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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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30
include/SDL_hints.h
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@ -1808,6 +1808,36 @@ extern "C" {
*/
#define SDL_HINT_WINDOWS_USE_D3D9EX "SDL_WINDOWS_USE_D3D9EX"
/**
* \brief Controls whether SDL will declare the process to be DPI aware.
*
* This hint must be set before initializing the video subsystem.
*
* The main purpose of declaring DPI awareness is to disable OS bitmap scaling of SDL windows on monitors with
* a DPI scale factor.
*
* This hint is equivalent to requesting DPI awareness via external means (e.g. calling SetProcessDpiAwarenessContext)
* and does not cause SDL to use a virtualized coordinate system, so it will generally give you 1 SDL coordinate = 1 pixel
* even on high-DPI displays.
*
* For more information, see:
* https://docs.microsoft.com/en-us/windows/win32/hidpi/high-dpi-desktop-application-development-on-windows
*
* This variable can be set to the following values:
* "" - Do not change the DPI awareness (default).
* "unaware" - Declare the process as DPI unaware. (Windows 8.1 and later).
* "system" - Request system DPI awareness. (Vista and later).
* "permonitor" - Request per-monitor DPI awareness. (Windows 8.1 and later).
* "permonitorv2" - Request per-monitor V2 DPI awareness. (Windows 10, version 1607 and later).
* The most visible difference from "permonitor" is that window title bar will be scaled
* to the visually correct size when dragging between monitors with different scale factors.
* This is the preferred DPI awareness level.
*
* If the requested DPI awareness is not available on the currently running OS, SDL will try to request the best
* available match.
*/
#define SDL_HINT_WINDOWS_DPI_AWARENESS "SDL_WINDOWS_DPI_AWARENESS"
/**
* \brief A variable controlling whether the window frame and title bar are interactive when the cursor is hidden
*