1 /* 2 * Copyright (C) 2015 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.setupwizardlib; 18 19 import android.annotation.SuppressLint; 20 import android.content.Context; 21 import android.content.res.TypedArray; 22 import android.graphics.Bitmap; 23 import android.graphics.Canvas; 24 import android.graphics.Color; 25 import android.graphics.ColorFilter; 26 import android.graphics.Paint; 27 import android.graphics.Path; 28 import android.graphics.PixelFormat; 29 import android.graphics.PorterDuff; 30 import android.graphics.PorterDuffXfermode; 31 import android.graphics.Rect; 32 import android.graphics.drawable.Drawable; 33 import android.os.Build; 34 import android.support.annotation.NonNull; 35 import android.support.annotation.VisibleForTesting; 36 37 import java.lang.ref.SoftReference; 38 39 /** 40 * This class draws the GLIF pattern used as the status bar background for phones and background for 41 * tablets in GLIF layout. 42 */ 43 public class GlifPatternDrawable extends Drawable { 44 /* 45 * This class essentially implements a simple SVG in Java code, with some special handling of 46 * scaling when given different bounds. 47 */ 48 49 /* static section */ 50 51 @SuppressLint("InlinedApi") 52 private static final int[] ATTRS_PRIMARY_COLOR = new int[]{ android.R.attr.colorPrimary }; 53 54 private static final float VIEWBOX_HEIGHT = 768f; 55 private static final float VIEWBOX_WIDTH = 1366f; 56 // X coordinate of scale focus, as a fraction of of the width. (Range is 0 - 1) 57 private static final float SCALE_FOCUS_X = .146f; 58 // Y coordinate of scale focus, as a fraction of of the height. (Range is 0 - 1) 59 private static final float SCALE_FOCUS_Y = .228f; 60 61 // Alpha component of the color to be drawn, on top of the grayscale pattern. (Range is 0 - 1) 62 private static final float COLOR_ALPHA = .8f; 63 // Int version of COLOR_ALPHA. (Range is 0 - 255) 64 private static final int COLOR_ALPHA_INT = (int) (COLOR_ALPHA * 255); 65 66 // Cap the bitmap size, such that it won't hurt the performance too much 67 // and it won't crash due to a very large scale. 68 // The drawable will look blurry above this size. 69 // This is a multiplier applied on top of the viewbox size. 70 // Resulting max cache size = (1.5 x 1366, 1.5 x 768) = (2049, 1152) 71 private static final float MAX_CACHED_BITMAP_SCALE = 1.5f; 72 73 private static final int NUM_PATHS = 7; 74 75 private static SoftReference<Bitmap> sBitmapCache; 76 private static Path[] sPatternPaths; 77 private static int[] sPatternLightness; 78 79 public static GlifPatternDrawable getDefault(Context context) { 80 int colorPrimary = 0; 81 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 82 final TypedArray a = context.obtainStyledAttributes(ATTRS_PRIMARY_COLOR); 83 colorPrimary = a.getColor(0, Color.BLACK); 84 a.recycle(); 85 } 86 return new GlifPatternDrawable(colorPrimary); 87 } 88 89 @VisibleForTesting 90 public static void invalidatePattern() { 91 sBitmapCache = null; 92 } 93 94 /* non-static section */ 95 96 private int mColor; 97 private Paint mTempPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 98 99 public GlifPatternDrawable(int color) { 100 setColor(color); 