darling-cocotron/AppKit/NSBitmapImageRep.m

/* Copyright (c) 2006-2007 Christopher J. W. Lloyd

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 <AppKit/NSBitmapImageRep-Private.h>
#import <AppKit/NSGraphicsContextFunctions.h>
#import <AppKit/NSView.h>
#import <AppKit/NSColor.h>
#import <AppKit/NSRaise.h>
#import <AppKit/NSPasteboard.h>

NSBitmapImageRepPropertyKey NSImageCompressionFactor = @"NSImageCompressionFactor";
NSBitmapImageRepPropertyKey NSImageCompressionMethod = @"NSImageCompressionMethod";
NSBitmapImageRepPropertyKey NSImageDitherTransparency = @"NSImageDitherTransparency";
NSBitmapImageRepPropertyKey NSImageInterlaced = @"NSImageInterlaced";
NSBitmapImageRepPropertyKey NSImageRGBColorTable = @"NSImageRGBColorTable";
NSBitmapImageRepPropertyKey NSImageFrameCount = @"NSImageFrameCount";
NSBitmapImageRepPropertyKey NSImageColorSyncProfileData = @"NSImageColorSyncProfileData";
NSBitmapImageRepPropertyKey NSImageFallbackBackgroundColor = @"NSImageFallbackBackgroundColor";
NSBitmapImageRepPropertyKey NSImageEXIFData = @"NSImageEXIFData";
NSBitmapImageRepPropertyKey NSImageProgressive = @"NSImageProgressive";
NSBitmapImageRepPropertyKey NSImageGamma = @"NSImageGamma";
NSBitmapImageRepPropertyKey NSImageLoopCount = @"NSImageLoopCount";
NSBitmapImageRepPropertyKey NSImageCurrentFrameDuration = @"NSImageCurrentFrameDuration";
NSBitmapImageRepPropertyKey NSImageCurrentFrame = @"NSImageCurrentFrame";

@implementation NSBitmapImageRep

+(NSArray *)imageUnfilteredFileTypes {
    return [NSArray arrayWithObjects:
            // Try to order them so the most used ones are at the top of the list
            @"png",
            @"tiff",
            @"tif",
            @"jpg",
            @"jpeg",
            @"icns",
            @"gif",
            @"bmp",
            @"PNG",
            @"TIFF",
            @"TIF",
            @"JPG",
            @"JPEG",
            @"ICNS",
            @"jpe",
            @"JPE",
            @"GIF",
            @"BMP",
            nil];
}

+(NSArray *)imageRepsWithContentsOfFile:(NSString *)path {
   NSData *data=[NSData dataWithContentsOfFile:path];
   
   if(data==nil)
    return nil;
    
   if([self canInitWithData:data])
    return [self imageRepsWithData:data];
   
   return nil;
}

+(void)getTIFFCompressionTypes:(const NSTIFFCompression **)types count:(int *)count {
   NSUnimplementedMethod();
}

+(NSString *)localizedNameForTIFFCompressionType:(NSTIFFCompression)type {
   NSUnimplementedMethod();
   return nil;
}

+(NSData *)TIFFRepresentationOfImageRepsInArray:(NSArray *)array {
   return [self TIFFRepresentationOfImageRepsInArray:array usingCompression:NSTIFFCompressionNone factor:0.0];
}

+(NSData *)TIFFRepresentationOfImageRepsInArray:(NSArray *)array usingCompression:(NSTIFFCompression)compression factor:(float)factor {
   NSMutableData        *result=[NSMutableData data];
   CGImageDestinationRef dest=CGImageDestinationCreateWithData((CFMutableDataRef)result,(CFStringRef)@"public.tiff",[array count],NULL);
   
   for(NSBitmapImageRep *bitmap in array){
    CGImageDestinationAddImage(dest,[bitmap CGImage],NULL);
   }

   CGImageDestinationFinalize(dest);
   CFRelease(dest);
   
   return result;
}

+(NSData *)representationOfImageRepsInArray:(NSArray *)array usingType:(NSBitmapImageFileType)type properties:(NSDictionary *)properties {
   NSUnimplementedMethod();
   return nil;
}

+(NSArray *)imageUnfilteredPasteboardTypes {
	return [NSArray arrayWithObjects:
			NSTIFFPboardType,
			nil];
}

