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win32: ensure initial dpi-scale value 

vo_calc_window_geometry2(...) is called to initialize the window
size with the dpi_scale value as one of the arguments.

dpi_scale is 0 initially, and set to a valid value at update_dpi(),
which is called from [force_]update_display_info().

However, no measures were taken to ensure that dpi_scale is set
correctly before vo_calc_window_geometry2() is called, which could
result in incorrect window size if it's not initialized.

It did happen to get initialized on time, by luck, because
VOCTRL_GET_DISPLAY_FPS is used early, which happens to call
update_display_info to read the fps value (other update_display_info()
calls are after the first vo_calc_window_geometry2() call).

This commit ensures that dpi_scale is initialized on time if needed.
Also, update_dpi() now ensures that dpi_scale is never 0.
This commit is contained in:
Avi Halachmi (:avih) 2021-08-09 22:04:29 +03:00 committed by avih
parent 3abb23d70f
commit 19e24bbe86
1 changed files with 19 additions and 14 deletions
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33
video/out/w32_common.c
View File

@ -537,24 +537,26 @@ done:
static void update_dpi(struct vo_w32_state *w32)
{
UINT dpiX, dpiY;
HDC hdc = NULL;
int dpi = 0;
if (w32->api.pGetDpiForMonitor && w32->api.pGetDpiForMonitor(w32->monitor,
MDT_EFFECTIVE_DPI, &dpiX, &dpiY) == S_OK) {
w32->dpi = (int)dpiX;
w32->dpi_scale = w32->opts->hidpi_window_scale ? w32->dpi / 96.0 : 1.0;
MP_VERBOSE(w32, "DPI detected from the new API: %d\n", w32->dpi);
return;
}
HDC hdc = GetDC(NULL);
if (hdc) {
w32->dpi = GetDeviceCaps(hdc, LOGPIXELSX);
w32->dpi_scale = w32->opts->hidpi_window_scale ? w32->dpi / 96.0 : 1.0;
dpi = (int)dpiX;
MP_VERBOSE(w32, "DPI detected from the new API: %d\n", dpi);
} else if ((hdc = GetDC(NULL))) {
dpi = GetDeviceCaps(hdc, LOGPIXELSX);
ReleaseDC(NULL, hdc);
MP_VERBOSE(w32, "DPI detected from the old API: %d\n", w32->dpi);
} else {
w32->dpi = 96;
w32->dpi_scale = 1.0;
MP_VERBOSE(w32, "Couldn't determine DPI, falling back to %d\n", w32->dpi);
MP_VERBOSE(w32, "DPI detected from the old API: %d\n", dpi);
}
if (dpi <= 0) {
dpi = 96;
MP_VERBOSE(w32, "Couldn't determine DPI, falling back to %d\n", dpi);
}
w32->dpi = dpi;
w32->dpi_scale = w32->opts->hidpi_window_scale ? w32->dpi / 96.0 : 1.0;
}
static void update_display_info(struct vo_w32_state *w32)
@ -1420,6 +1422,9 @@ static void gui_thread_reconfig(void *ptr)
struct mp_rect screen = { r.left, r.top, r.right, r.bottom };
struct vo_win_geometry geo;
if (w32->dpi_scale == 0)
force_update_display_info(w32);
vo_calc_window_geometry2(vo, &screen, w32->dpi_scale, &geo);
vo_apply_window_geometry(vo, &geo);