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      1 /*
      2  * Copyright (C) 2012 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.gallery3d.filtershow.filters;
     18 
     19 import android.graphics.Bitmap;
     20 import android.graphics.BitmapFactory;
     21 import android.graphics.Canvas;
     22 import android.graphics.Color;
     23 import android.graphics.Matrix;
     24 import android.graphics.Paint;
     25 import android.graphics.Paint.Style;
     26 import android.graphics.Path;
     27 import android.graphics.PathMeasure;
     28 import android.graphics.PorterDuff;
     29 import android.graphics.PorterDuffColorFilter;
     30 
     31 import com.android.gallery3d.R;
     32 import com.android.gallery3d.filtershow.filters.FilterDrawRepresentation.StrokeData;
     33 import com.android.gallery3d.filtershow.imageshow.MasterImage;
     34 import com.android.gallery3d.filtershow.presets.ImagePreset;
     35 
     36 import java.util.Vector;
     37 
     38 public class ImageFilterDraw extends ImageFilter {
     39     private static final String LOGTAG = "ImageFilterDraw";
     40     public final static byte SIMPLE_STYLE = 0;
     41     public final static byte BRUSH_STYLE_SPATTER = 1;
     42     public final static byte BRUSH_STYLE_MARKER = 2;
     43     public final static int NUMBER_OF_STYLES = 3;
     44     Bitmap mOverlayBitmap; // this accelerates interaction
     45     int mCachedStrokes = -1;
     46     int mCurrentStyle = 0;
     47 
     48     FilterDrawRepresentation mParameters = new FilterDrawRepresentation();
     49 
     50     public ImageFilterDraw() {
     51         mName = "Image Draw";
     52     }
     53 
     54     DrawStyle[] mDrawingsTypes = new DrawStyle[] {
     55             new SimpleDraw(),
     56             new Brush(R.drawable.brush_marker),
     57             new Brush(R.drawable.brush_spatter)
     58     };
     59     {
     60         for (int i = 0; i < mDrawingsTypes.length; i++) {
     61             mDrawingsTypes[i].setType((byte) i);
     62         }
     63 
     64     }
     65 
     66     @Override
     67     public FilterRepresentation getDefaultRepresentation() {
     68         return new FilterDrawRepresentation();
     69     }
     70 
     71     @Override
     72     public void useRepresentation(FilterRepresentation representation) {
     73         FilterDrawRepresentation parameters = (FilterDrawRepresentation) representation;
     74         mParameters = parameters;
     75     }
     76 
     77     public void setStyle(byte style) {
     78         mCurrentStyle = style % mDrawingsTypes.length;
     79     }
     80 
     81     public int getStyle() {
     82         return mCurrentStyle;
     83     }
     84 
     85     public static interface DrawStyle {
     86         public void setType(byte type);
     87         public void paint(FilterDrawRepresentation.StrokeData sd, Canvas canvas, Matrix toScrMatrix,
     88                 int quality);
     89     }
     90 
     91     class SimpleDraw implements DrawStyle {
     92         byte mType;
     93 
     94         @Override
     95         public void setType(byte type) {
     96             mType = type;
     97         }
     98 
     99         @Override
    100         public void paint(FilterDrawRepresentation.StrokeData sd, Canvas canvas, Matrix toScrMatrix,
    101                 int quality) {
    102             if (sd == null) {
    103                 return;
    104             }
    105             if (sd.mPath == null) {
    106                 return;
    107             }
    108             Paint paint = new Paint();
    109 
    110             paint.setStyle(Style.STROKE);
    111             paint.setColor(sd.mColor);
    112             paint.setStrokeWidth(toScrMatrix.mapRadius(sd.mRadius));
    113 
    114             // done this way because of a bug in path.transform(matrix)
    115             Path mCacheTransPath = new Path();
    116             mCacheTransPath.addPath(sd.mPath, toScrMatrix);
    117 
    118             canvas.drawPath(mCacheTransPath, paint);
    119         }
    120     }
    121 
    122     class Brush implements DrawStyle {
    123         int mBrushID;
    124         Bitmap mBrush;
    125         byte mType;
    126 
    127         public Brush(int brushID) {
    128             mBrushID = brushID;
    129         }
    130         public Bitmap getBrush() {
    131             if (mBrush == null) {
    132                 BitmapFactory.Options opt = new BitmapFactory.Options();
    133                 opt.inPreferredConfig = Bitmap.Config.ALPHA_8;
    134                 mBrush = MasterImage.getImage().getImageLoader().decodeImage(mBrushID, opt);
    135                 mBrush = mBrush.extractAlpha();
    136             }
    137             return mBrush;
    138         }
    139 
    140         @Override
    141         public void paint(FilterDrawRepresentation.StrokeData sd, Canvas canvas, Matrix toScrMatrix,
    142                 int quality) {
    143             if (sd == null || sd.mPath == null) {
    144                 return;
    145             }
    146             Paint paint = new Paint();
    147             paint.setStyle(Style.STROKE);
    148             paint.setAntiAlias(true);
    149             Path mCacheTransPath = new Path();
    150             mCacheTransPath.addPath(sd.mPath, toScrMatrix);
    151             draw(canvas, paint, sd.mColor, toScrMatrix.mapRadius(sd.mRadius) * 2,