+(BOOL)canInitWithData:(NSData *)data {
   CGImageSourceRef imageSource=CGImageSourceCreateWithData((CFDataRef)data,nil);
   BOOL result=(imageSource!=NULL)?YES:NO;
   CFRelease(imageSource);
   return result;
}

+(NSArray *)imageRepsWithData:(NSData *)data {
   NSMutableArray *result=[NSMutableArray array];
   CGImageSourceRef imageSource=CGImageSourceCreateWithData((CFDataRef)data,nil);
   
   if(imageSource==nil)
    return nil;
  
   size_t i,count=CGImageSourceGetCount(imageSource);
   
   for(i=0;i<count;i++){
    CGImageRef cgImage=CGImageSourceCreateImageAtIndex(imageSource,i,nil);
   
    if(cgImage==nil)
     break;
        
    CFDictionaryRef properties=CGImageSourceCopyPropertiesAtIndex(imageSource,i,nil);
    NSNumber        *xres=[[(id)CFDictionaryGetValue(properties,kCGImagePropertyDPIWidth) copy] autorelease];
    NSNumber        *yres=[[(id)CFDictionaryGetValue(properties,kCGImagePropertyDPIHeight) copy] autorelease];

    CFRelease(properties);

    NSBitmapImageRep *imageRep=[[self alloc] initWithCGImage:cgImage];
    NSSize size={ CGImageGetWidth(cgImage),CGImageGetHeight(cgImage) };
    
    CGImageRelease(cgImage);
   
    if(xres!=nil && [xres doubleValue]>0)
     size.width*=72.0/[xres doubleValue];
    
    if(yres!=nil && [yres doubleValue]>0)
     size.height*=72.0/[yres doubleValue];
     
    [imageRep setSize:size];
    
    if(imageRep!=nil)
     [result addObject:imageRep];
	   
	   [imageRep release];
}

   CFRelease(imageSource);

   return result;
}

+imageRepWithData:(NSData *)data {
   return [[[self alloc] initWithData:data] autorelease];
}

-initWithBitmapDataPlanes:(unsigned char **)planes pixelsWide:(int)width pixelsHigh:(int)height bitsPerSample:(int)bitsPerSample samplesPerPixel:(int)samplesPerPixel hasAlpha:(BOOL)hasAlpha isPlanar:(BOOL)isPlanar colorSpaceName:(NSString *)colorSpaceName bitmapFormat:(NSBitmapFormat)bitmapFormat bytesPerRow:(int)bytesPerRow bitsPerPixel:(int)bitsPerPixel {
   int i,numberOfPlanes=isPlanar?samplesPerPixel:1;
   
   _size=NSMakeSize(width,height);
   _colorSpaceName=[colorSpaceName copy];
   _bitsPerSample=bitsPerSample;
   _pixelsWide=width;
   _pixelsHigh=height;
   _hasAlpha=hasAlpha;

   _samplesPerPixel=samplesPerPixel;
   _isPlanar=isPlanar;
   _bitmapFormat=bitmapFormat;
   
   if(bitsPerPixel!=0)
    _bitsPerPixel=bitsPerPixel;
   else
    _bitsPerPixel=_bitsPerSample*_samplesPerPixel;

   if(bytesPerRow!=0)
    _bytesPerRow=bytesPerRow;
   else
    _bytesPerRow=(_bitsPerPixel*_pixelsWide+7)/8;

   _freeWhenDone=NO;
   if(planes==NULL)
    _freeWhenDone=YES;
   else {
    int i;
    
    for(i=0;i<numberOfPlanes;i++)
     if(planes[i]!=NULL)
      break;
      
    if(i==numberOfPlanes)
     _freeWhenDone=YES;
   }
   
   _bitmapPlanes=NSZoneCalloc(NULL,numberOfPlanes,sizeof(unsigned char *));
   for(i=0;i<numberOfPlanes;i++){
    if(!_freeWhenDone)
     _bitmapPlanes[i]=planes[i];
    else
     _bitmapPlanes[i]=NSZoneCalloc(NULL,_bytesPerRow*_pixelsHigh,1);
   }

   return self;
}

-initWithBitmapDataPlanes:(unsigned char **)planes pixelsWide:(int)width pixelsHigh:(int)height bitsPerSample:(int)bitsPerSample samplesPerPixel:(int)samplesPerPixel hasAlpha:(BOOL)hasAlpha isPlanar:(BOOL)isPlanar colorSpaceName:(NSString *)colorSpaceName bytesPerRow:(int)bytesPerRow bitsPerPixel:(int)bitsPerPixel {
   return [self initWithBitmapDataPlanes:planes pixelsWide:width pixelsHigh:height bitsPerSample:bitsPerSample samplesPerPixel:samplesPerPixel hasAlpha:hasAlpha isPlanar:isPlanar colorSpaceName:colorSpaceName bitmapFormat:0 bytesPerRow:bytesPerRow bitsPerPixel:bitsPerPixel];
}

