| 1 |
<?php |
| 2 |
/** |
| 3 |
* WaterMark Handler Class |
| 4 |
* |
| 5 |
* Handles all watermark related operations with improved organization and caching |
| 6 |
*/ |
| 7 |
class WaterMarkHandler { |
| 8 |
/** @var string */ |
| 9 |
private $cache_dir; |
| 10 |
|
| 11 |
/** @var string */ |
| 12 |
private $font_dir; |
| 13 |
|
| 14 |
/** @var array */ |
| 15 |
private $options; |
| 16 |
|
| 17 |
/** |
| 18 |
* 支持添加水印的 MIME 类型 |
| 19 |
* |
| 20 |
* @return string[] |
| 21 |
*/ |
| 22 |
public static function getSupportedMimeTypes(): array { |
| 23 |
$mimes = ['image/jpeg', 'image/png', 'image/gif']; |
| 24 |
if (function_exists('imagecreatefromwebp') && function_exists('imagewebp')) { |
| 25 |
$mimes[] = 'image/webp'; |
| 26 |
} |
| 27 |
return $mimes; |
| 28 |
} |
| 29 |
|
| 30 |
/** |
| 31 |
* 支持添加水印的扩展名（不带点） |
| 32 |
* |
| 33 |
* @return string[] |
| 34 |
*/ |
| 35 |
public static function getSupportedExtensions(): array { |
| 36 |
$extensions = ['jpg', 'jpeg', 'png', 'gif']; |
| 37 |
if (function_exists('imagecreatefromwebp') && function_exists('imagewebp')) { |
| 38 |
$extensions[] = 'webp'; |
| 39 |
} |
| 40 |
return $extensions; |
| 41 |
} |
| 42 |
|
| 43 |
/** |
| 44 |
* Constructor |
| 45 |
* |
| 46 |
* @param array $options Watermark options |
| 47 |
*/ |
| 48 |
public function __construct(array $options) { |
| 49 |
$this->options = $options; |
| 50 |
$this->cache_dir = plugin_dir_path(__FILE__) . 'cache/'; |
| 51 |
$this->font_dir = plugin_dir_path(__FILE__) . 'fonts/'; |
| 52 |
|
| 53 |
// 缓存默认� |
| 54 |
�闭，不再自动创建缓存目录 |
| 55 |
if ($this->isCacheEnabled() && !file_exists($this->cache_dir)) { |
| 56 |
wp_mkdir_p($this->cache_dir); |
| 57 |
} |
| 58 |
} |
| 59 |
|
| 60 |
/** |
| 61 |
* Generate cache key for watermark options |
| 62 |
* |
| 63 |
* @param string $img_url |
| 64 |
* @param array $options |
| 65 |
* @return string |
| 66 |
*/ |
| 67 |
private function generateCacheKey(string $img_url, array $options): string { |
| 68 |
return md5($img_url . serialize($options)); |
| 69 |
} |
| 70 |
|
| 71 |
/** |
| 72 |
* 是否启用水印缓存（默认� |
| 73 |
�闭，避� |
| 74 |
�长期占用磁盘） |
| 75 |
*/ |
| 76 |
private function isCacheEnabled(): bool { |
| 77 |
return false; |
| 78 |
} |
| 79 |
|
| 80 |
/** |
| 81 |
* 九宫格位置键名列表（与 calculatePosition 的 case 一致） |
| 82 |
* |
| 83 |
* @return string[] |
| 84 |
*/ |
| 85 |
private static function getGridPositionKeys(): array { |
| 86 |
return [ |
| 87 |
'top-left', 'top-center', 'top-right', |
| 88 |
'middle-left', 'middle-center', 'middle-right', |
| 89 |
'bottom-left', 'bottom-center', 'bottom-right', |
| 90 |
]; |
| 91 |
} |
| 92 |
|
| 93 |
/** |
| 94 |
* 若设置为 random，则每次处理在九宫格中随机选一格 |
| 95 |
*/ |
| 96 |
private function resolveGridPosition(string $position): string { |
| 97 |
if ($position === 'random') { |
| 98 |
$grid = self::getGridPositionKeys(); |
| 99 |
return $grid[wp_rand(0, count($grid) - 1)]; |
| 100 |
} |
| 101 |
return $position; |
| 102 |
} |
| 103 |
|
| 104 |
/** |
| 105 |
* 从本次调用的 options 与默认� |
| 106 |
�置得到原始位置字符串（可能为 random） |
| 107 |
*/ |
| 108 |
private function getRawWatermarkPosition(array $options): string { |
| 109 |
if (isset($options['watermark_position']) && $options['watermark_position'] !== '') { |
| 110 |
return (string) $options['watermark_position']; |
| 111 |
} |
| 112 |
if (isset($options['position']) && $options['position'] !== '') { |
