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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.app.Log;
     33 import com.android.gallery3d.filtershow.cache.ImageLoader;
     34 import com.android.gallery3d.filtershow.filters.FilterDrawRepresentation.StrokeData;
     35 import com.android.gallery3d.filtershow.imageshow.MasterImage;
     36 import com.android.gallery3d.filtershow.pipeline.FilterEnvironment;
     37 
     38 import java.util.Vector;
     39 
     40 public class ImageFilterDraw extends ImageFilter {
     41     private static final String LOGTAG = "ImageFilterDraw";
     42     public final static byte SIMPLE_STYLE = 0;
     43     public final static byte BRUSH_STYLE_SPATTER = 1;
     44     public final static byte BRUSH_STYLE_MARKER = 2;
     45     public final static int NUMBER_OF_STYLES = 3;
     46     Bitmap mOverlayBitmap; // this accelerates interaction
     47     int mCachedStrokes = -1;
     48     int mCurrentStyle = 0;
     49 
     50     FilterDrawRepresentation mParameters = new FilterDrawRepresentation();
     51 
     52     public ImageFilterDraw() {
     53         mName = "Image Draw";
     54     }
     55 
     56     DrawStyle[] mDrawingsTypes = new DrawStyle[] {
     57             new SimpleDraw(0),
     58             new SimpleDraw(1),
     59             new Brush(R.drawable.brush_gauss),
     60             new Brush(R.drawable.brush_marker),
     61             new Brush(R.drawable.brush_spatter)
     62     };
     63     {
     64         for (int i = 0; i < mDrawingsTypes.length; i++) {
     65             mDrawingsTypes[i].setType((byte) i);
     66         }
     67 
     68     }
     69 
     70     @Override
     71     public FilterRepresentation getDefaultRepresentation() {
     72         return new FilterDrawRepresentation();
     73     }
     74 
     75     @Override
     76     public void useRepresentation(FilterRepresentation representation) {
     77         FilterDrawRepresentation parameters = (FilterDrawRepresentation) representation;
     78         mParameters = parameters;
     79     }
     80 
     81     public void setStyle(byte style) {
     82         mCurrentStyle = style % mDrawingsTypes.length;
     83     }
     84 
     85     public int getStyle() {
     86         return mCurrentStyle;
     87     }
     88 
     89     public static interface DrawStyle {
     90         public void setType(byte type);
     91         public void paint(FilterDrawRepresentation.StrokeData sd, Canvas canvas, Matrix toScrMatrix,
     92                 int quality);
     93     }
     94 
     95     class SimpleDraw implements DrawStyle {
     96         byte mType;
     97         int mMode;
     98 
     99         public SimpleDraw(int mode) {
    100             mMode = mode;
    101         }
    102 
    103         @Override
    104         public void setType(byte type) {
    105             mType = type;
    106         }
    107 
    108         @Override
    109         public void paint(FilterDrawRepresentation.StrokeData sd, Canvas canvas, Matrix toScrMatrix,
    110                 int quality) {
    111             if (sd == null) {
    112                 return;
    113             }
    114             if (sd.mPath == null) {
    115                 return;
    116             }
    117             Paint paint = new Paint();
    118 
    119             paint.setStyle(Style.STROKE);
    120             if (mMode == 0) {
    121                 paint.setStrokeCap(Paint.Cap.SQUARE);
    122             } else {
    123                 paint.setStrokeCap(Paint.Cap.ROUND);
    124             }
    125             paint.setAntiAlias(true);
    126             paint.setColor(sd.mColor);
    127             paint.setStrokeWidth(toScrMatrix.mapRadius(sd.mRadius));
    128 
    129             // done this way because of a bug in path.transform(matrix)
    130             Path mCacheTransPath = new Path();
    131             mCacheTransPath.addPath(sd.mPath, toScrMatrix);
    132 
    133             canvas.drawPath(mCacheTransPath, paint);
    134         }
    135     }
    136 
    137     class Brush implements DrawStyle {
    138         int mBrushID;
    139         Bitmap mBrush;
    140         byte mType;
    141 
    142         public Brush(int brushID) {
    143             mBrushID = brushID;
    144         }
    145 
    146         public Bitmap getBrush() {
    147             if (mBrush == null) {
    148                 BitmapFactory.Options opt = new BitmapFactory.Options();
    149                 opt.inPreferredConfig = Bitmap.Config.ALPHA_8;
    150                 mBrush = BitmapFactory.decodeResource(MasterImage.getImage().getActivity()
    151                         .getResources(), mBrushID, opt);
    152                 mBrush = mBrush.extractAlpha();
    153             }
    154             return mBrush;
    155         }
    156 
    157         @Override
    158         public void paint(FilterDrawRepresentation.StrokeData sd, Canvas canvas,
    159                 Matrix toScrMatrix,
    160                 int quality) {
    161             if (sd == null || sd.mPath == null) {
    162                 return;
    163             }
    164             Paint paint = new Paint();
    165             paint.setStyle(Style.STROKE);
    166             paint.setAntiAlias(true);
    167             Path mCacheTransPath = new Path();
    168             mCacheTransPath.addPath(sd.mPath, toScrMatrix);
    169             draw(canvas, paint, sd.mColor, toScrMatrix.mapRadius(sd.mRadius) * 2,
    170                     mCacheTransPath);
