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On Windows the mouse speed is affected by the content scale 

Fixes https://github.com/libsdl-org/SDL/issues/7802
This commit is contained in:
Sam Lantinga 2023-06-29 14:38:26 -07:00
parent 4d23eaf81e
commit ffa146f0bc
1 changed files with 33 additions and 18 deletions
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51
src/events/SDL_mouse.c
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@ -350,7 +350,7 @@ int SDL_SendMouseMotion(Uint64 timestamp, SDL_Window *window, SDL_MouseID mouseI
return SDL_PrivateSendMouseMotion(timestamp, window, mouseID, relative, x, y);
}
static float CalculateSystemScale(SDL_Mouse *mouse, const float *x, const float *y)
static float CalculateSystemScale(SDL_Mouse *mouse, SDL_Window *window, const float *x, const float *y)
{
int i;
int n = mouse->num_system_scale_values;
@ -359,23 +359,38 @@ static float CalculateSystemScale(SDL_Mouse *mouse, const float *x, const float
/* If we're using a single scale value, return that */
if (n == 1) {
return v[0];
}
speed = SDL_sqrtf((*x * *x) + (*y * *y));
for (i = 0; i < (n - 2); i += 2) {
if (speed < v[i + 2]) {
break;
scale = v[0];
} else {
speed = SDL_sqrtf((*x * *x) + (*y * *y));
for (i = 0; i < (n - 2); i += 2) {
if (speed < v[i + 2]) {
break;
}
}
if (i == (n - 2)) {
scale = v[n - 1];
} else if (speed <= v[i]) {
scale = v[i + 1];
} else {
coef = (speed - v[i]) / (v[i + 2] - v[i]);
scale = v[i + 1] + (coef * (v[i + 3] - v[i + 1]));
}
}
if (i == (n - 2)) {
scale = v[n - 1];
} else if (speed <= v[i]) {
scale = v[i + 1];
} else {
coef = (speed - v[i]) / (v[i + 2] - v[i]);
scale = v[i + 1] + (coef * (v[i + 3] - v[i + 1]));
#ifdef __WIN32__
{
/* On Windows the mouse speed is affected by the content scale */
SDL_VideoDisplay *display;
if (window) {
display = SDL_GetVideoDisplayForWindow(window);
} else {
display = SDL_GetVideoDisplay(SDL_GetPrimaryDisplay());
}
if (display) {
scale *= display->content_scale;
}
}
#endif
return scale;
}
@ -421,14 +436,14 @@ int SDL_SetMouseSystemScale(int num_values, const float *values)
return 0;
}
static void GetScaledMouseDeltas(SDL_Mouse *mouse, float *x, float *y)
static void GetScaledMouseDeltas(SDL_Mouse *mouse, SDL_Window *window, float *x, float *y)
{
if (mouse->relative_mode) {
if (mouse->enable_relative_speed_scale) {
*x *= mouse->relative_speed_scale;
*y *= mouse->relative_speed_scale;
} else if (mouse->enable_relative_system_scale && mouse->num_system_scale_values > 0) {
float relative_system_scale = CalculateSystemScale(mouse, x, y);
float relative_system_scale = CalculateSystemScale(mouse, window, x, y);
*x *= relative_system_scale;
*y *= relative_system_scale;
}
@ -529,7 +544,7 @@ static int SDL_PrivateSendMouseMotion(Uint64 timestamp, SDL_Window *window, SDL_
}
if (relative) {
GetScaledMouseDeltas(mouse, &x, &y);
GetScaledMouseDeltas(mouse, window, &x, &y);
xrel = x;
yrel = y;
x = (mouse->last_x + xrel);