Re: WebConvertNSImageToCGImageRef Issues
Re: WebConvertNSImageToCGImageRef Issues
- Subject: Re: WebConvertNSImageToCGImageRef Issues
- From: John Pannell <email@hidden>
- Date: Sun, 15 Jan 2006 22:51:17 -0700
Hi Chad-
Not sure if you were more interested in getting the WebConvert
function to work (which I know nothing about) or if you wanted a good
method to make a CGImageRef (which I can help with). Here's a C
function I use to load CGImageRefs from a PNG image file in my bundle...
CGImageRef loadImageNamed(NSString *name)
{
CFURLRef thisURL = CFURLCreateWithFileSystemPath(NULL,
(CFStringRef)[[NSBundle mainBundle] pathForImageResource:name],
kCFURLPOSIXPathStyle, false);
if(thisURL == NULL){
NSLog(@"couldn't create URL!");
return nil;
}
CGDataProviderRef thisDataProvider = CGDataProviderCreateWithURL
(thisURL);
CFRelease(thisURL);
if(thisDataProvider == NULL){
NSLog(@"couldn't create data provider");
return nil;
}
CGImageRef thisImageRef = CGImageCreateWithPNGDataProvider
(thisDataProvider, NULL, true, kCGRenderingIntentDefault);
CGDataProviderRelease(thisDataProvider);
if(thisImageRef == NULL){
NSLog(@"couldn't create imageRef");
return nil;
}
return thisImageRef;
}
to call it...
CGImageRef myQuartzImage = loadImageNamed(@"myImage");
In your code, there might be an issue (although I would think XCode
would have warned you) with the "unLockFocus" method - I believe it
is "unlockFocus" without the capital L.
HTH!
John
On Jan 15, 2006, at 10:37 PM, Chad Weider wrote:
I seem to be getting odd results when using WebKit's
WebConvertNSImageToCGImageRef to convert NSImages to their CGImage
counterparts...
This code works fine:
NSImage *theImage = [NSImage imageNamed:@"NSApplicationIcon"];
CGImageRef theRef = WebConvertNSImageToCGImageRef(theImage);
[theImage lockFocus];
//Some Drawing
[theImage unLockFocus];
if(theImage != nil && theRef == nil)
NSLog(@"wtf");
...just that drawing code won't take effect
And this will log wtf everytime:
NSImage *theImage = [NSImage imageNamed:@"testImage.png"];
CGImageRef theRef = WebConvertNSImageToCGImageRef(theImage);
[theImage lockFocus];
//Some Drawing
[theImage unLockFocus];
if(theImage != nil && theRef == nil)
NSLog(@"wtf");
...but if the lockFocus stuff is removed, it passes.
Any ideas?
...apple's documentation on the function is pretty nonexistent...so
I would think there shouldn't be any suprises in-store for me, eh?
Chad Weider
email@hidden
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