101 } 102 103 @Override 104 public void draw(@NonNull Canvas canvas) { 105 final Rect bounds = getBounds(); 106 int drawableWidth = bounds.width(); 107 int drawableHeight = bounds.height(); 108 Bitmap bitmap = null; 109 if (sBitmapCache != null) { 110 bitmap = sBitmapCache.get(); 111 } 112 if (bitmap != null) { 113 final int bitmapWidth = bitmap.getWidth(); 114 final int bitmapHeight = bitmap.getHeight(); 115 // Invalidate the cache if this drawable is bigger and we can still create a bigger 116 // cache. 117 if (drawableWidth > bitmapWidth 118 && bitmapWidth < VIEWBOX_WIDTH * MAX_CACHED_BITMAP_SCALE) { 119 bitmap = null; 120 } else if (drawableHeight > bitmapHeight 121 && bitmapHeight < VIEWBOX_HEIGHT * MAX_CACHED_BITMAP_SCALE) { 122 bitmap = null; 123 } 124 } 125 126 if (bitmap == null) { 127 // Reset the paint so it can be used to draw the paths in renderOnCanvas 128 mTempPaint.reset(); 129 130 bitmap = createBitmapCache(drawableWidth, drawableHeight); 131 sBitmapCache = new SoftReference<>(bitmap); 132 133 // Reset the paint to so it can be used to draw the bitmap 134 mTempPaint.reset(); 135 } 136 137 canvas.save(); 138 canvas.clipRect(bounds); 139 140 scaleCanvasToBounds(canvas, bitmap, bounds); 141 canvas.drawColor(Color.BLACK); 142 mTempPaint.setColor(Color.WHITE); 143 canvas.drawBitmap(bitmap, 0, 0, mTempPaint); 144 canvas.drawColor(mColor); 145 146 canvas.restore(); 147 } 148 149 @VisibleForTesting 150 public Bitmap createBitmapCache(int drawableWidth, int drawableHeight) { 151 float scaleX = drawableWidth / VIEWBOX_WIDTH; 152 float scaleY = drawableHeight / VIEWBOX_HEIGHT; 153 float scale = Math.max(scaleX, scaleY); 154 scale = Math.min(MAX_CACHED_BITMAP_SCALE, scale); 155 156 157 int scaledWidth = (int) (VIEWBOX_WIDTH * scale); 158 int scaledHeight = (int) (VIEWBOX_HEIGHT * scale); 159 160 // Use ALPHA_8 mask to save memory, since the pattern is grayscale only anyway. 161 Bitmap bitmap = Bitmap.createBitmap( 162 scaledWidth, 163 scaledHeight, 164 Bitmap.Config.ALPHA_8); 165 Canvas bitmapCanvas = new Canvas(bitmap); 166 renderOnCanvas(bitmapCanvas, scale); 167 return bitmap; 168 } 169 170 private void renderOnCanvas(Canvas canvas, float scale) { 171 canvas.save(); 172 canvas.scale(scale, scale); 173 174 mTempPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC)); 175 176 // Draw the pattern by creating the paths, adjusting the colors and drawing them. The path 177 // values are extracted from the SVG of the pattern file. 178 179 if (sPatternPaths == null) { 180 sPatternPaths = new Path[NUM_PATHS]; 181 // Lightness values of the pattern, range 0 - 255 182 sPatternLightness = new int[] { 10, 40, 51, 66, 91, 112, 130 }; 183 184 Path p = sPatternPaths[0] = new Path(); 185 p.moveTo(1029.4f, 357.5f); 186 p.lineTo(1366f, 759.1f); 187 p.lineTo(1366f, 0f); 188 p.lineTo(1137.7f, 0f); 189 p.close(); 190 191 p = sPatternPaths[1] = new Path(); 192 p.moveTo(1138.1f, 0f); 193 p.rLineTo(-144.8f, 768f); 194 p.rLineTo(372.7f, 0f); 195 p.rLineTo(0f, -524f); 196 p.cubicTo(1290.7f, 121.6f, 1219.2f, 41.1f, 1178.7f, 0f); 197 p.close(); 198 199 p = sPatternPaths[2] = new Path(); 200 p.moveTo(949.8f, 768f); 201 p.rCubicTo(92.6f, -170.6f, 