1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.launcher3; 18 19 import android.content.Context; 20 import android.content.res.Resources; 21 import android.graphics.Bitmap; 22 import android.graphics.BlurMaskFilter; 23 import android.graphics.Canvas; 24 import android.graphics.Color; 25 import android.graphics.Paint; 26 import android.graphics.PorterDuff; 27 import android.graphics.PorterDuffXfermode; 28 import android.graphics.Rect; 29 import android.graphics.drawable.Drawable; 30 import android.util.SparseArray; 31 32 /** 33 * Utility class to generate shadow and outline effect, which are used for click feedback 34 * and drag-n-drop respectively. 35 */ 36 public class HolographicOutlineHelper { 37 38 private static HolographicOutlineHelper sInstance; 39 40 private final Canvas mCanvas = new Canvas(); 41 private final Paint mDrawPaint = new Paint(); 42 private final Paint mBlurPaint = new Paint(); 43 private final Paint mErasePaint = new Paint(); 44 45 private final BlurMaskFilter mMediumOuterBlurMaskFilter; 46 private final BlurMaskFilter mThinOuterBlurMaskFilter; 47 private final BlurMaskFilter mMediumInnerBlurMaskFilter; 48 49 private final BlurMaskFilter mShadowBlurMaskFilter; 50 51 // We have 4 different icon sizes: homescreen, hotseat, folder & all-apps 52 private final SparseArray<Bitmap> mBitmapCache = new SparseArray<>(4); 53 54 private HolographicOutlineHelper(Context context) { 55 Resources res = context.getResources(); 56 57 float mediumBlur = res.getDimension(R.dimen.blur_size_medium_outline); 58 mMediumOuterBlurMaskFilter = new BlurMaskFilter(mediumBlur, BlurMaskFilter.Blur.OUTER); 59 mMediumInnerBlurMaskFilter = new BlurMaskFilter(mediumBlur, BlurMaskFilter.Blur.NORMAL); 60 61 mThinOuterBlurMaskFilter = new BlurMaskFilter( 62 res.getDimension(R.dimen.blur_size_thin_outline), BlurMaskFilter.Blur.OUTER); 63 64 mShadowBlurMaskFilter = new BlurMaskFilter( 65 res.getDimension(R.dimen.blur_size_click_shadow), BlurMaskFilter.Blur.NORMAL); 66 67 mDrawPaint.setFilterBitmap(true); 68 mDrawPaint.setAntiAlias(true); 69 mBlurPaint.setFilterBitmap(true); 70 mBlurPaint.setAntiAlias(true); 71 mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 72 mErasePaint.setFilterBitmap(true); 73 mErasePaint.setAntiAlias(true); 74 } 75 76 public static HolographicOutlineHelper obtain(Context context) { 77 if (sInstance == null) { 78 sInstance = new HolographicOutlineHelper(context); 79 } 80 return sInstance; 81 } 82 83 /** 84 * Applies a more expensive and accurate outline to whatever is currently drawn in a specified 85 * bitmap. 86 */ 87 void applyExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color, 88 int outlineColor) { 89 applyExpensiveOutlineWithBlur(srcDst, srcDstCanvas, color, outlineColor, true); 90 } 91 void applyExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color, 92 int outlineColor, boolean clipAlpha) { 93 94 // We start by removing most of the alpha channel so as to ignore shadows, and 95 // other types of partial transparency when defining the shape of the object 96 if (clipAlpha) { 97 int[] srcBuffer = new int[srcDst.getWidth() * srcDst.getHeight()]; 98 srcDst.getPixels(srcBuffer, 99 0, srcDst.getWidth(), 0, 0, srcDst.getWidth(), srcDst.getHeight()); 100 for (int i = 0; i < srcBuffer.length; i++) { 101 final int alpha = srcBuffer[i] >>> 24; 102 if (alpha < 188) { 103 srcBuffer[i] = 0; 104 } 105 } 106 srcDst.setPixels(srcBuffer, 107 0, srcDst.getWidth(), 0, 0, srcDst.getWidth(), srcDst.getHeight()); 108 } 109 Bitmap glowShape = srcDst.extractAlpha(); 110 111 // calculate the outer blur first 112 mBlurPaint.setMaskFilter(mMediumOuterBlurMaskFilter); 113 int[] outerBlurOffset = new int[2]; 114 Bitmap thickOuterBlur = glowShape.extractAlpha(mBlurPaint, outerBlurOffset); 115 116 mBlurPaint.setMaskFilter(mThinOuterBlurMaskFilter); 117 int[] brightOutlineOffset = new int[2]; 118 Bitmap brightOutline = glowShape.extractAlpha(mBlurPaint, brightOutlineOffset); 119 120 // calculate the inner blur 121 srcDstCanvas.setBitmap(glowShape); 122 srcDstCanvas.drawColor(0xFF000000, PorterDuff.Mode.SRC_OUT); 123 mBlurPaint.setMaskFilter(mMediumInnerBlurMaskFilter); 124 int[] thickInnerBlurOffset = new int[2]; 125 Bitmap thickInnerBlur = glowShape.extractAlpha(mBlurPaint, thickInnerBlurOffset); 126 127 // mask out the inner blur 128 srcDstCanvas.setBitmap(thickInnerBlur); 129 srcDstCanvas.drawBitmap(glowShape, -thickInnerBlurOffset[0], 130 -thickInnerBlurOffset[1], mErasePaint); 131 srcDstCanvas.drawRect(0, 0, -thickInnerBlurOffset[0], thickInnerBlur.getHeight(), 132 mErasePaint); 133 srcDstCanvas.drawRect(0, 0, thickInnerBlur.getWidth(), -thickInnerBlurOffset[1], 134 mErasePaint); 135 136 // draw the inner and outer blur 137 srcDstCanvas.setBitmap(srcDst); 138 srcDstCanvas.drawColor(0, PorterDuff.Mode.CLEAR); 139 mDrawPaint.setColor(color); 140 srcDstCanvas.drawBitmap(thickInnerBlur, thickInnerBlurOffset[0], thickInnerBlurOffset[1], 141 mDrawPaint); 142 srcDstCanvas.drawBitmap(thickOuterBlur, outerBlurOffset[0], outerBlurOffset[1], 143 mDrawPaint); 144 145 // draw the bright outline 146 mDrawPaint.setColor(outlineColor); 147 srcDstCanvas.drawBitmap(brightOutline, brightOutlineOffset[0], brightOutlineOffset[1], 148 mDrawPaint); 149 150 // cleanup 151 srcDstCanvas.setBitmap(null); 152 brightOutline.recycle(); 153 thickOuterBlur.recycle(); 154 thickInnerBlur.recycle(); 155 glowShape.recycle(); 156 } 157 158 Bitmap createMediumDropShadow(BubbleTextView view) { 159 Drawable icon = view.getIcon(); 160 if (icon == null) { 161 return null; 162 } 163 Rect rect = icon.getBounds(); 164 165 int bitmapWidth = (int) (rect.width() * view.getScaleX()); 166 int bitmapHeight = (int) (rect.height() * view.getScaleY()); 167 if (bitmapHeight <= 0 || bitmapWidth <= 0) { 168 return null; 169 } 170 171 int key = (bitmapWidth << 16) | bitmapHeight; 172 Bitmap cache = mBitmapCache.get(key); 173 if (cache == null) { 174 cache = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ARGB_8888); 175 mCanvas.setBitmap(cache); 176 mBitmapCache.put(key, cache); 177 } else { 178 mCanvas.setBitmap(cache); 179 mCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR); 180 } 181 182 mCanvas.save(Canvas.MATRIX_SAVE_FLAG); 183 mCanvas.scale(view.getScaleX(), view.getScaleY()); 184 mCanvas.translate(-rect.left, -rect.top); 185 icon.draw(mCanvas); 186 mCanvas.restore(); 187 mCanvas.setBitmap(null); 188 189 mBlurPaint.setMaskFilter(mShadowBlurMaskFilter); 190 return cache.extractAlpha(mBlurPaint, null); 191 } 192 } 193
