From 0059a232a6c29dbabb5403ce3730de100bf954fa Mon Sep 17 00:00:00 2001
From: song <slovx2@gmail.com>
Date: Mon, 26 Jan 2026 20:51:40 +0800
Subject: [PATCH] =?UTF-8?q?feat(gemini):=20=E4=B8=BA=20Gemini=20=E5=8E=9F?=
 =?UTF-8?q?=E7=94=9F=E5=B9=B3=E5=8F=B0=E6=B7=BB=E5=8A=A0=E5=9B=BE=E7=89=87?=
 =?UTF-8?q?=E8=AE=A1=E8=B4=B9=E6=94=AF=E6=8C=81?=
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对齐 Antigravity 平台的图片计费逻辑：
- 添加 extractImageSize() 方法提取图片尺寸
- Forward() 和 ForwardNative() 返回 ImageCount/ImageSize
- 支持分组自定义图片价格和倍率
---
 .../service/gemini_messages_compat_service.go | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/backend/internal/service/gemini_messages_compat_service.go b/backend/internal/service/gemini_messages_compat_service.go
index 396c48293..aea880c25 100644
--- a/backend/internal/service/gemini_messages_compat_service.go
+++ b/backend/internal/service/gemini_messages_compat_service.go
@@ -931,6 +931,13 @@ func (s *GeminiMessagesCompatService) Forward(ctx context.Context, c *gin.Contex
 		}
 	}
 
+	// 图片生成计费
+	imageCount := 0
+	imageSize := s.extractImageSize(body)
+	if isImageGenerationModel(originalModel) {
+		imageCount = 1
+	}
+
 	return &ForwardResult{
 		RequestID:    requestID,
 		Usage:        *usage,
@@ -938,6 +945,8 @@ func (s *GeminiMessagesCompatService) Forward(ctx context.Context, c *gin.Contex
 		Stream:       req.Stream,
 		Duration:     time.Since(startTime),
 		FirstTokenMs: firstTokenMs,
+		ImageCount:   imageCount,
+		ImageSize:    imageSize,
 	}, nil
 }
 
@@ -1371,6 +1380,13 @@ func (s *GeminiMessagesCompatService) ForwardNative(ctx context.Context, c *gin.
 		usage = &ClaudeUsage{}
 	}
 
+	// 图片生成计费
+	imageCount := 0
+	imageSize := s.extractImageSize(body)
+	if isImageGenerationModel(originalModel) {
+		imageCount = 1
+	}
+
 	return &ForwardResult{
 		RequestID:    requestID,
 		Usage:        *usage,
@@ -1378,6 +1394,8 @@ func (s *GeminiMessagesCompatService) ForwardNative(ctx context.Context, c *gin.
 		Stream:       stream,
 		Duration:     time.Since(startTime),
 		FirstTokenMs: firstTokenMs,
+		ImageCount:   imageCount,
+		ImageSize:    imageSize,
 	}, nil
 }
 
@@ -3031,3 +3049,26 @@ func convertClaudeGenerationConfig(req map[string]any) map[string]any {
 	}
 	return out
 }
+
+// extractImageSize 从 Gemini 请求中提取 image_size 参数
+func (s *GeminiMessagesCompatService) extractImageSize(body []byte) string {
+	var req struct {
+		GenerationConfig *struct {
+			ImageConfig *struct {
+				ImageSize string `json:"imageSize"`
+			} `json:"imageConfig"`
+		} `json:"generationConfig"`
+	}
+	if err := json.Unmarshal(body, &req); err != nil {
+		return "2K"
+	}
+
+	if req.GenerationConfig != nil && req.GenerationConfig.ImageConfig != nil {
+		size := strings.ToUpper(strings.TrimSpace(req.GenerationConfig.ImageConfig.ImageSize))
+		if size == "1K" || size == "2K" || size == "4K" {
+			return size
+		}
+	}
+
+	return "2K"
+}