feat(动画): 添加角色动作合成纹理功能

实现角色动作的离屏渲染合成功能，支持获取合成纹理及其相关信息：
1. 新增CanvasActor用于离屏渲染
2. 新增RenderTexture封装FBO和纹理
3. 扩展Renderer支持离屏渲染到纹理
4. 为CharacterAnimation添加合成纹理生成逻辑
5. 在调试界面添加合成纹理预览功能

Frostbite2D/include/frostbite2D/2d/canvas_actor.h

@@ -0,0 +1,64 @@
+#pragma once
+
+#include <frostbite2D/2d/sprite.h>
+#include <frostbite2D/graphics/camera.h>
+#include <frostbite2D/graphics/render_texture.h>
+#include <functional>
+
+namespace frostbite2D {
+
+/// @brief 离屏画布节点。
+///
+/// 子节点通过 `AddCanvasChild()` 挂到内部画布树，只会在重绘到离屏纹理时参与渲染，
+/// 不会像普通场景子节点那样直接显示到屏幕。
+class CanvasActor : public Sprite {
+public:
+  CanvasActor();
+  ~CanvasActor() override = default;
+
+  bool Init(int width, int height);
+  bool SetCanvasSize(int width, int height);
+  Vec2 GetCanvasSize() const {
+    return Vec2(static_cast<float>(canvasWidth_), static_cast<float>(canvasHeight_));
+  }
+
+  void SetClearColor(const Color& color);
+  const Color& GetClearColor() const { return clearColor_; }
+
+  void SetDirty();
+  bool IsDirty() const { return dirty_; }
+  bool Redraw();
+  void SetCustomDrawCallback(std::function<void()> callback);
+  void ClearCustomDrawCallback();
+
+  void AddCanvasChild(RefPtr<Actor> child);
+  void RemoveCanvasChild(RefPtr<Actor> child);
+  void RemoveAllCanvasChildren();
+  Actor* GetCanvasRoot() const { return canvasRoot_.Get(); }
+  ActorList& GetCanvasChildren() { return canvasRoot_->GetChildren(); }
+  const ActorList& GetCanvasChildren() const { return canvasRoot_->GetChildren(); }
+
+  Ptr<Texture> GetOutputTexture() const;
+  Ptr<RenderTexture> GetRenderTexture() const { return renderTexture_; }
+  bool IsCanvasReady() const { return renderTexture_ && renderTexture_->IsValid(); }
+  Camera& GetCanvasCamera() { return canvasCamera_; }
+  const Camera& GetCanvasCamera() const { return canvasCamera_; }
+
+  void OnUpdate(float deltaTime) override;
+  void Render() override;
+
+private:
+  bool redrawInternal();
+  void syncCanvasResources();
+
+  RefPtr<Actor> canvasRoot_;
+  Ptr<RenderTexture> renderTexture_ = nullptr;
+  Camera canvasCamera_;
+  Color clearColor_ = Colors::Transparent;
+  int canvasWidth_ = 0;
+  int canvasHeight_ = 0;
+  bool dirty_ = true;
+  std::function<void()> customDrawCallback_;
+};
+
+} // namespace frostbite2D

Frostbite2D/include/frostbite2D/animation/animation.h

@@ -44,6 +44,9 @@ public:
   void InterpolationLogic();
 
   Vec2 GetMaxSize() const;
+  bool GetStaticLocalBounds(Rect& outBounds) const;
+  bool GetStaticLocalBounds(int direction, Rect& outBounds) const;
+  uint64 GetRenderSignature() const;
 
   bool IsUsable() const { return usable_; }
   void SetUsable(bool usable) { usable_ = usable; }

Frostbite2D/include/frostbite2D/graphics/render_texture.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <frostbite2D/base/RefObject.h>
+#include <frostbite2D/graphics/texture.h>
+
+namespace frostbite2D {
+
+class Renderer;
+
+/// @brief 2D 离屏渲染目标，封装颜色纹理和对应的 framebuffer。
+class RenderTexture : public RefObject {
+public:
+  RenderTexture() = default;
+  ~RenderTexture() override;
+
+  bool Init(int width, int height);
+  bool Resize(int width, int height);
+  void Reset();
+
+  bool IsValid() const { return framebufferID_ != 0 && texture_ != nullptr; }
+  int GetWidth() const { return width_; }
+  int GetHeight() const { return height_; }
+  Ptr<Texture> GetTexture() const { return texture_; }
+
+private:
+  Ptr<Texture> texture_ = nullptr;
+  uint32 framebufferID_ = 0;
+  int width_ = 0;
+  int height_ = 0;
+
+  friend class Renderer;
+};
+
+} // namespace frostbite2D

Frostbite2D/include/frostbite2D/graphics/renderer.h

@@ -9,9 +9,12 @@
 #include <frostbite2D/graphics/texture.h>
 #include <frostbite2D/graphics/types.h>
 #include <string>
+#include <vector>
 
 namespace frostbite2D {
 
+class RenderTexture;
+
 class Renderer {
 public:
   static Renderer& get();
@@ -22,6 +25,10 @@ public:
   void beginFrame();
   void endFrame();
   void flush();
+  bool beginRenderToTexture(RenderTexture& target, Camera* camera,
+                            const Color& clearColor = Color(0.0f, 0.0f, 0.0f, 0.0f),
+                            bool clear = true);
+  bool endRenderToTexture();
 
   void setViewport(int x, int y, int width, int height);
   void setWindowSize(int width, int height, float contentScaleX = 1.0f,
@@ -61,6 +68,9 @@ public:
   const RenderResolutionState& getResolutionState() const {
     return resolutionState_;
   }
+  bool isInitialized() const { return initialized_; }
+  bool isFrameActive() const { return frameActive_; }
+  bool isRenderingToTexture() const { return !renderTargetStack_.empty(); }
   Vec2 screenToVirtual(const Vec2& screenPos) const;
   Vec2 virtualToScreen(const Vec2& virtualPos) const;
 
@@ -107,6 +117,17 @@ private:
   void recalculateResolutionState();
   void syncCameraViewport();
 
+  struct RenderTargetState {
+    uint32 framebuffer = 0;
+    int viewportX = 0;
+    int viewportY = 0;
+    int viewportWidth = 1;
+    int viewportHeight = 1;
+    float clearColor[4] = {0.0f, 0.0f, 0.0f, 0.0f};
+    Camera* camera = nullptr;
+    bool startedStandaloneBatch = false;
+  };
+
   ShaderManager shaderManager_;
   Batch batch_;
   Camera* camera_ = nullptr;
@@ -123,6 +144,8 @@ private:
   RenderResolutionState resolutionState_;
 
   bool initialized_ = false;
+  bool frameActive_ = false;
+  std::vector<RenderTargetState> renderTargetStack_;
 
   Renderer(const Renderer&) = delete;
   Renderer& operator=(const Renderer&) = delete;

