/*

File: CIDraw.m

Author: QuickTime DTS

Change History (most recent first): <1> 2/8/06 initial release

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#import <QuartzCore/QuartzCore.h>

#include "CIDraw.h"

// globals

static CIFilter *gPixellateFilter = nil;

static CIFilter *gPointillizeFilter = nil;

static CIContext *gCIContext = nil;

static CIImage *gTextImagePtr = nil;

static CGRect gTextLayerRect = { 0.0, 0.0, 250.0, 140.0 };

Boolean gButtonValue = 1;

SInt32 gSliderValue = 3;

const float semiTransparentGreen[] = { 0.0, 1.0, 0.0, 0.4 };

static void drawRomanText(CGContextRef context, CGRect destRect)

{

    static const char *text = "CARBON";

    size_t textlen = strlen(text);

    static const float fontSize = 60;

    // set the fill color space

    CGContextSetFillColorSpace(context, CGColorSpaceCreateDeviceRGB());

    // set the stroke color

    CGContextSetRGBStrokeColor(context, 0.0, 0.0, 0.0, 1.0);

    // set the fill color

    CGContextSetFillColor(context, semiTransparentGreen);

    // the Cocoa framework calls the draw method with an undefined

    // text matrix. It's best to set it to what is needed by

    // this code: the identity transform

    CGContextSetTextMatrix(context, CGAffineTransformIdentity);

    // choose the font with the PostScript name "Times-Roman", at

    // fontSize points, with the encoding MacRoman encoding

    CGContextSelectFont(context, "Times-Roman", fontSize, kCGEncodingMacRoman);

    // font smoothing

    CGContextSetShouldSmoothFonts(context, true);

    // we want a shadaw because it's cool

    CGContextSetShadow(context, CGSizeMake(5, -20), 1.0);

    // set the drawing mode

    CGContextSetTextDrawingMode(context, kCGTextFillStroke);

    // draw the text

    CGContextShowTextAtPoint(context, 0, 70, text, textlen);

}

// create the CI effect filters, the CIContext and the text image

void InitializeCIFilters(CGLContextObj inCGLContext, CGLPixelFormatObj inCGLPixelFormat)

{

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

    gPixellateFilter = [[CIFilter filterWithName:@"CIPixellate"] retain];  // edgework filter  

    [gPixellateFilter setDefaults];      // set the filter to its default values

    gPointillizeFilter = [[CIFilter filterWithName:@"CIPointillize"] retain];  // pixellate filter  

    [gPointillizeFilter setDefaults];   // set the filter to its default values

    gCIContext = [[CIContext contextWithCGLContext:inCGLContext pixelFormat:inCGLPixelFormat options:nil] retain];

    CGLayerRef layer = [gCIContext createCGLayerWithSize:gTextLayerRect.size info: nil];

    CGContextRef context = CGLayerGetContext(layer);

    drawRomanText(context, gTextLayerRect);

    gTextImagePtr = [[CIImage alloc] initWithCGLayer:layer];

    CGLayerRelease(layer);

    [pool release];

}

// draw the frame processed though Core Image

void DoDraw(CVImageBufferRef inCurrentFrame, CGRect inBounds)

{

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

    CIImage *inputImage = [CIImage imageWithCVImageBuffer:inCurrentFrame];

    if (NULL == inputImage) goto done;

    // make sure to get the image extent before applying any filters -- it is the

    // rectangle that specifies the x-value of the rectangle origin, the y-value of

    // the rectangle origin, and the width and height in working space coordinates

    CGRect imageRect = [inputImage extent];

    if (1 == gButtonValue) {

        [gPixellateFilter setValue:inputImage forKey:@"inputImage"];

        [gPixellateFilter setValue:[NSNumber numberWithInt:gSliderValue] forKey:@"inputScale"];

        // render our resulting image into our context

        // this call will scale the frame to fit the content bounds of the window

        [gCIContext drawImage: [gPixellateFilter valueForKey:@"outputImage"] 

                    inRect:CGRectMake(0, 0, inBounds.size.width, inBounds.size.height)

                    fromRect:imageRect];

    } else {

        [gPointillizeFilter setValue:inputImage forKey:@"inputImage"];

        [gPointillizeFilter setValue:[NSNumber numberWithFloat:gSliderValue] forKey:@"inputRadius"];

        // render our resulting image into our context

        // this call will scale the frame to fit the content bounds of the window

        [gCIContext drawImage: [gPointillizeFilter valueForKey:@"outputImage"] 

                    inRect:CGRectMake(0, 0, inBounds.size.width, inBounds.size.height)

                    fromRect:imageRect];

    }

    // you can just as easily use the CISourceOverCompositing filter instead of drawing

    // this image separately...however, in this case we didn't want this layer to be scaled

    // along with the video frame so we chose to do it this way

    // using the CISourceOverCompositing filter is more efficent if it fits your needs.

    [gCIContext drawImage:gTextImagePtr 

            atPoint: CGPointMake((int)((inBounds.size.width - gTextLayerRect.size.width) * 0.5),

                                 (int)((inBounds.size.height - gTextLayerRect.size.height) * 0.5))

            fromRect:gTextLayerRect];

done:

    glFlush();

    [pool release];

}