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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 6ff55c1ca2
commit 2f440f0b3b
1 changed files with 6 additions and 2 deletions
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8
src/events/SDL_touch.c
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@@ -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;
}