The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 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.view; |
| 18 | |
| 19 | import android.graphics.Canvas; |
| 20 | import android.graphics.Rect; |
| 21 | import static android.view.WindowManager.LayoutParams.MEMORY_TYPE_NORMAL; |
| 22 | import static android.view.WindowManager.LayoutParams.MEMORY_TYPE_HARDWARE; |
| 23 | import static android.view.WindowManager.LayoutParams.MEMORY_TYPE_GPU; |
| 24 | import static android.view.WindowManager.LayoutParams.MEMORY_TYPE_PUSH_BUFFERS; |
| 25 | |
| 26 | /** |
| 27 | * Abstract interface to someone holding a display surface. Allows you to |
| 28 | * control the surface size and format, edit the pixels in the surface, and |
| 29 | * monitor changes to the surface. This interface is typically available |
| 30 | * through the {@link SurfaceView} class. |
| 31 | * |
| 32 | * <p>When using this interface from a thread different than the one running |
| 33 | * its {@link SurfaceView}, you will want to carefully read the |
| 34 | * {@link #lockCanvas} and {@link Callback#surfaceCreated Callback.surfaceCreated}. |
| 35 | */ |
| 36 | public interface SurfaceHolder { |
| 37 | /** |
| 38 | * Surface type. |
| 39 | * |
| 40 | * @see #SURFACE_TYPE_NORMAL |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 41 | * @see #SURFACE_TYPE_PUSH_BUFFERS |
| 42 | */ |
| 43 | |
| 44 | /** Surface type: creates a regular surface, usually in main, non |
| 45 | * contiguous, cached/buffered RAM. */ |
| 46 | public static final int SURFACE_TYPE_NORMAL = MEMORY_TYPE_NORMAL; |
| 47 | /** Surface type: creates a suited to be used with DMA engines and |
Mathias Agopian | 317a628 | 2009-08-13 17:29:02 -0700 | [diff] [blame] | 48 | * hardware accelerators. |
| 49 | * @deprecated this is ignored, this value is set automatically when needed. |
| 50 | */ |
| 51 | @Deprecated |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 52 | public static final int SURFACE_TYPE_HARDWARE = MEMORY_TYPE_HARDWARE; |
Mathias Agopian | 317a628 | 2009-08-13 17:29:02 -0700 | [diff] [blame] | 53 | /** Surface type: creates a surface suited to be used with the GPU |
| 54 | * @deprecated this is ignored, this value is set automatically when needed. |
| 55 | */ |
| 56 | @Deprecated |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 57 | public static final int SURFACE_TYPE_GPU = MEMORY_TYPE_GPU; |
| 58 | /** Surface type: creates a "push" surface, that is a surface that |
| 59 | * doesn't owns its buffers. With such a surface lockCanvas will fail. */ |
| 60 | public static final int SURFACE_TYPE_PUSH_BUFFERS = MEMORY_TYPE_PUSH_BUFFERS; |
| 61 | |
| 62 | /** |
| 63 | * Exception that is thrown from {@link #lockCanvas} when called on a Surface |
| 64 | * whose is SURFACE_TYPE_PUSH_BUFFERS. |
| 65 | */ |
| 66 | public static class BadSurfaceTypeException extends RuntimeException { |
| 67 | public BadSurfaceTypeException() { |
| 68 | } |
| 69 | |
| 70 | public BadSurfaceTypeException(String name) { |
| 71 | super(name); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * A client may implement this interface to receive information about |
| 77 | * changes to the surface. When used with a {@link SurfaceView}, the |
| 78 | * Surface being held is only available between calls to |
| 79 | * {@link #surfaceCreated(SurfaceHolder)} and |
| 80 | * {@link #surfaceDestroyed(SurfaceHolder). The Callback is set with |
| 81 | * {@link SurfaceHolder#addCallback SurfaceHolder.addCallback} method. |
| 82 | */ |
| 83 | public interface Callback { |
| 84 | /** |
| 85 | * This is called immediately after the surface is first created. |
| 86 | * Implementations of this should start up whatever rendering code |
| 87 | * they desire. Note that only one thread can ever draw into |
| 88 | * a {@link Surface}, so you should not draw into the Surface here |
| 89 | * if your normal rendering will be in another thread. |
| 90 | * |
| 91 | * @param holder The SurfaceHolder whose surface is being created. |
| 92 | */ |
| 93 | public void surfaceCreated(SurfaceHolder holder); |
| 94 | |
| 95 | /** |
| 96 | * This is called immediately after any structural changes (format or |
| 97 | * size) have been made to the surface. You should at this point update |
| 98 | * the imagery in the surface. This method is always called at least |
| 99 | * once, after {@link #surfaceCreated}. |
| 100 | * |
| 101 | * @param holder The SurfaceHolder whose surface has changed. |
| 102 | * @param format The new PixelFormat of the surface. |
| 103 | * @param width The new width of the surface. |
| 104 | * @param height The new height of the surface. |
| 105 | */ |
