Clemens Eisserer

#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 sourcePixmap;
Picture sourcePicture;

Pixmap maskPixmap;
Picture maskPicture;

/*Creates source picture*/
Picture createSourcePicture()
{
    XRenderPictFormat *fmt = XRenderFindStandardFormat(display, PictStandardRGB24);
    sourcePixmap = XCreatePixmap(display, window, 100, 100, 24);
    XRenderPictureAttributes pict_attr;
    Picture picture = XRenderCreatePicture(display, sourcePixmap, fmt, 0, &pict_attr);

        XRenderColor yellow={.red=0xffff, .green=0xffff, .blue=0, .alpha=0xffff};
        XRenderFillRectangle (display, PictOpSrc, picture, &yellow, 0, 0, 1000, 1000);

    return picture;
}

/*Creates mask picture*/
Picture createMaskPicture()
{
    XRenderPictFormat *fmt = XRenderFindStandardFormat(display, PictStandardA8);
    maskPixmap = XCreatePixmap(display, window, 1, 1, 8);
    XRenderPictureAttributes pict_attr;
    Picture picture = XRenderCreatePicture(display, maskPixmap, fmt, 0, &pict_attr);

        XRenderColor yellow={.red=0xffff, .green=0xffff, .blue=0, .alpha=0xffff};
        XRenderFillRectangle (display, PictOpSrc, picture, &yellow, 0, 0, 1000, 1000);

    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);


    /* now make the window visible */
    XMapWindow(display, window);

    XRenderColor color_white = {.red=0xffff, .green=0xffff, .blue=0xffff, .alpha=0xffff};

        sourcePicture = createSourcePicture();
        maskPicture = createMaskPicture();

        XRenderSetPictureFilter(display, sourcePicture, "fast", NULL, 0);
        XRenderSetPictureFilter(display, maskPicture, "fast", NULL, 0);

        XTransform xf;
        xf.matrix[0][0] = XDoubleToFixed(0.438791280945186);
        xf.matrix[0][1] = XDoubleToFixed(0.239712769302102);
        xf.matrix[0][2] = XDoubleToFixed(-13.755117572194017);
        xf.matrix[1][0] = XDoubleToFixed(-0.239712769302102);
        xf.matrix[1][1] = XDoubleToFixed(0.438791280945186);
        xf.matrix[1][2] = XDoubleToFixed(7.343992411903851);
        xf.matrix[2][0] = 0;
        xf.matrix[2][1] = 0;
        xf.matrix[2][2] = 1<<16;
        XRenderSetPictureTransform (display, sourcePicture, &xf);


        xf.matrix[0][0] = XDoubleToFixed(0.013712227529537);
        xf.matrix[0][1] = XDoubleToFixed(0.007491024040691);
        xf.matrix[0][2] = XDoubleToFixed(-0.429847424131063);
        xf.matrix[1][0] = XDoubleToFixed(-0.007491024040691);
        xf.matrix[1][1] = XDoubleToFixed(0.013712227529537);
        xf.matrix[1][2] = XDoubleToFixed(0.229499762871995);
        xf.matrix[2][0] = 0;
        xf.matrix[2][1] = 0;
        xf.matrix[2][2] = 1<<16;
        XRenderSetPictureTransform (display, maskPicture, &xf);

    while(1) {
        XNextEvent(display, &event);

        switch(event.type) {
            case Expose:
{
                XRenderFillRectangle(display, PictOpOver,
                    picture, &color_white, 0, 0, 1000, 1000);

                                 XRenderComposite (display, PictOpOver, sourcePicture, maskPicture, picture, 0, 0, 0, 0, 0, 0, 500, 500);

                break;
            case DestroyNotify:
                return 0;
        }
    }

}
    return 0;
}