<?php /** * WordPress GD Image Editor * * @package WordPress * @subpackage Image_Editor */ /** * WordPress Image Editor Class for Image Manipulation through GD * * @since 3.5.0 * * @see WP_Image_Editor */ class WP_Image_Editor_GD extends WP_Image_Editor { /** * GD Resource. * * @var resource|GdImage */ protected $image; public function __destruct() { if ( $this->image ) { // We don't need the original in memory anymore. imagedestroy( $this->image ); } } /** * Checks to see if current environment supports GD. * * @since 3.5.0 * * @param array $args * @return bool */ public static function test( $args = array() ) { if ( ! extension_loaded( 'gd' ) || ! function_exists( 'gd_info' ) ) { return false; } // On some setups GD library does not provide imagerotate() - Ticket #11536. if ( isset( $args['methods'] ) && in_array( 'rotate', $args['methods'], true ) && ! function_exists( 'imagerotate' ) ) { return false; } return true; } /** * Checks to see if editor supports the mime-type specified. * * @since 3.5.0 * * @param string $mime_type * @return bool */ public static function supports_mime_type( $mime_type ) { $image_types = imagetypes(); switch ( $mime_type ) { case 'image/jpeg': return ( $image_types & IMG_JPG ) !== 0; case 'image/png': return ( $image_types & IMG_PNG ) !== 0; case 'image/gif': return ( $image_types & IMG_GIF ) !== 0; case 'image/webp': return ( $image_types & IMG_WEBP ) !== 0; case 'image/avif': return ( $image_types & IMG_AVIF ) !== 0 && function_exists( 'imageavif' ); } return false; } /** * Loads image from $this->file into new GD Resource. * * @since 3.5.0 * * @return true|WP_Error True if loaded successfully; WP_Error on failure. */ public function load() { if ( $this->image ) { return true; } if ( ! is_file( $this->file ) && ! preg_match( '|^https?://|', $this->file ) ) { return new WP_Error( 'error_loading_image', __( 'File does not exist?' ), $this->file ); } // Set artificially high because GD uses uncompressed images in memory. wp_raise_memory_limit( 'image' ); $file_contents = @file_get_contents( $this->file ); if ( ! $file_contents ) { return new WP_Error( 'error_loading_image', __( 'File does not exist?' ), $this->file ); } // Handle WebP and AVIF mime types explicitly, falling back to imagecreatefromstring. if ( function_exists( 'imagecreatefromwebp' ) && ( 'image/webp' === wp_get_image_mime( $this->file ) ) ) { $this->image = @imagecreatefromwebp( $this->file ); } elseif ( function_exists( 'imagecreatefromavif' ) && ( 'image/avif' === wp_get_image_mime( $this->file ) ) ) { $this->image = @imagecreatefromavif( $this->file ); } else { $this->image = @imagecreatefromstring( $file_contents ); } if ( ! is_gd_image( $this->image ) ) { return new WP_Error( 'invalid_image', __( 'File is not an image.' ), $this->file ); } $size = wp_getimagesize( $this->file ); if ( ! $size ) { return new WP_Error( 'invalid_image', __( 'Could not read image size.' ), $this->file ); } if ( function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' ) ) { imagealphablending( $this->image, false ); imagesavealpha( $this->image, true ); } $this->update_size( $size[0], $size[1] ); $this->mime_type = $size['mime']; return $this->set_quality(); } /** * Sets or updates current image size. * * @since 3.5.0 * * @param int $width * @param int $height * @return true */ protected function update_size( $width = false, $height = false ) { if ( ! $width ) { $width = imagesx( $this->image ); } if ( ! $height ) { $height = imagesy( $this->image ); } return parent::update_size( $width, $height ); } /** * Resizes current image. * * Wraps `::_resize()` which returns a GD resource or GdImage instance. * * At minimum, either a height or width must be provided. If one of the two is set * to null, the resize will maintain aspect ratio according to the provided dimension. * * @since 3.5.0 * * @param int|null $max_w Image width. * @param int|null $max_h Image height. * @param bool|array $crop { * Optional. Image cropping behavior. If false, the image will be scaled (default). * If true, image will be cropped to the specified dimensions using center positions. * If an array, the image will be cropped using the array to specify the crop location: * * @type string $0 The x crop position. Accepts 'left', 'center', or 'right'. * @type string $1 The y crop position. Accepts 'top', 'center', or 'bottom'. * } * @return true|WP_Error */ public function resize( $max_w, $max_h, $crop = false ) { if ( ( $this->size['width'] === $max_w ) && ( $this->size['height'] === $max_h ) ) { return true; } $resized = $this->_resize( $max_w, $max_h, $crop ); if ( is_gd_image( $resized ) ) { imagedestroy( $this->image ); $this->image = $resized; return true; } elseif ( is_wp_error( $resized ) ) { return $resized; } return new WP_Error( 'image_resize_error', __( 'Image resize failed.' ), $this->file ); } /** * @param int $max_w * @param int $max_h * @param bool|array $crop { * Optional. Image cropping behavior. If false, the image will be scaled (default). * If true, image will be cropped to the specified dimensions using center positions. * If an array, the image will be cropped using the array to specify the crop location: * * @type string $0 The x crop position. Accepts 'left', 'center', or 'right'. * @type string $1 The y crop position. Accepts 'top', 'center', or 'bottom'. * } * @return resource|GdImage|WP_Error */ protected function _resize( $max_w, $max_h, $crop = false ) { $dims = image_resize_dimensions( $this->size['width'], $this->size['height'], $max_w, $max_h, $crop ); if ( ! $dims ) { return new WP_Error( 'error_getting_dimensions', __( 'Could not calculate resized image dimensions' ), $this->file ); } list( $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h ) = $dims; $this->set_quality( null, array( 'width' => $dst_w, 'height' => $dst_h, ) ); $resized = wp_imagecreatetruecolor( $dst_w, $dst_h ); imagecopyresampled( $resized, $this->image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h ); if ( is_gd_image( $resized ) ) { $this->update_size( $dst_w, $dst_h ); return $resized; } return new WP_Error( 'image_resize_error', __( 'Image resize failed.' ), $this->file ); } /** * Create multiple smaller images from a single source. * * Attempts to create all sub-sizes and returns the meta data at the end. This * may result in the server running out of resources. When it fails there may be few * "orphaned" images left over as the meta data is never returned and saved. * * As of 5.3.0 the preferred way to do this is with `make_subsize()`. It creates * the new images one at a time and allows for the meta data to be saved after * each new image is created. * * @since 3.5.0 * * @param array $sizes { * An array of image size data arrays. * * Either a height or width must be provided. * If one of the two is set to null, the resize will * maintain aspect ratio according to the source image. * * @type array ...$0 { * Array of height, width values, and whether to crop. * * @type int $width Image width. Optional if `$height` is specified. * @type int $height Image height. Optional if `$width` is specified. * @type bool|array $crop Optional. Whether to crop the image. Default false. * } * } * @return array An array of resized images' metadata by size. */ public function multi_resize( $sizes ) { $metadata = array(); foreach ( $sizes as $size => $size_data ) { $meta = $this->make_subsize( $size_data ); if ( ! is_wp_error( $meta ) ) { $metadata[ $size ] = $meta; } } return $metadata; } /** * Create an image sub-size and return the image meta data value for it. * * @since 5.3.0 * * @param array $size_data { * Array of size data. * * @type int $width The maximum width in pixels. * @type int $height The maximum height in pixels. * @type bool|array $crop Whether to crop the image to exact dimensions. * } * @return array|WP_Error The image data array for inclusion in the `sizes` array in the image meta, * WP_Error object on error. */ public function make_subsize( $size_data ) { if ( ! isset( $size_data['width'] ) && ! isset( $size_data['height'] ) ) { return new WP_Error( 'image_subsize_create_error', __( 'Cannot resize the image. Both width and height are not set.' ) ); } $orig_size = $this->size; if ( ! isset( $size_data['width'] ) ) { $size_data['width'] = null; } if ( ! isset( $size_data['height'] ) ) { $size_data['height'] = null; } if ( ! isset( $size_data['crop'] ) ) { $size_data['crop'] = false; } $resized = $this->_resize( $size_data['width'], $size_data['height'], $size_data['crop'] ); if ( is_wp_error( $resized ) ) { $saved = $resized; } else { $saved = $this->_save( $resized ); imagedestroy( $resized ); } $this->size = $orig_size; if ( ! is_wp_error( $saved ) ) { unset( $saved['path'] ); } return $saved; } /** * Crops Image. * * @since 3.5.0 * * @param int $src_x The start x position to crop from. * @param int $src_y The start y position to crop from. * @param int $src_w The width to crop. * @param int $src_h The height to crop. * @param int $dst_w Optional. The destination width. * @param int $dst_h Optional. The destination height. * @param bool $src_abs Optional. If the source crop points are absolute. * @return true|WP_Error */ public function crop( $src_x, $src_y, $src_w, $src_h, $dst_w = null, $dst_h = null, $src_abs = false ) { /* * If destination width/height isn't specified, * use same as width/height from source. */ if ( ! $dst_w ) { $dst_w = $src_w; } if ( ! $dst_h ) { $dst_h = $src_h; } foreach ( array( $src_w, $src_h, $dst_w, $dst_h ) as $value ) { if ( ! is_numeric( $value ) || (int) $value <= 0 ) { return new WP_Error( 'image_crop_error', __( 'Image crop failed.' ), $this->file ); } } $dst = wp_imagecreatetruecolor( (int) $dst_w, (int) $dst_h ); if ( $src_abs ) { $src_w -= $src_x; $src_h -= $src_y; } if ( function_exists( 'imageantialias' ) ) { imageantialias( $dst, true ); } imagecopyresampled( $dst, $this->image, 0, 0, (int) $src_x, (int) $src_y, (int) $dst_w, (int) $dst_h, (int) $src_w, (int) $src_h ); if ( is_gd_image( $dst ) ) { imagedestroy( $this->image ); $this->image = $dst; $this->update_size(); return true; } return new WP_Error( 'image_crop_error', __( 'Image crop failed.' ), $this->file ); } /** * Rotates current image counter-clockwise by $angle. * Ported from image-edit.php * * @since 3.5.0 * * @param float $angle * @return true|WP_Error */ public function rotate( $angle ) { if ( function_exists( 'imagerotate' ) ) { $transparency = imagecolorallocatealpha( $this->image, 255, 255, 255, 127 ); $rotated = imagerotate( $this->image, $angle, $transparency ); if ( is_gd_image( $rotated ) ) { imagealphablending( $rotated, true ); imagesavealpha( $rotated, true ); imagedestroy( $this->image ); $this->image = $rotated; $this->update_size(); return true; } } return new WP_Error( 'image_rotate_error', __( 'Image rotate failed.' ), $this->file ); } /** * Flips current image. * * @since 3.5.0 * * @param bool $horz Flip along Horizontal Axis. * @param bool $vert Flip along Vertical Axis. * @return true|WP_Error */ public function flip( $horz, $vert ) { $w = $this->size['width']; $h = $this->size['height']; $dst = wp_imagecreatetruecolor( $w, $h ); if ( is_gd_image( $dst ) ) { $sx = $vert ? ( $w - 1 ) : 0; $sy = $horz ? ( $h - 1 ) : 0; $sw = $vert ? -$w : $w; $sh = $horz ? -$h : $h; if ( imagecopyresampled( $dst, $this->image, 0, 0, $sx, $sy, $w, $h, $sw, $sh ) ) { imagedestroy( $this->image ); $this->image = $dst; return true; } } return new WP_Error( 'image_flip_error', __( 'Image flip failed.' ), $this->file ); } /** * Saves current in-memory image to file. * * @since 3.5.0 * @since 5.9.0 Renamed `$filename` to `$destfilename` to match parent class * for PHP 8 named parameter support. * @since 6.0.0 The `$filesize` value was added to the returned array. * * @param string|null $destfilename Optional. Destination filename. Default null. * @param string|null $mime_type Optional. The mime-type. Default null. * @return array|WP_Error { * Array on success or WP_Error if the file failed to save. * * @type string $path Path to the image file. * @type string $file Name of the image file. * @type int $width Image width. * @type int $height Image height. * @type string $mime-type The mime type of the image. * @type int $filesize File size of the image. * } */ public function save( $destfilename = null, $mime_type = null ) { $saved = $this->_save( $this->image, $destfilename, $mime_type ); if ( ! is_wp_error( $saved ) ) { $this->file = $saved['path']; $this->mime_type = $saved['mime-type']; } return $saved; } /** * @since 3.5.0 * @since 6.0.0 The `$filesize` value was added to the returned array. * * @param resource|GdImage $image * @param string|null $filename * @param string|null $mime_type * @return array|WP_Error { * Array on success or WP_Error if the file failed to save. * * @type string $path Path to the image file. * @type string $file Name of the image file. * @type int $width Image width. * @type int $height Image height. * @type string $mime-type The mime type of the image. * @type int $filesize File size of the image. * } */ protected function _save( $image, $filename = null, $mime_type = null ) { list( $filename, $extension, $mime_type ) = $this->get_output_format( $filename, $mime_type ); if ( ! $filename ) { $filename = $this->generate_filename( null, null, $extension ); } if ( function_exists( 'imageinterlace' ) ) { /** * Filters whether to output progressive images (if available). * * @since 6.5.0 * * @param bool $interlace Whether to use progressive images for output if available. Default false. * @param string $mime_type The mime type being saved. */ imageinterlace( $image, apply_filters( 'image_save_progressive', false, $mime_type ) ); } if ( 'image/gif' === $mime_type ) { if ( ! $this->make_image( $filename, 'imagegif', array( $image, $filename ) ) ) { return new WP_Error( 'image_save_error', __( 'Image Editor Save Failed' ) ); } } elseif ( 'image/png' === $mime_type ) { // Convert from full colors to index colors, like original PNG. if ( function_exists( 'imageistruecolor' ) && ! imageistruecolor( $image ) ) { imagetruecolortopalette( $image, false, imagecolorstotal( $image ) ); } if ( ! $this->make_image( $filename, 'imagepng', array( $image, $filename ) ) ) { return new WP_Error( 'image_save_error', __( 'Image Editor Save Failed' ) ); } } elseif ( 'image/jpeg' === $mime_type ) { if ( ! $this->make_image( $filename, 'imagejpeg', array( $image, $filename, $this->get_quality() ) ) ) { return new WP_Error( 'image_save_error', __( 'Image Editor Save Failed' ) ); } } elseif ( 'image/webp' === $mime_type ) { if ( ! function_exists( 'imagewebp' ) || ! $this->make_image( $filename, 'imagewebp', array( $image, $filename, $this->get_quality() ) ) ) { return new WP_Error( 'image_save_error', __( 'Image Editor Save Failed' ) ); } } elseif ( 'image/avif' === $mime_type ) { if ( ! function_exists( 'imageavif' ) || ! $this->make_image( $filename, 'imageavif', array( $image, $filename, $this->get_quality() ) ) ) { return new WP_Error( 'image_save_error', __( 'Image Editor Save Failed' ) ); } } else { return new WP_Error( 'image_save_error', __( 'Image Editor Save Failed' ) ); } // Set correct file permissions. $stat = stat( dirname( $filename ) ); $perms = $stat['mode'] & 0000666; // Same permissions as parent folder, strip off the executable bits. chmod( $filename, $perms ); return array( 'path' => $filename, /** * Filters the name of the saved image file. * * @since 2.6.0 * * @param string $filename Name of the file. */ 'file' => wp_basename( apply_filters( 'image_make_intermediate_size', $filename ) ), 'width' => $this->size['width'], 'height' => $this->size['height'], 'mime-type' => $mime_type, 'filesize' => wp_filesize( $filename ), ); } /** * Sets Image Compression quality on a 1-100% scale. Handles WebP lossless images. * * @since 6.7.0 * @since 6.8.0 The `$dims` parameter was added. * * @param int $quality Compression Quality. Range: [1,100] * @param array $dims Optional. Image dimensions array with 'width' and 'height' keys. * @return true|WP_Error True if set successfully; WP_Error on failure. */ public function set_quality( $quality = null, $dims = array() ) { $quality_result = parent::set_quality( $quality, $dims ); if ( is_wp_error( $quality_result ) ) { return $quality_result; } else { $quality = $this->get_quality(); } // Handle setting the quality for WebP lossless images, see https://php.watch/versions/8.1/gd-webp-lossless. try { if ( 'image/webp' === $this->mime_type && defined( 'IMG_WEBP_LOSSLESS' ) ) { $webp_info = wp_get_webp_info( $this->file ); if ( ! empty( $webp_info['type'] ) && 'lossless' === $webp_info['type'] ) { $quality = IMG_WEBP_LOSSLESS; parent::set_quality( $quality, $dims ); } } } catch ( Exception $e ) { return new WP_Error( 'image_quality_error', $e->getMessage() ); } $this->quality = $quality; return true; } /** * Returns stream of current image. * * @since 3.5.0 * * @param string $mime_type The mime type of the image. * @return bool True on success, false on failure. */ public function stream( $mime_type = null ) { list( $filename, $extension, $mime_type ) = $this->get_output_format( null, $mime_type ); switch ( $mime_type ) { case 'image/png': header( 'Content-Type: image/png' ); return imagepng( $this->image ); case 'image/gif': header( 'Content-Type: image/gif' ); return imagegif( $this->image ); case 'image/webp': if ( function_exists( 'imagewebp' ) ) { header( 'Content-Type: image/webp' ); return imagewebp( $this->image, null, $this->get_quality() ); } else { // Fall back to JPEG. header( 'Content-Type: image/jpeg' ); return imagejpeg( $this->image, null, $this->get_quality() ); } case 'image/avif': if ( function_exists( 'imageavif' ) ) { header( 'Content-Type: image/avif' ); return imageavif( $this->image, null, $this->get_quality() ); } // Fall back to JPEG. default: header( 'Content-Type: image/jpeg' ); return imagejpeg( $this->image, null, $this->get_quality() ); } } /** * Either calls editor's save function or handles file as a stream. * * @since 3.5.0 * * @param string $filename * @param callable $callback * @param array $arguments * @return bool */ protected function make_image( $filename, $callback, $arguments ) { if ( wp_is_stream( $filename ) ) { $arguments[1] = null; } return parent::make_image( $filename, $callback, $arguments ); } }

