/*
  Copyright (c) 2004-2006, Marcus Müller <znek@mulle-kybernetik.com>.
  Copyright (c) 2006, Michael Maier <micha@mulle-kybernetik.com>.
  All rights reserved.


  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

  - Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

  - Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

  - Neither the name of Mulle kybernetiK nor the 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.
*/

#include "CIView.h"
#include "common.h"

@implementation CIView

/**
 * We use the focused view for rendering => NO
 */
- (BOOL)useOpenGLForDrawing {
  return NO;
}

/**
 * Cleanup
 */
- (void)dealloc {
  [self->effectFilter release];
  [self->flipFilter   release];
  [super dealloc];
}

/**
 * Returns the filter
 */
- (CIFilter *)effectiveFilter {
  if (!self->effectFilter) {
    self->effectFilter = [[CIFilter filterWithName:@"CIMotionBlur"] retain];
    [self->effectFilter setDefaults];
  }
  return self->effectFilter;
}

/**
 * Returns the flip filter
 */
- (CIFilter *)flipFilter {
  if (!self->flipFilter) {
    NSAffineTransform *transform, *singleTransform;
    
    self->flipFilter = [[CIFilter filterWithName:@"CIAffineTransform"] retain];
    [self->flipFilter setDefaults];
    
    transform       = [NSAffineTransform transform];
    singleTransform = [NSAffineTransform transform];
    [singleTransform scaleXBy:-1 yBy:1];
    [transform appendTransform:singleTransform];
    singleTransform = [NSAffineTransform transform];
    [singleTransform translateXBy:640 yBy:0];	/** todo: change this */
    [transform appendTransform:singleTransform];
    [self->flipFilter setValue:transform forKey:@"inputTransform"];
  }
  return self->flipFilter;
}

- (void)openGLdrawRect:(NSRect)rect {
  // should we use OpenGL...
  if ([self useOpenGLForDrawing]) {
    // set context to current
    [self->context makeCurrentContext];
    
    // clear color for OpenGL
    glClearColor( 0, 0, 0, 0 );
    
    // only color buffer
    glClear( GL_COLOR_BUFFER_BIT );
    
    if (self->currentFrame) {
      CIFilter *f;
      CIImage  *inputImage;;		
      CGRect   imageRect;

      inputImage = [CIImage imageWithCVImageBuffer:self->currentFrame];
      f          = [self effectiveFilter];	
      [f setValue:inputImage forKey:@"inputImage"];
      imageRect  = [inputImage extent];

      glPushMatrix();
      // For live video, flip horizontally as if you're looking in a mirror (a-la iChat)
      glScalef( -1, 1, 1 );
      glTranslatef( -imageRect.size.width, 0, 0 );
      
      [[self ciContext] drawImage:[f valueForKey:@"outputImage"] 
                        atPoint:CGPointZero
                        fromRect:imageRect];
          
      glPopMatrix();		
    }
    glFlush();		  	
  }
  else {
    if (self->currentFrame) {
      CIImage  *inputImage, *outputImage;
      CIFilter *ff, *ef;
      CGRect   imageRect;
      NSRect   destRect;

      inputImage = [CIImage imageWithCVImageBuffer:self->currentFrame];
      ff         = [self flipFilter];
      [ff setValue:inputImage forKey:@"inputImage"];

      inputImage  = [ff valueForKey:@"outputImage"];
      ef          = [self effectiveFilter];
      [ef setValue:inputImage forKey:@"inputImage"];

      imageRect   = [inputImage extent];
      destRect    = NSMakeRect(0.0,
                               0.0,
                               imageRect.size.width,
                               imageRect.size.height);

      outputImage = [ff valueForKey:@"outputImage"];
	  
      [outputImage drawInRect:rect
                   fromRect:destRect
                   operation:NSCompositeCopy
                   fraction:1];
    }
  }
}

/**
 * We need some modifications for the projection
 */
- (void)update:(NSNotification*)_notif {  
  NSRect  bounds, frame;
  GLfloat minX, minY, maxX, maxY;

  [super update:_notif];

  bounds = [self bounds];
  frame  = [self frame];
  
  minX = NSMinX(bounds);
  minY = NSMinY(bounds);
  maxX = NSMaxX(bounds);
  maxY = NSMaxY(bounds);

  // now some OpenGL magic

  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  glViewport(0, 0, frame.size.width, frame.size.height);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glOrtho(minX*2, maxX*2, minY*2, maxY*2, -1.0, 1.0);
}

@end /* CIView */