paint: initial commit of xi2 test program

4 files changed, 247 insertions, 0 deletions

diff --git a/paint/Makefile b/paint/Makefile
new file mode 100644
index 0000000..03cb468
--- /dev/null
+++ b/paint/Makefile
@@ -0,0 +1,15 @@
+PROJECT =  paint
+OBJ = paint.o init.o
+
+C99     =  gcc --std=gnu99
+CFLAGS  =  -Wall -g `pkg-config --cflags --libs xi`
+
+$(PROJECT) : $(OBJ)
+	$(C99) $(CFLAGS) -o $(PROJECT) $(OBJ)
+
+%.o : %.c
+	$(C99) $(CFLAGS) -c $< -o $@
+
+clean : 
+	rm -f $(OBJ)
+
diff --git a/paint/init.c b/paint/init.c
new file mode 100644
index 0000000..3eced0e
--- /dev/null
+++ b/paint/init.c
@@ -0,0 +1,74 @@
+#include "paint.h"
+
+int
+xInit (void)
+{
+    paint.d = XOpenDisplay(NULL);
+	if(!paint.d) return 1;
+
+    int event, error;
+    if(!XQueryExtension(paint.d, "XInputExtension", &paint.opcode, &event, &error))
+    {
+        fprintf(stdout, "XInput extension not available\n");
+        return 1;
+    }    
+   
+    int major=2, minor=0;
+    if(XIQueryVersion (paint.d, &major, &minor) == BadRequest)
+    {
+        fprintf(stdout, "XInput 2 not available. Server supports %d.%d\n", major, minor);
+    }
+
+
+    paint.window = XCreateSimpleWindow(paint.d, RootWindow(paint.d, 0),
+                                       0, 0, 400, 400, 0, 0, 0);
+
+    XMapWindow(paint.d, paint.window);
+    XFlush(paint.d);  
+    
+    XIEventMask eventmask;
+    unsigned char mask[1] = {};
+
+    eventmask.deviceid = XIAllMasterDevices;
+    eventmask.mask_len = sizeof (mask);
+    eventmask.mask = mask;
+    XISetMask(mask, XI_ButtonPress);
+    XISetMask(mask, XI_ButtonRelease);
+    XISetMask(mask, XI_Motion);
+    
+    XISelectEvents(paint.d, paint.window, &eventmask, 1);
+ 
+    paint.gc = XCreateGC (paint.d, paint.window, 0, 0);
+    
+    XSetLineAttributes(paint.d, paint.gc, 5, LineSolid, CapButt, JoinRound);
+    
+    return 0;
+}
+
+int
+pInit (void)
+{
+    paint.paintbox.windows = calloc (sizeof(TestPaintWindow), 3);
+        if(!paint.paintbox.windows) return 1;
+
+    paint.paintbox.nWindows = 3;
+
+    setColour(&paint.paintbox.windows[0].colour, 255,0,0);
+    setColour(&paint.paintbox.windows[1].colour, 0,255,0);
+    setColour(&paint.paintbox.windows[2].colour, 0,0,255);
+
+    paint.paintbox.windows[0].id = XCreateSimpleWindow(paint.d, paint.window,
+                                       0, 0, 20, 20, 0, 0,
+                                       paint.paintbox.windows[0].colour);
+    paint.paintbox.windows[1].id = XCreateSimpleWindow(paint.d, paint.window,
+                                       0, 20, 20, 20, 0, 0,
+                                       paint.paintbox.windows[1].colour);
+    paint.paintbox.windows[2].id = XCreateSimpleWindow(paint.d, paint.window,
+                                       0, 40, 20, 20, 0, 0,
+                                       paint.paintbox.windows[2].colour);
+
+    for(int i=0; i<3; i++) XMapWindow(paint.d, paint.paintbox.windows[i].id);
+    XFlush (paint.d);
+
+    return 0;
+}
diff --git a/paint/paint.c b/paint/paint.c
new file mode 100644
index 0000000..0ef8f80
--- /dev/null
+++ b/paint/paint.c
@@ -0,0 +1,109 @@
+/*
+ * Author: Joel Bosveld <joel.bosveld@gmail.com>
+ */
+ 
+#include "paint.h"
+#include <limits.h>
+TestPaint paint;
+
+void setColour (long *c, char r, char g, char b)
+{
+    char *colour = (char*) c;
+        
+    colour[0]=b;
+    colour[1]=g;
+    colour[2]=r;
+}
+
+void setColourFromWindow (TestCursor *c, Window w)
