聊天上传图片压缩，新增返回原图接口5

app/common/controller/Upload.php

@@ -422,80 +422,47 @@ class Upload extends BaseController
         // 处理图地址
         $target = root_path().'public/' .ltrim($compress_path,'/');
         // 图片模糊处理
-        if (class_exists('Imagick')) {
-            $compress_res = $this->slightBlurImagick($filePath, $target, 1);
-        } else {
-            $compress_res = $this->slightBlurGD($filePath, $target, 1);
-        }
+        $compress_res = $this->slightBlurGD($filePath, $target);
         if (!$compress_res) {
             return '';
         }
         return $compress_path;
     }
 
-    // 使用Imagick添加轻微模糊
-    protected function slightBlurImagick($source, $target, $blurLevel)
-    {
-        try {
-            $imagick = new \Imagick($source);
-
-            // 轻微模糊 (半径0.5-2.0)
-            $radius = min(2.0, max(0.5, $blurLevel * 0.5));
-            $imagick->gaussianBlurImage($radius, 1);
-
-            // 保存时降低质量
-            $extension = strtolower(pathinfo($target, PATHINFO_EXTENSION));
-
-            switch ($extension) {
-                case 'jpg':
-                case 'jpeg':
-                    $imagick->setImageCompressionQuality(85);
-                    $imagick->setImageFormat('jpeg');
-                break;
-                case 'webp':
-                case 'png':
-                    $imagick->setImageCompressionQuality(85);
-                break;
-            }
-
-            return $imagick->writeImage($target);
-        } catch (\Exception $e) {
-            \think\facade\Log::error('Imagick模糊处理失败: ' . $e->getMessage());
-            return false;
-        }
-    }
-
     // 使用GD库添加轻微模糊
-    protected function slightBlurGD($source, $target, $blurLevel)
+    protected function slightBlurGD($imageFile, $target)
     {
-        $info = getimagesize($source);
-        $type = $info[2];
-
-        // 创建图像资源
-        switch ($type) {
+        // 获取图片信息
+        list($imgWidth, $imgHeight, $imageType) = getimagesize($imageFile);
+        // 根据图片类型创建图像资源
+        switch ($imageType) {
             case IMAGETYPE_JPEG:
-                $image = imagecreatefromjpeg($source);
+                $image = imagecreatefromjpeg($imageFile);
             break;
             case IMAGETYPE_PNG:
-                $image = imagecreatefrompng($source);
+                $image = imagecreatefrompng($imageFile);
+                // 保留透明通道
+                imagealphablending($image, true);
+                imagesavealpha($image, true);
             break;
             case IMAGETYPE_GIF:
-                $image = imagecreatefromgif($source);
-            break;
-            case IMAGETYPE_WEBP:
-                $image = imagecreatefromwebp($source);
+                $image = imagecreatefromgif($imageFile);
             break;
             default:
                 return false;
         }
 
-        // 应用轻微模糊
-        for ($i = 0; $i < $blurLevel; $i++) {
-            imagefilter($image, IMG_FILTER_GAUSSIAN_BLUR);
-        }
+        // 获取图片尺寸
+
+        // 调整选择区域确保在图片范围内
+        $x = 0;
+        $y = 0;
+
+        // 应用马赛克效果
+        $this->applyMosaic($image, $x, $y, $imgWidth, $imgHeight, 5, 2);
 
         // 保存图片
-        switch ($type) {
+        switch ($imageType) {
             case IMAGETYPE_JPEG:
                 imagejpeg($image, $target, 85);
             break;
@@ -510,7 +477,119 @@ class Upload extends BaseController
             break;
         }
 