| 113 |
return (string) $options['position']; |
| 114 |
} |
| 115 |
return (string) $this->options['watermark_position']; |
| 116 |
} |
| 117 |
|
| 118 |
/** |
| 119 |
* Check if cached version exists |
| 120 |
* |
| 121 |
* @param string $cache_key |
| 122 |
* @return string|false |
| 123 |
*/ |
| 124 |
private function getCachedImage(string $cache_key) { |
| 125 |
$cache_extensions = ['jpg', 'png', 'gif', 'webp']; |
| 126 |
foreach ($cache_extensions as $ext) { |
| 127 |
$cache_file = $this->cache_dir . $cache_key . '.' . $ext; |
| 128 |
if (file_exists($cache_file) && (time() - filemtime($cache_file) < 3600)) { |
| 129 |
return $cache_file; |
| 130 |
} |
| 131 |
} |
| 132 |
return false; |
| 133 |
} |
| 134 |
|
| 135 |
/** |
| 136 |
* Create text watermark with improved error handling and caching |
| 137 |
* |
| 138 |
* @param string $img_url |
| 139 |
* @param string $new_img_url |
| 140 |
* @param string $text |
| 141 |
* @param array $options |
| 142 |
* @return bool |
| 143 |
*/ |
| 144 |
public function createTextWatermark(string $img_url, string $new_img_url, string $text, array $options = []): bool { |
| 145 |
try { |
| 146 |
$merged = array_merge($this->options, $options); |
| 147 |
$raw_position = $this->getRawWatermarkPosition($options); |
| 148 |
$use_cache = ($raw_position !== 'random') && $this->isCacheEnabled(); |
| 149 |
|
| 150 |
if ($use_cache) { |
| 151 |
$cache_key = $this->generateCacheKey($img_url, $merged); |
| 152 |
$cached_file = $this->getCachedImage($cache_key); |
| 153 |
if ($cached_file) { |
| 154 |
copy($cached_file, $new_img_url); |
| 155 |
return true; |
| 156 |
} |
| 157 |
} |
| 158 |
|
| 159 |
// Validate image |
| 160 |
$img_size = getimagesize($img_url); |
| 161 |
if (empty($img_size)) { |
| 162 |
throw new Exception('Invalid image file'); |
| 163 |
} |
| 164 |
|
| 165 |
// Validate dimensions |
| 166 |
if ($img_size[0] < $this->options['watermark_min_width'] || |
| 167 |
$img_size[1] < $this->options['watermark_min_height']) { |
| 168 |
throw new Exception('Image dimensions too small for watermark'); |
| 169 |
} |
| 170 |
|
| 171 |
// Create image resource |
| 172 |
$im = $this->createImageResource($img_url, $img_size['mime']); |
| 173 |
if (!$im) { |
| 174 |
throw new Exception('Failed to create image resource'); |
| 175 |
} |
| 176 |
|
| 177 |
// Apply text watermark |
| 178 |
$text_color = $this->parseColor($options['text_color'] ?? $this->options['text_color']); |
| 179 |
$font_file = $this->font_dir . ($options['text_font'] ?? $this->options['text_font']); |
| 180 |
|
| 181 |
if (!file_exists($font_file)) { |
| 182 |
throw new Exception('Font file not found'); |
| 183 |
} |
| 184 |
|
| 185 |
$opacity = intval($options['watermark_diaphaneity'] ?? $this->options['watermark_diaphaneity']); |
| 186 |
$opacity = min(100, max(0, $opacity)); |
| 187 |
$font_size = intval($options['text_size'] ?? $this->options['text_size']); |
| 188 |
$font_angle = intval($options['text_angle'] ?? $this->options['text_angle']); |
| 189 |
|
| 190 |
$position = $this->calculatePosition( |
| 191 |
$this->resolveGridPosition($raw_position), |
| 192 |
$img_size[0], |
| 193 |
$img_size[1], |
| 194 |
$text, |
| 195 |
0, |
| 196 |
0, |
| 197 |
$font_size, |
| 198 |
$font_angle, |
| 199 |
$font_file |
| 200 |
); |
| 201 |
|
| 202 |
$this->renderTextLayer( |
| 203 |
$im, |
| 204 |
