无需手工垫图，也能让Gemini 2.5 Flash Image Preview支持比例调节

昨天发了个【教程】另辟蹊径，让 Gemini 2.5 Flash Image Preview 也能生成特定比例图像，但是还是需要手工来垫图，终归有些麻烦，因而CLIProxyAPI的作者进行了魔改，对gemini-2.5-flash-image-preview的请求进行了修改

原理也是垫图，但是不需要手工去垫了，当检测到generationConfig.imageConfig.aspectRatio字段后，如果请求不带有图像，就由程序自动按照aspectRatio的值来绘图，并附加在请求中，CLIProxyAPI的v6.1.13版本已经支持，Hook的核心代码如下：

func fixGeminiCLIImageAspectRatio(modelName string, rawJSON []byte) []byte {
	if modelName == "gemini-2.5-flash-image-preview" {
		aspectRatioResult := gjson.GetBytes(rawJSON, "request.generationConfig.imageConfig.aspectRatio")
		if aspectRatioResult.Exists() {
			contents := gjson.GetBytes(rawJSON, "request.contents")
			contentArray := contents.Array()
			if len(contentArray) > 0 {
				hasInlineData := false
			loopContent:
				for i := 0; i < len(contentArray); i++ {
					parts := contentArray[i].Get("parts").Array()
					for j := 0; j < len(parts); j++ {
						if parts[j].Get("inlineData").Exists() {
							hasInlineData = true
							break loopContent
						}
					}
				}

				if !hasInlineData {
					emptyImageBase64ed, _ := util.CreateWhiteImageBase64(aspectRatioResult.String())
					emptyImagePart := `{"inlineData":{"mime_type":"image/png","data":""}}`
					emptyImagePart, _ = sjson.Set(emptyImagePart, "inlineData.data", emptyImageBase64ed)
					newPartsJson := `[]`
					newPartsJson, _ = sjson.SetRaw(newPartsJson, "-1", `{"text": "Based on the following requirements, create an image within the uploaded picture. The new content *MUST* completely cover the entire area of the original picture, maintaining its exact proportions, and *NO* blank areas should appear."}`)
					newPartsJson, _ = sjson.SetRaw(newPartsJson, "-1", emptyImagePart)

					parts := contentArray[0].Get("parts").Array()
					for j := 0; j < len(parts); j++ {
						newPartsJson, _ = sjson.SetRaw(newPartsJson, "-1", parts[j].Raw)
					}

					rawJSON, _ = sjson.SetRawBytes(rawJSON, "request.contents.0.parts", []byte(newPartsJson))
					rawJSON, _ = sjson.SetRawBytes(rawJSON, "request.generationConfig.responseModalities", []byte(`["Image", "Text"]`))
				}
			}
			rawJSON, _ = sjson.DeleteBytes(rawJSON, "request.generationConfig.imageConfig")
		}
	}
	return rawJSON
}

同时，魔改NanoBanana WebUI也进行了修改适配，允许gemini-2.5-flash-image-preview模型指定宽高比发送请求，希望大家用的愉快