SkNoncopyable

      ∟SkRefCnt

  　　　　 ∟SkFlattenable

   　　　　   　　∟SkShader

∟Gradient_Shader            ---->通过SkGradientShader创建

∟SkFilterShader

∟SkColorShader

∟SkComposeShader

∟SkBitmapProcShader

∟Sk3DShader

∟SkTriColorShade

/** \class SkShader
 *
 *  SkShader is the based class for objects that return horizontal spans of
 *  colors during drawing. A subclass of SkShader is installed in a SkPaint
 *  calling paint.setShader(shader). After that any object (other than a bitmap)
 *  that is drawn with that paint will get its color(s) from the shader.
 */

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