#import "CCTexture2DMutable.h"

@implementation Ch1_MutablePaletteSwapping

-(CCLayer*) runRecipe {
  //Create a nice looking background
  CCSprite *bg = [CCSprite spriteWithFile:@"baseball_bg_01.png"];
  [bg setPosition:ccp(240,160)];
  bg.opacity = 100;
  [self addChild:bg z:0 tag:0];

  /*** Animate 4 different fielders with different color combinations ***/

  //Set color arrays
  ccColor4B colors1[] = { ccc4(255,217,161,255), ccc4(225,225,225,255), ccc4(0,0,150,255) };
  ccColor4B colors2[] = { ccc4(140,100,46,255), ccc4(150,150,150,255), ccc4(255,0,0,255) };
  ccColor4B colors3[] = { ccc4(255,217,161,255), ccc4(115,170,115,255), ccc4(115,170,115,255) };
  ccColor4B colors4[] = { ccc4(140,100,46,255),  ccc4(50,50,50,255), ccc4(255,255,0,255) };

  //Create texture copy to use as an immutable guide.
  CCTexture2DMutable* textureCopy = [[[CCTexture2DMutable alloc] initWithImage:[UIImage imageNamed:@"fielder_run_sentinel_colors.png"]] autorelease];

  //Create our sprites using mutable textures.
  CCSprite *sprite1 = [CCSprite spriteWithTexture:[[[CCTexture2DMutable alloc] initWithImage:[UIImage imageNamed:@"fielder_run_sentinel_colors.png"]] autorelease]];
  CCSprite *sprite2 = [CCSprite spriteWithTexture:[[[CCTexture2DMutable alloc] initWithImage:[UIImage imageNamed:@"fielder_run_sentinel_colors.png"]] autorelease]];
  CCSprite *sprite3 = [CCSprite spriteWithTexture:[[[CCTexture2DMutable alloc] initWithImage:[UIImage imageNamed:@"fielder_run_sentinel_colors.png"]] autorelease]];
  CCSprite *sprite4 = [CCSprite spriteWithTexture:[[[CCTexture2DMutable alloc] initWithImage:[UIImage imageNamed:@"fielder_run_sentinel_colors.png"]] autorelease]];

  //Set sprite positions
  [sprite1 setPosition:ccp(125,75)];
  [sprite2 setPosition:ccp(125,225)];
  [sprite3 setPosition:ccp(325,75)];
  [sprite4 setPosition:ccp(325,225)];

  //Swap colors in each sprite mutable texture and apply the changes.
  [self swapColor:ccc4(0,0,255,255) withColor:colors1[0] inTexture:sprite1.texture withCopy:textureCopy];
  [self swapColor:ccc4(0,255,0,255) withColor:colors1[1] inTexture:sprite1.texture withCopy:textureCopy];
  [self swapColor:ccc4(255,0,0,255) withColor:colors1[2] inTexture:sprite1.texture withCopy:textureCopy];
  [sprite1.texture apply];

  /* CODE OMITTED */

  //Finally, add the sprites to the scene.
  [self addChild:sprite1 z:0 tag:0];
  [self addChild:sprite2 z:0 tag:1];
  [self addChild:sprite3 z:0 tag:2];
  [self addChild:sprite4 z:0 tag:3];
  
  return self;
}

-(void) swapColor:(ccColor4B)color1 withColor:(ccColor4B)color2 inTexture:(CCTexture2DMutable*)texture withCopy:(CCTexture2DMutable*)copy {
  //Look through the texture, find all pixels of the specified color and change them.
  //We use a tolerance of 200 here.
  for(int x=0; x<texture.pixelsWide; x++){
    for(int y=0; y<texture.pixelsHigh; y++){
      if( [self isColor:[copy pixelAt:ccp(x,y)] equalTo:color1 withTolerance:200] ){
        [texture setPixelAt:ccp(x,y) rgba:color2];
      }
    }
  }    
}

-(bool) isColor:(ccColor4B)color1 equalTo:(ccColor4B)color2 withTolerance:(int)tolerance {
  //If the colors are equal within a tolerance we change them.
  bool equal = YES;
  if( abs(color1.r - color2.r) + abs(color1.g - color2.g) + 
    abs(color1.b - color2.b) + abs(color1.a - color2.a) > tolerance ){
      equal = NO;
  }
  return equal;
}

@end