GenerateThumbnailForURL.m

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  Copyright (c) 2009, Limbic Software, Inc.
  All rights reserved.
  
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  modification, are permitted provided that the following conditions are met:
      * Redistributions of source code must retain the above copyright
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        documentation and/or other materials provided with the distribution.
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        names of its contributors may be used to endorse or promote products
        derived from this software without specific prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY LIMBIC SOFTWARE, INC. ''AS IS'' AND ANY
  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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#include <CoreFoundation/CoreFoundation.h>
#include <CoreServices/CoreServices.h>
#include <QuickLook/QuickLook.h>

#include <Cocoa/Cocoa.h>
#include "pvr.h"

/* -----------------------------------------------------------------------------
    Generate a thumbnail for file

   This function's job is to create thumbnail for designated file as fast as possible
   ----------------------------------------------------------------------------- */

extern "C" OSStatus GenerateThumbnailForURL(void *thisInterface, QLThumbnailRequestRef thumbnail, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options, CGSize maxSize)
{
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    // Read the PVR file
    PVRTexture pvr;

    NSString *targetCFS = [[(NSURL *)url absoluteURL] path];
    int res = pvr.load(targetCFS.UTF8String);
    if(res!=PVR_LOAD_OKAY && res!=PVR_LOAD_UNKNOWN_TYPE)
    {
        [pool release];
        return noErr;
    }
	
    // create the render context
	NSSize canvasSize = NSMakeSize(pvr.width, pvr.height);
    CGContextRef cgContext = QLThumbnailRequestCreateContext(thumbnail, *(CGSize *)&canvasSize, false, NULL);
	if(cgContext) 
    {
        NSGraphicsContext* context = [NSGraphicsContext graphicsContextWithGraphicsPort:(void *)cgContext flipped:NO];
		
		if(context) 
        {
			[NSGraphicsContext saveGraphicsState];
			[NSGraphicsContext setCurrentContext:context];
			[context saveGraphicsState];
			
			int w = pvr.width;
			int h = pvr.height;
            if(pvr.data)
            {
                uint8_t *buffer = pvr.data;
			    
			    CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, buffer, (w * h * 4), NULL);
			    
			    int bitsPerComponent = 8;
			    int bitsPerPixel = 32;
			    int bytesPerRow = 4 * w;
			    CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
			    CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault| kCGImageAlphaLast;
			    CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;
			    CGImageRef image = CGImageCreate(w, h, bitsPerComponent, 
			    	bitsPerPixel, bytesPerRow, colorSpaceRef, bitmapInfo, provider, 
			    	NULL, NO, renderingIntent);
          if (pvr.should_flip == true) {
            CGContextTranslateCTM(cgContext, 0.0f, h);
            CGContextScaleCTM(cgContext, 1.0f, -1.0f);
          }
			    CGContextDrawImage((CGContext*)[context graphicsPort], CGRectMake(0,0,w-1,h-1), image);
          if (pvr.should_flip == true) {
            CGContextScaleCTM(cgContext, 1.0f, -1.0f);
            CGContextTranslateCTM(cgContext, 0.0f, -h);
          }
      }
			[context restoreGraphicsState];
			[NSGraphicsContext restoreGraphicsState];
		}
	
        QLThumbnailRequestFlushContext(thumbnail, cgContext);
        CFRelease(cgContext);
    }
	
	[pool release];
	return noErr;
}

extern "C" void CancelThumbnailGeneration(void* thisInterface, QLThumbnailRequestRef thumbnail)
{
    // implement only if supported
}