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SimpleImage.class.php
<?php /* The PHP SimpleImage class - v2 By Cory LaViska for A Beautiful Site, LLC. (http://www.abeautifulsite.net/) License: This software is dual-licensed under the GNU General Public License and the MIT License and is copyright A Beautiful Site, LLC. */ class SimpleImage { private $image, $filename, $original_info, $width, $height; function __construct($filename = null) { if( $filename ) $this->load($filename); } function __destruct() { if( $this->image ) imagedestroy($this->image); } // // Load an image // // $filename - the image to be loaded (required) // public function load($filename) { // Require GD library if( !extension_loaded('gd') ) throw new Exception('Required extension GD is not loaded.'); $this->filename = $filename; $info = getimagesize($this->filename); switch( $info['mime'] ) { case 'image/gif': $this->image = imagecreatefromgif($this->filename); break; case 'image/jpeg': $this->image = imagecreatefromjpeg($this->filename); break; case 'image/png': $this->image = imagecreatefrompng($this->filename); break; default: throw new Exception('Invalid image: ' . $this->filename); break; } $this->original_info = array( 'width' => $info[0], 'height' => $info[1], 'orientation' => $this->get_orientation(), 'exif' => function_exists('exif_read_data') ? $this->exif = @exif_read_data($this->filename) : null, 'format' => preg_replace('/^image\//', '', $info['mime']), 'mime' => $info['mime'] ); $this->width = $info[0]; $this->height = $info[1]; imagesavealpha($this->image, true); imagealphablending($this->image, true); return $this; } // // Save an image // // $filename - the filename to save to (defaults to original file) // $quality - 0-9 for PNG, 0-100 for JPEG // // Notes: // // The resulting format will be determined by the file extension. // public function save($filename = null, $quality = null) { if( !$filename ) $filename = $this->filename; // Determine format via file extension (fall back to original format) $format = $this->file_ext($filename); if( !$format ) $format = $this->original_info['format']; // Determine output format switch( $format ) { case 'gif': $result = imagegif($this->image, $filename); break; case 'jpg': case 'jpeg': if( $quality === null ) $quality = 85; $quality = $this->keep_within($quality, 0, 100); $result = imagejpeg($this->image, $filename, $quality); break; case 'png': if( $quality === null ) $quality = 9; $quality = $this->keep_within($quality, 0, 9); $result = imagepng($this->image, $filename, $quality); break; default: throw new Exception('Unsupported format'); } if( !$result ) throw new Exception('Unable to save image: ' . $filename); return $this; } // // Get info about the original image // // Returns // // array( // width => 320, // height => 200, // orientation => ['portrait', 'landscape', 'square'], // exif => array(...), // mime => ['image/jpeg', 'image/gif', 'image/png'], // format => ['jpeg', 'gif', 'png'] // ) // public function get_original_info() { return $this->original_info; } // // Get the current width // public function get_width() { return imagesx($this->image); } // // Get the current height // public function get_height() { return imagesy($this->image); } // // Get the current orientation ('portrait', 'landscape', or 'square') // public function get_orientation() { if( imagesx($this->image) > imagesy($this->image) ) return 'landscape'; if( imagesx($this->image) < imagesy($this->image) ) return 'portrait'; return 'square'; } // // Flip an image horizontally or vertically // // $direction - 'x' or 'y' // public function flip($direction) { $new = imagecreatetruecolor($this->width, $this->height); imagealphablending($new, false); imagesavealpha($new, true); switch( strtolower($direction) ) { case 'y': for( $y = 0; $y < $this->height; $y++ ) imagecopy($new, $this->image, 0, $y, 0, $this->height - $y - 1, $this->width, 1); break; default: for( $x = 0; $x < $this->width; $x++ ) imagecopy($new, $this->image, $x, 0, $this->width - $x - 1, 0, 1, $this->height); break; } $this->image = $new; return $this; } // // Rotate an image // // $angle - 0 - 360 (required) // $bg_color - hex color for the background // public function rotate($angle, $bg_color = '#000000') { $rgb = $this->hex2rgb($bg_color); $bg_color = imagecolorallocate($this->image, $rgb['r'], $rgb['g'], $rgb['b']); $new = imagerotate($this->image, -($this->keep_within($angle, -360, 360)), $bg_color); imagesavealpha($new, true); imagealphablending($new, true); $this->width = imagesx($new); $this->height = imagesy($new); $this->image = $new; return $this; } // // Rotates and/or flips an image automatically so the orientation will // be correct (based on exif 'Orientation') // public function auto_orient() { // Adjust orientation switch( $this->original_info['exif']['Orientation'] ) { case 1: // Do nothing break; case 2: // Flip horizontal $this->flip('x'); break; case 3: // Rotate 180 counterclockwise $this->rotate(-180); break; case 4: // vertical flip $this->flip('y'); break; case 5: // Rotate 90 clockwise and flip vertically $this->flip('y'); $this->rotate(90); break; case 6: // Rotate 90 clockwise $this->rotate(90); break; case 7: // Rotate 90 clockwise and flip horizontally $this->flip('x'); $this->rotate(90); break; case 8: // Rotate 90 counterclockwise $this->rotate(-90); break; } return $this; } // // Resize an image to the specified dimensions // // $width - the width of the resulting image // $height - the height of the resulting image // public function resize($width, $height) { $new = imagecreatetruecolor($width, $height); imagealphablending($new, false); imagesavealpha($new, true); imagecopyresampled($new, $this->image, 0, 0, 0, 0, $width, $height, $this->width, $this->height); $this->width = $width; $this->height = $height; $this->image = $new; return $this; } // // Fit to width (proportionally resize to specified width) // public function fit_to_width($width) { $aspect_ratio = $this->height / $this->width; $height = $width * $aspect_ratio; return $this->resize($width, $height); } // // Fit to height (proportionally resize to specified height) // public function fit_to_height($height) { $aspect_ratio = $this->height / $this->width; $width = $height / $aspect_ratio; return $this->resize($width, $height); } // // Best fit (proportionally resize to fit in specified width/height) // public function best_fit($max_width, $max_height) { // If it already fits, there's nothing to do if( $this->width <= $max_width && $this->height <= $max_height ) return $this; // Determine aspect ratio $aspect_ratio = $this->height / $this->width; // Make width fit into new dimensions if( $this->width > $max_width ) { $width = $max_width; $height = $width * $aspect_ratio; } else { $width = $this->width; $height = $this->height; } // Make height fit into new dimensions if( $height > $max_height ) { $height = $max_height; $width = $height / $aspect_ratio; } return $this->resize($width, $height); } // // Crop an image // // $x1 - left // $y1 - top // $x2 - right // $y2 - bottom // public function crop($x1, $y1, $x2, $y2) { // Determine crop size if( $x2 < $x1 ) list($x1, $x2) = array($x2, $x1); if( $y2 < $y1 ) list($y1, $y2) = array($y2, $y1); $crop_width = $x2 - $x1; $crop_height = $y2 - $y1; $new = imagecreatetruecolor($crop_width, $crop_height); imagealphablending($new, false); imagesavealpha($new, true); imagecopyresampled($new, $this->image, 0, 0, $x1, $y1, $crop_width, $crop_height, $crop_width, $crop_height); $this->width = $crop_width; $this->height = $crop_height; $this->image = $new; return $this; } // // Square crop (great for thumbnails) // // $size - the size in pixels of the resulting image (width and height are the same) (optional) // public function square_crop($size = null) { // Calculate measurements if( $this->width > $this->height ) { // Landscape $x_offset = ($this->width - $this->height) / 2; $y_offset = 0; $square_size = $this->width - ($x_offset * 2); } else { // Portrait $x_offset = 0; $y_offset = ($this->height - $this->width) / 2; $square_size = $this->height - ($y_offset * 2); } // Trim to square $this->crop($x_offset, $y_offset, $x_offset + $square_size, $y_offset + $square_size); // Resize if( $size ) $this->resize($size, $size); return $this; } // // Desaturate (grayscale) // public function desaturate() { imagefilter($this->image, IMG_FILTER_GRAYSCALE); return $this; } // // Invert // public function invert() { imagefilter($this->image, IMG_FILTER_NEGATE); return $this; } // // Brightness // // $level - darkest = -255, lightest = 255 (required) // public function brightness($level) { imagefilter($this->image, IMG_FILTER_BRIGHTNESS, $this->keep_within($level, -255, 