$img_size[0], |
| 205 |
$img_size[1], |
| 206 |
$text, |
| 207 |
$font_file, |
| 208 |
$font_size, |
| 209 |
$font_angle, |
| 210 |
$position['x'], |
| 211 |
$position['y'], |
| 212 |
$text_color, |
| 213 |
$opacity |
| 214 |
); |
| 215 |
|
| 216 |
if ($img_size['mime'] === 'image/png' || $img_size['mime'] === 'image/webp') { |
| 217 |
imagealphablending($im, false); |
| 218 |
imagesavealpha($im, true); |
| 219 |
} |
| 220 |
|
| 221 |
// Save image |
| 222 |
$this->saveImage($im, $new_img_url, $img_size['mime']); |
| 223 |
|
| 224 |
// Cache result（随机位置不使用缓存，避� |
| 225 |
�多次上传被同一随机结果锁死） |
| 226 |
if ($use_cache) { |
| 227 |
$cache_ext = 'jpg'; |
| 228 |
if ($img_size['mime'] === 'image/png') { |
| 229 |
$cache_ext = 'png'; |
| 230 |
} elseif ($img_size['mime'] === 'image/gif') { |
| 231 |
$cache_ext = 'gif'; |
| 232 |
} elseif ($img_size['mime'] === 'image/webp') { |
| 233 |
$cache_ext = 'webp'; |
| 234 |
} |
| 235 |
copy($new_img_url, $this->cache_dir . $cache_key . '.' . $cache_ext); |
| 236 |
} |
| 237 |
|
| 238 |
imagedestroy($im); |
| 239 |
return true; |
| 240 |
|
| 241 |
} catch (Exception $e) { |
| 242 |
error_log('WaterMark Error: ' . $e->getMessage()); |
| 243 |
return false; |
| 244 |
} |
| 245 |
} |
| 246 |
|
| 247 |
/** |
| 248 |
* Create image watermark with improved error handling and caching |
| 249 |
* |
| 250 |
* @param string $img_url |
| 251 |
* @param string $watermark_url |
| 252 |
* @param string $new_img_url |
| 253 |
* @param array $options |
| 254 |
* @return bool |
| 255 |
*/ |
| 256 |
public function createImageWatermark($img_url, $watermark_url, $new_img_url, $options = []) { |
| 257 |
try { |
| 258 |
$merged = array_merge($this->options, $options); |
| 259 |
$raw_position = $this->getRawWatermarkPosition($options); |
| 260 |
$use_cache = ($raw_position !== 'random') && $this->isCacheEnabled(); |
| 261 |
|
| 262 |
if ($use_cache) { |
| 263 |
$cache_key = $this->generateCacheKey($img_url, $merged); |
| 264 |
$cached_file = $this->getCachedImage($cache_key); |
| 265 |
if ($cached_file) { |
| 266 |
copy($cached_file, $new_img_url); |
| 267 |
return true; |
| 268 |
} |
| 269 |
} |
| 270 |
|
| 271 |
// Validate image |
| 272 |
$img_size = getimagesize($img_url); |
| 273 |
if (empty($img_size)) { |
| 274 |
throw new Exception('Invalid image file'); |
| 275 |
} |
| 276 |
|
| 277 |
// Validate dimensions |
| 278 |
if ($img_size[0] < $this->options['watermark_min_width'] || |
| 279 |
$img_size[1] < $this->options['watermark_min_height']) { |
| 280 |
throw new Exception('Image dimensions too small for watermark'); |
| 281 |
} |
| 282 |
|
| 283 |
// Create image resource |
| 284 |
$im = $this->createImageResource($img_url, $img_size['mime']); |
| 285 |
if (!$im) { |
| 286 |
throw new Exception('Failed to create image resource'); |
| 287 |
} |
| 288 |
|
| 289 |
// Load watermark image |
| 290 |
$watermark_size = getimagesize($watermark_url); |
| 291 |
if (!$watermark_size) { |
| 292 |
throw new Exception('Invalid watermark image'); |
| 293 |
} |
| 294 |
|
| 295 |
$watermark = $this->createImageResource($watermark_url, $watermark_size['mime']); |
| 296 |
if (!$watermark) { |
| 297 |
throw new Exception('Failed to create watermark resource'); |
| 298 |
} |
| 299 |
|
| 300 |
$scale_percent = intval($options['image_watermark_scale'] ?? $this->options['image_watermark_scale'] ?? 100); |
