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//
// ReaderThumbFetch.m
// Reader v2.6.1
//
// Created by Julius Oklamcak on 2011-09-01.
// Copyright © 2011-2013 Julius Oklamcak. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to
// do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#import "ReaderThumbFetch.h"
#import "ReaderThumbRender.h"
#import "ReaderThumbCache.h"
#import "ReaderThumbView.h"
#import <ImageIO/ImageIO.h>
@implementation ReaderThumbFetch
{
ReaderThumbRequest *request;
}
#pragma mark ReaderThumbFetch instance methods
- (id)initWithRequest:(ReaderThumbRequest *)options
{
if ((self = [super initWithGUID:options.guid]))
{
request = options;
}
return self;
}
- (void)cancel
{
[super cancel]; // Cancel the operation
request.thumbView.operation = nil; // Break retain loop
request.thumbView = nil; // Release target thumb view on cancel
[[ReaderThumbCache sharedInstance] removeNullForKey:request.cacheKey];
}
- (NSURL *)thumbFileURL
{
NSString *cachePath = [ReaderThumbCache thumbCachePathForGUID:request.guid]; // Thumb cache path
NSString *fileName = [NSString stringWithFormat:@"%@.png", request.thumbName]; // Thumb file name
return [NSURL fileURLWithPath:[cachePath stringByAppendingPathComponent:fileName]]; // File URL
}
- (void)main
{
CGImageRef imageRef = NULL; NSURL *thumbURL = [self thumbFileURL];
CGImageSourceRef loadRef = CGImageSourceCreateWithURL((__bridge CFURLRef)thumbURL, NULL);
if (loadRef != NULL) // Load the existing thumb image
{
imageRef = CGImageSourceCreateImageAtIndex(loadRef, 0, NULL); // Load it
CFRelease(loadRef); // Release CGImageSource reference
}
else // Existing thumb image not found - so create and queue up a thumb render operation on the work queue
{
ReaderThumbRender *thumbRender = [[ReaderThumbRender alloc] initWithRequest:request]; // Create a thumb render operation
[thumbRender setQueuePriority:self.queuePriority]; [thumbRender setThreadPriority:(self.threadPriority - 0.1)]; // Priority
if (self.isCancelled == NO) // We're not cancelled - so update things and add the render operation to the work queue
{
request.thumbView.operation = thumbRender; // Update the thumb view operation property to the new operation
[[ReaderThumbQueue sharedInstance] addWorkOperation:thumbRender]; return; // Queue the operation
}
}
if (imageRef != NULL) // Create a UIImage from a CGImage and show it
{
UIImage *image = [UIImage imageWithCGImage:imageRef scale:request.scale orientation:UIImageOrientationUp];
CGImageRelease(imageRef); // Release the CGImage reference from the above thumb load code
UIGraphicsBeginImageContextWithOptions(image.size, YES, request.scale); // Graphics context
[image drawAtPoint:CGPointZero]; // Decode and draw the image on this background thread
UIImage *decoded = UIGraphicsGetImageFromCurrentImageContext(); // Newly decoded image
UIGraphicsEndImageContext(); // Cleanup after the bitmap-based graphics drawing context
[[ReaderThumbCache sharedInstance] setObject:decoded forKey:request.cacheKey]; // Cache it
if (self.isCancelled == NO) // Show the image in the target thumb view on the main thread
{
ReaderThumbView *thumbView = request.thumbView; // Target thumb view for image show
NSUInteger targetTag = request.targetTag; // Target reference tag for image show
dispatch_async(dispatch_get_main_queue(), // Queue image show on main thread
^{
if (thumbView.targetTag == targetTag) [thumbView showImage:decoded];
});
}
}
request.thumbView.operation = nil; // Break retain loop
}
@end