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        public java.awt.PaintContext createContext(
109                java.awt.image.ColorModel      colorModel,
110                java.awt.Rectangle             deviceBounds,
111                java.awt.geom.Rectangle2D      userBounds,
112                java.awt.geom.AffineTransform  xform,
113                java.awt.RenderingHints        hints) {
114
115            java.awt.geom.AffineTransform canvasMatrix;
116            try {
117                canvasMatrix = xform.createInverse();
118            } catch (java.awt.geom.NoninvertibleTransformException e) {
119                Bridge.getLog().fidelityWarning(LayoutLog.TAG_MATRIX_INVERSE,
120                        "Unable to inverse matrix in BitmapShader", e, null /*data*/);
121                canvasMatrix = new java.awt.geom.AffineTransform();
122            }
123
124            java.awt.geom.AffineTransform localMatrix = getLocalMatrix();
125            try {
126                localMatrix = localMatrix.createInverse();
127            } catch (java.awt.geom.NoninvertibleTransformException e) {
128                Bridge.getLog().fidelityWarning(LayoutLog.TAG_MATRIX_INVERSE,
129                        "Unable to inverse matrix in BitmapShader", e, null /*data*/);
130                localMatrix = new java.awt.geom.AffineTransform();
131            }
132
133            return new BitmapShaderContext(canvasMatrix, localMatrix, colorModel);
134        }
135
136        private class BitmapShaderContext implements java.awt.PaintContext {
137
138            private final java.awt.geom.AffineTransform mCanvasMatrix;
139            private final java.awt.geom.AffineTransform mLocalMatrix;
140            private final java.awt.image.ColorModel mColorModel;
141
142            public BitmapShaderContext(
143                    java.awt.geom.AffineTransform canvasMatrix,
144                    java.awt.geom.AffineTransform localMatrix,
145                    java.awt.image.ColorModel colorModel) {
146                mCanvasMatrix = canvasMatrix;
147                mLocalMatrix = localMatrix;
148                mColorModel = colorModel;
149            }
150
151            public void dispose() {
152            }
153
154            public java.awt.image.ColorModel getColorModel() {
155                return mColorModel;
156            }
157
158            public java.awt.image.Raster getRaster(int x, int y, int w, int h) {
159                java.awt.image.BufferedImage image = new java.awt.image.BufferedImage(w, h,
160                        java.awt.image.BufferedImage.TYPE_INT_ARGB);
161
162                int[] data = new int[w*h];
163
164                int index = 0;
165                float[] pt1 = new float[2];
166                float[] pt2 = new float[2];
167                for (int iy = 0 ; iy < h ; iy++) {
168                    for (int ix = 0 ; ix < w ; ix++) {
169                        // handle the canvas transform
170                        pt1[0] = x + ix;
171                        pt1[1] = y + iy;
172                        mCanvasMatrix.transform(pt1, 0, pt2, 0, 1);
173
174                        // handle the local matrix.
175                        pt1[0] = pt2[0];
176                        pt1[1] = pt2[1];
177                        mLocalMatrix.transform(pt1, 0, pt2, 0, 1);
178
179                        data[index++] = getColor(pt2[0], pt2[1]);
180                    }
181                }
182
183                image.setRGB(0 /*startX*/, 0 /*startY*/, w, h, data, 0 /*offset*/, w /*scansize*/);
184
185                return image.getRaster();
186            }
187        }
188
189        /**
190         * Returns a color for an arbitrary point.
191         */
192        private int getColor(float fx, float fy) {
193            int x = getCoordinate(Math.round(fx), mImage.getWidth(), mTileModeX);
194            int y = getCoordinate(Math.round(fy), mImage.getHeight(), mTileModeY);
195
196            return mImage.getRGB(x, y);
197        }
198
199        private int getCoordinate(int i, int size, TileMode mode) {
200            if (i < 0) {
201                switch (mode) {
202                    case CLAMP:
203                        i = 0;
204                        break;
205                    case REPEAT:
206                        i = size - 1 - (-i % size);
207                        break;
208                    case MIRROR:
209                        // this is the same as the positive side, just make the value positive
210                        // first.
211                        i = -i;
212                        int count = i / size;
213                        i = i % size;
214
215                        if ((count % 2) == 1) {
216                            i = size - 1 - i;
217                        }
218                        break;
219                }
220            } else if (i >= size) {
221                switch (mode) {
222                    case CLAMP:
223                        i = size - 1;
224                        break;
225                    case REPEAT:
226                        i = i % size;
227                        break;
228                    case MIRROR:
229                        int count = i / size;
230                        i = i % size;
231
232                        if ((count % 2) == 1) {
233                            i = size - 1 - i;
234                        }
235                        break;
236                }
237            }
238
239            return i;
240        }
241
242
243        public int getTransparency() {
244            return java.awt.Paint.TRANSLUCENT;
245        }
246    }
247}
248