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/*
* xorg_grabber.cpp
*
* Copyright 2012 Florian Jung <florian.a.jung@web.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License Version 3
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include "xorg_grabber.h"
#include <iostream>
using namespace std;
XorgGrabber::XorgGrabber(const char* win_title)
{
conn=xcb_connect(NULL,NULL);
bool found_win=false;
grab_screen=NULL;
img=NULL;
/* Find configured screen */
const xcb_setup_t* setup = xcb_get_setup(conn);
for (xcb_screen_iterator_t i = xcb_setup_roots_iterator(setup);
i.rem > 0; xcb_screen_next (&i))
{
xcb_screen_t* scr = i.data;
xcb_query_tree_reply_t* reply = xcb_query_tree_reply( conn, xcb_query_tree(conn, scr->root), NULL);
if (reply)
{
int len = xcb_query_tree_children_length(reply);
xcb_window_t* children = xcb_query_tree_children(reply);
xcb_get_window_attributes_cookie_t* cookies = new xcb_get_window_attributes_cookie_t[len];
for (int i=0; i<len; ++i)
cookies[i]=xcb_get_window_attributes(conn, children[i]);
for (int i=0; i<len; ++i)
{
xcb_get_window_attributes_reply_t* attr =
xcb_get_window_attributes_reply (conn, cookies[i], NULL);
xcb_get_property_reply_t* title_reply = xcb_get_property_reply(conn,
xcb_get_property(conn, false, children[i], XCB_ATOM_WM_NAME, XCB_GET_PROPERTY_TYPE_ANY, 0, 128),
NULL );
if (!attr->override_redirect && attr->map_state == XCB_MAP_STATE_VIEWABLE)
{
char* title=(char*)(title_reply+1);
cout << title << endl;
if (strstr(title, win_title))
{
xcb_get_geometry_reply_t* geo;
geo = xcb_get_geometry_reply (conn, xcb_get_geometry (conn, children[i]), NULL);
if (geo)
{
grab_width=geo->width;
grab_height=geo->height;
free(geo);
grabbed_win=children[i];
found_win=true;
grab_screen=scr;
}
else
{
cerr << "geo==NULL!" << endl;
}
}
}
free(title_reply);
free(attr);
}
free(reply);
delete[] cookies;
}
else
{
cout << "xcb_get_setup failed" << endl;
}
}
if (found_win)
{
xcb_get_image_reply_t* img = xcb_get_image_reply (conn,
xcb_get_image (conn, XCB_IMAGE_FORMAT_Z_PIXMAP, grabbed_win,
0, 0, grab_width, grab_height, ~0), NULL);
xcb_depth_iterator_t depth_iterator = xcb_screen_allowed_depths_iterator(grab_screen);
int ndepths=xcb_screen_allowed_depths_length(grab_screen);
for (int i=0; i<ndepths; ++i)
{
if (depth_iterator.data->depth == img->depth)
{
xcb_visualtype_t* visuals = xcb_depth_visuals(depth_iterator.data);
int nvisuals = xcb_depth_visuals_length(depth_iterator.data);
for (int j=0;j<nvisuals;j++)
{
if (visuals[j].visual_id==img->visual)
{
assert(visuals[j]._class==XCB_VISUAL_CLASS_TRUE_COLOR || visuals[j]._class==XCB_VISUAL_CLASS_DIRECT_COLOR);
cout << (int)visuals[j]._class << "," << XCB_VISUAL_CLASS_TRUE_COLOR << endl;
cout << visuals[j].red_mask << endl;
cout << visuals[j].green_mask << endl;
cout << visuals[j].blue_mask << endl;
break;
}
}
break;
}
xcb_depth_next(&depth_iterator);
}
int nformats = xcb_setup_pixmap_formats_length(setup);
xcb_format_t* formats = xcb_setup_pixmap_formats(setup);
for (int i=0;i<nformats;i++)
{
if (formats[i].depth==img->depth)
{
cout << (int)formats[i].bits_per_pixel << endl;
cout << (int)formats[i].scanline_pad << endl;
break;
}
}
cout << grab_width << "x" << grab_height << endl;
free(img);
}
else
{
throw string("FATAL: did not find window, exiting.");
}
}
XorgGrabber::~XorgGrabber()
{
if (img) free(img);
xcb_disconnect(conn);
}
void XorgGrabber::read(Mat& mat)
{
if (img) free(img);
// mat gets invalid when the next read() is called!
img = xcb_get_image_reply (conn,
xcb_get_image (conn, XCB_IMAGE_FORMAT_Z_PIXMAP, grabbed_win,
0, 0, grab_width, grab_height, ~0), NULL);
mat = Mat(grab_height, grab_width, CV_8UC4, xcb_get_image_data(img));
mat.addref();
}
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