为美术包增加图片自动转码

美术包在本地提交前将 JPEG 和 WebP 转为 PNG，保留有效 PNG 原字节
统一最终图片的扩展名、媒体类型与恢复摘要，保留原有透明度和大小校验
覆盖损坏下载重试、账本保留和清理、重复恢复零生成请求，并同步规范与排障记录
验证通过 106 项定向测试及格式、编码、文档索引和差异检查

apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs

@@ -3144,27 +3144,16 @@ async fn generate_direct_taonier_art_asset_at(
     };
     let runtime_context =
         direct_taonier_art_generation_runtime_context(root, output_path, asset_kind)?;
-    let generation = if retain_runtime_state {
-        generate_platform_art_asset_with_retained_runtime_options_at(
-            root,
-            prompt,
-            &[],
-            &options,
-            require_slices,
-            &runtime_context,
-        )
-        .await
-    } else {
-        generate_platform_art_asset_with_runtime_options_at(
-            root,
-            prompt,
-            &[],
-            &options,
-            require_slices,
-            &runtime_context,
-        )
-        .await
-    };
+    let generation = generate_art_package_asset_with_runtime_options_at(
+        root,
+        prompt,
+        &[],
+        &options,
+        require_slices,
+        retain_runtime_state,
+        &runtime_context,
+    )
+    .await;
     let generated = match generation {
         Ok(generated) => generated,
         Err(error)

apps/ai-game-creator-shell/src-tauri/src/agent/generation.rs

@@ -18,8 +18,7 @@ pub(crate) use canvas_generation::submit_external_generation_request;
 pub(in crate::agent) use canvas_generation::{
     admit_platform_art_generation_at, commit_prepared_platform_art_asset_at,
     commit_prepared_platform_art_asset_strict_slices_at, generate_admitted_platform_art_asset_at,
-    generate_platform_art_asset_with_retained_runtime_options_at,
-    generate_platform_art_asset_with_runtime_options_at,
+    generate_art_package_asset_with_runtime_options_at,
     platform_art_generation_error_result_unknown, recover_persisted_visual_generation_options,
     register_existing_platform_art_slices_at, request_platform_art_asset_with_runtime_options_at,
     restore_platform_art_asset_bytes_at,

apps/ai-game-creator-shell/src-tauri/src/agent/generation/canvas_generation.rs

@@ -2267,6 +2267,35 @@ fn decode_platform_art_image_bytes_with_limits(
         .map_err(|error| format!("{label}无法在安全内存边界内解码：{error}"))
 }
 
+fn normalize_art_package_png(download: &mut CanvasResourceDownload) -> Result<(), String> {
+    if download.bytes.len() > PLATFORM_ART_SPRITESHEET_SINGLE_DOWNLOAD_BYTES {
+        return Err("美术包图片超过 20 MiB 本地校验上限".to_string());
+    }
+    let format = image::guess_format(&download.bytes)
+        .map_err(|error| format!("美术包图片无法识别格式：{error}"))?;
+    if !matches!(
+        format,
+        image::ImageFormat::Png | image::ImageFormat::Jpeg | image::ImageFormat::WebP
+    ) {
+        return Err("美术包图片仅支持 PNG、JPEG、WebP".to_string());
+    }
+    // PNG 也必须完整解码；保留原字节以兼容既有摘要和恢复记录。
+    let decoded = decode_platform_art_image_with_limits(download, "美术包图片")?;
+    if format != image::ImageFormat::Png {
+        let mut output = std::io::Cursor::new(Vec::new());
+        decoded
+            .write_to(&mut output, image::ImageFormat::Png)
+            .map_err(|error| format!("美术包图片转为 PNG 失败：{error}"))?;
+        let bytes = output.into_inner();
+        if bytes.len() > PLATFORM_ART_SPRITESHEET_SINGLE_DOWNLOAD_BYTES {
+            return Err("美术包图片转为 PNG 后超过 20 MiB 本地校验上限".to_string());
+        }
+        download.bytes = bytes;
+    }
+    download.media_type = "image/png".to_string();
+    Ok(())
+}
+
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub(in crate::agent) struct ValidatedPlatformArtPng {
     pub(in crate::agent) width: u32,
@@ -2555,6 +2584,7 @@ pub(in crate::agent) async fn generate_admitted_platform_art_asset_at(
         false,
         &context,
         Some(admission.guard),
+        false,
     )
     .await
 }
@@ -2735,20 +2765,19 @@ pub(in crate::agent) async fn generate_platform_art_asset_with_runtime_options_a
         false,
         runtime_context,
         None,
+        false,
     )
     .await
 }
 
