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Mouse coordinates are floating point

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You can get sub-pixel mouse coordinates and motion depending on the platform and display scaling.

Fixes https://github.com/libsdl-org/SDL/issues/2999
This commit is contained in:
Sam Lantinga
2022-12-29 19:31:12 -08:00
parent 8c3239dee5
commit cefbeb582f
52 changed files with 564 additions and 654 deletions
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28
src/video/windows/SDL_windowswindow.c
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@@ -1357,6 +1357,20 @@ void WIN_ClientPointToSDL(const SDL_Window *window, int *x, int *y)
*y = MulDiv(*y, 96, data->scaling_dpi);
}
void WIN_ClientPointToSDLFloat(const SDL_Window *window, LONG x, LONG y, float *xOut, float *yOut)
{
const SDL_WindowData *data = ((SDL_WindowData *)window->driverdata);
const SDL_VideoData *videodata = data->videodata;
if (videodata->dpi_scaling_enabled) {
*xOut = (float)(x * 96) / data->scaling_dpi;
*yOut = (float)(y * 96) / data->scaling_dpi;
} else {
*xOut = (float)x;
*yOut = (float)y;
}
}
/**
* Convert a point in the client area from DPI-scaled points to pixels.
*
@@ -1375,6 +1389,20 @@ void WIN_ClientPointFromSDL(const SDL_Window *window, int *x, int *y)
*y = MulDiv(*y, data->scaling_dpi, 96);
}
void WIN_ClientPointFromSDLFloat(const SDL_Window *window, float x, float y, LONG *xOut, LONG *yOut)
{
const SDL_WindowData *data = ((SDL_WindowData *)window->driverdata);
const SDL_VideoData *videodata = data->videodata;
if (videodata->dpi_scaling_enabled) {
*xOut = (LONG)SDL_roundf((x * data->scaling_dpi) / 96.0f);
*yOut = (LONG)SDL_roundf((y * data->scaling_dpi) / 96.0f);
} else {
*xOut = (LONG)SDL_roundf(x);
*yOut = (LONG)SDL_roundf(y);
}
}
#if !defined(__XBOXONE__) && !defined(__XBOXSERIES__)
void WIN_AcceptDragAndDrop(SDL_Window *window, SDL_bool accept)
{