/*

 File: GenerateThumbnailForURL.m

 Abstract: This is the code to generate Quick Look thumbnails for Sketch documents

 Version: 1.0

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 */

#include <CoreFoundation/CoreFoundation.h>

#include <CoreServices/CoreServices.h>

#include <QuickLook/QuickLook.h>

/* -----------------------------------------------------------------------------

 Generate a thumbnail for file

 This function's job is to create thumbnail for designated file (as fast as possible!)

 ----------------------------------------------------------------------------- */

#import "SKTDrawDocument.h"

OSStatus GenerateThumbnailForURL(void *thisInterface, QLThumbnailRequestRef thumbnail, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options, CGSize maxSize)

{

    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

    // Create and read the document file

    SKTDrawDocument* document = [[SKTDrawDocument alloc] init];

    if(![document readFromURL:(NSURL *)url ofType:(NSString *)contentTypeUTI]) {

        [document release];

        [pool release];

        return noErr;

    }

    NSSize canvasSize = [document canvasSize];

    // Thumbnail will be drawn with maximum resolution for desired thumbnail request

    // Here we create a graphics context to draw the Quick Look Thumbnail in.

    CGContextRef cgContext = QLThumbnailRequestCreateContext(thumbnail, *(CGSize *)&canvasSize, false, NULL);

    if(cgContext) {

        NSGraphicsContext* context = [NSGraphicsContext graphicsContextWithGraphicsPort:(void *)cgContext flipped:YES];

        if(context) {

            //These two lines of code are just good safe programming...

            [NSGraphicsContext saveGraphicsState];

            [NSGraphicsContext setCurrentContext:context];

            //Normally you'd want to do something much more lightweight for a thumbnail,

            //like load an pre-generated image embedded in the document or something

            //but for a quick and dirty sample, we'll just render the document here

            [document drawDocumentInContext:context];

            //This line sets the context back to what it was when we're done

            [NSGraphicsContext restoreGraphicsState];

        }

        // When we are done with our drawing code QLThumbnailRequestFlushContext() is called to flush the context

        QLThumbnailRequestFlushContext(thumbnail, cgContext);

        CFRelease(cgContext);

    }

    [pool release];

    return noErr;

}

void CancelThumbnailGeneration(void* thisInterface, QLThumbnailRequestRef thumbnail)

{

    // implement only if supported

}