-initForIncrementalLoad {
   NSUnimplementedMethod();
   return nil;
}

-initWithFocusedViewRect:(NSRect)rect {
   CGContextRef graphicsPort=NSCurrentGraphicsPort();
   
   if(graphicsPort==NULL){
    [self dealloc];
    return nil;
   }

   [self initWithData:(NSData *)CGContextCaptureBitmap(graphicsPort,rect)];
   
   return self;
}


-initWithData:(NSData *)data {
   CGImageSourceRef imageSource=CGImageSourceCreateWithData((CFDataRef)data,nil);
   
   if(imageSource==nil){
    [self dealloc];
    return nil;
   }
    
   CGImageRef       cgImage=CGImageSourceCreateImageAtIndex(imageSource,0,nil);
   
   if(cgImage==nil){
    CFRelease(imageSource);
    [self dealloc];
    return nil;
   }
   
   CFDictionaryRef properties=CGImageSourceCopyPropertiesAtIndex(imageSource,0,nil);
   NSNumber        *xres=[[(id)CFDictionaryGetValue(properties,kCGImagePropertyDPIWidth) copy] autorelease];
   NSNumber        *yres=[[(id)CFDictionaryGetValue(properties,kCGImagePropertyDPIHeight) copy] autorelease];

   CFRelease(properties);
   CFRelease(imageSource);

   if(cgImage==nil){
    [self dealloc];
    return nil;
   }

   if((self=[self initWithCGImage:cgImage])==nil)
    return nil;   

   CGImageRelease(cgImage);
   
   if(xres!=nil && [xres doubleValue]>0)
    _size.width*=72.0/[xres doubleValue];
    
   if(yres!=nil && [yres doubleValue]>0)
    _size.height*=72.0/[yres doubleValue];

   return self;
}
   
-initWithContentsOfFile:(NSString *)path {
   NSData *data=[NSData dataWithContentsOfFile:path];

   if(data==nil){
    [self dealloc];
    return nil;
   }
   
   return [self initWithData:data];
}

-(void)createBitmapIfNeeded {
   if(_bitmapPlanes==NULL){
    _freeWhenDone=YES;
    _bitmapPlanes=NSZoneCalloc(NULL,1,sizeof(unsigned char *));
    _bitmapPlanes[0]=NSZoneCalloc(NULL,_bytesPerRow*_pixelsHigh,1);
   
    if(_cgImage!=NULL){
     CGBitmapInfo         bitmapInfo=CGImageGetBitmapInfo(_cgImage);
     CGDataProviderRef    provider=CGImageGetDataProvider(_cgImage);
// FIXME: inefficient but there is no API to get mutable bytes out of an image or image source
     CFDataRef            bitmapData=CGDataProviderCopyData(provider);
     const unsigned char *bytes=CFDataGetBytePtr(bitmapData);
     int                  i,length=_bytesPerRow*_pixelsHigh;
   
     if(bitmapInfo==(kCGImageAlphaPremultipliedLast|kCGBitmapByteOrder32Big)){
     for(i=0;i<length;i++)
      _bitmapPlanes[0][i]=bytes[i];
     }
     else {
      for(i=0;i<length;i+=4){
       unsigned char b=bytes[i+0];
       unsigned char g=bytes[i+1];
       unsigned char r=bytes[i+2];
       unsigned char a=bytes[i+3];

       _bitmapPlanes[0][i+0]=r;
       _bitmapPlanes[0][i+1]=g;
       _bitmapPlanes[0][i+2]=b;
       _bitmapPlanes[0][i+3]=a;
      }
     }
     CFRelease(bitmapData);
    }
   }
}

-initWithCGImage:(CGImageRef)cgImage {
   _cgImage=CGImageRetain(cgImage);
   _size.width=CGImageGetWidth(_cgImage);
   _size.height=CGImageGetHeight(_cgImage);

