skin.php

<?php
/* Copyright (c) 2010 Tyler Kennedy, Matvei Stefarov
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
*/
class MCSkin {
    private $image = NULL;
 
    function __destructor () {
        if ($this->image != NULL) {
            imagedestroy($this->image);
        }
    }
 
    // Loads the skin image from a file path
    function AssignSkinFromFile ($file) {
        if ($this->image != NULL) {
            imagedestroy($this->image);
        }
        if(($this->image = imagecreatefrompng($file)) == False) {
            // Error occured
            throw new Exception("Could not open PNG file.");
        }
        if(!$this->Valid()) {
            throw new Exception("Invalid skin image.");
        }
    }
 
    // Loads the skin image from a string
    function AssignSkinFromString ($data) {
        if ($this->image != NULL) {
            imagedestroy($this->image);
        }
        if(($this->image = imagecreatefromstring($data)) == False) {
            // Error occured
            throw new Exception("Could not load image data from string.");
        }
        if(!$this->Valid()) {
            throw new Exception("Invalid skin image.");
        }
    }
 
    // Returns the width of the skin.
    function Width () {
        if($this->image != NULL) {
            return imagesx($this->image);
        } else {
            throw new Exception("No skin loaded.");
        }
    }
 
    // Returns the height of the skin.
    function Height () {
        if($this->image != NULL) {
            return imagesy($this->image);
        } else {
            throw new Exception("No skin loaded.");
        }
    }
 
    // Returns true if the skin has valid dimensions, false otherwise.
    function Valid () {
        return ($this->Width() != 64 || $this->Height() != 32) ? False : True;
    }
 
    // Returns an image handle consisting of an (optionally) scaled front view of the skin.
    // $r, $g, $b are used to construct the background color.
    function FrontImage ($scale = 1, $r = 255, $g = 255, $b = 255) {
        $newWidth = 16 * $scale;
        $newHeight = 32 * $scale;
 
        $newImage = imagecreatetruecolor(16, 32);
        $background = imagecolorallocate($newImage, $r, $g, $b);
        imagefilledrectangle($newImage, 0, 0, 16, 32, $background);
 
        //copy head
    	imagecopy($newImage, $this->image, 4, 0, 8, 8, 8, 8);
    	//copy head mask
    	$this->imagecopyalpha($newImage, $this->image, 4, 0, 40, 8, 8, 8, imagecolorat($this->image, 63, 0));
    	//copy body
    	imagecopy($newImage, $this->image, 4, 8, 20, 20, 8, 12);
    	//copy left leg
    	imagecopy($newImage, $this->image, 8, 20, 4, 20, 4, 12);
    	//copy right leg
    	for($i = 4; $i > 0; $i--) {
    	    imagecopy($newImage, $this->image, 3 + $i, 20, 8 - $i, 20, 1, 12);
    	}
    	//copy right arm
    	for($i = 4; $i > 0; $i--) {
    	    imagecopy($newImage, $this->image, 11 + $i, 8, 48 - $i, 20, 1, 12);
    	}
    	//copy left arm
    	imagecopy($newImage, $this->image, 0, 8, 44, 20, 4, 12);
 
    	// Scale the image
    	if($scale != 1) {
    	    $resize = imagecreatetruecolor($newWidth, $newHeight);
    	    imagecopyresized($resize, $newImage, 0, 0, 0, 0, $newWidth, $newHeight, 16, 32);
    	    imagedestroy($newImage);
    	    return $resize;
    	}
 
        return $newImage;
    }
 
    // Returns an image handle consisting of an (optionally) scaled back view of the skin.
    // $r, $g, $b are used to construct the background color.
    function BackImage ($scale = 1, $r = 255, $g = 255, $b = 255) {
        $newWidth = 16 * $scale;
        $newHeight = 32 * $scale;
 
        $newImage = imagecreatetruecolor(16, 32);
        $background = imagecolorallocate($newImage, $r, $g, $b);
        imagefilledrectangle($newImage, 0, 0, 16, 32, $background);
 
        //copy head
    	imagecopy($newImage, $this->image, 4, 0, 24, 8, 8, 8);
    	//copy head mask
    	$this->imagecopyalpha($newImage, $this->image, 4, 0, 56, 8, 8, 8, imagecolorat($this->image, 63, 0));
    	//copy body
    	imagecopy($newImage, $this->image, 4, 8, 32, 20, 8, 12);
    	//copy left leg
    	for($i = 4; $i > 0; $i--) {
    	    imagecopy($newImage, $this->image, 7 + $i, 20, 16 - $i, 20, 1, 12);
    	}
    	//copy right leg
    	imagecopy($newImage, $this->image, 4, 20, 12, 20, 4, 12);
    	//copy right arm
    	imagecopy($newImage, $this->image, 12, 8, 52, 20, 4, 12);
    	//copy left arm
    	for($i = 4; $i > 0; $i--) {
    	    imagecopy($newImage, $this->image, $i - 1, 8, 56 - $i, 20, 1, 12);
    	}
 