Frostbite2D/src/frostbite2D/2d/canvas_actor.cpp

@@ -0,0 +1,141 @@
+#include <frostbite2D/2d/canvas_actor.h>
+#include <frostbite2D/graphics/renderer.h>
+#include <algorithm>
+
+namespace frostbite2D {
+
+CanvasActor::CanvasActor() {
+  canvasRoot_ = MakePtr<Actor>();
+  canvasRoot_->SetName("canvasRoot");
+}
+
+bool CanvasActor::Init(int width, int height) {
+  return SetCanvasSize(width, height);
+}
+
+bool CanvasActor::SetCanvasSize(int width, int height) {
+  width = std::max(width, 1);
+  height = std::max(height, 1);
+
+  if (!renderTexture_) {
+    renderTexture_ = MakePtr<RenderTexture>();
+  }
+
+  if (!renderTexture_->Resize(width, height)) {
+    return false;
+  }
+
+  canvasWidth_ = width;
+  canvasHeight_ = height;
+  canvasCamera_.setPosition(Vec2::Zero());
+  canvasCamera_.setZoom(1.0f);
+  canvasCamera_.setViewport(canvasWidth_, canvasHeight_);
+
+  syncCanvasResources();
+  dirty_ = true;
+  return true;
+}
+
+void CanvasActor::SetClearColor(const Color& color) {
+  clearColor_ = color;
+  dirty_ = true;
+}
+
+void CanvasActor::SetDirty() {
+  dirty_ = true;
+}
+
+bool CanvasActor::Redraw() {
+  dirty_ = true;
+  return redrawInternal();
+}
+
+void CanvasActor::SetCustomDrawCallback(std::function<void()> callback) {
+  customDrawCallback_ = std::move(callback);
+  dirty_ = true;
+}
+
+void CanvasActor::ClearCustomDrawCallback() {
+  if (!customDrawCallback_) {
+    return;
+  }
+
+  customDrawCallback_ = nullptr;
+  dirty_ = true;
+}
+
+void CanvasActor::AddCanvasChild(RefPtr<Actor> child) {
+  if (!child || child.Get() == this) {
+    return;
+  }
+
+  canvasRoot_->AddChild(child);
+  dirty_ = true;
+}
+
+void CanvasActor::RemoveCanvasChild(RefPtr<Actor> child) {
+  if (!child) {
+    return;
+  }
+
+  canvasRoot_->RemoveChild(child);
+  dirty_ = true;
+}
+
+void CanvasActor::RemoveAllCanvasChildren() {
+  canvasRoot_->RemoveAllChildren();
+  dirty_ = true;
+}
+
+Ptr<Texture> CanvasActor::GetOutputTexture() const {
+  return renderTexture_ ? renderTexture_->GetTexture() : nullptr;
+}
+
+void CanvasActor::OnUpdate(float deltaTime) {
+  if (canvasRoot_) {
+    canvasRoot_->Update(deltaTime);
+  }
+}
+
+void CanvasActor::Render() {
+  if (dirty_) {
+    redrawInternal();
+  }
+
+  Sprite::Render();
+}
+
+bool CanvasActor::redrawInternal() {
+  if (!renderTexture_ || !renderTexture_->IsValid()) {
+    return false;
+  }
+
+  Renderer& renderer = Renderer::get();
+  if (!renderer.beginRenderToTexture(*renderTexture_, &canvasCamera_, clearColor_)) {
+    dirty_ = true;
+    return false;
+  }
+
+  if (canvasRoot_) {
+    canvasRoot_->Render();
+  }
+  if (customDrawCallback_) {
+    customDrawCallback_();
+  }
+
+  renderer.endRenderToTexture();
+  dirty_ = false;
+  return true;
+}
+
+void CanvasActor::syncCanvasResources() {
+  Ptr<Texture> outputTexture = renderTexture_ ? renderTexture_->GetTexture() : nullptr;
+  if (outputTexture) {
+    outputTexture->setSampling(TextureSampling::PixelArt);
+  }
+
+  SetTexture(outputTexture);
+  SetSize(static_cast<float>(canvasWidth_), static_cast<float>(canvasHeight_));
+}
+
+} // namespace frostbite2D

Frostbite2D/src/frostbite2D/animation/animation.cpp

@@ -12,6 +12,46 @@ using namespace frostbite2D::animation;
 namespace frostbite2D {
 namespace {
 
+struct BoundsAccumulator {
+  bool valid = false;
+  float minX = 0.0f;
+  float minY = 0.0f;
+  float maxX = 0.0f;
+  float maxY = 0.0f;
+
+  void includePoint(const Vec2& point) {
+    if (!valid) {
+      minX = maxX = point.x;
+      minY = maxY = point.y;
+      valid = true;
+      return;
+    }
+
+    minX = std::min(minX, point.x);
+    minY = std::min(minY, point.y);
+    maxX = std::max(maxX, point.x);
+    maxY = std::max(maxY, point.y);
+  }
+
+  void includeRect(const Rect& rect) {
+    if (rect.empty()) {
+      return;
+    }
+
+    includePoint(Vec2(rect.left(), rect.top()));
+    includePoint(Vec2(rect.right(), rect.top()));
+    includePoint(Vec2(rect.left(), rect.bottom()));
+    includePoint(Vec2(rect.right(), rect.bottom()));
+  }
+
+  Rect toRect() const {
+    if (!valid) {
+      return Rect();
+    }
+    return Rect(minX, minY, maxX - minX, maxY - minY);
+  }
+};
+
 Vec2 resolveFramePosition(const AniFrame& frameInfo, const Vec2& imageRate) {
   return Vec2(frameInfo.imgPos.x * imageRate.x, frameInfo.imgPos.y * imageRate.y);
 }
@@ -37,6 +77,64 @@ BlendMode resolveBlendMode(const AniFrame& frameInfo) {
   return BlendMode::Normal;
 }
 
+Rect transformRectBounds(const Rect& rect, const Transform2D& transform) {
+  BoundsAccumulator bounds;
+  bounds.includePoint(transform.transformPoint(Vec2(rect.left(), rect.top())));
+  bounds.includePoint(transform.transformPoint(Vec2(rect.right(), rect.top())));
+  bounds.includePoint(transform.transformPoint(Vec2(rect.left(), rect.bottom())));
+  bounds.includePoint(transform.transformPoint(Vec2(rect.right(), rect.bottom())));
+  return bounds.toRect();
+}
+
+bool computeAnimationFrameBounds(const Animation& animation,
+                                 int frameIndex,
+                                 int direction,
+                                 Rect& outBounds) {
+  if (frameIndex < 0 ||
+      frameIndex >= static_cast<int>(animation.frames_.size()) ||
+      frameIndex >= static_cast<int>(animation.spriteFrames_.size()) ||
+      frameIndex >= static_cast<int>(animation.spriteFrameOffsets_.size())) {
+    return false;
+  }
+
+  const AniFrame& frameInfo = animation.frames_[frameIndex];
+  const auto& sprite = animation.spriteFrames_[frameIndex];
+  if (!sprite) {
+    return false;
+  }
+
+  Vec2 spriteSize = sprite->GetSize();
+  if (spriteSize.x <= 0.0f || spriteSize.y <= 0.0f) {
+    return false;
+  }
+
+  Vec2 imageRate = resolveImageRate(frameInfo);
+  float rotation = resolveFrameRotation(frameInfo);
+  Vec2 framePos = resolveFramePosition(frameInfo, imageRate);
+  Vec2 offset = animation.spriteFrameOffsets_[frameIndex];
+  float mirroredRotation = rotation;
+  if (direction < 0) {
+    float visualWidth = spriteSize.x * std::abs(imageRate.x);
+    framePos.x = -framePos.x;
+    offset.x = -offset.x - visualWidth;
+    mirroredRotation = -rotation;
+  }
+
+  Transform2D transform =
+      Transform2D::translation(offset) *
+      Transform2D::translation(framePos) *
+      Transform2D::rotation(mirroredRotation) *
+      Transform2D::scaling(imageRate.x, imageRate.y);
+  outBounds = transformRectBounds(Rect(0.0f, 0.0f, spriteSize.x, spriteSize.y),
+                                  transform);
+  return !outBounds.empty();
+}
+
+void combineHash(uint64& seed, uint64 value) {
+  constexpr uint64 kOffset = 0x9e3779b97f4a7c15ULL;
+  seed ^= value + kOffset + (seed << 6) + (seed >> 2);
+}
+
 } // namespace
 
