Re: Is the version of MacOS available to CPP ?

[Ben Abbott]

On Jun 10, 2012, at 12:49 PM, Ben Abbott wrote:

> On Jun 9, 2012, at 11:18 AM, Ben Abbott wrote:
> 
>> With MacOS 10.7.x, Apple has deprecated CGDisplayBitsPerPixel. Adding the 
>> code below to display.cc will allow the sources to be built with 
>> "--with-framework-carbon", but isn't the right solution for earlier versions 
>> of MacOS X.
>> 
>> #if defined (HAVE_FRAMEWORK_CARBON)
>> size_t CGDisplayBitsPerPixel (CGDirectDisplayID display)
>> {
>> CGDisplayModeRef mode = CGDisplayCopyDisplayMode (display);
>> CFStringRef pixelEncoding = CGDisplayModeCopyPixelEncoding (mode);
>> 
>> if (CFStringCompare (pixelEncoding, CFSTR (IO32BitDirectPixels), 0) == 0)
>>   return 32;
>> else if (CFStringCompare (pixelEncoding, CFSTR (IO16BitDirectPixels), 0) == 
>> 0)
>>   return 16;
>> else 
>>   return 8;
>> }
>> #endif
>> 
>> Is the version of MacOS X available to the preprocessor ?
>> 
>> Ben
> 
> The link below has a solution that does not require preprocessing.
> 
>       
> http://stackoverflow.com/questions/8210824/how-to-avoid-cgdisplaymodecopypixelencoding-to-get-bpp
> 
> ... but looks to be written in objective-c (?), which I have no experience 
> with.
> 
> Unless I've overlooked something, the only part I'm having trouble with is 
> below.
> 
>  CFNumberGetValue((CFNumberRef)CFDictionaryGetValue(currentDisplayMode, 
> kCGDisplayBitsPerPixel), kCFNumberIntType, &screenBPP);
> 
> I'm hoping someone can provide a quick translation to c++.
> 
> TiA,
> Ben

I think I managed to understand how the code at the link above works, and 
produced a c++ version.

Alexander,

The attached changeset works for me on MacOS 10.7 using both the default and 
stable branches.

Can you (someone else?) try the attached changeset on MacOS 10.5 ?

Ben

changeset.patch
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