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 int nativeCreate(int 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    @LayoutlibDelegate
83    /*package*/ static int nativePostCreate(int native_shader, int native_bitmap,
84            int shaderTileModeX, int shaderTileModeY) {
85        // pass, not needed.
86        return 0;
87    }
88
89    // ---- Private delegate/helper methods ----
90
91    private BitmapShader_Delegate(java.awt.image.BufferedImage image,
92            TileMode tileModeX, TileMode tileModeY) {
93        mJavaPaint = new BitmapShaderPaint(image, tileModeX, tileModeY);
94    }
95
96    private class BitmapShaderPaint implements java.awt.Paint {
97        private final java.awt.image.BufferedImage mImage;
98        private final TileMode mTileModeX;
99        private final TileMode mTileModeY;
100
101        BitmapShaderPaint(java.awt.image.BufferedImage image,
102                TileMode tileModeX, TileMode tileModeY) {
103            mImage = image;
104            mTileModeX = tileModeX;
105            mTileModeY = tileModeY;
106        }
107
108        @Override
109        public java.awt.PaintContext createContext(
110                java.awt.image.ColorModel      colorModel,
111                java.awt.Rectangle             deviceBounds,
112                java.awt.geom.Rectangle2D      userBounds,
113                java.awt.geom.AffineTransform  xform,
114                java.awt.RenderingHints        hints) {
115
116            java.awt.geom.AffineTransform canvasMatrix;
117            try {
118                canvasMatrix = xform.createInverse();
119            } catch (java.awt.geom.NoninvertibleTransformException e) {
120                Bridge.getLog().fidelityWarning(LayoutLog.TAG_MATRIX_INVERSE,
121                        "Unable to inverse matrix in BitmapShader", e, null /*data*/);
122                canvasMatrix = new java.awt.geom.AffineTransform();
123            }
124
125            java.awt.geom.AffineTransform localMatrix = getLocalMatrix();
126            try {
127                localMatrix = localMatrix.createInverse();
128            } catch (java.awt.geom.NoninvertibleTransformException e) {
129                Bridge.getLog().fidelityWarning(LayoutLog.TAG_MATRIX_INVERSE,
130                        "Unable to inverse matrix in BitmapShader", e, null /*data*/);
131                localMatrix = new java.awt.geom.AffineTransform();
132            }
133
134            return new BitmapShaderContext(canvasMatrix, localMatrix, colorModel);
135        }
136
137        private class BitmapShaderContext implements java.awt.PaintContext {
138
139            private final java.awt.geom.AffineTransform mCanvasMatrix;
140            private final java.awt.geom.AffineTransform mLocalMatrix;
141            private final java.awt.image.ColorModel mColorModel;
142
143            public BitmapShaderContext(
144                    java.awt.geom.AffineTransform canvasMatrix,
145                    java.awt.geom.AffineTransform localMatrix,
146                    java.awt.image.ColorModel colorModel) {
147                mCanvasMatrix = canvasMatrix;
148                mLocalMatrix = localMatrix;
149                mColorModel = colorModel;
150            }
151
152            @Override
153            public void dispose() {
154            }
155
156            @Override
157            public java.awt.image.ColorModel getColorModel() {
158                return mColorModel;
159            }
160
161            @Override
162            public java.awt.image.Raster getRaster(int x, int y, int w, int h) {
163                java.awt.image.BufferedImage image = new java.awt.image.BufferedImage(w, h,
164                        java.awt.image.BufferedImage.TYPE_INT_ARGB);
165
166                int[] data = new int[w*h];
167
168                int index = 0;
169                float[] pt1 = new float[2];
170                float[] pt2 = new float[2];
171                for (int iy = 0 ; iy < h ; iy++) {
172                    for (int ix = 0 ; ix < w ; ix++) {
173                        // handle the canvas transform
174                        pt1[0] = x + ix;
175                        pt1[1] = y + iy;
176                        mCanvasMatrix.transform(pt1, 0, pt2, 0, 1);
177
178                        // handle the local matrix.
179                        pt1[0] = pt2[0];
180                        pt1[1] = pt2[1];
181                        mLocalMatrix.transform(pt1, 0, pt2, 0, 1);
182
183                        data[index++] = getColor(pt2[0], pt2[1]);
184                    }
185                }
186
187                image.setRGB(0 /*startX*/, 0 /*startY*/, w, h, data, 0 /*offset*/, w /*scansize*/);
188
189                return image.getRaster();
190            }
191        }
192
193        /**
194         * Returns a color for an arbitrary point.
195         */
196        private int getColor(float fx, float fy) {
197            int x = getCoordinate(Math.round(fx), mImage.getWidth(), mTileModeX);
198            int y = getCoordinate(Math.round(fy), mImage.getHeight(), mTileModeY);
199
200            return mImage.getRGB(x, y);
201        }
202
203        private int getCoordinate(int i, int size, TileMode mode) {
204            if (i < 0) {
205                switch (mode) {
206                    case CLAMP:
207                        i = 0;
208                        break;
209                    case REPEAT:
210                        i = size - 1 - (-i % size);
211                        break;
212                    case MIRROR:
213                        // this is the same as the positive side, just make the value positive
214                        // first.
215                        i = -i;
216                        int count = i / size;
217                        i = i % size;
218
219                        if ((count % 2) == 1) {
220                            i = size - 1 - i;
221                        }
222                        break;
223                }
224            } else if (i >= size) {
225                switch (mode) {
226                    case CLAMP:
227                        i = size - 1;
228                        break;
229                    case REPEAT:
230                        i = i % size;
231                        break;
232                    case MIRROR:
233                        int count = i / size;
234                        i = i % size;
235
236                        if ((count % 2) == 1) {
237                            i = size - 1 - i;
238                        }
239                        break;
240                }
241            }
242
243            return i;
244        }
245
246
247        @Override
248        public int getTransparency() {
249            return java.awt.Paint.TRANSLUCENT;
250        }
251    }
252}
253