[Qemu-devel] [PATCH] mouse click simple queue

[Stefano Stabellini]

Hi all,

qemu doesn't enqueue mouse events, just records the latest mouse state.
This can cause some lost mouse double clicks if the events are not 
processed fast enought.
I am attaching a patch that implements a simple queue for left mouse 
click events.

Best Regards,

Stefano Stabellini

Index: sdl.c
===================================================================
RCS file: /sources/qemu/qemu/sdl.c,v
retrieving revision 1.45
diff -r1.45 sdl.c
293c293
< static void sdl_send_mouse_event(int dz)
---
> static void sdl_send_mouse_event(int dx, int dy, int dz, int state)
295,297c295,296
<     int dx, dy, state, buttons;
<     state = SDL_GetRelativeMouseState(&dx, &dy);
<     buttons = 0;
---
>     int buttons = 0;
>     
314c313
<       SDL_GetMouseState(&dx, &dy);
---
>         SDL_GetMouseState(&dx, &dy);
477c476,478
<                 sdl_send_mouse_event(0);
---
>                 int dx, dy, state;
>                 state = SDL_GetRelativeMouseState(&dx, &dy);
>                 sdl_send_mouse_event(dx, dy, 0, state);
480d480
<         case SDL_MOUSEBUTTONDOWN:
481a482,488
>             if (gui_grab || kbd_mouse_is_absolute()) {
>                 int dx, dy, state;
>                 state = SDL_GetRelativeMouseState(&dx, &dy);
>                 sdl_send_mouse_event(dx, dy, 0, state);
>             }
>             break;
>         case SDL_MOUSEBUTTONDOWN:
491c498
<                     int dz;
---
>                     int dx, dy, dz, state;
492a500
>                     state = SDL_GetRelativeMouseState(&dx, &dy);
494c502
<                     if (bev->button == SDL_BUTTON_WHEELUP && ev->type == 
SDL_MOUSEBUTTONDOWN) {
---
>                     if (bev->button == SDL_BUTTON_WHEELUP) {
496c504,505
<                     } else if (bev->button == SDL_BUTTON_WHEELDOWN && 
ev->type == SDL_MOUSEBUTTONDOWN) {
---
>                     }
>                     else if (bev->button == SDL_BUTTON_WHEELDOWN) {
498a508,510
>                     else {
>                         state = bev->button | state;
>                     }
500c512
<                     sdl_send_mouse_event(dz);
---
>                     sdl_send_mouse_event(dx, dy, dz, state);
Index: hw/usb-hid.c
===================================================================
RCS file: /sources/qemu/qemu/hw/usb-hid.c,v
retrieving revision 1.16
diff -r1.16 usb-hid.c
386a387,395
> static int currentbutton = 0;
> typedef struct _mouseclick {
>     int button_state;
>     struct _mouseclick *next;
> } mouseclick; 
> static mouseclick mousequeue[20];
> static mouseclick *head = mousequeue;
> static mouseclick *tail = mousequeue;
> 
392a402,414
>     if (hs->changed == 1){
>         //A mouse event is lost
>         if (buttons_state != currentbutton && tail->next != head) {
>             //A left click event is lost: let's add it to the queue
>             //counter++;
>             tail->button_state = buttons_state;
>             tail = tail->next;
>         }
>     }
>     else {
>         s->buttons_state = buttons_state;
>     }
> 
396d417
<     s->buttons_state = buttons_state;
397a419
>     currentbutton = buttons_state;
405a428,440
>     if (hs->changed == 1){
>         //A mouse event is lost
>         if (buttons_state != currentbutton && tail->next != head) {
>             //A left click event is lost: let's add it to the queue
>             //counter++;
>             tail->button_state = buttons_state;
>             tail = tail->next;
>         }
>     }
>     else {
>         s->buttons_state = buttons_state;
>     }
> 
409d443
<     s->buttons_state = buttons_state;
410a445
>     currentbutton = buttons_state;
779c814
<             s->changed = 0;
---
> 
785a821,833
> 
>             if ((s->kind == USB_MOUSE || s->kind == USB_TABLET) && 
> s->changed) {
>                 USBMouseState *ms = &s->ptr;
>                 if (head != tail) {
>                     ms->buttons_state = head->button_state;
>                     head = head->next;
>                 }
>                 else {
>                     s->changed = 0;
>                 }
>             } else {
>                 s->changed = 0;
>             }
810a859
>     int i;
812a862,868
>     for (i = 0; i < 19; i++) {
>         mousequeue[i].button_state = 0;
>         mousequeue[i].next = &(mousequeue[i + 1]);
>     }
>     mousequeue[i].button_state = 0;
>     mousequeue[i].next = mousequeue;
> 
833a890
>     int i;
835a893,899
>     for (i = 0; i < 19; i++) {
>         mousequeue[i].button_state = 0;
>         mousequeue[i].next = &(mousequeue[i + 1]);
>     }
>     mousequeue[i].button_state = 0;
>     mousequeue[i].next = mousequeue;
>