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<?php
/** * library for image handling using the GD library of functions * @package core */ // force UTF-8 Ø
$_zp_graphics_optionhandlers[] = new lib_GD_Options(); // register option handler /** * Option class for lib-GD * */
class lib_GD_Options {
function __construct() {
}
/** * Standard option interface * * @return array */ function getOptionsSupported() { if (defined('GD_FREETYPE') && GD_FREETYPE) { return array(gettext('GD TypeFace path') => array('key' => 'GD_FreeType_Path', 'type' => OPTION_TYPE_TEXTBOX, 'desc' => gettext('Supply the full path to your TrueType fonts.'))); } else { return array(); } }
function canLoadMsg() { if (extension_loaded('gd')) { return ''; } else { return gettext('The <strong><em>GD</em></strong> extension is not available.'); } }
}
if (!function_exists('zp_graphicsLibInfo')) {
/** * Zenphoto image manipulation functions using the PHP GD library * */ if (extension_loaded('gd')) { // only define the functions if we have the proper versions $_lib_GD_info = array(); $info = gd_info(); $_lib_GD_info['Library'] = 'GD'; $_lib_GD_info['Library_desc'] = sprintf(gettext('PHP GD library <em>%s</em>'), $info['GD Version']); $_lib_GD_info['FreeType'] = $info['FreeType Support']; define('GD_FREETYPE', (bool) $_lib_GD_info['FreeType']); unset($_lib_GD_info['FreeType']); define('GD_FREETYPE_SAMPLE', 'The quick brown fox jumps over the lazy dog'); define('GD_FREETYPE_SAMPLE_CHARS', strlen('GD_FREETYPE_SAMPLE')); $_gd_freetype_fonts = array(0);
$imgtypes = imagetypes(); $_lib_GD_info['GIF'] = ($imgtypes & IMG_GIF) ? 'gif' : false; $_lib_GD_info['JPG'] = ($imgtypes & IMG_JPG) ? 'jpg' : false; $_lib_GD_info['JPEG'] = ($imgtypes & IMG_JPG) ? 'jpg' : false; $_lib_GD_info['PNG'] = ($imgtypes & IMG_PNG) ? 'png' : false; $_lib_GD_info['BMP'] = ($imgtypes & IMG_WBMP) ? 'jpg' : false; unset($imgtypes); unset($info);
if (DEBUG_IMAGE) debugLog("Loading " . $_lib_GD_info['Library']);
/** * Takes an image filename and returns a GD Image using the correct function * for the image's format (imagecreatefrom*). Supports JPEG, GIF, and PNG. * @param string $imagefile the full path and filename of the image to load. * @return image the loaded GD image object. * */ function zp_imageGet($imgfile) { $ext = getSuffix($imgfile); switch ($ext) { case 'png': return imagecreatefrompng($imgfile); case 'wbmp': return imagecreatefromwbmp($imgfile); case 'jpeg': case 'jpg': return imagecreatefromjpeg($imgfile); case 'gif': return imagecreatefromgif($imgfile); } return false; }
/** * outputs an image resource as a given type * * @param resource $im * @param string $type * @param string $filename * @param int $qual */ function zp_imageOutput($im, $type, $filename = NULL, $qual = 75) { $qual = max(min($qual, 100), 0); if (getOption('image_interlace')) { imageinterlace($im, true); } switch ($type) { case 'png': $qual = max(0, 9 - round($qual / 10)); return imagepng($im, $filename, $qual); case 'wbmp': return imagewbmp($im, $filename); case 'jpeg': case 'jpg': return imagejpeg($im, $filename, $qual); case 'gif': return imagegif($im, $filename); } return false; }
/** * Creates a true color image * * @param int $w the width of the image * @param int $h the height of the image * @return image */ function zp_createImage($w, $h) { return imagecreatetruecolor($w, $h); }
/** * Fills an image area * * @param image $image * @param int $x * @param int $y * @param color $color * @return bool */ function zp_imageFill($image, $x, $y, $color) { return imagefill($image, $x, $y, $color); }
/** * Sets the transparency color * * @param image $image * @param color $color * @return bool */ function zp_imageColorTransparent($image, $color) { return imagecolortransparent($image, $color); }
/** * copies an image canvas * * @param image $imgCanvas source canvas * @param image $img destination canvas * @param int $dest_x destination x * @param int $dest_y destination y * @param int $src_x source x * @param int $src_y source y * @param int $w width * @param int $h height */ function zp_copyCanvas($imgCanvas, $img, $dest_x, $dest_y, $src_x, $src_y, $w, $h) { return imageCopy($imgCanvas, $img, $dest_x, $dest_y, $src_x, $src_y, $w, $h); }