   CGColorSpaceRef colorSpace=CGImageGetColorSpace(_cgImage);
   
   // FIXME:
   _colorSpaceName=NSDeviceRGBColorSpace;
   _bitsPerSample=CGImageGetBitsPerComponent(_cgImage);
   _pixelsWide=CGImageGetWidth(_cgImage);
   _pixelsHigh=CGImageGetHeight(_cgImage);

   switch(CGImageGetAlphaInfo(_cgImage)){
    case kCGImageAlphaPremultipliedLast:
    case kCGImageAlphaPremultipliedFirst:
    case kCGImageAlphaLast:
    case kCGImageAlphaFirst:
     _hasAlpha=YES;
     break;
    default:
     _hasAlpha=NO;
     break;
   }
   
   _samplesPerPixel=CGColorSpaceGetNumberOfComponents(colorSpace);
   if(_hasAlpha)
    _samplesPerPixel++;
   _isPlanar=NO;
   _bitmapFormat=0;
   if(CGImageGetBitmapInfo(_cgImage)&kCGBitmapFloatComponents){
    _bitmapFormat|=NSFloatingPointSamplesBitmapFormat;
   }
   switch(CGImageGetAlphaInfo(_cgImage)){
    case kCGImageAlphaNone:
     break;
    case kCGImageAlphaPremultipliedLast:
     break;
    case kCGImageAlphaPremultipliedFirst:
     _bitmapFormat|=NSAlphaFirstBitmapFormat;
     break;
    case kCGImageAlphaLast:
     _bitmapFormat|=NSAlphaNonpremultipliedBitmapFormat;
     break;
    case kCGImageAlphaFirst:
     _bitmapFormat|=NSAlphaFirstBitmapFormat;
     _bitmapFormat|=NSAlphaNonpremultipliedBitmapFormat;
     break;
    case kCGImageAlphaNoneSkipLast:
    case kCGImageAlphaNoneSkipFirst:
     break;
    case kCGImageAlphaOnly:
     break;
   }
    
   _bitsPerPixel=CGImageGetBitsPerPixel(_cgImage);
   _bytesPerRow=CGImageGetBytesPerRow(_cgImage);
   _freeWhenDone=NO;
   
//   [self createBitmapIfNeeded];
   
   return self;
}

   
-(void)dealloc {
   if(_freeWhenDone){
    if(_bitmapPlanes!=NULL){
     int i,numberOfPlanes=[self numberOfPlanes];
   
     for(i=0;i<numberOfPlanes;i++)
      if(_bitmapPlanes[i]!=NULL)
       NSZoneFree(NULL,_bitmapPlanes[i]);
       
}
   }
	if(_bitmapPlanes!=NULL){
	NSZoneFree(NULL,_bitmapPlanes);
	}
   CGImageRelease(_cgImage);
   [super dealloc];
}


-(int)incrementalLoadFromData:(NSData *)data complete:(BOOL)complete {
   NSUnimplementedMethod();
   return 0;
}


-(int)bitsPerPixel {
   return _bitsPerPixel;
}

-(int)samplesPerPixel {
   return _samplesPerPixel;
}

-(int)bytesPerRow {
   return _bytesPerRow;
}

-(BOOL)isPlanar {
   return _isPlanar;
}

-(int)numberOfPlanes {
   return _isPlanar?_samplesPerPixel:1;
}

-(int)bytesPerPlane {
   return _bytesPerPlane;
}

-(NSBitmapFormat)bitmapFormat {
   return _bitmapFormat;
}

-(unsigned char *)bitmapData {
   [self createBitmapIfNeeded];
   
   return _bitmapPlanes[0];
}

-(void)getBitmapDataPlanes:(unsigned char **)planes {
   [self createBitmapIfNeeded];

   int i,numberOfPlanes=[self numberOfPlanes];

   for(i=0;i<numberOfPlanes;i++)
    planes[i]=_bitmapPlanes[i];
    
   for(;i<5;i++)
    planes[i]=NULL;
}

-(void)getPixel:(NSUInteger[])pixel atX:(NSInteger)x y:(NSInteger)y
{
   NSUnimplementedMethod();
}

