meh

3 files changed, 754 insertions, 21 deletions

diff --git a/mariokart01.cpp b/mariokart01.cpp
new file mode 100644
index 0000000..5f6bcf2
--- /dev/null
+++ b/mariokart01.cpp
@@ -0,0 +1,508 @@
+/*
+ * unbenannt.cxx
+ * 
+ * Copyright 2012 Unknown <flo@archie>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * 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 <iostream>
+#include <xcb/xcb.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include <opencv2/opencv.hpp>
+
+using namespace std;
+using namespace cv;
+
+class XorgGrabber
+{
+	public:
+		XorgGrabber(const char* win_title);
+		~XorgGrabber();
+		void read(Mat& mat);
+	
+	private:
+		xcb_connection_t* conn;
+		xcb_window_t grabbed_win;
+		int grab_width, grab_height;
+		xcb_screen_t* grab_screen;
+		xcb_get_image_reply_t* img;
+
+};
+
+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();
+}
+
+/*
+int main()
+{
+	XorgGrabber grabber("Mupen64Plus OpenGL Video");
+	
+	namedWindow("meh");
+	Mat meh;
+	while(1)
+	{
+		grabber.read(meh);
+		imshow("meh",meh);
+		waitKey(100);
+	}
+}
+*/
+
+
+#define HIST_SMOOTH 7
+
+ //#define NO_BRIGHTN/SS // will man nicht, nur zu demonstrationszwecken
+
+#define ERODE_RADIUS_2D 4
+
+
+
+Mat circle_mat(int radius)
+{
+  Mat result(radius*2+1, radius*2+1, CV_8U);
+  for (int x=0; x<=result.cols/2; x++)
+    for (int y=0; y<=result.rows/2; y++)
+    {
+      unsigned char& p1 = result.at<unsigned char>(result.cols/2 + x, result.rows/2 + y);
+      unsigned char& p2 = result.at<unsigned char>(result.cols/2 - x, result.rows/2 + y);
+      unsigned char& p3 = result.at<unsigned char>(result.cols/2 + x, result.rows/2 - y);
+      unsigned char& p4 = result.at<unsigned char>(result.cols/2 - x, result.rows/2 - y);
+      
+      if ( x*x + y*y < radius*radius )
+        p1=p2=p3=p4=255;
+      else
+        p1=p2=p3=p4=0;
+    }
+    
+  return result;
+}
+
+int main(int argc, char* argv[])
+{
+	XorgGrabber capture("Mupen64Plus OpenGL Video");
+
+  int road_0=77, road_1=77, road_2=77;
+  
+  Mat transform;
+  
+  bool first=true;
+  int xlen, ylen;
+  
+  Mat erode_2d(ERODE_RADIUS_2D*2+1, ERODE_RADIUS_2D*2+1, CV_8U);
+  for (int x=0; x<=erode_2d.cols/2; x++)
+    for (int y=0; y<=erode_2d.rows/2; y++)
+    {
+      unsigned char& p1 = erode_2d.at<unsigned char>(erode_2d.cols/2 + x, erode_2d.rows/2 + y);
+      unsigned char& p2 = erode_2d.at<unsigned char>(erode_2d.cols/2 - x, erode_2d.rows/2 + y);
+      unsigned char& p3 = erode_2d.at<unsigned char>(erode_2d.cols/2 + x, erode_2d.rows/2 - y);
+      unsigned char& p4 = erode_2d.at<unsigned char>(erode_2d.cols/2 - x, erode_2d.rows/2 - y);
+      
+      if ( x*x + y*y < ERODE_RADIUS_2D*ERODE_RADIUS_2D )
+        p1=p2=p3=p4=255;
+      else
+        p1=p2=p3=p4=0;
+    }
+  
+  #define trans_width 600
+  #define trans_height 400
+  #define road_width 100
+  
+  while(1)
+  {
+    
+  Mat img_;
+
+  capture.read(img_);
+  
+  if (first)
+  {
+    xlen=img_.cols;
+    ylen=img_.rows;
+    
+    Point2f src_pts[4] =  { Point2f(0, ylen), Point2f(xlen, ylen),        Point2f(xlen* (.5 - 0.13), ylen/2), Point2f(xlen* (.5 + .13), ylen/2) };
