既然图片遮罩有问题，那就shader吧

既然图片搞了好多次都不好，那就自己用shader加遮罩吧。

image.png

vert

···
attribute vec4 a_position;
attribute vec4 a_color;
attribute vec2 a_texCoord0;
varying vec4 v_color;
uniform mat4 u_projTrans;
varying vec2 v_textCoords;

void main() {
v_color = a_color;
v_color.a = v_color.a * (255.0/254.0);
v_textCoords = a_texCoord0;
gl_Position = u_projTrans * a_position;
}
···

frag

#ifdef GL_ES
precision mediump float;
#endif


//input from vertex shader
varying vec4 v_color;
varying vec2 v_textCoords;
uniform sampler2D u_texture;


void main() {
//    vec4 tempColor = v_color* texture2D(u_texture,v_textCoords);
//       if(tempColor.a>0.1){
//           gl_FragColor = vec4(0.3, 0.3, 0.3, tempColor.a);
//       }else{
//           gl_FragColor = vec4(1, 1, 1, tempColor.a);
 //      }
    vec4 tempColor = v_color* texture2D(u_texture,v_textCoords);
    vec3 xx =  mix(tempColor.rgb,vec3(0,0,0),0.66) ;

  //  vec3 xx =  tempColor.rgb*vec3(0.4,0.4,0.4) ;
  //  gl_FragColor = vec4(xx,tempColor.rgba);

  gl_FragColor = vec4(xx,tempColor.a);

}

java

public class ShadowGroup extends Group {
    ShaderProgram program;
    public ShadowGroup(){
        program = new ShaderProgram(Gdx.files.internal("shader/hui.vert"),Gdx.files.internal("shader/hui.frag"));
        Image image = new Image(new Texture("img/poker1_face.png"));
        addActor(image);
    }

    @Override
    public void draw(Batch batch, float parentAlpha) {
        batch.flush();
        batch.setShader(program);
        super.draw(batch, parentAlpha);
        batch.flush();
        batch.setShader(null);
    }
}