gecko/mobile/android/base/gfx/Layer.java

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package org.mozilla.gecko.gfx;

import android.graphics.PointF;
import javax.microedition.khronos.opengles.GL10;

public abstract class Layer {
    public PointF origin;

    public Layer() {
        origin = new PointF(0.0f, 0.0f);
    }

    /** Draws the layer. Automatically applies the translation. */
    public final void draw(GL10 gl) {
        gl.glPushMatrix();
        gl.glTranslatef(origin.x, origin.y, 0.0f);
        onDraw(gl);
        gl.glPopMatrix();
    }

    /**
     * Subclasses implement this method to perform drawing.
     *
     * Invariant: The current matrix mode must be GL_MODELVIEW both before and after this call.
     */
    protected abstract void onDraw(GL10 gl);
}