255)); return $this; } // // Contrast // // $level - min = -100, max, 100 (required) // public function contrast($level) { imagefilter($this->image, IMG_FILTER_CONTRAST, $this->keep_within($level, -100, 100)); return $this; } // // Colorize (requires PHP 5.2.5+) // // $color - any valid hex color (required) // $opacity - 0 - 1 (required) // public function colorize($color, $opacity) { $rgb = $this->hex2rgb($color); $alpha = $this->keep_within(127 - (127 * $opacity), 0, 127); imagefilter($this->image, IMG_FILTER_COLORIZE, $this->keep_within($rgb['r'], 0, 255), $this->keep_within($rgb['g'], 0, 255), $this->keep_within($rgb['b'], 0, 255), $alpha); return $this; } // // Edge Detect // public function edges() { imagefilter($this->image, IMG_FILTER_EDGEDETECT); return $this; } // // Emboss // public function emboss() { imagefilter($this->image, IMG_FILTER_EMBOSS); return $this; } // // Mean Remove // public function mean_remove() { imagefilter($this->image, IMG_FILTER_MEAN_REMOVAL); return $this; } // // Blur // // $type - 'selective' or 'gaussian' (default = selective) // $passes - the number of times to apply the filter // public function blur($type = 'selective', $passes = 1) { switch( strtolower($type) ) { case 'gaussian': $type = IMG_FILTER_GAUSSIAN_BLUR; break; default: $type = IMG_FILTER_SELECTIVE_BLUR; break; } for( $i = 0; $i < $passes; $i++ ) imagefilter($this->image, $type); return $this; } // // Sketch // public function sketch() { imagefilter($this->image, IMG_FILTER_MEAN_REMOVAL); return $this; } // // Smooth // // $level - min = -10, max = 10 // public function smooth($level) { imagefilter($this->image, IMG_FILTER_SMOOTH, $this->keep_within($level, -10, 10)); return $this; } // // Pixelate (requires PHP 5.3+) // // $block_size - the size in pixels of each resulting block (default = 10) // public function pixelate($block_size = 10) { imagefilter($this->image, IMG_FILTER_PIXELATE, $block_size, true); return $this; } // // Sepia // public function sepia() { imagefilter($this->image, IMG_FILTER_GRAYSCALE); imagefilter($this->image, IMG_FILTER_COLORIZE, 100, 50, 0); return $this; } // // Overlay (overlay an image on top of another; works with 24-big PNG alpha-transparency) // // $overlay_file - the image to use as a overlay (required) // $position - 'center', 'top', 'left', 'bottom', 'right', 'top left', // 'top right', 'bottom left', 'bottom right' // $opacity - overlay opacity (0 - 1) // $x_offset - horizontal offset in pixels // $y_offset - vertical offset in pixels // public function overlay($overlay_file, $position = 'center', $opacity = 1, $x_offset = 0, $y_offset = 0) { // Load overlay image $overlay = new SimpleImage($overlay_file); // Convert opacity $opacity = $opacity * 100; // Determine position switch( strtolower($position) ) { case 'top left': $x = 0 + $x_offset; $y = 0 + $y_offset; break; case 'top right': $x = $this->width - $overlay->width + $x_offset; $y = 0 + $y_offset; break; case 'top': $x = ($this->width / 2) - ($overlay->width / 2) + $x_offset; $y = 0 + $y_offset; break; case 'bottom left': $x = 0 + $x_offset; $y = $this->height - $overlay->height + $y_offset; break; case 'bottom right': $x = $this->width - $overlay->width + $x_offset; $y = $this->height - $overlay->height + $y_offset; break; case 'bottom': $x = ($this->width / 2) - ($overlay->width / 2) + $x_offset; $y = $this->height - $overlay->height + $y_offset; break; case 'left': $x = 0 + $x_offset; $y = ($this->height / 2) - ($overlay->height / 2) + $y_offset; break; case 'right': $x = $this->width - $overlay->width + $x_offset; $y = ($this->height / 2) - ($overlay->height / 2) + $y_offset; break; case 'center': default: $x = ($this->width / 2) - ($overlay->width / 2) + $x_offset; $y = ($this->height / 2) - ($overlay->height / 2) + $y_offset; break; } $this->imagecopymerge_alpha($this->image, $overlay->image, $x, $y, 0, 0, $overlay->width, $overlay->height, $opacity); return $this; } // // Text (adds text to an image) // // $text - the text to add (required) // $font_file - the font to use (required) // $font_size - font size in points // $color - font color in hex // $position - 'center', 'top', 'left', 'bottom', 'right', 'top left', // 'top right', 'bottom left', 'bottom right' // $x_offset - horizontal offset in pixels // $y_offset - vertical offset in pixels // public function text($text, $font_file, $font_size = '12', $color = '#000000', $position = 'center', $x_offset = 0, $y_offset = 0) { // todo - this method could be improved to support the text angle $angle = 0; $rgb = $this->hex2rgb($color); $color = imagecolorallocate($this->image, $rgb['r'], $rgb['g'], $rgb['b']); // Determine textbox size $box = imagettfbbox($font_size, $angle, $font_file, $text); if( !