Layer.h revision 1681d95989271f3a9ac0dbb93d10e4a29f2b4444
1/* 2 * Copyright (C) 2007 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_LAYER_H 18#define ANDROID_LAYER_H 19 20#include <stdint.h> 21#include <sys/types.h> 22 23#include <EGL/egl.h> 24#include <EGL/eglext.h> 25 26#include <utils/RefBase.h> 27#include <utils/String8.h> 28#include <utils/Timers.h> 29 30#include <ui/FrameStats.h> 31#include <ui/GraphicBuffer.h> 32#include <ui/PixelFormat.h> 33#include <ui/Region.h> 34 35#include <gui/ISurfaceComposerClient.h> 36 37#include <private/gui/LayerState.h> 38 39#include "FrameTracker.h" 40#include "Client.h" 41#include "MonitoredProducer.h" 42#include "SurfaceFlinger.h" 43#include "SurfaceFlingerConsumer.h" 44#include "Transform.h" 45 46#include "DisplayHardware/HWComposer.h" 47#include "DisplayHardware/FloatRect.h" 48#include "RenderEngine/Mesh.h" 49#include "RenderEngine/Texture.h" 50 51namespace android { 52 53// --------------------------------------------------------------------------- 54 55class Client; 56class Colorizer; 57class DisplayDevice; 58class GraphicBuffer; 59class SurfaceFlinger; 60 61// --------------------------------------------------------------------------- 62 63/* 64 * A new BufferQueue and a new SurfaceFlingerConsumer are created when the 65 * Layer is first referenced. 66 * 67 * This also implements onFrameAvailable(), which notifies SurfaceFlinger 68 * that new data has arrived. 69 */ 70class Layer : public SurfaceFlingerConsumer::ContentsChangedListener { 71 static int32_t sSequence; 72 73public: 74 mutable bool contentDirty; 75 // regions below are in window-manager space 76 Region visibleRegion; 77 Region coveredRegion; 78 Region visibleNonTransparentRegion; 79 80 // Layer serial number. This gives layers an explicit ordering, so we 81 // have a stable sort order when their layer stack and Z-order are 82 // the same. 83 int32_t sequence; 84 85 enum { // flags for doTransaction() 86 eDontUpdateGeometryState = 0x00000001, 87 eVisibleRegion = 0x00000002, 88 }; 89 90 struct Geometry { 91 uint32_t w; 92 uint32_t h; 93 Rect crop; 94 inline bool operator ==(const Geometry& rhs) const { 95 return (w == rhs.w && h == rhs.h && crop == rhs.crop); 96 } 97 inline bool operator !=(const Geometry& rhs) const { 98 return !operator ==(rhs); 99 } 100 }; 101 102 struct State { 103 Geometry active; 104 Geometry requested; 105 uint32_t z; 106 uint32_t layerStack; 107 uint8_t alpha; 108 uint8_t flags; 109 uint8_t reserved[2]; 110 int32_t sequence; // changes when visible regions can change 111 Transform transform; 112 // the transparentRegion hint is a bit special, it's latched only 113 // when we receive a buffer -- this is because it's "content" 114 // dependent. 115 Region activeTransparentRegion; 116 Region requestedTransparentRegion; 117 }; 118 119 // ----------------------------------------------------------------------- 120 121 Layer(SurfaceFlinger* flinger, const sp<Client>& client, 122 const String8& name, uint32_t w, uint32_t h, uint32_t flags); 123 124 virtual ~Layer(); 125 126 // the this layer's size and format 127 status_t setBuffers(uint32_t w, uint32_t h, PixelFormat format, uint32_t flags); 128 129 // modify current state 130 bool setPosition(float x, float y); 131 bool setLayer(uint32_t z); 132 bool setSize(uint32_t w, uint32_t h); 133 bool setAlpha(uint8_t alpha); 134 bool setMatrix(const layer_state_t::matrix22_t& matrix); 135 bool setTransparentRegionHint(const Region& transparent); 136 bool setFlags(uint8_t flags, uint8_t mask); 137 bool setCrop(const Rect& crop); 138 bool setLayerStack(uint32_t layerStack); 139 140 uint32_t getTransactionFlags(uint32_t flags); 141 uint32_t setTransactionFlags(uint32_t flags); 142 143 void computeGeometry(const sp<const DisplayDevice>& hw, Mesh& mesh, 144 bool useIdentityTransform) const; 145 Rect computeBounds() const; 146 147 sp<IBinder> getHandle(); 148 sp<IGraphicBufferProducer> getProducer() const; 149 const String8& getName() const; 150 151 // ----------------------------------------------------------------------- 152 // Virtuals 153 154 virtual const char* getTypeId() const { return "Layer"; } 155 156 /* 157 * isOpaque - true if this surface is opaque 158 * 159 * This takes into account the buffer format (i.e. whether or not the 160 * pixel format includes an alpha channel) and the "opaque" flag set 161 * on the layer. It does not examine the current plane alpha value. 