/*

        File: ImageExporterPlugIn.m

    Abstract: ImageExporterPlugin class.

     Version: 1.0

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*/

/* It's highly recommended to use CGL macros instead of changing the current context for plug-ins that perform OpenGL rendering */

#import <OpenGL/CGLMacro.h>

#import "ImageExporterPlugIn.h"

#define kQCPlugIn_Name              @"Image Exporter"

#define kQCPlugIn_Description       @"Writes the input image as a series of .png files to disk."

@implementation ImageExporterPlugIn

/* We need to declare the input / output properties as dynamic as Quartz Composer will handle their implementation */

@dynamic inputImage, inputPath;

+ (NSDictionary*) attributes

{

    /* Return the attributes of this plug-in */

    return [NSDictionary dictionaryWithObjectsAndKeys:kQCPlugIn_Name, QCPlugInAttributeNameKey, kQCPlugIn_Description, QCPlugInAttributeDescriptionKey, nil];

}

+ (NSDictionary*) attributesForPropertyPortWithKey:(NSString*)key

{

    /* Return the attributes for the plug-in property ports */

    if([key isEqualToString:@"inputImage"])

    return [NSDictionary dictionaryWithObjectsAndKeys:@"Image", QCPortAttributeNameKey, nil];

    if([key isEqualToString:@"inputPath"])

    return [NSDictionary dictionaryWithObjectsAndKeys:@"Destination Path", QCPortAttributeNameKey, @"~/Desktop", QCPortAttributeDefaultValueKey, nil];

    return nil;

}

+ (QCPlugInExecutionMode) executionMode

{

    /* This plug-in is a consumer (it renders to image files) */

    return kQCPlugInExecutionModeConsumer;

}

+ (QCPlugInTimeMode) timeMode

{

    /* This plug-in does not depend on the time (time parameter is completely ignored in the -execute:atTime:withArguments: method) */

    return kQCPlugInTimeModeNone;

}

@end

@implementation ImageExporterPlugIn (Execution)

- (BOOL) startExecution:(id<QCPlugInContext>)context

{

    /* Reset image file index */

    _index = 0;

    return YES;

}

- (BOOL) execute:(id<QCPlugInContext>)context atTime:(NSTimeInterval)time withArguments:(NSDictionary*)arguments

{

    id<QCPlugInInputImageSource>    qcImage = self.inputImage;

    NSString*                       pixelFormat;

    CGColorSpaceRef                 colorSpace;

    CGDataProviderRef               dataProvider;

    CGImageRef                      cgImage;

    CGImageDestinationRef           imageDestination;

    NSURL*                          fileURL;

    BOOL                            success;

    /* Make sure we have a new image */

    if(![self didValueForInputKeyChange:@"inputImage"] || !qcImage || ![self.inputPath length])

    return YES;

    /* Figure out pixel format and colorspace to use */

    colorSpace = [qcImage imageColorSpace];

    if(CGColorSpaceGetModel(colorSpace) == kCGColorSpaceModelMonochrome)

    pixelFormat = QCPlugInPixelFormatI8;

    else if(CGColorSpaceGetModel(colorSpace) == kCGColorSpaceModelRGB)

#if __BIG_ENDIAN__

    pixelFormat = QCPlugInPixelFormatARGB8;

#else

    pixelFormat = QCPlugInPixelFormatBGRA8;

#endif

    else

    return NO;

    /* Get a buffer representation from the image in its native colorspace */

    if(![qcImage lockBufferRepresentationWithPixelFormat:pixelFormat colorSpace:colorSpace forBounds:[qcImage imageBounds]])

    return NO;

    /* Create CGImage from buffer */

    dataProvider = CGDataProviderCreateWithData(NULL, [qcImage bufferBaseAddress], [qcImage bufferPixelsHigh] * [qcImage bufferBytesPerRow], NULL);

    cgImage = CGImageCreate([qcImage bufferPixelsWide], [qcImage bufferPixelsHigh], 8, (pixelFormat == QCPlugInPixelFormatI8 ? 8 : 32), [qcImage bufferBytesPerRow], colorSpace, (pixelFormat == QCPlugInPixelFormatI8 ? 0 : kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host), dataProvider, NULL, false, kCGRenderingIntentDefault);

    CGDataProviderRelease(dataProvider);

    if(cgImage == NULL) {

        [qcImage unlockBufferRepresentation];

        return NO;

    }

    /* Write CGImage to disk as PNG file */

    fileURL = [NSURL fileURLWithPath:[[self.inputPath stringByStandardizingPath] stringByAppendingPathComponent:[NSString stringWithFormat:@"Image-%05i.png", ++_index]]];

    imageDestination = (fileURL ? CGImageDestinationCreateWithURL((CFURLRef)fileURL, kUTTypePNG, 1, NULL) : NULL);

    if(imageDestination == NULL) {

        CGImageRelease(cgImage);

        [qcImage unlockBufferRepresentation];

        return NO;

    }

    CGImageDestinationAddImage(imageDestination, cgImage, NULL);

    success = CGImageDestinationFinalize(imageDestination);

    CFRelease(imageDestination);

    /* Destroy CGImage */

    CGImageRelease(cgImage);

    /* Release buffer representation */

    [qcImage unlockBufferRepresentation];

    return success;

}

@end