/** * resamples an image to a new copy * * @param resource $dst_image * @param resource $src_image * @param int $dst_x * @param int $dst_y * @param int $src_x * @param int $src_y * @param int $dst_w * @param int $dst_h * @param int $src_w * @param int $src_h * @return bool */ function zp_resampleImage($dst_image, $src_image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) { return imagecopyresampled($dst_image, $src_image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h); }
/** * Sharpens an image using an Unsharp Mask filter. * * Original description from the author: * * WARNING ! Due to a known bug in PHP 4.3.2 this script is not working well in this * version. The sharpened images get too dark. The bug is fixed in version 4.3.3. * * From version 2 (July 17 2006) the script uses the imageconvolution function in * PHP version >= 5.1, which improves the performance considerably. * * Unsharp masking is a traditional darkroom technique that has proven very * suitable for digital imaging. The principle of unsharp masking is to create a * blurred copy of the image and compare it to the underlying original. The * difference in colour values between the two images is greatest for the pixels * near sharp edges. When this difference is subtracted from the original image, * the edges will be accentuated. * * The Amount parameter simply says how much of the effect you want. 100 is * 'normal'. Radius is the radius of the blurring circle of the mask. 'Threshold' * is the least difference in colour values that is allowed between the original * and the mask. In practice this means that low-contrast areas of the picture are * left unrendered whereas edges are treated normally. This is good for pictures of * e.g. skin or blue skies. * * Any suggenstions for improvement of the algorithm, expecially regarding the * speed and the roundoff errors in the Gaussian blur process, are welcome. * * Permission to license this code under the GPL was granted by the author on 2/12/2007. * * @param image $img the GD format image to sharpen. This is not a URL string, but * should be the result of a GD image function. * @param int $amount the strength of the sharpening effect. Nominal values are between 0 and 100. * @param int $radius the pixel radius of the sharpening mask. A smaller radius sharpens smaller * details, and a larger radius sharpens larger details. * @param int $threshold the color difference threshold required for sharpening. A low threshold * sharpens all edges including faint ones, while a higher threshold only sharpens more distinct edges. * @return image the input image with the specified sharpening applied. */ function zp_imageUnsharpMask($img, $amount, $radius, $threshold) { /* Unsharp Mask for PHP - version 2.0 Unsharp mask algorithm by Torstein Hønsi 2003-06. Please leave this notice. */
// $img is an image that is already created within php using // imgcreatetruecolor. No url! $img must be a truecolor image. // Attempt to calibrate the parameters to Photoshop: if ($amount > 500) $amount = 500; $amount = $amount * 0.016; if ($radius > 50) $radius = 50; $radius = $radius * 2; if ($threshold > 255) $threshold = 255;
$radius = abs(round($radius)); // Only integers make sense. if ($radius == 0) return $img; $w = imagesx($img); $h = imagesy($img); $imgCanvas = imagecreatetruecolor($w, $h); $imgCanvas2 = imagecreatetruecolor($w, $h); imagecopy($imgCanvas, $img, 0, 0, 0, 0, $w, $h); imagecopy($imgCanvas2, $img, 0, 0, 0, 0, $w, $h);
imageBlurGD($imgCanvas, $imgCanvas2, $radius, $w, $h);
// Calculate the difference between the blurred pixels and the original // and set the pixels for ($x = 0; $x < $w; $x++) { // each row for ($y = 0; $y < $h; $y++) { // each pixel $rgbOrig = ImageColorAt($imgCanvas2, $x, $y); $rOrig = (($rgbOrig >> 16) & 0xFF); $gOrig = (($rgbOrig >> 8) & 0xFF); $bOrig = ($rgbOrig & 0xFF);
$rgbBlur = ImageColorAt($imgCanvas, $x, $y);
$rBlur = (($rgbBlur >> 16) & 0xFF); $gBlur = (($rgbBlur >> 8) & 0xFF); $bBlur = ($rgbBlur & 0xFF);