    152                     mCacheTransPath);
    153         }
    154 
    155         public Bitmap createScaledBitmap(Bitmap src, int dstWidth, int dstHeight, boolean filter)
    156         {
    157             Matrix m = new Matrix();
    158             m.setScale(dstWidth / (float) src.getWidth(), dstHeight / (float) src.getHeight());
    159             Bitmap result = Bitmap.createBitmap(dstWidth, dstHeight, src.getConfig());
    160             Canvas canvas = new Canvas(result);
    161 
    162             Paint paint = new Paint();
    163             paint.setFilterBitmap(filter);
    164             canvas.drawBitmap(src, m, paint);
    165 
    166             return result;
    167 
    168         }
    169         void draw(Canvas canvas, Paint paint, int color, float size, Path path) {
    170             PathMeasure mPathMeasure = new PathMeasure();
    171             float[] mPosition = new float[2];
    172             float[] mTan = new float[2];
    173 
    174             mPathMeasure.setPath(path, false);
    175 
    176             paint.setAntiAlias(true);
    177             paint.setColor(color);
    178 
    179             paint.setColorFilter(new PorterDuffColorFilter(color, PorterDuff.Mode.MULTIPLY));
    180             Bitmap brush;
    181             // done this way because of a bug in
    182             // Bitmap.createScaledBitmap(getBrush(),(int) size,(int) size,true);
    183             brush = createScaledBitmap(getBrush(), (int) size, (int) size, true);
    184             float len = mPathMeasure.getLength();
    185             float s2 = size / 2;
    186             float step = s2 / 8;
    187             for (float i = 0; i < len; i += step) {
    188                 mPathMeasure.getPosTan(i, mPosition, mTan);
    189                 //                canvas.drawCircle(pos[0], pos[1], size, paint);
    190                 canvas.drawBitmap(brush, mPosition[0] - s2, mPosition[1] - s2, paint);
    191             }
    192         }
    193 
    194         @Override
    195         public void setType(byte type) {
    196             mType = type;
    197         }
    198     }
    199 
    200     void paint(FilterDrawRepresentation.StrokeData sd, Canvas canvas, Matrix toScrMatrix,
    201             int quality) {
    202         mDrawingsTypes[sd.mType].paint(sd, canvas, toScrMatrix, quality);
    203     }
    204 
    205     public void drawData(Canvas canvas, Matrix originalRotateToScreen, int quality) {
    206         Paint paint = new Paint();
    207         if (quality == ImagePreset.QUALITY_FINAL) {
    208             paint.setAntiAlias(true);
    209         }
    210         paint.setStyle(Style.STROKE);
    211         paint.setColor(Color.RED);
    212         paint.setStrokeWidth(40);
    213 
    214         if (mParameters.getDrawing().isEmpty() && mParameters.getCurrentDrawing() == null) {
    215             return;
    216         }
    217         if (quality == ImagePreset.QUALITY_FINAL) {
    218             for (FilterDrawRepresentation.StrokeData strokeData : mParameters.getDrawing()) {
    219                 paint(strokeData, canvas, originalRotateToScreen, quality);
    220             }
    221             return;
    222         }
    223 
    224         if (mOverlayBitmap == null ||
    225                 mOverlayBitmap.getWidth() != canvas.getWidth() ||
    226                 mOverlayBitmap.getHeight() != canvas.getHeight() ||
    227                 mParameters.getDrawing().size() < mCachedStrokes) {
    228 
    229             mOverlayBitmap = Bitmap.createBitmap(
    230                     canvas.getWidth(), canvas.getHeight(), Bitmap.Config.ARGB_8888);
    231             mCachedStrokes = 0;
    232         }
    233 
    234         if (mCachedStrokes < mParameters.getDrawing().size()) {
    235             fillBuffer(originalRotateToScreen);
    236         }
    237         canvas.drawBitmap(mOverlayBitmap, 0, 0, paint);
    238 
    239         StrokeData stroke = mParameters.getCurrentDrawing();
    240         if (stroke != null) {
    241             paint(stroke, canvas, originalRotateToScreen, quality);
    242         }
    243     }
    244 
    245     public void fillBuffer(Matrix originalRotateToScreen) {
    246         Canvas drawCache = new Canvas(mOverlayBitmap);
    247         Vector<FilterDrawRepresentation.StrokeData> v = mParameters.getDrawing();
    248         int n = v.size();
    249 
    250         for (int i = mCachedStrokes; i < n; i++) {
    251             paint(v.get(i), drawCache, originalRotateToScreen, ImagePreset.QUALITY_PREVIEW);
    252         }
    253         mCachedStrokes = n;
    254     }
    255 
    256     public void draw(Canvas canvas, Matrix originalRotateToScreen) {
    257         for (FilterDrawRepresentation.StrokeData strokeData : mParameters.getDrawing()) {
    258             paint(strokeData, canvas, originalRotateToScreen, ImagePreset.QUALITY_PREVIEW);
    259         }
    260         mDrawingsTypes[mCurrentStyle].paint(
    261                 null, canvas, originalRotateToScreen, ImagePreset.QUALITY_PREVIEW);
    262     }
    263 
    264     @Override
    265     public Bitmap apply(Bitmap bitmap, float scaleFactor, int quality) {
    266         int w = bitmap.getWidth();
    267         int h = bitmap.getHeight();
    268 
    269         Matrix m = getOriginalToScreenMatrix(w, h);
    270         drawData(new Canvas(bitmap), m, quality);
    271         return bitmap;
    272     }
    273 
    274 }
    275