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1/*
2 * Copyright (C) 2010 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
17package android.graphics;
18
19import com.android.ide.common.rendering.api.LayoutLog;
20import com.android.layoutlib.bridge.Bridge;
21import com.android.layoutlib.bridge.impl.DelegateManager;
22import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
23
24import android.graphics.Shader.TileMode;
25
26import java.awt.PaintContext;
27import java.awt.Rectangle;
28import java.awt.RenderingHints;
29import java.awt.geom.AffineTransform;
30import java.awt.geom.NoninvertibleTransformException;
31import java.awt.geom.Rectangle2D;
32import java.awt.image.BufferedImage;
33import java.awt.image.ColorModel;
34import java.awt.image.Raster;
35
36/**
37 * Delegate implementing the native methods of android.graphics.BitmapShader
38 *
39 * Through the layoutlib_create tool, the original native methods of BitmapShader have been
40 * replaced by calls to methods of the same name in this delegate class.
41 *
42 * This class behaves like the original native implementation, but in Java, keeping previously
43 * native data into its own objects and mapping them to int that are sent back and forth between
44 * it and the original BitmapShader class.
45 *
46 * Because this extends {@link Shader_Delegate}, there's no need to use a {@link DelegateManager},
47 * as all the Shader classes will be added to the manager owned by {@link Shader_Delegate}.
48 *
49 * @see Shader_Delegate
50 *
51 */
52public class BitmapShader_Delegate extends Shader_Delegate {
53
54    // ---- delegate data ----
55    private java.awt.Paint mJavaPaint;
56
57    // ---- Public Helper methods ----
58
59    @Override
60    public java.awt.Paint getJavaPaint() {
61        return mJavaPaint;
62    }
63
64    @Override
65    public boolean isSupported() {
66        return true;
67    }
68
69    @Override
70    public String getSupportMessage() {
71        // no message since isSupported returns true;
72        return null;
73    }
74
75    // ---- native methods ----
76
77    @LayoutlibDelegate
78    /*package*/ static long nativeCreate(Bitmap androidBitmap, int shaderTileModeX,
79            int shaderTileModeY) {
80        Bitmap_Delegate bitmap = Bitmap_Delegate.getDelegate(androidBitmap);
81        if (bitmap == null) {
82            return 0;
83        }
84
85        BitmapShader_Delegate newDelegate = new BitmapShader_Delegate(
86                bitmap.getImage(),
87                Shader_Delegate.getTileMode(shaderTileModeX),
88                Shader_Delegate.getTileMode(shaderTileModeY));
89        return sManager.addNewDelegate(newDelegate);
90    }
91
92    // ---- Private delegate/helper methods ----
93
94    private BitmapShader_Delegate(BufferedImage image,
95            TileMode tileModeX, TileMode tileModeY) {
96        mJavaPaint = new BitmapShaderPaint(image, tileModeX, tileModeY);
97    }
98
99    private class BitmapShaderPaint implements java.awt.Paint {
100        private final BufferedImage mImage;
101        private final TileMode mTileModeX;
102        private final TileMode mTileModeY;
103
104        BitmapShaderPaint(BufferedImage image,
105                TileMode tileModeX, TileMode tileModeY) {
106            mImage = image;
107            mTileModeX = tileModeX;
108            mTileModeY = tileModeY;
109        }
110
111        @Override
112        public PaintContext createContext(ColorModel colorModel, Rectangle deviceBounds,
113                Rectangle2D userBounds, AffineTransform xform, RenderingHints hints) {
114            AffineTransform canvasMatrix;
115            try {
116                canvasMatrix = xform.createInverse();
117            } catch (NoninvertibleTransformException e) {
118                Bridge.getLog().fidelityWarning(LayoutLog.TAG_MATRIX_INVERSE,
119                        "Unable to inverse matrix in BitmapShader", e, null /*data*/);
120                canvasMatrix = new AffineTransform();
121            }
122
123            AffineTransform localMatrix = getLocalMatrix();
124            try {
125                localMatrix = localMatrix.createInverse();
126            } catch (NoninvertibleTransformException e) {
127                Bridge.getLog().fidelityWarning(LayoutLog.TAG_MATRIX_INVERSE,
128                        "Unable to inverse matrix in BitmapShader", e, null /*data*/);
129                localMatrix = new AffineTransform();
130            }
131
