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Removed SDL_GetDisplayDPI()

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This function wasn't consistently correct across platforms and devices.

If you want the UI scale factor, you can use display_scale in the structure returned by SDL_GetDesktopDisplayMode(). If you need an approximate DPI, you can multiply this value times 160 on iPhone and Android, and 96 on other platforms.
This commit is contained in:
Sam Lantinga
2023-02-08 15:07:13 -08:00
parent b7c6fec10a
commit 824b9b0a58
28 changed files with 32 additions and 542 deletions
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22
src/video/emscripten/SDL_emscriptenvideo.c
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@@ -39,7 +39,6 @@ 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_GetDisplayPhysicalDPI(_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);
@@ -77,7 +76,6 @@ static SDL_VideoDevice *Emscripten_CreateDevice(void)
device->VideoInit = Emscripten_VideoInit;
device->VideoQuit = Emscripten_VideoQuit;
device->GetDisplayUsableBounds = Emscripten_GetDisplayUsableBounds;
device->GetDisplayPhysicalDPI = Emscripten_GetDisplayPhysicalDPI;
device->SetDisplayMode = Emscripten_SetDisplayMode;
device->PumpEvents = Emscripten_PumpEvents;
@@ -168,26 +166,6 @@ static int Emscripten_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay *display, S
return 0;
}
static int Emscripten_GetDisplayPhysicalDPI(_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)
{
/* do nothing. */