HWComposer.h revision ef19414bd8b77a26f5751f3845be79025a8263fe 
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#ifndef ANDROID_SF_HWCOMPOSER_H
18#define ANDROID_SF_HWCOMPOSER_H
19
20#include <stdint.h>
21#include <sys/types.h>
22
23#include <EGL/egl.h>
24
25#include <hardware/hwcomposer_defs.h>
26
27#include <utils/StrongPointer.h>
28#include <utils/Vector.h>
29
30extern "C" int clock_nanosleep(clockid_t clock_id, int flags,
31                           const struct timespec *request,
32                           struct timespec *remain);
33
34struct hwc_composer_device_1;
35struct hwc_layer_list_1;
36struct hwc_procs;
37
38namespace android {
39// ---------------------------------------------------------------------------
40
41class String8;
42class SurfaceFlinger;
43class LayerBase;
44class GraphicBuffer;
45
46class HWComposer
47{
48public:
49    class EventHandler {
50        friend class HWComposer;
51        virtual void onVSyncReceived(int dpy, nsecs_t timestamp) = 0;
52    protected:
53        virtual ~EventHandler() {}
54    };
55
56    HWComposer(const sp<SurfaceFlinger>& flinger,
57            EventHandler& handler, nsecs_t refreshPeriod);
58    ~HWComposer();
59
60    status_t initCheck() const;
61
62    // tells the HAL what the framebuffer is
63    void setFrameBuffer(EGLDisplay dpy, EGLSurface sur);
64
65    // Asks the HAL what it can do
66    status_t prepare() const;
67
68    // disable hwc until next createWorkList
69    status_t disable();
70
71    // commits the list
72    status_t commit() const;
73
74    // release hardware resources
75    status_t release() const;
76
77    // create a work list for numLayers layer. sets HWC_GEOMETRY_CHANGED.
78    status_t createWorkList(size_t numLayers);
79
80    // get the layer array created by createWorkList()
81    size_t getNumLayers() const;
82
83    // get number of layers of the given type as updated in prepare().
84    // type is HWC_OVERLAY or HWC_FRAMEBUFFER
85    size_t getLayerCount(int type) const;
86
87    // needed forward declarations
88    class LayerListIterator;
89
90    /*
91     * Interface to hardware composer's layers functionality.
92     * This abstracts the HAL interface to layers which can evolve in
93     * incompatible ways from one release to another.
94     * The idea is that we could extend this interface as we add
95     * features to h/w composer.
96     */
97    class HWCLayerInterface {
98    protected:
99        virtual ~HWCLayerInterface() { }
100    public:
101        virtual int32_t getCompositionType() const = 0;
102        virtual uint32_t getHints() const = 0;
103        virtual int getAndResetReleaseFenceFd() = 0;
104        virtual void setDefaultState() = 0;
105        virtual void setSkip(bool skip) = 0;
106        virtual void setBlending(uint32_t blending) = 0;
107        virtual void setTransform(uint32_t transform) = 0;
108        virtual void setFrame(const Rect& frame) = 0;
109        virtual void setCrop(const Rect& crop) = 0;
110        virtual void setVisibleRegionScreen(const Region& reg) = 0;
111        virtual void setBuffer(const sp<GraphicBuffer>& buffer) = 0;
112    };
113
114    /*
115     * Interface used to implement an iterator to a list
116     * of HWCLayer.
117     */
118    class HWCLayer : public HWCLayerInterface {
119        friend class LayerListIterator;
120        // select the layer at the given index
121        virtual status_t setLayer(size_t index) = 0;
122        virtual HWCLayer* dup() = 0;
123        static HWCLayer* copy(HWCLayer *rhs) {
124            return rhs ? rhs->dup() : NULL;
125        }
126    protected:
127        virtual ~HWCLayer() { }
128    };
129
130    /*
131     * Iterator through a HWCLayer list.
132     * This behaves more or less like a forward iterator.
133     */
134    class LayerListIterator {
135        friend struct HWComposer;
136        HWCLayer* const mLayerList;
137        size_t mIndex;
138
139        LayerListIterator() : mLayerList(NULL), mIndex(0) { }
140
141        LayerListIterator(HWCLayer* layer, size_t index)
142            : mLayerList(layer), mIndex(index) { }
143
144        // we don't allow assignment, because we don't need it for now
145        LayerListIterator& operator = (const LayerListIterator& rhs);
146
147    public:
148        // copy operators
149        LayerListIterator(const LayerListIterator& rhs)
150            : mLayerList(HWCLayer::copy(rhs.mLayerList)), mIndex(rhs.mIndex) {
151        }
152
153        ~LayerListIterator() { delete mLayerList; }
154
155        // pre-increment
156        LayerListIterator& operator++() {
157            mLayerList->setLayer(++mIndex);
158            return *this;
159        }
160
161        // dereference
162        HWCLayerInterface& operator * () { return *mLayerList; }
163        HWCLayerInterface* operator -> () { return mLayerList; }
164
165        // comparison
166        bool operator == (const LayerListIterator& rhs) const {
167            return mIndex == rhs.mIndex;
168        }
169        bool operator != (const LayerListIterator& rhs) const {
170            return !operator==(rhs);
171        }
172    };
173
174    // Returns an iterator to the beginning of the layer list
175    LayerListIterator begin();
176
177    // Returns an iterator to the end of the layer list
178    LayerListIterator end();
179
180
181    // Events handling ---------------------------------------------------------
182
183    enum {
184        EVENT_VSYNC = HWC_EVENT_VSYNC
185    };
186
187    void eventControl(int event, int enabled);
188
189    // this class is only used to fake the VSync event on systems that don't
190    // have it.
191    class VSyncThread : public Thread {
192        HWComposer& mHwc;
193        mutable Mutex mLock;
194        Condition mCondition;
195        bool mEnabled;
196        mutable nsecs_t mNextFakeVSync;
197        nsecs_t mRefreshPeriod;
198        virtual void onFirstRef();
199        virtual bool threadLoop();
200    public:
201        VSyncThread(HWComposer& hwc);
202        void setEnabled(bool enabled);
203    };
204
205    friend class VSyncThread;
206
207    // for debugging ----------------------------------------------------------
208    void dump(String8& out, char* scratch, size_t SIZE,
209            const Vector< sp<LayerBase> >& visibleLayersSortedByZ) const;
210
211private:
212    LayerListIterator getLayerIterator(size_t index);
213
214    struct cb_context;
215
216    static void hook_invalidate(struct hwc_procs* procs);
217    static void hook_vsync(struct hwc_procs* procs, int dpy, int64_t timestamp);
218
219    inline void invalidate();
220    inline void vsync(int dpy, int64_t timestamp);
221
222    sp<SurfaceFlinger>              mFlinger;
223    hw_module_t const*              mModule;
224    struct hwc_composer_device_1*   mHwc;
225    struct hwc_layer_list_1*        mList;
226    size_t                          mCapacity;
227    mutable size_t                  mNumOVLayers;
228    mutable size_t                  mNumFBLayers;
229    EGLDisplay                      mDpy;
230    EGLSurface                      mSur;
231    cb_context*                     mCBContext;
232    EventHandler&                   mEventHandler;
233    nsecs_t                         mRefreshPeriod;
234    size_t                          mVSyncCount;
235    sp<VSyncThread>                 mVSyncThread;
236    bool                            mDebugForceFakeVSync;
237};
238
239// ---------------------------------------------------------------------------
240}; // namespace android
241
242#endif // ANDROID_SF_HWCOMPOSER_H
243