+{
+    for (int i=0; i<paint.paintbox.nWindows; i++)
+    {
+        if (paint.paintbox.windows[i].id == w)
+        {
+            c->colour = paint.paintbox.windows[i].colour;
+            return;
+        }
+    }
+}
+
+TestCursor *createTestCursor (int xid)
+{
+    TestCursor *c = calloc(sizeof(TestCursor),1);
+        if(!c) return NULL;
+    setColour(&c->colour, 255, 0, 0);
+    c->device_id = xid;
+    c->next = paint.head;
+    paint.head = c;
+    
+    return c;
+}
+
+TestCursor *findTestCursor (int xid)
+{
+    TestCursor *c;
+    for(c=paint.head; c; c=c->next) if(c->device_id == xid) return c;
+    return createTestCursor (xid);
+}
+      
+int
+main (int argc, char **argv)
+{
+    if(xInit ())
+        return 1;
+    if(pInit ())
+        return 1;
+
+    while(1)
+    {
+	XEvent event;
+	XNextEvent(paint.d, &event);
+        XIDeviceEvent *ev = (XIDeviceEvent *) &event;
+        if (ev->type == GenericEvent && ev->extension == paint.opcode)
+        {
+            switch(ev->evtype)
+            {
+                TestCursor *c = NULL;
+                case XI_ButtonPress:
+                    c = findTestCursor(ev->deviceid);
+                        if(!c) break;
+                    if(ev->child == None)
+                    {
+                        c->x = (int) ev->event_x;
+                        c->y = (int) ev->event_y;
+                        c->drawing = 1;
+                    }
+                    else
+                    {
+                        setColourFromWindow (c, ev->child);
+                    }
+                    break;
+
+                case XI_ButtonRelease:
+                    c = findTestCursor(ev->deviceid);
+                        if(!c) break;
+                    c->drawing = 0;
+                    break;
+
+                case XI_Motion:
+                    c = findTestCursor(ev->deviceid);
+                        if(!c) break;
+                    if(c->drawing)
+                    {
+                        XSetForeground (paint.d, paint.gc, c->colour); 
+                        XDrawLine(paint.d, paint.window, paint.gc, c->x, c->y,
+                                  (int) ev->event_x, (int) ev->event_y);
+                    }
+                    c->x = (int) ev->event_x;
+                    c->y = (int) ev->event_y;
+
+                    break;
+
+                default:
+                    fprintf(stderr,"Unknow event type: %d\n", ev->evtype);
+                    break;
+            }
+            XIFreeEventData ((XIEvent *) ev);
+        }
+    } 
+}
diff --git a/paint/paint.h b/paint/paint.h
new file mode 100644
index 0000000..3faadd0
--- /dev/null
+++ b/paint/paint.h
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <X11/Xlib.h>
+#include <X11/extensions/XInput2.h>
+
+typedef struct _TestCursor TestCursor;
+
+struct _TestCursor
+{
+    TestCursor *next;
+    
+    int x;
+    int y;
+    
+    int drawing;
+    
+    long colour;
+    
+    int device_id;
+};
+
+typedef struct
+{
+    Window id;
+    long colour;
+} TestPaintWindow;
+
+typedef struct
+{
+    TestPaintWindow     *windows;
+    int                 nWindows;
+} TestPaintBox;
+
+typedef struct
+{
+    Display *d;
+    TestCursor *head;
+    TestPaintBox paintbox;
+    Window window;
+
+    int opcode;
+    GC gc;
+} TestPaint;
+
+extern TestPaint paint;
+
+int xInit (void);
+int pInit (void);
+void setColour (long *c, char r, char g, char b);