// When the masked pixels differ less from the original // than the threshold specifies, they are set to their original value. $rNew = (abs($rOrig - $rBlur) >= $threshold) ? max(0, min(255, ($amount * ($rOrig - $rBlur)) + $rOrig)) : $rOrig; $gNew = (abs($gOrig - $gBlur) >= $threshold) ? max(0, min(255, ($amount * ($gOrig - $gBlur)) + $gOrig)) : $gOrig; $bNew = (abs($bOrig - $bBlur) >= $threshold) ? max(0, min(255, ($amount * ($bOrig - $bBlur)) + $bOrig)) : $bOrig;
if (($rOrig != $rNew) || ($gOrig != $gNew) || ($bOrig != $bNew)) { $pixCol = ImageColorAllocate($img, $rNew, $gNew, $bNew); ImageSetPixel($img, $x, $y, $pixCol); } } } return $img; }
/** * Resize a PNG file with transparency to given dimensions * and still retain the alpha channel information * Author: Alex Le - http://www.alexle.net * * * @param image $src * @param int $w * @param int $h * @return image */ function zp_imageResizeAlpha(&$src, $w, $h) { /* create a new image with the new width and height */ if ($temp = @imagecreatetruecolor($w, $h)) {
/* making the new image transparent */ $background = imagecolorallocate($temp, 0, 0, 0); imagecolortransparent($temp, $background); // make the new temp image all transparent imagealphablending($temp, false); // turn off the alpha blending to keep the alpha channel
/* Resize the PNG file */ /* use imagecopyresized to gain some performance but loose some quality */ imagecopyresampled($temp, $src, 0, 0, 0, 0, $w, $h, imagesx($src), imagesy($src)); /* use imagecopyresampled if you concern more about the quality */ //imagecopyresampled($temp, $src, 0, 0, 0, 0, $w, $h, imagesx($src), imagesy($src)); } return $temp; }
/** * Returns true if GD library is configued with image rotation suppord * * @return bool */ function zp_imageCanRotate() { return function_exists('imagerotate'); }
/** * Rotates an image resource according to its Orientation * NB: requires the imagarotate function to be configured * * @param resource $im * @param int $rotate * @return resource */ function zp_rotateImage($im, $rotate) { $newim_rot = imagerotate($im, $rotate, 0); imagedestroy($im); return $newim_rot; }
/** * Returns the image height and width * * @param string $filename * @return array */ function zp_imageDims($filename) { $imageinfo = NULL; $rslt = getimagesize($filename, $imageinfo); if (is_array($rslt)) { return array('width' => $rslt[0], 'height' => $rslt[1]); } else { return false; } }
/** * Returns the IPTC data of an image * * @param string $filename * @return string */ function zp_imageIPTC($filename) { $imageinfo = NULL; $rslt = getimagesize($filename, $imageinfo); if (is_array($rslt) && isset($imageinfo['APP13'])) { return $imageinfo['APP13']; } else { return false; } }
/** * Returns the width of an image resource * * @param resource $im * @return int */ function zp_imageWidth($im) { return imagesx($im); }
/** * Returns the height of an image resource * * @param resource $im * @return int */ function zp_imageHeight($im) { return imagesy($im); }
/** * Does a copy merge of two image resources * * @param resource $dst_im * @param resource $src_im * @param int $dst_x * @param int $dst_y * @param int $src_x * @param int $src_y * @param int $src_w * @param int $src_h * @param int $pct * @return bool */ function zp_imageMerge($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct) { return imagecopymerge($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct); }
/** * Creates a grayscale image * * @param resource $image * @return resource */ function zp_imageGray($image) { $img_height = imagesy($image); $img_width = imagesx($image); for ($y = 0; $y < $img_height; $y++) { for ($x = 0; $x < $img_width; $x++) { $gray = (ImageColorAt($image, $x, $y) >> 8) & 0xFF; imagesetpixel($image, $x, $y, ImageColorAllocate($image, $gray, $gray, $gray)); } } }
/** * destroys an image resource * * @param resource $im * @return bool */ function zp_imageKill($im) { return imagedestroy($im); }
/** * Returns an RGB color identifier * * @param resource $image * @param int $red * @param int $green * @param int $blue * @return int */ function zp_colorAllocate($image, $red, $green, $blue) { return imagecolorallocate($image, $red, $green, $blue); }
/** * Rencers a string into the image * * @param resource $image * @param int $font * @param int $x * @param int $y * @param string $string * @param int $color * @return bool */ function zp_writeString($image, $font, $x, $y, $string, $color) { global $_gd_freetype_fonts; if ($font > 0) { return imagestring($image, $font, $x, $y, $string, $color); } else { $font = abs($font); $fontfile = $_gd_freetype_fonts[$font]['path']; $size = $_gd_freetype_fonts[abs($font)]['size']; $bbox = imagettfbbox($_gd_freetype_fonts[$font]['size'], 0, $_gd_freetype_fonts[$font]['path'], GD_FREETYPE_SAMPLE); $w = (int) (($bbox[2] - $bbox[0]) / GD_FREETYPE_SAMPLE_CHARS); $h = $bbox[1] - $bbox[7]; $rslt = imagettftext($image, $size, 0, $x + $w, $y + $h, $color, $fontfile, $string); return is_array($rslt); } }
/** * Creates a rectangle * * @param resource $image * @param int $x1 * @param int $y1 * @param int $x2 * @param int $y2 * @param int $color * @return bool */ function zp_drawRectangle($image, $x1, $y1, $x2, $y2, $color) { return imagerectangle($image, $x1, $y1, $x2, $y2, $color); }
/** * Returns array of graphics library info * * @return array */ function zp_graphicsLibInfo() { global $_lib_GD_info; return $_lib_GD_info; }
/** * Returns a list of available fonts * * @return array */ function zp_getFonts() { global $_gd_fontlist; if (!is_array($_gd_fontlist)) { $_gd_fontlist = array('system' => ''); $curdir = getcwd(); $basefile = SERVERPATH . '/' . USER_PLUGIN_FOLDER . 'gd_fonts/'; if (is_dir($basefile)) { chdir($basefile); $filelist = safe_glob('*.gdf'); foreach ($filelist as $file) { $key = filesystemToInternal(str_replace('.gdf', '', $file)); $_gd_fontlist[$key] = $basefile . '/' . $file; } } chdir($basefile = SERVERPATH . '/' . ZENFOLDER . '/gd_fonts'); $filelist = safe_glob('*.gdf'); foreach ($filelist as $file) { $key = filesystemToInternal(preg_replace('/\.gdf/i', '', $file)); $_gd_fontlist[$key] = $basefile . '/' . $file; } if (GD_FREETYPE) { $basefile = rtrim(getOption('GD_FreeType_Path') . '/'); if (is_dir($basefile)) { chdir($basefile); $filelist = safe_glob('*.ttf'); foreach ($filelist as $file) { $key = filesystemToInternal($file); $_gd_fontlist[$key] = $basefile . '/' . $file; } } } chdir($curdir); } return $_gd_fontlist; }
/** * Loads a font and returns its font id * * @param string $font * @return int */ function zp_imageLoadFont($font = NULL, $size = 18) { global $_gd_freetype_fonts; if (!empty($font)) { if (file_exists($font)) { switch (getSuffix($font)) { case 'gdf': return imageloadfont($font); case 'ttf': $index = -count($_gd_freetype_fonts); array_push($_gd_freetype_fonts, array('path' => $font, 'size' => $size)); return $index; } } } return 5; // default to the largest inbuilt font }
/** * Returns the font width in pixels * * @param int $font * @return int */ function zp_imageFontWidth($font) { global $_gd_freetype_fonts; if ($font > 0) { return imagefontwidth($font); } else { $font = abs($font); $bbox = imagettfbbox($_gd_freetype_fonts[$font]['size'], 0, $_gd_freetype_fonts[$font]['path'], GD_FREETYPE_SAMPLE); $w = (int) (($bbox[2] - $bbox[0]) / GD_FREETYPE_SAMPLE_CHARS); return $w; } }
/** * Returns the font height in pixels * * @param int $font * @return int */ function zp_imageFontHeight($font) { global $_gd_freetype_fonts; if ($font > 0) { return imagefontheight($font); } else { $font = abs($font); $bbox = imagettfbbox($_gd_freetype_fonts[$font]['size'], 0, $_gd_freetype_fonts[$font]['path'], GD_FREETYPE_SAMPLE); $h = $bbox[1] - $bbox[7]; return $h; } }
/** * provides image blur support for lib-GD:zp_imageUnsharpMask * * @param image $imgCanvas * @param int $radius * @param int $w * @param int $h */ function imageBlurGD($imgCanvas, $imgCanvas2, $radius, $w, $h) { // Gaussian blur matrix: // 1 2 1 // 2 4 2 // 1 2 1 ////////////////////////////////////////////////// for ($i = 0; $i < $radius; $i++) { if (function_exists('imageconvolution')) { // PHP >= 5.1 $matrix = array( array(1, 2, 1), array(2, 4, 2), array(1, 2, 1) ); imageconvolution($imgCanvas, $matrix, 16, 0); } } }
/** * * creates an image from an image stream * @param $string */ function zp_imageFromString($string) { return imagecreatefromstring($string); }
} } ?>
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