-/// Installs a recovered or newly generated asset while retaining the durable
-/// request state. Package-level workflows use this to compensate local files
-/// after a later stage fails without losing the accepted operation identity or
-/// issuing another billable POST when the package is retried.
-pub(in crate::agent) async fn generate_platform_art_asset_with_retained_runtime_options_at(
+/// 美术包统一输出 PNG；重生成时保留账本，以便后续阶段失败后复用已付费结果。
+pub(in crate::agent) async fn generate_art_package_asset_with_runtime_options_at(
     root: &Path,
     prompt: &str,
     briefs: &[AgentGroupBrief],
     options: &PlatformArtAssetGenerationOptions,
     require_slices: bool,
+    retain_runtime_state: bool,
     runtime_context: &PlatformArtGenerationRuntimeContext,
 ) -> Result<GeneratedPlatformArtAsset, String> {
     generate_platform_art_asset_with_runtime_options_and_retention_at(
@@ -2757,9 +2786,10 @@ pub(in crate::agent) async fn generate_platform_art_asset_with_retained_runtime_
         briefs,
         options,
         require_slices,
-        true,
+        retain_runtime_state,
         runtime_context,
         None,
+        true,
     )
     .await
 }
@@ -2909,6 +2939,7 @@ async fn generate_platform_art_asset_with_runtime_options_and_retention_at(
     retain_runtime_state: bool,
     runtime_context: &PlatformArtGenerationRuntimeContext,
     admitted_guard: Option<super::external_generation_state::DurablePlatformArtGenerationGuard>,
+    normalize_package_png: bool,
 ) -> Result<GeneratedPlatformArtAsset, String> {
     if require_slices && options.asset_kind != GameCreationAppAssetKind::IconSpritesheet {
         return Err("严格游戏切片生成只允许 icon-spritesheet 资产类型".to_string());
@@ -2980,7 +3011,7 @@ async fn generate_platform_art_asset_with_runtime_options_and_retention_at(
         )?;
         recover_interrupted_strict_platform_art_transaction_locked_at(root, &recovery_lock)?;
     }
-    let prepared = request_platform_art_asset_with_runtime_options_at(
+    let mut prepared = request_platform_art_asset_with_runtime_options_at(
         root,
         prompt,
         briefs,
@@ -2988,6 +3019,21 @@ async fn generate_platform_art_asset_with_runtime_options_and_retention_at(
         Some(runtime_context),
     )
     .await?;
+    if normalize_package_png {
+        normalize_art_package_png(&mut prepared.download)?;
+        prepared.extension = "png".to_string();
+        if options.asset_kind == GameCreationAppAssetKind::IconSpritesheet
+            && prepared.download.bytes.len()
+                + prepared
+                    .slices
+                    .iter()
+                    .map(|slice| slice.download.bytes.len())
+                    .sum::<usize>()
+                > PLATFORM_ART_SPRITESHEET_TOTAL_DOWNLOAD_BYTES
+        {
+            return Err("美术包图集转码后与切片累计超过 32 MiB，已拒绝同步".to_string());
+        }
+    }
     prepared.validate_frozen_session()?;
     let lock = acquire_game_creator_agent_runtime_project_write_lock_with_wait(
         root,
@@ -10322,6 +10368,81 @@ mod canvas_generation_tests {
         rgba_test_png_with_quality(alpha, CompressionType::Fast, FilterType::Adaptive)
     }
 
