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1 <?php |
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2 /** |
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3 * File contains all the administration image manipulation functions. |
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4 * |
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5 * @package WordPress |
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6 * @subpackage Administration |
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7 */ |
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8 |
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9 /** |
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10 * Create a thumbnail from an Image given a maximum side size. |
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11 * |
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12 * This function can handle most image file formats which PHP supports. If PHP |
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13 * does not have the functionality to save in a file of the same format, the |
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14 * thumbnail will be created as a jpeg. |
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15 * |
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16 * @since 1.2.0 |
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17 * |
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18 * @param mixed $file Filename of the original image, Or attachment id. |
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19 * @param int $max_side Maximum length of a single side for the thumbnail. |
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20 * @return string Thumbnail path on success, Error string on failure. |
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21 */ |
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22 function wp_create_thumbnail( $file, $max_side, $deprecated = '' ) { |
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23 $thumbpath = image_resize( $file, $max_side, $max_side ); |
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24 return apply_filters( 'wp_create_thumbnail', $thumbpath ); |
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25 } |
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26 |
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27 /** |
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28 * Crop an Image to a given size. |
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29 * |
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30 * @since 2.1.0 |
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31 * |
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32 * @param string|int $src_file The source file or Attachment ID. |
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33 * @param int $src_x The start x position to crop from. |
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34 * @param int $src_y The start y position to crop from. |
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35 * @param int $src_w The width to crop. |
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36 * @param int $src_h The height to crop. |
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37 * @param int $dst_w The destination width. |
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38 * @param int $dst_h The destination height. |
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39 * @param int $src_abs Optional. If the source crop points are absolute. |
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40 * @param string $dst_file Optional. The destination file to write to. |
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41 * @return string New filepath on success, String error message on failure. |
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42 */ |
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43 function wp_crop_image( $src_file, $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs = false, $dst_file = false ) { |
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44 if ( is_numeric( $src_file ) ) // Handle int as attachment ID |
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45 $src_file = get_attached_file( $src_file ); |
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46 |
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47 $src = wp_load_image( $src_file ); |
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48 |
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49 if ( !is_resource( $src )) |
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50 return $src; |
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51 |
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52 $dst = imagecreatetruecolor( $dst_w, $dst_h ); |
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53 |
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54 if ( $src_abs ) { |
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55 $src_w -= $src_x; |
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56 $src_h -= $src_y; |
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57 } |
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58 |
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59 if (function_exists('imageantialias')) |
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60 imageantialias( $dst, true ); |
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61 |
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62 imagecopyresampled( $dst, $src, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h ); |
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63 |
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64 imagedestroy( $src ); // Free up memory |
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65 |
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66 if ( ! $dst_file ) |
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67 $dst_file = str_replace( basename( $src_file ), 'cropped-' . basename( $src_file ), $src_file ); |
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68 |
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69 $dst_file = preg_replace( '/\\.[^\\.]+$/', '.jpg', $dst_file ); |
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70 |
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71 if ( imagejpeg( $dst, $dst_file, apply_filters( 'jpeg_quality', 90, 'wp_crop_image' ) ) ) |
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72 return $dst_file; |
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73 else |
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74 return false; |
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75 } |
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76 |
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77 /** |
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78 * Generate post image attachment meta data. |
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79 * |
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80 * @since 2.1.0 |
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81 * |
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82 * @param int $attachment_id Attachment Id to process. |
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83 * @param string $file Filepath of the Attached image. |
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84 * @return mixed Metadata for attachment. |
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85 */ |
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86 function wp_generate_attachment_metadata( $attachment_id, $file ) { |
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87 $attachment = get_post( $attachment_id ); |
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88 |
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89 $metadata = array(); |
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90 if ( preg_match('!^image/!', get_post_mime_type( $attachment )) && file_is_displayable_image($file) ) { |
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91 $full_path_file = $file; |
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92 $imagesize = getimagesize( $full_path_file ); |
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93 $metadata['width'] = $imagesize[0]; |
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94 $metadata['height'] = $imagesize[1]; |
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95 list($uwidth, $uheight) = wp_shrink_dimensions($metadata['width'], $metadata['height']); |
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96 $metadata['hwstring_small'] = "height='$uheight' width='$uwidth'"; |
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97 |
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98 // Make the file path relative to the upload dir |
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99 if ( ($uploads = wp_upload_dir()) && false === $uploads['error'] ) { // Get upload directory |
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100 if ( 0 === strpos($file, $uploads['basedir']) ) {// Check that the upload base exists in the file path |
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101 $file = str_replace($uploads['basedir'], '', $file); // Remove upload dir from the file path |
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102 $file = ltrim($file, '/'); |
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103 } |
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104 } |
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105 $metadata['file'] = $file; |
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106 |
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107 // make thumbnails and other intermediate sizes |
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108 $sizes = array('thumbnail', 'medium', 'large'); |