 Animation::Animation() {
@@ -346,6 +444,66 @@ Vec2 Animation::GetMaxSize() const {
   return maxSize_;
 }
 
+bool Animation::GetStaticLocalBounds(Rect& outBounds) const {
+  BoundsAccumulator bounds;
+  Rect directionalBounds;
+  if (GetStaticLocalBounds(1, directionalBounds)) {
+    bounds.includeRect(directionalBounds);
+  }
+  if (GetStaticLocalBounds(-1, directionalBounds)) {
+    bounds.includeRect(directionalBounds);
+  }
+
+  outBounds = bounds.toRect();
+  return bounds.valid;
+}
+
+bool Animation::GetStaticLocalBounds(int direction, Rect& outBounds) const {
+  BoundsAccumulator bounds;
+
+  for (int i = 0; i < static_cast<int>(frames_.size()); ++i) {
+    Rect frameBounds;
+    if (computeAnimationFrameBounds(*this, i, direction, frameBounds)) {
+      bounds.includeRect(frameBounds);
+    }
+  }
+
+  for (const auto& child : GetChildren()) {
+    auto* subAnimation = dynamic_cast<Animation*>(child.Get());
+    if (!subAnimation) {
+      continue;
+    }
+
+    Rect childBounds;
+    if (!subAnimation->GetStaticLocalBounds(direction, childBounds)) {
+      continue;
+    }
+
+    bounds.includeRect(transformRectBounds(childBounds, subAnimation->GetLocalTransform()));
+  }
+
+  outBounds = bounds.toRect();
+  return bounds.valid;
+}
+
+uint64 Animation::GetRenderSignature() const {
+  uint64 signature = 1469598103934665603ULL;
+  combineHash(signature, static_cast<uint64>(usable_));
+  combineHash(signature, static_cast<uint64>(direction_ >= 0 ? 1 : 0));
+  combineHash(signature, static_cast<uint64>(std::max(currentFrameIndex_, 0)));
+  combineHash(signature, static_cast<uint64>(std::max(totalFrameCount_, 0)));
+
+  for (const auto& child : GetChildren()) {
+    auto* subAnimation = dynamic_cast<Animation*>(child.Get());
+    if (!subAnimation) {
+      continue;
+    }
+    combineHash(signature, subAnimation->GetRenderSignature());
+  }
+
+  return signature;
+}
+
 void Animation::ApplyFramePresentation(const Vec2& framePos,
                                        const Vec2& imageRate,
                                        float rotation,

Frostbite2D/src/frostbite2D/graphics/render_texture.cpp

@@ -0,0 +1,67 @@
+#include <frostbite2D/graphics/render_texture.h>
+#include <SDL2/SDL.h>
+#include <algorithm>
+#include <glad/glad.h>
+
+namespace frostbite2D {
+
+RenderTexture::~RenderTexture() {
+  Reset();
+}
+
+bool RenderTexture::Init(int width, int height) {
+  return Resize(width, height);
+}
+
+bool RenderTexture::Resize(int width, int height) {
+  width = std::max(width, 1);
+  height = std::max(height, 1);
+
+  if (framebufferID_ != 0 && texture_ && width_ == width && height_ == height) {
+    return true;
+  }
+
+  Reset();
+
+  texture_ = Texture::createEmpty(width, height);
+  if (!texture_) {
+    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+                 "RenderTexture: failed to create color texture %dx%d",
+                 width, height);
+    return false;
+  }
+
+  glGenFramebuffers(1, &framebufferID_);
+  glBindFramebuffer(GL_FRAMEBUFFER, framebufferID_);
+  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                         texture_->getID(), 0);
+
+  GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+  glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+  if (status != GL_FRAMEBUFFER_COMPLETE) {
+    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+                 "RenderTexture: framebuffer incomplete (status=0x%x)",
+                 static_cast<unsigned int>(status));
+    Reset();
+    return false;
+  }
+
+  width_ = width;
+  height_ = height;
+  return true;
+}
+
+void RenderTexture::Reset() {
+  texture_.Reset();
+
+  if (framebufferID_ != 0) {
+    glDeleteFramebuffers(1, &framebufferID_);
+    framebufferID_ = 0;
+  }
+
+  width_ = 0;
+  height_ = 0;
+}
+
+} // namespace frostbite2D

Frostbite2D/src/frostbite2D/graphics/renderer.cpp

@@ -3,6 +3,7 @@
 #include <algorithm>
 #include <cmath>
 #include <frostbite2D/graphics/renderer.h>
+#include <frostbite2D/graphics/render_texture.h>
 #include <glad/glad.h>
 #include <glm/gtc/type_ptr.hpp>
 
@@ -60,9 +61,11 @@ bool Renderer::init() {
 }
 
 void Renderer::shutdown() {
+  renderTargetStack_.clear();
   batch_.shutdown();
   shaderManager_.shutdown();
   initialized_ = false;
+  frameActive_ = false;
 }
 
 void Renderer::beginFrame() {
@@ -74,16 +77,109 @@ void Renderer::beginFrame() {
 
   updateUniforms();
   batch_.begin();
+  frameActive_ = true;
 }
 
 void Renderer::endFrame() {
+  while (!renderTargetStack_.empty()) {
+    SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
+                "Renderer: endFrame() auto-closing unfinished render target scope");
+    endRenderToTexture();
+  }
   batch_.end();
+  frameActive_ = false;
 }
 
 void Renderer::flush() {
   batch_.flush();
 }
 
+bool Renderer::beginRenderToTexture(RenderTexture& target, Camera* camera,
+                                    const Color& clearColor, bool clear) {
+  if (!initialized_) {
+    SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
+                "Renderer: beginRenderToTexture called before renderer init");
+    return false;
+  }
+  if (!target.IsValid()) {
+    SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
+                "Renderer: beginRenderToTexture called with invalid target");
+    return false;
+  }
+
+  Camera* activeCamera = camera ? camera : camera_;
+  if (!activeCamera) {
+    SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
+                "Renderer: beginRenderToTexture requires an active camera");
+    return false;
+  }
+
+  RenderTargetState state;
+  GLint framebufferBinding = 0;
+  GLint viewport[4] = {};
+  GLfloat clearColorValue[4] = {};
+  glGetIntegerv(GL_FRAMEBUFFER_BINDING, &framebufferBinding);
+  glGetIntegerv(GL_VIEWPORT, viewport);
+  glGetFloatv(GL_COLOR_CLEAR_VALUE, clearColorValue);
+  state.framebuffer = static_cast<uint32>(framebufferBinding);
+  state.viewportX = viewport[0];
+  state.viewportY = viewport[1];
+  state.viewportWidth = std::max(viewport[2], 1);
+  state.viewportHeight = std::max(viewport[3], 1);
+  state.clearColor[0] = clearColorValue[0];
+  state.clearColor[1] = clearColorValue[1];
+  state.clearColor[2] = clearColorValue[2];
+  state.clearColor[3] = clearColorValue[3];
+  state.camera = camera_;
+
+  if (frameActive_ || !renderTargetStack_.empty()) {
+    batch_.flush();
+  } else {
+    batch_.begin();
+    state.startedStandaloneBatch = true;
+  }
+
+  renderTargetStack_.push_back(state);
+
+  glBindFramebuffer(GL_FRAMEBUFFER, target.framebufferID_);
+  glViewport(0, 0, std::max(target.width_, 1), std::max(target.height_, 1));
+  if (clear) {
+    glClearColor(clearColor.r, clearColor.g, clearColor.b, clearColor.a);
+    glClear(GL_COLOR_BUFFER_BIT);
+  }
+
+  camera_ = activeCamera;
+  updateUniforms();
+  return true;
+}
+
+bool Renderer::endRenderToTexture() {
+  if (renderTargetStack_.empty()) {
+    SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
+                "Renderer: endRenderToTexture called without matching begin");
+    return false;
+  }
+
+  RenderTargetState state = renderTargetStack_.back();
+  renderTargetStack_.pop_back();
+
+  if (state.startedStandaloneBatch) {
+    batch_.end();
+  } else {
+    batch_.flush();
+  }
+
+  glBindFramebuffer(GL_FRAMEBUFFER, state.framebuffer);
+  glViewport(state.viewportX, state.viewportY, state.viewportWidth,
+             state.viewportHeight);
+  glClearColor(state.clearColor[0], state.clearColor[1], state.clearColor[2],
+               state.clearColor[3]);
+
+  camera_ = state.camera;
+  updateUniforms();
+  return true;
+}
+
 void Renderer::setViewport(int x, int y, int width, int height) {
   resolutionState_.viewportX = x;
   resolutionState_.viewportY = y;