    	// Scale the image
    	if($scale != 1) {
    	    $resize = imagecreatetruecolor($newWidth, $newHeight);
    	    imagecopyresized($resize, $newImage, 0, 0, 0, 0, $newWidth, $newHeight, 16, 32);
    	    imagedestroy($newImage);
    	    return $resize;
    	}
 
        return $newImage;
    }
 
    // Returns an image handle consisting of an (optionally) scaled combined view of the skin.
    // $r, $g, $b are used to construct the background color.
    function CombinedImage ($scale = 1, $r = 255, $g = 255, $b = 255) {
        $newWidth = 37 * $scale;
        $newHeight = 32 * $scale;
 
        $newImage = imagecreatetruecolor(37, 32);
        $background = imagecolorallocate($newImage, $r, $g, $b);
        imagefilledrectangle($newImage, 0, 0, 37, 32, $background);
 
    	//copy head
    	imagecopy($newImage, $this->image, 4, 0, 8, 8, 8, 8);
    	//copy head mask
    	$this->imagecopyalpha($newImage, $this->image, 4, 0, 40, 8, 8, 8, imagecolorat($this->image, 63, 0));
    	//copy body
    	imagecopy($newImage, $this->image, 4, 8, 20, 20, 8, 12);
    	//copy left leg
    	imagecopy($newImage, $this->image, 8, 20, 4, 20, 4, 12);
    	//copy right leg
    	for($i = 4; $i > 0; $i--) {
    	    imagecopy($newImage, $this->image, 3 + $i, 20, 8 - $i, 20, 1, 12);
    	}
    	//copy right arm
    	for($i = 4; $i > 0; $i--) {
    	    imagecopy($newImage, $this->image, 11 + $i, 8, 48 - $i, 20, 1, 12);
    	}
    	//copy left arm
    	imagecopy($newImage, $this->image, 0, 8, 44, 20, 4, 12);
 
    	//copy head
    	imagecopy($newImage, $this->image, 25, 0, 24, 8, 8, 8);
    	//copy head mask
    	$this->imagecopyalpha($newImage, $this->image, 25, 0, 56, 8, 8, 8, imagecolorat($this->image, 63, 0));
    	//copy body
    	imagecopy($newImage, $this->image, 25, 8, 32, 20, 8, 12);
    	//copy left leg
    	for($i = 4; $i > 0; $i--) {
    	    imagecopy($newImage, $this->image, 28 + $i, 20, 16 - $i, 20, 1, 12);
    	}
    	//copy right leg
    	imagecopy($newImage, $this->image, 25, 20, 12, 20, 4, 12);
    	//copy left arm
    	imagecopy($newImage, $this->image, 33, 8, 52, 20, 4, 12);
    	//copy right arm
    	for($i = 4; $i > 0; $i--) {
    	    imagecopy($newImage, $this->image, 20 + $i, 8, 56 - $i, 20, 1, 12);
    	}
 
        // Scale the image
    	if($scale != 1) {
    	    $resize = imagecreatetruecolor($newWidth, $newHeight);
    	    imagecopyresized($resize, $newImage, 0, 0, 0, 0, $newWidth, $newHeight, 37, 32);
    	    imagedestroy($newImage);
    	    return $resize;
    	}
 
        return $newImage;
    }
 
    // Attempts to compensate for people (incorrectly) filling the head layers with random solid colors
    // Instead of leaving them 100% Alpha.
    function imagecopyalpha($dst, $src, $dst_x, $dst_y, $src_x, $src_y, $w, $h, $bg) {
        for($i = 0; $i < $w; $i++) {
            for($j = 0; $j < $h; $j++) {
 
                $rgb = imagecolorat($src, $src_x + $i, $src_y + $j);
 
                if(($rgb & 0xFFFFFF) == ($bg & 0xFFFFFF)) {
                    $alpha = 127;
                } else {
                    $colors = imagecolorsforindex($src, $rgb);
                    $alpha = $colors["alpha"];
                }
                imagecopymerge($dst, $src, $dst_x + $i, $dst_y + $j, $src_x + $i, $src_y + $j, 1, 1, 100 - (($alpha / 127) * 100));
            }
        }
    }
}
?>