-        imagedestroy($image);
         return true;
     }
+
+    /**
+     * 应用马赛克效果
+     *
+     * @param resource $image 图像资源
+     * @param int $x 起始X坐标
+     * @param int $y 起始Y坐标
+     * @param int $width 区域宽度
+     * @param int $height 区域高度
+     * @param int $blockSize 马赛克块大小
+     * @param int $blurStrength 模糊强度 (1-3)
+     */
+    protected function applyMosaic($image, $x, $y, $width, $height, $blockSize, $blurStrength) {
+        // 调整马赛克块大小
+        $adjustedBlockSize = $blockSize * $blurStrength;
+
+        // 计算马赛克网格
+        $cols = ceil($width / $adjustedBlockSize);
+        $rows = ceil($height / $adjustedBlockSize);
+
+        // 处理每个马赛克块
+        for ($row = 0; $row < $rows; $row++) {
+            for ($col = 0; $col < $cols; $col++) {
+                // 计算当前块的区域
+                $blockX = $x + $col * $adjustedBlockSize;
+                $blockY = $y + $row * $adjustedBlockSize;
+                $blockWidth = min($adjustedBlockSize, $width - $col * $adjustedBlockSize);
+                $blockHeight = min($adjustedBlockSize, $height - $row * $adjustedBlockSize);
+
+                // 计算块内像素的平均颜色
+                $avgColor = $this->calculateAverageColor($image, $blockX, $blockY, $blockWidth, $blockHeight);
+
+                // 填充整个块为平均颜色
+                imagefilledrectangle(
+                    $image,
+                    $blockX,
+                    $blockY,
+                    $blockX + $blockWidth - 1,
+                    $blockY + $blockHeight - 1,
+                    $avgColor
+                );
+            }
+        }
+
+        // 根据需要应用额外模糊
+        if ($blurStrength > 1) {
+            $blurRegion = imagecrop($image, ['x' => $x, 'y' => $y, 'width' => $width, 'height' => $height]);
+            if ($blurRegion !== false) {
+                // 应用模糊
+                for ($i = 0; $i < $blurStrength; $i++) {
+                    imagefilter($blurRegion, IMG_FILTER_GAUSSIAN_BLUR);
+                }
+
+                // 将模糊后的区域放回原图
+                imagecopymerge($image, $blurRegion, $x, $y, 0, 0, $width, $height, 100);
+                imagedestroy($blurRegion);
+            }
+        }
+    }
+
+    /**
+     * 计算图像区域的平均颜色
+     *
+     * @param resource $image 图像资源
+     * @param int $x 起始X坐标
+     * @param int $y 起始Y坐标
+     * @param int $width 区域宽度
+     * @param int $height 区域高度
+     * @return int 颜色标识符
+     */
+    protected function calculateAverageColor($image, $x, $y, $width, $height) {
+        $totalR = 0;
+        $totalG = 0;
+        $totalB = 0;
+        $totalAlpha = 0;
+        $pixelCount = 0;
+
+        // 遍历区域内的所有像素
+        for ($i = 0; $i < $width; $i++) {
+            for ($j = 0; $j < $height; $j++) {
+                $px = $x + $i;
+                $py = $y + $j;
+
+                // 确保像素在图像范围内
+                if ($px >= imagesx($image)) continue;
+                if ($py >= imagesy($image)) continue;
+
+                // 获取像素颜色
+                $color = imagecolorat($image, $px, $py);
+                $rgba = imagecolorsforindex($image, $color);
+
+                // 累加颜色值
+                $totalR += $rgba['red'];
+                $totalG += $rgba['green'];
+                $totalB += $rgba['blue'];
+                $totalAlpha += $rgba['alpha'];
+                $pixelCount++;
+            }
+        }
+
+        // 计算平均值
+        if ($pixelCount === 0) {
+            return imagecolorallocatealpha($image, 0, 0, 0, 127);
+        }
+
+        $avgR = round($totalR / $pixelCount);
+        $avgG = round($totalG / $pixelCount);
+        $avgB = round($totalB / $pixelCount);
+        $avgAlpha = round($totalAlpha / $pixelCount);
+
+        // 返回平均颜色
+        return imagecolorallocatealpha($image, $avgR, $avgG, $avgB, $avgAlpha);
+    }
 }