Drawing.php

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<?php
 
namespace PhpOffice\PhpSpreadsheet\Shared;
 
use GdImage;
 
class Drawing
{
    public static function pixelsToEMU($pValue)
    {
        return $pValue * 9525;
    }
 
    public static function EMUToPixels($pValue)
    {
        if ($pValue != 0) {
            return (int) round($pValue / 9525);
        }
 
        return 0;
    }
 
    public static function pixelsToCellDimension($pValue, \PhpOffice\PhpSpreadsheet\Style\Font $pDefaultFont)
    {
        // Font name and size
        $name = $pDefaultFont->getName();
        $size = $pDefaultFont->getSize();
 
        if (isset(Font::$defaultColumnWidths[$name][$size])) {
            // Exact width can be determined
            $colWidth = $pValue * Font::$defaultColumnWidths[$name][$size]['width'] / Font::$defaultColumnWidths[$name][$size]['px'];
        } else {
            // We don't have data for this particular font and size, use approximation by
            // extrapolating from Calibri 11
            $colWidth = $pValue * 11 * Font::$defaultColumnWidths['Calibri'][11]['width'] / Font::$defaultColumnWidths['Calibri'][11]['px'] / $size;
        }
 
        return $colWidth;
    }
 
    public static function cellDimensionToPixels($pValue, \PhpOffice\PhpSpreadsheet\Style\Font $pDefaultFont)
    {
        // Font name and size
        $name = $pDefaultFont->getName();
        $size = $pDefaultFont->getSize();
 
        if (isset(Font::$defaultColumnWidths[$name][$size])) {
            // Exact width can be determined
            $colWidth = $pValue * Font::$defaultColumnWidths[$name][$size]['px'] / Font::$defaultColumnWidths[$name][$size]['width'];
        } else {
            // We don't have data for this particular font and size, use approximation by
            // extrapolating from Calibri 11
            $colWidth = $pValue * $size * Font::$defaultColumnWidths['Calibri'][11]['px'] / Font::$defaultColumnWidths['Calibri'][11]['width'] / 11;
        }
 
        // Round pixels to closest integer
        $colWidth = (int) round($colWidth);
 
        return $colWidth;
    }
 
    public static function pixelsToPoints($pValue)
    {
        return $pValue * 0.75;
    }
 
    public static function pointsToPixels($pValue)
    {
        if ($pValue != 0) {
            return (int) ceil($pValue / 0.75);
        }
 
        return 0;
    }
 
    public static function degreesToAngle($pValue)
    {
        return (int) round($pValue * 60000);
    }
 
    public static function angleToDegrees($pValue)
    {
        if ($pValue != 0) {
            return (int) round($pValue / 60000);
        }
 
        return 0;
    }
 
    public static function imagecreatefrombmp($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);
 
        //    Process the header
        //    Structure: http://www.fastgraph.com/help/bmp_header_format.html
        $width = 0;
        $height = 0;
        if (substr($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;
    }
}