+    fn art_package_test_image(format: image::ImageFormat) -> CanvasResourceDownload {
+        let image = image::DynamicImage::ImageRgb8(image::RgbImage::from_pixel(
+            2,
+            2,
+            image::Rgb([12, 34, 56]),
+        ));
+        let mut output = std::io::Cursor::new(Vec::new());
+        image.write_to(&mut output, format).expect("encode fixture");
+        CanvasResourceDownload {
+            bytes: output.into_inner(),
+            media_type: format.to_mime_type().to_string(),
+        }
+    }
+
+    #[test]
+    fn art_package_png_normalization_preserves_png_bytes_and_real_alpha() {
+        let mut png = rgba_test_png(120);
+        let original = png.bytes.clone();
+        png.media_type = "application/octet-stream".to_string();
+        normalize_art_package_png(&mut png).expect("validate existing PNG");
+        assert_eq!(png.bytes, original);
+        assert_eq!(png.media_type, "image/png");
+
+        let mut webp = std::io::Cursor::new(Vec::new());
+        image::load_from_memory(&original)
+            .unwrap()
+            .write_to(&mut webp, image::ImageFormat::WebP)
+            .unwrap();
+        let mut webp = CanvasResourceDownload {
+            bytes: webp.into_inner(),
+            media_type: "image/webp".to_string(),
+        };
+        normalize_art_package_png(&mut webp).unwrap();
+        let validated = validate_platform_art_png_bytes_with_limits(&webp.bytes, "test").unwrap();
+        assert!(validated.has_transparent_pixels && validated.has_visible_pixels);
+        assert_eq!(
+            validated.pixel_sha256,
+            validate_platform_art_png_bytes_with_limits(&original, "test")
+                .unwrap()
+                .pixel_sha256
+        );
+
+        let mut jpeg = art_package_test_image(image::ImageFormat::Jpeg);
+        normalize_art_package_png(&mut jpeg).unwrap();
+        let (transparent, visible, _) = platform_art_spritesheet_alpha_contract(&jpeg).unwrap();
+        assert!(!transparent, "JPEG 转码不能补造透明像素");
+        assert!(visible);
+    }
+
+    #[test]
+    fn art_package_png_normalization_rejects_invalid_or_oversized_images() {
+        let mut oversized = Vec::new();
+        PngEncoder::new(&mut oversized)
+            .write_image(
+                &vec![0; (PLATFORM_ART_SPRITESHEET_MAX_DIMENSION as usize + 1) * 4],
+                PLATFORM_ART_SPRITESHEET_MAX_DIMENSION + 1,
+                1,
+                ColorType::Rgba8.into(),
+            )
+            .unwrap();
+        for bytes in [
+            b"GIF89a".to_vec(),
+            b"\x89PNG\r\n\x1a\n".to_vec(),
+            vec![0xff, 0xd8, 0xff],
+            oversized,
+            vec![0; PLATFORM_ART_SPRITESHEET_SINGLE_DOWNLOAD_BYTES + 1],
+        ] {
+            let mut download = CanvasResourceDownload {
+                bytes,
+                media_type: "image/png".to_string(),
+            };
+            assert!(normalize_art_package_png(&mut download).is_err());
+        }
+    }
+
     fn rgba_test_png_with_quality(
         alpha: u8,
         compression: CompressionType,
@@ -11007,6 +11128,16 @@ mod canvas_generation_tests {
 