132            if (!colorModel.isCompatibleRaster(mImage.getRaster())) {
133                // Fallback to the default ARGB color model
134                colorModel = ColorModel.getRGBdefault();
135            }
136
137            return new BitmapShaderContext(canvasMatrix, localMatrix, colorModel);
138        }
139
140        private class BitmapShaderContext implements PaintContext {
141
142            private final AffineTransform mCanvasMatrix;
143            private final AffineTransform mLocalMatrix;
144            private final ColorModel mColorModel;
145
146            public BitmapShaderContext(
147                    AffineTransform canvasMatrix,
148                    AffineTransform localMatrix,
149                    ColorModel colorModel) {
150                mCanvasMatrix = canvasMatrix;
151                mLocalMatrix = localMatrix;
152                mColorModel = colorModel;
153            }
154
155            @Override
156            public void dispose() {
157            }
158
159            @Override
160            public ColorModel getColorModel() {
161                return mColorModel;
162            }
163
164            @Override
165            public Raster getRaster(int x, int y, int w, int h) {
166                BufferedImage image = new BufferedImage(
167                    mColorModel, mColorModel.createCompatibleWritableRaster(w, h),
168                    mColorModel.isAlphaPremultiplied(), null);
169
170                int[] data = new int[w*h];
171
172                int index = 0;
173                float[] pt1 = new float[2];
174                float[] pt2 = new float[2];
175                for (int iy = 0 ; iy < h ; iy++) {
176                    for (int ix = 0 ; ix < w ; ix++) {
177                        // handle the canvas transform
178                        pt1[0] = x + ix;
179                        pt1[1] = y + iy;
180                        mCanvasMatrix.transform(pt1, 0, pt2, 0, 1);
181
182                        // handle the local matrix.
183                        pt1[0] = pt2[0];
184                        pt1[1] = pt2[1];
185                        mLocalMatrix.transform(pt1, 0, pt2, 0, 1);
186
187                        data[index++] = getColor(pt2[0], pt2[1]);
188                    }
189                }
190
191                image.setRGB(0 /*startX*/, 0 /*startY*/, w, h, data, 0 /*offset*/, w /*scansize*/);
192
193                return image.getRaster();
194            }
195        }
196
197        /**
198         * Returns a color for an arbitrary point.
199         */
200        private int getColor(float fx, float fy) {
201            int x = getCoordinate(Math.round(fx), mImage.getWidth(), mTileModeX);
202            int y = getCoordinate(Math.round(fy), mImage.getHeight(), mTileModeY);
203
204            return mImage.getRGB(x, y);
205        }
206
207        private int getCoordinate(int i, int size, TileMode mode) {
208            if (i < 0) {
209                switch (mode) {
210                    case CLAMP:
211                        i = 0;
212                        break;
213                    case REPEAT:
214                        i = size - 1 - (-i % size);
215                        break;
216                    case MIRROR:
217                        // this is the same as the positive side, just make the value positive
218                        // first.
219                        i = -i;
220                        int count = i / size;
221                        i = i % size;
222
223                        if ((count % 2) == 1) {
224                            i = size - 1 - i;
225                        }
226                        break;
227                }
228            } else if (i >= size) {
229                switch (mode) {
230                    case CLAMP:
231                        i = size - 1;
232                        break;
233                    case REPEAT:
234                        i = i % size;
235                        break;
236                    case MIRROR:
237                        int count = i / size;
238                        i = i % size;
239
240                        if ((count % 2) == 1) {
241                            i = size - 1 - i;
242                        }
243                        break;
244                }
245            }
246
247            return i;
248        }
249
250
251        @Override
252        public int getTransparency() {
253            return java.awt.Paint.TRANSLUCENT;
254        }
255    }
256}
257