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      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 <gui/SurfaceTexture.h>
     24 
     25 #include <pixelflinger/pixelflinger.h>
     26 #include <ui/GraphicBuffer.h>
     27 #include <ui/PixelFormat.h>
     28 
     29 #include <EGL/egl.h>
     30 #include <EGL/eglext.h>
     31 #include <GLES/gl.h>
     32 #include <GLES/glext.h>
     33 
     34 #include "LayerBase.h"
     35 #include "SurfaceTextureLayer.h"
     36 #include "Transform.h"
     37 
     38 namespace android {
     39 
     40 // ---------------------------------------------------------------------------
     41 
     42 class FreezeLock;
     43 class Client;
     44 class GLExtensions;
     45 
     46 // ---------------------------------------------------------------------------
     47 
     48 class Layer : public LayerBaseClient
     49 {
     50 public:
     51             Layer(SurfaceFlinger* flinger, DisplayID display,
     52                     const sp<Client>& client);
     53 
     54     virtual ~Layer();
     55 
     56     virtual const char* getTypeId() const { return "Layer"; }
     57 
     58     // the this layer's size and format
     59     status_t setBuffers(uint32_t w, uint32_t h,
     60             PixelFormat format, uint32_t flags=0);
     61 
     62     bool isFixedSize() const;
     63 
     64     // LayerBase interface
     65     virtual void setGeometry(hwc_layer_t* hwcl);
     66     virtual void setPerFrameData(hwc_layer_t* hwcl);
     67     virtual void onDraw(const Region& clip) const;
     68     virtual uint32_t doTransaction(uint32_t transactionFlags);
     69     virtual void lockPageFlip(bool& recomputeVisibleRegions);
     70     virtual void unlockPageFlip(const Transform& planeTransform, Region& outDirtyRegion);
     71     virtual bool isOpaque() const;
     72     virtual bool needsDithering() const     { return mNeedsDithering; }
     73     virtual bool isSecure() const           { return mSecure; }
     74     virtual bool isProtected() const;
     75     virtual void onRemoved();
     76     virtual sp<Layer> getLayer() const { return const_cast<Layer*>(this); }
     77     virtual void setName(const String8& name);
     78 
     79     // LayerBaseClient interface
     80     virtual wp<IBinder> getSurfaceTextureBinder() const;
     81 
     82     // only for debugging
     83     inline const sp<FreezeLock>&  getFreezeLock() const { return mFreezeLock; }
     84     inline const sp<GraphicBuffer>& getActiveBuffer() const { return mActiveBuffer; }
     85 
     86 protected:
     87     virtual void onFirstRef();
     88     virtual void dump(String8& result, char* scratch, size_t size) const;
     89 
     90 private:
     91     friend class SurfaceTextureLayer;
     92     void onFrameQueued();
     93     virtual sp<ISurface> createSurface();
     94     uint32_t getEffectiveUsage(uint32_t usage) const;
     95     uint32_t getTransformHint() const;
     96     bool isCropped() const;
     97     static bool getOpacityForFormat(uint32_t format);
     98 
     99     // -----------------------------------------------------------------------
    100 
    101     // constants
    102     sp<SurfaceTextureLayer> mSurfaceTexture;
    103     GLuint mTextureName;
    104 
    105     // thread-safe
    106     volatile int32_t mQueuedFrames;
    107 
    108     // main thread
    109     sp<GraphicBuffer> mActiveBuffer;
    110     GLfloat mTextureMatrix[16];
    111     Rect mCurrentCrop;
    112     uint32_t mCurrentTransform;
    113     uint32_t mCurrentScalingMode;
    114     bool mCurrentOpacity;
    115 
    116     // constants
    117     PixelFormat mFormat;
    118     const GLExtensions& mGLExtensions;
    119     bool mOpaqueLayer;
    120     bool mNeedsDithering;
    121 
    122     // page-flip thread (currently main thread)
    123     bool mSecure;         // no screenshots
    124     bool mProtectedByApp; // application requires protected path to external sink
    125     Region mPostedDirtyRegion;
    126 
    127     // page-flip thread and transaction thread (currently main thread)
    128     sp<FreezeLock>  mFreezeLock;
    129 
    130     // binder thread, transaction thread
    131     mutable Mutex mLock;
    132 };
    133 
    134 // ---------------------------------------------------------------------------
    135 
    136 }; // namespace android
    137 
    138 #endif // ANDROID_LAYER_H
    139