1 /* 2 * Copyright (C) 2017 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 #ifndef ANDROID_VNDK_NATIVEWINDOW_ANATIVEWINDOW_H 18 #define ANDROID_VNDK_NATIVEWINDOW_ANATIVEWINDOW_H 19 20 #include <nativebase/nativebase.h> 21 22 // vndk is a superset of the NDK 23 #include <android/native_window.h> 24 25 26 __BEGIN_DECLS 27 28 /* 29 * Convert this ANativeWindowBuffer into a AHardwareBuffer 30 */ 31 AHardwareBuffer* ANativeWindowBuffer_getHardwareBuffer(ANativeWindowBuffer* anwb); 32 33 /*****************************************************************************/ 34 35 /* 36 * Stores a value into one of the 4 available slots 37 * Retrieve the value with ANativeWindow_OemStorageGet() 38 * 39 * slot: 0 to 3 40 * 41 * Returns 0 on success or -errno on error. 42 */ 43 int ANativeWindow_OemStorageSet(ANativeWindow* window, uint32_t slot, intptr_t value); 44 45 46 /* 47 * Retrieves a value from one of the 4 available slots 48 * By default the returned value is 0 if it wasn't set by ANativeWindow_OemStorageSet() 49 * 50 * slot: 0 to 3 51 * 52 * Returns 0 on success or -errno on error. 53 */ 54 int ANativeWindow_OemStorageGet(ANativeWindow* window, uint32_t slot, intptr_t* value); 55 56 57 /* 58 * Set the swap interval for this surface. 59 * 60 * Returns 0 on success or -errno on error. 61 */ 62 int ANativeWindow_setSwapInterval(ANativeWindow* window, int interval); 63 64 65 /* 66 * queries that can be used with ANativeWindow_query() and ANativeWindow_queryf() 67 */ 68 enum ANativeWindowQuery { 69 /* The minimum number of buffers that must remain un-dequeued after a buffer 70 * has been queued. This value applies only if set_buffer_count was used to 71 * override the number of buffers and if a buffer has since been queued. 72 * Users of the set_buffer_count ANativeWindow method should query this 73 * value before calling set_buffer_count. If it is necessary to have N 74 * buffers simultaneously dequeued as part of the steady-state operation, 75 * and this query returns M then N+M buffers should be requested via 76 * native_window_set_buffer_count. 77 * 78 * Note that this value does NOT apply until a single buffer has been 79 * queued. In particular this means that it is possible to: 80 * 81 * 1. Query M = min undequeued buffers 82 * 2. Set the buffer count to N + M 83 * 3. Dequeue all N + M buffers 84 * 4. Cancel M buffers 85 * 5. Queue, dequeue, queue, dequeue, ad infinitum 86 */ 87 ANATIVEWINDOW_QUERY_MIN_UNDEQUEUED_BUFFERS = 3, 88 89 /* 90 * Default width of ANativeWindow buffers, these are the 91 * dimensions of the window buffers irrespective of the 92 * ANativeWindow_setBuffersDimensions() call and match the native window 93 * size. 94 */ 95 ANATIVEWINDOW_QUERY_DEFAULT_WIDTH = 6, 96 ANATIVEWINDOW_QUERY_DEFAULT_HEIGHT = 7, 97 98 /* 99 * transformation that will most-likely be applied to buffers. This is only 100 * a hint, the actual transformation applied might be different. 101 * 102 * INTENDED USE: 103 * 104 * The transform hint can be used by a producer, for instance the GLES 105 * driver, to pre-rotate the rendering such that the final transformation 106 * in the composer is identity. This can be very useful when used in 107 * conjunction with the h/w composer HAL, in situations where it 108 * cannot handle arbitrary rotations. 109 * 110 * 1. Before dequeuing a buffer, the GL driver (or any other ANW client) 111 * queries the ANW for NATIVE_WINDOW_TRANSFORM_HINT. 112 * 113 * 2. The GL driver overrides the width and height of the ANW to 114 * account for NATIVE_WINDOW_TRANSFORM_HINT. This is done by querying 115 * NATIVE_WINDOW_DEFAULT_{WIDTH | HEIGHT}, swapping the dimensions 116 * according to NATIVE_WINDOW_TRANSFORM_HINT and calling 117 * native_window_set_buffers_dimensions(). 118 * 119 * 3. The GL driver dequeues a buffer of the new pre-rotated size. 120 * 121 * 4. The GL driver renders to the buffer such that the image is 122 * already transformed, that is applying NATIVE_WINDOW_TRANSFORM_HINT 123 * to the rendering. 124 * 125 * 5. The GL driver calls native_window_set_transform to apply 126 * inverse transformation to the buffer it just rendered. 