/*
* 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.
*/
package android.view;
import android.graphics.*;
import android.os.Parcelable;
import android.os.Parcel;
import android.util.Log;
/**
* Handle on to a raw buffer that is being managed by the screen compositor.
*/
public class Surface implements Parcelable {
private static final String LOG_TAG = "Surface";
/* flags used in constructor (keep in sync with ISurfaceComposer.h) */
/** Surface is created hidden */
public static final int HIDDEN = 0x00000004;
/** The surface is to be used by hardware accelerators or DMA engines */
public static final int HARDWARE = 0x00000010;
/** Implies "HARDWARE", the surface is to be used by the GPU
* additionally the backbuffer is never preserved for these
* surfaces. */
public static final int GPU = 0x00000028;
/** The surface contains secure content, special measures will
* be taken to disallow the surface's content to be copied from
* another process. In particular, screenshots and VNC servers will
* be disabled, but other measures can take place, for instance the
* surface might not be hardware accelerated. */
public static final int SECURE = 0x00000080;
/** Creates a surface where color components are interpreted as
* "non pre-multiplied" by their alpha channel. Of course this flag is
* meaningless for surfaces without an alpha channel. By default
* surfaces are pre-multiplied, which means that each color component is
* already multiplied by its alpha value. In this case the blending
* equation used is:
*
* DEST = SRC + DEST * (1-SRC_ALPHA)
*
* By contrast, non pre-multiplied surfaces use the following equation:
*
* DEST = SRC * SRC_ALPHA * DEST * (1-SRC_ALPHA)
*
* pre-multiplied surfaces must always be used if transparent pixels are
* composited on top of each-other into the surface. A pre-multiplied
* surface can never lower the value of the alpha component of a given
* pixel.
*
* In some rare situations, a non pre-multiplied surface is preferable.
*
*/
public static final int NON_PREMULTIPLIED = 0x00000100;
/**
* Creates a surface without a rendering buffer. Instead, the content
* of the surface must be pushed by an external entity. This is type
* of surface can be used for efficient camera preview or movie
* play back.
*/
public static final int PUSH_BUFFERS = 0x00000200;
/** Creates a normal surface. This is the default */
public static final int FX_SURFACE_NORMAL = 0x00000000;
/** Creates a Blur surface. Everything behind this surface is blurred
* by some amount. The quality and refresh speed of the blur effect
* is not settable or guaranteed.
* It is an error to lock a Blur surface, since it doesn't have
* a backing store.
*/
public static final int FX_SURFACE_BLUR = 0x00010000;
/** Creates a Dim surface. Everything behind this surface is dimmed
* by the amount specified in setAlpha().
* It is an error to lock a Dim surface, since it doesn't have
* a backing store.
*/
public static final int FX_SURFACE_DIM = 0x00020000;
/** Mask used for FX values above */
public static final int FX_SURFACE_MASK = 0x000F0000;
/* flags used with setFlags() (keep in sync with ISurfaceComposer.h) */
/** Hide the surface. Equivalent to calling hide() */
public static final int SURFACE_HIDDEN = 0x01;
/** Freeze the surface. Equivalent to calling freeze() */
public static final int SURACE_FROZEN = 0x02;
/** Enable dithering when compositing this surface */
public static final int SURFACE_DITHER = 0x04;
public static final int SURFACE_BLUR_FREEZE= 0x10;
/* orientations for setOrientation() */
public static final int ROTATION_0 = 0;
public static final int ROTATION_90 = 1;
public static final int ROTATION_180 = 2;
public static final int ROTATION_270 = 3;
/**
* Disable the orientation animation
* {@hide}
*/
public static final int FLAGS_ORIENTATION_ANIMATION_DISABLE = 0x000000001;
@SuppressWarnings("unused")
private int mSurface;
@SuppressWarnings("unused")
private int mSaveCount;
@SuppressWarnings("unused")
private Canvas mCanvas;
/**
* Exception thrown when a surface couldn't be created or resized
*/
public static class OutOfResourcesException extends Exception {
public OutOfResourcesException() {
}
public OutOfResourcesException(String name) {
super(name);
}
}
/*
* We use a class initializer to allow the native code to cache some
* field offsets.
