mirror of https://github.com/libsdl-org/SDL
SDL 3.0 video modes are sized in points, with a separate pixel density
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@ -135,15 +135,16 @@ static int UIKit_AddSingleDisplayMode(SDL_VideoDisplay *display, int w, int h,
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UIScreen *uiscreen, UIScreenMode *uiscreenmode)
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{
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SDL_DisplayMode mode;
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float scale = uiscreen.nativeScale;
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SDL_zero(mode);
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if (UIKit_AllocateDisplayModeData(&mode, uiscreenmode) < 0) {
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return -1;
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}
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mode.w = w;
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mode.h = h;
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mode.pixel_density = uiscreen.nativeScale;
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mode.w = w / scale;
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mode.h = h / scale;
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mode.pixel_density = scale;
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mode.refresh_rate = UIKit_GetDisplayModeRefreshRate(uiscreen);
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mode.format = SDL_PIXELFORMAT_ABGR8888;
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@ -172,24 +173,25 @@ static int UIKit_AddDisplayMode(SDL_VideoDisplay *display, int w, int h,
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return 0;
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}
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static CGSize GetUIScreenModePixelSize(UIScreen *uiscreen, UIScreenMode *mode)
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static CGSize GetUIScreenModeSize(UIScreen *uiscreen, UIScreenMode *mode)
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{
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/* For devices such as iPhone 6/7/8 Plus, the UIScreenMode reported by iOS
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* isn't the physical pixels of the display, but rather the point size times
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* the scale. For example, on iOS 12.2 on iPhone 8 Plus the physical pixel
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* resolution is 1080x1920, the size reported by mode.size is 1242x2208,
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* the size in points is 414x736, the scale property is 3.0, and the
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* nativeScale property is ~2.6087 (ie 1920.0 / 736.0). So we need a bit of
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* math to convert from retina pixels (point size multiplied by scale) to
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* real pixels.
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* nativeScale property is ~2.6087 (ie 1920.0 / 736.0).
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*
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* What we want for the mode size is the point size, and the pixel density
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* is the native scale.
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*
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* Note that the iOS Simulator doesn't have this behavior for those devices.
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* https://github.com/libsdl-org/SDL/issues/3220
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*/
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CGSize size = mode.size;
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CGFloat scale = uiscreen.nativeScale / uiscreen.scale;
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size.width = SDL_round(size.width * scale);
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size.height = SDL_round(size.height * scale);
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size.width = SDL_round(size.width / uiscreen.scale);
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size.height = SDL_round(size.height / uiscreen.scale);
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return size;
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}
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@ -197,7 +199,7 @@ static CGSize GetUIScreenModePixelSize(UIScreen *uiscreen, UIScreenMode *mode)
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int UIKit_AddDisplay(UIScreen *uiscreen, SDL_bool send_event)
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{
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UIScreenMode *uiscreenmode = uiscreen.currentMode;
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CGSize size = GetUIScreenModePixelSize(uiscreen, uiscreenmode);
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CGSize size = GetUIScreenModeSize(uiscreen, uiscreenmode);
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SDL_VideoDisplay display;
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SDL_DisplayMode mode;
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@ -316,7 +318,7 @@ int UIKit_GetDisplayModes(SDL_VideoDevice *_this, SDL_VideoDisplay *display)
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#endif
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for (UIScreenMode *uimode in availableModes) {
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CGSize size = GetUIScreenModePixelSize(data.uiscreen, uimode);
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CGSize size = GetUIScreenModeSize(data.uiscreen, uimode);
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int w = size.width;
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int h = size.height;
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