Game/include/character/CharacterAnimation.h

@@ -3,6 +3,7 @@
 #include "character/CharacterDataLoader.h"
 #include "character/CharacterEquipmentManager.h"
 #include <frostbite2D/2d/actor.h>
+#include <frostbite2D/2d/canvas_actor.h>
 #include <frostbite2D/animation/animation.h>
 #include <frostbite2D/base/RefPtr.h>
 #include <functional>
@@ -21,9 +22,20 @@ public:
   using ActionFrameFlagCallback = std::function<void(int)>;
   using ActionEndCallback = std::function<void()>;
 
+  struct CompositeFrameInfo {
+    bool valid = false;
+    Rect localBounds;
+    Vec2 originInTexture = Vec2::Zero();
+    Vec2 groundAnchorInTexture = Vec2::Zero();
+    int width = 1;
+    int height = 1;
+  };
+
   bool Init(CharacterObject* parent,
             const character::CharacterConfig& config,
             const CharacterEquipmentManager& equipmentManager);
+  void Update(float deltaTime) override;
+  void Render() override;
 
   bool SetAction(const std::string& actionName);
   void SetDirection(int direction);
@@ -39,6 +51,12 @@ public:
   animation::AniFrame GetCurrentFrameInfo() const;
   void SetActionFrameFlagCallback(ActionFrameFlagCallback callback);
   void SetActionEndCallback(ActionEndCallback callback);
+  bool HasCompositeTexture() const;
+  Ptr<Texture> GetCompositeTexture() const;
+  Vec2 GetCompositeTextureSize() const;
+  Vec2 GetCompositeOriginInTexture() const;
+  Vec2 GetCompositeGroundAnchorInTexture() const;
+  uint64 GetCompositeVersion() const { return compositeVersion_; }
 
 private:
   static std::string FormatImgPath(std::string path, Animation::ReplaceData data);
@@ -46,6 +64,15 @@ private:
   Animation* GetCurrentPrimaryAnimation() const;
   void RefreshRuntimeCallbacks();
   bool shouldSkipMissingAnimation(const std::string& aniPath);
+  void BuildCompositeActionFrames();
+  CompositeFrameInfo ComputeCompositeFrameInfo(const std::vector<RefPtr<Animation>>& animations,
+                                               int direction) const;
+  CompositeFrameInfo GetCurrentCompositeFrameInfo() const;
+  uint64 CaptureCurrentRenderSignature() const;
+  void MarkCompositeDirty();
+  void UpdateCompositeCamera();
+  void RefreshCompositeTextureIfNeeded();
+  void RenderCurrentActionToCompositeCanvas();
 
   void CreateAnimationBySlot(const std::string& actionName,
                              const std::string& slotName,
@@ -61,6 +88,11 @@ private:
   ActionEndCallback actionEndCallback_;
   std::unordered_set<std::string> missingAnimationPaths_;
   size_t skippedMissingAnimationCount_ = 0;
+  RefPtr<CanvasActor> compositeCanvas_ = nullptr;
+  std::map<std::string, CompositeFrameInfo> compositeFrameInfoByAction_;
+  bool compositeDirty_ = true;
+  uint64 compositeVersion_ = 0;
+  uint64 lastCompositeSignature_ = 0;
 };
 
 } // namespace frostbite2D

Game/include/character/CharacterObject.h

@@ -141,6 +141,12 @@ public:
   int GetCurrentAnimationFrameCount() const;
   float GetCurrentAnimationProgressNormalized() const;
   animation::AniFrame GetCurrentAnimationFrameInfo() const;
+  bool HasCompositeTexture() const;
+  Ptr<Texture> GetCompositeTexture() const;
+  Vec2 GetCompositeTextureSize() const;
+  Vec2 GetCompositeOriginInTexture() const;
+  Vec2 GetCompositeGroundAnchorInTexture() const;
+  uint64 GetCompositeTextureVersion() const;
 
   /// @brief 绑定当前动作主动画的运行时回调，供后续脚本系统接入。
   void SetAnimationFrameFlagCallback(CharacterAnimation::ActionFrameFlagCallback callback);

Game/include/common/debug/GameDebugActor.h

@@ -1,12 +1,14 @@
 #pragma once
 
 #include <frostbite2D/2d/actor.h>
+#include <frostbite2D/2d/sprite.h>
 
 namespace frostbite2D {
 
 class CharacterObject;
 class GameMap;
 class NineSliceActor;
+class Sprite;
 class TextSprite;
 
 /**
@@ -33,6 +35,11 @@ public:
 private:
   void initOverlay();
   void updateOverlay();
+  void updateMapDebugHighlight();
+  void updateCompositePreview();
+  Vec2 computeScreenMatchedPreviewSize(const Vec2& textureSize) const;
+  void updateCompositePreviewMarker(const Vec2& textureSize, const Vec2& previewSize,
+                                    const Vec2& originInTexture);
   void setOverlayVisible(bool visible);
 
   GameDebugActor();
@@ -42,6 +49,13 @@ private:
   CharacterObject* trackedCharacter_ = nullptr;
   RefPtr<NineSliceActor> background_;
   RefPtr<TextSprite> coordText_;
+  RefPtr<TextSprite> actionText_;
+  RefPtr<TextSprite> compositeText_;
+  RefPtr<Sprite> compositePreview_;
+  RefPtr<Actor> compositeOriginMarker_;
+  CharacterObject* previewCharacter_ = nullptr;
+  uint64 previewCompositeVersion_ = 0;
+  bool previewTextureAvailable_ = false;
 };
 
 } // namespace frostbite2D

Game/src/character/CharacterAnimation.cpp

@@ -1,9 +1,11 @@
 #include "character/CharacterAnimation.h"
 #include "character/CharacterObject.h"
+#include <frostbite2D/graphics/renderer.h>
 #include <frostbite2D/resource/pvf_archive.h>
 #include <SDL2/SDL.h>
 #include <algorithm>
 #include <array>
+#include <cmath>
 #include <cstdio>
 #include <sstream>
 #include <utility>
@@ -32,6 +34,82 @@ std::string actionTail(const std::string& path) {
   return path.substr(slashPos);
 }
 
