1 | <?php |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * GD2 toolkit for image manipulation within Drupal. |
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6 | */ |
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7 | |
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8 | /** |
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9 | * @ingroup image |
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10 | * @{ |
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11 | */ |
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12 | |
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13 | /** |
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14 | * Retrieve information about the toolkit. |
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15 | */ |
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16 | function image_gd_info() { |
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17 | return array('name' => 'gd', 'title' => t('GD2 image manipulation toolkit')); |
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18 | } |
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19 | |
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20 | /** |
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21 | * Retrieve settings for the GD2 toolkit. |
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22 | */ |
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23 | function image_gd_settings() { |
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24 | if (image_gd_check_settings()) { |
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25 | $form = array(); |
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26 | $form['status'] = array( |
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27 | '#value' => t('The GD toolkit is installed and working properly.') |
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28 | ); |
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29 | |
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30 | $form['image_jpeg_quality'] = array( |
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31 | '#type' => 'textfield', |
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32 | '#title' => t('JPEG quality'), |
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33 | '#description' => t('Define the image quality for JPEG manipulations. Ranges from 0 to 100. Higher values mean better image quality but bigger files.'), |
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34 | '#size' => 10, |
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35 | '#maxlength' => 3, |
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36 | '#default_value' => variable_get('image_jpeg_quality', 75), |
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37 | '#field_suffix' => t('%'), |
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38 | ); |
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39 | $form['#element_validate'] = array('image_gd_settings_validate'); |
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40 | |
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41 | return $form; |
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42 | } |
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43 | else { |
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44 | form_set_error('image_toolkit', t('The GD image toolkit requires that the GD module for PHP be installed and configured properly. For more information see <a href="@url">PHP\'s image documentation</a>.', array('@url' => 'http://php.net/image'))); |
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45 | return FALSE; |
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46 | } |
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47 | } |
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48 | |
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49 | /** |
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50 | * Validate the submitted GD settings. |
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51 | */ |
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52 | function image_gd_settings_validate($form, &$form_state) { |
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53 | // Validate image quality range. |
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54 | $value = $form_state['values']['image_jpeg_quality']; |
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55 | if (!is_numeric($value) || $value < 0 || $value > 100) { |
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56 | form_set_error('image_jpeg_quality', t('JPEG quality must be a number between 0 and 100.')); |
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57 | } |
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58 | } |
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59 | |
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60 | /** |
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61 | * Verify GD2 settings (that the right version is actually installed). |
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62 | * |
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63 | * @return |
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64 | * A boolean indicating if the GD toolkit is avaiable on this machine. |
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65 | */ |
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66 | function image_gd_check_settings() { |
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67 | if ($check = get_extension_funcs('gd')) { |
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68 | if (in_array('imagegd2', $check)) { |
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69 | // GD2 support is available. |
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70 | return TRUE; |
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71 | } |
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72 | } |
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73 | return FALSE; |
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74 | } |
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75 | |
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76 | /** |
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77 | * Scale an image to the specified size using GD. |
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78 | */ |
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79 | function image_gd_resize($source, $destination, $width, $height) { |
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80 | if (!file_exists($source)) { |
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81 | return FALSE; |
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82 | } |
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83 | |
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84 | $info = image_get_info($source); |
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85 | if (!$info) { |
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86 | return FALSE; |
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87 | } |
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88 | |
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89 | $im = image_gd_open($source, $info['extension']); |
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90 | if (!$im) { |
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91 | return FALSE; |
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92 | } |
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93 | |
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94 | $res = imagecreatetruecolor($width, $height); |
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95 | if ($info['extension'] == 'png') { |
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96 | $transparency = imagecolorallocatealpha($res, 0, 0, 0, 127); |
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97 | imagealphablending($res, FALSE); |
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98 | imagefilledrectangle($res, 0, 0, $width, $height, $transparency); |
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99 | imagealphablending($res, TRUE); |
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100 | imagesavealpha($res, TRUE); |
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101 | } |
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102 | elseif ($info['extension'] == 'gif') { |
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103 | // If we have a specific transparent color. |
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104 | $transparency_index = imagecolortransparent($im); |
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105 | if ($transparency_index >= 0) { |
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106 | // Get the original image's transparent color's RGB values. |
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107 | $transparent_color = imagecolorsforindex($im, $transparency_index); |
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108 | // Allocate the same color in the new image resource. |
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109 | $transparency_index = imagecolorallocate($res, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']); |
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110 | // Completely fill the background of the new image with allocated color. |
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111 | imagefill($res, 0, 0, $transparency_index); |
