added SDL backend for easier testing

[winnie] / src / fbdev / mouse.cc

diff --git a/src/fbdev/mouse.cc b/src/fbdev/mouse.cc
new file mode 100644 (file)
index 0000000..5fd080b
--- /dev/null
+++ b/src/fbdev/mouse.cc
@@ -0,0 +1,161 @@
+#ifdef WINNIE_FBDEV
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include "geom.h"
+#include "gfx.h"
+#include "mouse.h"
+#include "window.h"
+#include "wm.h"
+
+#define BN_LEFT                1
+#define BN_RIGHT       2
+#define BN_MIDDLE      4
+
+static int read_mouse();
+
+static int dev_fd = -1;        // file descriptor for /dev/psaux
+static Rect bounds;
+static int pointer_x, pointer_y;
+static int bnstate;
+
+bool init_mouse()
+{
+       if((dev_fd = open("/dev/psaux", O_RDONLY | O_NONBLOCK)) == -1) {
+               fprintf(stderr, "Cannot open /dev/psaux : %s\n", strerror(errno));
+               return false;
+       }
+
+       set_mouse_bounds(get_screen_size());
+       return true;
+}
+
+void destroy_mouse()
+{
+       if(dev_fd != -1) {
+               close(dev_fd);
+               dev_fd = -1;
+       }
+}
+
+void set_mouse_bounds(const Rect &rect)
+{
+       bounds = rect;
+}
+
+int get_mouse_fd()
+{
+       return dev_fd;
+}
+
+void process_mouse_event()
+{
+       /* TODO:
+        * - read all pending events from mouse fd (use O_NONBLOCK so that
+        *   read will return -1 when there are no more events instead of blocking).
+        */
+
+       int prev_state = bnstate;
+       int prev_x = pointer_x;
+       int prev_y = pointer_y;
+
+       if(read_mouse() == -1) {
+               return;
+       }
+
+       Window *top = wm->get_window_at_pos(pointer_x, pointer_y);
+       if(top) {
+               wm->set_focused_window(top);
+       }
+       else {
+               wm->set_focused_window(0);
+       }
+
+        /* - send each pointer move and button press/release to the topmost window
+        *   with the pointer on it.
+        */
+
+       int dx = pointer_x - prev_x;
+       int dy = pointer_y - prev_y;
+
+       if((dx || dy) && top) {
+               MouseMotionFuncType motion_callback = top->get_mouse_motion_callback();
+               if(motion_callback) {
+                       Rect rect = top->get_absolute_rect();
+                       motion_callback(top, pointer_x - rect.x, pointer_y - rect.y);
+               }
+       }
+
+       MouseButtonFuncType button_callback;
+       if((bnstate != prev_state) && top && (button_callback = top->get_mouse_button_callback())) {
+               int num_bits = sizeof bnstate * CHAR_BIT;
+               for(int i=0; i<num_bits; i++) {
+                       int s = (bnstate >> i) & 1;
+                       int prev_s = (prev_state >> i) & 1;
+                       if(s != prev_s) {
+                               button_callback(top, i, s);
+                       }
+               }
+       }
+}
+
+void get_pointer_pos(int *x, int *y)
+{
+       *x = pointer_x;
+       *y = pointer_y;
+}
+
+int get_button_state()
+{
+       return bnstate;
+}
+
+int get_button(int bn)
+{
+       if(bn < 0 || bn >= 3) {
+               return 0;
+       }
+       return (bnstate & (1 << bn)) != 0;
+}
+
+static int read_mouse()
+{
+       int rd;
+       signed char state[3] = {0, 0, 0};
+
+       if((rd = read(dev_fd, state, 3)) == -1) {
+               fprintf(stderr, "Unable to get mouse state : %s\n", strerror(errno));
+               return -1;
+       }
+
+       bnstate = state[0] & 7;
+       pointer_x += state[1];
+       pointer_y -= state[2];
+
+       if(pointer_x < bounds.x) {
+               pointer_x = bounds.x;
+       }
+
+       if(pointer_y < bounds.y) {
+               pointer_y = bounds.y;
+       }
+
+       if(pointer_x > bounds.x + bounds.width - 1) {
+               pointer_x = bounds.x + bounds.width - 1;
+       }
+
+       if(pointer_y > bounds.y + bounds.height - 1) {
+               pointer_y = bounds.y + bounds.height - 1;
+       }
+
+       return 0;
+}
+#endif // WINNIE_FBDEV