如何在OS X上以编程方式确定Retina MacBook Pro屏幕的原始像素分辨率? [英] How to programmatically determine native pixel resolution of Retina MacBook Pro screen on OS X?

问题描述

给出

CGError error = CGGetActiveDisplayList(8, directDisplayIDs, &displayCount);

对于Retina MacBook Pro的内置屏幕，我希望使用来获取原始像素尺寸

for the built-in screen on a Retina MacBook Pro, I would expect to fetch the native pixel dimensions using

size_t pixelWidth = CGDisplayPixelsWide(directDisplayID);
size_t pixelHeight = CGDisplayPixelsHigh(directDisplayID);

但是，这些调用仅返回当前选定模式的尺寸.如果更改屏幕分辨率，则会返回不同的值.我当时希望在15英寸的rMBP上恢复2880 x 1800.

However, these calls only return the dimensions of the currently selected mode. If I change screen resolution I get back different values. I was looking to get back 2880 x 1800 on a 15" rMBP.

如何获取Retina MacBook Pro屏幕的原始像素尺寸?

How do I fetch the native pixel dimensions of a Retina MacBook Pro screen?

推荐答案

CGDisplayModeGetIOFlags可以告诉您一些显示信息.原始分辨率设置为kDisplayModeNativeFlag.以下将ns设置为窗口win当前屏幕的原始分辨率.

CGDisplayModeGetIOFlags can tell you some information of the display. The native resolutions have kDisplayModeNativeFlag set. The following will set ns to be the native resolution of the current screen of the window win.

CGDirectDisplayID sid = ((NSNumber *)[win.screen.deviceDescription
    objectForKey:@"NSScreenNumber"]).unsignedIntegerValue;
CFArrayRef ms = CGDisplayCopyAllDisplayModes(sid, NULL);
CFIndex n = CFArrayGetCount(ms);
NSSize ns;
for(int i = 0; i < n; ++i){
    CGDisplayModeRef m = (CGDisplayModeRef)CFArrayGetValueAtIndex(ms, i);
    if(CGDisplayModeGetIOFlags(m) & kDisplayModeNativeFlag){
        ns.width = CGDisplayModeGetPixelWidth(m);
        ns.height = CGDisplayModeGetPixelHeight(m);
        break;
    }
}
CFRelease(ms);

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