imagecreatefromwbmp

(PHP 4 >= 4.0.1, PHP 5)

imagecreatefromwbmp — Create a new image from file or URL

설명

resource imagecreatefromwbmp ( string $filename )

imagecreatefromwbmp() returns an image identifier representing the image obtained from the given filename.

imagecreatefromwbmp() returns an empty string on failure. It also outputs an error message, which unfortunately displays as a broken link in a browser. To ease debugging the following example will produce an error WBMP:

Example#1 Example to handle an error during creation


<?php
function LoadWBMP($imgname)
{
    $im = @imagecreatefromwbmp($imgname); /* Attempt to open */
    if (!$im) { /* See if it failed */
        $im  = imagecreatetruecolor (20, 20); /* Create a blank image */
        $bgc = imagecolorallocate($im, 255, 255, 255);
        $tc  = imagecolorallocate($im, 0, 0, 0);
        imagefilledrectangle($im, 0, 0, 10, 10, $bgc);
        /* Output an errmsg */
        imagestring($im, 1, 5, 5, "Error loading $imgname", $tc);
    }
    return $im;
}
?>

Tip

fopen 래퍼를 활성화하면, 이 함수의 파일명으로 URL을 사용할 수 있습니다. 파일 이름을 지정하는 방법은 fopen()을, 지원하는 URL 프로토콜 목록은 지원 프로토콜/래퍼 목록를 참고하십시오.

매개변수

filename: Path to the WBMP image

반환값

Returns an image resource identifier on success, FALSE on errors.

주의

Note: WBMP 지원은 PHP를 GD-1.8 이상에서 컴파일해야 합니다.

Warning

PHP 4.3.0 이후의 Windows 버전 PHP에서는 이 함수를 이용하여 원격 파일에 접근할 수 없습니다. allow_url_fopen을 활성화하여도 마찬가지입니다.

imagecreatefromxbm

imagecreatefromstring

Last updated: Sun, 25 Nov 2007

add a note User Contributed Notes
imagecreatefromwbmp

alexander at alexauto dot nl
08-Oct-2008 04:59


AeroX created a nice example, but it only works at specific imagesizes because bmp uses fully 32-bit lines. To prevent failures (different colors, pixel-shifting per line), the solution is to skip the padding, inserted after color-pixels on the line. His implementation did cutting the padding into the image-data, causing wrong colors, pixel-shifting per line and also an large memory-consumption.





I improved this script to the next implementation. The readability of a image is checked by a other function, so it doesn't take part in this script.


Suggestions? Please let me know.





<?php


    public 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


        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;


    }


?>

d at bwdp dot org
14-Aug-2008 04:07


why has php not made a predefined function like imagecreatefrombmp yet? surely there's more demand for it than there is for the wbmp function

AeroX @ aerox-studios
11-May-2008 02:54


.bmp is just hex encoded RGB values.

All you need to do is open in binary mode and seperate the header from the body.

Decode the width and height from the header.

Then create the image pixel by pixel from the RGB values in the body.



function imagecreatefrombmp( $filename )

{

    $file = fopen( $filename, "rb" );

    $read = fread( $file, 10 );

    while( !feof( $file ) && $read != "" )

    {

        $read .= fread( $file, 1024 );

    }

    $temp = unpack( "H*", $read );

    $hex = $temp[1];

    $header = substr( $hex, 0, 104 );

    $body = str_split( substr( $hex, 108 ), 6 );

    if( substr( $header, 0, 4 ) == "424d" )

    {

        $header = substr( $header, 4 );

        // Remove some stuff?

        $header = substr( $header, 32 );

        // Get the width

        $width = hexdec( substr( $header, 0, 2 ) );

        // Remove some stuff?

        $header = substr( $header, 8 );

        // Get the height

        $height = hexdec( substr( $header, 0, 2 ) );

        unset( $header );

    }

    $x = 0;

    $y = 1;

    $image = imagecreatetruecolor( $width, $height );

    foreach( $body as $rgb )

    {

        $r = hexdec( substr( $rgb, 4, 2 ) );

        $g = hexdec( substr( $rgb, 2, 2 ) );

        $b = hexdec( substr( $rgb, 0, 2 ) );

        $color = imagecolorallocate( $image, $r, $g, $b );

        imagesetpixel( $image, $x, $height-$y, $color );

        $x++;

        if( $x >= $width )

        {

            $x = 0;

            $y++;

        }

    }

    return $image;

}

nko38 dot fr at gmail dot com
02-Nov-2005 05:20


for .bmp files, convert them with bmp2png, then you can use this files in gd





http://cetus.sakura.ne.jp/softlab/b2p-home/

clambert at whitecrown dot net
16-Jun-2001 01:47


WBMP images are Wireless Bitmaps, not Windows Bitmaps. WBMP is used for bandwidth constrained, black and white, limited devices such as PDAs and Cell Phones.

add a note

imagecreatefromxbm

imagecreatefromstring

Last updated: Sun, 25 Nov 2007