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Fixed bug 1423 - Finger touch events don't report pressure

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Philip Taylor 2012-02-19 08:34:52 PST

SDL_touch.c never actually uses the 'pressurein' arguments to
SDL_SendFingerDown/SDL_SendTouchMotion, so it doesn't report the real pressure.
Also it uses touch->pressureres which is never initialised. Also it fails to
initialise some fields of event.tfinger for certain events, so applications
might try to use bogus data.

The attached patch seems to be enough to produce generally sensible output on
Android.
This commit is contained in:
Sam Lantinga 2012-02-20 23:54:33 -05:00
parent 099dd8f095
commit 721ac5f4d8
1 changed files with 6 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

8
src/events/SDL_touch.c
View file

@ -141,6 +141,7 @@ SDL_AddTouch(const SDL_Touch * touch, char *name)
SDL_touchPads[index]->xres = (1<<(16-1));
SDL_touchPads[index]->yres = (1<<(16-1));
SDL_touchPads[index]->pressureres = (1<<(16-1));
//Do I want this here? Probably
SDL_GestureAddTouch(SDL_touchPads[index]);
@ -329,7 +330,7 @@ SDL_SendFingerDown(SDL_TouchID id, SDL_FingerID fingerid, SDL_bool down,
//scale to Integer coordinates
x = (Uint16)((xin+touch->x_min)*(touch->xres)/(touch->native_xres));
y = (Uint16)((yin+touch->y_min)*(touch->yres)/(touch->native_yres));
pressure = (Uint16)((yin+touch->pressure_min)*(touch->pressureres)/(touch->native_pressureres));
pressure = (Uint16)((pressurein+touch->pressure_min)*(touch->pressureres)/(touch->native_pressureres));
finger = SDL_GetFinger(touch,fingerid);
if(down) {
@ -357,6 +358,8 @@ SDL_SendFingerDown(SDL_TouchID id, SDL_FingerID fingerid, SDL_bool down,
event.tfinger.touchId = id;
event.tfinger.x = x;
event.tfinger.y = y;
event.tfinger.dx = 0;
event.tfinger.dy = 0;
event.tfinger.pressure = pressure;
event.tfinger.state = touch->buttonstate;
event.tfinger.windowID = touch->focus ? touch->focus->id : 0;
@ -384,6 +387,7 @@ SDL_SendFingerDown(SDL_TouchID id, SDL_FingerID fingerid, SDL_bool down,
event.tfinger.y = finger->y;
event.tfinger.dx = 0;
event.tfinger.dy = 0;
event.tfinger.pressure = pressure;
if(SDL_DelFinger(touch,fingerid) < 0) return 0;
posted = (SDL_PushEvent(&event) > 0);
@ -412,7 +416,7 @@ SDL_SendTouchMotion(SDL_TouchID id, SDL_FingerID fingerid, int relative,
//scale to Integer coordinates
x = (Uint16)((xin+touch->x_min)*(touch->xres)/(touch->native_xres));
y = (Uint16)((yin+touch->y_min)*(touch->yres)/(touch->native_yres));
pressure = (Uint16)((yin+touch->pressure_min)*(touch->pressureres)/(touch->native_pressureres));
pressure = (Uint16)((pressurein+touch->pressure_min)*(touch->pressureres)/(touch->native_pressureres));
if(touch->flush_motion) {
return 0;
}