library\images\Image::CreateImageFromBmp()

Complexity

Conditions	8
Paths	12

Size

Total Lines	94
Code Lines	39

Duplication

Lines	0
Ratio	0 %

Importance

Changes	4
Bugs	0	Features	1

<?php
		public function CreateImageFromBmp($p_sFile)
		{
			//    Load the image into a string 
			$file    =    fopen($p_sFile,"rb"); 
			$read    =    fread($file,10); 
			while(!feof($file)&&($read<>"")) 
				$read    .=    fread($file,1024); 
			
			$temp    =    unpack("H*",$read); 
			$hex    =    $temp[1]; 
			$header    =    substr($hex,0,108);
			$width=null;
			$height=null;
			
			//    Process the header 
			//    Structure: http://www.fastgraph.com/help/bmp_header_format.html 
			if (substr($header,0,4)=="424d") 
			{ 
				//    Cut it in parts of 2 bytes 
				$header_parts    =    str_split($header,2); 
				
				//    Get the width        4 bytes 
				$width            =    hexdec($header_parts[19].$header_parts[18]); 
				
				//    Get the height        4 bytes 
				$height            =    hexdec($header_parts[23].$header_parts[22]); 
				
				//    Unset the header params 
				unset($header_parts); 
			} 
			
			//    Define starting X and Y 
			$x                =    0; 
			$y                =    1; 
			
			//    Create newimage 
			$image            =    imagecreatetruecolor($width,$height); 
			
			//    Grab the body from the image 
			$body            =    substr($hex,108); 

			//    Calculate if padding at the end-line is needed 
			//    Divided by two to keep overview. 
			//    1 byte = 2 HEX-chars 
			$body_size        =    (strlen($body)/2); 
			$header_size    =    ($width*$height); 

			//    Use end-line padding? Only when needed 
			$usePadding        =    ($body_size>($header_size*3)+4); 
			
			//    Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption 
			//    Calculate the next DWORD-position in the body 
			for ($i=0;$i<$body_size;$i+=3) 
			{ 
				//    Calculate line-ending and padding 
				if ($x>=$width) 
				{ 
					//    If padding needed, ignore image-padding 
					//    Shift i to the ending of the current 32-bit-block 
					if ($usePadding) 
						$i    +=    $width%4; 
					
					//    Reset horizontal position 
					$x    =    0; 
					
					//    Raise the height-position (bottom-up) 
					$y++; 
					
					//    Reached the image-height? Break the for-loop 
					if ($y>$height) 
						break; 
				} 
				
				//    Calculation of the RGB-pixel (defined as BGR in image-data) 
				//    Define $i_pos as absolute position in the body 
				$i_pos    =    $i*2; 
				$r        =    hexdec($body[$i_pos+4].$body[$i_pos+5]); 
				$g        =    hexdec($body[$i_pos+2].$body[$i_pos+3]); 
				$b        =    hexdec($body[$i_pos].$body[$i_pos+1]); 
				
				//    Calculate and draw the pixel 
				$color    =    imagecolorallocate($image,$r,$g,$b); 
				imagesetpixel($image,$x,$height-$y,$color); 
				
				//    Raise the horizontal position 
				$x++; 
			} 
			
			//    Unset the body / free the memory 
			unset($body); 
			
			//    Return image-object 
			return $image;
		}

}