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SDL_windowsvideo.c: add HIGHDPI_DEBUG ifdef, print DPI awareness at startup if defined 

document some additional quirks
This commit is contained in:
Eric Wasylishen 2022-06-05 12:36:58 -06:00 committed by Sam Lantinga
parent 1488c40812
commit 1b797957c1
1 changed files with 45 additions and 2 deletions
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45
src/video/windows/SDL_windowsvideo.c
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@ -35,6 +35,8 @@
#include "SDL_windowsshape.h"
#include "SDL_windowsvulkan.h"
/* #define HIGHDPI_DEBUG */
/* Initialization/Query functions */
static int WIN_VideoInit(_THIS);
static void WIN_VideoQuit(_THIS);
@ -304,7 +306,20 @@ WIN_DeclareDPIAwarePerMonitorV2(_THIS)
/* Windows 10, version 1607 */
/* NOTE: SetThreadDpiAwarenessContext doesn't work here with OpenGL - the OpenGL contents
end up still getting OS scaled. (tested on Windows 10 21H1 19043.1348, NVIDIA 496.49) */
end up still getting OS scaled. (tested on Windows 10 21H1 19043.1348, NVIDIA 496.49)
NOTE: Enabling DPI awareness through Windows Explorer
(right click .exe -> Properties -> Compatibility -> High DPI Settings ->
check "Override high DPI Scaling behaviour", select Application) gives
a DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE context (at least on Windows 10 21H1), and
setting DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 will fail.
NOTE: Entering exclusive fullscreen in a DPI_AWARENESS_CONTEXT_UNAWARE process
appears to cause Windows to change the .exe manifest to DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE
on future launches. This means attempting to use DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2
will fail in the future until you manually clear the "Override high DPI Scaling behaviour"
setting in Windows Explorer (tested on Windows 10 21H2).
*/
if (data->SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2)) {
return TRUE;
} else {
@ -316,6 +331,30 @@ WIN_DeclareDPIAwarePerMonitorV2(_THIS)
}
}
static const char*
WIN_GetDPIAwareness(_THIS)
{
SDL_VideoData* data = (SDL_VideoData*)_this->driverdata;
if (data->GetThreadDpiAwarenessContext && data->AreDpiAwarenessContextsEqual) {
DPI_AWARENESS_CONTEXT context = data->GetThreadDpiAwarenessContext();
if (data->AreDpiAwarenessContextsEqual(context, DPI_AWARENESS_CONTEXT_UNAWARE)) {
return "unaware";
} else if (data->AreDpiAwarenessContextsEqual(context, DPI_AWARENESS_CONTEXT_SYSTEM_AWARE)) {
return "system";
} else if (data->AreDpiAwarenessContextsEqual(context, DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE)) {
return "permonitor";
} else if (data->AreDpiAwarenessContextsEqual(context, DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2)) {
return "permonitorv2";
} else if (data->AreDpiAwarenessContextsEqual(context, DPI_AWARENESS_CONTEXT_UNAWARE_GDISCALED)) {
return "unaware_gdiscaled";
}
}
return "";
}
static void
WIN_InitDPIAwareness(_THIS)
{
@ -341,6 +380,10 @@ WIN_VideoInit(_THIS)
WIN_InitDPIAwareness(_this);
#ifdef HIGHDPI_DEBUG
SDL_Log("DPI awareness: %s", WIN_GetDPIAwareness(_this));
#endif
if (WIN_InitModes(_this) < 0) {
return -1;
}