Hello,
I'm exporting an animted GIF and want to set properties like the loop
count or if a global colormap is used. It seems that I have a problem
with CGImageDestinationSetProperties. Setting the frame related
properties like the delay time for the frames works fine, but the
image related properties like loop count or global colormap seem not
to be written to the file. (see my code below)
Anybody an idea?
Cheers,
Patrick
NSMutableDictionary *gifFrameProperties = [[NSMutableDictionary
dictionaryWithCapacity:1] retain]; //fp0
NSMutableDictionary *gifImageProperties = [[NSMutableDictionary
dictionaryWithCapacity:6] retain]; //ip0 to ip5
//image resolution
[gifImageProperties setObject:[NSNumber
numberWithFloat:resolution] forKey:(NSString *)
kCGImagePropertyDPIWidth]; //ip0
[gifImageProperties setObject:[NSNumber
numberWithFloat:resolution] forKey:(NSString *)
kCGImagePropertyDPIHeight]; //ip1
//color model
[gifImageProperties setObject:(NSString *)
kCGImagePropertyColorModelRGB forKey:(NSString *)
kCGImagePropertyColorModel]; //ip2
//use global colormap
[gifImageProperties setObject:[NSNumber
numberWithBool:globalColormap] forKey:(NSString *)
kCGImagePropertyGIFHasGlobalColorMap]; //ip3
if(loop){ //fp4
[gifImageProperties setObject:[NSNumber
numberWithFloat:loopCount] forKey:(NSString *)
kCGImagePropertyGIFLoopCount]; //loop animation, 0 = indefinitly
}
NSDictionary *finalGIFImageProperties = [NSDictionary
dictionaryWithObject:gifImageProperties forKey:(NSString *)
kCGImagePropertyGIFDictionary];
//delay between frames
[gifFrameProperties setObject:[NSNumber numberWithFloat:spf]
forKey:(NSString *)kCGImagePropertyGIFDelayTime]; //fp0
NSDictionary *finalGIFFrameProperties = [NSDictionary
dictionaryWithObject:gifFrameProperties forKey:(NSString *)
kCGImagePropertyGIFDictionary];
//we have to know the image count before we add the images in the
loop
imageCount = totalDuration / spf;
imageDestination = CGImageDestinationCreateWithURL((CFURLRef)
filePathURL, kUTTypeGIF, imageCount, NULL);
int imagesWritten = 0;
//t loop runs can be 1 image off due to int cast in imageCount
calculation -> doublecheck condition
for(t = 0.0; imagesWritten < imageCount && t <= totalDuration; t
+= spf){
imageRef = [self createImageForTimeStamp:t];
CGImageDestinationAddImage(imageDestination, imageRef,
(CFDictionaryRef)finalGIFFrameProperties); //setting frame related
properties workes fine here
imagesWritten++;
}
//seems this does not work...
CGImageDestinationSetProperties(imageDestination,
(CFDictionaryRef)finalGIFImageProperties);
CGImageDestinationFinalize(imageDestination) //writing the image
works fine too - only the properties are missing...
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to [EMAIL PROTECTED]
