122 lines
2.7 KiB
Go
122 lines
2.7 KiB
Go
package skin_renderer
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import (
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"bytes"
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"image"
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"image/png"
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)
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// CapeRenderer 披风渲染器
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type CapeRenderer struct{}
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// NewCapeRenderer 创建披风渲染器
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func NewCapeRenderer() *CapeRenderer {
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return &CapeRenderer{}
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}
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// Render 渲染披风
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// 披风纹理布局：
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// - 正面: (1, 1) 到 (11, 17) - 10x16 像素
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// - 背面: (12, 1) 到 (22, 17) - 10x16 像素
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func (r *CapeRenderer) Render(capeData []byte, height int) (image.Image, error) {
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// 解码披风图像
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img, err := png.Decode(bytes.NewReader(capeData))
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if err != nil {
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return nil, err
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}
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bounds := img.Bounds()
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srcWidth := bounds.Dx()
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srcHeight := bounds.Dy()
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// 披风纹理可能是 64x32 或 22x17
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// 标准披风正面区域
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var frontX, frontY, frontW, frontH int
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if srcWidth >= 64 && srcHeight >= 32 {
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// 64x32 格式（Minecraft 1.8+）
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// 正面: (1, 1) 到 (11, 17)
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frontX = 1
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frontY = 1
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frontW = 10
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frontH = 16
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} else if srcWidth >= 22 && srcHeight >= 17 {
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// 22x17 格式（旧版）
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frontX = 1
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frontY = 1
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frontW = 10
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frontH = 16
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} else {
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// 未知格式，直接缩放整个图像
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return resizeImageBilinear(img, height*srcWidth/srcHeight, height), nil
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}
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// 提取正面区域
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front := image.NewRGBA(image.Rect(0, 0, frontW, frontH))
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for y := 0; y < frontH; y++ {
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for x := 0; x < frontW; x++ {
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front.Set(x, y, img.At(bounds.Min.X+frontX+x, bounds.Min.Y+frontY+y))
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}
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}
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// 计算输出尺寸，保持宽高比
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outputWidth := height * frontW / frontH
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if outputWidth < 1 {
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outputWidth = 1
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}
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// 使用最近邻缩放保持像素风格
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return scaleNearest(front, outputWidth, height), nil
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}
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// scaleNearest 最近邻缩放
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func scaleNearest(src image.Image, width, height int) *image.RGBA {
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bounds := src.Bounds()
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srcW := bounds.Dx()
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srcH := bounds.Dy()
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dst := image.NewRGBA(image.Rect(0, 0, width, height))
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for y := 0; y < height; y++ {
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for x := 0; x < width; x++ {
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srcX := bounds.Min.X + x*srcW/width
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srcY := bounds.Min.Y + y*srcH/height
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dst.Set(x, y, src.At(srcX, srcY))
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}
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}
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return dst
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}
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// resizeImageBilinear 双线性插值缩放
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func resizeImageBilinear(src image.Image, width, height int) *image.RGBA {
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bounds := src.Bounds()
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srcW := float64(bounds.Dx())
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srcH := float64(bounds.Dy())
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dst := image.NewRGBA(image.Rect(0, 0, width, height))
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for y := 0; y < height; y++ {
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for x := 0; x < width; x++ {
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// 计算源图像中的位置
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srcX := float64(x) * srcW / float64(width)
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srcY := float64(y) * srcH / float64(height)
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// 简单的最近邻（可以改进为双线性）
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ix := int(srcX)
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iy := int(srcY)
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if ix >= bounds.Dx() {
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ix = bounds.Dx() - 1
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}
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if iy >= bounds.Dy() {
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iy = bounds.Dy() - 1
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}
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dst.Set(x, y, src.At(bounds.Min.X+ix, bounds.Min.Y+iy))
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}
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}
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return dst
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}
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