+    //Point2f dest_pts[4] = { Point2f(0, ylen), Point2f(trans_width, ylen), Point2f(0, trans_height),       Point2f(0, trans_height) };
+    Point2f dest_pts[4] = { Point2f(trans_width/2 - road_width/2, trans_height), Point2f(trans_width/2 + road_width/2, trans_height),        Point2f(trans_width/2 - road_width/2, trans_height/2), Point2f(trans_width/2 + road_width/2, trans_height/2) };
+    transform=getPerspectiveTransform(src_pts, dest_pts);
+
+    
+    first=false;
+  }
+  assert ((img_.cols==xlen) && (img_.rows==ylen));
+  
+  namedWindow("orig");
+  namedWindow("edit");
+  
+  Mat img, img2;
+  img_.convertTo(img, CV_8UC3, 1); //FINDMICH
+  img.copyTo(img2);
+  
+  #ifdef NO_BRIGHTNESS
+  assert(img2.type()==CV_8UC3);
+  for (int row = 0; row<img2.rows; row++)
+  {
+    uchar* data=img2.ptr<uchar>(row);
+    
+    for (int col=0; col<img2.cols;col++)
+    {
+      int sum=data[0] + data[1] + data[2];
+      if (sum>0)
+      {
+        data[0]=(int)data[0] * 256 / sum;
+        data[1]=(int)data[1] * 256 / sum;
+        data[2]=(int)data[2] * 256 / sum;
+      }
+      else
+      {
+        data[0]=255/3;
+        data[1]=255/3;
+        data[2]=255/3;
+      }
+      data+=3;
+    }
+  }
+  #endif
+  
+  
+  Mat img_diff(img.rows, img.cols, CV_8U);
+  int hist[256];
+  for (int i=0; i<256; i++) hist[i]=0;
+  for (int row = 0; row<img2.rows; row++)
+  {
+    uchar* data=img2.ptr<uchar>(row);
+    uchar* data_out=img_diff.ptr<uchar>(row);
+    
+    for (int col=0; col<img2.cols;col++)
+    {
+      int diff = (abs((int)data[0] - road_0) + abs((int)data[1] - road_1) + abs((int)data[2] - road_2)) /3;
+      *data_out=diff;
+      hist[diff]++;
+      data+=3;
+      data_out++;
+    }
+  }
+  
+  int hist2[256];
+  for (int i=0; i<256; i++)
+  {
+    int sum=0;
+    for (int j=-HIST_SMOOTH; j<=HIST_SMOOTH; j++)
+    {
+      if (i+j < 0 || i+j > 255) continue;
+      sum+=hist[i+j];
+    }
+    hist2[i]=sum;
+  }
+  
+  int cumul=0;
+  int x_begin=0;
+  for (x_begin=0;x_begin<256;x_begin++)
+  {
+    cumul+=hist[x_begin];
+    if (cumul > img.rows*img.cols/100) break;
+  }
+  
+  int hist_max=0;
+  int thres;
+  for (int i=0; i<256; i++)
+  {
+    if (hist2[i]>hist_max) hist_max=hist2[i];
+    if ((hist2[i] < hist_max/2) && (i>x_begin))
+    {
+      thres=i; break;
+    }
+  }
+  
+  Mat img_hist(100,256, CV_8U);
+  for (int row = 0; row<img_hist.rows; row++)
+  {
+    uchar* data=img_hist.ptr<uchar>(row);
+    
+    for (int col=0; col<img_hist.cols;col++)
+    {
+      *data=255;
+      if (col==thres) *data=127;
+      if (col==x_begin) *data=0;
+      if (hist2[col] > (img_hist.rows-row)*800) *data=0;
+      data++;
+    }
+  }
+  
+  Mat img_thres(img_diff.rows, img_diff.cols, img_diff.type());
+  threshold(img_diff, img_thres, thres, 255, THRESH_BINARY_INV);
+  
+  Mat img_eroded(img_thres.rows, img_thres.cols, img_thres.type());
+  Mat img_thres2(img_thres.rows, img_thres.cols, img_thres.type());
+  erode(img_thres, img_eroded, Mat::ones(3, 3, CV_8U));
+  dilate(img_eroded, img_thres2, Mat::ones(3, 3, CV_8U));
