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Support PMv2 DPI awareness, add SDL_HINT_WINDOWS_DPI_AWARENESS

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The hint allows setting a specific DPI awareness ("unaware", "system", "permonitor", "permonitorv2").

This is the first part of High-DPI support on Windows ( https://github.com/libsdl-org/SDL/issues/2119 ).
It doesn't implement a virtualized SDL coordinate system, which will be
addressed in a later commit. (This hint could be useful for SDL apps
that want 1 SDL unit = 1 pixel, though.)

Detecting and behaving correctly under per-monitor V2
(calling AdjustWindowRectExForDpi where needed) should fix the
following issues:

https://github.com/libsdl-org/SDL/issues/3286
https://github.com/libsdl-org/SDL/issues/4712
This commit is contained in:
Eric Wasylishen
2022-02-28 00:43:43 -07:00
committed by Sam Lantinga
parent 81d3adddbf
commit 51ebefeeee
5 changed files with 376 additions and 8 deletions
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57
src/video/windows/SDL_windowswindow.c
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@@ -114,8 +114,11 @@ GetWindowStyle(SDL_Window * window)
}
static void
WIN_AdjustWindowRectWithStyle(SDL_Window *window, DWORD style, BOOL menu, int *x, int *y, int *width, int *height, SDL_bool use_current)
WIN_AdjustWindowRectWithStyle(SDL_Window *window, DWORD style, BOOL menu, int *x, int *y, int *width, int *height, SDL_bool use_current,
SDL_bool force_ignore_window_dpi)
{
SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
SDL_VideoData* videodata = SDL_GetVideoDevice() ? SDL_GetVideoDevice()->driverdata : NULL;
RECT rect;
rect.left = 0;
@@ -126,8 +129,44 @@ WIN_AdjustWindowRectWithStyle(SDL_Window *window, DWORD style, BOOL menu, int *x
/* borderless windows will have WM_NCCALCSIZE return 0 for the non-client area. When this happens, it looks like windows will send a resize message
expanding the window client area to the previous window + chrome size, so shouldn't need to adjust the window size for the set styles.
*/
if (!(window->flags & SDL_WINDOW_BORDERLESS))
AdjustWindowRectEx(&rect, style, menu, 0);
if (!(window->flags & SDL_WINDOW_BORDERLESS)) {
if (WIN_IsPerMonitorV2DPIAware(SDL_GetVideoDevice())) {
/* With per-monitor v2, the window border/titlebar size depend on the DPI, so we need to call AdjustWindowRectExForDpi instead of
AdjustWindowRectEx. */
UINT dpi;
if (data && !force_ignore_window_dpi) {
/* The usual case - we have a HWND, so we can look up the DPI to use. */
dpi = videodata->GetDpiForWindow(data->hwnd);
} else {
/* In this case we guess the window DPI based on its rectangle on the screen.
This happens at creation time of an SDL window, before we have a HWND,
and also in a bug workaround (when force_ignore_window_dpi is SDL_TRUE
- see WIN_SetWindowFullscreen).
*/
UINT unused;
RECT screen_rect;
HMONITOR mon;
screen_rect.left = (use_current ? window->x : window->windowed.x);
screen_rect.top = (use_current ? window->y : window->windowed.y);
screen_rect.right = screen_rect.left + (use_current ? window->w : window->windowed.w);
screen_rect.bottom = screen_rect.top + (use_current ? window->h : window->windowed.h);
mon = MonitorFromRect(&screen_rect, MONITOR_DEFAULTTONEAREST);
/* GetDpiForMonitor docs promise to return the same hdpi / vdpi */
if (videodata->GetDpiForMonitor(mon, MDT_EFFECTIVE_DPI, &dpi, &unused) != S_OK) {
dpi = 96;
}
}
videodata->AdjustWindowRectExForDpi(&rect, style, menu, 0, dpi);
} else {
AdjustWindowRectEx(&rect, style, menu, 0);
}
}
*x = (use_current ? window->x : window->windowed.x) + rect.left;
*y = (use_current ? window->y : window->windowed.y) + rect.top;
@@ -145,7 +184,7 @@ WIN_AdjustWindowRect(SDL_Window *window, int *x, int *y, int *width, int *height
style = GetWindowLong(hwnd, GWL_STYLE);
menu = (style & WS_CHILDWINDOW) ? FALSE : (GetMenu(hwnd) != NULL);
WIN_AdjustWindowRectWithStyle(window, style, menu, x, y, width, height, use_current);
WIN_AdjustWindowRectWithStyle(window, style, menu, x, y, width, height, use_current, SDL_FALSE);
}
static void
@@ -356,7 +395,7 @@ WIN_CreateWindow(_THIS, SDL_Window * window)
style |= GetWindowStyle(window);
/* Figure out what the window area will be */
WIN_AdjustWindowRectWithStyle(window, style, FALSE, &x, &y, &w, &h, SDL_FALSE);
WIN_AdjustWindowRectWithStyle(window, style, FALSE, &x, &y, &w, &h, SDL_FALSE, SDL_FALSE);
hwnd =
CreateWindow(SDL_Appname, TEXT(""), style, x, y, w, h, parent, NULL,
@@ -781,7 +820,13 @@ WIN_SetWindowFullscreen(_THIS, SDL_Window * window, SDL_VideoDisplay * display,
}
menu = (style & WS_CHILDWINDOW) ? FALSE : (GetMenu(hwnd) != NULL);
WIN_AdjustWindowRectWithStyle(window, style, menu, &x, &y, &w, &h, SDL_FALSE);
/* HighDPI bug workaround - when leaving exclusive fullscreen, the window DPI reported
by GetDpiForWindow will be wrong. Pass SDL_TRUE for `force_ignore_window_dpi`
makes us recompute the DPI based on the monitor we are restoring onto.
Fixes windows shrinking slightly when going from exclusive fullscreen to windowed
on a HighDPI monitor with scaling.
*/
WIN_AdjustWindowRectWithStyle(window, style, menu, &x, &y, &w, &h, SDL_FALSE, SDL_TRUE);
}
SetWindowLong(hwnd, GWL_STYLE, style);
data->expected_resize = SDL_TRUE;