162 */ 163 virtual bool isOpaque(const Layer::State& s) const; 164 165 /* 166 * isSecure - true if this surface is secure, that is if it prevents 167 * screenshots or VNC servers. 168 */ 169 virtual bool isSecure() const { return mSecure; } 170 171 /* 172 * isProtected - true if the layer may contain protected content in the 173 * GRALLOC_USAGE_PROTECTED sense. 174 */ 175 virtual bool isProtected() const; 176 177 /* 178 * isVisible - true if this layer is visible, false otherwise 179 */ 180 virtual bool isVisible() const; 181 182 /* 183 * isFixedSize - true if content has a fixed size 184 */ 185 virtual bool isFixedSize() const; 186 187protected: 188 /* 189 * onDraw - draws the surface. 190 */ 191 virtual void onDraw(const sp<const DisplayDevice>& hw, const Region& clip, 192 bool useIdentityTransform) const; 193 194public: 195 // ----------------------------------------------------------------------- 196 197 void setGeometry(const sp<const DisplayDevice>& hw, 198 HWComposer::HWCLayerInterface& layer); 199 void setPerFrameData(const sp<const DisplayDevice>& hw, 200 HWComposer::HWCLayerInterface& layer); 201 void setAcquireFence(const sp<const DisplayDevice>& hw, 202 HWComposer::HWCLayerInterface& layer); 203 204 /* 205 * called after page-flip 206 */ 207 void onLayerDisplayed(const sp<const DisplayDevice>& hw, 208 HWComposer::HWCLayerInterface* layer); 209 210 /* 211 * called before composition. 212 * returns true if the layer has pending updates. 213 */ 214 bool onPreComposition(); 215 216 /* 217 * called after composition. 218 */ 219 void onPostComposition(); 220 221 /* 222 * draw - performs some global clipping optimizations 223 * and calls onDraw(). 224 */ 225 void draw(const sp<const DisplayDevice>& hw, const Region& clip) const; 226 void draw(const sp<const DisplayDevice>& hw, bool useIdentityTransform) const; 227 void draw(const sp<const DisplayDevice>& hw) const; 228 229 /* 230 * doTransaction - process the transaction. This is a good place to figure 231 * out which attributes of the surface have changed. 232 */ 233 uint32_t doTransaction(uint32_t transactionFlags); 234 235 /* 236 * setVisibleRegion - called to set the new visible region. This gives 237 * a chance to update the new visible region or record the fact it changed. 238 */ 239 void setVisibleRegion(const Region& visibleRegion); 240 241 /* 242 * setCoveredRegion - called when the covered region changes. The covered 243 * region corresponds to any area of the surface that is covered 244 * (transparently or not) by another surface. 245 */ 246 void setCoveredRegion(const Region& coveredRegion); 247 248 /* 249 * setVisibleNonTransparentRegion - called when the visible and 250 * non-transparent region changes. 251 */ 252 void setVisibleNonTransparentRegion(const Region& 253 visibleNonTransparentRegion); 254 255 /* 256 * latchBuffer - called each time the screen is redrawn and returns whether 257 * the visible regions need to be recomputed (this is a fairly heavy 258 * operation, so this should be set only if needed). Typically this is used 259 * to figure out if the content or size of a surface has changed. 260 */ 261 Region latchBuffer(bool& recomputeVisibleRegions); 262 263 /* 264 * called with the state lock when the surface is removed from the 265 * current list 266 */ 267 void onRemoved(); 268 269 270 // Updates the transform hint in our SurfaceFlingerConsumer to match 271 // the current orientation of the display device. 