127 * In order to do this, the GL driver needs 128 * to calculate the inverse of NATIVE_WINDOW_TRANSFORM_HINT, this is 129 * done easily: 130 * 131 * int hintTransform, inverseTransform; 132 * query(..., NATIVE_WINDOW_TRANSFORM_HINT, &hintTransform); 133 * inverseTransform = hintTransform; 134 * if (hintTransform & HAL_TRANSFORM_ROT_90) 135 * inverseTransform ^= HAL_TRANSFORM_ROT_180; 136 * 137 * 138 * 6. The GL driver queues the pre-transformed buffer. 139 * 140 * 7. The composer combines the buffer transform with the display 141 * transform. If the buffer transform happens to cancel out the 142 * display transform then no rotation is needed. 143 * 144 */ 145 ANATIVEWINDOW_QUERY_TRANSFORM_HINT = 8, 146 147 /* 148 * Returns the age of the contents of the most recently dequeued buffer as 149 * the number of frames that have elapsed since it was last queued. For 150 * example, if the window is double-buffered, the age of any given buffer in 151 * steady state will be 2. If the dequeued buffer has never been queued, its 152 * age will be 0. 153 */ 154 ANATIVEWINDOW_QUERY_BUFFER_AGE = 13, 155 156 /* min swap interval supported by this compositor */ 157 ANATIVEWINDOW_QUERY_MIN_SWAP_INTERVAL = 0x10000, 158 159 /* max swap interval supported by this compositor */ 160 ANATIVEWINDOW_QUERY_MAX_SWAP_INTERVAL = 0x10001, 161 162 /* horizontal resolution in DPI. value is float, use queryf() */ 163 ANATIVEWINDOW_QUERY_XDPI = 0x10002, 164 165 /* vertical resolution in DPI. value is float, use queryf() */ 166 ANATIVEWINDOW_QUERY_YDPI = 0x10003, 167 }; 168 169 typedef enum ANativeWindowQuery ANativeWindowQuery; 170 171 /* 172 * hook used to retrieve information about the native window. 173 * 174 * Returns 0 on success or -errno on error. 175 */ 176 int ANativeWindow_query(const ANativeWindow* window, ANativeWindowQuery query, int* value); 177 int ANativeWindow_queryf(const ANativeWindow* window, ANativeWindowQuery query, float* value); 178 179 180 /* 181 * Hook called by EGL to acquire a buffer. This call may block if no 182 * buffers are available. 183 * 184 * The window holds a reference to the buffer between dequeueBuffer and 185 * either queueBuffer or cancelBuffer, so clients only need their own 186 * reference if they might use the buffer after queueing or canceling it. 187 * Holding a reference to a buffer after queueing or canceling it is only 188 * allowed if a specific buffer count has been set. 189 * 190 * The libsync fence file descriptor returned in the int pointed to by the 191 * fenceFd argument will refer to the fence that must signal before the 192 * dequeued buffer may be written to. A value of -1 indicates that the 193 * caller may access the buffer immediately without waiting on a fence. If 194 * a valid file descriptor is returned (i.e. any value except -1) then the 195 * caller is responsible for closing the file descriptor. 196 * 197 * Returns 0 on success or -errno on error. 198 */ 199 int ANativeWindow_dequeueBuffer(ANativeWindow* window, ANativeWindowBuffer** buffer, int* fenceFd); 200 201 202 /* 203 * Hook called by EGL when modifications to the render buffer are done. 204 * This unlocks and post the buffer. 205 * 206 * The window holds a reference to the buffer between dequeueBuffer and 207 * either queueBuffer or cancelBuffer, so clients only need their own 208 * reference if they might use the buffer after queueing or canceling it. 209 * Holding a reference to a buffer after queueing or canceling it is only 210 * allowed if a specific buffer count has been set. 211 * 212 * The fenceFd argument specifies a libsync fence file descriptor for a 213 * fence that must signal before the buffer can be accessed. If the buffer 214 * can be accessed immediately then a value of -1 should be used. The 215 * caller must not use the file descriptor after it is passed to 216 * queueBuffer, and the ANativeWindow implementation is responsible for 217 * closing it. 218 * 219 * Returns 0 on success or -errno on error. 220 */ 221 int ANativeWindow_queueBuffer(ANativeWindow* window, ANativeWindowBuffer* buffer, int fenceFd); 222 223 224 /* 225 * Hook used to cancel a buffer that has been dequeued. 