Posprint\Graphics\Graphics::loadBMP()

Complexity

Conditions	8
Paths	8

Size

Total Lines	78
Code Lines	40

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	43
CRAP Score	8.0007

Importance

Changes	1
Bugs	0	Features	0

<?php
    public function loadBMP($filename)
    {
        //Load the image into a string
        $file = fopen($filename, "rb");
        $read = fread($file, 10);
        //continue at the end of file
        while (! feof($file) && ($read <> "")) {
            $read .= fread($file, 1024);
        }
        fclose($file);
        $temp = unpack("H*", $read);
        $hex = $temp[1];
        $header = substr($hex, 0, 108);
        //Process the header
        //Structure: http://www.fastgraph.com/help/bmp_header_format.html
        if (substr($header, 0, 4) != "424d") {
            //is not a BMP file
            return false;
        }
        //Cut it in parts of 2 bytes
        $headerParts = str_split($header, 2);
        //Get the width 4 bytes
        $width = hexdec($headerParts[19].$headerParts[18]);
        //Get the height 4 bytes
        $height = hexdec($headerParts[23].$headerParts[22]);
        // Unset the header params
        unset($headerParts);
        // Define starting X and Y
        $xPos = 0;
        $yPos = 1;
        //Create new gd image
        $image = imagecreatetruecolor($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
        $bodySize = (strlen($body) / 2);
        $headerSize = ($width * $height);
        //Use end-line padding? Only when needed
        $usePadding = ($bodySize > ($headerSize * 3) + 4);
        //Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
        //Calculate the next DWORD-position in the body
        for ($iCount = 0; $iCount < $bodySize; $iCount += 3) {
            //Calculate line-ending and padding
            if ($xPos >= $width) {
                //If padding needed, ignore image-padding
                //Shift i to the ending of the current 32-bit-block
                if ($usePadding) {
                    $iCount += $width % 4;
                }
                //Reset horizontal position
                $xPos = 0;
                //Raise the height-position (bottom-up)
                $yPos++;
                //Reached the image-height? Break the for-loop
                if ($yPos > $height) {
                    break;
                }
            }
            //Calculation of the RGB-pixel (defined as BGR in image-data)
            //Define $i_pos as absolute position in the body
            $iPos = $iCount * 2;
            $red = hexdec($body[$iPos + 4] . $body[$iPos + 5]);
            $green = hexdec($body[$iPos + 2] . $body[$iPos + 3]);
            $blue = hexdec($body[$iPos] . $body[$iPos + 1]);
            //Calculate and draw the pixel
            $color = imagecolorallocate($image, $red, $green, $blue);
            imagesetpixel($image, $xPos, $height-$yPos, $color);
            //Raise the horizontal position
            $xPos++;
        }
        //Unset the body / free the memory
        unset($body);
        //Return GD image-object
        $this->img = $image;
        return $image;
    }