sprites/S16Frame.php

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<?php
require_once(dirname(__FILE__).'/SpriteFrame.php');
require_once(dirname(__FILE__).'/../support/IReader.php');


class S16Frame extends SpriteFrame {


    private $offset;
    private $reader;
    private $decoded;
    private $encoding;

    
    
    public function S16Frame($reader,$encoding='565',$width=false,$height=false,$offset=false)
    {
        if($reader instanceof IReader) {
            $this->reader = $reader;
            $this->encoding = $encoding;
            if($width === false || $height === false || $offset === false) {
                $this->offset = $this->reader->ReadInt(4);
                parent::SpriteFrame($this->reader->ReadInt(2), $this->reader->ReadInt(2));
            } else {
                parent::SpriteFrame($width,$height);
                $this->offset = $offset;
            }
        } else if(get_resource_type($reader) == 'gd') {
            $this->gdImage = $reader;
            $this->decoded = true;
            $this->encoding = $encoding;
            parent::SpriteFrame(imagesx($reader), imagesy($reader));

        }
    }


    public function Encode($format='565') {
        $this->EnsureDecoded();
        $data = ''; 
        for($y = 0; $y < $this->GetHeight(); $y++) {
            for($x = 0; $x < $this->GetWidth(); $x++ ) {

                $pixel = $this->GetPixel($x,$y);
                if($pixel['red'] > 255 || $pixel['green'] > 255 || $pixel['blue'] > 255) {
                    throw new Exception('Pixel colour out of range.');
                }
                $newpixel = 0;
                if($this->encoding == '555') {
                    $newpixel = (($pixel['red'] << 7) & 0xF800) | (($pixel['green'] << 2) & 0x03E0) | (($pixel['blue'] >> 3) & 0x001F);
                } else {
                    $newpixel = (($pixel['red'] << 8) & 0xF800) | (($pixel['green'] << 3) & 0x07E0) | (($pixel['blue'] >> 3) & 0x001F);
                }
                $data .= pack('v',$newpixel);
            }
        }
        return $data;
    }

    
    // @brief Decodes the S16Frame and creates a gdimage.
    protected function Decode() {
        if($this->decoded) { return $this->gdImage; }

            $image = imagecreatetruecolor($this->GetWidth(),
                $this->GetHeight());
        $this->reader->Seek($this->offset);
        for($y = 0; $y < $this->GetHeight(); $y++)
        {
            for($x = 0; $x < $this->GetWidth(); $x++)
            {
                $pixel = $this->reader->ReadInt(2);
                $red = 0; $green = 0; $blue = 0;
                if($this->encoding == "565")
                {
                    $red   = ($pixel & 0xF800) >> 8;
                    $green = ($pixel & 0x07E0) >> 3;
                    $blue  = ($pixel & 0x001F) << 3;
                }
                else if($this->encoding == "555")
                {
                    $red   = ($pixel & 0x7C00) >> 7;
                    $green = ($pixel & 0x03E0) >> 2;
                    $blue  = ($pixel & 0x001F) << 3;
                }
                $colour = imagecolorallocate($image, $red, $green, $blue);
                imagesetpixel($image, $x, $y, $colour);
            }
        }
        $this->gdImage = $image;
        $this->decoded = true;
        return $image;
    }
}
?>