+  
+  
+  assert(img.rows==img_eroded.rows);
+  assert(img.cols==img_eroded.cols);
+  int avg_sum=0;
+  road_0=road_1=road_2=0;
+  for (int row = 0; row<img.rows; row++)
+  {
+    uchar* data=img.ptr<uchar>(row);
+    uchar* mask=img_eroded.ptr<uchar>(row);
+    
+    int mean_value_line_sum=0;
+    int mean_value_line_cnt=0;
+    int mean_value_line;
+    for (int col=0; col<img.cols;col++)
+    {
+      if (*mask)
+      {
+        avg_sum++;
+        mean_value_line_sum+=col;
+        mean_value_line_cnt++;
+        road_0+=data[0];
+        road_1+=data[1];
+        road_2+=data[2];
+      }
+      
+      data+=3;
+      mask++;
+    }
+    
+    if (mean_value_line_cnt)
+    {
+		mean_value_line=mean_value_line_sum/mean_value_line_cnt;
+		int variance_line=0;
+		int stddev_line;
+		uchar* mask=img_eroded.ptr<uchar>(row);
+		for (int col=0; col<img.cols;col++)
+		{
+		  if (*mask)
+			variance_line+=(col-mean_value_line)*(col-mean_value_line);
+		  
+		  data+=3;
+		  mask++;
+		}
+		variance_line/=mean_value_line_cnt;
+		stddev_line=sqrt(variance_line);
+		if (mean_value_line>1 && mean_value_line < img.cols-2)
+		{
+			img_thres2.ptr<uchar>(row)[mean_value_line-1]=128;
+			img_thres2.ptr<uchar>(row)[mean_value_line]=128;
+			img_thres2.ptr<uchar>(row)[mean_value_line+1]=128;
+		}
+		if ((mean_value_line+stddev_line)>1 && (mean_value_line+stddev_line) < img.cols-2)
+		{
+			img_thres2.ptr<uchar>(row)[mean_value_line-1+stddev_line]=128;
+			img_thres2.ptr<uchar>(row)[mean_value_line+stddev_line]=128;
+			img_thres2.ptr<uchar>(row)[mean_value_line+1+stddev_line]=128;
+		}
+		if ((mean_value_line-stddev_line)>1 && (mean_value_line-stddev_line) < img.cols-2)
+		{
+			img_thres2.ptr<uchar>(row)[mean_value_line-1-stddev_line]=128;
+			img_thres2.ptr<uchar>(row)[mean_value_line-stddev_line]=128;
+			img_thres2.ptr<uchar>(row)[mean_value_line+1-stddev_line]=128;
+		}
+	}
+  }
+  
+  if (avg_sum>20)
+  {
+	  road_0/=avg_sum;
+	  road_1/=avg_sum;
+	  road_2/=avg_sum;
+	}
+
+/*
+  Mat img_perspective(trans_height, trans_width, img_thres.type());
+  warpPerspective(img_thres, img_perspective, transform, img_perspective.size());
+
+
+  threshold(img_perspective, img_perspective, 127, 255, THRESH_BINARY);
+  Mat img_perspective_temp(img_perspective.rows, img_perspective.cols, img_perspective.type());
+  Mat img_perspective_temp2(img_perspective.rows, img_perspective.cols, img_perspective.type());
+  erode(img_perspective, img_perspective_temp, circle_mat(7));
+  dilate(img_perspective_temp, img_perspective_temp2, circle_mat(7 + 15));
+  erode(img_perspective_temp2, img_perspective, circle_mat(15));
+  */
+
+  
+  imshow("orig", img);
+  imshow("edit", img2);
+  //imshow("perspective", img_perspective);
+  imshow("diff", img_diff);
+  imshow("hist", img_hist);
+  imshow("thres", img_thres2);
+  
+  waitKey(1000/50);
+  //waitKey();
+}
+}
diff --git a/xcb02.cpp b/xcb02.cpp
index 29c0bd6..bd5bf1b 100644
--- a/xcb02.cpp
+++ b/xcb02.cpp
@@ -42,8 +42,7 @@ int main(int argc, char **argv)
 	xcb_screen_t* grab_screen=NULL;
 	
