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wayland: Round fractional backbuffer sizes halfway away from zero 

Use SDL_lroundf() to round fractional backbuffer sizes halfway away from zero, as this is the rounding method recommended by the forthcoming Wayland fractional scaling protocol.
This commit is contained in:
Frank Praznik 2022-06-21 13:28:14 -04:00 committed by Ethan Lee
parent ff735b3c0f
commit c11bdeeb69
1 changed files with 5 additions and 4 deletions
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9
src/video/wayland/SDL_waylandwindow.c
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@ -184,8 +184,9 @@ GetBufferSize(SDL_Window *window, int *width, int *height)
if (FullscreenModeEmulation(window)) { if (FullscreenModeEmulation(window)) {
GetFullScreenDimensions(window, NULL, NULL, &buf_width, &buf_height); GetFullScreenDimensions(window, NULL, NULL, &buf_width, &buf_height);
} else if (NeedViewport(window)) { } else if (NeedViewport(window)) {
buf_width = (int)SDL_ceil(window->w * data->scale_factor); /* Round fractional backbuffer sizes halfway away from zero. */
buf_height = (int)SDL_ceil(window->h * data->scale_factor); buf_width = (int)SDL_lroundf(window->w * data->scale_factor);
buf_height = (int)SDL_lroundf(window->h * data->scale_factor);
} else { } else {
/* /*
* Integer scaled windowed or fullscreen with no viewport * Integer scaled windowed or fullscreen with no viewport
@ -1897,8 +1898,8 @@ int Wayland_CreateWindow(_THIS, SDL_Window *window)
} }
#endif /* SDL_VIDEO_DRIVER_WAYLAND_QT_TOUCH */ #endif /* SDL_VIDEO_DRIVER_WAYLAND_QT_TOUCH */
data->drawable_width = SDL_ceilf(window->w * data->scale_factor); data->drawable_width = SDL_lroundf(window->w * data->scale_factor);
data->drawable_height = SDL_ceilf(window->h * data->scale_factor); data->drawable_height = SDL_lroundf(window->h * data->scale_factor);
if (window->flags & SDL_WINDOW_OPENGL) { if (window->flags & SDL_WINDOW_OPENGL) {
data->egl_window = WAYLAND_wl_egl_window_create(data->surface, data->drawable_width, data->drawable_height); data->egl_window = WAYLAND_wl_egl_window_create(data->surface, data->drawable_width, data->drawable_height);