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Fixed bug 4883 - Add approximation for display DPI on iOS 

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.
Sam Lantinga 2019-12-08 11:36:40 -08:00
parent 54748a39be
commit 140918bb6f
2 changed files with 167 additions and 3 deletions
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4
src/video/uikit/SDL_uikitmodes.h
View File

@ -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);

166
src/video/uikit/SDL_uikitmodes.m
View File

@ -27,9 +27,150 @@
#include "../../events/SDL_events_c.h"
#import <sys/utsname.h>
@implementation SDL_DisplayData
- (instancetype)initWithScreen:(UIScreen*)screen
{
if (self = [super init]) {
self.uiscreen = screen;
/*
* A well up to date list of device info can be found here:
* https://github.com/lmirosevic/GBDeviceInfo/blob/master/GBDeviceInfo/GBDeviceInfo_iOS.m
*/
NSDictionary* devices = @{
@"iPhone1,1": @163,
@"iPhone1,2": @163,
@"iPhone2,1": @163,
@"iPhone3,1": @326,
@"iPhone3,2": @326,
@"iPhone3,3": @326,
@"iPhone4,1": @326,
@"iPhone5,1": @326,
@"iPhone5,2": @326,
@"iPhone5,3": @326,
@"iPhone5,4": @326,
@"iPhone6,1": @326,
@"iPhone6,2": @326,
@"iPhone7,1": @401,
@"iPhone7,2": @326,
@"iPhone8,1": @326,
@"iPhone8,2": @401,
@"iPhone8,4": @326,
@"iPhone9,1": @326,
@"iPhone9,2": @401,
@"iPhone9,3": @326,
@"iPhone9,4": @401,
@"iPhone10,1": @326,
@"iPhone10,2": @401,
@"iPhone10,3": @458,
@"iPhone10,4": @326,
@"iPhone10,5": @401,
@"iPhone10,6": @458,
@"iPhone11,2": @458,
@"iPhone11,4": @458,
@"iPhone11,6": @458,
@"iPhone11,8": @326,
@"iPhone12,1": @326,
@"iPhone12,3": @458,
@"iPhone12,5": @458,
@"iPad1,1": @132,
@"iPad2,1": @132,
@"iPad2,2": @132,
@"iPad2,3": @132,
@"iPad2,4": @132,
@"iPad2,5": @163,
@"iPad2,6": @163,
@"iPad2,7": @163,
@"iPad3,1": @264,
@"iPad3,2": @264,
@"iPad3,3": @264,
@"iPad3,4": @264,
@"iPad3,5": @264,
@"iPad3,6": @264,
@"iPad4,1": @264,
@"iPad4,2": @264,
@"iPad4,3": @264,
@"iPad4,4": @326,
@"iPad4,5": @326,
@"iPad4,6": @326,
@"iPad4,7": @326,
@"iPad4,8": @326,
@"iPad4,9": @326,
@"iPad5,1": @326,
@"iPad5,2": @326,
@"iPad5,3": @264,
@"iPad5,4": @264,
@"iPad6,3": @264,
@"iPad6,4": @264,
@"iPad6,7": @264,
@"iPad6,8": @264,
@"iPad6,11": @264,
@"iPad6,12": @264,
@"iPad7,1": @264,
@"iPad7,2": @264,
@"iPad7,3": @264,
@"iPad7,4": @264,
@"iPad7,5": @264,
@"iPad7,6": @264,
@"iPad7,11": @264,
@"iPad7,12": @264,
@"iPad8,1": @264,
@"iPad8,2": @264,
@"iPad8,3": @264,
@"iPad8,4": @264,
@"iPad8,5": @264,
@"iPad8,6": @264,
@"iPad8,7": @264,
@"iPad8,8": @264,
@"iPad11,1": @326,
@"iPad11,2": @326,
@"iPad11,3": @326,
@"iPad11,4": @326,
@"iPod1,1": @163,
@"iPod2,1": @163,
@"iPod3,1": @163,
@"iPod4,1": @326,
@"iPod5,1": @326,
@"iPod7,1": @326,
@"iPod9,1": @326,
};
struct utsname systemInfo;
uname(&systemInfo);
NSString* deviceName =
[NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
id foundDPI = devices[deviceName];
if (foundDPI) {
self.screenDPI = (float)[foundDPI integerValue];
} else {
/*
* Estimate the DPI based on the screen scale multiplied by the base DPI for the device
* type (e.g. based on iPhone 1 and iPad 1)
*/
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 80000
float scale = (float)screen.nativeScale;
#else
float scale = (float)screen.scale;
#endif
float defaultDPI;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
defaultDPI = 132.0f;
} else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
defaultDPI = 163.0f;
} else {
defaultDPI = 160.0f;
}
self.screenDPI = scale * defaultDPI;
}
}
return self;
}
@synthesize uiscreen;
@synthesize screenDPI;
@end
@ -153,14 +294,12 @@ UIKit_AddDisplay(UIScreen *uiscreen)
display.current_mode = mode;
/* Allocate the display data */
SDL_DisplayData *data = [[SDL_DisplayData alloc] init];
SDL_DisplayData *data = [[SDL_DisplayData alloc] initWithScreen:uiscreen];
if (!data) {
UIKit_FreeDisplayModeData(&display.desktop_mode);
return SDL_OutOfMemory();
}
data.uiscreen = uiscreen;
display.driverdata = (void *) CFBridgingRetain(data);
SDL_AddVideoDisplay(&display);
@ -243,6 +382,27 @@ UIKit_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
}
}
int
UIKit_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi, float * hdpi, float * vdpi)
{
@autoreleasepool {
SDL_DisplayData *data = (__bridge SDL_DisplayData *) display->driverdata;
float dpi = data.screenDPI;
if (ddpi) {
*ddpi = dpi * (float)SDL_sqrt(2.0);
}
if (hdpi) {
*hdpi = dpi;
}
if (vdpi) {
*vdpi = dpi;
}
}
return 0;
}
int
UIKit_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode)
{