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 
17 package android.graphics;
18 
19 import com.android.ide.common.rendering.api.LayoutLog;
20 import com.android.layoutlib.bridge.Bridge;
21 import com.android.layoutlib.bridge.impl.DelegateManager;
22 import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
23 
24 import 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  */
42 public class BitmapShader_Delegate extends Shader_Delegate {
43 
44     // ---- delegate data ----
45     private java.awt.Paint mJavaPaint;
46 
47     // ---- Public Helper methods ----
48 
49     @Override
getJavaPaint()50     public java.awt.Paint getJavaPaint() {
51         return mJavaPaint;
52     }
53 
54     @Override
isSupported()55     public boolean isSupported() {
56         return true;
57     }
58 
59     @Override
getSupportMessage()60     public String getSupportMessage() {
61         // no message since isSupported returns true;
62         return null;
63     }
64 
65     // ---- native methods ----
66 
67     @LayoutlibDelegate
nativeCreate(long native_bitmap, int shaderTileModeX, int shaderTileModeY)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 
BitmapShader_Delegate(java.awt.image.BufferedImage image, TileMode tileModeX, TileMode tileModeY)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 
BitmapShaderPaint(java.awt.image.BufferedImage image, TileMode tileModeX, TileMode tileModeY)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
createContext( java.awt.image.ColorModel colorModel, java.awt.Rectangle deviceBounds, java.awt.geom.Rectangle2D userBounds, java.awt.geom.AffineTransform xform, java.awt.RenderingHints hints)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 
BitmapShaderContext( java.awt.geom.AffineTransform canvasMatrix, java.awt.geom.AffineTransform localMatrix, java.awt.image.ColorModel colorModel)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
dispose()146             public void dispose() {
147             }
148 
149             @Override
getColorModel()150             public java.awt.image.ColorModel getColorModel() {
151                 return mColorModel;
152             }
153 
154             @Override
getRaster(int x, int y, int w, int h)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          */
getColor(float fx, float fy)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 
getCoordinate(int i, int size, TileMode mode)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
getTransparency()241         public int getTransparency() {
242             return java.awt.Paint.TRANSLUCENT;
243         }
244     }
245 }
246