暂存服务端渲染功能，材质渲染计划迁移至前端

internal/service/skin_renderer/minecraft.go

@@ -0,0 +1,113 @@
+package skin_renderer
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+)
+
+// Minecraft 提供 Minecraft 皮肤渲染的入口方法
+// 与 blessing/texture-renderer 的 Minecraft 类保持兼容
+type Minecraft struct{}
+
+// NewMinecraft 创建 Minecraft 渲染器实例
+func NewMinecraft() *Minecraft {
+	return &Minecraft{}
+}
+
+// RenderSkin 渲染完整皮肤预览（正面+背面）
+// ratio: 缩放比例，默认 7.0
+// isAlex: 是否为 Alex 模型（细手臂）
+func (m *Minecraft) RenderSkin(skinData []byte, ratio float64, isAlex bool) (image.Image, error) {
+	vp := 15 // vertical padding
+	hp := 30 // horizontal padding
+	ip := 15 // internal padding
+
+	// 渲染正面（-45度）
+	frontRenderer := NewSkinRenderer(ratio, false, -45, -25)
+	front, err := frontRenderer.Render(skinData, isAlex)
+	if err != nil {
+		return nil, err
+	}
+
+	// 渲染背面（135度）
+	backRenderer := NewSkinRenderer(ratio, false, 135, -25)
+	back, err := backRenderer.Render(skinData, isAlex)
+	if err != nil {
+		return nil, err
+	}
+
+	width := front.Bounds().Dx()
+	height := front.Bounds().Dy()
+
+	// 创建画布
+	canvas := createEmptyCanvas((hp+width+ip)*2, vp*2+height)
+
+	// 绘制背面（左侧）
+	draw.Draw(canvas, image.Rect(hp, vp, hp+width, vp+height), back, back.Bounds().Min, draw.Over)
+
+	// 绘制正面（右侧）
+	draw.Draw(canvas, image.Rect(hp+width+ip*2, vp, hp+width*2+ip*2, vp+height), front, front.Bounds().Min, draw.Over)
+
+	return canvas, nil
+}
+
+// RenderCape 渲染披风
+// height: 输出高度
+func (m *Minecraft) RenderCape(capeData []byte, height int) (image.Image, error) {
+	vp := 20 // vertical padding
+	hp := 40 // horizontal padding
+
+	renderer := NewCapeRenderer()
+	cape, err := renderer.Render(capeData, height)
+	if err != nil {
+		return nil, err
+	}
+
+	width := cape.Bounds().Dx()
+	capeHeight := cape.Bounds().Dy()
+
+	canvas := createEmptyCanvas(hp*2+width, vp*2+capeHeight)
+	draw.Draw(canvas, image.Rect(hp, vp, hp+width, vp+capeHeight), cape, cape.Bounds().Min, draw.Over)
+
+	return canvas, nil
+}
+
+// Render2DAvatar 渲染 2D 头像
+// ratio: 缩放比例，默认 15.0
+func (m *Minecraft) Render2DAvatar(skinData []byte, ratio float64) (image.Image, error) {
+	renderer := NewSkinRendererFull(ratio, true, 0, 0, 0, 0, 0, 0, 0, true)
+	return renderer.Render(skinData, false)
+}
+
+// Render3DAvatar 渲染 3D 头像
+// ratio: 缩放比例，默认 15.0
+func (m *Minecraft) Render3DAvatar(skinData []byte, ratio float64) (image.Image, error) {
+	renderer := NewSkinRenderer(ratio, true, 45, -25)
+	return renderer.Render(skinData, false)
+}
+
+// RenderSkinWithAngle 渲染指定角度的皮肤
+func (m *Minecraft) RenderSkinWithAngle(skinData []byte, ratio float64, isAlex bool, hRotation, vRotation float64) (image.Image, error) {
+	renderer := NewSkinRenderer(ratio, false, hRotation, vRotation)
+	return renderer.Render(skinData, isAlex)
+}
+
+// RenderHeadWithAngle 渲染指定角度的头像
+func (m *Minecraft) RenderHeadWithAngle(skinData []byte, ratio float64, hRotation, vRotation float64) (image.Image, error) {
+	renderer := NewSkinRenderer(ratio, true, hRotation, vRotation)
+	return renderer.Render(skinData, false)
+}
+
+// createEmptyCanvas 创建透明画布
+func createEmptyCanvas(width, height int) *image.RGBA {
+	img := image.NewRGBA(image.Rect(0, 0, width, height))
+	// 填充透明背景
+	transparent := color.RGBA{0, 0, 0, 0}
+	for y := 0; y < height; y++ {
+		for x := 0; x < width; x++ {
+			img.SetRGBA(x, y, transparent)
+		}
+	}
+	return img
+}