| /* |
| * 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; |
| |
| import com.android.ide.common.rendering.api.LayoutLog; |
| import com.android.layoutlib.bridge.Bridge; |
| import com.android.tools.layoutlib.annotations.VisibleForTesting; |
| |
| import android.graphics.Bitmap; |
| import android.view.math.Math3DHelper; |
| |
| /** |
| * Generate spot shadow bitmap. |
| */ |
| class SpotShadowTriangulator { |
| |
| private final SpotShadowConfig mShadowConfig; |
| private float[][] mStrips; |
| |
| public SpotShadowTriangulator(SpotShadowConfig config) { |
| mShadowConfig = config; |
| } |
| |
| /** |
| * Populate the shadow bitmap. |
| */ |
| public void triangulate() { |
| try { |
| float[] lightSources = |
| SpotShadowVertexCalculator.calculateLight(mShadowConfig.getLightRadius(), |
| mShadowConfig.getLightCoord()[0], |
| mShadowConfig.getLightCoord()[1], mShadowConfig.getLightCoord()[2]); |
| |
| |
| mStrips = new float[2][]; |
| int[] sizes = SpotShadowVertexCalculator.getStripSizes(mShadowConfig.getPolyLength()); |
| for (int i = 0; i < sizes.length; ++i) { |
| mStrips[i] = new float[3 * sizes[i]]; |
| } |
| |
| SpotShadowVertexCalculator.calculateShadow(lightSources, |
| mShadowConfig.getPoly(), |
| mShadowConfig.getPolyLength(), |
| mShadowConfig.getShadowStrength(), |
| mStrips); |
| } catch (IndexOutOfBoundsException|ArithmeticException mathError) { |
| Bridge.getLog().warning(LayoutLog.TAG_INFO, "Arithmetic error while drawing " + |
| "spot shadow", |
| null, mathError); |
| } catch (Exception ex) { |
| Bridge.getLog().warning(LayoutLog.TAG_INFO, "Error while drawing shadow", |
| null, ex); |
| } |
| } |
| /** |
| * @return true if generated shadow poly is valid. False otherwise. |
| */ |
| public boolean validate() { |
| return mStrips != null && mStrips[0].length >= 9; |
| } |
| |
| public float[][] getStrips() { |
| return mStrips; |
| } |
| } |