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109 $sizes = apply_filters('intermediate_image_sizes', $sizes); |
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110 |
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111 foreach ($sizes as $size) { |
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112 $resized = image_make_intermediate_size( $full_path_file, get_option("{$size}_size_w"), get_option("{$size}_size_h"), get_option("{$size}_crop") ); |
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113 if ( $resized ) |
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114 $metadata['sizes'][$size] = $resized; |
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115 } |
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116 |
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117 // fetch additional metadata from exif/iptc |
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118 $image_meta = wp_read_image_metadata( $full_path_file ); |
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119 if ($image_meta) |
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120 $metadata['image_meta'] = $image_meta; |
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121 |
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122 } |
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123 |
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124 return apply_filters( 'wp_generate_attachment_metadata', $metadata ); |
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125 } |
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126 |
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127 /** |
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128 * Load an image from a string, if PHP supports it. |
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129 * |
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130 * @since 2.1.0 |
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131 * |
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132 * @param string $file Filename of the image to load. |
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133 * @return resource The resulting image resource on success, Error string on failure. |
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134 */ |
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135 function wp_load_image( $file ) { |
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136 if ( is_numeric( $file ) ) |
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137 $file = get_attached_file( $file ); |
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138 |
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139 if ( ! file_exists( $file ) ) |
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140 return sprintf(__('File “%s” doesn’t exist?'), $file); |
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141 |
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142 if ( ! function_exists('imagecreatefromstring') ) |
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143 return __('The GD image library is not installed.'); |
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144 |
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145 // Set artificially high because GD uses uncompressed images in memory |
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146 @ini_set('memory_limit', '256M'); |
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147 $image = imagecreatefromstring( file_get_contents( $file ) ); |
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148 |
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149 if ( !is_resource( $image ) ) |
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150 return sprintf(__('File “%s” is not an image.'), $file); |
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151 |
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152 return $image; |
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153 } |
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154 |
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155 /** |
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156 * Calculated the new dimentions for a downsampled image. |
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157 * |
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158 * @since 2.0.0 |
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159 * @see wp_shrink_dimensions() |
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160 * |
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161 * @param int $width Current width of the image |
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162 * @param int $height Current height of the image |
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163 * @return mixed Array(height,width) of shrunk dimensions. |
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164 */ |
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165 function get_udims( $width, $height) { |
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166 return wp_shrink_dimensions( $width, $height ); |
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167 } |
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168 |
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169 /** |
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170 * Calculates the new dimentions for a downsampled image. |
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171 * |
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172 * @since 2.0.0 |
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173 * @see wp_constrain_dimensions() |
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174 * |
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175 * @param int $width Current width of the image |
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176 * @param int $height Current height of the image |
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177 * @param int $wmax Maximum wanted width |
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178 * @param int $hmax Maximum wanted height |
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179 * @return mixed Array(height,width) of shrunk dimensions. |
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180 */ |
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181 function wp_shrink_dimensions( $width, $height, $wmax = 128, $hmax = 96 ) { |
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182 return wp_constrain_dimensions( $width, $height, $wmax, $hmax ); |
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183 } |
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184 |
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185 /** |
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186 * Convert a fraction string to a decimal. |
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187 * |
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188 * @since 2.5.0 |
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189 * |
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190 * @param string $str |
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191 * @return int|float |
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192 */ |
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193 function wp_exif_frac2dec($str) { |
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194 @list( $n, $d ) = explode( '/', $str ); |
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195 if ( !empty($d) ) |
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196 return $n / $d; |
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197 return $str; |
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198 } |
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199 |
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200 /** |
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201 * Convert the exif date format to a unix timestamp. |
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202 * |
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203 * @since 2.5.0 |
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204 * |
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205 * @param string $str |
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206 * @return int |
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207 */ |
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208 function wp_exif_date2ts($str) { |
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209 @list( $date, $time ) = explode( ' ', trim($str) ); |
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210 @list( $y, $m, $d ) = explode( ':', $date ); |
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211 |
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212 return strtotime( "{$y}-{$m}-{$d} {$time}" ); |
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213 } |
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214 |
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215 /** |
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216 * Get extended image metadata, exif or iptc as available. |
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217 * |
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218 * Retrieves the EXIF metadata aperture, credit, camera, caption, copyright, iso |
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219 * created_timestamp, focal_length, shutter_speed, and title. |
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220 * |
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221 * The IPTC metadata that is retrieved is APP13, credit, byline, created date |
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222 * and time, caption, copyright, and title. Also includes FNumber, Model, |
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223 * DateTimeDigitized, FocalLength, ISOSpeedRatings, and ExposureTime. |
