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WindowInfo: Add surface_scale field

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This commit is contained in:
Connor McLaughlin
2020-07-01 00:35:19 +10:00
parent e374853cf5
commit bf08385051
7 changed files with 38 additions and 35 deletions
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31
src/duckstation-sdl/sdl_util.cpp
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@ -32,6 +32,7 @@ std::optional<WindowInfo> GetWindowInfoForSDLWindow(SDL_Window* window)
WindowInfo wi;
wi.surface_width = static_cast<u32>(window_width);
wi.surface_height = static_cast<u32>(window_height);
wi.surface_scale = GetDPIScaleFactor(window);
wi.surface_format = WindowInfo::SurfaceFormat::RGB8;
switch (syswm.subsystem)
@ -65,4 +66,34 @@ std::optional<WindowInfo> GetWindowInfoForSDLWindow(SDL_Window* window)
return wi;
}
float GetDPIScaleFactor(SDL_Window* window)
{
#ifdef __APPLE__
static constexpr float DEFAULT_DPI = 72.0f;
#else
static constexpr float DEFAULT_DPI = 96.0f;
#endif
if (!window)
{
SDL_Window* dummy_window = SDL_CreateWindow("", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 1, 1,
SDL_WINDOW_ALLOW_HIGHDPI | SDL_WINDOW_HIDDEN);
if (!dummy_window)
return 1.0f;
const float scale = GetDPIScaleFactor(dummy_window);
SDL_DestroyWindow(dummy_window);
return scale;
}
int display_index = SDL_GetWindowDisplayIndex(window);
float display_dpi = DEFAULT_DPI;
if (SDL_GetDisplayDPI(display_index, &display_dpi, nullptr, nullptr) != 0)
return 1.0f;
return display_dpi / DEFAULT_DPI;
}
} // namespace SDLUtil