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      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.animation.ObjectAnimator;
     20 import android.animation.TimeInterpolator;
     21 import android.graphics.Bitmap;
     22 import android.graphics.Canvas;
     23 import android.graphics.Color;
     24 import android.graphics.ColorFilter;
     25 import android.graphics.ColorMatrix;
     26 import android.graphics.ColorMatrixColorFilter;
     27 import android.graphics.Paint;
     28 import android.graphics.PixelFormat;
     29 import android.graphics.PorterDuff;
     30 import android.graphics.PorterDuffColorFilter;
     31 import android.graphics.Rect;
     32 import android.graphics.drawable.Drawable;
     33 import android.util.SparseArray;
     34 
     35 class FastBitmapDrawable extends Drawable {
     36 
     37     static final TimeInterpolator CLICK_FEEDBACK_INTERPOLATOR = new TimeInterpolator() {
     38 
     39         @Override
     40         public float getInterpolation(float input) {
     41             if (input < 0.05f) {
     42                 return input / 0.05f;
     43             } else if (input < 0.3f){
     44                 return 1;
     45             } else {
     46                 return (1 - input) / 0.7f;
     47             }
     48         }
     49     };
     50     static final long CLICK_FEEDBACK_DURATION = 2000;
     51 
     52     private static final int PRESSED_BRIGHTNESS = 100;
     53     private static ColorMatrix sGhostModeMatrix;
     54     private static final ColorMatrix sTempMatrix = new ColorMatrix();
     55 
     56     /**
     57      * Store the brightness colors filters to optimize animations during icon press. This
     58      * only works for non-ghost-mode icons.
     59      */
     60     private static final SparseArray<ColorFilter> sCachedBrightnessFilter =
     61             new SparseArray<ColorFilter>();
     62 
     63     private static final int GHOST_MODE_MIN_COLOR_RANGE = 130;
     64 
     65     private final Paint mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
     66     private final Bitmap mBitmap;
     67     private int mAlpha;
     68 
     69     private int mBrightness = 0;
     70     private boolean mGhostModeEnabled = false;
     71 
     72     private boolean mPressed = false;
     73     private ObjectAnimator mPressedAnimator;
     74 
     75     FastBitmapDrawable(Bitmap b) {
     76         mAlpha = 255;
     77         mBitmap = b;
     78         setBounds(0, 0, b.getWidth(), b.getHeight());
     79     }
     80 
     81     @Override
     82     public void draw(Canvas canvas) {
     83         final Rect r = getBounds();
     84         // Draw the bitmap into the bounding rect
     85         canvas.drawBitmap(mBitmap, null, r, mPaint);
     86     }
     87 
     88     @Override
     89     public void setColorFilter(ColorFilter cf) {
     90         // No op
     91     }
     92 
     93     @Override
     94     public int getOpacity() {
     95         return PixelFormat.TRANSLUCENT;
     96     }
     97 
     98     @Override
     99     public void setAlpha(int alpha) {
    100         mAlpha = alpha;
    101         mPaint.setAlpha(alpha);
    102     }
    103 
    104     @Override
    105     public void setFilterBitmap(boolean filterBitmap) {
    106         mPaint.setFilterBitmap(filterBitmap);
    107         mPaint.setAntiAlias(filterBitmap);
    108     }
    109 
    110     public int getAlpha() {
    111         return mAlpha;
    112     }
    113 
    114     @Override
    115     public int getIntrinsicWidth() {
    116         return mBitmap.getWidth();
    117     }
    118 
    119     @Override
    120     public int getIntrinsicHeight() {
    121         return mBitmap.getHeight();
    122     }
    123 
    124     @Override
    125     public int getMinimumWidth() {
    126         return getBounds().width();
    127     }
    128 
    129     @Override
    130     public int getMinimumHeight() {
    131         return getBounds().height();
    132     }
    133 
    134     public Bitmap getBitmap() {
    135         return mBitmap;
    136     }
    137 
    138     /**
    139      * When enabled, the icon is grayed out and the contrast is increased to give it a 'ghost'
    140      * appearance.
