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<?php |
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/** |
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* Image |
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* |
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* @Author: Jens Kooij |
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* @Version: 1.0 |
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* @package: JNS MVC |
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* @Licence: http://creativecommons.org/licenses/by-nc-nd/3.0/ Attribution-NonCommercial-NoDerivs 3.0 Unported |
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*/ |
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namespace library\images |
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{ |
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class Image |
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{ |
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private $_imageResource; |
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/** |
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* Load the a image resource into $this->_imageResource |
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* automagically :-) |
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* |
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* @param resource | string | path |
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* @throws \Exception |
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*/ |
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public function LoadImage($imageContainer) |
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{ |
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if (is_resource($imageContainer) && get_resource_type($imageContainer) === 'gd') { |
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$this->_imageResource = $imageContainer; |
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} elseif (is_string($imageContainer) && file_exists($imageContainer)) { |
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if ($this->GetImageMimeType($imageContainer) == IMAGETYPE_BMP) { |
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$this->_imageResource = $this->CreateImageFromBmp($imageContainer); |
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} else { |
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$imageContent = file_get_contents($imageContainer); |
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$this->_imageResource = imagecreatefromstring($imageContent); |
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} |
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} elseif(is_string($imageContainer)) { |
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$this->_imageResource = imagecreatefromstring($imageContainer); |
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} else { |
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throw new \Exception('Could not create image resource, accepted inputs are: "resource of type (gd)", path_to_image and "string". <br /><pre>' . var_export($imageContainer, true) . '</pre>'); |
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} |
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} |
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/** |
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* Saves the image to a file |
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* |
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* @param string $path |
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* @param int $mimeTypeConstantValue |
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* @param int $quality |
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* @param null $imageResource If no resource is given, uses $this->_imageResource |
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* @return bool |
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* @throws \Exception |
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*/ |
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public function SaveImage($path, $mimeTypeConstantValue, $quality = 100, $imageResource = null) |
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{ |
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if ($imageResource == null) { |
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$imageResource = $this->GetImageResource(); |
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} |
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if ($mimeTypeConstantValue == IMAGETYPE_GIF) { |
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return imagegif($imageResource, $path); |
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} elseif ($mimeTypeConstantValue == IMAGETYPE_JPEG) { |
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return imagejpeg($imageResource, $path, $quality); |
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} elseif ($mimeTypeConstantValue == IMAGETYPE_PNG) { |
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return imagepng($imageResource, $path, (intval($quality / 10) -1)); |
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} |
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else { |
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throw new \Exception('Not a valid mimetypeconstant given see function documentation'); |
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} |
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} |
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/** |
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* Returns either the Mime-Type Constant value |
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* or the default extension for the detected mime-type; |
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* |
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* @see http://www.php.net/manual/en/function.image-type-to-mime-type.php |
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* @param string $imagePath |
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* @param bool $getExtension |
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* @return bool|int|string |
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*/ |
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public function GetImageMimeType($imagePath, $getExtension = false) |
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{ |
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if (function_exists('exif_imagetype')) { |
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$exif = exif_imagetype($imagePath); |
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} else { |
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if ((list($width, $height, $type, $attr) = getimagesize($imagePath)) !== false ) { |
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$exif = $type; |
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} else { |
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$exif = false; |
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} |
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} |
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return $getExtension ? image_type_to_extension($exif) : $exif; |
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} |
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/** |
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* Create Image resource from Bitmap |
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* |
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* @see http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214 |
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* @author alexander at alexauto dot nl |
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* @param string $p_sFile |
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* @return resource |
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*/ |
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public function CreateImageFromBmp($p_sFile) |
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{ |
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// Load the image into a string |
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$file = fopen($p_sFile,"rb"); |
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$read = fread($file,10); |
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while(!feof($file)&&($read<>"")) |
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$read .= fread($file,1024); |
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$temp = unpack("H*",$read); |
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$hex = $temp[1]; |
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$header = substr($hex,0,108); |
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$width=null; |
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$height=null; |
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// Process the header |
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// Structure: http://www.fastgraph.com/help/bmp_header_format.html |
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if (substr($header,0,4)=="424d") |
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{ |
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// Cut it in parts of 2 bytes |
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$header_parts = str_split($header,2); |
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// Get the width 4 bytes |
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$width = hexdec($header_parts[19].$header_parts[18]); |
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// Get the height 4 bytes |
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$height = hexdec($header_parts[23].$header_parts[22]); |
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// Unset the header params |
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unset($header_parts); |
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} |
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// Define starting X and Y |
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$x = 0; |
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$y = 1; |
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// Create newimage |
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$image = imagecreatetruecolor($width,$height); |
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// Grab the body from the image |
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$body = substr($hex,108); |
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// Calculate if padding at the end-line is needed |
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// Divided by two to keep overview. |
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// 1 byte = 2 HEX-chars |
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$body_size = (strlen($body)/2); |
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$header_size = ($width*$height); |
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// Use end-line padding? Only when needed |
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$usePadding = ($body_size>($header_size*3)+4); |
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// Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption |
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// Calculate the next DWORD-position in the body |
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for ($i=0;$i<$body_size;$i+=3) |
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{ |
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// Calculate line-ending and padding |
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if ($x>=$width) |
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{ |
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// If padding needed, ignore image-padding |
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// Shift i to the ending of the current 32-bit-block |
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if ($usePadding) |
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$i += $width%4; |
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// Reset horizontal position |
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$x = 0; |
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// Raise the height-position (bottom-up) |
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$y++; |
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// Reached the image-height? Break the for-loop |
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if ($y>$height) |
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break; |
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} |
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// Calculation of the RGB-pixel (defined as BGR in image-data) |
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// Define $i_pos as absolute position in the body |
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$i_pos = $i*2; |
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$r = hexdec($body[$i_pos+4].$body[$i_pos+5]); |
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$g = hexdec($body[$i_pos+2].$body[$i_pos+3]); |
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$b = hexdec($body[$i_pos].$body[$i_pos+1]); |
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// Calculate and draw the pixel |
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$color = imagecolorallocate($image,$r,$g,$b); |
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imagesetpixel($image,$x,$height-$y,$color); |
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// Raise the horizontal position |
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$x++; |
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} |
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// Unset the body / free the memory |
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unset($body); |
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// Return image-object |
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return $image; |
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} |
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/** |
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* Returns the image resource |
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* @return resource |
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* @throws \Exception |
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*/ |
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final public function GetImageResource() |
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{ |
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if (is_resource($this->_imageResource) && get_resource_type($this->_imageResource) === 'gd') { |
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return $this->_imageResource; |
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} else { |
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throw new \Exception('Image resource is not set. Use $this->LoadImage to load an image into the resource'); |
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} |
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} |
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} |
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} |
jenskooij /
cloudcontrol