| 106 | public void surfaceChanged(SurfaceHolder holder, int format, int width, |
| 107 | int height); |
| 108 | |
| 109 | /** |
| 110 | * This is called immediately before a surface is being destroyed. After |
| 111 | * returning from this call, you should no longer try to access this |
| 112 | * surface. If you have a rendering thread that directly accesses |
| 113 | * the surface, you must ensure that thread is no longer touching the |
| 114 | * Surface before returning from this function. |
| 115 | * |
| 116 | * @param holder The SurfaceHolder whose surface is being destroyed. |
| 117 | */ |
| 118 | public void surfaceDestroyed(SurfaceHolder holder); |
| 119 | } |
| 120 | |
| 121 | /** |
Dianne Hackborn | d76b67c | 2010-07-13 17:48:30 -0700 | [diff] [blame^] | 122 | * Additional callbacks that can be received for {@link Callback}. |
| 123 | */ |
| 124 | public interface Callback2 extends Callback { |
| 125 | /** |
| 126 | * Called when the application needs to redraw the content of its |
| 127 | * surface, after it is resized or for some other reason. By not |
| 128 | * returning here until the redraw is complete, you can ensure that |
| 129 | * the user will not see your surface in a bad state (at its new |
| 130 | * size before it has been correctly drawn that way). This will |
| 131 | * typically be preceeded by a call to {@link #surfaceChanged}. |
| 132 | * |
| 133 | * @param holder The SurfaceHolder whose surface has changed. |
| 134 | */ |
| 135 | public void surfaceRedrawNeeded(SurfaceHolder holder); |
| 136 | } |
| 137 | |
| 138 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 139 | * Add a Callback interface for this holder. There can several Callback |
| 140 | * interfaces associated to a holder. |
| 141 | * |
| 142 | * @param callback The new Callback interface. |
| 143 | */ |
| 144 | public void addCallback(Callback callback); |
| 145 | |
| 146 | /** |
| 147 | * Removes a previously added Callback interface from this holder. |
| 148 | * |
| 149 | * @param callback The Callback interface to remove. |
| 150 | */ |
| 151 | public void removeCallback(Callback callback); |
| 152 | |
| 153 | /** |
| 154 | * Use this method to find out if the surface is in the process of being |
| 155 | * created from Callback methods. This is intended to be used with |
| 156 | * {@link Callback#surfaceChanged}. |
| 157 | * |
| 158 | * @return true if the surface is in the process of being created. |
| 159 | */ |
| 160 | public boolean isCreating(); |
| 161 | |
| 162 | /** |
Mathias Agopian | 317a628 | 2009-08-13 17:29:02 -0700 | [diff] [blame] | 163 | * Sets the surface's type. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 164 | * |
| 165 | * @param type The surface's memory type. |
| 166 | */ |
| 167 | public void setType(int type); |
| 168 | |
| 169 | /** |
| 170 | * Make the surface a fixed size. It will never change from this size. |
| 171 | * When working with a {link SurfaceView}, this must be called from the |
| 172 | * same thread running the SurfaceView's window. |
| 173 | * |
| 174 | * @param width The surface's width. |
| 175 | * @param height The surface's height. |
| 176 | */ |
| 177 | public void setFixedSize(int width, int height); |
| 178 | |
| 179 | /** |
| 180 | * Allow the surface to resized based on layout of its container (this is |
| 181 | * the default). When this is enabled, you should monitor |
| 182 | * {@link Callback#surfaceChanged} for changes to the size of the surface. |
| 183 | * When working with a {link SurfaceView}, this must be called from the |
| 184 | * same thread running the SurfaceView's window. |
| 185 | */ |
| 186 | public void setSizeFromLayout(); |
| 187 | |
| 188 | /** |
| 189 | * Set the desired PixelFormat of the surface. The default is OPAQUE. |
| 190 | * When working with a {link SurfaceView}, this must be called from the |
| 191 | * same thread running the SurfaceView's window. |
| 192 | * |
| 193 | * @param format A constant from PixelFormat. |
| 194 | * |
| 195 | * @see android.graphics.PixelFormat |
| 196 | */ |
| 197 | public void setFormat(int format); |
| 198 | |
| 199 | /** |
| 200 | * Enable or disable option to keep the screen turned on while this |
| 201 | * surface is displayed. The default is false, allowing it to turn off. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 202 | * This is safe to call from any thread. |
| 203 | * |
| 204 | * @param screenOn Supply to true to force the screen to stay on, false |
| 205 | * to allow it to turn off. |
| 206 | */ |
| 207 | public void setKeepScreenOn(boolean screenOn); |
| 208 | |
| 209 | /** |
| 210 | * Start editing the pixels in the surface. The returned Canvas can be used |
