From 2a5ac99e6e06078713f684fee2466c91f677b303 Mon Sep 17 00:00:00 2001 From: Antonio Ospite Date: Fri, 26 Sep 2014 00:44:17 +0200 Subject: [PATCH] x11grab: Check the XQueryPointer return value The paint_mouse_pointer() code uses XFixes to retrieve the cursor coordinates, but XFixes gives no information about which screen the pointer is on; this results in always drawing the cursor on the captured screen even if the mouse pointer was on another screen. For example, when capturing from screen 1 (i.e. -f x11grab -i ":0.1") the cursor was being drawn in the captured image even when the mouse pointer was actually on screen 0, which is wrong and visually confusing. CC: libav-stable@libav.org Signed-off-by: Luca Barbato --- libavdevice/x11grab.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/libavdevice/x11grab.c b/libavdevice/x11grab.c index 1f91be9f29..3aa4294059 100644 --- a/libavdevice/x11grab.c +++ b/libavdevice/x11grab.c @@ -487,8 +487,8 @@ static int x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt) int x_off = s->x_off; int y_off = s->y_off; int follow_mouse = s->follow_mouse; - int screen; - Window root; + int screen, pointer_x, pointer_y, _, same_screen = 1; + Window w, root; int64_t curtime, delay; struct timespec ts; @@ -516,14 +516,16 @@ static int x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt) screen = DefaultScreen(dpy); root = RootWindow(dpy, screen); - if (follow_mouse) { + + if (follow_mouse || s->draw_mouse) + same_screen = XQueryPointer(dpy, root, &w, &w, + &pointer_x, &pointer_y, &_, &_, &_); + + if (follow_mouse && same_screen) { int screen_w, screen_h; - int pointer_x, pointer_y, _; - Window w; screen_w = DisplayWidth(dpy, screen); screen_h = DisplayHeight(dpy, screen); - XQueryPointer(dpy, root, &w, &w, &pointer_x, &pointer_y, &_, &_, &_); if (follow_mouse == -1) { // follow the mouse, put it at center of grabbing region x_off += pointer_x - s->width / 2 - x_off; @@ -550,7 +552,7 @@ static int x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt) s->y_off - REGION_WIN_BORDER); } - if (s->show_region) { + if (s->show_region && same_screen) { if (s->region_win) { XEvent evt = { .type = NoEventMask }; // Clean up the events, and do the initial draw or redraw. @@ -572,7 +574,7 @@ static int x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt) av_log(s1, AV_LOG_INFO, "XGetZPixmap() failed\n"); } - if (s->draw_mouse) + if (s->draw_mouse && same_screen) paint_mouse_pointer(image, s); return s->frame_size;