Calc texcoord for some pixmap - c

Question

I have a pixmap for some app in Xephyr and I need draw this pixmap on rectangle openGL. I seen example from khronos for pixmap when created in code but it's not working for me:
mPixmap = XCreatePixmap(dpy, client->getWindow(), static_cast<unsigned int>(attr.width),
static_cast<unsigned int>(attr.height), static_cast<unsigned int>(attr.depth));
And code where I drawed:
void startPluginPixmap() {
XEvent xev;
GLuint texture_id;
GLint pix_att[5] = { GLX_RGBA, GLX_DEPTH_SIZE, 24, GLX_DOUBLEBUFFER, None };
vi = glXChooseVisual(dpy, 0, pix_att);
swa.event_mask = ExposureMask | KeyPressMask;
swa.colormap = XCreateColormap(dpy, root, vi->visual, AllocNone);
uint64_t window_width = 300;
uint64_t window_height = 400;
uint32_t window_depth = vi->depth;
win = XCreateWindow(dpy, root, 0, 0, window_width, window_height, 0, window_depth, InputOutput, vi->visual, CWEventMask | CWColormap, &swa);
XMapWindow(dpy, win);
XStoreName(dpy, win, "PIXMAP TEST");
glc = glXCreateContext(dpy, vi, NULL, GL_TRUE);
if (!glc) {
exit(0);
}
glXMakeCurrent(dpy, win, glc);
glEnable(GL_DEPTH_TEST);
uint64_t pixmap_width = 150;
uint64_t pixmap_height = 100;
GC gc = DefaultGC(dpy, 0);
XFlush(dpy);
XImage * xim = XGetImage(dpy, mPixmap, 0, 0, pixmap_width, pixmap_height, AllPlanes, ZPixmap);
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &texture_id);
glBindTexture(GL_TEXTURE_2D, texture_id);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, pixmap_width, pixmap_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, (void *)(&(xim->data[0])));
XDestroyImage(xim);
while(true) {
XNextEvent(dpy, &xev);
if (xev.type == Expose) {
redrawPixmapImage();
}
else if (xev.type == KeyPress && xev.xkeymap.type == 0x19) {
glXMakeCurrent(dpy, None, NULL);
glXDestroyContext(dpy, glc);
XDestroyWindow(dpy, win);
XCloseDisplay(dpy);
exit(0);
}
}
}
void Cube::redrawPixmapImage() {
XWindowAttributes gwa;
XGetWindowAttributes(dpy, win, &gwa);
glViewport(0, 0, gwa.width, gwa.height);
glClearColor(.0, 1.0, .0, .5);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.25, 1.25, -1.25, 1.25, 1., 20.);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0., 0., 10., 0., 0., 0., 0., 1., 0.);
glColor3f(1.f, 1.f, 1.f);
glBegin(GL_QUADS);
glTexCoord2f(0.0, 0.0);
//glColor3f(1.f, 0.f, 0.f);
glVertex3f(-1.0, 1.0, 0.0);
glTexCoord2f(1.0, 0.0);
glVertex3f( 1.0, 1.0, 0.0);
glTexCoord2f(1.0, 1.0);
glVertex3f( 1.0, -1.0, 0.0);
glTexCoord2f(0.0, 1.0);
glVertex3f(-1.0, -1.0, 0.0);
glTexCoord2f(1.0, 1.0);
glVertex3f(-1.0, 1.0, 0.0);
glEnd();
glXSwapBuffers(dpy, win);
}
In this code I enter width and height manual because get it in debug info.
And for me this calculation of textcoord doesn't work (When I run in Xephyr xeyes, and then this code, I seeing artifacts and green area).
So, how I can calculate texcoords for pixmap some app?