| 301 |
$scale_percent = min(100, max(1, $scale_percent)); |
| 302 |
if ($scale_percent < 100) { |
| 303 |
$scaled_width = max(1, intval(round($watermark_size[0] * $scale_percent / 100))); |
| 304 |
$scaled_height = max(1, intval(round($watermark_size[1] * $scale_percent / 100))); |
| 305 |
$scaled_watermark = $this->resizeWatermarkResource( |
| 306 |
$watermark, |
| 307 |
$watermark_size[0], |
| 308 |
$watermark_size[1], |
| 309 |
$scaled_width, |
| 310 |
$scaled_height |
| 311 |
); |
| 312 |
if ($scaled_watermark) { |
| 313 |
imagedestroy($watermark); |
| 314 |
$watermark = $scaled_watermark; |
| 315 |
$watermark_size[0] = $scaled_width; |
| 316 |
$watermark_size[1] = $scaled_height; |
| 317 |
} |
| 318 |
} |
| 319 |
|
| 320 |
// Calculate position |
| 321 |
$position = $this->calculatePosition( |
| 322 |
$this->resolveGridPosition($raw_position), |
| 323 |
$img_size[0], |
| 324 |
$img_size[1], |
| 325 |
'', |
| 326 |
$watermark_size[0], |
| 327 |
$watermark_size[1] |
| 328 |
); |
| 329 |
|
| 330 |
// 创建临时图像用于处理 |
| 331 |
$temp = imagecreatetruecolor($img_size[0], $img_size[1]); |
| 332 |
|
| 333 |
// 设置临时图像的透明度支持 |
| 334 |
imagealphablending($temp, false); |
| 335 |
imagesavealpha($temp, true); |
| 336 |
|
| 337 |
// 如果原图是PNG，设置透明背景 |
| 338 |
if ($img_size['mime'] === 'image/png' || $img_size['mime'] === 'image/webp') { |
| 339 |
$transparent = imagecolorallocatealpha($temp, 0, 0, 0, 127); |
| 340 |
imagefilledrectangle($temp, 0, 0, $img_size[0], $img_size[1], $transparent); |
| 341 |
} |
| 342 |
|
| 343 |
// 复制原图到临时图像 |
| 344 |
imagecopy($temp, $im, 0, 0, 0, 0, $img_size[0], $img_size[1]); |
| 345 |
|
| 346 |
// 获取透明度设置 |
| 347 |
$opacity = ($options['watermark_diaphaneity'] ?? $this->options['watermark_diaphaneity']); |
| 348 |
|
| 349 |
// 如果是PNG水印，保持� |
| 350 |
�原有透明度 |
| 351 |
if ($watermark_size['mime'] === 'image/png' || $watermark_size['mime'] === 'image/webp') { |
| 352 |
// 创建水印临时图像 |
| 353 |
$watermark_temp = imagecreatetruecolor($watermark_size[0], $watermark_size[1]); |
| 354 |
imagealphablending($watermark_temp, false); |
| 355 |
imagesavealpha($watermark_temp, true); |
| 356 |
|
| 357 |
// 设置完� |
| 358 |
�透明背景 |
| 359 |
$transparent = imagecolorallocatealpha($watermark_temp, 0, 0, 0, 127); |
| 360 |
imagefilledrectangle($watermark_temp, 0, 0, $watermark_size[0], $watermark_size[1], $transparent); |
| 361 |
|
| 362 |
// 复制水印到临时图像 |
| 363 |
imagecopy($watermark_temp, $watermark, 0, 0, 0, 0, $watermark_size[0], $watermark_size[1]); |
| 364 |
|
| 365 |
// 应用用户设置的透明度 |
| 366 |
if ($opacity < 100) { |
| 367 |
// 逐像素调整透明度 |
| 368 |
for ($x = 0; $x < $watermark_size[0]; $x++) { |
| 369 |
for ($y = 0; $y < $watermark_size[1]; $y++) { |
| 370 |
$color = imagecolorsforindex($watermark_temp, imagecolorat($watermark_temp, $x, $y)); |
| 371 |
$alpha = 127 - ((127 - $color['alpha']) * $opacity / 100); |
| 372 |
$new_color = imagecolorallocatealpha( |
| 373 |
$watermark_temp, |
| 374 |
$color['red'], |
| 375 |
$color['green'], |
| 376 |
$color['blue'], |
| 377 |
intval($alpha) |
| 378 |
); |
| 379 |
imagesetpixel($watermark_temp, $x, $y, $new_color); |
| 380 |
} |
| 381 |
} |
| 382 |
} |
| 383 |
|
| 384 |
// 合并水印到目标图像 |
| 385 |
imagealphablending($temp, true); |
| 386 |
imagecopy($temp, $watermark_temp, $position['x'], $position['y'], 0, 0, $watermark_size[0], $watermark_size[1]); |
| 387 |
