sprites/C16File.php

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<?php
require_once(dirname(__FILE__).'/../support/IReader.php');
require_once(dirname(__FILE__).'/SpriteFile.php');
require_once(dirname(__FILE__).'/C16Frame.php');

class C16File extends SpriteFile
{
    
    private $encoding;


    public function C16File(IReader $reader=null)
    {
        if($reader != null) {
            parent::SpriteFile('C16');
            $buffer = $reader->ReadInt(4);
            if(($buffer & 1) == 1) {
                $this->encoding = '565';
            } else {
                $this->encoding = '555';
            }

            if(($buffer & 2) == 0) { //buffer & 2 == 2 => RLE. buffer & 2 == 0 => non-RLE (same as s16 but not supported here because it's complex dude.
                throw new Exception('This file is probably a S16 masquerading as a C16!');
            } else if($buffer > 3) {
                throw new Exception('File encoding not recognised. ('.$buffer.')');
            }

            $buffer = $reader->ReadInt(2);
            if($buffer < 1)
                throw new Exception('Sprite file appears to contain less than 1 frame.');
            $frameCount = $buffer;
            for($x=0; $x < $frameCount; $x++)
            {
                $this->AddFrame(new C16Frame($reader,$this->encoding));
            }
        }
    }

    public function SetEncoding($encoding) {
        $this->EnsureDecompiled();
        $this->encoding = $encoding;
    }

    public function Compile() {
        $data = ''; 
        $flags = 2; // 0b00 => 555 S16, 0b01 => 565 S16, 0b10 => 555 C16, 0b11 => 565 C16
        if($this->encoding == '565') {
            $flags = $flags | 1;
        }
        $data .= pack('V',$flags);
        $data .= pack('v',$this->GetFrameCount());
        $idata = '';
        $offset = 6+(8*$this->GetFrameCount());
        foreach($this->GetFrames() as $frame) {
            $offset += ($frame->GetHeight()-1)*4;
        }

        foreach($this->GetFrames() as $frame) {
            $data .= pack('V',$offset);
            $data .= pack('vv',$frame->GetWidth(),$frame->GetHeight());

            $framedata = $frame->Encode();
            $framebin = $framedata['data'];
            foreach($framedata['lineoffsets'] as $lineoffset) {
                $data .= pack('V',$lineoffset+$offset);
            }
            $offset += strlen($framebin); 
            $idata .= $framebin;
        }
        return $data . $idata;
    }

}
?>