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