Hi,
CGDataProviderRef provider = CGDataProviderCreateDirect( &mps, sizeof(mps),
&callbacks );
NSWindow* window = (NSWindow*)Window();
What does this line do?
It's just a global function which returns the (only) window.
For crossplatform compatibility reasons (our app runs on MacOSX, Linux, Windows
and Android) it returns a void*,
that's why the cast is needed.
This one :
>> CGImageRef image = CGImageCreate( size_t(mDirtyRect.W()),
size_t(mDirtyRect.H()), 8, 32, size_t(mBlock->Width()*4),
>> [[window colorSpace] CGColorSpace],
kCGBitmapByteOrder32Big | kCGImageAlphaNoneSkipFirst,
>> provider, NULL, false,
kCGRenderingIntentRelativeColorimetric );
>>
It creates a CGImage which will use the CGDataProvider for a source of the
pixels.
The size is the same as the 'dirty' rect to refresh, 8 bits/component, 32
bits/pixel, w*4 bytes/row,
the windows colorspace, the pixel 'description' (integer, no useful data in
alpha channel),
my data provider, NULL(decode array), no interpolation (it's anyway a 1to1
mapping of the pixels), rendering intent.
The data provider just copies the pixels or returns a pointer to the correct
byte :
struct MyProviderStruct
{
::nImage8::cRGBABlock* mBlock;
int mX, mY;
};
static const void*
MyProviderGetBytePointer( void* iInfo )
{
MyProviderStruct* mps = (MyProviderStruct*) iInfo;
return mps->mBlock->Pixels( mps->mX, mps->mY ); // this returns a pointer
to that pixel
}
static void MyProviderReleaseBytePointer( void* iInfo, const void* iPointer ) {}
static size_t
MyProviderGetBytesAtPosition( void* iInfo, void* oBuffer, off_t iPosition,
size_t iCount )
{
MyProviderStruct* mps = (MyProviderStruct*) iInfo;
::nMemoryUtils::Copy( oBuffer, (uint8*)(mps->mBlock->Pixels()) + iPosition,
uint32(iCount) );
return iCount;
}
static void MyProviderReleaseInfo( void* iInfo ) {}
Except for the leaked memory, it works as expected.
Thanks
--
Keep intel OUTSIDE my Mac !
Hiii !!! I can see Intel chips creeping around my G5 !
Eric M.
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