+struct BoundsAccumulator {
+  bool valid = false;
+  float minX = 0.0f;
+  float minY = 0.0f;
+  float maxX = 0.0f;
+  float maxY = 0.0f;
+
+  void includeRect(const Rect& rect) {
+    if (rect.empty()) {
+      return;
+    }
+
+    if (!valid) {
+      minX = rect.left();
+      minY = rect.top();
+      maxX = rect.right();
+      maxY = rect.bottom();
+      valid = true;
+      return;
+    }
+
+    minX = std::min(minX, rect.left());
+    minY = std::min(minY, rect.top());
+    maxX = std::max(maxX, rect.right());
+    maxY = std::max(maxY, rect.bottom());
+  }
+};
+
+Rect transformRectBounds(const Rect& rect, const Transform2D& transform) {
+  Vec2 p0 = transform.transformPoint(Vec2(rect.left(), rect.top()));
+  Vec2 p1 = transform.transformPoint(Vec2(rect.right(), rect.top()));
+  Vec2 p2 = transform.transformPoint(Vec2(rect.left(), rect.bottom()));
+  Vec2 p3 = transform.transformPoint(Vec2(rect.right(), rect.bottom()));
+
+  float minX = std::min(std::min(p0.x, p1.x), std::min(p2.x, p3.x));
+  float minY = std::min(std::min(p0.y, p1.y), std::min(p2.y, p3.y));
+  float maxX = std::max(std::max(p0.x, p1.x), std::max(p2.x, p3.x));
+  float maxY = std::max(std::max(p0.y, p1.y), std::max(p2.y, p3.y));
+  return Rect(minX, minY, maxX - minX, maxY - minY);
+}
+
+void combineHash(uint64& seed, uint64 value) {
+  constexpr uint64 kOffset = 0x9e3779b97f4a7c15ULL;
+  seed ^= value + kOffset + (seed << 6) + (seed >> 2);
+}
+
+CharacterAnimation::CompositeFrameInfo combineCompositeFrameInfo(
+    const CharacterAnimation::CompositeFrameInfo& lhs,
+    const CharacterAnimation::CompositeFrameInfo& rhs) {
+  if (!lhs.valid) {
+    return rhs;
+  }
+  if (!rhs.valid) {
+    return lhs;
+  }
+
+  float left = std::floor(std::min(lhs.localBounds.left(), rhs.localBounds.left()));
+  float top = std::floor(std::min(lhs.localBounds.top(), rhs.localBounds.top()));
+  float right = std::ceil(std::max(lhs.localBounds.right(), rhs.localBounds.right()));
+  float bottom =
+      std::ceil(std::max(lhs.localBounds.bottom(), rhs.localBounds.bottom()));
+
+  CharacterAnimation::CompositeFrameInfo result;
+  result.valid = true;
+  result.localBounds =
+      Rect(left, top, std::max(right - left, 1.0f), std::max(bottom - top, 1.0f));
+  result.width =
+      std::max(static_cast<int>(std::lround(result.localBounds.width())), 1);
+  result.height =
+      std::max(static_cast<int>(std::lround(result.localBounds.height())), 1);
+  result.originInTexture =
+      Vec2(-result.localBounds.left(), -result.localBounds.top());
+  result.groundAnchorInTexture = result.originInTexture;
+  return result;
+}
+
 } // namespace
 
 bool CharacterAnimation::Init(CharacterObject* parent,
@@ -45,6 +123,21 @@ bool CharacterAnimation::Init(CharacterObject* parent,
   direction_ = 1;
   actionFrameFlagCallback_ = nullptr;
   actionEndCallback_ = nullptr;
+  compositeCanvas_ = MakePtr<CanvasActor>();
+  compositeFrameInfoByAction_.clear();
+  compositeDirty_ = true;
+  compositeVersion_ = 0;
+  lastCompositeSignature_ = 0;
+
+  if (!compositeCanvas_->Init(1, 1)) {
+    SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
+                "CharacterAnimation: failed to initialize composite canvas");
+    compositeCanvas_.Reset();
+  } else {
+    compositeCanvas_->SetCustomDrawCallback([this]() {
+      RenderCurrentActionToCompositeCanvas();
+    });
+  }
 
   for (const auto& [actionName, actionPath] : config.animationPath) {
     for (const char* slotName : kAvatarParts) {
@@ -65,9 +158,27 @@ bool CharacterAnimation::Init(CharacterObject* parent,
             config.jobId);
   }
 
+  BuildCompositeActionFrames();
   return true;
 }
 
+void CharacterAnimation::Update(float deltaTime) {
+  Actor::Update(deltaTime);
+
+  uint64 renderSignature = CaptureCurrentRenderSignature();
+  if (renderSignature != lastCompositeSignature_) {
+    compositeDirty_ = true;
+  }
+}
+
+void CharacterAnimation::Render() {
+  if (compositeDirty_ && compositeCanvas_ && Renderer::get().isFrameActive()) {
+    RefreshCompositeTextureIfNeeded();
+  }
+
+  Actor::Render();
+}
+
 std::string CharacterAnimation::FormatImgPath(std::string path, Animation::ReplaceData data) {
   size_t pos = path.find("%04d");
   if (pos != std::string::npos) {
@@ -262,6 +373,7 @@ bool CharacterAnimation::SetAction(const std::string& actionName) {
   currentActionTag_ = actionName;
   RefreshRuntimeCallbacks();
   SetDirection(direction_);
+  MarkCompositeDirty();
   return true;
 }
 
@@ -278,6 +390,8 @@ void CharacterAnimation::SetDirection(int direction) {
       animation->SetDirection(direction_);
     }
   }
+
+  MarkCompositeDirty();
 }
 
 bool CharacterAnimation::IsCurrentActionFinished() const {
@@ -327,4 +441,158 @@ void CharacterAnimation::SetActionEndCallback(ActionEndCallback callback) {
   RefreshRuntimeCallbacks();
 }
 