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112 | // Set the background color for new image to transparent. |
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113 | imagecolortransparent($res, $transparency_index); |
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114 | // Find number of colors in the images palette. |
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115 | $number_colors = imagecolorstotal($im); |
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116 | // Convert from true color to palette to fix transparency issues. |
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117 | imagetruecolortopalette($res, TRUE, $number_colors); |
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118 | } |
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119 | } |
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120 | imagecopyresampled($res, $im, 0, 0, 0, 0, $width, $height, $info['width'], $info['height']); |
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121 | $result = image_gd_close($res, $destination, $info['extension']); |
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122 | |
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123 | imagedestroy($res); |
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124 | imagedestroy($im); |
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125 | |
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126 | return $result; |
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127 | } |
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128 | |
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129 | /** |
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130 | * Rotate an image the given number of degrees. |
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131 | */ |
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132 | function image_gd_rotate($source, $destination, $degrees, $background = 0x000000) { |
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133 | if (!function_exists('imageRotate')) { |
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134 | return FALSE; |
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135 | } |
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136 | |
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137 | $info = image_get_info($source); |
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138 | if (!$info) { |
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139 | return FALSE; |
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140 | } |
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141 | |
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142 | $im = image_gd_open($source, $info['extension']); |
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143 | if (!$im) { |
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144 | return FALSE; |
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145 | } |
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146 | |
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147 | $res = imageRotate($im, $degrees, $background); |
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148 | $result = image_gd_close($res, $destination, $info['extension']); |
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149 | |
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150 | return $result; |
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151 | } |
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152 | |
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153 | /** |
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154 | * Crop an image using the GD toolkit. |
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155 | */ |
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156 | function image_gd_crop($source, $destination, $x, $y, $width, $height) { |
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157 | $info = image_get_info($source); |
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158 | if (!$info) { |
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159 | return FALSE; |
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160 | } |
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161 | |
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162 | $im = image_gd_open($source, $info['extension']); |
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163 | $res = imageCreateTrueColor($width, $height); |
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164 | imageCopy($res, $im, 0, 0, $x, $y, $width, $height); |
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165 | $result = image_gd_close($res, $destination, $info['extension']); |
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166 | |
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167 | imageDestroy($res); |
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168 | imageDestroy($im); |
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169 | |
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170 | return $result; |
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171 | } |
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172 | |
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173 | /** |
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174 | * GD helper function to create an image resource from a file. |
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175 | * |
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176 | * @param $file |
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177 | * A string file path where the iamge should be saved. |
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178 | * @param $extension |
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179 | * A string containing one of the following extensions: gif, jpg, jpeg, png. |
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180 | * @return |
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181 | * An image resource, or FALSE on error. |
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182 | */ |
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183 | function image_gd_open($file, $extension) { |
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184 | $extension = str_replace('jpg', 'jpeg', $extension); |
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185 | $open_func = 'imageCreateFrom'. $extension; |
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186 | if (!function_exists($open_func)) { |
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187 | return FALSE; |
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188 | } |
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189 | return $open_func($file); |
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190 | } |
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191 | |
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192 | /** |
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193 | * GD helper to write an image resource to a destination file. |
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194 | * |
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195 | * @param $res |
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196 | * An image resource created with image_gd_open(). |
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197 | * @param $destination |
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198 | * A string file path where the iamge should be saved. |
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199 | * @param $extension |
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200 | * A string containing one of the following extensions: gif, jpg, jpeg, png. |
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201 | * @return |
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202 | * Boolean indicating success. |
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203 | */ |
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204 | function image_gd_close($res, $destination, $extension) { |
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205 | $extension = str_replace('jpg', 'jpeg', $extension); |
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206 | $close_func = 'image'. $extension; |
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207 | if (!function_exists($close_func)) { |
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208 | return FALSE; |
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209 | } |
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210 | if ($extension == 'jpeg') { |
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211 | return $close_func($res, $destination, variable_get('image_jpeg_quality', 75)); |
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212 | } |
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213 | else { |
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214 | return $close_func($res, $destination); |
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215 | } |
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216 | } |
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217 | |
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218 | /** |
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219 | * @} End of "ingroup image". |
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220 | */ |
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