    141      */
    142     public void setGhostModeEnabled(boolean enabled) {
    143         if (mGhostModeEnabled != enabled) {
    144             mGhostModeEnabled = enabled;
    145             updateFilter();
    146         }
    147     }
    148 
    149     public void setPressed(boolean pressed) {
    150         if (mPressed != pressed) {
    151             mPressed = pressed;
    152             if (mPressed) {
    153                 mPressedAnimator = ObjectAnimator
    154                         .ofInt(this, "brightness", PRESSED_BRIGHTNESS)
    155                         .setDuration(CLICK_FEEDBACK_DURATION);
    156                 mPressedAnimator.setInterpolator(CLICK_FEEDBACK_INTERPOLATOR);
    157                 mPressedAnimator.start();
    158             } else if (mPressedAnimator != null) {
    159                 mPressedAnimator.cancel();
    160                 setBrightness(0);
    161             }
    162         }
    163         invalidateSelf();
    164     }
    165 
    166     public boolean isGhostModeEnabled() {
    167         return mGhostModeEnabled;
    168     }
    169 
    170     public int getBrightness() {
    171         return mBrightness;
    172     }
    173 
    174     public void setBrightness(int brightness) {
    175         if (mBrightness != brightness) {
    176             mBrightness = brightness;
    177             updateFilter();
    178             invalidateSelf();
    179         }
    180     }
    181 
    182     private void updateFilter() {
    183         if (mGhostModeEnabled) {
    184             if (sGhostModeMatrix == null) {
    185                 sGhostModeMatrix = new ColorMatrix();
    186                 sGhostModeMatrix.setSaturation(0);
    187 
    188                 // For ghost mode, set the color range to [GHOST_MODE_MIN_COLOR_RANGE, 255]
    189                 float range = (255 - GHOST_MODE_MIN_COLOR_RANGE) / 255.0f;
    190                 sTempMatrix.set(new float[] {
    191                         range, 0, 0, 0, GHOST_MODE_MIN_COLOR_RANGE,
    192                         0, range, 0, 0, GHOST_MODE_MIN_COLOR_RANGE,
    193                         0, 0, range, 0, GHOST_MODE_MIN_COLOR_RANGE,
    194                         0, 0, 0, 1, 0 });
    195                 sGhostModeMatrix.preConcat(sTempMatrix);
    196             }
    197 
    198             if (mBrightness == 0) {
    199                 mPaint.setColorFilter(new ColorMatrixColorFilter(sGhostModeMatrix));
    200             } else {
    201                 setBrightnessMatrix(sTempMatrix, mBrightness);
    202                 sTempMatrix.postConcat(sGhostModeMatrix);
    203                 mPaint.setColorFilter(new ColorMatrixColorFilter(sTempMatrix));
    204             }
    205         } else if (mBrightness != 0) {
    206             ColorFilter filter = sCachedBrightnessFilter.get(mBrightness);
    207             if (filter == null) {
    208                 filter = new PorterDuffColorFilter(Color.argb(mBrightness, 255, 255, 255),
    209                         PorterDuff.Mode.SRC_ATOP);
    210                 sCachedBrightnessFilter.put(mBrightness, filter);
    211             }
    212             mPaint.setColorFilter(filter);
    213         } else {
    214             mPaint.setColorFilter(null);
    215         }
    216     }
    217 
    218     private static void setBrightnessMatrix(ColorMatrix matrix, int brightness) {
    219         // Brightness: C-new = C-old*(1-amount) + amount
    220         float scale = 1 - brightness / 255.0f;
    221         matrix.setScale(scale, scale, scale, 1);
    222         float[] array = matrix.getArray();
    223 
    224         // Add the amount to RGB components of the matrix, as per the above formula.
    225         // Fifth elements in the array correspond to the constant being added to
    226         // red, blue, green, and alpha channel respectively.
    227         array[4] = brightness;
    228         array[9] = brightness;
    229         array[14] = brightness;
    230     }
    231 }
    232