تفاعل

“الروبوتات في صراع الوجود: هل نهدد مستقبلنا بأيدينا؟”

مايو 24, 2025

1٬723 دقيقة واحدة

كتبت مريم سمير

في عصر التكنولوجيا الحديثة، ظهرت الروبوتات وكان صنعها قليل ومحدود ، ومن ثم بدأ الموضوع في الانتشار ، وأصبحت الدول الأوروبية هم الأكثر استخداما للروبوتات، بالطبع ان التكنولوجيا تمدنا بالأشياء النافعة لكن لكل شيء يوجد مخاطر وتحديات ، في هذا التحقيق سنعرض هذه الظاهرة ونتناول تأثيرها علي مستقبلنا ، لنفهم كيف يمكننا التصدي لهذه التحديات .

كشفت صحيفة ديلي ميل البريطانية عام 2023 ان احد روبوتات شركة تسلا قام بمهاجمة مهندس داخل المصنع بولاية تكساس الامريكية حيث استطاع الروبوت تثبيت الرجل ثم غرس مخالبه المعدنية في ظهره وذراعه تاركا سيلا من الدماء علي أرضية المصنع .

والسؤال الان الي أي مدي يمكن ان يتكرر هذا العطل ؟

وضح” د/ احمد سعيد “، معيد في كلية حاسبات ومعلومات ، ان هناك العديد من حالات تعدي الروبوتات علي البشر ، وقال ان هناك تقارير عن استخدام الروبوتات العسكرية في النزاعات ، مما ادي الي وقوع إصابات بشرية ، وأضاف ان الأسباب المحتملة تشتمل أخطاء في البرمجة ، وعدم وجود معايير صارمة في تصميم الروبوتات، كما أشار الي ان الروبوتات قد تتصرف بشكل غير متوقع اذا تعرضت لأحداث غير متوقعة او ظروف غير عادية .

كما تحدثت “المهندسة سارة يوسف” ، مبرمجة في شركة تكنولوجيا ، ان الأخطاء البرمجية مثل عدم معالجة الاستثناءات بشكل صحيح او وجود ثغرات في تعليمات التحكم يمكن ان تؤدي الي تصرفات عدوانية ، هذه الأخطاء تجعل الروبوتات تتجاهل أوامر السلامة .

وأشار المهندس ” كريم حسن ” ، خريج كلية حاسبات ومعلومات ويعمل في مجال البرمجة ، الي ان هناك عدة تدابير امنية يمكن اتخاذها ، مثل تطوير بروتوكولات امان صارمة ، واستخدام أجهزة استشعار لتقليل التفاعل غير المرغوب فيه مع البشر ، وتطبيق تقنيات التعلم الالي لتحسين سلوك الروبوتات .

كما اخبرتنا المحامية “نجلاء عبد الرحمن ” ، ان القوانين الحالية لا تغطي بشكل كافي اعتداءات الروبوتات ، وأكدت ان هناك حاجة ملحة لتطوير تشريعات جديدة تركز علي حقوق الافراد و تحدد مسؤليات الشركات المصنعة .

ومع استمرار تقدم التكنولوجيا، يبقى التحدي الأكبر هو ضمان أن تكون هذه الآلات أدوات لخدمة البشرية، وليس تهديدًا لها. من خلال العمل الجاد والالتزام بالمعايير العالية، يمكننا بناء مستقبل آمن ومشرق حيث تتعايش الروبوتات والبشر بسلام.

مايو 24, 2025

1٬723 دقيقة واحدة