     #[tokio::test]
     async fn retained_runtime_generation_retries_a_completed_stage_without_posting_again() {
+        for format in [
+            image::ImageFormat::Png,
+            image::ImageFormat::Jpeg,
+            image::ImageFormat::WebP,
+        ] {
+            assert_art_package_recovers_completed_stage(format).await;
+        }
+    }
+
+    async fn assert_art_package_recovers_completed_stage(format: image::ImageFormat) {
         let temporary = tempfile::tempdir().expect("create retained runtime project");
         let root = temporary.path();
         init_local_game_project_at(root, "retained-runtime", "整包阶段恢复")
@@ -11014,12 +11145,14 @@ mod canvas_generation_tests {
         let listener =
             std::net::TcpListener::bind("127.0.0.1:0").expect("bind retained download fixture");
         let base_url = format!("http://{}", listener.local_addr().expect("fixture address"));
-        let image_url = format!("{base_url}/retained.png");
+        let extension = format.extensions_str()[0];
+        let image_url = format!("{base_url}/retained.{extension}");
         let signed_image_url = image_url.clone();
-        let png = rgba_test_png(u8::MAX).bytes;
+        let source = art_package_test_image(format);
+        let source_bytes = source.bytes.clone();
         let (request_sender, request_receiver) = std::sync::mpsc::channel();
         let server = std::thread::spawn(move || {
-            for _ in 0..4 {
+            for request_index in 0..6 {
                 let (mut stream, _) = listener.accept().expect("accept retained download");
                 let request = read_test_http_request(&mut stream);
                 request_sender
@@ -11038,12 +11171,19 @@ mod canvas_generation_tests {
                     )
                     .expect("write retained signed URL");
                 } else {
+                    // 首次下载有合法签名但内容损坏，重试必须仍使用同一已完成账本。
+                    let bytes = if request_index == 1 {
+                        &source.bytes[..16]
+                    } else {
+                        &source.bytes
+                    };
                     write!(
                         stream,
-                        "HTTP/1.1 200 OK\r\nContent-Type: image/png\r\nContent-Length: {}\r\nConnection: close\r\n\r\n",
-                        png.len()
+                        "HTTP/1.1 200 OK\r\nContent-Type: {}\r\nContent-Length: {}\r\nConnection: close\r\n\r\n",
+                        source.media_type,
+                        bytes.len()
                     )
-                    .and_then(|_| stream.write_all(&png))
+                    .and_then(|_| stream.write_all(bytes))
                     .expect("write retained image");
                 }
             }
@@ -11102,7 +11242,7 @@ mod canvas_generation_tests {
                 "resource": {
                     "resourceId": "retained-resource",
                     "projectId": "retained-canvas-project",
-                    "objectKey": "retained/spec.png",
+                    "objectKey": format!("retained/spec.{extension}"),
                     "imageSrc": image_url
                 },
                 "taskId": "retained-task",
@@ -11118,21 +11258,76 @@ mod canvas_generation_tests {
                 "retained-runtime-key".to_string(),
             ),
             async {
-                for _ in 0..2 {
-                    generate_platform_art_asset_with_retained_runtime_options_at(
+                let ledger_before =
+                    read_platform_art_generation_runtime_state(root, &runtime_context)
+                        .unwrap()
+                        .unwrap();
+                let failure = generate_art_package_asset_with_runtime_options_at(
+                    root,
+                    prompt,
+                    &[],
+                    &options,
+                    false,
