Add initial code

src/util/renders/leftbody.go

@@ -0,0 +1,44 @@
+package renders
+
+import (
+	"image"
+)
+
+func RenderLeftBody(skin *image.NRGBA, opts RenderOptions) *image.NRGBA {
+	slimOffset := GetSlimOffset(opts.Slim)
+
+	var (
+		leftHead    *image.NRGBA = RemoveTransparency(Extract(skin, 24, 8, 8, 8))
+		leftLeftArm *image.NRGBA = nil
+		leftLeftLeg *image.NRGBA = nil
+	)
+
+	if IsOldSkin(skin) {
+		leftLeftArm = FlipHorizontal(RemoveTransparency(Extract(skin, 40, 20, 4, 12)))
+		leftLeftLeg = FlipHorizontal(RemoveTransparency(Extract(skin, 0, 20, 4, 12)))
+	} else {
+		leftLeftArm = RemoveTransparency(Extract(skin, 40-slimOffset, 52, 4, 12))
+		leftLeftLeg = RemoveTransparency(Extract(skin, 24, 52, 4, 12))
+
+		if opts.Overlay {
+			overlaySkin := FixTransparency(skin)
+
+			leftHead = Composite(leftHead, Extract(overlaySkin, 48, 8, 8, 8), 0, 0)
+			leftLeftArm = Composite(leftLeftArm, Extract(overlaySkin, 56-slimOffset, 52, 4, 12), 0, 0)
+			leftLeftLeg = Composite(leftLeftLeg, Extract(overlaySkin, 8, 52, 4, 12), 0, 0)
+		}
+	}
+
+	output := image.NewNRGBA(image.Rect(0, 0, 8, 32))
+
+	// Left Head
+	output = Composite(output, leftHead, 0, 0)
+
+	// Left Arm
+	output = Composite(output, leftLeftArm, 2, 8)
+
+	// Left Leg
+	output = Composite(output, leftLeftLeg, 2, 20)
+
+	return Scale(output, opts.Scale)
+}