+bool CharacterAnimation::HasCompositeTexture() const {
+  return compositeCanvas_ && compositeCanvas_->IsCanvasReady() &&
+         GetCurrentCompositeFrameInfo().valid;
+}
+
+Ptr<Texture> CharacterAnimation::GetCompositeTexture() const {
+  return compositeCanvas_ ? compositeCanvas_->GetOutputTexture() : nullptr;
+}
+
+Vec2 CharacterAnimation::GetCompositeTextureSize() const {
+  CompositeFrameInfo info = GetCurrentCompositeFrameInfo();
+  return Vec2(static_cast<float>(info.width), static_cast<float>(info.height));
+}
+
+Vec2 CharacterAnimation::GetCompositeOriginInTexture() const {
+  return GetCurrentCompositeFrameInfo().originInTexture;
+}
+
+Vec2 CharacterAnimation::GetCompositeGroundAnchorInTexture() const {
+  return GetCurrentCompositeFrameInfo().groundAnchorInTexture;
+}
+
+CharacterAnimation::CompositeFrameInfo CharacterAnimation::ComputeCompositeFrameInfo(
+    const std::vector<RefPtr<Animation>>& animations, int direction) const {
+  CompositeFrameInfo info;
+  BoundsAccumulator bounds;
+
+  for (const auto& animation : animations) {
+    if (!animation) {
+      continue;
+    }
+
+    Rect animationBounds;
+    if (!animation->GetStaticLocalBounds(direction, animationBounds)) {
+      continue;
+    }
+
+    bounds.includeRect(
+        transformRectBounds(animationBounds, animation->GetLocalTransform()));
+  }
+
+  if (!bounds.valid) {
+    return info;
+  }
+
+  float left = std::floor(bounds.minX);
+  float top = std::floor(bounds.minY);
+  float right = std::ceil(bounds.maxX);
+  float bottom = std::ceil(bounds.maxY);
+
+  info.valid = true;
+  info.localBounds = Rect(left, top, std::max(right - left, 1.0f),
+                          std::max(bottom - top, 1.0f));
+  info.width = std::max(static_cast<int>(std::lround(info.localBounds.width())), 1);
+  info.height = std::max(static_cast<int>(std::lround(info.localBounds.height())), 1);
+  info.originInTexture = Vec2(-info.localBounds.left(), -info.localBounds.top());
+  info.groundAnchorInTexture = info.originInTexture;
+  return info;
+}
+
+void CharacterAnimation::BuildCompositeActionFrames() {
+  compositeFrameInfoByAction_.clear();
+  for (const auto& [actionName, animations] : actionAnimations_) {
+    CompositeFrameInfo rightInfo = ComputeCompositeFrameInfo(animations, 1);
+    CompositeFrameInfo leftInfo = ComputeCompositeFrameInfo(animations, -1);
+    compositeFrameInfoByAction_[actionName] =
+        combineCompositeFrameInfo(rightInfo, leftInfo);
+  }
+}
+
+CharacterAnimation::CompositeFrameInfo CharacterAnimation::GetCurrentCompositeFrameInfo() const {
+  auto it = compositeFrameInfoByAction_.find(currentActionTag_);
+  if (it == compositeFrameInfoByAction_.end()) {
+    return CompositeFrameInfo();
+  }
+  return it->second;
+}
+
+uint64 CharacterAnimation::CaptureCurrentRenderSignature() const {
+  uint64 signature = 1469598103934665603ULL;
+  combineHash(signature, static_cast<uint64>(direction_ >= 0 ? 1 : 0));
+  combineHash(signature, static_cast<uint64>(std::hash<std::string>{}(currentActionTag_)));
+
+  auto currentIt = actionAnimations_.find(currentActionTag_);
+  if (currentIt == actionAnimations_.end()) {
+    return signature;
+  }
+
+  for (const auto& animation : currentIt->second) {
+    if (!animation) {
+      continue;
+    }
+    combineHash(signature, animation->GetRenderSignature());
+  }
+
+  return signature;
+}
+
+void CharacterAnimation::MarkCompositeDirty() {
+  compositeDirty_ = true;
+  if (compositeCanvas_) {
+    compositeCanvas_->SetDirty();
+  }
+}
+
+void CharacterAnimation::UpdateCompositeCamera() {
+  if (!compositeCanvas_) {
+    return;
+  }
+
+  CompositeFrameInfo info = GetCurrentCompositeFrameInfo();
+  Camera& camera = compositeCanvas_->GetCanvasCamera();
+  camera.setViewport(std::max(info.width, 1), std::max(info.height, 1));
+  camera.setZoom(1.0f);
+  Vec2 cameraOrigin = GetWorldTransform().transformPoint(
+      Vec2(info.localBounds.left(), info.localBounds.top()));
+  camera.setPosition(cameraOrigin);
+}
+
+void CharacterAnimation::RefreshCompositeTextureIfNeeded() {
+  if (!compositeDirty_ || !compositeCanvas_) {
+    return;
+  }
+
+  CompositeFrameInfo info = GetCurrentCompositeFrameInfo();
+  if (!info.valid) {
+    compositeDirty_ = false;
+    lastCompositeSignature_ = CaptureCurrentRenderSignature();
+    return;
+  }
+
+  if (!compositeCanvas_->SetCanvasSize(std::max(info.width, 1),
+                                       std::max(info.height, 1))) {
+    return;
+  }
+
+  UpdateCompositeCamera();
+  if (!compositeCanvas_->Redraw()) {
+    return;
+  }
+
+  compositeDirty_ = false;
+  lastCompositeSignature_ = CaptureCurrentRenderSignature();
+  ++compositeVersion_;
+}
+
+void CharacterAnimation::RenderCurrentActionToCompositeCanvas() {
+  if (actionAnimations_.find(currentActionTag_) == actionAnimations_.end()) {
+    return;
+  }
+
+  RenderChildren();
+}
+
 } // namespace frostbite2D

Game/src/character/CharacterObject.cpp

@@ -404,6 +404,32 @@ animation::AniFrame CharacterObject::GetCurrentAnimationFrameInfo() const {
   return animationManager_ ? animationManager_->GetCurrentFrameInfo() : animation::AniFrame();
 }
 
+bool CharacterObject::HasCompositeTexture() const {
+  return animationManager_ && animationManager_->HasCompositeTexture();
+}
+
+Ptr<Texture> CharacterObject::GetCompositeTexture() const {
+  return animationManager_ ? animationManager_->GetCompositeTexture() : nullptr;
+}
+
+Vec2 CharacterObject::GetCompositeTextureSize() const {
+  return animationManager_ ? animationManager_->GetCompositeTextureSize() : Vec2::Zero();
+}
+
+Vec2 CharacterObject::GetCompositeOriginInTexture() const {
+  return animationManager_ ? animationManager_->GetCompositeOriginInTexture()
+                           : Vec2::Zero();
+}
+
+Vec2 CharacterObject::GetCompositeGroundAnchorInTexture() const {
+  return animationManager_ ? animationManager_->GetCompositeGroundAnchorInTexture()
+                           : Vec2::Zero();
+}
+
+uint64 CharacterObject::GetCompositeTextureVersion() const {
+  return animationManager_ ? animationManager_->GetCompositeVersion() : 0;
+}
+
 void CharacterObject::SetAnimationFrameFlagCallback(
     CharacterAnimation::ActionFrameFlagCallback callback) {
   if (animationManager_) {

Game/src/common/debug/GameDebugActor.cpp

@@ -1,9 +1,13 @@
-#include "common/debug/GameDebugActor.h"
+#include "common/debug/GameDebugActor.h"
 #include "character/CharacterObject.h"
 #include "map/GameMap.h"
 #include "ui/NineSliceActor.h"
 #include <SDL2/SDL.h>
+#include <algorithm>
+#include <cmath>
+#include <frostbite2D/2d/sprite.h>
 #include <frostbite2D/2d/text_sprite.h>
+#include <frostbite2D/graphics/renderer.h>
 #include <frostbite2D/scene/scene.h>
 #include <limits>
 
@@ -15,8 +19,38 @@ constexpr float kDebugHudMarginX = 12.0f;
 constexpr float kDebugHudMarginY = 12.0f;
 constexpr float kDebugHudPaddingX = 8.0f;
 constexpr float kDebugHudPaddingY = 6.0f;
+constexpr float kDebugHudLineGap = 4.0f;
+constexpr float kDebugHudPreviewGap = 8.0f;
+constexpr float kDebugHudOriginMarkerHalfExtent = 3.0f;
 constexpr char kDebugHudPopupImg[] = "sprite/interface/newstyle/windows/popup/popup.img";
 