-(void)setPixel:(NSUInteger[])pixel atX:(NSInteger)x y:(NSInteger)y
{
   NSAssert(x>=0 && x<[self pixelsWide],@"x out of bounds");
   NSAssert(y>=0 && y<[self pixelsHigh],@"y out of bounds");

   [self createBitmapIfNeeded];
   
	if(_isPlanar) {
		NSUnimplementedMethod();
	} else {
		if(_bitsPerPixel/_samplesPerPixel!=8) {
			NSUnimplementedMethod();
		}
		unsigned char *bits=_bitmapPlanes[0]+_bytesPerRow*y+(x*_bitsPerPixel)/8;
    
		int i;
   
		for( i = 0; i < _samplesPerPixel; i++) {
			bits[i]=pixel[i];
		}
	}
}

-(NSColor *)colorAtX:(NSInteger)x y:(NSInteger)y {   
   NSUnimplementedMethod();
   return nil;
}

-(void)setColor:(NSColor *)color atX:(NSInteger)x y:(NSInteger)y
{
	// Convert the color to a compatible format
   color=[color colorUsingColorSpaceName:[self colorSpaceName]];

   NSInteger i,numberOfComponents=[color numberOfComponents];
   CGFloat   components[numberOfComponents];
   unsigned  pixels[numberOfComponents];

	// Extract the RGBA components
   [color getComponents:components];
   
	if(!_hasAlpha) {
		// No alpha - then drop the component count  
		numberOfComponents--;
	} else {
		// Deal with the alpha component
		if((_bitmapFormat & NSAlphaNonpremultipliedBitmapFormat) == NO) { // premultiplied
			CGFloat alpha=components[numberOfComponents-1];

			// Multiply through the alpha
			for(i=0;i<numberOfComponents-1;i++) {
				components[i]*=alpha;
			}
		}
	
		if(_bitmapFormat&NSAlphaFirstBitmapFormat) {
			// Swap the location of the alpha component
			CGFloat alpha=components[numberOfComponents-1];
		 
			for(i=numberOfComponents;--i>=1;) {
				components[i]=components[i-1];
			}
			components[0]=alpha;
		}
	}
	
	if(_bitmapFormat&NSFloatingPointSamplesBitmapFormat){
		for(i=0;i<numberOfComponents;i++) {
			((CGFloat *)pixels)[i]=MAX(0.0f,MIN(1.0f,components[i])); // clamp just in case
		}
	} else {
		int maxValue=(1<<[self bitsPerSample])-1;
    
		for(i=0;i<numberOfComponents;i++){
#ifdef __LITTLE_ENDIAN__
			pixels[i]=MAX(0,MIN(maxValue,(int)(components[(numberOfComponents - 1) - i]*maxValue))); // clamp just in case
#else
			pixels[i]=MAX(0,MIN(maxValue,(int)(components[i]*maxValue))); // clamp just in case
#endif
		}
   }
   
   [self setPixel:pixels atX:x y:y];
}

-valueForProperty:(NSString *)property {
   return [_properties objectForKey:property];
}

-(void)setProperty:(NSString *)property withValue:value {
   [_properties setObject:value forKey:property];
}

-(void)colorizeByMappingGray:(CGFloat)gray toColor:(NSColor *)color blackMapping:(NSColor *)blackMapping whiteMapping:(NSColor *)whiteMapping {
   NSUnimplementedMethod();
}

-(void)getCompression:(NSTIFFCompression *)compression factor:(float *)factor {
   NSUnimplementedMethod();
}

-(void)setCompression:(NSTIFFCompression)compression factor:(float)factor {
   NSUnimplementedMethod();
}

-(BOOL)canBeCompressedUsing:(NSTIFFCompression)compression {
   NSUnimplementedMethod();
   return NO;
}

-(NSData *)representationUsingType:(NSBitmapImageFileType)type properties:(NSDictionary *)properties {
   CFStringRef uti;
   
   switch(type){
   
    case NSTIFFFileType:
     uti=(CFStringRef)@"public.tiff";
     break;
     
    case NSBMPFileType:
     uti=(CFStringRef)@"com.microsoft.bmp";
     break;
     
    case NSGIFFileType:
     uti=(CFStringRef)@"com.compuserve.gif";
     break;
     
    case NSJPEGFileType:
     uti=(CFStringRef)@"public.jpeg";
     break;
     
    case NSPNGFileType:
     uti=(CFStringRef)@"public.png";
     break;
     
    case NSJPEG2000FileType:
     uti=(CFStringRef)@"public.jpeg-2000";
     break;
    
    default:
     return nil;
   }

    int dpi = 72;
    if (_size.width > 0) {
        dpi = ceilf(72 * _pixelsWide / _size.width);
    }
   NSMutableData        *result=[NSMutableData data];
	// Convert the NS options to CG options - just NSImageCompressionFactor for now
	NSDictionary *CGProperties = [NSMutableDictionary dictionary];

