/*

File: TimeCodeOverlay.m

Abstract:   Helper class to render QTTime into a CIImage.

Version: 1.0

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*/ 

#import "TimeCodeOverlay.h"

@implementation TimeCodeOverlay

- (id)initWithAttributes:(NSDictionary*)inFontAttributes targetSize:(NSSize)inTargetSize

{

    self = [super init];

    if (self == nil)

    return nil;

    CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();

    size_t      width, height, bytesPerRow;

    CGDataProviderRef   bitmapContextDataProvider;

    targetSize = inTargetSize;

    // setup the font attributes

    if(inFontAttributes)

    {

    fontAttributes = inFontAttributes;

    } else {

    fontAttributes = [NSDictionary dictionaryWithObjectsAndKeys:[NSFont messageFontOfSize:48.0] , NSFontAttributeName, nil];

    }

    [fontAttributes retain];

    //create the CGBitmapContext in which we will render into

    width = floor(targetSize.width);

    height = floor(targetSize.height);

    bytesPerRow = (width * 4 + 63) & ~63;

    bitmapData = calloc(bytesPerRow * height, 1);

    bitmapContext = CGBitmapContextCreate(bitmapData, width, height, 8 ,bytesPerRow, colorspace, kCGImageAlphaPremultipliedLast);

    graphicsContext = [[NSGraphicsContext graphicsContextWithGraphicsPort:bitmapContext flipped:NO] retain];

    bitmapContextDataProvider = CGDataProviderCreateWithData(nil, bitmapData, bytesPerRow * height, nil);

    bitmapImage = CGImageCreate(width,  

                height, 

                8, 

                32, 

                bytesPerRow, 

                colorspace, 

                kCGImageAlphaPremultipliedLast, 

                bitmapContextDataProvider, 

                nil, 

                false, 

                kCGRenderingIntentDefault);

    CGDataProviderRelease(bitmapContextDataProvider);

    CGColorSpaceRelease(colorspace);

    return self;

}

- (void)dealloc

{

    [graphicsContext release];

    [fontAttributes release];

    CGContextRelease(bitmapContext);

    CGImageRelease(bitmapImage);

    free(bitmapData);

    [super dealloc];

}

- (void)renderText:(NSString*)inString

{

    NSGraphicsContext   *savedContext = [NSGraphicsContext currentContext];

    NSSize  textSize = [inString sizeWithAttributes:fontAttributes];

    // render the text into the cleared context

    CGContextClearRect(bitmapContext,CGRectMake(0.0, 0.0, targetSize.width, targetSize.height));

    [NSGraphicsContext setCurrentContext:graphicsContext];

    [inString drawAtPoint:NSMakePoint((targetSize.width - textSize.width) * 0.5, (targetSize.height - textSize.height) * 0.5) withAttributes:fontAttributes];   // draw the text centered into our bitmap context

    if(savedContext)

    [NSGraphicsContext setCurrentContext:savedContext];

}

- (CIImage*)getImageForTime:(QTTime)inTime

{

    CIImage *textImage = nil;

    [self renderText:QTStringFromTime(inTime)]; 

    textImage = [CIImage imageWithCGImage:bitmapImage]; // return the CIImage of the rendering

    return textImage;

}

@end