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Fix crash when switching between monitors in wxOSX

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It is possible for CGDisplayModeCopyPixelEncoding to return NULL, e.g.
during a switch between the built-in screen and an external monitor on a
Macbook. Check the return value to prevent a crash.

Closes #18015.
This commit is contained in:
Tim Kosse 2017-12-04 13:15:44 +01:00 committed by Vadim Zeitlin
parent be37dd4862
commit 26f48c225e
1 changed files with 13 additions and 12 deletions
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9
src/osx/utils_osx.cpp
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@ -66,21 +66,22 @@ bool wxColourDisplay()
// Returns depth of screen // Returns depth of screen
int wxDisplayDepth() int wxDisplayDepth()
{ {
int theDepth = 0;
CGDisplayModeRef currentMode = CGDisplayCopyDisplayMode(kCGDirectMainDisplay); CGDisplayModeRef currentMode = CGDisplayCopyDisplayMode(kCGDirectMainDisplay);
CFStringRef encoding = CGDisplayModeCopyPixelEncoding(currentMode); CFStringRef encoding = CGDisplayModeCopyPixelEncoding(currentMode);
int theDepth = 32; // some reasonable default
if(encoding)
{
if(CFStringCompare(encoding, CFSTR(IO32BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo) if(CFStringCompare(encoding, CFSTR(IO32BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo)
theDepth = 32; theDepth = 32;
else if(CFStringCompare(encoding, CFSTR(IO16BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo) else if(CFStringCompare(encoding, CFSTR(IO16BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo)
theDepth = 16; theDepth = 16;
else if(CFStringCompare(encoding, CFSTR(IO8BitIndexedPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo) else if(CFStringCompare(encoding, CFSTR(IO8BitIndexedPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo)
theDepth = 8; theDepth = 8;
else
theDepth = 32; // some reasonable default
CFRelease(encoding); CFRelease(encoding);
}
CGDisplayModeRelease(currentMode); CGDisplayModeRelease(currentMode);
return theDepth; return theDepth;