+class DebugCrosshairActor : public Actor {
+public:
+  void Render() override {
+    if (!IsVisible()) {
+      return;
+    }
+
+    Renderer& renderer = Renderer::get();
+    Vec2 center = GetWorldTransform().transformPoint(Vec2::Zero());
+    Color color = Colors::Yellow;
+    color.a *= GetWorldOpacity();
+    if (color.a <= 0.0f) {
+      return;
+    }
+
+    float lineLength = kDebugHudOriginMarkerHalfExtent * 2.0f + 1.0f;
+    renderer.drawQuad(
+        Rect(center.x - kDebugHudOriginMarkerHalfExtent, center.y, lineLength,
+             1.0f),
+        color);
+    renderer.drawQuad(
+        Rect(center.x, center.y - kDebugHudOriginMarkerHalfExtent, 1.0f,
+             lineLength),
+        color);
+  }
+};
+
 void ConfigureTextLine(RefPtr<TextSprite> textSprite, const char* name,
                        int zOrder) {
   if (!textSprite) {
@@ -83,6 +117,11 @@ void GameDebugActor::SetDebugMap(GameMap* map) {
 }
 
 void GameDebugActor::SetTrackedCharacter(CharacterObject* character) {
+  if (trackedCharacter_ != character) {
+    previewCharacter_ = nullptr;
+    previewCompositeVersion_ = 0;
+    previewTextureAvailable_ = false;
+  }
   trackedCharacter_ = character;
   updateOverlay();
 }
@@ -93,6 +132,16 @@ void GameDebugActor::ClearDebugContext() {
   }
   debugMap_ = nullptr;
   trackedCharacter_ = nullptr;
+  previewCharacter_ = nullptr;
+  previewCompositeVersion_ = 0;
+  previewTextureAvailable_ = false;
+  if (compositePreview_) {
+    compositePreview_->SetTexture(nullptr);
+    compositePreview_->SetSize(0.0f, 0.0f);
+  }
+  if (compositeOriginMarker_) {
+    compositeOriginMarker_->SetVisible(false);
+  }
   setOverlayVisible(false);
 }
 
@@ -102,7 +151,7 @@ void GameDebugActor::OnUpdate(float deltaTime) {
 }
 
 void GameDebugActor::initOverlay() {
-  if (background_ || coordText_) {
+  if (background_ || coordText_ || actionText_ || compositeText_ || compositePreview_) {
     return;
   }
 
@@ -120,43 +169,233 @@ void GameDebugActor::initOverlay() {
   ConfigureTextLine(coordText_, "debugCoordText", 1);
   AddChild(coordText_);
 
+  actionText_ = TextSprite::create();
+  ConfigureTextLine(actionText_, "debugActionText", 1);
+  AddChild(actionText_);
+
+  compositeText_ = TextSprite::create();
+  ConfigureTextLine(compositeText_, "debugCompositeText", 1);
+  AddChild(compositeText_);
+
+  compositePreview_ = MakePtr<Sprite>();
+  compositePreview_->SetName("debugCompositePreview");
+  compositePreview_->SetZOrder(1);
+  AddChild(compositePreview_);
+
+  compositeOriginMarker_ = MakePtr<DebugCrosshairActor>();
+  compositeOriginMarker_->SetName("debugCompositeOriginMarker");
+  compositeOriginMarker_->SetZOrder(2);
+  compositeOriginMarker_->SetVisible(false);
+  AddChild(compositeOriginMarker_);
+
   setOverlayVisible(false);
 }
 
 void GameDebugActor::updateOverlay() {
-  if (!coordText_ || !debugMap_ || !trackedCharacter_ ||
-      !debugMap_->IsDebugModeEnabled()) {
-    if (debugMap_) {
-      debugMap_->SetDebugHighlightedMoveAreaIndex(GameMap::kInvalidMoveAreaIndex);
-    }
+  if (!coordText_ || !actionText_ || !compositeText_ || !compositePreview_) {
     setOverlayVisible(false);
     return;
   }
 
+  updateMapDebugHighlight();
+  if (!trackedCharacter_) {
+    if (compositePreview_) {
+      compositePreview_->SetTexture(nullptr);
+      compositePreview_->SetSize(0.0f, 0.0f);
+    }
+    if (compositeOriginMarker_) {
+      compositeOriginMarker_->SetVisible(false);
+    }
+    previewCharacter_ = nullptr;
+    previewCompositeVersion_ = 0;
+    previewTextureAvailable_ = false;
+    setOverlayVisible(false);
+    return;
+  }
+
+  const CharacterWorldPosition& worldPosition = trackedCharacter_->GetWorldPosition();
+
+  char coordTextBuffer[96];
+  SDL_snprintf(coordTextBuffer, sizeof(coordTextBuffer), "角色坐标: (%d, %d, %d)",
+               worldPosition.x, worldPosition.y, worldPosition.z);
+  coordText_->SetText(coordTextBuffer);
+
+  int frameCount = std::max(trackedCharacter_->GetCurrentAnimationFrameCount(), 1);
+  int frameIndex = std::clamp(trackedCharacter_->GetCurrentAnimationFrameIndex(), 0,
+                              frameCount - 1);
+  char actionTextBuffer[128];
+  SDL_snprintf(actionTextBuffer, sizeof(actionTextBuffer),
+               "Action: %s dir:%c frame:%d/%d",
+               trackedCharacter_->GetCurrentAction().empty()
+                   ? "<none>"
+                   : trackedCharacter_->GetCurrentAction().c_str(),
+               trackedCharacter_->GetDirection() >= 0 ? 'R' : 'L', frameIndex + 1,
+               frameCount);
+  actionText_->SetText(actionTextBuffer);
+
+  updateCompositePreview();
+
+  Vec2 coordTextSize = coordText_->GetTextSize();
+  Vec2 actionTextSize = actionText_->GetTextSize();
+  Vec2 compositeTextSize = compositeText_->GetTextSize();
+  Vec2 previewSize = compositePreview_->IsVisible() ? compositePreview_->GetSize()
+                                                    : Vec2::Zero();
+
+  float textBlockWidth = std::max(coordTextSize.x,
+                                  std::max(actionTextSize.x, compositeTextSize.x));
+  float panelWidth = std::max(textBlockWidth, previewSize.x) + kDebugHudPaddingX * 2.0f;
+
+  float contentHeight = coordTextSize.y;
+  if (actionText_->IsVisible()) {
+    contentHeight += kDebugHudLineGap + actionTextSize.y;
+  }
+  if (compositeText_->IsVisible()) {
+    contentHeight += kDebugHudLineGap + compositeTextSize.y;
+  }
+  if (compositePreview_->IsVisible()) {
+    contentHeight += kDebugHudPreviewGap + previewSize.y;
+  }
+
+  float panelHeight = contentHeight + kDebugHudPaddingY * 2.0f;
+  Vec2 panelSize(panelWidth, panelHeight);
+  if (background_) {
+    background_->SetSize(panelSize);
+  }
+
+  SetPosition(kDebugHudMarginX, kDebugHudMarginY);
+  SetScale(1.0f);
+
+  float currentY = kDebugHudPaddingY;
+  coordText_->SetPosition(kDebugHudPaddingX, currentY);
+  currentY += coordTextSize.y;
+
+  if (actionText_->IsVisible()) {
+    currentY += kDebugHudLineGap;
+    actionText_->SetPosition(kDebugHudPaddingX, currentY);
+    currentY += actionTextSize.y;
+  }
+
+  if (compositeText_->IsVisible()) {
+    currentY += kDebugHudLineGap;
+    compositeText_->SetPosition(kDebugHudPaddingX, currentY);
+    currentY += compositeTextSize.y;
+  }
+
+  if (compositePreview_->IsVisible()) {
+    currentY += kDebugHudPreviewGap;
+    compositePreview_->SetPosition(kDebugHudPaddingX, currentY);
+    updateCompositePreviewMarker(trackedCharacter_->GetCompositeTextureSize(),
+                                 compositePreview_->GetSize(),
+                                 trackedCharacter_->GetCompositeOriginInTexture());
+  }
+
+  setOverlayVisible(true);
+}
+
+void GameDebugActor::updateMapDebugHighlight() {
+  if (!debugMap_) {
+    return;
+  }
+
+  if (!trackedCharacter_ || !debugMap_->IsDebugModeEnabled()) {
+    debugMap_->SetDebugHighlightedMoveAreaIndex(GameMap::kInvalidMoveAreaIndex);
+    return;
+  }
+
   const CharacterWorldPosition& worldPosition = trackedCharacter_->GetWorldPosition();
   Vec3 currentWorldPos(static_cast<float>(worldPosition.x),
                        static_cast<float>(worldPosition.y),
                        static_cast<float>(worldPosition.z));
   size_t moveAreaIndex = debugMap_->FindMoveAreaIndex(currentWorldPos);
   debugMap_->SetDebugHighlightedMoveAreaIndex(moveAreaIndex);
+}
 
