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Windows DPI scaling/highdpi support

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Adds hint "SDL_WINDOWS_DPI_SCALING" which can be set to "1" to
change the SDL coordinate system units to be DPI-scaled points, rather
than pixels everywhere.

This means windows will be appropriately sized, even when created on
high-DPI displays with scaling.

e.g. requesting a 640x480 window from SDL, on a display with 125%
scaling in Windows display settings, will create a window with an
800x600 client area (in pixels).

Setting this to "1" implicitly requests process DPI awareness
(setting SDL_WINDOWS_DPI_AWARENESS is unnecessary),
and forces SDL_WINDOW_ALLOW_HIGHDPI on all windows.
This commit is contained in:
Eric Wasylishen
2022-06-07 02:01:27 -06:00
committed by Sam Lantinga
parent df36f926fc
commit ab81a559f4
16 changed files with 624 additions and 34 deletions
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11
src/render/direct3d11/SDL_render_d3d11.c
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@@ -27,6 +27,7 @@
#define COBJMACROS
#include "../../core/windows/SDL_windows.h"
#include "../../video/windows/SDL_windowswindow.h"
#include "SDL_hints.h"
#include "SDL_loadso.h"
#include "SDL_syswm.h"
@@ -910,7 +911,7 @@ D3D11_CreateWindowSizeDependentResources(SDL_Renderer * renderer)
/* The width and height of the swap chain must be based on the display's
* non-rotated size.
*/
SDL_GetWindowSize(renderer->window, &w, &h);
WIN_GetDrawableSize(renderer->window, &w, &h);
data->rotation = D3D11_GetCurrentRotation();
/* SDL_Log("%s: windowSize={%d,%d}, orientation=%d\n", __FUNCTION__, w, h, (int)data->rotation); */
if (D3D11_IsDisplayRotated90Degrees(data->rotation)) {
@@ -1051,6 +1052,13 @@ D3D11_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
}
}
static int
D3D11_GetOutputSize(SDL_Renderer * renderer, int *w, int *h)
{
WIN_GetDrawableSize(renderer->window, w, h);
return 0;
}
static SDL_bool
D3D11_SupportsBlendMode(SDL_Renderer * renderer, SDL_BlendMode blendMode)
{
@@ -2366,6 +2374,7 @@ D3D11_CreateRenderer(SDL_Window * window, Uint32 flags)
data->identity = MatrixIdentity();
renderer->WindowEvent = D3D11_WindowEvent;
renderer->GetOutputSize = D3D11_GetOutputSize;
renderer->SupportsBlendMode = D3D11_SupportsBlendMode;
renderer->CreateTexture = D3D11_CreateTexture;
renderer->UpdateTexture = D3D11_UpdateTexture;