| 211 | * to draw into the surface's bitmap. A null is returned if the surface has |
| 212 | * not been created or otherwise can not be edited. You will usually need |
| 213 | * to implement {@link Callback#surfaceCreated Callback.surfaceCreated} |
| 214 | * to find out when the Surface is available for use. |
| 215 | * |
| 216 | * <p>The content of the Surface is never preserved between unlockCanvas() and |
| 217 | * lockCanvas(), for this reason, every pixel within the Surface area |
| 218 | * must be written. The only exception to this rule is when a dirty |
| 219 | * rectangle is specified, in which case, non dirty pixels will be |
| 220 | * preserved. |
| 221 | * |
| 222 | * <p>If you call this repeatedly when the Surface is not ready (before |
| 223 | * {@link Callback#surfaceCreated Callback.surfaceCreated} or after |
| 224 | * {@link Callback#surfaceDestroyed Callback.surfaceDestroyed}), your calls |
| 225 | * will be throttled to a slow rate in order to avoid consuming CPU. |
| 226 | * |
| 227 | * <p>If null is not returned, this function internally holds a lock until |
| 228 | * the corresponding {@link #unlockCanvasAndPost} call, preventing |
| 229 | * {@link SurfaceView} from creating, destroying, or modifying the surface |
| 230 | * while it is being drawn. This can be more convenience than accessing |
| 231 | * the Surface directly, as you do not need to do special synchronization |
| 232 | * with a drawing thread in {@link Callback#surfaceDestroyed |
| 233 | * Callback.surfaceDestroyed}. |
| 234 | * |
| 235 | * @return Canvas Use to draw into the surface. |
| 236 | */ |
| 237 | public Canvas lockCanvas(); |
| 238 | |
| 239 | |
| 240 | /** |
| 241 | * Just like {@link #lockCanvas()} but allows to specify a dirty rectangle. |
| 242 | * Every |
| 243 | * pixel within that rectangle must be written; however pixels outside |
| 244 | * the dirty rectangle will be preserved by the next call to lockCanvas(). |
| 245 | * |
| 246 | * @see android.view.SurfaceHolder#lockCanvas |
| 247 | * |
| 248 | * @param dirty Area of the Surface that will be modified. |
| 249 | * @return Canvas Use to draw into the surface. |
| 250 | */ |
| 251 | public Canvas lockCanvas(Rect dirty); |
| 252 | |
| 253 | /** |
| 254 | * Finish editing pixels in the surface. After this call, the surface's |
| 255 | * current pixels will be shown on the screen, but its content is lost, |
| 256 | * in particular there is no guarantee that the content of the Surface |
| 257 | * will remain unchanged when lockCanvas() is called again. |
| 258 | * |
| 259 | * @see #lockCanvas() |
| 260 | * |
| 261 | * @param canvas The Canvas previously returned by lockCanvas(). |
| 262 | */ |
| 263 | public void unlockCanvasAndPost(Canvas canvas); |
| 264 | |
| 265 | /** |
| 266 | * Retrieve the current size of the surface. Note: do not modify the |
| 267 | * returned Rect. This is only safe to call from the thread of |
| 268 | * {@link SurfaceView}'s window, or while inside of |
| 269 | * {@link #lockCanvas()}. |
| 270 | * |
| 271 | * @return Rect The surface's dimensions. The left and top are always 0. |
| 272 | */ |
| 273 | public Rect getSurfaceFrame(); |
| 274 | |
| 275 | /** |
| 276 | * Direct access to the surface object. The Surface may not always be |
| 277 | * available -- for example when using a {@link SurfaceView} the holder's |
| 278 | * Surface is not created until the view has been attached to the window |
| 279 | * manager and performed a layout in order to determine the dimensions |
| 280 | * and screen position of the Surface. You will thus usually need |
| 281 | * to implement {@link Callback#surfaceCreated Callback.surfaceCreated} |
| 282 | * to find out when the Surface is available for use. |
| 283 | * |
| 284 | * <p>Note that if you directly access the Surface from another thread, |
| 285 | * it is critical that you correctly implement |
| 286 | * {@link Callback#surfaceCreated Callback.surfaceCreated} and |
| 287 | * {@link Callback#surfaceDestroyed Callback.surfaceDestroyed} to ensure |
| 288 | * that thread only accesses the Surface while it is valid, and that the |
| 289 | * Surface does not get destroyed while the thread is using it. |
| 290 | * |
| 291 | * <p>This method is intended to be used by frameworks which often need |
| 292 | * direct access to the Surface object (usually to pass it to native code). |
| 293 | * When designing APIs always use SurfaceHolder to pass surfaces around |
| 294 | * as opposed to the Surface object itself. A rule of thumb is that |
| 295 | * application code should never have to call this method. |
| 296 | * |
| 297 | * @return Surface The surface. |
| 298 | */ |
| 299 | public Surface getSurface(); |
| 300 | } |