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Fixed touch normalized coordinates

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When converting normalized coordinates to pixel coordinates, the valid range is 0 to (width or height) - 1, and the pixel coordinate of width or height is past the edge of the window.

Fixes https://github.com/libsdl-org/SDL/issues/2913
This commit is contained in:
Sam Lantinga 2023-11-05 00:03:23 -07:00
parent ff3c20a799
commit 9302d7732d
6 changed files with 72 additions and 16 deletions
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30
android-project/app/src/main/java/org/libsdl/app/SDLSurface.java
View File

@ -196,6 +196,24 @@ public class SDLSurface extends SurfaceView implements SurfaceHolder.Callback,
return SDLActivity.handleKeyEvent(v, keyCode, event, null);
}
private float getNormalizedX(float x)
{
if (mWidth <= 1) {
return 0.5f;
} else {
return (x / (mWidth - 1));
}
}
private float getNormalizedY(float y)
{
if (mHeight <= 1) {
return 0.5f;
} else {
return (y / (mHeight - 1));
}
}
// Touch events
@Override
public boolean onTouch(View v, MotionEvent event) {
@ -242,8 +260,8 @@ public class SDLSurface extends SurfaceView implements SurfaceHolder.Callback,
case MotionEvent.ACTION_MOVE:
for (i = 0; i < pointerCount; i++) {
pointerFingerId = event.getPointerId(i);
x = event.getX(i) / mWidth;
y = event.getY(i) / mHeight;
x = getNormalizedX(event.getX(i));
y = getNormalizedY(event.getY(i));
p = event.getPressure(i);
if (p > 1.0f) {
// may be larger than 1.0f on some devices
@ -267,8 +285,8 @@ public class SDLSurface extends SurfaceView implements SurfaceHolder.Callback,
}
pointerFingerId = event.getPointerId(i);
x = event.getX(i) / mWidth;
y = event.getY(i) / mHeight;
x = getNormalizedX(event.getX(i));
y = getNormalizedY(event.getY(i));
p = event.getPressure(i);
if (p > 1.0f) {
// may be larger than 1.0f on some devices
@ -281,8 +299,8 @@ public class SDLSurface extends SurfaceView implements SurfaceHolder.Callback,
case MotionEvent.ACTION_CANCEL:
for (i = 0; i < pointerCount; i++) {
pointerFingerId = event.getPointerId(i);
x = event.getX(i) / mWidth;
y = event.getY(i) / mHeight;
x = getNormalizedX(event.getX(i));
y = getNormalizedY(event.getY(i));
p = event.getPressure(i);
if (p > 1.0f) {
// may be larger than 1.0f on some devices

12
src/video/emscripten/SDL_emscriptenevents.c
View File

@ -759,8 +759,16 @@ static EM_BOOL Emscripten_HandleTouch(int eventType, const EmscriptenTouchEvent
}
id = touchEvent->touches[i].identifier;
x = touchEvent->touches[i].targetX / client_w;
y = touchEvent->touches[i].targetY / client_h;
if (client_w <= 1) {
x = 0.5f;
} else {
x = touchEvent->touches[i].targetX / (client_w - 1);
}
if (client_h <= 1) {
y = 0.5f;
} else {
y = touchEvent->touches[i].targetY / (client_h - 1);
}
if (eventType == EMSCRIPTEN_EVENT_TOUCHSTART) {
SDL_SendTouch(0, deviceId, id, window_data->window, SDL_TRUE, x, y, 1.0f);

4
src/video/n3ds/SDL_n3dstouch.c
View File

@ -36,8 +36,8 @@
internally in a portrait disposition so the
GSP_SCREEN constants are flipped.
*/
#define TOUCHSCREEN_SCALE_X 1.0f / GSP_SCREEN_HEIGHT_BOTTOM
#define TOUCHSCREEN_SCALE_Y 1.0f / GSP_SCREEN_WIDTH
#define TOUCHSCREEN_SCALE_X 1.0f / (GSP_SCREEN_HEIGHT_BOTTOM - 1)
#define TOUCHSCREEN_SCALE_Y 1.0f / (GSP_SCREEN_WIDTH - 1)
void N3DS_InitTouch(void)
{

14
src/video/vita/SDL_vitatouch.c
View File

@ -173,8 +173,18 @@ void VITA_PollTouch(void)
void VITA_ConvertTouchXYToSDLXY(float *sdl_x, float *sdl_y, int vita_x, int vita_y, int port)
{
float x = (vita_x - area_info[port].x) / area_info[port].w;
float y = (vita_y - area_info[port].y) / area_info[port].h;
float x, y;
if (area_info[port].w <= 1) {
x = 0.5f;
} else {
x = (vita_x - area_info[port].x) / (area_info[port].w - 1);
}
if (area_info[port].h <= 1) {
y = 0.5f;
} else {
y = (vita_y - area_info[port].y) / (area_info[port].h - 1);
}
x = SDL_max(x, 0.0);
x = SDL_min(x, 1.0);

14
src/video/wayland/SDL_waylandevents.c
View File

@ -953,8 +953,18 @@ static void touch_handler_down(void *data, struct wl_touch *touch, uint32_t seri
window_data = (SDL_WindowData *)wl_surface_get_user_data(surface);
if (window_data) {
const float x = wl_fixed_to_double(fx) / window_data->wl_window_width;
const float y = wl_fixed_to_double(fy) / window_data->wl_window_height;
float x, y;
if (window_data->wl_window_width <= 1) {
x = 0.5f;
} else {
x = wl_fixed_to_double(fx) / (window_data->wl_window_width - 1);
}
if (window_data->wl_window_height <= 1) {
y = 0.5f;
} else {
y = wl_fixed_to_double(fy) / (window_data->wl_window_height - 1);
}
SDL_SendTouch(Wayland_GetTouchTimestamp(input, timestamp), (SDL_TouchID)(intptr_t)touch,
(SDL_FingerID)id, window_data->sdlwindow, SDL_TRUE, x, y, 1.0f);

14
src/video/windows/SDL_windowsevents.c
View File

@ -1419,6 +1419,8 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
for (i = 0; i < num_inputs; ++i) {
PTOUCHINPUT input = &inputs[i];
const int w = (rect.right - rect.left);
const int h = (rect.right - rect.left);
const SDL_TouchID touchId = (SDL_TouchID)((size_t)input->hSource);
@ -1430,8 +1432,16 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
}
/* Get the normalized coordinates for the window */
x = (float)(input->x - rect.left) / (rect.right - rect.left);
y = (float)(input->y - rect.top) / (rect.bottom - rect.top);
if (w <= 1) {
x = 0.5f;
} else {
x = (float)(input->x - rect.left) / (w - 1);
}
if (h <= 1) {
y = 0.5f;
} else {
y = (float)(input->y - rect.top) / (h - 1);
}
/* FIXME: Should we use the input->dwTime field for the tick source of the timestamp? */
if (input->dwFlags & TOUCHEVENTF_DOWN) {