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Add SDL_GetDisplayDPI implementation on Emscripten 

Signed-off-by: Mahyar Koshkouei <mk@deltabeard.com>
This commit is contained in:
Mahyar Koshkouei 2022-03-06 23:02:57 +00:00 committed by Ryan C. Gordon
parent f03215bc70
commit 41e7d1baa6
1 changed files with 23 additions and 0 deletions
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23
src/video/emscripten/SDL_emscriptenvideo.c
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@ -43,6 +43,7 @@ static int Emscripten_VideoInit(_THIS);
static int Emscripten_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
static void Emscripten_VideoQuit(_THIS);
static int Emscripten_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect);
static int Emscripten_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi, float * hdpi, float * vdpi);
static int Emscripten_CreateWindow(_THIS, SDL_Window * window);
static void Emscripten_SetWindowSize(_THIS, SDL_Window * window);
@ -82,6 +83,7 @@ Emscripten_CreateDevice(int devindex)
device->VideoInit = Emscripten_VideoInit;
device->VideoQuit = Emscripten_VideoQuit;
device->GetDisplayUsableBounds = Emscripten_GetDisplayUsableBounds;
device->GetDisplayDPI = Emscripten_GetDisplayDPI;
device->SetDisplayMode = Emscripten_SetDisplayMode;
@ -182,6 +184,27 @@ Emscripten_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect *
return 0;
}
static int
Emscripten_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi_out, float * hdpi_out, float * vdpi_out)
{
const float dpi_reference = 96.0f;
float dpi;
dpi = (float)emscripten_get_device_pixel_ratio() * dpi_reference;
if (ddpi_out) {
*ddpi_out = dpi;
}
if (hdpi_out) {
*hdpi_out = dpi;
}
if (vdpi_out) {
*vdpi_out = dpi;
}
return 0;
}
static void
Emscripten_PumpEvents(_THIS)
{