+                    false,
+                    &runtime_context,
+                )
+                .await;
+                assert!(failure.is_err());
+                assert!(!root.join("assets/art-spec.png").exists());
+                assert!(read_manifest_for_project(root).unwrap().assets.is_empty());
+                let ledger_after =
+                    read_platform_art_generation_runtime_state(root, &runtime_context)
+                        .unwrap()
+                        .unwrap();
+                assert_eq!(
+                    platform_art_generation_runtime_idempotency_key(&ledger_before),
+                    platform_art_generation_runtime_idempotency_key(&ledger_after)
+                );
+                assert_eq!(
+                    platform_art_generation_runtime_retained_result(&ledger_before),
+                    platform_art_generation_runtime_retained_result(&ledger_after)
+                );
+                let mut installed_bytes = None;
+                let mut installed_asset_id = None;
+                for retain in [true, false] {
+                    generate_art_package_asset_with_runtime_options_at(
                         root,
                         prompt,
                         &[],
                         &options,
                         false,
+                        retain,
                         &runtime_context,
                     )
                     .await
                     .expect("recover retained completed stage");
-                    assert!(
+                    let bytes = fs::read(root.join("assets/art-spec.png")).unwrap();
+                    let validated =
+                        validate_platform_art_png_bytes_with_limits(&bytes, "recovered").unwrap();
+                    assert_eq!((validated.width, validated.height), (2, 2));
+                    if format == image::ImageFormat::Png {
+                        assert_eq!(bytes, source_bytes);
+                    }
+                    if let Some(previous) = installed_bytes.replace(bytes) {
+                        assert_eq!(installed_bytes.as_ref().unwrap(), &previous);
+                    }
+                    let manifest = read_manifest_for_project(root).unwrap();
+                    assert_eq!(manifest.assets.len(), 1);
+                    let asset = &manifest.assets[0];
+                    assert_eq!(asset.local_path, "assets/art-spec.png");
+                    assert_eq!(asset.media_type, "image/png");
+                    assert_eq!(
+                        asset.source.resource_id.as_deref(),
+                        Some("retained-resource")
+                    );
+                    if let Some(previous) = installed_asset_id.replace(asset.id.clone()) {
+                        assert_eq!(asset.id, previous);
+                    }
+                    assert_eq!(
                         read_platform_art_generation_runtime_state(root, &runtime_context)
                             .expect("read retained stage ledger")
-                            .is_some()
+                            .is_some(),
+                        retain
                     );
                 }
             },
@@ -11145,13 +11340,13 @@ mod canvas_generation_tests {
                 .ok()
         })
         .collect::<Vec<_>>();
-        assert_eq!(requests.len(), 4);
+        assert_eq!(requests.len(), 6);
         assert_eq!(
             requests
                 .iter()
-                .filter(|request| request.starts_with("GET /retained.png "))
+                .filter(|request| request.starts_with(&format!("GET /retained.{extension} ")))
                 .count(),
-            2
+            3
         );
         assert!(requests.iter().all(|request| request.starts_with("GET ")));
         assert!(requests.iter().all(|request| !request.starts_with("POST ")));