272 void updateTransformHint(const sp<const DisplayDevice>& hw) const; 273 274 /* 275 * returns the rectangle that crops the content of the layer and scales it 276 * to the layer's size. 277 */ 278 Rect getContentCrop() const; 279 280 // ----------------------------------------------------------------------- 281 282 void clearWithOpenGL(const sp<const DisplayDevice>& hw, const Region& clip) const; 283 void setFiltering(bool filtering); 284 bool getFiltering() const; 285 286 // only for debugging 287 inline const sp<GraphicBuffer>& getActiveBuffer() const { return mActiveBuffer; } 288 289 inline const State& getDrawingState() const { return mDrawingState; } 290 inline const State& getCurrentState() const { return mCurrentState; } 291 inline State& getCurrentState() { return mCurrentState; } 292 293 294 /* always call base class first */ 295 void dump(String8& result, Colorizer& colorizer) const; 296 void dumpFrameStats(String8& result) const; 297 void clearFrameStats(); 298 void logFrameStats(); 299 void getFrameStats(FrameStats* outStats) const; 300 301protected: 302 // constant 303 sp<SurfaceFlinger> mFlinger; 304 305 virtual void onFirstRef(); 306 307 /* 308 * Trivial class, used to ensure that mFlinger->onLayerDestroyed(mLayer) 309 * is called. 310 */ 311 class LayerCleaner { 312 sp<SurfaceFlinger> mFlinger; 313 wp<Layer> mLayer; 314 protected: 315 ~LayerCleaner(); 316 public: 317 LayerCleaner(const sp<SurfaceFlinger>& flinger, const sp<Layer>& layer); 318 }; 319 320 321private: 322 // Interface implementation for SurfaceFlingerConsumer::ContentsChangedListener 323 virtual void onFrameAvailable(); 324 virtual void onSidebandStreamChanged(); 325 326 void commitTransaction(); 327 328 // needsLinearFiltering - true if this surface's state requires filtering 329 bool needsFiltering(const sp<const DisplayDevice>& hw) const; 330 331 uint32_t getEffectiveUsage(uint32_t usage) const; 332 FloatRect computeCrop(const sp<const DisplayDevice>& hw) const; 333 bool isCropped() const; 334 static bool getOpacityForFormat(uint32_t format); 335 336 // drawing 337 void clearWithOpenGL(const sp<const DisplayDevice>& hw, const Region& clip, 338 float r, float g, float b, float alpha) const; 339 void drawWithOpenGL(const sp<const DisplayDevice>& hw, const Region& clip, 340 bool useIdentityTransform) const; 341 342 // Temporary - Used only for LEGACY camera mode. 343 uint32_t getProducerStickyTransform() const; 344 345 346 // ----------------------------------------------------------------------- 347 348 // constants 349 sp<SurfaceFlingerConsumer> mSurfaceFlingerConsumer; 350 sp<IGraphicBufferProducer> mProducer; 351 uint32_t mTextureName; // from GLES 352 bool mPremultipliedAlpha; 353 String8 mName; 354 mutable bool mDebug; 355 PixelFormat mFormat; 356 357 // these are protected by an external lock 358 State mCurrentState; 359 State mDrawingState; 360 volatile int32_t mTransactionFlags; 361 362 // thread-safe 363 volatile int32_t mQueuedFrames; 364 volatile int32_t mSidebandStreamChanged; // used like an atomic boolean 365 FrameTracker mFrameTracker; 366 367 // main thread 368 sp<GraphicBuffer> mActiveBuffer; 369 sp<NativeHandle> mSidebandStream; 370 Rect mCurrentCrop; 371 uint32_t mCurrentTransform; 372 uint32_t mCurrentScalingMode; 373 bool mCurrentOpacity; 374 bool mRefreshPending; 375 bool mFrameLatencyNeeded; 376 // Whether filtering is forced on or not 377 bool mFiltering; 378 // Whether filtering is needed b/c of the drawingstate 379 bool mNeedsFiltering; 380 // The mesh used to draw the layer in GLES composition mode 381 mutable Mesh mMesh; 382 // The texture used to draw the layer in GLES composition mode 383 mutable Texture mTexture; 384 385 // page-flip thread (currently main thread) 386 bool mSecure; // no screenshots 387 bool mProtectedByApp; // application requires protected path to external sink 388 389 // protected by mLock 390 mutable Mutex mLock; 391 // Set to true once we've returned this surface's handle 392 mutable bool mHasSurface; 393 const wp<Client> mClientRef; 394}; 395 396// --------------------------------------------------------------------------- 397 398}; // namespace android 399 400#endif // ANDROID_LAYER_H 401