-  char coordTextBuffer[96];
-  SDL_snprintf(coordTextBuffer, sizeof(coordTextBuffer), "角色坐标: (%d, %d, %d)",
-               worldPosition.x, worldPosition.y, worldPosition.z);
-  coordText_->SetText(coordTextBuffer);
-
-  Vec2 coordTextSize = coordText_->GetTextSize();
-  float panelWidth = coordTextSize.x + kDebugHudPaddingX * 2.0f;
-  float panelHeight = coordTextSize.y + kDebugHudPaddingY * 2.0f;
-  Vec2 panelSize(panelWidth, panelHeight);
-  if (background_) {
-    background_->SetSize(panelSize);
+void GameDebugActor::updateCompositePreview() {
+  if (!trackedCharacter_ || !compositePreview_ || !compositeText_) {
+    return;
   }
 
-  SetPosition(kDebugHudMarginX, kDebugHudMarginY);
-  SetScale(1.0f);
-  coordText_->SetPosition(kDebugHudPaddingX, kDebugHudPaddingY);
-  setOverlayVisible(true);
+  Ptr<Texture> compositeTexture = trackedCharacter_->GetCompositeTexture();
+  bool textureAvailable =
+      trackedCharacter_->HasCompositeTexture() && compositeTexture != nullptr;
+  uint64 compositeVersion =
+      textureAvailable ? trackedCharacter_->GetCompositeTextureVersion() : 0;
+  bool needsRefresh = previewCharacter_ != trackedCharacter_ ||
+                      previewCompositeVersion_ != compositeVersion ||
+                      previewTextureAvailable_ != textureAvailable;
+
+  if (needsRefresh) {
+    previewCharacter_ = trackedCharacter_;
+    previewCompositeVersion_ = compositeVersion;
+    previewTextureAvailable_ = textureAvailable;
+
+    if (textureAvailable) {
+      compositePreview_->SetTexture(compositeTexture);
+    } else {
+      compositePreview_->SetTexture(nullptr);
+      compositePreview_->SetSize(0.0f, 0.0f);
+      compositePreview_->SetVisible(false);
+      if (compositeOriginMarker_) {
+        compositeOriginMarker_->SetVisible(false);
+      }
+    }
+  }
+
+  if (!textureAvailable) {
+    compositeText_->SetText("Composite: unavailable");
+    compositeText_->SetVisible(true);
+    return;
+  }
+
+  Vec2 textureSize = trackedCharacter_->GetCompositeTextureSize();
+  Vec2 previewSize = computeScreenMatchedPreviewSize(textureSize);
+  Vec2 origin = trackedCharacter_->GetCompositeOriginInTexture();
+  Vec2 groundAnchor = trackedCharacter_->GetCompositeGroundAnchorInTexture();
+  compositePreview_->SetSize(previewSize);
+  compositePreview_->SetVisible(true);
+  updateCompositePreviewMarker(textureSize, previewSize, origin);
+
+  char compositeTextBuffer[256];
+  SDL_snprintf(
+      compositeTextBuffer, sizeof(compositeTextBuffer),
+      "Composite: tex %.0fx%.0f preview %.0fx%.0f origin(%.0f, %.0f) ground(%.0f, %.0f) ver %llu",
+      textureSize.x, textureSize.y, previewSize.x, previewSize.y, origin.x,
+      origin.y, groundAnchor.x, groundAnchor.y,
+      static_cast<unsigned long long>(trackedCharacter_->GetCompositeTextureVersion()));
+  compositeText_->SetText(compositeTextBuffer);
+  compositeText_->SetVisible(true);
+}
+
+Vec2 GameDebugActor::computeScreenMatchedPreviewSize(const Vec2& textureSize) const {
+  if (!trackedCharacter_ || textureSize.x <= 0.0f || textureSize.y <= 0.0f) {
+    return Vec2::Zero();
+  }
+
+  Renderer& renderer = Renderer::get();
+  Camera* worldCamera = renderer.getCamera();
+  float zoom = worldCamera ? worldCamera->getZoom() : 1.0f;
+  Vec2 worldScale = math::extractScale(trackedCharacter_->GetWorldTransform().matrix);
+  return Vec2(std::max(textureSize.x * std::abs(worldScale.x) * zoom, 1.0f),
+              std::max(textureSize.y * std::abs(worldScale.y) * zoom, 1.0f));
+}
+
+void GameDebugActor::updateCompositePreviewMarker(const Vec2& textureSize,
+                                                  const Vec2& previewSize,
+                                                  const Vec2& originInTexture) {
+  if (!compositeOriginMarker_ || !compositePreview_ || textureSize.x <= 0.0f ||
+      textureSize.y <= 0.0f || previewSize.x <= 0.0f || previewSize.y <= 0.0f) {
+    if (compositeOriginMarker_) {
+      compositeOriginMarker_->SetVisible(false);
+    }
+    return;
+  }
+
+  float scaleX = previewSize.x / textureSize.x;
+  float scaleY = previewSize.y / textureSize.y;
+  Vec2 previewTopLeft = compositePreview_->GetPosition();
+  compositeOriginMarker_->SetPosition(previewTopLeft.x + originInTexture.x * scaleX,
+                                      previewTopLeft.y + originInTexture.y * scaleY);
+  compositeOriginMarker_->SetVisible(compositePreview_->IsVisible());
 }
 
 void GameDebugActor::setOverlayVisible(bool visible) {
@@ -166,6 +405,20 @@ void GameDebugActor::setOverlayVisible(bool visible) {
   if (coordText_) {
     coordText_->SetVisible(visible);
   }
+  if (actionText_) {
+    actionText_->SetVisible(visible);
+  }
+  if (compositeText_) {
+    compositeText_->SetVisible(visible);
+  }
+  if (compositePreview_) {
+    compositePreview_->SetVisible(visible && previewTextureAvailable_);
+  }
+  if (compositeOriginMarker_) {
+    compositeOriginMarker_->SetVisible(visible && previewTextureAvailable_ &&
+                                       compositePreview_ &&
+                                       compositePreview_->IsVisible());
+  }
 }
 
 } // namespace frostbite2D