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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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12
src/render/direct3d/SDL_render_d3d.c
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@@ -308,7 +308,7 @@ D3D_ActivateRenderer(SDL_Renderer * renderer)
int w, h;
Uint32 window_flags = SDL_GetWindowFlags(window);
SDL_GetWindowSize(window, &w, &h);
WIN_GetDrawableSize(window, &w, &h);
data->pparams.BackBufferWidth = w;
data->pparams.BackBufferHeight = h;
if (window_flags & SDL_WINDOW_FULLSCREEN && (window_flags & SDL_WINDOW_FULLSCREEN_DESKTOP) != SDL_WINDOW_FULLSCREEN_DESKTOP) {
@@ -354,6 +354,13 @@ D3D_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
}
}
static int
D3D_GetOutputSize(SDL_Renderer * renderer, int *w, int *h)
{
WIN_GetDrawableSize(renderer->window, w, h);
return 0;
}
static D3DBLEND
GetBlendFunc(SDL_BlendFactor factor)
{
@@ -1616,6 +1623,7 @@ D3D_CreateRenderer(SDL_Window * window, Uint32 flags)
}
renderer->WindowEvent = D3D_WindowEvent;
renderer->GetOutputSize = D3D_GetOutputSize;
renderer->SupportsBlendMode = D3D_SupportsBlendMode;
renderer->CreateTexture = D3D_CreateTexture;
renderer->UpdateTexture = D3D_UpdateTexture;
@@ -1645,7 +1653,7 @@ D3D_CreateRenderer(SDL_Window * window, Uint32 flags)
SDL_GetWindowWMInfo(window, &windowinfo);
window_flags = SDL_GetWindowFlags(window);
SDL_GetWindowSize(window, &w, &h);
WIN_GetDrawableSize(window, &w, &h);
SDL_GetWindowDisplayMode(window, &fullscreen_mode);
SDL_zero(pparams);