*/
native private static void nativeClassInit();
static { nativeClassInit(); }
/**
* create a surface
* {@hide}
*/
public Surface(SurfaceSession s,
int pid, int display, int w, int h, int format, int flags)
throws OutOfResourcesException {
mCanvas = new Canvas();
init(s,pid,display,w,h,format,flags);
}
/**
* Create an empty surface, which will later be filled in by
* readFromParcel().
* {@hide}
*/
public Surface() {
mCanvas = new Canvas();
}
/**
* Copy another surface to this one. This surface now holds a reference
* to the same data as the original surface, and is -not- the owner.
* {@hide}
*/
public native void copyFrom(Surface o);
/**
* Does this object hold a valid surface? Returns true if it holds
* a physical surface, so lockCanvas() will succeed. Otherwise
* returns false.
*/
public native boolean isValid();
/** Call this free the surface up. {@hide} */
public native void clear();
/** draw into a surface */
public Canvas lockCanvas(Rect dirty) throws OutOfResourcesException {
/* the dirty rectangle may be expanded to the surface's size, if
* for instance it has been resized or if the bits were lost, since
* the last call.
*/
return lockCanvasNative(dirty);
}
private native Canvas lockCanvasNative(Rect dirty);
/** unlock the surface and asks a page flip */
public native void unlockCanvasAndPost(Canvas canvas);
/**
* unlock the surface. the screen won't be updated until
* post() or postAll() is called
*/
public native void unlockCanvas(Canvas canvas);
/** start/end a transaction {@hide} */
public static native void openTransaction();
/** {@hide} */
public static native void closeTransaction();
/**
* Freezes the specified display, No updating of the screen will occur
* until unfreezeDisplay() is called. Everything else works as usual though,
* in particular transactions.
* @param display
* {@hide}
*/
public static native void freezeDisplay(int display);
/**
* resume updating the specified display.
* @param display
* {@hide}
*/
public static native void unfreezeDisplay(int display);
/**
* set the orientation of the given display.
* @param display
* @param orientation
* @param flags
* {@hide}
*/
public static native void setOrientation(int display, int orientation, int flags);
/**
* set the orientation of the given display.
* @param display
* @param orientation
*/
public static void setOrientation(int display, int orientation) {
setOrientation(display, orientation, 0);
}
/**
* set surface parameters.
* needs to be inside open/closeTransaction block
*/
public native void setLayer(int zorder);
public native void setPosition(int x, int y);
public native void setSize(int w, int h);
public native void hide();
public native void show();
public native void setTransparentRegionHint(Region region);
public native void setAlpha(float alpha);
public native void setMatrix(float dsdx, float dtdx,
float dsdy, float dtdy);
public native void freeze();
public native void unfreeze();
public native void setFreezeTint(int tint);
public native void setFlags(int flags, int mask);
@Override
public String toString() {
return "Surface(native-token=" + mSurface + ")";
}
private Surface(Parcel source) throws OutOfResourcesException {
init(source);
}
public int describeContents() {
return 0;
}
public native void readFromParcel(Parcel source);
public native void writeToParcel(Parcel dest, int flags);
public static final Parcelable.Creator<Surface> CREATOR
= new Parcelable.Creator<Surface>()
{
public Surface createFromParcel(Parcel source) {
try {
return new Surface(source);
} catch (Exception e) {
Log.e(LOG_TAG, "Exception creating surface from parcel", e);
}
return null;
}
public Surface[] newArray(int size) {
return new Surface[size];
}
};
/* no user serviceable parts here ... */
@Override
protected void finalize() throws Throwable {
clear();
}
private native void init(SurfaceSession s,
int pid, int display, int w, int h, int format, int flags)
throws OutOfResourcesException;
private native void init(Parcel source);
}
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