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author | Sunny Goyal <sunnygoyal@google.com> | 2016-07-19 14:19:53 -0700 |
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committer | Sunny Goyal <sunnygoyal@google.com> | 2016-07-20 11:26:22 -0700 |
commit | 4a464794f202c6e913ff0ea442d248e86bebbd12 (patch) | |
tree | ba45ff264757e0c20f4217e36e0729f2061a1231 /src/com/android/launcher3/graphics | |
parent | 77ba6b9cad542a78910b6d7c638a1254b31d79ab (diff) | |
download | android_packages_apps_Trebuchet-4a464794f202c6e913ff0ea442d248e86bebbd12.tar.gz android_packages_apps_Trebuchet-4a464794f202c6e913ff0ea442d248e86bebbd12.tar.bz2 android_packages_apps_Trebuchet-4a464794f202c6e913ff0ea442d248e86bebbd12.zip |
Adding support for dynamically adding shadows to the icon
Change-Id: I94d98750aea1faef8879e25990aa5c41a4894708
Diffstat (limited to 'src/com/android/launcher3/graphics')
-rw-r--r-- | src/com/android/launcher3/graphics/ShadowGenerator.java | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/src/com/android/launcher3/graphics/ShadowGenerator.java b/src/com/android/launcher3/graphics/ShadowGenerator.java new file mode 100644 index 000000000..2b24ec932 --- /dev/null +++ b/src/com/android/launcher3/graphics/ShadowGenerator.java @@ -0,0 +1,114 @@ +/* + * Copyright (C) 2016 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 com.android.launcher3.graphics; + +import android.graphics.Bitmap; +import android.graphics.Bitmap.Config; +import android.graphics.BlurMaskFilter; +import android.graphics.BlurMaskFilter.Blur; +import android.graphics.Canvas; +import android.graphics.Paint; +import android.graphics.RectF; + +import com.android.launcher3.LauncherAppState; +import com.android.launcher3.util.Preconditions; + +/** + * Utility class to add shadows to bitmaps. + */ +public class ShadowGenerator { + + // Percent of actual icon size + private static final float HALF_DISTANCE = 0.5f; + private static final float BLUR_FACTOR = 0.5f/48; + + // Percent of actual icon size + private static final float KEY_SHADOW_DISTANCE = 1f/48; + private static final int KEY_SHADOW_ALPHA = 61; + + private static final int AMBIENT_SHADOW_ALPHA = 30; + + private static final Object LOCK = new Object(); + // Singleton object guarded by {@link #LOCK} + private static ShadowGenerator sShadowGenerator; + + private final int mIconSize; + + private final Canvas mCanvas; + private final Paint mBlurPaint; + private final Paint mDrawPaint; + + private ShadowGenerator() { + mIconSize = LauncherAppState.getInstance().getInvariantDeviceProfile().iconBitmapSize; + mCanvas = new Canvas(); + mBlurPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG); + mBlurPaint.setMaskFilter(new BlurMaskFilter(mIconSize * BLUR_FACTOR, Blur.NORMAL)); + mDrawPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG); + } + + public synchronized Bitmap recreateIcon(Bitmap icon) { + int[] offset = new int[2]; + Bitmap shadow = icon.extractAlpha(mBlurPaint, offset); + Bitmap result = Bitmap.createBitmap(mIconSize, mIconSize, Config.ARGB_8888); + mCanvas.setBitmap(result); + + // Draw ambient shadow + mDrawPaint.setAlpha(AMBIENT_SHADOW_ALPHA); + mCanvas.drawBitmap(shadow, offset[0], offset[1], mDrawPaint); + + // Draw key shadow + mDrawPaint.setAlpha(KEY_SHADOW_ALPHA); + mCanvas.drawBitmap(shadow, offset[0], offset[1] + KEY_SHADOW_DISTANCE * mIconSize, mDrawPaint); + + // Draw the icon + mDrawPaint.setAlpha(255); + mCanvas.drawBitmap(icon, 0, 0, mDrawPaint); + + mCanvas.setBitmap(null); + return result; + } + + public static ShadowGenerator getInstance() { + Preconditions.assertNonUiThread(); + synchronized (LOCK) { + if (sShadowGenerator == null) { + sShadowGenerator = new ShadowGenerator(); + } + } + return sShadowGenerator; + } + + /** + * Returns the minimum amount by which an icon with {@param bounds} should be scaled + * so that the shadows do not get clipped. + */ + public static float getScaleForBounds(RectF bounds) { + float scale = 1; + + // For top, left & right, we need same space. + float minSide = Math.min(Math.min(bounds.left, bounds.right), bounds.top); + if (minSide < BLUR_FACTOR) { + scale = (HALF_DISTANCE - BLUR_FACTOR) / (HALF_DISTANCE - minSide); + } + + float bottomSpace = BLUR_FACTOR + KEY_SHADOW_DISTANCE; + if (bounds.bottom < bottomSpace) { + scale = Math.min(scale, (HALF_DISTANCE - bottomSpace) / (HALF_DISTANCE - bounds.bottom)); + } + return scale; + } +} |