    171         }
    172 
    173         public Bitmap createScaledBitmap(Bitmap src, int dstWidth, int dstHeight, boolean filter)
    174         {
    175             Matrix m = new Matrix();
    176             m.setScale(dstWidth / (float) src.getWidth(), dstHeight / (float) src.getHeight());
    177             Bitmap result = Bitmap.createBitmap(dstWidth, dstHeight, src.getConfig());
    178             Canvas canvas = new Canvas(result);
    179 
    180             Paint paint = new Paint();
    181             paint.setFilterBitmap(filter);
    182             canvas.drawBitmap(src, m, paint);
    183 
    184             return result;
    185 
    186         }
    187         void draw(Canvas canvas, Paint paint, int color, float size, Path path) {
    188             PathMeasure mPathMeasure = new PathMeasure();
    189             float[] mPosition = new float[2];
    190             float[] mTan = new float[2];
    191 
    192             mPathMeasure.setPath(path, false);
    193 
    194             paint.setAntiAlias(true);
    195             paint.setColor(color);
    196 
    197             paint.setColorFilter(new PorterDuffColorFilter(color, PorterDuff.Mode.MULTIPLY));
    198             Bitmap brush;
    199             // done this way because of a bug in
    200             // Bitmap.createScaledBitmap(getBrush(),(int) size,(int) size,true);
    201             brush = createScaledBitmap(getBrush(), (int) size, (int) size, true);
    202             float len = mPathMeasure.getLength();
    203             float s2 = size / 2;
    204             float step = s2 / 8;
    205             for (float i = 0; i < len; i += step) {
    206                 mPathMeasure.getPosTan(i, mPosition, mTan);
    207                 //                canvas.drawCircle(pos[0], pos[1], size, paint);
    208                 canvas.drawBitmap(brush, mPosition[0] - s2, mPosition[1] - s2, paint);
    209             }
    210         }
    211 
    212         @Override
    213         public void setType(byte type) {
    214             mType = type;
    215         }
    216     }
    217 
    218     void paint(FilterDrawRepresentation.StrokeData sd, Canvas canvas, Matrix toScrMatrix,
    219             int quality) {
    220         mDrawingsTypes[sd.mType].paint(sd, canvas, toScrMatrix, quality);
    221     }
    222 
    223     public void drawData(Canvas canvas, Matrix originalRotateToScreen, int quality) {
    224         Paint paint = new Paint();
    225         if (quality == FilterEnvironment.QUALITY_FINAL) {
    226             paint.setAntiAlias(true);
    227         }
    228         paint.setStyle(Style.STROKE);
    229         paint.setColor(Color.RED);
    230         paint.setStrokeWidth(40);
    231 
    232         if (mParameters.getDrawing().isEmpty() && mParameters.getCurrentDrawing() == null) {
    233             mOverlayBitmap = null;
    234             mCachedStrokes = -1;
    235             return;
    236         }
    237         if (quality == FilterEnvironment.QUALITY_FINAL) {
    238 
    239             for (FilterDrawRepresentation.StrokeData strokeData : mParameters.getDrawing()) {
    240                 paint(strokeData, canvas, originalRotateToScreen, quality);
    241             }
    242             return;
    243         }
    244 
    245         if (mOverlayBitmap == null ||
    246                 mOverlayBitmap.getWidth() != canvas.getWidth() ||
    247                 mOverlayBitmap.getHeight() != canvas.getHeight() ||
    248                 mParameters.getDrawing().size() < mCachedStrokes) {
    249 
    250             mOverlayBitmap = Bitmap.createBitmap(
    251                     canvas.getWidth(), canvas.getHeight(), Bitmap.Config.ARGB_8888);
    252             mCachedStrokes = 0;
    253         }
    254 
    255         if (mCachedStrokes < mParameters.getDrawing().size()) {
    256             fillBuffer(originalRotateToScreen);
    257         }
    258         canvas.drawBitmap(mOverlayBitmap, 0, 0, paint);
    259 
    260         StrokeData stroke = mParameters.getCurrentDrawing();
    261         if (stroke != null) {
    262             paint(stroke, canvas, originalRotateToScreen, quality);
    263         }
    264     }
    265 
    266     public void fillBuffer(Matrix originalRotateToScreen) {
    267         Canvas drawCache = new Canvas(mOverlayBitmap);
    268         Vector<FilterDrawRepresentation.StrokeData> v = mParameters.getDrawing();
    269         int n = v.size();
    270 
    271         for (int i = mCachedStrokes; i < n; i++) {
    272             paint(v.get(i), drawCache, originalRotateToScreen, FilterEnvironment.QUALITY_PREVIEW);
    273         }
    274         mCachedStrokes = n;
    275     }
    276 
    277     public void draw(Canvas canvas, Matrix originalRotateToScreen) {
    278         for (FilterDrawRepresentation.StrokeData strokeData : mParameters.getDrawing()) {
    279             paint(strokeData, canvas, originalRotateToScreen, FilterEnvironment.QUALITY_PREVIEW);
    280         }
    281         mDrawingsTypes[mCurrentStyle].paint(
    282                 null, canvas, originalRotateToScreen, FilterEnvironment.QUALITY_PREVIEW);
    283     }
    284 
    285     @Override
    286     public Bitmap apply(Bitmap bitmap, float scaleFactor, int quality) {
    287         int w = bitmap.getWidth();
    288         int h = bitmap.getHeight();
    289 
    290         Matrix m = getOriginalToScreenMatrix(w, h);
    291         drawData(new Canvas(bitmap), m, quality);
    292         return bitmap;
    293     }
    294 
    295 }
    296