 	/* Find configured screen */
-	const xcb_setup_t *setup = xcb_get_setup(conn);
-	xcb_screen_t *scr = NULL;
+	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))
 	{
@@ -73,26 +72,24 @@ int main(int argc, char **argv)
 					cout << title << endl;
 					if (strstr(title, "Mupen64Plus OpenGL Video"))
 					{
-						grabbed_win=children[i];
-						found_win=true;
+						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;
 
-						/* Window properties */
-						xcb_get_geometry_reply_t *geo;
-						geo = xcb_get_geometry_reply (conn,
-							xcb_get_geometry (conn, grabbed_win),
-							NULL);
-						if (geo == NULL)
+							grab_screen=scr;						
+						}
+						else
 						{
 							cerr << "geo==NULL!" << endl;
-							exit(1);
 						}
-						
-						grab_width=geo->width;
-						grab_height=geo->height;
-						
-						free(geo);
-
-						grab_screen=scr;						
 					}
 				}
 
@@ -103,6 +100,10 @@ int main(int argc, char **argv)
 			free(reply);
 			delete[] cookies;
 		}
+		else
+		{
+			cout << "xcb_get_setup failed" << endl;
+		}
 	}
 	
 	if (found_win)
@@ -159,15 +160,20 @@ int main(int argc, char **argv)
 		
 		cout << grab_width << "x" << grab_height << endl;
 		
+		free(img);
+		
 		while(1)
 		{
+			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 meh(grab_height, grab_width, CV_8UC4, xcb_get_image_data(img));
 			namedWindow("meh");
 			imshow("meh", meh);
 			waitKey(50);
-			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);
+			
+			free(img);
 
 		}
 		
diff --git a/xcb03.cpp b/xcb03.cpp
new file mode 100644
index 0000000..9fa9292
--- /dev/null
+++ b/xcb03.cpp
@@ -0,0 +1,219 @@
+/*
+ * unbenannt.cxx
+ * 
+ * Copyright 2012 Unknown <flo@archie>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * 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 <iostream>
+#include <xcb/xcb.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include <opencv2/opencv.hpp>
+
+using namespace std;
+using namespace cv;
+
+class XorgGrabber
+{
+	public:
+		XorgGrabber(const char* win_title);
+		~XorgGrabber();
+		void read(Mat& mat);
+	
+	private:
+		xcb_connection_t* conn;
+		xcb_window_t grabbed_win;
+		int grab_width, grab_height;
+		xcb_screen_t* grab_screen;
+		xcb_get_image_reply_t* img;
+
+};
+
+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));
+}
+
+int main()
+{
+	XorgGrabber grabber("Mupen64Plus OpenGL Video");
+	
+	namedWindow("meh");
+	Mat meh;
+	while(1)
+	{
+		grabber.read(meh);
+		imshow("meh",meh);
+		waitKey(100);
+	}
+}