imagedestroy($watermark_temp); |
| 388 |
} else { |
| 389 |
// 非PNG水印的处理 |
| 390 |
imagealphablending($temp, true); |
| 391 |
$this->imagecopymerge_alpha( |
| 392 |
$temp, $watermark, |
| 393 |
$position['x'], $position['y'], |
| 394 |
0, 0, |
| 395 |
$watermark_size[0], $watermark_size[1], |
| 396 |
$opacity |
| 397 |
); |
| 398 |
} |
| 399 |
|
| 400 |
// 保存最终图像 |
| 401 |
if ($img_size['mime'] === 'image/png' || $img_size['mime'] === 'image/webp') { |
| 402 |
imagealphablending($temp, false); |
| 403 |
imagesavealpha($temp, true); |
| 404 |
} |
| 405 |
$this->saveImage($temp, $new_img_url, $img_size['mime']); |
| 406 |
|
| 407 |
if ($use_cache) { |
| 408 |
$cache_ext = 'jpg'; |
| 409 |
if ($img_size['mime'] === 'image/png') { |
| 410 |
$cache_ext = 'png'; |
| 411 |
} elseif ($img_size['mime'] === 'image/gif') { |
| 412 |
$cache_ext = 'gif'; |
| 413 |
} elseif ($img_size['mime'] === 'image/webp') { |
| 414 |
$cache_ext = 'webp'; |
| 415 |
} |
| 416 |
$cache_file = $this->cache_dir . $cache_key . '.' . $cache_ext; |
| 417 |
copy($new_img_url, $cache_file); |
| 418 |
} |
| 419 |
|
| 420 |
// � |
| 421 |
理资源 |
| 422 |
imagedestroy($temp); |
| 423 |
imagedestroy($im); |
| 424 |
imagedestroy($watermark); |
| 425 |
|
| 426 |
return true; |
| 427 |
|
| 428 |
} catch (Exception $e) { |
| 429 |
error_log('WaterMark Error: ' . $e->getMessage()); |
| 430 |
return false; |
| 431 |
} |
| 432 |
} |
| 433 |
|
| 434 |
/** |
| 435 |
* Helper function to create image resource |
| 436 |
* |
| 437 |
* @param string $img_url |
| 438 |
* @param string $mime_type |
| 439 |
* @return resource|false |
| 440 |
*/ |
| 441 |
private function createImageResource(string $img_url, string $mime_type) { |
| 442 |
$create_functions = [ |
| 443 |
'image/jpeg' => 'imagecreatefromjpeg', |
| 444 |
'image/png' => 'imagecreatefrompng', |
| 445 |
'image/gif' => 'imagecreatefromgif' |
| 446 |
]; |
| 447 |
|
| 448 |
if (function_exists('imagecreatefromwebp')) { |
| 449 |
$create_functions['image/webp'] = 'imagecreatefromwebp'; |
| 450 |
} |
| 451 |
|
| 452 |
if (isset($create_functions[$mime_type])) { |
| 453 |
$im = call_user_func($create_functions[$mime_type], $img_url); |
| 454 |
|
| 455 |
// 特别处理PNG图片的透明度 |
| 456 |
if ($mime_type === 'image/png' || $mime_type === 'image/webp') { |
| 457 |
imagealphablending($im, false); |
| 458 |
imagesavealpha($im, true); |
| 459 |
} |
| 460 |
|
| 461 |
return $im; |
| 462 |
} |
| 463 |
|
| 464 |
return false; |
| 465 |
} |
| 466 |
|
| 467 |
/** |
| 468 |
* JPEG/WebP 有损输出质量（与站点 `jpeg_quality` 过滤器对齐后再限制范围） |
| 469 |
*/ |
| 470 |
private function getOutputJpegWebpQuality(): int { |
| 471 |
$q = isset($this->options['output_jpeg_webp_quality']) |
| 472 |
? (int) $this->options['output_jpeg_webp_quality'] |
| 473 |
: 82; |
| 474 |
$q = max(40, min(100, $q)); |
| 475 |
$filtered = (int) apply_filters('jpeg_quality', $q); |
| 476 |
return max(40, min(100, $filtered)); |
| 477 |
} |
| 478 |
|
| 479 |
/** |
| 480 |
* PNG zlib 压缩级别 0–9（无损，� |
| 481 |
影响体积与编码耗时） |
| 482 |
*/ |
| 483 |
private function getPngCompressionLevel(): int { |
| 484 |
$level = isset($this->options['output_png_compression']) |
| 485 |
? (int) $this->options['output_png_compression'] |
| 486 |
: 6; |
| 487 |
$level = max(0, min(9, $level)); |
| 488 |
return max(0, min(9, (int) apply_filters('wpwatermark_png_compression', $level))); |
| 489 |