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224 * |
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225 * @todo Try other exif libraries if available. |
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226 * @since 2.5.0 |
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227 * |
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228 * @param string $file |
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229 * @return bool|array False on failure. Image metadata array on success. |
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230 */ |
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231 function wp_read_image_metadata( $file ) { |
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232 if ( !file_exists( $file ) ) |
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233 return false; |
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234 |
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235 list(,,$sourceImageType) = getimagesize( $file ); |
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236 |
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237 // exif contains a bunch of data we'll probably never need formatted in ways |
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238 // that are difficult to use. We'll normalize it and just extract the fields |
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239 // that are likely to be useful. Fractions and numbers are converted to |
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240 // floats, dates to unix timestamps, and everything else to strings. |
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241 $meta = array( |
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242 'aperture' => 0, |
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243 'credit' => '', |
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244 'camera' => '', |
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245 'caption' => '', |
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246 'created_timestamp' => 0, |
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247 'copyright' => '', |
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248 'focal_length' => 0, |
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249 'iso' => 0, |
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250 'shutter_speed' => 0, |
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251 'title' => '', |
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252 ); |
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253 |
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254 // read iptc first, since it might contain data not available in exif such |
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255 // as caption, description etc |
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256 if ( is_callable('iptcparse') ) { |
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257 getimagesize($file, $info); |
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258 if ( !empty($info['APP13']) ) { |
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259 $iptc = iptcparse($info['APP13']); |
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260 if ( !empty($iptc['2#110'][0]) ) // credit |
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261 $meta['credit'] = utf8_encode(trim($iptc['2#110'][0])); |
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262 elseif ( !empty($iptc['2#080'][0]) ) // byline |
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263 $meta['credit'] = utf8_encode(trim($iptc['2#080'][0])); |
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264 if ( !empty($iptc['2#055'][0]) and !empty($iptc['2#060'][0]) ) // created date and time |
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265 $meta['created_timestamp'] = strtotime($iptc['2#055'][0] . ' ' . $iptc['2#060'][0]); |
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266 if ( !empty($iptc['2#120'][0]) ) // caption |
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267 $meta['caption'] = utf8_encode(trim($iptc['2#120'][0])); |
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268 if ( !empty($iptc['2#116'][0]) ) // copyright |
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269 $meta['copyright'] = utf8_encode(trim($iptc['2#116'][0])); |
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270 if ( !empty($iptc['2#005'][0]) ) // title |
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271 $meta['title'] = utf8_encode(trim($iptc['2#005'][0])); |
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272 } |
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273 } |
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274 |
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275 // fetch additional info from exif if available |
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276 if ( is_callable('exif_read_data') && in_array($sourceImageType, apply_filters('wp_read_image_metadata_types', array(IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM)) ) ) { |
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277 $exif = @exif_read_data( $file ); |
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278 if (!empty($exif['FNumber'])) |
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279 $meta['aperture'] = round( wp_exif_frac2dec( $exif['FNumber'] ), 2 ); |
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280 if (!empty($exif['Model'])) |
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281 $meta['camera'] = trim( $exif['Model'] ); |
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282 if (!empty($exif['DateTimeDigitized'])) |
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283 $meta['created_timestamp'] = wp_exif_date2ts($exif['DateTimeDigitized']); |
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284 if (!empty($exif['FocalLength'])) |
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285 $meta['focal_length'] = wp_exif_frac2dec( $exif['FocalLength'] ); |
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286 if (!empty($exif['ISOSpeedRatings'])) |
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287 $meta['iso'] = $exif['ISOSpeedRatings']; |
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288 if (!empty($exif['ExposureTime'])) |
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289 $meta['shutter_speed'] = wp_exif_frac2dec( $exif['ExposureTime'] ); |
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290 } |
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291 |
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292 return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType ); |
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293 |
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294 } |
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295 |
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296 /** |
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297 * Validate that file is an image. |
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298 * |
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299 * @since 2.5.0 |
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300 * |
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301 * @param string $path File path to test if valid image. |
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302 * @return bool True if valid image, false if not valid image. |
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303 */ |
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304 function file_is_valid_image($path) { |
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305 $size = @getimagesize($path); |
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306 return !empty($size); |
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307 } |
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308 |
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309 /** |
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310 * Validate that file is suitable for displaying within a web page. |
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311 * |
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312 * @since 2.5.0 |
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313 * @uses apply_filters() Calls 'file_is_displayable_image' on $result and $path. |
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314 * |
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315 * @param string $path File path to test. |
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316 * @return bool True if suitable, false if not suitable. |
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317 */ |
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318 function file_is_displayable_image($path) { |
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319 $info = @getimagesize($path); |
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320 if ( empty($info) ) |
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321 $result = false; |
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322 elseif ( !in_array($info[2], array(IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG)) ) // only gif, jpeg and png images can reliably be displayed |
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323 $result = false; |
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324 else |
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325 $result = true; |
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326 |
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327 return apply_filters('file_is_displayable_image', $result, $path); |
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328 } |
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329 |
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330 ?> |