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/*
* Copyright (C) 2004 Stefan Kleine Stegemann
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#import "PopplerCachingRenderer.h"
#import "PopplerDocument+Rendering.h"
#import "MKLRUCache.h"
#include <math.h>
// default cache size
const unsigned long kDefaultCacheSize = 10485760;
// Helps to build hashcodes. The first number has to
// be an odd prime number.
#define FIRST_TERM(x) 37 * x
/**
* A key for putting render results in dictionaries.
*/
@interface CacheKey : NSObject
{
int pageNum;
NSRect srcBox;
float scale;
}
- (id) initWithPageNum: (unsigned)aPageNum
srcBox: (NSRect)aBox
scale: (float)aScale;
+ (id) keyWithPageNum: (unsigned)aPageNum
srcBox: (NSRect)aBox
scale: (float)aScale;
@end
/**
* Non-Public methods.
*/
@interface PopplerCachingRenderer (Private)
@end
@implementation PopplerCachingRenderer
- (id) initWithDocument: (PopplerDocument*)aDocument
{
return [self initWithRenderer: [aDocument bufferedRenderer]];
}
- (id) initWithRenderer: (id<PopplerBufferedRenderer>)aRenderer
{
NSAssert(aRenderer, @"nil renderer");
self = [super init];
if (self)
{
renderer = [(NSObject*)aRenderer retain];
cache = [[MKLRUCache alloc] initWithMaxSize: [PopplerCachingRenderer defaultCacheSize]];
}
return self;
}
- (void) dealloc
{
[(NSObject*)cache release];
[(NSObject*)renderer release];
[super dealloc];
}
+ (unsigned long) defaultCacheSize
{
return kDefaultCacheSize;
}
- (void) setCacheSize: (unsigned long)aSize
{
[cache setMaximumSize: aSize];
}
- (id) renderPage: (PopplerPage*)aPage
srcBox: (NSRect)aBox
scale: (float)aScale
{
CacheKey* key = [CacheKey keyWithPageNum: [aPage index]
srcBox: aBox
scale: aScale];
id cachedResult = [cache objectForKey: key];
if (!cachedResult)
{
cachedResult = [renderer renderPage: aPage
srcBox: aBox
scale: aScale];
NS_DURING
[cache putObject: cachedResult forKey: key];
NS_HANDLER
NSLog(@"failed to cache rendered page for key %@: %@",
[key description], [localException reason]);
NS_ENDHANDLER
}
return cachedResult;
}
- (id) renderPage: (PopplerPage*)aPage
scale: (float)aScale
{
return [self renderPage: aPage
srcBox: NSMakeRect(-1, -1, -1, -1)
scale: aScale];
}
@end
/* ----------------------------------------------------- */
/* Category Private */
/* ----------------------------------------------------- */
@implementation PopplerCachingRenderer (Private)
@end
/* ----------------------------------------------------- */
/* Class CacheKey */
/* ----------------------------------------------------- */
@implementation CacheKey
- (id) initWithPageNum: (unsigned)aPageNum
srcBox: (NSRect)aBox
scale: (float)aScale
{
self = [super init];
if (self)
{
srcBox = aBox;
scale = aScale;
pageNum = aPageNum;
}
return self;
}
+ (id) keyWithPageNum: (unsigned)aPageNum
srcBox: (NSRect)aBox
scale: (float)aScale
{
return [[[CacheKey alloc] initWithPageNum: aPageNum
srcBox: aBox
scale: aScale] autorelease];
}
- (unsigned) hash
{
unsigned result = 23; // SEED
result = FIRST_TERM(result) + pageNum;
// convert the scale factor to int, using 4 decimal
// precision. This should be sufficient since 0.75411
// and 0.75412 doesn't really make a difference to the
// human sitting in front of the screen
result = FIRST_TERM(result) + (int)(scale * 10000);
// we also use a 4 decimal precision for the rectangle
result = FIRST_TERM(result) + (int)(NSMinX(srcBox) * 10000);
result = FIRST_TERM(result) + (int)(NSMinY(srcBox) * 10000);
result = FIRST_TERM(result) + (int)(NSWidth(srcBox) * 10000);
result = FIRST_TERM(result) + (int)(NSHeight(srcBox) * 10000);
return result;
}
- (BOOL) isEqual: (id)anObject
{
if ((!anObject) || (![anObject isKindOfClass: [CacheKey class]]))
{
return NO;
}
return ([self hash] == [anObject hash]);
}
- (id) copyWithZone: (NSZone*)zone
{
return [self retain];
}
- (NSString*) description
{
return [NSString stringWithFormat:
@"{page=%d, scale=%f, srcBox=(%f, %f, %f, %f)}",
pageNum, scale, NSMinX(srcBox), NSMinY(srcBox),
NSWidth(srcBox), NSHeight(srcBox)];
}
@end
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