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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/GraphicsImaging/index.html">Graphics & Imaging</a> > <a href="../../samplecode/GraphicsImaging/idxQuartz-date.html">Quartz</a> > <A HREF="javascript:location.replace('index.html');">MassiveImage</A> >
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<pre class="sourcecodebox">/*
File: Controller.m
Abstract: Handles all UI interaction and code for saving the image.
Version: 1.0
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
Inc. ("Apple") in consideration of your agreement to the
following terms, and your use, installation, modification or
redistribution of this Apple software constitutes acceptance of these
terms. If you do not agree with these terms, please do not use,
install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a personal, non-exclusive
license, under Apple's copyrights in this original Apple software (the
"Apple Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
provided that if you redistribute the Apple Software in its entirety and
without modifications, you must retain this notice and the following
text and disclaimers in all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or logos of Apple Computer,
Inc. may be used to endorse or promote products derived from the Apple
Software without specific prior written permission from Apple. Except
as expressly stated in this notice, no other rights or licenses, express
or implied, are granted by Apple herein, including but not limited to
any patent rights that may be infringed by your derivative works or by
other works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Copyright © 2007 Apple Inc., All Rights Reserved
*/
#import "Controller.h"
#import "DataProvider.h"
// Callback for our custom data provider in order to provide progress for UI.
void MyProgressCallback(void *context, float percentProgress)
{
[(Controller*)context progress:percentProgress];
}
// Callback for our custom data provider to determine if we should stop providing data in order to implement cancel
bool MyCancelCallback(void *context)
{
return [(Controller*)context userCanceled];
}
@implementation Controller
static NSString *kWidthKey = @"width";
static NSString *kHeightKey = @"height";
static NSString *kLocationKey = @"location";
-(void)saveTo:(NSDictionary*)info;
{
// Since we are being spun off into a thread, we need our own auto-release pool
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
// Signal that we are ready to start so that our progress sheet is displayed
[self performSelectorOnMainThread:@selector(startSaveUI) withObject:nil waitUntilDone:YES];
// Collect the size and save location for the image in question
size_t w = [[info objectForKey:kWidthKey] intValue];
size_t h = [[info objectForKey:kHeightKey] intValue];
NSURL *location = [info objectForKey:kLocationKey];
// Create a generic rgb color space
CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
// Setup our data provider
CGDataProviderRef provider = CreateDataProvider(w, h, self, MyProgressCallback, MyCancelCallback);
// Create the image with our data provider and color space - it will retain both so we will release them both after
CGImageRef image = CGImageCreate(
w, h, // width & height
kBitsPerComponent, kBitsPerPixel, // bits per component, bits per pixel
w * kBytesPerPixel, // bytes per row
colorSpace, // color space
kImageFlags, // format (XRGB) (see DataProvider.h)
provider, // data provider
NULL, // color decode array
true, // allow interpolation
kCGRenderingIntentDefault); // default rendering intent
CFRelease(colorSpace);
CFRelease(provider);
// Create a URL to our file destination and a CGImageDestination to save to.
CGImageDestinationRef imageDestination = CGImageDestinationCreateWithURL((CFURLRef)location, kUTTypeJPEG, 1, NULL);
// Add the image created above
CGImageDestinationAddImage(imageDestination, image, NULL);
// Finalize the image destination, which will write the image data to disk.
success = CGImageDestinationFinalize(imageDestination);
CFRelease(imageDestination);
CFRelease(image);
// Finally, signal that we are done so that the UI becomes active again.
[self performSelectorOnMainThread:@selector(endSaveUI) withObject:nil waitUntilDone:YES];
// Clean out our auto release pool.
[pool drain];
}
-(IBAction)save:(id)sender
{
// Clear the message just to avoid confusion.
[messageText setStringValue:@""];
// Verify the image width & height. Appkit's NSNumberFormatter
// will complain about out of range, but won't actually clip the range
// We just clip the range here and push it back out to the UI, not the most
// user friendly, but it keeps the data provider from exceeding the maximum
// limits of the data types that it uses (which is 4GB) and from underflowing.
int w = [width intValue], h = [height intValue];
if((w < 1) || (w > 32767) || (h < 1) || (h > 32767))
{
[messageText setStringValue:[NSString stringWithFormat:@"Cannot %i x %i image", w, h]];
}
else
{
// Configure and start a save panel to save the image
// If the panel is successful then saveImageDidEnd:returnCode:contextInfo
// will complete the transaction.
NSSavePanel * panel = [NSSavePanel savePanel];
[panel setCanSelectHiddenExtension:YES];
[panel setRequiredFileType:@"jpg"];
[panel setAllowsOtherFileTypes:NO];
[panel setTreatsFilePackagesAsDirectories:YES];
[panel
beginSheetForDirectory:nil
file:@"Test Image"
modalForWindow:[self window]
modalDelegate:self
didEndSelector:@selector(saveImageDidEnd:returnCode:contextInfo:)
contextInfo:nil];
}
}
-(void)saveImageDidEnd:(NSSavePanel*)panel returnCode:(int)returnCode contextInfo:(void*)contextInfo
{
// If the user elected to save, then do so.
if(returnCode == NSOKButton)
{
// Fill out the information needed to save
NSDictionary * info = [NSDictionary dictionaryWithObjectsAndKeys:[width objectValue], kWidthKey, [height objectValue], kHeightKey, [panel URL], kLocationKey, nil];
// And dispatch the operation to a background thread to avoid locking up the UI.
// detachNewThreadSelector:toTarget:withObject: will retain it's parameters so we don't have to.
// Equivalent to [self saveTo:info]
[NSThread detachNewThreadSelector:@selector(saveTo:) toTarget:self withObject:info];
}
}
-(IBAction)cancel:(id)sender
{
// Set the cancel flag - this will be picked up later in the Data Provider.
cancel = true;
}
-(bool)userCanceled
{
// Return the cancel flag's current state.
return cancel;
}
-(void)progress:(float)percent
{
// Only update the progress bar if the new value is significantly different
// from the old value. Here we define significant as 1%
if(percent > lastProgressUpdate + 1.0f)
{
// Remeber the new significant percentage...
lastProgressUpdate = percent;
// And call back to the main thread to update the progress bar
// (this is called within our provider on the background thread)
[self performSelectorOnMainThread:@selector(updateProgress) withObject:nil waitUntilDone:NO];
}
}
-(void)updateProgress
{
[progress setDoubleValue:lastProgressUpdate];
}
-(void)startSaveUI
{
// Reset UI variables for this run
lastProgressUpdate = 0.0;
cancel = false;
[progress setDoubleValue:0.0];
// Begin our progress sheet.
[NSApp beginSheet:sheetWindow modalForWindow:[self window] modalDelegate:nil didEndSelector:nil contextInfo:nil];
}
-(void)endSaveUI
{
// End the progress sheet.
[NSApp endSheet:sheetWindow];
// Send it on it's merry way.
[sheetWindow orderOut:self];
// Provide some feedback to the user about what just happened.
if(success)
{
[messageText setStringValue:@"Save succeeded."];
}
else if(cancel)
{
[messageText setStringValue:@"Save canceled by user."];
}
else
{
[messageText setStringValue:@"Save failed."];
}
}
@end
</pre>
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