} |
| 490 |
|
| 491 |
/** |
| 492 |
* Helper function to save image |
| 493 |
* |
| 494 |
* @param resource $im |
| 495 |
* @param string $filename |
| 496 |
* @param string $mime_type |
| 497 |
* @return bool |
| 498 |
*/ |
| 499 |
private function saveImage($im, string $filename, string $mime_type): bool { |
| 500 |
switch ($mime_type) { |
| 501 |
case 'image/jpeg': |
| 502 |
return imagejpeg($im, $filename, $this->getOutputJpegWebpQuality()); |
| 503 |
case 'image/png': |
| 504 |
// 第三参数为压缩级别：0 无压缩体积极大；PNG 无损，提高级别不损画质 |
| 505 |
return imagepng($im, $filename, $this->getPngCompressionLevel()); |
| 506 |
case 'image/gif': |
| 507 |
return imagegif($im, $filename); |
| 508 |
case 'image/webp': |
| 509 |
if (function_exists('imagewebp')) { |
| 510 |
return imagewebp($im, $filename, $this->getOutputJpegWebpQuality()); |
| 511 |
} |
| 512 |
return false; |
| 513 |
default: |
| 514 |
return false; |
| 515 |
} |
| 516 |
} |
| 517 |
|
| 518 |
/** |
| 519 |
* Parse hex color to RGB |
| 520 |
*/ |
| 521 |
private function parseColor($hex_color) { |
| 522 |
$hex_color = ltrim($hex_color, '#'); |
| 523 |
return [ |
| 524 |
'r' => hexdec(substr($hex_color, 0, 2)), |
| 525 |
'g' => hexdec(substr($hex_color, 2, 2)), |
| 526 |
'b' => hexdec(substr($hex_color, 4, 2)) |
| 527 |
]; |
| 528 |
} |
| 529 |
|
| 530 |
/** |
| 531 |
* Helper function for alpha-enabled imagecopymerge |
| 532 |
* |
| 533 |
* @param resource $dst_im |
| 534 |
* @param resource $src_im |
| 535 |
* @param int $dst_x |
| 536 |
* @param int $dst_y |
| 537 |
* @param int $src_x |
| 538 |
* @param int $src_y |
| 539 |
* @param int $src_w |
| 540 |
* @param int $src_h |
| 541 |
* @param int $pct |
| 542 |
* @return void |
| 543 |
*/ |
| 544 |
private function imagecopymerge_alpha($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct) { |
| 545 |
// 确保透明度在有效范围� |
| 546 |
|
| 547 |
$pct = min(100, max(0, $pct)); |
| 548 |
|
| 549 |
// 创建临时图像 |
| 550 |
$cut = imagecreatetruecolor($src_w, $src_h); |
| 551 |
|
| 552 |
// 设置完� |
| 553 |
�透明背景 |
| 554 |
imagealphablending($cut, false); |
| 555 |
imagesavealpha($cut, true); |
| 556 |
$transparent = imagecolorallocatealpha($cut, 0, 0, 0, 127); |
| 557 |
imagefilledrectangle($cut, 0, 0, $src_w, $src_h, $transparent); |
| 558 |
|
| 559 |
// 复制目标区域到临时图像 |
| 560 |
imagecopy($cut, $dst_im, 0, 0, intval($dst_x), intval($dst_y), $src_w, $src_h); |
| 561 |
|
| 562 |
// 启用混合模式 |
| 563 |
imagealphablending($cut, true); |
| 564 |
|
| 565 |
// 应用水印到临时图像 |
| 566 |
$this->imagecopymerge_alpha_pixel($cut, $src_im, 0, 0, intval($src_x), intval($src_y), $src_w, $src_h, $pct); |
| 567 |
|
| 568 |
// 保持目标图像的透明度 |
| 569 |
imagealphablending($dst_im, true); |
| 570 |
imagesavealpha($dst_im, true); |
| 571 |
|
| 572 |
// 将处理后的临时图像复制回目标图像 |
| 573 |
imagecopy($dst_im, $cut, intval($dst_x), intval($dst_y), 0, 0, $src_w, $src_h); |
| 574 |
|
| 575 |
// � |
| 576 |
理 |
| 577 |
imagedestroy($cut); |
| 578 |
} |
| 579 |
|
| 580 |
/** |
| 581 |
* 逐像素处理透明度 |
| 582 |
*/ |
| 583 |
private function imagecopymerge_alpha_pixel($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct) { |
| 584 |
if ($pct == 0) return; |
| 585 |
|
| 586 |
// 逐像素处理 |
| 587 |
for ($y = 0; $y < $src_h; ++$y) { |
| 588 |
for ($x = 0; $x < $src_w; ++$x) { |
| 589 |
$src_color = imagecolorsforindex($src_im, imagecolorat($src_im, $src_x + $x, $src_y + $y)); |
