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SDL 3.0 video modes are sized in points, with a separate pixel density

This commit is contained in:
Sam Lantinga 2023-07-06 15:19:17 -07:00
parent dda474504f
commit 95033e87e1
1 changed files with 15 additions and 13 deletions
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28
src/video/uikit/SDL_uikitmodes.m
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@ -135,15 +135,16 @@ static int UIKit_AddSingleDisplayMode(SDL_VideoDisplay *display, int w, int h,
UIScreen *uiscreen, UIScreenMode *uiscreenmode)
{
SDL_DisplayMode mode;
float scale = uiscreen.nativeScale;
SDL_zero(mode);
if (UIKit_AllocateDisplayModeData(&mode, uiscreenmode) < 0) {
return -1;
}
mode.w = w;
mode.h = h;
mode.pixel_density = uiscreen.nativeScale;
mode.w = w / scale;
mode.h = h / scale;
mode.pixel_density = scale;
mode.refresh_rate = UIKit_GetDisplayModeRefreshRate(uiscreen);
mode.format = SDL_PIXELFORMAT_ABGR8888;
@ -172,24 +173,25 @@ static int UIKit_AddDisplayMode(SDL_VideoDisplay *display, int w, int h,
return 0;
}
static CGSize GetUIScreenModePixelSize(UIScreen *uiscreen, UIScreenMode *mode)
static CGSize GetUIScreenModeSize(UIScreen *uiscreen, UIScreenMode *mode)
{
/* For devices such as iPhone 6/7/8 Plus, the UIScreenMode reported by iOS
* isn't the physical pixels of the display, but rather the point size times
* the scale. For example, on iOS 12.2 on iPhone 8 Plus the physical pixel
* resolution is 1080x1920, the size reported by mode.size is 1242x2208,
* the size in points is 414x736, the scale property is 3.0, and the
* nativeScale property is ~2.6087 (ie 1920.0 / 736.0). So we need a bit of
* math to convert from retina pixels (point size multiplied by scale) to
* real pixels.
* nativeScale property is ~2.6087 (ie 1920.0 / 736.0).
*
* What we want for the mode size is the point size, and the pixel density
* is the native scale.
*
* Note that the iOS Simulator doesn't have this behavior for those devices.
* https://github.com/libsdl-org/SDL/issues/3220
*/
CGSize size = mode.size;
CGFloat scale = uiscreen.nativeScale / uiscreen.scale;
size.width = SDL_round(size.width * scale);
size.height = SDL_round(size.height * scale);
size.width = SDL_round(size.width / uiscreen.scale);
size.height = SDL_round(size.height / uiscreen.scale);
return size;
}
@ -197,7 +199,7 @@ static CGSize GetUIScreenModePixelSize(UIScreen *uiscreen, UIScreenMode *mode)
int UIKit_AddDisplay(UIScreen *uiscreen, SDL_bool send_event)
{
UIScreenMode *uiscreenmode = uiscreen.currentMode;
CGSize size = GetUIScreenModePixelSize(uiscreen, uiscreenmode);
CGSize size = GetUIScreenModeSize(uiscreen, uiscreenmode);
SDL_VideoDisplay display;
SDL_DisplayMode mode;
@ -316,7 +318,7 @@ int UIKit_GetDisplayModes(SDL_VideoDevice *_this, SDL_VideoDisplay *display)
#endif
for (UIScreenMode *uimode in availableModes) {
CGSize size = GetUIScreenModePixelSize(data.uiscreen, uimode);
CGSize size = GetUIScreenModeSize(data.uiscreen, uimode);
int w = size.width;
int h = size.height;