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wayland: Fix scaled cursor image selection

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When the pointer isn't being scaled, make sure the cursor scale factor is set to that of the window to avoid blurry cursors on high-DPI desktops, and use the inverse of the pointer scale value when selecting buffers for size-adjusted cursors. Fixes a regression from adjusting custom cursor sizes when using scale to display mode, and ensures that the best buffer size for the scaled cursor is always selected.

(cherry picked from commit 03f1a84302)
This commit is contained in:
Frank Praznik
2026-04-19 23:18:12 -04:00
parent 447ba0aa01
commit aadc6724d8
1 changed files with 20 additions and 6 deletions
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26
src/video/wayland/SDL_waylandmouse.c
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@@ -1104,13 +1104,27 @@ static void Wayland_CursorStateSetCursor(SDL_WaylandCursorState *state, const Wa
dst_height = dst_width;
} else {
/* If viewports aren't available, the scale is always 1.0.
* The dimensions are scaled by the pointer scale, so custom cursors will be scaled relative to the window size.
*
* If the pointer scale values are 1.0, the preferred backing buffer scale is the window scale.
*
* If the pointer is scaled, the dimensions are scaled by the pointer scale, so custom cursors will be scaled
* relative to the viewport size.
*/
state->scale = viddata->viewporter && focus ? SDL_min(focus->pointer_scale.x, focus->pointer_scale.y) : 1.0;
dst_width = SDL_max((int)SDL_lround((double)cursor_data->cursor_data.custom.width / state->scale), 1);
dst_height = SDL_max((int)SDL_lround((double)cursor_data->cursor_data.custom.height / state->scale), 1);
hot_x = (int)SDL_lround((double)cursor_data->cursor_data.custom.hot_x / state->scale);
hot_y = (int)SDL_lround((double)cursor_data->cursor_data.custom.hot_y / state->scale);
if (!focus || (focus->pointer_scale.x == 1.0 && focus->pointer_scale.y == 1.0)) {
state->scale = viddata->viewporter && focus ? focus->scale_factor : 1.0;
dst_width = cursor_data->cursor_data.custom.width;
dst_height = cursor_data->cursor_data.custom.height;
hot_x = cursor_data->cursor_data.custom.hot_x;
hot_y = cursor_data->cursor_data.custom.hot_y;
} else {
// The preferred buffer scale is the inverse of the pointer scale.
state->scale = 1.0 / SDL_min(focus->pointer_scale.x, focus->pointer_scale.y);
dst_width = SDL_max((int)SDL_lround((double)cursor_data->cursor_data.custom.width / focus->pointer_scale.x), 1);
dst_height = SDL_max((int)SDL_lround((double)cursor_data->cursor_data.custom.height / focus->pointer_scale.y), 1);
hot_x = (int)SDL_lround((double)cursor_data->cursor_data.custom.hot_x / focus->pointer_scale.x);
hot_y = (int)SDL_lround((double)cursor_data->cursor_data.custom.hot_y / focus->pointer_scale.y);
}
}
state->current_cursor = cursor_data;