213f, -440.3f, 269.4f, -768f); 202 p.lineTo(585f, 0f); 203 p.rLineTo(2.1f, 766f); 204 p.close(); 205 206 p = sPatternPaths[3] = new Path(); 207 p.moveTo(471.1f, 768f); 208 p.rMoveTo(704.5f, 0f); 209 p.cubicTo(1123.6f, 563.3f, 1027.4f, 275.2f, 856.2f, 0f); 210 p.lineTo(476.4f, 0f); 211 p.rLineTo(-5.3f, 768f); 212 p.close(); 213 214 p = sPatternPaths[4] = new Path(); 215 p.moveTo(323.1f, 768f); 216 p.moveTo(777.5f, 768f); 217 p.cubicTo(661.9f, 348.8f, 427.2f, 21.4f, 401.2f, 25.4f); 218 p.lineTo(323.1f, 768f); 219 p.close(); 220 221 p = sPatternPaths[5] = new Path(); 222 p.moveTo(178.44286f, 766.8571f); 223 p.lineTo(308.7f, 768f); 224 p.cubicTo(381.7f, 604.6f, 481.6f, 344.3f, 562.2f, 0f); 225 p.lineTo(0f, 0f); 226 p.close(); 227 228 p = sPatternPaths[6] = new Path(); 229 p.moveTo(146f, 0f); 230 p.lineTo(0f, 0f); 231 p.lineTo(0f, 768f); 232 p.lineTo(394.2f, 768f); 233 p.cubicTo(327.7f, 475.3f, 228.5f, 201f, 146f, 0f); 234 p.close(); 235 } 236 237 for (int i = 0; i < NUM_PATHS; i++) { 238 // Color is 0xAARRGGBB, so alpha << 24 will create a color with (alpha)% black. 239 // Although the color components don't really matter, since the backing bitmap cache is 240 // ALPHA_8. 241 mTempPaint.setColor(sPatternLightness[i] << 24); 242 canvas.drawPath(sPatternPaths[i], mTempPaint); 243 } 244 245 canvas.restore(); 246 mTempPaint.reset(); 247 } 248 249 @VisibleForTesting 250 public void scaleCanvasToBounds(Canvas canvas, Bitmap bitmap, Rect drawableBounds) { 251 int bitmapWidth = bitmap.getWidth(); 252 int bitmapHeight = bitmap.getHeight(); 253 float scaleX = drawableBounds.width() / (float) bitmapWidth; 254 float scaleY = drawableBounds.height() / (float) bitmapHeight; 255 256 // First scale both sides to fit independently. 257 canvas.scale(scaleX, scaleY); 258 if (scaleY > scaleX) { 259 // Adjust x-scale to maintain aspect ratio using the pivot, so that more of the texture 260 // and less of the blank space on the left edge is seen. 261 canvas.scale(scaleY / scaleX, 1f, SCALE_FOCUS_X * bitmapWidth, 0f); 262 } else if (scaleX > scaleY) { 263 // Adjust y-scale to maintain aspect ratio using the pivot, so that an intersection of 264 // two "circles" can always be seen. 265 canvas.scale(1f, scaleX / scaleY, 0f, SCALE_FOCUS_Y * bitmapHeight); 266 } 267 } 268 269 @Override 270 public void setAlpha(int i) { 271 // Ignore 272 } 273 274 @Override 275 public void setColorFilter(ColorFilter colorFilter) { 276 // Ignore 277 } 278 279 @Override 280 public int getOpacity() { 281 return PixelFormat.UNKNOWN; 282 } 283 284 /** 285 * Sets the color used as the base color of this pattern drawable. The alpha component of the 286 * color will be ignored. 287 */ 288 public void setColor(int color) { 289 final int r = Color.red(color); 290 final int g = Color.green(color); 291 final int b = Color.blue(color); 292 mColor = Color.argb(COLOR_ALPHA_INT, r, g, b); 293 invalidateSelf(); 294 } 295 296 /** 297 * @return The color used as the base color of this pattern drawable. The alpha component of 298 * this is always 255. 299 */ 300 public int getColor() { 301 return Color.argb(255, Color.red(mColor), Color.green(mColor), Color.blue(mColor)); 302 } 303 } 304
