hb_get_preview -> CGImage / NSImage how?

[nikwest]

Hi all,

I am struggling to create a CGImage (or an NSImage) out of the hb_get_preview data.

Could anybody enlighten me what kind of format the returned buffer have? I am really stuck

Regards

NikWest

[prigaux]

Yep, it's a 32bits RGB so the value are only the RGB colors not coded at all.

You can have look at the code of hb.c in libhb folder to see it generation.

Philippe

[nikwest]

Ok, thanks.

I solved it. In case somebody is wondering how, here is the code snippet:

Code: Select all

	CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
	CGContextRef cntxt = CGBitmapContextCreate(
											   [imageBuffer mutableBytes],
											   title->width+2,
											   title->height+2,
											   8,
											   (title->width+2)*4,
											   cs,
											   kCGImageAlphaNoneSkipFirst|kCGBitmapByteOrder32Little
											   );

	hb_get_preview( handle, title, fPicture,  [imageBuffer mutableBytes]);
	
	CGImageRef image = CGBitmapContextCreateImage(cntxt);
	CGContextRelease(cntxt);
	CGColorSpaceRelease(cs);

Problem was mostly because the buffer has a BGRA layout.

NikWest