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Fixed bug 4883 - Add approximation for display DPI on iOS

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Aaron Barany

There appears to be no way to directly access the display DPI on iOS, so as an approximation the DPI for the iPhone 1 is used as a base value and is multiplied by the screen's scale. This should at least give a ballpark number for the various screen scales. (based on https://stackoverflow.com/questions/25756087/detecting-iphone-6-6-screen-sizes-in-point-values it appears that both 2x and 3x are used)

I have updated the patch to use a table of current devices and use a computation as a fallback. I have also updated the fallback computation to be more accurate.
This commit is contained in:
Sam Lantinga 2019-12-08 11:36:40 -08:00
parent 9c591a8538
commit 91b24c357b
2 changed files with 167 additions and 3 deletions
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4
src/video/uikit/SDL_uikitmodes.h
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@ -27,7 +27,10 @@
@interface SDL_DisplayData : NSObject
- (instancetype)init;
@property (nonatomic, strong) UIScreen *uiscreen;
@property (nonatomic) float screenDPI;
@end
@ -41,6 +44,7 @@ extern SDL_bool UIKit_IsDisplayLandscape(UIScreen *uiscreen);
extern int UIKit_InitModes(_THIS);
extern void UIKit_GetDisplayModes(_THIS, SDL_VideoDisplay * display);
extern int UIKit_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi, float * hdpi, float * vdpi);
extern int UIKit_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
extern void UIKit_QuitModes(_THIS);
extern int UIKit_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect);