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<?php
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/**
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* @file
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* Functions for the generation of the CAPTCHA image.
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*
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* Loosely Based on MyCaptcha by Heine Deelstra
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* (http://heine.familiedeelstra.com/mycaptcha-download)
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*/
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/**
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* Menu callback function that generates the CAPTCHA image.
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*/
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function image_captcha_image() {
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// If output buffering is on: discard current content and disable further buffering.
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if (ob_get_level()) {
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ob_end_clean();
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}
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if (!isset($_GET['sid']) || is_array($_GET['sid'])) {
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exit();
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}
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$captcha_sid = $_GET['sid'];
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// Get solution (the code to show).
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$code = db_query("SELECT solution FROM {captcha_sessions} WHERE csid = :csid",
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array(':csid' => $captcha_sid)
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)->fetchField();
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// Only generate captcha if code exists in the session.
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if ($code !== FALSE) {
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// Seed the random generators used for image CAPTCHA distortion based on session and code
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// to counter attacks that re-request the same challenge and pick the simplest image one or combine info.
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$seed = (int) hexdec(substr(md5($captcha_sid . $code), 0, 8));
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srand($seed);
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mt_srand($seed);
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// Generate the image.
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$image = @_image_captcha_generate_image($code);
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// Check of generation was successful.
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if (!$image) {
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watchdog('CAPTCHA', 'Generation of image CAPTCHA failed. Check your image CAPTCHA configuration and especially the used font.', array(), WATCHDOG_ERROR);
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exit();
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}
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// Send the image resource as an image file to the client.
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$file_format = variable_get('image_captcha_file_format', IMAGE_CAPTCHA_FILE_FORMAT_JPG);
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if ($file_format == IMAGE_CAPTCHA_FILE_FORMAT_JPG) {
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drupal_add_http_header('Content-Type', 'image/jpeg');
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imagejpeg($image);
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}
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else {
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drupal_add_http_header('Content-Type', 'image/png');
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imagepng($image);
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}
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// Clean up the image resource.
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imagedestroy($image);
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}
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exit();
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}
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/**
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* Small helper function for parsing a hexadecimal color to a RGB tuple.
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*/
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function _image_captcha_hex_to_rgb($hex) {
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// Handle #RGB format/
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if (strlen($hex) == 4) {
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$hex = $hex[1] . $hex[1] . $hex[2] . $hex[2] . $hex[3] . $hex[3];
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}
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$c = hexdec($hex);
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$rgb = array();
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for ($i = 16; $i >= 0; $i -= 8) {
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$rgb[] = ($c >> $i) & 0xFF;
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}
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return $rgb;
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}
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/**
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* Base function for generating a image CAPTCHA.
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*/
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function _image_captcha_generate_image($code) {
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// Get font.
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$fonts = _image_captcha_get_enabled_fonts();
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// Get other settings.
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$font_size = (int) variable_get('image_captcha_font_size', 30);
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list($width, $height) = _image_captcha_image_size($code);
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// Create image resource.
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$image = imagecreatetruecolor($width, $height);
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if (!$image) {
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return FALSE;
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}
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// Get the background color and paint the background.
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$background_rgb = _image_captcha_hex_to_rgb(variable_get('image_captcha_background_color', '#ffffff'));
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$background_color = imagecolorallocate($image, $background_rgb[0], $background_rgb[1], $background_rgb[2]);
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// Set transparency if needed.
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$file_format = variable_get('image_captcha_file_format', IMAGE_CAPTCHA_FILE_FORMAT_JPG);
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if ($file_format == IMAGE_CAPTCHA_FILE_FORMAT_TRANSPARENT_PNG) {
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imagecolortransparent($image, $background_color);
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}
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imagefilledrectangle($image, 0, 0, $width, $height, $background_color);
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// Do we need to draw in RTL mode?
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global $language;
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$rtl = $language->direction && ((bool) variable_get('image_captcha_rtl_support', 0));
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// Draw text.
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$result = _image_captcha_image_generator_print_string($image, $width, $height, $fonts, $font_size, $code, $rtl);
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if (!$result) {
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return FALSE;
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}
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// Add noise.
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$noise_colors = array();
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for ($i = 0; $i < 20; $i++) {
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$noise_colors[] = imagecolorallocate($image, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
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}
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// Add additional noise.
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if (variable_get('image_captcha_dot_noise', 0)) {
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_image_captcha_image_generator_add_dots($image, $width, $height, $noise_colors);
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}
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if (variable_get('image_captcha_line_noise', 0)) {
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_image_captcha_image_generator_add_lines($image, $width, $height, $noise_colors);
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}
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// Distort the image.
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$distortion_amplitude = .25 * $font_size * variable_get('image_captcha_distortion_amplitude', 0) / 10.0;
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if ($distortion_amplitude > 1) {
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// Distortion parameters.
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$wavelength_xr = (2 + 3 * mt_rand(0, 1000) / 1000) * $font_size;
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$wavelength_yr = (2 + 3 * mt_rand(0, 1000) / 1000) * $font_size;
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$freq_xr = 2 * 3.141592 / $wavelength_xr;
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$freq_yr = 2 * 3.141592 / $wavelength_yr;
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$wavelength_xt = (2 + 3 * mt_rand(0, 1000) / 1000) * $font_size;
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$wavelength_yt = (2 + 3 * mt_rand(0, 1000) / 1000) * $font_size;
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$freq_xt = 2 * 3.141592 / $wavelength_xt;
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$freq_yt = 2 * 3.141592 / $wavelength_yt;
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$distorted_image = imagecreatetruecolor($width, $height);
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if ($file_format == IMAGE_CAPTCHA_FILE_FORMAT_TRANSPARENT_PNG) {
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imagecolortransparent($distorted_image, $background_color);
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}
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if (!$distorted_image) {
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return FALSE;
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}
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if (variable_get('image_captcha_bilinear_interpolation', FALSE)) {
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// Distortion with bilinear interpolation.
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for ($x = 0; $x < $width; $x++) {
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for ($y = 0; $y < $height; $y++) {
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// Get distorted sample point in source image.
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$r = $distortion_amplitude * sin($x * $freq_xr + $y * $freq_yr);
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$theta = $x * $freq_xt + $y * $freq_yt;
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$sx = $x + $r * cos($theta);
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$sy = $y + $r * sin($theta);
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$sxf = (int) floor($sx);
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$syf = (int) floor($sy);
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if ($sxf < 0 || $syf < 0 || $sxf >= $width - 1 || $syf >= $height - 1) {
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$color = $background_color;
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}
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else {
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// Bilinear interpolation: sample at four corners.
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$color_00 = imagecolorat($image, $sxf, $syf);
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$color_00_r = ($color_00 >> 16) & 0xFF;
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$color_00_g = ($color_00 >> 8) & 0xFF;
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$color_00_b = $color_00 & 0xFF;
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$color_10 = imagecolorat($image, $sxf + 1, $syf);
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$color_10_r = ($color_10 >> 16) & 0xFF;
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$color_10_g = ($color_10 >> 8) & 0xFF;
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$color_10_b = $color_10 & 0xFF;
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$color_01 = imagecolorat($image, $sxf, $syf + 1);
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$color_01_r = ($color_01 >> 16) & 0xFF;
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$color_01_g = ($color_01 >> 8) & 0xFF;
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$color_01_b = $color_01 & 0xFF;
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$color_11 = imagecolorat($image, $sxf + 1, $syf + 1);
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$color_11_r = ($color_11 >> 16) & 0xFF;
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$color_11_g = ($color_11 >> 8) & 0xFF;
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$color_11_b = $color_11 & 0xFF;
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// Interpolation factors.
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$u = $sx - $sxf;
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$v = $sy - $syf;
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// Interpolate.
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$r = (int) ((1 - $v) * ((1 - $u) * $color_00_r + $u * $color_10_r) + $v * ((1 - $u) * $color_01_r + $u * $color_11_r));
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$g = (int) ((1 - $v) * ((1 - $u) * $color_00_g + $u * $color_10_g) + $v * ((1 - $u) * $color_01_g + $u * $color_11_g));
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$b = (int) ((1 - $v) * ((1 - $u) * $color_00_b + $u * $color_10_b) + $v * ((1 - $u) * $color_01_b + $u * $color_11_b));
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// Build color.
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$color = ($r<<16) + ($g<<8) + $b;
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}
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imagesetpixel($distorted_image, $x, $y, $color);
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}
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}
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}
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else {
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// Distortion with nearest neighbor interpolation.
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for ($x = 0; $x < $width; $x++) {
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for ($y = 0; $y < $height; $y++) {
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// Get distorted sample point in source image.
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$r = $distortion_amplitude * sin($x * $freq_xr + $y * $freq_yr);
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$theta = $x * $freq_xt + $y * $freq_yt;
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$sx = $x + $r * cos($theta);
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$sy = $y + $r * sin($theta);
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$sxf = (int) floor($sx);
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$syf = (int) floor($sy);
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if ($sxf < 0 || $syf < 0 || $sxf >= $width - 1 || $syf >= $height - 1) {
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$color = $background_color;
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}
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else {
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$color = imagecolorat($image, $sxf, $syf);
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}
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imagesetpixel($distorted_image, $x, $y, $color);
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}
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}
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}
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// Release undistorted image.
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imagedestroy($image);
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// Return distorted image.
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return $distorted_image;
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}
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else {
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return $image;
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}
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}
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/**
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* Add lines.
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*/
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function _image_captcha_image_generator_add_lines(&$image, $width, $height, $colors) {
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$line_quantity = $width * $height / 200.0 * ((int) variable_get('image_captcha_noise_level', 5)) / 10.0;
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for ($i = 0; $i < $line_quantity; $i++) {
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imageline($image, mt_rand(0, $width), mt_rand(0, $height), mt_rand(0, $width), mt_rand(0, $height), $colors[array_rand($colors)]);
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}
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}
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/**
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* Add dots.
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*/
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function _image_captcha_image_generator_add_dots(&$image, $width, $height, $colors) {
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$noise_quantity = $width * $height * ((int) variable_get('image_captcha_noise_level', 5)) / 10.0;
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for ($i = 0; $i < $noise_quantity; $i++) {
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imagesetpixel($image, mt_rand(0, $width), mt_rand(0, $height), $colors[array_rand($colors)]);
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}
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}
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/**
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* Helper function for drawing text on the image.
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*/
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function _image_captcha_image_generator_print_string(&$image, $width, $height, $fonts, $font_size, $text, $rtl = FALSE) {
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// Get characters.
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$characters = _image_captcha_utf8_split($text);
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$character_quantity = count($characters);
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// Get colors.
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$background_rgb = _image_captcha_hex_to_rgb(variable_get('image_captcha_background_color', '#ffffff'));
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$foreground_rgb = _image_captcha_hex_to_rgb(variable_get('image_captcha_foreground_color', '#000000'));
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$background_color = imagecolorallocate($image, $background_rgb[0], $background_rgb[1], $background_rgb[2]);
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$foreground_color = imagecolorallocate($image, $foreground_rgb[0], $foreground_rgb[1], $foreground_rgb[2]);
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// Precalculate the value ranges for color randomness.
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$foreground_randomness = (int) (variable_get('image_captcha_foreground_color_randomness', 100));
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if ($foreground_randomness) {
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$foreground_color_range = array();
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for ($i = 0; $i < 3; $i++) {
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$foreground_color_range[$i] = array(
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max(0, $foreground_rgb[$i] - $foreground_randomness),
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min(255, $foreground_rgb[$i] + $foreground_randomness),
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);
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}
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}
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// Set default text color.
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$color = $foreground_color;
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// The image is seperated in different character cages, one for each character,
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273 |
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// each character will be somewhere inside that cage.
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274 |
85ad3d82
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Assos Assos
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$ccage_width = $width / $character_quantity;
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275 |
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$ccage_height = $height;
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276 |
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|
277 |
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foreach ($characters as $c => $character) {
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278 |
ac1bc5de
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Assos Assos
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// Initial position of character: in the center of its cage.
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279 |
85ad3d82
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Assos Assos
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$center_x = ($c + 0.5) * $ccage_width;
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280 |
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if ($rtl) {
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281 |
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$center_x = $width - $center_x;
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282 |
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}
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283 |
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$center_y = 0.5 * $height;
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284 |
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285 |
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// Pick a random font from the list.
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286 |
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$font = $fonts[array_rand($fonts)];
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287 |
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|
288 |
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// Get character dimensions for TrueType fonts.
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289 |
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if ($font != 'BUILTIN') {
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290 |
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$bbox = imagettfbbox($font_size, 0, drupal_realpath($font), $character);
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291 |
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// In very rare cases with some versions of the GD library, the x-value
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292 |
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// of the left side of the bounding box as returned by the first call of
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293 |
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// imagettfbbox is corrupt (value -2147483648 = 0x80000000).
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294 |
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// The weird thing is that calling the function a second time
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295 |
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// can be used as workaround.
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296 |
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// This issue is discussed at http://drupal.org/node/349218.
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297 |
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if ($bbox[2] < 0) {
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298 |
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$bbox = imagettfbbox($font_size, 0, drupal_realpath($font), $character);
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299 |
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}
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300 |
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}
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301 |
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else {
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302 |
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$character_width = imagefontwidth(5);
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303 |
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$character_height = imagefontheight(5);
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304 |
ac1bc5de
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Assos Assos
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$bbox = array(
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305 |
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0,
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306 |
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$character_height,
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307 |
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$character_width,
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308 |
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$character_height,
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309 |
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$character_width,
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310 |
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0,
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311 |
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0,
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312 |
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0,
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313 |
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);
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314 |
85ad3d82
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Assos Assos
|
}
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315 |
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|
316 |
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// Random (but small) rotation of the character.
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317 |
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// TODO: add a setting for this?
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318 |
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$angle = mt_rand(-10, 10);
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319 |
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|
320 |
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// Determine print position: at what coordinate should the character be
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321 |
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// printed so that the bounding box would be nicely centered in the cage?
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322 |
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$bb_center_x = .5 * ($bbox[0] + $bbox[2]);
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323 |
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$bb_center_y = .5 * ($bbox[1] + $bbox[7]);
|
324 |
ac1bc5de
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Assos Assos
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$angle_cos = cos($angle * 3.1415 / 180);
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325 |
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$angle_sin = sin($angle * 3.1415 / 180);
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326 |
85ad3d82
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Assos Assos
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$pos_x = $center_x - ($angle_cos * $bb_center_x + $angle_sin * $bb_center_y);
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327 |
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$pos_y = $center_y - (-$angle_sin * $bb_center_x + $angle_cos * $bb_center_y);
|
328 |
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|
329 |
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// Calculate available room to jitter: how much can the character be moved
|
330 |
|
|
// so that it stays inside its cage?
|
331 |
|
|
$bb_width = $bbox[2] - $bbox[0];
|
332 |
|
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$bb_height = $bbox[1] - $bbox[7];
|
333 |
|
|
$dev_x = .5 * max(0, $ccage_width - abs($angle_cos) * $bb_width - abs($angle_sin) * $bb_height);
|
334 |
|
|
$dev_y = .5 * max(0, $ccage_height - abs($angle_cos) * $bb_height - abs($angle_sin) * $bb_width);
|
335 |
|
|
|
336 |
ac1bc5de
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Assos Assos
|
// Add jitter to position.
|
337 |
85ad3d82
|
Assos Assos
|
$pos_x = $pos_x + mt_rand(-$dev_x, $dev_x);
|
338 |
|
|
$pos_y = $pos_y + mt_rand(-$dev_y, $dev_y);
|
339 |
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|
|
340 |
ac1bc5de
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Assos Assos
|
// Calculate text color in case of randomness.
|
341 |
85ad3d82
|
Assos Assos
|
if ($foreground_randomness) {
|
342 |
|
|
$color = imagecolorallocate($image,
|
343 |
|
|
mt_rand($foreground_color_range[0][0], $foreground_color_range[0][1]),
|
344 |
|
|
mt_rand($foreground_color_range[1][0], $foreground_color_range[1][1]),
|
345 |
|
|
mt_rand($foreground_color_range[2][0], $foreground_color_range[2][1])
|
346 |
|
|
);
|
347 |
|
|
}
|
348 |
|
|
|
349 |
ac1bc5de
|
Assos Assos
|
// Draw character.
|
350 |
85ad3d82
|
Assos Assos
|
if ($font == 'BUILTIN') {
|
351 |
|
|
imagestring($image, 5, $pos_x, $pos_y, $character, $color);
|
352 |
|
|
}
|
353 |
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|
else {
|
354 |
|
|
imagettftext($image, $font_size, $angle, $pos_x, $pos_y, $color, drupal_realpath($font), $character);
|
355 |
|
|
}
|
356 |
|
|
|
357 |
|
|
// For debugging purposes: draw character bounding box (only valid when rotation is disabled).
|
358 |
|
|
// imagerectangle($image, $pos_x + $bbox[0], $pos_y + $bbox[1], $pos_x + $bbox[2], $pos_y + $bbox[7], $color);
|
359 |
|
|
}
|
360 |
|
|
|
361 |
ac1bc5de
|
Assos Assos
|
// Return a sign of success.
|
362 |
85ad3d82
|
Assos Assos
|
return TRUE;
|
363 |
|
|
} |