226 * No synchronization is performed between dequeue() and cancel(), so 227 * either external synchronization is needed, or these functions must be 228 * called from the same thread. 229 * 230 * The window holds a reference to the buffer between dequeueBuffer and 231 * either queueBuffer or cancelBuffer, so clients only need their own 232 * reference if they might use the buffer after queueing or canceling it. 233 * Holding a reference to a buffer after queueing or canceling it is only 234 * allowed if a specific buffer count has been set. 235 * 236 * The fenceFd argument specifies a libsync fence file decsriptor for a 237 * fence that must signal before the buffer can be accessed. If the buffer 238 * can be accessed immediately then a value of -1 should be used. 239 * 240 * Note that if the client has not waited on the fence that was returned 241 * from dequeueBuffer, that same fence should be passed to cancelBuffer to 242 * ensure that future uses of the buffer are preceded by a wait on that 243 * fence. The caller must not use the file descriptor after it is passed 244 * to cancelBuffer, and the ANativeWindow implementation is responsible for 245 * closing it. 246 * 247 * Returns 0 on success or -errno on error. 248 */ 249 int ANativeWindow_cancelBuffer(ANativeWindow* window, ANativeWindowBuffer* buffer, int fenceFd); 250 251 /* 252 * Sets the intended usage flags for the next buffers. 253 * 254 * usage: one of AHARDWAREBUFFER_USAGE_* constant 255 * 256 * By default (if this function is never called), a usage of 257 * AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE | AHARDWAREBUFFER_USAGE_GPU_COLOR_OUTPUT 258 * is assumed. 259 * 260 * Calling this function will usually cause following buffers to be 261 * reallocated. 262 */ 263 int ANativeWindow_setUsage(ANativeWindow* window, uint64_t usage); 264 265 266 /* 267 * Sets the number of buffers associated with this native window. 268 */ 269 int ANativeWindow_setBufferCount(ANativeWindow* window, size_t bufferCount); 270 271 272 /* 273 * All buffers dequeued after this call will have the dimensions specified. 274 * In particular, all buffers will have a fixed-size, independent from the 275 * native-window size. They will be scaled according to the scaling mode 276 * (see native_window_set_scaling_mode) upon window composition. 277 * 278 * If w and h are 0, the normal behavior is restored. That is, dequeued buffers 279 * following this call will be sized to match the window's size. 280 * 281 * Calling this function will reset the window crop to a NULL value, which 282 * disables cropping of the buffers. 283 */ 284 int ANativeWindow_setBuffersDimensions(ANativeWindow* window, uint32_t w, uint32_t h); 285 286 287 /* 288 * All buffers dequeued after this call will have the format specified. 289 * format: one of AHARDWAREBUFFER_FORMAT_* constant 290 * 291 * If the specified format is 0, the default buffer format will be used. 292 */ 293 int ANativeWindow_setBuffersFormat(ANativeWindow* window, int format); 294 295 296 /* 297 * All buffers queued after this call will be associated with the timestamp in nanosecond 298 * parameter specified. If the timestamp is set to NATIVE_WINDOW_TIMESTAMP_AUTO 299 * (the default), timestamps will be generated automatically when queueBuffer is 300 * called. The timestamp is measured in nanoseconds, and is normally monotonically 301 * increasing. The timestamp should be unaffected by time-of-day adjustments, 302 * and for a camera should be strictly monotonic but for a media player may be 303 * reset when the position is set. 304 */ 305 int ANativeWindow_setBuffersTimestamp(ANativeWindow* window, int64_t timestamp); 306 307 308 /* 309 * Enable/disable shared buffer mode 310 */ 311 int ANativeWindow_setSharedBufferMode(ANativeWindow* window, bool sharedBufferMode); 312 313 314 /* 315 * Enable/disable auto refresh when in shared buffer mode 316 */ 317 int ANativeWindow_setAutoRefresh(ANativeWindow* window, bool autoRefresh); 318 319 320 /*****************************************************************************/ 321 322 __END_DECLS 323 324 #endif /* ANDROID_VNDK_NATIVEWINDOW_ANATIVEWINDOW_H */ 325