf(stderr, "RENDER extension missing!\n");
        abort();
    }
    
    XRenderPictFormat *fmt=XRenderFindStandardFormat(display, PictStandardRGB24);
    screen=DefaultScreen(display);
    root=DefaultRootWindow(display);
    
    window = XCreateWindow(display, root, 0, 0, 640, 480, 0,
        DefaultDepth(display, screen), InputOutput,
        DefaultVisual(display, screen), 
        0, NULL);
    XRenderPictureAttributes pict_attr;
    
    pict_attr.poly_edge=PolyEdgeSmooth;
    pict_attr.poly_mode=PolyModeImprecise;
    Picture picture=XRenderCreatePicture(display, window, fmt, CPPolyEdge|CPPolyMode, &pict_attr);
    
    XSelectInput(display, window, KeyPressMask|KeyReleaseMask|ExposureMask
        |ButtonPressMask|StructureNotifyMask);
    
    XMapWindow(display, window);
    
    sourcePicture = createPicture();

    while(1) {
        XNextEvent(display, &event);
        
        switch(event.type) {
            case Expose:
                XRenderComposite (display, PictOpOver, sourcePicture, None, picture, 0, 0, 0, 0, 0, 0, 1000, 1000); 
                break;
                
            case DestroyNotify:
                return 0;
        }
    }
    return 0;
}