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gms8994 on 12/04/09

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Last Edited at 12/04/09 02:17pm

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imagecreatefrombmp

/ Published in: PHP
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Since PHP doesn't have a builtin imagecreatefrombmp, this allows users to upload bmp files and you can handle them and create a different image type from it.

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  1. /**
  2.  * Creates function imagecreatefrombmp, since PHP doesn't have one
  3.  * @return resource An image identifier, similar to imagecreatefrompng
  4.  * @param string $filename Path to the BMP image
  5.  * @see imagecreatefrompng
  6.  * @author Glen Solsberry <[email protected]>
  7.  */
  8. if (!function_exists("imagecreatefrombmp")) {
  9. 	function imagecreatefrombmp( $filename ) {
  10. 		$file = fopen( $filename, "rb" );
  11. 		$read = fread( $file, 10 );
  12. 		while( !feof( $file ) && $read != "" )
  13. 		{
  14. 			$read .= fread( $file, 1024 );
  15. 		}
  16. 		$temp = unpack( "H*", $read );
  17. 		$hex = $temp[1];
  18. 		$header = substr( $hex, 0, 104 );
  19. 		$body = str_split( substr( $hex, 108 ), 6 );
  20. 		if( substr( $header, 0, 4 ) == "424d" )
  21. 		{
  22. 			$header = substr( $header, 4 );
  23. 			// Remove some stuff?
  24. 			$header = substr( $header, 32 );
  25. 			// Get the width
  26. 			$width = hexdec( substr( $header, 0, 2 ) );
  27. 			// Remove some stuff?
  28. 			$header = substr( $header, 8 );
  29. 			// Get the height
  30. 			$height = hexdec( substr( $header, 0, 2 ) );
  31. 			unset( $header );
  32. 		}
  33. 		$x = 0;
  34. 		$y = 1;
  35. 		$image = imagecreatetruecolor( $width, $height );
  36. 		foreach( $body as $rgb )
  37. 		{
  38. 			$r = hexdec( substr( $rgb, 4, 2 ) );
  39. 			$g = hexdec( substr( $rgb, 2, 2 ) );
  40. 			$b = hexdec( substr( $rgb, 0, 2 ) );
  41. 			$color = imagecolorallocate( $image, $r, $g, $b );
  42. 			imagesetpixel( $image, $x, $height-$y, $color );
  43. 			$x++;
  44. 			if( $x >= $width )
  45. 			{
  46. 				$x = 0;
  47. 				$y++;
  48. 			}
  49. 		}
  50. 		return $image;
  51. 	}
  52. }

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