| 590 |
$dst_color = imagecolorsforindex($dst_im, imagecolorat($dst_im, $dst_x + $x, $dst_y + $y)); |
| 591 |
|
| 592 |
// 按 Porter-Duff over 合成，避� |
| 593 |
�边缘泛白/发灰 |
| 594 |
$src_opacity = (1 - ($src_color['alpha'] / 127)) * ($pct / 100); |
| 595 |
$dst_opacity = 1 - ($dst_color['alpha'] / 127); |
| 596 |
$out_opacity = $src_opacity + $dst_opacity * (1 - $src_opacity); |
| 597 |
|
| 598 |
if ($out_opacity <= 0) { |
| 599 |
continue; |
| 600 |
} |
| 601 |
|
| 602 |
$final_red = (($src_color['red'] * $src_opacity) + ($dst_color['red'] * $dst_opacity * (1 - $src_opacity))) / $out_opacity; |
| 603 |
$final_green = (($src_color['green'] * $src_opacity) + ($dst_color['green'] * $dst_opacity * (1 - $src_opacity))) / $out_opacity; |
| 604 |
$final_blue = (($src_color['blue'] * $src_opacity) + ($dst_color['blue'] * $dst_opacity * (1 - $src_opacity))) / $out_opacity; |
| 605 |
$final_alpha = 127 - intval(round($out_opacity * 127)); |
| 606 |
|
| 607 |
// 创建新颜色 |
| 608 |
$final_color = imagecolorallocatealpha( |
| 609 |
$dst_im, |
| 610 |
intval(round($final_red)), |
| 611 |
intval(round($final_green)), |
| 612 |
intval(round($final_blue)), |
| 613 |
min(127, max(0, intval($final_alpha))) |
| 614 |
); |
| 615 |
|
| 616 |
// 设置像素 |
| 617 |
imagesetpixel($dst_im, $dst_x + $x, $dst_y + $y, $final_color); |
| 618 |
} |
| 619 |
} |
| 620 |
} |
| 621 |
|
| 622 |
/** |
| 623 |
* Resize watermark image while preserving alpha channel. |
| 624 |
*/ |
| 625 |
private function resizeWatermarkResource($source, $source_width, $source_height, $target_width, $target_height) { |
| 626 |
if ($target_width <= 0 || $target_height <= 0) { |
| 627 |
return false; |
| 628 |
} |
| 629 |
|
| 630 |
$target = imagecreatetruecolor($target_width, $target_height); |
| 631 |
imagealphablending($target, false); |
| 632 |
imagesavealpha($target, true); |
| 633 |
|
| 634 |
$transparent = imagecolorallocatealpha($target, 0, 0, 0, 127); |
| 635 |
imagefilledrectangle($target, 0, 0, $target_width, $target_height, $transparent); |
| 636 |
|
| 637 |
$success = imagecopyresampled( |
| 638 |
$target, |
| 639 |
$source, |
| 640 |
0, |
| 641 |
0, |
| 642 |
0, |
| 643 |
0, |
| 644 |
$target_width, |
| 645 |
$target_height, |
| 646 |
$source_width, |
| 647 |
$source_height |
| 648 |
); |
| 649 |
|
| 650 |
if (!$success) { |
| 651 |
imagedestroy($target); |
| 652 |
return false; |
| 653 |
} |
| 654 |
|
| 655 |
imagealphablending($target, true); |
| 656 |
return $target; |
| 657 |
} |
| 658 |
|
| 659 |
/** |
| 660 |
* Calculate watermark position |
| 661 |
* |
| 662 |
* @param string $position |
| 663 |
* @param int $img_width |
| 664 |
* @param int $img_height |
| 665 |
* @param string $text |
| 666 |
* @param int $mark_width |
| 667 |
* @param int $mark_height |
| 668 |
* @return array{x: int, y: int} |
| 669 |
*/ |
| 670 |
private function calculatePosition($position, $img_width, $img_height, $text = '', $mark_width = 0, $mark_height = 0, $font_size = null, $font_angle = null, $font_file = null) { |
| 671 |
$margin = intval($this->options['watermark_margin']); |
| 672 |
|
| 673 |
// For text watermark |
| 674 |
if ($text !== '') { |
| 675 |
$font_size = $font_size === null ? intval($this->options['text_size']) : intval($font_size); |
| 676 |
$font_angle = $font_angle === null ? intval($this->options['text_angle']) : intval($font_angle); |
| 677 |