$box ) throw new Exception('Unable to load font: ' . $font_file); $box_width = abs($box[6] - $box[2]); $box_height = abs($box[7] - $box[1]); // Determine position switch( strtolower($position) ) { case 'top left': $x = 0 + $x_offset; $y = 0 + $y_offset + $box_height; break; case 'top right': $x = $this->width - $box_width + $x_offset; $y = 0 + $y_offset + $box_height; break; case 'top': $x = ($this->width / 2) - ($box_width / 2) + $x_offset; $y = 0 + $y_offset + $box_height; break; case 'bottom left': $x = 0 + $x_offset; $y = $this->height - $box_height + $y_offset + $box_height; break; case 'bottom right': $x = $this->width - $box_width + $x_offset; $y = $this->height - $box_height + $y_offset + $box_height; break; case 'bottom': $x = ($this->width / 2) - ($box_width / 2) + $x_offset; $y = $this->height - $box_height + $y_offset + $box_height; break; case 'left': $x = 0 + $x_offset; $y = ($this->height / 2) - (($box_height / 2) - $box_height) + $y_offset; break; case 'right'; $x = $this->width - $box_width + $x_offset; $y = ($this->height / 2) - (($box_height / 2) - $box_height) + $y_offset; break; case 'center': default: $x = ($this->width / 2) - ($box_width / 2) + $x_offset; $y = ($this->height / 2) - (($box_height / 2) - $box_height) + $y_offset; break; } imagettftext($this->image, $font_size, $angle, $x, $y, $color, $font_file, $text); return $this; } // Same as PHP's imagecopymerge() function, except preserves alpha-transparency in 24-bit PNGs // Courtest of: http://www.php.net/manual/en/function.imagecopymerge.php#88456 private function imagecopymerge_alpha($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct ) { $pct /= 100; // Get image width and height $w = imagesx($src_im); $h = imagesy($src_im); // Turn alpha blending off imagealphablending($src_im, false); // Find the most opaque pixel in the image (the one with the smallest alpha value) $minalpha = 127; for( $x = 0; $x < $w; $x++ ) { for( $y = 0; $y < $h; $y++ ) { $alpha = (imagecolorat( $src_im, $x, $y ) >> 24) & 0xFF; if( $alpha < $minalpha ) { $minalpha = $alpha; } } } // Loop through image pixels and modify alpha for each for( $x = 0; $x < $w; $x++ ) { for( $y = 0; $y < $h; $y++ ) { // Get current alpha value (represents the TANSPARENCY!) $colorxy = imagecolorat($src_im, $x, $y); $alpha = ($colorxy >> 24) & 0xFF; // Calculate new alpha if( $minalpha !== 127 ) { $alpha = 127 + 127 * $pct * ($alpha - 127) / (127 - $minalpha); } else { $alpha += 127 * $pct; } // Get the color index with new alpha $alphacolorxy = imagecolorallocatealpha($src_im, ($colorxy >> 16) & 0xFF, ($colorxy >> 8) & 0xFF, $colorxy & 0xFF, $alpha); // Set pixel with the new color + opacity if( !imagesetpixel($src_im, $x, $y, $alphacolorxy) ) return false; } } imagecopy($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h); } // // Ensures $value is always within $min and $max range. // If lower, $min is returned. If higher, $max is returned. // private function keep_within($value, $min, $max) { if( $value < $min ) return $min; if( $value > $max ) return $max; return $value; } // // Returns the file extension of the specified file // private function file_ext($filename) { if( !preg_match('/\./', $filename) ) return ''; return preg_replace('/^.*\./', '', $filename); } // // Converts a hex color value to its RGB equivalent // private function hex2rgb($hex_color) { if( $hex_color[0] == '#' ) $hex_color = substr($hex_color, 1); if( strlen($hex_color) == 6 ) { list($r, $g, $b) = array( $hex_color[0] . $hex_color[1], $hex_color[2] . $hex_color[3], $hex_color[4] . $hex_color[5] ); } elseif( strlen($hex_color) == 3 ) { list($r, $g, $b) = array( $hex_color[0] . $hex_color[0], $hex_color[1] . $hex_color[1], $hex_color[2] . $hex_color[2] ); } else { return false; } return array( 'r' => hexdec($r), 'g' => hexdec($g), 'b' => hexdec($b) ); } }
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