android/view/shadow/ShadowConstants.java

/*
 * Copyright (C) 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.view.shadow;

/**
 * Constant values for shadow related configuration
 */
class ShadowConstants {

    /**
     * This is used as a factor by which to scale down the shadow bitmap. If we have world
     * Width x Height, shadow bitmap will be Width/SCALE_DOWN x Height/SCALE_DOWN and during
     * canvas draw the shadow will be scaled up, resulting faster perf (due to smaller bitmap) but
     * blurrier (lower quality) shadow.
     */
    public static final int SCALE_DOWN = 5;

    public static final float MIN_ALPHA = 0.2f;

    public static final int SPOT_SHADOW_LIGHT_Z_HEIGHT_DP = 50 / SCALE_DOWN;
    public static final int SPOT_SHADOW_LIGHT_Z_EPSILON = 10 / SCALE_DOWN;
    public static final float SPOT_SHADOW_STRENGTH = 0.3f;

    public static final float AMBIENT_SHADOW_EDGE_SCALE = 60f;
    public static final float AMBIENT_SHADOW_SHADOW_BOUND = 0.02f * SCALE_DOWN;
    public static final float AMBIENT_SHADOW_STRENGTH = 1.0f;

    public static final int COORDINATE_SIZE = 3;
    public static final int RECT_VERTICES_SIZE = 4;

    public static final int SPLICE_ROUNDED_EDGE = 5;
}