$font_file = $font_file === null ? $this->font_dir . $this->options['text_font'] : $font_file; |
| 678 |
$text_box = imagettfbbox($font_size, $font_angle, $font_file, $text); |
| 679 |
$mark_width = abs($text_box[2] - $text_box[0]); |
| 680 |
$mark_height = abs($text_box[1] - $text_box[7]); |
| 681 |
} |
| 682 |
|
| 683 |
// Calculate grid dimensions |
| 684 |
$grid_width = $img_width / 3; |
| 685 |
$grid_height = $img_height / 3; |
| 686 |
|
| 687 |
// Calculate position based on grid |
| 688 |
switch ($position) { |
| 689 |
case 'top-left': |
| 690 |
return [ |
| 691 |
'x' => $margin, |
| 692 |
'y' => $margin |
| 693 |
]; |
| 694 |
|
| 695 |
case 'top-center': |
| 696 |
return [ |
| 697 |
'x' => intval($grid_width + ($grid_width - $mark_width) / 2), |
| 698 |
'y' => $margin |
| 699 |
]; |
| 700 |
|
| 701 |
case 'top-right': |
| 702 |
return [ |
| 703 |
'x' => intval($img_width - $mark_width - $margin), |
| 704 |
'y' => $margin |
| 705 |
]; |
| 706 |
|
| 707 |
case 'middle-left': |
| 708 |
return [ |
| 709 |
'x' => $margin, |
| 710 |
'y' => intval($grid_height + ($grid_height - $mark_height) / 2) |
| 711 |
]; |
| 712 |
|
| 713 |
case 'middle-center': |
| 714 |
return [ |
| 715 |
'x' => intval($grid_width + ($grid_width - $mark_width) / 2), |
| 716 |
'y' => intval($grid_height + ($grid_height - $mark_height) / 2) |
| 717 |
]; |
| 718 |
|
| 719 |
case 'middle-right': |
| 720 |
return [ |
| 721 |
'x' => intval($img_width - $mark_width - $margin), |
| 722 |
'y' => intval($grid_height + ($grid_height - $mark_height) / 2) |
| 723 |
]; |
| 724 |
|
| 725 |
case 'bottom-left': |
| 726 |
return [ |
| 727 |
'x' => $margin, |
| 728 |
'y' => intval($img_height - $mark_height - $margin) |
| 729 |
]; |
| 730 |
|
| 731 |
case 'bottom-center': |
| 732 |
return [ |
| 733 |
'x' => intval($grid_width + ($grid_width - $mark_width) / 2), |
| 734 |
'y' => intval($img_height - $mark_height - $margin) |
| 735 |
]; |
| 736 |
|
| 737 |
case 'bottom-right': |
| 738 |
default: |
| 739 |
return [ |
| 740 |
'x' => intval($img_width - $mark_width - $margin), |
| 741 |
'y' => intval($img_height - $mark_height - $margin) |
| 742 |
]; |
| 743 |
} |
| 744 |
} |
| 745 |
|
| 746 |
/** |
| 747 |
* Render text on a transparent layer first to avoid edge artifacts. |
| 748 |
*/ |
| 749 |
private function renderTextLayer($base_image, $width, $height, $text, $font_file, $font_size, $font_angle, $x, $y, $rgb, $opacity) { |
| 750 |
$layer = imagecreatetruecolor($width, $height); |
| 751 |
imagealphablending($layer, false); |
| 752 |
imagesavealpha($layer, true); |
| 753 |
|
| 754 |
$transparent = imagecolorallocatealpha($layer, 0, 0, 0, 127); |
| 755 |
imagefilledrectangle($layer, 0, 0, $width, $height, $transparent); |
| 756 |
|
| 757 |
imagealphablending($layer, true); |
| 758 |
$alpha = intval(round((100 - $opacity) * 127 / 100)); // 0(不透明)-127(� |
| 759 |
�透明) |
| 760 |
$text_color = imagecolorallocatealpha($layer, $rgb['r'], $rgb['g'], $rgb['b'], $alpha); |
| 761 |
|
| 762 |
imagettftext( |
| 763 |
$layer, |
| 764 |
$font_size, |
| 765 |
$font_angle, |
| 766 |
$x, |
| 767 |
$y, |
| 768 |
$text_color, |
| 769 |
$font_file, |
| 770 |
$text |
| 771 |
); |
| 772 |
|
| 773 |
imagealphablending($base_image, true); |
| 774 |
imagecopy($base_image, $layer, 0, 0, 0, 0, $width, $height); |
| 775 |
imagedestroy($layer); |
| 776 |
} |
| 777 |
} |