    [CGProperties setValue: [NSNumber numberWithInt: dpi] forKey: (id)kCGImageDestinationDPI];
    
	if ([properties count]) {
		id compressionFactor = [properties valueForKey:NSImageCompressionFactor];
		if (compressionFactor) {
			[CGProperties setValue:compressionFactor forKey:(id)kCGImageDestinationLossyCompressionQuality];
		}
	}
   CGImageDestinationRef dest=CGImageDestinationCreateWithData((CFMutableDataRef)result,uti,1,(CFDictionaryRef)CGProperties);
   
   CGImageDestinationAddImage(dest,[self CGImage],(CFDictionaryRef)CGProperties);

   CGImageDestinationFinalize(dest);
   CFRelease(dest);
   
   return result;
}

-(NSData *)TIFFRepresentation {
   return [self TIFFRepresentationUsingCompression:NSTIFFCompressionNone factor:0.0];
}

-(NSData *)TIFFRepresentationUsingCompression:(NSTIFFCompression)compression factor:(float)factor {
   return [[self class] TIFFRepresentationOfImageRepsInArray:[NSArray arrayWithObject:self]
											usingCompression:compression 
													  factor:factor];
}

-(CGImageRef)createCGImageIfNeeded {
   if(_cgImage!=NULL)
    return CGImageRetain(_cgImage);
    
   if(_isPlanar)
    NSUnimplementedMethod();
    
  CGDataProviderRef provider=CGDataProviderCreateWithData(NULL,_bitmapPlanes[0],_bytesPerRow*_pixelsHigh,NULL);
  
  CGImageRef image=CGImageCreate(_pixelsWide,_pixelsHigh,_bitsPerPixel/_samplesPerPixel,_bitsPerPixel,_bytesPerRow,[self CGColorSpace],
     [self CGBitmapInfo],provider,NULL,NO,kCGRenderingIntentDefault);
     
   CGDataProviderRelease(provider);
  
  return image;
}

-(CGImageRef)CGImage {
   if(_cgImage!=NULL)
    return _cgImage;
    
   return (CGImageRef)[(id)[self createCGImageIfNeeded] autorelease];
}

-(BOOL)draw {
   CGContextRef context=NSCurrentGraphicsPort();
   NSSize size=[self size];
   CGImageRef image=[self createCGImageIfNeeded];
   
   CGContextDrawImage(context,NSMakeRect(0,0,size.width,size.height),image);
   
   CGImageRelease(image);
   
   return YES;
}

-(CGColorSpaceRef)CGColorSpace {
   if([_colorSpaceName isEqualToString:NSDeviceRGBColorSpace])
    return (CGColorSpaceRef)[(id)CGColorSpaceCreateDeviceRGB() autorelease];
   if([_colorSpaceName isEqualToString:NSCalibratedRGBColorSpace])
    return (CGColorSpaceRef)[(id)CGColorSpaceCreateDeviceRGB() autorelease];

   return NULL;
}

-(CGBitmapInfo)CGBitmapInfo {
   CGBitmapInfo result=kCGBitmapByteOrderDefault;
	
   if(![self hasAlpha])
    result|=kCGImageAlphaNone;
   else {
    if(_bitmapFormat&NSAlphaFirstBitmapFormat){
     if(_bitmapFormat&NSAlphaNonpremultipliedBitmapFormat)
      result|=kCGImageAlphaFirst;
     else
      result|=kCGImageAlphaPremultipliedFirst;
    }
    else {
     if(_bitmapFormat&NSAlphaNonpremultipliedBitmapFormat)
      result|=kCGImageAlphaLast;
     else
      result|=kCGImageAlphaPremultipliedLast;
    }
   }
   if(_bitmapFormat&NSFloatingPointSamplesBitmapFormat)
    result|=kCGBitmapFloatComponents;

   return result;
}

@end