services/surfaceflinger/DisplayDevice.h

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef ANDROID_DISPLAY_DEVICE_H
#define ANDROID_DISPLAY_DEVICE_H

#include <stdlib.h>

#include <ui/PixelFormat.h>
#include <ui/Region.h>

#include <EGL/egl.h>
#include <EGL/eglext.h>

#include <utils/Mutex.h>
#include <utils/Timers.h>

#include <hardware/hwcomposer_defs.h>

#include "Transform.h"

struct ANativeWindow;

namespace android {

class DisplayInfo;
class FramebufferSurface;
class LayerBase;
class SurfaceFlinger;
class HWComposer;

class DisplayDevice : public LightRefBase<DisplayDevice>
{
public:
    // region in layer-stack space
    mutable Region dirtyRegion;
    // region in screen space
    mutable Region swapRegion;
    // region in screen space
    Region undefinedRegion;

    enum DisplayType {
        DISPLAY_ID_INVALID = -1,
        DISPLAY_PRIMARY     = HWC_DISPLAY_PRIMARY,
        DISPLAY_EXTERNAL    = HWC_DISPLAY_EXTERNAL,
        NUM_DISPLAY_TYPES   = HWC_NUM_DISPLAY_TYPES,
        DISPLAY_VIRTUAL     = HWC_NUM_DISPLAY_TYPES
    };

    enum {
        PARTIAL_UPDATES = 0x00020000, // video driver feature
        SWAP_RECTANGLE  = 0x00080000,
    };

    DisplayDevice(
            const sp<SurfaceFlinger>& flinger,
            DisplayType type,
            bool isSecure,
            const wp<IBinder>& displayToken,
            const sp<ANativeWindow>& nativeWindow,
            const sp<FramebufferSurface>& framebufferSurface,
            EGLConfig config);

    ~DisplayDevice();

    // whether this is a valid object. An invalid DisplayDevice is returned
    // when an non existing id is requested
    bool isValid() const;

    // isSecure indicates whether this display can be trusted to display
    // secure surfaces.
    bool isSecure() const { return mIsSecure; }

    // Flip the front and back buffers if the back buffer is "dirty".  Might
    // be instantaneous, might involve copying the frame buffer around.
    void flip(const Region& dirty) const;

    int         getWidth() const;
    int         getHeight() const;
    PixelFormat getFormat() const;
    uint32_t    getFlags() const;

    EGLSurface  getEGLSurface() const;

    void                    setVisibleLayersSortedByZ(const Vector< sp<LayerBase> >& layers);
    const Vector< sp<LayerBase> >& getVisibleLayersSortedByZ() const;
    bool                    getSecureLayerVisible() const;
    Region                  getDirtyRegion(bool repaintEverything) const;

    void                    setLayerStack(uint32_t stack);
    void                    setProjection(int orientation, const Rect& viewport, const Rect& frame);

    int                     getOrientation() const { return mOrientation; }
    const Transform&        getTransform() const { return mGlobalTransform; }
    const Rect&             getViewport() const { return mViewport; }
    const Rect&             getFrame() const { return mFrame; }
    const Rect&             getScissor() const { return mScissor; }
    bool                    needsFiltering() const { return mNeedsFiltering; }

    uint32_t                getLayerStack() const { return mLayerStack; }
    int32_t                 getDisplayType() const { return mType; }
    int32_t                 getHwcDisplayId() const { return mHwcDisplayId; }
    const wp<IBinder>&      getDisplayToken() const { return mDisplayToken; }

    void swapBuffers(HWComposer& hwc) const;
    status_t compositionComplete() const;
    
    // called after h/w composer has completed its set() call
    void onSwapBuffersCompleted(HWComposer& hwc) const;

    Rect getBounds() const {
        return Rect(mDisplayWidth, mDisplayHeight);
    }
    inline Rect bounds() const { return getBounds(); }

    void setDisplayName(const String8& displayName);
    const String8& getDisplayName() const { return mDisplayName; }

    static EGLBoolean makeCurrent(EGLDisplay dpy,
            const sp<const DisplayDevice>& hw, EGLContext ctx);

    static void setViewportAndProjection(const sp<const DisplayDevice>& hw);

    /* ------------------------------------------------------------------------
     * blank / unblank management
     */
    void releaseScreen() const;
    void acquireScreen() const;
    bool isScreenAcquired() const;
    bool canDraw() const;

    /* ------------------------------------------------------------------------
     * Debugging
     */
    uint32_t getPageFlipCount() const;
    void dump(String8& result, char* buffer, size_t SIZE) const;

private:
    void init(EGLConfig config);

    /*
     *  Constants, set during initialization
     */
    sp<SurfaceFlinger> mFlinger;
    DisplayType mType;
    int32_t mHwcDisplayId;
    wp<IBinder> mDisplayToken;

    // ANativeWindow this display is rendering into
    sp<ANativeWindow> mNativeWindow;

    // set if mNativeWindow is a FramebufferSurface
    sp<FramebufferSurface> mFramebufferSurface;

    EGLDisplay      mDisplay;
    EGLSurface      mSurface;
    EGLContext      mContext;
    int             mDisplayWidth;
    int             mDisplayHeight;
    PixelFormat     mFormat;
    uint32_t        mFlags;
    mutable uint32_t mPageFlipCount;
    String8         mDisplayName;
    bool            mIsSecure;

    /*
     * Can only accessed from the main thread, these members
     * don't need synchronization.
     */

    // list of visible layers on that display
    Vector< sp<LayerBase> > mVisibleLayersSortedByZ;

    // Whether we have a visible secure layer on this display
    bool mSecureLayerVisible;

    // Whether the screen is blanked;
    mutable int mScreenAcquired;


    /*
     * Transaction state
     */
    static status_t orientationToTransfrom(int orientation,
            int w, int h, Transform* tr);

    void updateGeometryTransform();

    uint32_t mLayerStack;
    int mOrientation;
    // user-provided visible area of the layer stack
    Rect mViewport;
    // user-provided rectangle where mViewport gets mapped to
    Rect mFrame;
    // pre-computed scissor to apply to the display
    Rect mScissor;
    Transform mGlobalTransform;
    bool mNeedsFiltering;
};

}; // namespace android

#endif // ANDROID_DISPLAY_DEVICE_H