docs/project-memory/shared-memory/pitfalls.md

@@ -1,5 +1,11 @@
 # 踩坑与排障记录
 
+## 美术包固定 PNG 路径与平台返回格式不一致
+
+- 平台生成成功仍可能返回 JPEG/WebP；直接按 `assets/art-spec.png` 等固定路径保存会在扩展名校验时失败，图片尚未落盘但已付费结果账本仍存在，不能据 manifest 为空认定没有生成结果。
+- 美术包专用入口在本地提交前有界解码并归一化为 PNG，原 PNG 字节不变；扩展名、MIME、内容摘要和恢复比较必须使用同一份最终字节。普通图片工具和独立切片的格式合同不随之放宽，转码也不能代替真实透明度校验。
+- 失败后保留原账本并按冻结意图恢复，不能删除账本后重新生成。详情见 [AGC 美术包合同](../../technical/【技术方案】AI游戏创作智能体App实施计划-2026-06-24.md#2026-08-23-direct-codex-美术包显式重生成与切片投影)。
+
 ## 2026-09-24 AGC 生成路由迁移必须核对账号队列契约
 
 - AGC 普通账号会把 external editor 路由映射到站内入口；只验证 API Key 路由不足以证明客户端链路可用。

docs/technical/【技术方案】AI游戏创作智能体App实施计划-2026-06-24.md

@@ -1493,6 +1493,9 @@ game-project/
 
 ## 2026-08-23 Direct Codex 美术包显式重生成与切片投影
 
+- 标准美术包在客户端将规范图、背景图和主图集统一保存为 PNG：下载仍校验来源、声明类型与文件签名，随后按真实内容接受 PNG/JPEG/WebP，在已有 20 MiB、4096 像素单边和 64 MiB 解码内存限制内完整解码。有效 PNG 原样保留，JPEG/WebP 编码成 PNG，最终内容也不得超过 20 MiB；本地媒体类型固定为 `image/png`。转码不补造透明度，主图集与独立切片继续执行真实 alpha、可见像素、尺寸和唯一性合同；平台独立切片仍须为 PNG。此行为仅属于美术包，普通图片工具的指定扩展名合同不变。
+- 美术包的转码在项目提交锁和本地写入之前完成，文件摘要、已安装结果识别、替换恢复和 manifest 登记均使用最终 PNG。转码失败保留原生成账本与平台身份，同冻结意图重试重新读取已有结果，不提交新的付费生成；不改变请求快照、幂等身份、固定资源路径或旧 PNG 包的复用方式，无数据迁移。验收覆盖 JPEG/WebP 转码、PNG 字节不变、损坏/超限拒绝、真实透明度以及已有结果重复恢复零生成 POST；客户端真实 Provider 的整包验证单独记录。
+- 转码自动化验收由 `canvas_generation_tests` 的格式/边界用例和 `retained_runtime_generation_retries_a_completed_stage_without_posting_again` 本地 HTTP 夹具覆盖：PNG/JPEG/WebP 均先下载损坏内容，再从同一已完成账本恢复两次，核对最终 PNG、稳定本地 asset ID、Canvas 来源身份、账本保留/清理及零生成 POST；替换与补偿继续由现有图集事务和 Direct 重生成用例覆盖。真实 Provider 的客户端整包效果不由这些夹具替代。
 - `agc_tools.taonier_prepare_game_art` 的请求模式固定为 `reuse-or-create | regenerate`。缺省使用 `reuse-or-create`，完整且可信的本地包继续零付费复用；只有用户显式要求重做、替换或切换视觉风格时使用 `regenerate`，并绕过完整包短路，按规范图、背景图、透明图集顺序生成和原位替换。`regenerate` 的旧包前置门只要求规范图和背景图已经可下载、可解码、来源一致且存在可信 manifest 登记，使两项旧字节与登记可以完整 rollback；历史主图集、私有回执、公开清单或 canonical 切片可以缺失。客户端必须把八个严格路径的实际存在性和摘要，以及其中受管顶层 asset identity，逐项冻结为 `Present/Some` 或 `Missing/None`，不能把缺失状态伪造成空文件或虚假登记。规范图或背景图任一缺失或身份无效时才失败关闭并提示先用 `reuse-or-create` 修复基础素材。
 - 显式重生成不放宽 External Editor 幂等与未知态边界。固定阶段已有 `prepared / accepted` 账本时，本次生成 prompt 必须与账本冻结 prompt 一致才可恢复；不一致返回 `platform-generation-result-unknown` 并保留原 `Idempotency-Key / operationId` 对账，禁止把旧结果解释为新意图，也禁止另起付费 POST。
 - 整包重生成在首个付费阶段前建立客户端私有 v4 workflow，状态固定为 `resetting / in-progress / compensating / completed`，并同时绑定意图摘要和客户端稳定 `clientTurnId`。专用 `direct-codex-art` 跨进程执行锁覆盖整个付费重生成生命周期，但不持有通用项目写锁等待网络。规范图和背景图替换后立即持久化旧字节、旧 manifest entry 与本轮双 CAS 锚点；任一后续阶段失败时进入 `compensating`，可在进程重启后继续恢复旧文件及旧登记。已成功阶段的生成账本继续保留；`completed` 持久化经脱敏和数量 / 长度限制的完整工具结果，同一 `clientTurnId` 回包丢失时必须等值重放且零新 POST。新的显式用户回合先持久化目标回合所有的 `resetting` workflow，再清理上一轮三阶段账本并转回 `in-progress`，任一崩溃点都不得出现无 workflow 窗口。只有尚无任何阶段账本且无替换锚点的孤立 `in-progress` 空壳允许被新回合原子接管；其余身份冲突、未知版本以及缺少新恢复字段的旧 v2/v3 workflow 均失败关闭，不能用 serde 缺省值把旧状态升级成可执行状态。